1 /*
2 * fs/nfs/nfs4proc.c
3 *
4 * Client-side procedure declarations for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56 #include <linux/freezer.h>
57 #include <linux/iversion.h>
58
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "sysfs.h"
67 #include "nfs4idmap.h"
68 #include "nfs4session.h"
69 #include "fscache.h"
70 #include "nfs42.h"
71
72 #include "nfs4trace.h"
73
74 #define NFSDBG_FACILITY NFSDBG_PROC
75
76 #define NFS4_BITMASK_SZ 3
77
78 #define NFS4_POLL_RETRY_MIN (HZ/10)
79 #define NFS4_POLL_RETRY_MAX (15*HZ)
80
81 /* file attributes which can be mapped to nfs attributes */
82 #define NFS4_VALID_ATTRS (ATTR_MODE \
83 | ATTR_UID \
84 | ATTR_GID \
85 | ATTR_SIZE \
86 | ATTR_ATIME \
87 | ATTR_MTIME \
88 | ATTR_CTIME \
89 | ATTR_ATIME_SET \
90 | ATTR_MTIME_SET)
91
92 struct nfs4_opendata;
93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
97 struct nfs_fattr *fattr, struct inode *inode);
98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
99 struct nfs_fattr *fattr, struct iattr *sattr,
100 struct nfs_open_context *ctx, struct nfs4_label *ilabel);
101 #ifdef CONFIG_NFS_V4_1
102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
103 const struct cred *cred,
104 struct nfs4_slot *slot,
105 bool is_privileged);
106 static int nfs41_test_stateid(struct nfs_server *, const nfs4_stateid *,
107 const struct cred *);
108 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
109 const struct cred *, bool);
110 #endif
111
112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
113 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
115 struct iattr *sattr, struct nfs4_label *label)
116 {
117 struct lsm_context shim;
118 int err;
119
120 if (label == NULL)
121 return NULL;
122
123 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
124 return NULL;
125
126 label->lfs = 0;
127 label->pi = 0;
128 label->len = 0;
129 label->label = NULL;
130
131 err = security_dentry_init_security(dentry, sattr->ia_mode,
132 &dentry->d_name, NULL, &shim);
133 if (err)
134 return NULL;
135
136 label->lsmid = shim.id;
137 label->label = shim.context;
138 label->len = shim.len;
139 return label;
140 }
141 static inline void
nfs4_label_release_security(struct nfs4_label * label)142 nfs4_label_release_security(struct nfs4_label *label)
143 {
144 struct lsm_context shim;
145
146 if (label) {
147 shim.context = label->label;
148 shim.len = label->len;
149 shim.id = label->lsmid;
150 security_release_secctx(&shim);
151 }
152 }
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)153 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
154 {
155 if (label)
156 return server->attr_bitmask;
157
158 return server->attr_bitmask_nl;
159 }
160 #else
161 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * l)162 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
163 struct iattr *sattr, struct nfs4_label *l)
164 { return NULL; }
165 static inline void
nfs4_label_release_security(struct nfs4_label * label)166 nfs4_label_release_security(struct nfs4_label *label)
167 { return; }
168 static inline u32 *
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)169 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
170 { return server->attr_bitmask; }
171 #endif
172
173 /* Prevent leaks of NFSv4 errors into userland */
nfs4_map_errors(int err)174 static int nfs4_map_errors(int err)
175 {
176 if (err >= -1000)
177 return err;
178 switch (err) {
179 case -NFS4ERR_RESOURCE:
180 case -NFS4ERR_LAYOUTTRYLATER:
181 case -NFS4ERR_RECALLCONFLICT:
182 case -NFS4ERR_RETURNCONFLICT:
183 return -EREMOTEIO;
184 case -NFS4ERR_WRONGSEC:
185 case -NFS4ERR_WRONG_CRED:
186 return -EPERM;
187 case -NFS4ERR_BADOWNER:
188 case -NFS4ERR_BADNAME:
189 return -EINVAL;
190 case -NFS4ERR_SHARE_DENIED:
191 return -EACCES;
192 case -NFS4ERR_MINOR_VERS_MISMATCH:
193 return -EPROTONOSUPPORT;
194 case -NFS4ERR_FILE_OPEN:
195 return -EBUSY;
196 case -NFS4ERR_NOT_SAME:
197 return -ENOTSYNC;
198 case -ENETDOWN:
199 case -ENETUNREACH:
200 break;
201 default:
202 dprintk("%s could not handle NFSv4 error %d\n",
203 __func__, -err);
204 break;
205 }
206 return -EIO;
207 }
208
209 /*
210 * This is our standard bitmap for GETATTR requests.
211 */
212 const u32 nfs4_fattr_bitmap[3] = {
213 FATTR4_WORD0_TYPE
214 | FATTR4_WORD0_CHANGE
215 | FATTR4_WORD0_SIZE
216 | FATTR4_WORD0_FSID
217 | FATTR4_WORD0_FILEID,
218 FATTR4_WORD1_MODE
219 | FATTR4_WORD1_NUMLINKS
220 | FATTR4_WORD1_OWNER
221 | FATTR4_WORD1_OWNER_GROUP
222 | FATTR4_WORD1_RAWDEV
223 | FATTR4_WORD1_SPACE_USED
224 | FATTR4_WORD1_TIME_ACCESS
225 | FATTR4_WORD1_TIME_CREATE
226 | FATTR4_WORD1_TIME_METADATA
227 | FATTR4_WORD1_TIME_MODIFY
228 | FATTR4_WORD1_MOUNTED_ON_FILEID,
229 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
230 FATTR4_WORD2_SECURITY_LABEL
231 #endif
232 };
233
234 static const u32 nfs4_pnfs_open_bitmap[3] = {
235 FATTR4_WORD0_TYPE
236 | FATTR4_WORD0_CHANGE
237 | FATTR4_WORD0_SIZE
238 | FATTR4_WORD0_FSID
239 | FATTR4_WORD0_FILEID,
240 FATTR4_WORD1_MODE
241 | FATTR4_WORD1_NUMLINKS
242 | FATTR4_WORD1_OWNER
243 | FATTR4_WORD1_OWNER_GROUP
244 | FATTR4_WORD1_RAWDEV
245 | FATTR4_WORD1_SPACE_USED
246 | FATTR4_WORD1_TIME_ACCESS
247 | FATTR4_WORD1_TIME_CREATE
248 | FATTR4_WORD1_TIME_METADATA
249 | FATTR4_WORD1_TIME_MODIFY,
250 FATTR4_WORD2_MDSTHRESHOLD
251 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
252 | FATTR4_WORD2_SECURITY_LABEL
253 #endif
254 };
255
256 static const u32 nfs4_open_noattr_bitmap[3] = {
257 FATTR4_WORD0_TYPE
258 | FATTR4_WORD0_FILEID,
259 };
260
261 const u32 nfs4_statfs_bitmap[3] = {
262 FATTR4_WORD0_FILES_AVAIL
263 | FATTR4_WORD0_FILES_FREE
264 | FATTR4_WORD0_FILES_TOTAL,
265 FATTR4_WORD1_SPACE_AVAIL
266 | FATTR4_WORD1_SPACE_FREE
267 | FATTR4_WORD1_SPACE_TOTAL
268 };
269
270 const u32 nfs4_pathconf_bitmap[3] = {
271 FATTR4_WORD0_MAXLINK
272 | FATTR4_WORD0_MAXNAME,
273 0
274 };
275
276 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
277 | FATTR4_WORD0_MAXREAD
278 | FATTR4_WORD0_MAXWRITE
279 | FATTR4_WORD0_LEASE_TIME,
280 FATTR4_WORD1_TIME_DELTA
281 | FATTR4_WORD1_FS_LAYOUT_TYPES,
282 FATTR4_WORD2_LAYOUT_BLKSIZE
283 | FATTR4_WORD2_CLONE_BLKSIZE
284 | FATTR4_WORD2_CHANGE_ATTR_TYPE
285 | FATTR4_WORD2_XATTR_SUPPORT
286 };
287
288 const u32 nfs4_fs_locations_bitmap[3] = {
289 FATTR4_WORD0_CHANGE
290 | FATTR4_WORD0_SIZE
291 | FATTR4_WORD0_FSID
292 | FATTR4_WORD0_FILEID
293 | FATTR4_WORD0_FS_LOCATIONS,
294 FATTR4_WORD1_OWNER
295 | FATTR4_WORD1_OWNER_GROUP
296 | FATTR4_WORD1_RAWDEV
297 | FATTR4_WORD1_SPACE_USED
298 | FATTR4_WORD1_TIME_ACCESS
299 | FATTR4_WORD1_TIME_METADATA
300 | FATTR4_WORD1_TIME_MODIFY
301 | FATTR4_WORD1_MOUNTED_ON_FILEID,
302 };
303
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)304 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
305 struct inode *inode, unsigned long flags)
306 {
307 unsigned long cache_validity;
308
309 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
310 if (!inode || !nfs_have_read_or_write_delegation(inode))
311 return;
312
313 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
314
315 /* Remove the attributes over which we have full control */
316 dst[1] &= ~FATTR4_WORD1_RAWDEV;
317 if (!(cache_validity & NFS_INO_INVALID_SIZE))
318 dst[0] &= ~FATTR4_WORD0_SIZE;
319
320 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
321 dst[0] &= ~FATTR4_WORD0_CHANGE;
322
323 if (!(cache_validity & NFS_INO_INVALID_MODE))
324 dst[1] &= ~FATTR4_WORD1_MODE;
325 if (!(cache_validity & NFS_INO_INVALID_OTHER))
326 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
327
328 if (!(cache_validity & NFS_INO_INVALID_BTIME))
329 dst[1] &= ~FATTR4_WORD1_TIME_CREATE;
330
331 if (nfs_have_delegated_mtime(inode)) {
332 if (!(cache_validity & NFS_INO_INVALID_ATIME))
333 dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
334 if (!(cache_validity & NFS_INO_INVALID_MTIME))
335 dst[1] &= ~(FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET);
336 if (!(cache_validity & NFS_INO_INVALID_CTIME))
337 dst[1] &= ~(FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY_SET);
338 } else if (nfs_have_delegated_atime(inode)) {
339 if (!(cache_validity & NFS_INO_INVALID_ATIME))
340 dst[1] &= ~(FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET);
341 }
342 }
343
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)344 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
345 struct nfs4_readdir_arg *readdir)
346 {
347 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
348 __be32 *start, *p;
349
350 if (cookie > 2) {
351 readdir->cookie = cookie;
352 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
353 return;
354 }
355
356 readdir->cookie = 0;
357 memset(&readdir->verifier, 0, sizeof(readdir->verifier));
358 if (cookie == 2)
359 return;
360
361 /*
362 * NFSv4 servers do not return entries for '.' and '..'
363 * Therefore, we fake these entries here. We let '.'
364 * have cookie 0 and '..' have cookie 1. Note that
365 * when talking to the server, we always send cookie 0
366 * instead of 1 or 2.
367 */
368 start = p = kmap_atomic(*readdir->pages);
369
370 if (cookie == 0) {
371 *p++ = xdr_one; /* next */
372 *p++ = xdr_zero; /* cookie, first word */
373 *p++ = xdr_one; /* cookie, second word */
374 *p++ = xdr_one; /* entry len */
375 memcpy(p, ".\0\0\0", 4); /* entry */
376 p++;
377 *p++ = xdr_one; /* bitmap length */
378 *p++ = htonl(attrs); /* bitmap */
379 *p++ = htonl(12); /* attribute buffer length */
380 *p++ = htonl(NF4DIR);
381 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
382 }
383
384 *p++ = xdr_one; /* next */
385 *p++ = xdr_zero; /* cookie, first word */
386 *p++ = xdr_two; /* cookie, second word */
387 *p++ = xdr_two; /* entry len */
388 memcpy(p, "..\0\0", 4); /* entry */
389 p++;
390 *p++ = xdr_one; /* bitmap length */
391 *p++ = htonl(attrs); /* bitmap */
392 *p++ = htonl(12); /* attribute buffer length */
393 *p++ = htonl(NF4DIR);
394 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
395
396 readdir->pgbase = (char *)p - (char *)start;
397 readdir->count -= readdir->pgbase;
398 kunmap_atomic(start);
399 }
400
nfs4_fattr_set_prechange(struct nfs_fattr * fattr,u64 version)401 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
402 {
403 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
404 fattr->pre_change_attr = version;
405 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
406 }
407 }
408
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)409 static void nfs4_test_and_free_stateid(struct nfs_server *server,
410 nfs4_stateid *stateid,
411 const struct cred *cred)
412 {
413 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
414
415 ops->test_and_free_expired(server, stateid, cred);
416 }
417
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)418 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
419 nfs4_stateid *stateid,
420 const struct cred *cred)
421 {
422 stateid->type = NFS4_REVOKED_STATEID_TYPE;
423 nfs4_test_and_free_stateid(server, stateid, cred);
424 }
425
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)426 static void nfs4_free_revoked_stateid(struct nfs_server *server,
427 const nfs4_stateid *stateid,
428 const struct cred *cred)
429 {
430 nfs4_stateid tmp;
431
432 nfs4_stateid_copy(&tmp, stateid);
433 __nfs4_free_revoked_stateid(server, &tmp, cred);
434 }
435
nfs4_update_delay(long * timeout)436 static long nfs4_update_delay(long *timeout)
437 {
438 long ret;
439 if (!timeout)
440 return NFS4_POLL_RETRY_MAX;
441 if (*timeout <= 0)
442 *timeout = NFS4_POLL_RETRY_MIN;
443 if (*timeout > NFS4_POLL_RETRY_MAX)
444 *timeout = NFS4_POLL_RETRY_MAX;
445 ret = *timeout;
446 *timeout <<= 1;
447 return ret;
448 }
449
nfs4_delay_killable(long * timeout)450 static int nfs4_delay_killable(long *timeout)
451 {
452 might_sleep();
453
454 if (unlikely(nfs_current_task_exiting()))
455 return -EINTR;
456 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
457 schedule_timeout(nfs4_update_delay(timeout));
458 if (!__fatal_signal_pending(current))
459 return 0;
460 return -EINTR;
461 }
462
nfs4_delay_interruptible(long * timeout)463 static int nfs4_delay_interruptible(long *timeout)
464 {
465 might_sleep();
466
467 if (unlikely(nfs_current_task_exiting()))
468 return -EINTR;
469 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
470 schedule_timeout(nfs4_update_delay(timeout));
471 if (!signal_pending(current))
472 return 0;
473 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
474 }
475
nfs4_delay(long * timeout,bool interruptible)476 static int nfs4_delay(long *timeout, bool interruptible)
477 {
478 if (interruptible)
479 return nfs4_delay_interruptible(timeout);
480 return nfs4_delay_killable(timeout);
481 }
482
483 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)484 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
485 {
486 if (!stateid)
487 return NULL;
488 switch (stateid->type) {
489 case NFS4_OPEN_STATEID_TYPE:
490 case NFS4_LOCK_STATEID_TYPE:
491 case NFS4_DELEGATION_STATEID_TYPE:
492 return stateid;
493 default:
494 break;
495 }
496 return NULL;
497 }
498
499 /* This is the error handling routine for processes that are allowed
500 * to sleep.
501 */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)502 static int nfs4_do_handle_exception(struct nfs_server *server,
503 int errorcode, struct nfs4_exception *exception)
504 {
505 struct nfs_client *clp = server->nfs_client;
506 struct nfs4_state *state = exception->state;
507 const nfs4_stateid *stateid;
508 struct inode *inode = exception->inode;
509 int ret = errorcode;
510
511 exception->delay = 0;
512 exception->recovering = 0;
513 exception->retry = 0;
514
515 stateid = nfs4_recoverable_stateid(exception->stateid);
516 if (stateid == NULL && state != NULL)
517 stateid = nfs4_recoverable_stateid(&state->stateid);
518
519 switch(errorcode) {
520 case 0:
521 return 0;
522 case -NFS4ERR_BADHANDLE:
523 case -ESTALE:
524 if (inode != NULL && S_ISREG(inode->i_mode))
525 pnfs_destroy_layout(NFS_I(inode));
526 break;
527 case -NFS4ERR_DELEG_REVOKED:
528 case -NFS4ERR_ADMIN_REVOKED:
529 case -NFS4ERR_EXPIRED:
530 case -NFS4ERR_BAD_STATEID:
531 case -NFS4ERR_PARTNER_NO_AUTH:
532 if (inode != NULL && stateid != NULL) {
533 nfs_inode_find_state_and_recover(inode,
534 stateid);
535 goto wait_on_recovery;
536 }
537 fallthrough;
538 case -NFS4ERR_OPENMODE:
539 if (inode) {
540 int err;
541
542 err = nfs_async_inode_return_delegation(inode,
543 stateid);
544 if (err == 0)
545 goto wait_on_recovery;
546 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
547 exception->retry = 1;
548 break;
549 }
550 }
551 if (state == NULL)
552 break;
553 ret = nfs4_schedule_stateid_recovery(server, state);
554 if (ret < 0)
555 break;
556 goto wait_on_recovery;
557 case -NFS4ERR_STALE_STATEID:
558 case -NFS4ERR_STALE_CLIENTID:
559 nfs4_schedule_lease_recovery(clp);
560 goto wait_on_recovery;
561 case -NFS4ERR_MOVED:
562 ret = nfs4_schedule_migration_recovery(server);
563 if (ret < 0)
564 break;
565 goto wait_on_recovery;
566 case -NFS4ERR_LEASE_MOVED:
567 nfs4_schedule_lease_moved_recovery(clp);
568 goto wait_on_recovery;
569 #if defined(CONFIG_NFS_V4_1)
570 case -NFS4ERR_BADSESSION:
571 case -NFS4ERR_BADSLOT:
572 case -NFS4ERR_BAD_HIGH_SLOT:
573 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
574 case -NFS4ERR_DEADSESSION:
575 case -NFS4ERR_SEQ_FALSE_RETRY:
576 case -NFS4ERR_SEQ_MISORDERED:
577 /* Handled in nfs41_sequence_process() */
578 goto wait_on_recovery;
579 #endif /* defined(CONFIG_NFS_V4_1) */
580 case -NFS4ERR_FILE_OPEN:
581 if (exception->timeout > HZ) {
582 /* We have retried a decent amount, time to
583 * fail
584 */
585 ret = -EBUSY;
586 break;
587 }
588 fallthrough;
589 case -NFS4ERR_DELAY:
590 nfs_inc_server_stats(server, NFSIOS_DELAY);
591 fallthrough;
592 case -NFS4ERR_GRACE:
593 case -NFS4ERR_LAYOUTTRYLATER:
594 case -NFS4ERR_RECALLCONFLICT:
595 case -NFS4ERR_RETURNCONFLICT:
596 exception->delay = 1;
597 return 0;
598
599 case -NFS4ERR_RETRY_UNCACHED_REP:
600 case -NFS4ERR_OLD_STATEID:
601 exception->retry = 1;
602 break;
603 case -NFS4ERR_BADOWNER:
604 /* The following works around a Linux server bug! */
605 case -NFS4ERR_BADNAME:
606 if (server->caps & NFS_CAP_UIDGID_NOMAP) {
607 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
608 exception->retry = 1;
609 printk(KERN_WARNING "NFS: v4 server %s "
610 "does not accept raw "
611 "uid/gids. "
612 "Reenabling the idmapper.\n",
613 server->nfs_client->cl_hostname);
614 }
615 }
616 /* We failed to handle the error */
617 return nfs4_map_errors(ret);
618 wait_on_recovery:
619 exception->recovering = 1;
620 return 0;
621 }
622
623 /*
624 * Track the number of NFS4ERR_DELAY related retransmissions and return
625 * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
626 * set by 'nfs_delay_retrans'.
627 */
nfs4_exception_should_retrans(const struct nfs_server * server,struct nfs4_exception * exception)628 static int nfs4_exception_should_retrans(const struct nfs_server *server,
629 struct nfs4_exception *exception)
630 {
631 if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
632 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
633 return -EAGAIN;
634 }
635 return 0;
636 }
637
638 /* This is the error handling routine for processes that are allowed
639 * to sleep.
640 */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)641 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
642 {
643 struct nfs_client *clp = server->nfs_client;
644 int ret;
645
646 ret = nfs4_do_handle_exception(server, errorcode, exception);
647 if (exception->delay) {
648 int ret2 = nfs4_exception_should_retrans(server, exception);
649 if (ret2 < 0) {
650 exception->retry = 0;
651 return ret2;
652 }
653 ret = nfs4_delay(&exception->timeout,
654 exception->interruptible);
655 goto out_retry;
656 }
657 if (exception->recovering) {
658 if (exception->task_is_privileged)
659 return -EDEADLOCK;
660 ret = nfs4_wait_clnt_recover(clp);
661 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
662 return -EIO;
663 goto out_retry;
664 }
665 return ret;
666 out_retry:
667 if (ret == 0)
668 exception->retry = 1;
669 return ret;
670 }
671
672 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)673 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
674 int errorcode, struct nfs4_exception *exception)
675 {
676 struct nfs_client *clp = server->nfs_client;
677 int ret;
678
679 if ((task->tk_rpc_status == -ENETDOWN ||
680 task->tk_rpc_status == -ENETUNREACH) &&
681 task->tk_flags & RPC_TASK_NETUNREACH_FATAL) {
682 exception->delay = 0;
683 exception->recovering = 0;
684 exception->retry = 0;
685 return -EIO;
686 }
687
688 ret = nfs4_do_handle_exception(server, errorcode, exception);
689 if (exception->delay) {
690 int ret2 = nfs4_exception_should_retrans(server, exception);
691 if (ret2 < 0) {
692 exception->retry = 0;
693 return ret2;
694 }
695 rpc_delay(task, nfs4_update_delay(&exception->timeout));
696 goto out_retry;
697 }
698 if (exception->recovering) {
699 if (exception->task_is_privileged)
700 return -EDEADLOCK;
701 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
702 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
703 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
704 goto out_retry;
705 }
706 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
707 ret = -EIO;
708 return ret;
709 out_retry:
710 if (ret == 0) {
711 exception->retry = 1;
712 /*
713 * For NFS4ERR_MOVED, the client transport will need to
714 * be recomputed after migration recovery has completed.
715 */
716 if (errorcode == -NFS4ERR_MOVED)
717 rpc_task_release_transport(task);
718 }
719 return ret;
720 }
721
722 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)723 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
724 struct nfs4_state *state, long *timeout)
725 {
726 struct nfs4_exception exception = {
727 .state = state,
728 };
729
730 if (task->tk_status >= 0)
731 return 0;
732 if (timeout)
733 exception.timeout = *timeout;
734 task->tk_status = nfs4_async_handle_exception(task, server,
735 task->tk_status,
736 &exception);
737 if (exception.delay && timeout)
738 *timeout = exception.timeout;
739 if (exception.retry)
740 return -EAGAIN;
741 return 0;
742 }
743
744 /*
745 * Return 'true' if 'clp' is using an rpc_client that is integrity protected
746 * or 'false' otherwise.
747 */
_nfs4_is_integrity_protected(struct nfs_client * clp)748 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
749 {
750 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
751 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
752 }
753
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)754 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
755 {
756 spin_lock(&clp->cl_lock);
757 if (time_before(clp->cl_last_renewal,timestamp))
758 clp->cl_last_renewal = timestamp;
759 spin_unlock(&clp->cl_lock);
760 }
761
renew_lease(const struct nfs_server * server,unsigned long timestamp)762 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
763 {
764 struct nfs_client *clp = server->nfs_client;
765
766 if (!nfs4_has_session(clp))
767 do_renew_lease(clp, timestamp);
768 }
769
770 struct nfs4_call_sync_data {
771 const struct nfs_server *seq_server;
772 struct nfs4_sequence_args *seq_args;
773 struct nfs4_sequence_res *seq_res;
774 };
775
nfs4_init_sequence(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)776 void nfs4_init_sequence(struct nfs4_sequence_args *args,
777 struct nfs4_sequence_res *res, int cache_reply,
778 int privileged)
779 {
780 args->sa_slot = NULL;
781 args->sa_cache_this = cache_reply;
782 args->sa_privileged = privileged;
783
784 res->sr_slot = NULL;
785 }
786
nfs40_sequence_free_slot(struct nfs4_sequence_res * res)787 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
788 {
789 struct nfs4_slot *slot = res->sr_slot;
790 struct nfs4_slot_table *tbl;
791
792 tbl = slot->table;
793 spin_lock(&tbl->slot_tbl_lock);
794 if (!nfs41_wake_and_assign_slot(tbl, slot))
795 nfs4_free_slot(tbl, slot);
796 spin_unlock(&tbl->slot_tbl_lock);
797
798 res->sr_slot = NULL;
799 }
800
nfs40_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)801 static int nfs40_sequence_done(struct rpc_task *task,
802 struct nfs4_sequence_res *res)
803 {
804 if (res->sr_slot != NULL)
805 nfs40_sequence_free_slot(res);
806 return 1;
807 }
808
809 #if defined(CONFIG_NFS_V4_1)
810
nfs41_release_slot(struct nfs4_slot * slot)811 static void nfs41_release_slot(struct nfs4_slot *slot)
812 {
813 struct nfs4_session *session;
814 struct nfs4_slot_table *tbl;
815 bool send_new_highest_used_slotid = false;
816
817 if (!slot)
818 return;
819 tbl = slot->table;
820 session = tbl->session;
821
822 /* Bump the slot sequence number */
823 if (slot->seq_done)
824 slot->seq_nr++;
825 slot->seq_done = 0;
826
827 spin_lock(&tbl->slot_tbl_lock);
828 /* Be nice to the server: try to ensure that the last transmitted
829 * value for highest_user_slotid <= target_highest_slotid
830 */
831 if (tbl->highest_used_slotid > tbl->target_highest_slotid)
832 send_new_highest_used_slotid = true;
833
834 if (nfs41_wake_and_assign_slot(tbl, slot)) {
835 send_new_highest_used_slotid = false;
836 goto out_unlock;
837 }
838 nfs4_free_slot(tbl, slot);
839
840 if (tbl->highest_used_slotid != NFS4_NO_SLOT)
841 send_new_highest_used_slotid = false;
842 out_unlock:
843 spin_unlock(&tbl->slot_tbl_lock);
844 if (send_new_highest_used_slotid)
845 nfs41_notify_server(session->clp);
846 if (waitqueue_active(&tbl->slot_waitq))
847 wake_up_all(&tbl->slot_waitq);
848 }
849
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)850 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
851 {
852 nfs41_release_slot(res->sr_slot);
853 res->sr_slot = NULL;
854 }
855
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)856 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
857 u32 seqnr)
858 {
859 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
860 slot->seq_nr_highest_sent = seqnr;
861 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)862 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
863 {
864 nfs4_slot_sequence_record_sent(slot, seqnr);
865 slot->seq_nr_last_acked = seqnr;
866 }
867
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)868 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
869 struct nfs4_slot *slot)
870 {
871 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
872 if (!IS_ERR(task))
873 rpc_put_task_async(task);
874 }
875
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)876 static int nfs41_sequence_process(struct rpc_task *task,
877 struct nfs4_sequence_res *res)
878 {
879 struct nfs4_session *session;
880 struct nfs4_slot *slot = res->sr_slot;
881 struct nfs_client *clp;
882 int status;
883 int ret = 1;
884
885 if (slot == NULL)
886 goto out_noaction;
887 /* don't increment the sequence number if the task wasn't sent */
888 if (!RPC_WAS_SENT(task) || slot->seq_done)
889 goto out;
890
891 session = slot->table->session;
892 clp = session->clp;
893
894 trace_nfs4_sequence_done(session, res);
895
896 status = res->sr_status;
897 if (task->tk_status == -NFS4ERR_DEADSESSION)
898 status = -NFS4ERR_DEADSESSION;
899
900 /* Check the SEQUENCE operation status */
901 switch (status) {
902 case 0:
903 /* Mark this sequence number as having been acked */
904 nfs4_slot_sequence_acked(slot, slot->seq_nr);
905 /* Update the slot's sequence and clientid lease timer */
906 slot->seq_done = 1;
907 do_renew_lease(clp, res->sr_timestamp);
908 /* Check sequence flags */
909 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
910 !!slot->privileged);
911 nfs41_update_target_slotid(slot->table, slot, res);
912 break;
913 case 1:
914 /*
915 * sr_status remains 1 if an RPC level error occurred.
916 * The server may or may not have processed the sequence
917 * operation..
918 */
919 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
920 slot->seq_done = 1;
921 goto out;
922 case -NFS4ERR_DELAY:
923 /* The server detected a resend of the RPC call and
924 * returned NFS4ERR_DELAY as per Section 2.10.6.2
925 * of RFC5661.
926 */
927 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
928 __func__,
929 slot->slot_nr,
930 slot->seq_nr);
931 goto out_retry;
932 case -NFS4ERR_RETRY_UNCACHED_REP:
933 case -NFS4ERR_SEQ_FALSE_RETRY:
934 /*
935 * The server thinks we tried to replay a request.
936 * Retry the call after bumping the sequence ID.
937 */
938 nfs4_slot_sequence_acked(slot, slot->seq_nr);
939 goto retry_new_seq;
940 case -NFS4ERR_BADSLOT:
941 /*
942 * The slot id we used was probably retired. Try again
943 * using a different slot id.
944 */
945 if (slot->slot_nr < slot->table->target_highest_slotid)
946 goto session_recover;
947 goto retry_nowait;
948 case -NFS4ERR_SEQ_MISORDERED:
949 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
950 /*
951 * Were one or more calls using this slot interrupted?
952 * If the server never received the request, then our
953 * transmitted slot sequence number may be too high. However,
954 * if the server did receive the request then it might
955 * accidentally give us a reply with a mismatched operation.
956 * We can sort this out by sending a lone sequence operation
957 * to the server on the same slot.
958 */
959 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
960 slot->seq_nr--;
961 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
962 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
963 res->sr_slot = NULL;
964 }
965 goto retry_nowait;
966 }
967 /*
968 * RFC5661:
969 * A retry might be sent while the original request is
970 * still in progress on the replier. The replier SHOULD
971 * deal with the issue by returning NFS4ERR_DELAY as the
972 * reply to SEQUENCE or CB_SEQUENCE operation, but
973 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
974 *
975 * Restart the search after a delay.
976 */
977 slot->seq_nr = slot->seq_nr_highest_sent;
978 goto out_retry;
979 case -NFS4ERR_BADSESSION:
980 case -NFS4ERR_DEADSESSION:
981 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
982 goto session_recover;
983 default:
984 /* Just update the slot sequence no. */
985 slot->seq_done = 1;
986 }
987 out:
988 /* The session may be reset by one of the error handlers. */
989 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
990 out_noaction:
991 return ret;
992 session_recover:
993 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
994 nfs4_schedule_session_recovery(session, status);
995 dprintk("%s ERROR: %d Reset session\n", __func__, status);
996 nfs41_sequence_free_slot(res);
997 goto out;
998 retry_new_seq:
999 ++slot->seq_nr;
1000 retry_nowait:
1001 if (rpc_restart_call_prepare(task)) {
1002 nfs41_sequence_free_slot(res);
1003 task->tk_status = 0;
1004 ret = 0;
1005 }
1006 goto out;
1007 out_retry:
1008 if (!rpc_restart_call(task))
1009 goto out;
1010 rpc_delay(task, NFS4_POLL_RETRY_MAX);
1011 return 0;
1012 }
1013
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1014 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1015 {
1016 if (!nfs41_sequence_process(task, res))
1017 return 0;
1018 if (res->sr_slot != NULL)
1019 nfs41_sequence_free_slot(res);
1020 return 1;
1021
1022 }
1023 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
1024
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1025 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1026 {
1027 if (res->sr_slot == NULL)
1028 return 1;
1029 if (res->sr_slot->table->session != NULL)
1030 return nfs41_sequence_process(task, res);
1031 return nfs40_sequence_done(task, res);
1032 }
1033
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1034 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1035 {
1036 if (res->sr_slot != NULL) {
1037 if (res->sr_slot->table->session != NULL)
1038 nfs41_sequence_free_slot(res);
1039 else
1040 nfs40_sequence_free_slot(res);
1041 }
1042 }
1043
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1044 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1045 {
1046 if (res->sr_slot == NULL)
1047 return 1;
1048 if (!res->sr_slot->table->session)
1049 return nfs40_sequence_done(task, res);
1050 return nfs41_sequence_done(task, res);
1051 }
1052 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1053
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)1054 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1055 {
1056 struct nfs4_call_sync_data *data = calldata;
1057
1058 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1059
1060 nfs4_setup_sequence(data->seq_server->nfs_client,
1061 data->seq_args, data->seq_res, task);
1062 }
1063
nfs41_call_sync_done(struct rpc_task * task,void * calldata)1064 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1065 {
1066 struct nfs4_call_sync_data *data = calldata;
1067
1068 nfs41_sequence_done(task, data->seq_res);
1069 }
1070
1071 static const struct rpc_call_ops nfs41_call_sync_ops = {
1072 .rpc_call_prepare = nfs41_call_sync_prepare,
1073 .rpc_call_done = nfs41_call_sync_done,
1074 };
1075
1076 #else /* !CONFIG_NFS_V4_1 */
1077
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1078 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1079 {
1080 return nfs40_sequence_done(task, res);
1081 }
1082
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1083 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1084 {
1085 if (res->sr_slot != NULL)
1086 nfs40_sequence_free_slot(res);
1087 }
1088
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1089 int nfs4_sequence_done(struct rpc_task *task,
1090 struct nfs4_sequence_res *res)
1091 {
1092 return nfs40_sequence_done(task, res);
1093 }
1094 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1095
1096 #endif /* !CONFIG_NFS_V4_1 */
1097
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1098 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1099 {
1100 res->sr_timestamp = jiffies;
1101 res->sr_status_flags = 0;
1102 res->sr_status = 1;
1103 }
1104
1105 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1106 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1107 struct nfs4_sequence_res *res,
1108 struct nfs4_slot *slot)
1109 {
1110 if (!slot)
1111 return;
1112 slot->privileged = args->sa_privileged ? 1 : 0;
1113 args->sa_slot = slot;
1114
1115 res->sr_slot = slot;
1116 }
1117
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1118 int nfs4_setup_sequence(struct nfs_client *client,
1119 struct nfs4_sequence_args *args,
1120 struct nfs4_sequence_res *res,
1121 struct rpc_task *task)
1122 {
1123 struct nfs4_session *session = nfs4_get_session(client);
1124 struct nfs4_slot_table *tbl = client->cl_slot_tbl;
1125 struct nfs4_slot *slot;
1126
1127 /* slot already allocated? */
1128 if (res->sr_slot != NULL)
1129 goto out_start;
1130
1131 if (session)
1132 tbl = &session->fc_slot_table;
1133
1134 spin_lock(&tbl->slot_tbl_lock);
1135 /* The state manager will wait until the slot table is empty */
1136 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1137 goto out_sleep;
1138
1139 slot = nfs4_alloc_slot(tbl);
1140 if (IS_ERR(slot)) {
1141 if (slot == ERR_PTR(-ENOMEM))
1142 goto out_sleep_timeout;
1143 goto out_sleep;
1144 }
1145 spin_unlock(&tbl->slot_tbl_lock);
1146
1147 nfs4_sequence_attach_slot(args, res, slot);
1148
1149 trace_nfs4_setup_sequence(session, args);
1150 out_start:
1151 nfs41_sequence_res_init(res);
1152 rpc_call_start(task);
1153 return 0;
1154 out_sleep_timeout:
1155 /* Try again in 1/4 second */
1156 if (args->sa_privileged)
1157 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1158 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1159 else
1160 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1161 NULL, jiffies + (HZ >> 2));
1162 spin_unlock(&tbl->slot_tbl_lock);
1163 return -EAGAIN;
1164 out_sleep:
1165 if (args->sa_privileged)
1166 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1167 RPC_PRIORITY_PRIVILEGED);
1168 else
1169 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1170 spin_unlock(&tbl->slot_tbl_lock);
1171 return -EAGAIN;
1172 }
1173 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1174
nfs40_call_sync_prepare(struct rpc_task * task,void * calldata)1175 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1176 {
1177 struct nfs4_call_sync_data *data = calldata;
1178 nfs4_setup_sequence(data->seq_server->nfs_client,
1179 data->seq_args, data->seq_res, task);
1180 }
1181
nfs40_call_sync_done(struct rpc_task * task,void * calldata)1182 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1183 {
1184 struct nfs4_call_sync_data *data = calldata;
1185 nfs4_sequence_done(task, data->seq_res);
1186 }
1187
1188 static const struct rpc_call_ops nfs40_call_sync_ops = {
1189 .rpc_call_prepare = nfs40_call_sync_prepare,
1190 .rpc_call_done = nfs40_call_sync_done,
1191 };
1192
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1193 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1194 {
1195 int ret;
1196 struct rpc_task *task;
1197
1198 task = rpc_run_task(task_setup);
1199 if (IS_ERR(task))
1200 return PTR_ERR(task);
1201
1202 ret = task->tk_status;
1203 rpc_put_task(task);
1204 return ret;
1205 }
1206
nfs4_do_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,unsigned short task_flags)1207 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1208 struct nfs_server *server,
1209 struct rpc_message *msg,
1210 struct nfs4_sequence_args *args,
1211 struct nfs4_sequence_res *res,
1212 unsigned short task_flags)
1213 {
1214 struct nfs_client *clp = server->nfs_client;
1215 struct nfs4_call_sync_data data = {
1216 .seq_server = server,
1217 .seq_args = args,
1218 .seq_res = res,
1219 };
1220 struct rpc_task_setup task_setup = {
1221 .rpc_client = clnt,
1222 .rpc_message = msg,
1223 .callback_ops = clp->cl_mvops->call_sync_ops,
1224 .callback_data = &data,
1225 .flags = task_flags,
1226 };
1227
1228 return nfs4_call_sync_custom(&task_setup);
1229 }
1230
nfs4_call_sync_sequence(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res)1231 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1232 struct nfs_server *server,
1233 struct rpc_message *msg,
1234 struct nfs4_sequence_args *args,
1235 struct nfs4_sequence_res *res)
1236 {
1237 unsigned short task_flags = 0;
1238
1239 if (server->caps & NFS_CAP_MOVEABLE)
1240 task_flags = RPC_TASK_MOVEABLE;
1241 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1242 }
1243
1244
nfs4_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply)1245 int nfs4_call_sync(struct rpc_clnt *clnt,
1246 struct nfs_server *server,
1247 struct rpc_message *msg,
1248 struct nfs4_sequence_args *args,
1249 struct nfs4_sequence_res *res,
1250 int cache_reply)
1251 {
1252 nfs4_init_sequence(args, res, cache_reply, 0);
1253 return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1254 }
1255
1256 static void
nfs4_inc_nlink_locked(struct inode * inode)1257 nfs4_inc_nlink_locked(struct inode *inode)
1258 {
1259 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1260 NFS_INO_INVALID_CTIME |
1261 NFS_INO_INVALID_NLINK);
1262 inc_nlink(inode);
1263 }
1264
1265 static void
nfs4_inc_nlink(struct inode * inode)1266 nfs4_inc_nlink(struct inode *inode)
1267 {
1268 spin_lock(&inode->i_lock);
1269 nfs4_inc_nlink_locked(inode);
1270 spin_unlock(&inode->i_lock);
1271 }
1272
1273 static void
nfs4_dec_nlink_locked(struct inode * inode)1274 nfs4_dec_nlink_locked(struct inode *inode)
1275 {
1276 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1277 NFS_INO_INVALID_CTIME |
1278 NFS_INO_INVALID_NLINK);
1279 drop_nlink(inode);
1280 }
1281
1282 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1283 nfs4_update_changeattr_locked(struct inode *inode,
1284 struct nfs4_change_info *cinfo,
1285 unsigned long timestamp, unsigned long cache_validity)
1286 {
1287 struct nfs_inode *nfsi = NFS_I(inode);
1288 u64 change_attr = inode_peek_iversion_raw(inode);
1289
1290 if (!nfs_have_delegated_mtime(inode))
1291 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1292 if (S_ISDIR(inode->i_mode))
1293 cache_validity |= NFS_INO_INVALID_DATA;
1294
1295 switch (NFS_SERVER(inode)->change_attr_type) {
1296 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1297 if (cinfo->after == change_attr)
1298 goto out;
1299 break;
1300 default:
1301 if ((s64)(change_attr - cinfo->after) >= 0)
1302 goto out;
1303 }
1304
1305 inode_set_iversion_raw(inode, cinfo->after);
1306 if (!cinfo->atomic || cinfo->before != change_attr) {
1307 if (S_ISDIR(inode->i_mode))
1308 nfs_force_lookup_revalidate(inode);
1309
1310 if (!nfs_have_delegated_attributes(inode))
1311 cache_validity |=
1312 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1313 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1314 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1315 NFS_INO_INVALID_MODE | NFS_INO_INVALID_BTIME |
1316 NFS_INO_INVALID_XATTR;
1317 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1318 }
1319 nfsi->attrtimeo_timestamp = jiffies;
1320 nfsi->read_cache_jiffies = timestamp;
1321 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1322 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1323 out:
1324 nfs_set_cache_invalid(inode, cache_validity);
1325 }
1326
1327 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1328 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1329 unsigned long timestamp, unsigned long cache_validity)
1330 {
1331 spin_lock(&dir->i_lock);
1332 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1333 spin_unlock(&dir->i_lock);
1334 }
1335
1336 struct nfs4_open_createattrs {
1337 struct nfs4_label *label;
1338 struct iattr *sattr;
1339 const __u32 verf[2];
1340 };
1341
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1342 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1343 int err, struct nfs4_exception *exception)
1344 {
1345 if (err != -EINVAL)
1346 return false;
1347 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1348 return false;
1349 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1350 exception->retry = 1;
1351 return true;
1352 }
1353
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1354 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1355 {
1356 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1357 }
1358
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1359 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1360 {
1361 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1362
1363 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1364 }
1365
1366 static u32
nfs4_fmode_to_share_access(fmode_t fmode)1367 nfs4_fmode_to_share_access(fmode_t fmode)
1368 {
1369 u32 res = 0;
1370
1371 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1372 case FMODE_READ:
1373 res = NFS4_SHARE_ACCESS_READ;
1374 break;
1375 case FMODE_WRITE:
1376 res = NFS4_SHARE_ACCESS_WRITE;
1377 break;
1378 case FMODE_READ|FMODE_WRITE:
1379 res = NFS4_SHARE_ACCESS_BOTH;
1380 }
1381 return res;
1382 }
1383
1384 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1385 nfs4_map_atomic_open_share(struct nfs_server *server,
1386 fmode_t fmode, int openflags)
1387 {
1388 u32 res = nfs4_fmode_to_share_access(fmode);
1389
1390 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1391 goto out;
1392 /* Want no delegation if we're using O_DIRECT */
1393 if (openflags & O_DIRECT) {
1394 res |= NFS4_SHARE_WANT_NO_DELEG;
1395 goto out;
1396 }
1397 /* res |= NFS4_SHARE_WANT_NO_PREFERENCE; */
1398 if (server->caps & NFS_CAP_DELEGTIME)
1399 res |= NFS4_SHARE_WANT_DELEG_TIMESTAMPS;
1400 if (server->caps & NFS_CAP_OPEN_XOR)
1401 res |= NFS4_SHARE_WANT_OPEN_XOR_DELEGATION;
1402 out:
1403 return res;
1404 }
1405
1406 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1407 nfs4_map_atomic_open_claim(struct nfs_server *server,
1408 enum open_claim_type4 claim)
1409 {
1410 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1411 return claim;
1412 switch (claim) {
1413 default:
1414 return claim;
1415 case NFS4_OPEN_CLAIM_FH:
1416 return NFS4_OPEN_CLAIM_NULL;
1417 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1418 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1419 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1420 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1421 }
1422 }
1423
nfs4_init_opendata_res(struct nfs4_opendata * p)1424 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1425 {
1426 p->o_res.f_attr = &p->f_attr;
1427 p->o_res.seqid = p->o_arg.seqid;
1428 p->c_res.seqid = p->c_arg.seqid;
1429 p->o_res.server = p->o_arg.server;
1430 p->o_res.access_request = p->o_arg.access;
1431 nfs_fattr_init(&p->f_attr);
1432 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1433 }
1434
nfs4_opendata_alloc(struct dentry * dentry,struct nfs4_state_owner * sp,fmode_t fmode,int flags,const struct nfs4_open_createattrs * c,enum open_claim_type4 claim,gfp_t gfp_mask)1435 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1436 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1437 const struct nfs4_open_createattrs *c,
1438 enum open_claim_type4 claim,
1439 gfp_t gfp_mask)
1440 {
1441 struct dentry *parent = dget_parent(dentry);
1442 struct inode *dir = d_inode(parent);
1443 struct nfs_server *server = NFS_SERVER(dir);
1444 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1445 struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1446 struct nfs4_opendata *p;
1447
1448 p = kzalloc(sizeof(*p), gfp_mask);
1449 if (p == NULL)
1450 goto err;
1451
1452 p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1453 if (IS_ERR(p->f_attr.label))
1454 goto err_free_p;
1455
1456 p->a_label = nfs4_label_alloc(server, gfp_mask);
1457 if (IS_ERR(p->a_label))
1458 goto err_free_f;
1459
1460 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1461 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1462 if (IS_ERR(p->o_arg.seqid))
1463 goto err_free_label;
1464 nfs_sb_active(dentry->d_sb);
1465 p->dentry = dget(dentry);
1466 p->dir = parent;
1467 p->owner = sp;
1468 atomic_inc(&sp->so_count);
1469 p->o_arg.open_flags = flags;
1470 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1471 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1472 p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1473 fmode, flags);
1474 if (flags & O_CREAT) {
1475 p->o_arg.umask = current_umask();
1476 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1477 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1478 p->o_arg.u.attrs = &p->attrs;
1479 memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1480
1481 memcpy(p->o_arg.u.verifier.data, c->verf,
1482 sizeof(p->o_arg.u.verifier.data));
1483 }
1484 }
1485 /* ask server to check for all possible rights as results
1486 * are cached */
1487 switch (p->o_arg.claim) {
1488 default:
1489 break;
1490 case NFS4_OPEN_CLAIM_NULL:
1491 case NFS4_OPEN_CLAIM_FH:
1492 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1493 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1494 NFS4_ACCESS_EXECUTE |
1495 nfs_access_xattr_mask(server);
1496 }
1497 p->o_arg.clientid = server->nfs_client->cl_clientid;
1498 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1499 p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1500 p->o_arg.name = &dentry->d_name;
1501 p->o_arg.server = server;
1502 p->o_arg.bitmask = nfs4_bitmask(server, label);
1503 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1504 switch (p->o_arg.claim) {
1505 case NFS4_OPEN_CLAIM_NULL:
1506 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1507 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1508 p->o_arg.fh = NFS_FH(dir);
1509 break;
1510 case NFS4_OPEN_CLAIM_PREVIOUS:
1511 case NFS4_OPEN_CLAIM_FH:
1512 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1513 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1514 p->o_arg.fh = NFS_FH(d_inode(dentry));
1515 }
1516 p->c_arg.fh = &p->o_res.fh;
1517 p->c_arg.stateid = &p->o_res.stateid;
1518 p->c_arg.seqid = p->o_arg.seqid;
1519 nfs4_init_opendata_res(p);
1520 kref_init(&p->kref);
1521 return p;
1522
1523 err_free_label:
1524 nfs4_label_free(p->a_label);
1525 err_free_f:
1526 nfs4_label_free(p->f_attr.label);
1527 err_free_p:
1528 kfree(p);
1529 err:
1530 dput(parent);
1531 return NULL;
1532 }
1533
nfs4_opendata_free(struct kref * kref)1534 static void nfs4_opendata_free(struct kref *kref)
1535 {
1536 struct nfs4_opendata *p = container_of(kref,
1537 struct nfs4_opendata, kref);
1538 struct super_block *sb = p->dentry->d_sb;
1539
1540 nfs4_lgopen_release(p->lgp);
1541 nfs_free_seqid(p->o_arg.seqid);
1542 nfs4_sequence_free_slot(&p->o_res.seq_res);
1543 if (p->state != NULL)
1544 nfs4_put_open_state(p->state);
1545 nfs4_put_state_owner(p->owner);
1546
1547 nfs4_label_free(p->a_label);
1548 nfs4_label_free(p->f_attr.label);
1549
1550 dput(p->dir);
1551 dput(p->dentry);
1552 nfs_sb_deactive(sb);
1553 nfs_fattr_free_names(&p->f_attr);
1554 kfree(p->f_attr.mdsthreshold);
1555 kfree(p);
1556 }
1557
nfs4_opendata_put(struct nfs4_opendata * p)1558 static void nfs4_opendata_put(struct nfs4_opendata *p)
1559 {
1560 if (p != NULL)
1561 kref_put(&p->kref, nfs4_opendata_free);
1562 }
1563
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1564 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1565 fmode_t fmode)
1566 {
1567 switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1568 case FMODE_READ|FMODE_WRITE:
1569 return state->n_rdwr != 0;
1570 case FMODE_WRITE:
1571 return state->n_wronly != 0;
1572 case FMODE_READ:
1573 return state->n_rdonly != 0;
1574 }
1575 WARN_ON_ONCE(1);
1576 return false;
1577 }
1578
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1579 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1580 int open_mode, enum open_claim_type4 claim)
1581 {
1582 int ret = 0;
1583
1584 if (open_mode & (O_EXCL|O_TRUNC))
1585 goto out;
1586 switch (claim) {
1587 case NFS4_OPEN_CLAIM_NULL:
1588 case NFS4_OPEN_CLAIM_FH:
1589 goto out;
1590 default:
1591 break;
1592 }
1593 switch (mode & (FMODE_READ|FMODE_WRITE)) {
1594 case FMODE_READ:
1595 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1596 && state->n_rdonly != 0;
1597 break;
1598 case FMODE_WRITE:
1599 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1600 && state->n_wronly != 0;
1601 break;
1602 case FMODE_READ|FMODE_WRITE:
1603 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1604 && state->n_rdwr != 0;
1605 }
1606 out:
1607 return ret;
1608 }
1609
can_open_delegated(struct nfs_delegation * delegation,fmode_t fmode,enum open_claim_type4 claim)1610 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1611 enum open_claim_type4 claim)
1612 {
1613 if (delegation == NULL)
1614 return 0;
1615 if ((delegation->type & fmode) != fmode)
1616 return 0;
1617 switch (claim) {
1618 case NFS4_OPEN_CLAIM_NULL:
1619 case NFS4_OPEN_CLAIM_FH:
1620 break;
1621 case NFS4_OPEN_CLAIM_PREVIOUS:
1622 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1623 break;
1624 fallthrough;
1625 default:
1626 return 0;
1627 }
1628 nfs_mark_delegation_referenced(delegation);
1629 return 1;
1630 }
1631
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1632 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1633 {
1634 switch (fmode) {
1635 case FMODE_WRITE:
1636 state->n_wronly++;
1637 break;
1638 case FMODE_READ:
1639 state->n_rdonly++;
1640 break;
1641 case FMODE_READ|FMODE_WRITE:
1642 state->n_rdwr++;
1643 }
1644 nfs4_state_set_mode_locked(state, state->state | fmode);
1645 }
1646
1647 #ifdef CONFIG_NFS_V4_1
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1648 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1649 {
1650 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1651 return true;
1652 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1653 return true;
1654 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1655 return true;
1656 return false;
1657 }
1658 #endif /* CONFIG_NFS_V4_1 */
1659
nfs_state_log_update_open_stateid(struct nfs4_state * state)1660 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1661 {
1662 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1663 wake_up_all(&state->waitq);
1664 }
1665
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1666 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1667 {
1668 struct nfs_client *clp = state->owner->so_server->nfs_client;
1669 bool need_recover = false;
1670
1671 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1672 need_recover = true;
1673 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1674 need_recover = true;
1675 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1676 need_recover = true;
1677 if (need_recover)
1678 nfs4_state_mark_reclaim_nograce(clp, state);
1679 }
1680
1681 /*
1682 * Check for whether or not the caller may update the open stateid
1683 * to the value passed in by stateid.
1684 *
1685 * Note: This function relies heavily on the server implementing
1686 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1687 * correctly.
1688 * i.e. The stateid seqids have to be initialised to 1, and
1689 * are then incremented on every state transition.
1690 */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1691 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1692 const nfs4_stateid *stateid)
1693 {
1694 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1695 /* The common case - we're updating to a new sequence number */
1696 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1697 if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1698 return true;
1699 return false;
1700 }
1701 /* The server returned a new stateid */
1702 }
1703 /* This is the first OPEN in this generation */
1704 if (stateid->seqid == cpu_to_be32(1))
1705 return true;
1706 return false;
1707 }
1708
nfs_resync_open_stateid_locked(struct nfs4_state * state)1709 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1710 {
1711 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1712 return;
1713 if (state->n_wronly)
1714 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1715 if (state->n_rdonly)
1716 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1717 if (state->n_rdwr)
1718 set_bit(NFS_O_RDWR_STATE, &state->flags);
1719 set_bit(NFS_OPEN_STATE, &state->flags);
1720 }
1721
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1722 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1723 nfs4_stateid *stateid, fmode_t fmode)
1724 {
1725 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1726 switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1727 case FMODE_WRITE:
1728 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1729 break;
1730 case FMODE_READ:
1731 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1732 break;
1733 case 0:
1734 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1735 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1736 clear_bit(NFS_OPEN_STATE, &state->flags);
1737 }
1738 if (stateid == NULL)
1739 return;
1740 /* Handle OPEN+OPEN_DOWNGRADE races */
1741 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1742 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1743 nfs_resync_open_stateid_locked(state);
1744 goto out;
1745 }
1746 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1747 nfs4_stateid_copy(&state->stateid, stateid);
1748 nfs4_stateid_copy(&state->open_stateid, stateid);
1749 trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1750 out:
1751 nfs_state_log_update_open_stateid(state);
1752 }
1753
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1754 static void nfs_clear_open_stateid(struct nfs4_state *state,
1755 nfs4_stateid *arg_stateid,
1756 nfs4_stateid *stateid, fmode_t fmode)
1757 {
1758 write_seqlock(&state->seqlock);
1759 /* Ignore, if the CLOSE argment doesn't match the current stateid */
1760 if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1761 nfs_clear_open_stateid_locked(state, stateid, fmode);
1762 write_sequnlock(&state->seqlock);
1763 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1764 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1765 }
1766
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1767 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1768 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1769 __must_hold(&state->owner->so_lock)
1770 __must_hold(&state->seqlock)
1771 __must_hold(RCU)
1772
1773 {
1774 DEFINE_WAIT(wait);
1775 int status = 0;
1776 for (;;) {
1777
1778 if (nfs_stateid_is_sequential(state, stateid))
1779 break;
1780
1781 if (status)
1782 break;
1783 /* Rely on seqids for serialisation with NFSv4.0 */
1784 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1785 break;
1786
1787 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1788 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1789 /*
1790 * Ensure we process the state changes in the same order
1791 * in which the server processed them by delaying the
1792 * update of the stateid until we are in sequence.
1793 */
1794 write_sequnlock(&state->seqlock);
1795 spin_unlock(&state->owner->so_lock);
1796 rcu_read_unlock();
1797 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1798
1799 if (!fatal_signal_pending(current) &&
1800 !nfs_current_task_exiting()) {
1801 if (schedule_timeout(5*HZ) == 0)
1802 status = -EAGAIN;
1803 else
1804 status = 0;
1805 } else
1806 status = -EINTR;
1807 finish_wait(&state->waitq, &wait);
1808 rcu_read_lock();
1809 spin_lock(&state->owner->so_lock);
1810 write_seqlock(&state->seqlock);
1811 }
1812
1813 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1814 !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1815 nfs4_stateid_copy(freeme, &state->open_stateid);
1816 nfs_test_and_clear_all_open_stateid(state);
1817 }
1818
1819 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1820 nfs4_stateid_copy(&state->stateid, stateid);
1821 nfs4_stateid_copy(&state->open_stateid, stateid);
1822 trace_nfs4_open_stateid_update(state->inode, stateid, status);
1823 nfs_state_log_update_open_stateid(state);
1824 }
1825
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1826 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1827 const nfs4_stateid *open_stateid,
1828 fmode_t fmode,
1829 nfs4_stateid *freeme)
1830 {
1831 /*
1832 * Protect the call to nfs4_state_set_mode_locked and
1833 * serialise the stateid update
1834 */
1835 write_seqlock(&state->seqlock);
1836 nfs_set_open_stateid_locked(state, open_stateid, freeme);
1837 switch (fmode) {
1838 case FMODE_READ:
1839 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1840 break;
1841 case FMODE_WRITE:
1842 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1843 break;
1844 case FMODE_READ|FMODE_WRITE:
1845 set_bit(NFS_O_RDWR_STATE, &state->flags);
1846 }
1847 set_bit(NFS_OPEN_STATE, &state->flags);
1848 write_sequnlock(&state->seqlock);
1849 }
1850
nfs_state_clear_open_state_flags(struct nfs4_state * state)1851 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1852 {
1853 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1854 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1855 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1856 clear_bit(NFS_OPEN_STATE, &state->flags);
1857 }
1858
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1859 static void nfs_state_set_delegation(struct nfs4_state *state,
1860 const nfs4_stateid *deleg_stateid,
1861 fmode_t fmode)
1862 {
1863 /*
1864 * Protect the call to nfs4_state_set_mode_locked and
1865 * serialise the stateid update
1866 */
1867 write_seqlock(&state->seqlock);
1868 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1869 set_bit(NFS_DELEGATED_STATE, &state->flags);
1870 write_sequnlock(&state->seqlock);
1871 }
1872
nfs_state_clear_delegation(struct nfs4_state * state)1873 static void nfs_state_clear_delegation(struct nfs4_state *state)
1874 {
1875 write_seqlock(&state->seqlock);
1876 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1877 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1878 write_sequnlock(&state->seqlock);
1879 }
1880
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1881 int update_open_stateid(struct nfs4_state *state,
1882 const nfs4_stateid *open_stateid,
1883 const nfs4_stateid *delegation,
1884 fmode_t fmode)
1885 {
1886 struct nfs_server *server = NFS_SERVER(state->inode);
1887 struct nfs_client *clp = server->nfs_client;
1888 struct nfs_inode *nfsi = NFS_I(state->inode);
1889 struct nfs_delegation *deleg_cur;
1890 nfs4_stateid freeme = { };
1891 int ret = 0;
1892
1893 fmode &= (FMODE_READ|FMODE_WRITE);
1894
1895 rcu_read_lock();
1896 spin_lock(&state->owner->so_lock);
1897 if (open_stateid != NULL) {
1898 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1899 ret = 1;
1900 }
1901
1902 deleg_cur = nfs4_get_valid_delegation(state->inode);
1903 if (deleg_cur == NULL)
1904 goto no_delegation;
1905
1906 spin_lock(&deleg_cur->lock);
1907 if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1908 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1909 (deleg_cur->type & fmode) != fmode)
1910 goto no_delegation_unlock;
1911
1912 if (delegation == NULL)
1913 delegation = &deleg_cur->stateid;
1914 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1915 goto no_delegation_unlock;
1916
1917 nfs_mark_delegation_referenced(deleg_cur);
1918 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1919 ret = 1;
1920 no_delegation_unlock:
1921 spin_unlock(&deleg_cur->lock);
1922 no_delegation:
1923 if (ret)
1924 update_open_stateflags(state, fmode);
1925 spin_unlock(&state->owner->so_lock);
1926 rcu_read_unlock();
1927
1928 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1929 nfs4_schedule_state_manager(clp);
1930 if (freeme.type != 0)
1931 nfs4_test_and_free_stateid(server, &freeme,
1932 state->owner->so_cred);
1933
1934 return ret;
1935 }
1936
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1937 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1938 const nfs4_stateid *stateid)
1939 {
1940 struct nfs4_state *state = lsp->ls_state;
1941 bool ret = false;
1942
1943 spin_lock(&state->state_lock);
1944 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1945 goto out_noupdate;
1946 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1947 goto out_noupdate;
1948 nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1949 ret = true;
1950 out_noupdate:
1951 spin_unlock(&state->state_lock);
1952 return ret;
1953 }
1954
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1955 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1956 {
1957 struct nfs_delegation *delegation;
1958
1959 fmode &= FMODE_READ|FMODE_WRITE;
1960 rcu_read_lock();
1961 delegation = nfs4_get_valid_delegation(inode);
1962 if (delegation == NULL || (delegation->type & fmode) == fmode) {
1963 rcu_read_unlock();
1964 return;
1965 }
1966 rcu_read_unlock();
1967 nfs4_inode_return_delegation(inode);
1968 }
1969
nfs4_try_open_cached(struct nfs4_opendata * opendata)1970 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1971 {
1972 struct nfs4_state *state = opendata->state;
1973 struct nfs_delegation *delegation;
1974 int open_mode = opendata->o_arg.open_flags;
1975 fmode_t fmode = opendata->o_arg.fmode;
1976 enum open_claim_type4 claim = opendata->o_arg.claim;
1977 nfs4_stateid stateid;
1978 int ret = -EAGAIN;
1979
1980 for (;;) {
1981 spin_lock(&state->owner->so_lock);
1982 if (can_open_cached(state, fmode, open_mode, claim)) {
1983 update_open_stateflags(state, fmode);
1984 spin_unlock(&state->owner->so_lock);
1985 goto out_return_state;
1986 }
1987 spin_unlock(&state->owner->so_lock);
1988 rcu_read_lock();
1989 delegation = nfs4_get_valid_delegation(state->inode);
1990 if (!can_open_delegated(delegation, fmode, claim)) {
1991 rcu_read_unlock();
1992 break;
1993 }
1994 /* Save the delegation */
1995 nfs4_stateid_copy(&stateid, &delegation->stateid);
1996 rcu_read_unlock();
1997 nfs_release_seqid(opendata->o_arg.seqid);
1998 if (!opendata->is_recover) {
1999 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
2000 if (ret != 0)
2001 goto out;
2002 }
2003 ret = -EAGAIN;
2004
2005 /* Try to update the stateid using the delegation */
2006 if (update_open_stateid(state, NULL, &stateid, fmode))
2007 goto out_return_state;
2008 }
2009 out:
2010 return ERR_PTR(ret);
2011 out_return_state:
2012 refcount_inc(&state->count);
2013 return state;
2014 }
2015
2016 static void
nfs4_process_delegation(struct inode * inode,const struct cred * cred,enum open_claim_type4 claim,const struct nfs4_open_delegation * delegation)2017 nfs4_process_delegation(struct inode *inode, const struct cred *cred,
2018 enum open_claim_type4 claim,
2019 const struct nfs4_open_delegation *delegation)
2020 {
2021 switch (delegation->open_delegation_type) {
2022 case NFS4_OPEN_DELEGATE_READ:
2023 case NFS4_OPEN_DELEGATE_WRITE:
2024 case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
2025 case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
2026 break;
2027 default:
2028 return;
2029 }
2030 switch (claim) {
2031 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2032 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2033 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
2034 "returning a delegation for "
2035 "OPEN(CLAIM_DELEGATE_CUR)\n",
2036 NFS_SERVER(inode)->nfs_client->cl_hostname);
2037 break;
2038 case NFS4_OPEN_CLAIM_PREVIOUS:
2039 nfs_inode_reclaim_delegation(inode, cred, delegation->type,
2040 &delegation->stateid,
2041 delegation->pagemod_limit,
2042 delegation->open_delegation_type);
2043 break;
2044 default:
2045 nfs_inode_set_delegation(inode, cred, delegation->type,
2046 &delegation->stateid,
2047 delegation->pagemod_limit,
2048 delegation->open_delegation_type);
2049 }
2050 if (delegation->do_recall)
2051 nfs_async_inode_return_delegation(inode, &delegation->stateid);
2052 }
2053
2054 /*
2055 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
2056 * and update the nfs4_state.
2057 */
2058 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)2059 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2060 {
2061 struct inode *inode = data->state->inode;
2062 struct nfs4_state *state = data->state;
2063 int ret;
2064
2065 if (!data->rpc_done) {
2066 if (data->rpc_status)
2067 return ERR_PTR(data->rpc_status);
2068 return nfs4_try_open_cached(data);
2069 }
2070
2071 ret = nfs_refresh_inode(inode, &data->f_attr);
2072 if (ret)
2073 return ERR_PTR(ret);
2074
2075 nfs4_process_delegation(state->inode,
2076 data->owner->so_cred,
2077 data->o_arg.claim,
2078 &data->o_res.delegation);
2079
2080 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2081 if (!update_open_stateid(state, &data->o_res.stateid,
2082 NULL, data->o_arg.fmode))
2083 return ERR_PTR(-EAGAIN);
2084 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode))
2085 return ERR_PTR(-EAGAIN);
2086 refcount_inc(&state->count);
2087
2088 return state;
2089 }
2090
2091 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)2092 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2093 {
2094 struct inode *inode;
2095
2096 switch (data->o_arg.claim) {
2097 case NFS4_OPEN_CLAIM_NULL:
2098 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2099 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2100 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2101 return ERR_PTR(-EAGAIN);
2102 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2103 &data->f_attr);
2104 break;
2105 default:
2106 inode = d_inode(data->dentry);
2107 ihold(inode);
2108 nfs_refresh_inode(inode, &data->f_attr);
2109 }
2110 return inode;
2111 }
2112
2113 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2114 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2115 {
2116 struct nfs4_state *state;
2117 struct inode *inode;
2118
2119 inode = nfs4_opendata_get_inode(data);
2120 if (IS_ERR(inode))
2121 return ERR_CAST(inode);
2122 if (data->state != NULL && data->state->inode == inode) {
2123 state = data->state;
2124 refcount_inc(&state->count);
2125 } else
2126 state = nfs4_get_open_state(inode, data->owner);
2127 iput(inode);
2128 if (state == NULL)
2129 state = ERR_PTR(-ENOMEM);
2130 return state;
2131 }
2132
2133 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2134 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2135 {
2136 struct nfs4_state *state;
2137
2138 if (!data->rpc_done) {
2139 state = nfs4_try_open_cached(data);
2140 trace_nfs4_cached_open(data->state);
2141 goto out;
2142 }
2143
2144 state = nfs4_opendata_find_nfs4_state(data);
2145 if (IS_ERR(state))
2146 goto out;
2147
2148 nfs4_process_delegation(state->inode,
2149 data->owner->so_cred,
2150 data->o_arg.claim,
2151 &data->o_res.delegation);
2152
2153 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2154 if (!update_open_stateid(state, &data->o_res.stateid,
2155 NULL, data->o_arg.fmode)) {
2156 nfs4_put_open_state(state);
2157 state = ERR_PTR(-EAGAIN);
2158 }
2159 } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) {
2160 nfs4_put_open_state(state);
2161 state = ERR_PTR(-EAGAIN);
2162 }
2163 out:
2164 nfs_release_seqid(data->o_arg.seqid);
2165 return state;
2166 }
2167
2168 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2169 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2170 {
2171 struct nfs4_state *ret;
2172
2173 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2174 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2175 else
2176 ret = _nfs4_opendata_to_nfs4_state(data);
2177 nfs4_sequence_free_slot(&data->o_res.seq_res);
2178 return ret;
2179 }
2180
2181 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2182 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2183 {
2184 struct nfs_inode *nfsi = NFS_I(state->inode);
2185 struct nfs_open_context *ctx;
2186
2187 rcu_read_lock();
2188 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2189 if (ctx->state != state)
2190 continue;
2191 if ((ctx->mode & mode) != mode)
2192 continue;
2193 if (!get_nfs_open_context(ctx))
2194 continue;
2195 rcu_read_unlock();
2196 return ctx;
2197 }
2198 rcu_read_unlock();
2199 return ERR_PTR(-ENOENT);
2200 }
2201
2202 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2203 nfs4_state_find_open_context(struct nfs4_state *state)
2204 {
2205 struct nfs_open_context *ctx;
2206
2207 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2208 if (!IS_ERR(ctx))
2209 return ctx;
2210 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2211 if (!IS_ERR(ctx))
2212 return ctx;
2213 return nfs4_state_find_open_context_mode(state, FMODE_READ);
2214 }
2215
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2216 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2217 struct nfs4_state *state, enum open_claim_type4 claim)
2218 {
2219 struct nfs4_opendata *opendata;
2220
2221 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2222 NULL, claim, GFP_NOFS);
2223 if (opendata == NULL)
2224 return ERR_PTR(-ENOMEM);
2225 opendata->state = state;
2226 refcount_inc(&state->count);
2227 return opendata;
2228 }
2229
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2230 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2231 fmode_t fmode)
2232 {
2233 struct nfs4_state *newstate;
2234 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2235 int openflags = opendata->o_arg.open_flags;
2236 int ret;
2237
2238 if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2239 return 0;
2240 opendata->o_arg.fmode = fmode;
2241 opendata->o_arg.share_access =
2242 nfs4_map_atomic_open_share(server, fmode, openflags);
2243 memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2244 memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2245 nfs4_init_opendata_res(opendata);
2246 ret = _nfs4_recover_proc_open(opendata);
2247 if (ret != 0)
2248 return ret;
2249 newstate = nfs4_opendata_to_nfs4_state(opendata);
2250 if (IS_ERR(newstate))
2251 return PTR_ERR(newstate);
2252 if (newstate != opendata->state)
2253 ret = -ESTALE;
2254 nfs4_close_state(newstate, fmode);
2255 return ret;
2256 }
2257
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2258 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2259 {
2260 int ret;
2261
2262 /* memory barrier prior to reading state->n_* */
2263 smp_rmb();
2264 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2265 if (ret != 0)
2266 return ret;
2267 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2268 if (ret != 0)
2269 return ret;
2270 ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2271 if (ret != 0)
2272 return ret;
2273 /*
2274 * We may have performed cached opens for all three recoveries.
2275 * Check if we need to update the current stateid.
2276 */
2277 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2278 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2279 write_seqlock(&state->seqlock);
2280 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2281 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2282 write_sequnlock(&state->seqlock);
2283 }
2284 return 0;
2285 }
2286
2287 /*
2288 * OPEN_RECLAIM:
2289 * reclaim state on the server after a reboot.
2290 */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2291 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2292 {
2293 struct nfs_delegation *delegation;
2294 struct nfs4_opendata *opendata;
2295 u32 delegation_type = NFS4_OPEN_DELEGATE_NONE;
2296 int status;
2297
2298 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2299 NFS4_OPEN_CLAIM_PREVIOUS);
2300 if (IS_ERR(opendata))
2301 return PTR_ERR(opendata);
2302 rcu_read_lock();
2303 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2304 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) {
2305 switch(delegation->type) {
2306 case FMODE_READ:
2307 delegation_type = NFS4_OPEN_DELEGATE_READ;
2308 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2309 delegation_type = NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG;
2310 break;
2311 case FMODE_WRITE:
2312 case FMODE_READ|FMODE_WRITE:
2313 delegation_type = NFS4_OPEN_DELEGATE_WRITE;
2314 if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2315 delegation_type = NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG;
2316 }
2317 }
2318 rcu_read_unlock();
2319 opendata->o_arg.u.delegation_type = delegation_type;
2320 status = nfs4_open_recover(opendata, state);
2321 nfs4_opendata_put(opendata);
2322 return status;
2323 }
2324
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2325 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2326 {
2327 struct nfs_server *server = NFS_SERVER(state->inode);
2328 struct nfs4_exception exception = { };
2329 int err;
2330 do {
2331 err = _nfs4_do_open_reclaim(ctx, state);
2332 trace_nfs4_open_reclaim(ctx, 0, err);
2333 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2334 continue;
2335 if (err != -NFS4ERR_DELAY)
2336 break;
2337 nfs4_handle_exception(server, err, &exception);
2338 } while (exception.retry);
2339 return err;
2340 }
2341
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2342 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2343 {
2344 struct nfs_open_context *ctx;
2345 int ret;
2346
2347 ctx = nfs4_state_find_open_context(state);
2348 if (IS_ERR(ctx))
2349 return -EAGAIN;
2350 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2351 nfs_state_clear_open_state_flags(state);
2352 ret = nfs4_do_open_reclaim(ctx, state);
2353 put_nfs_open_context(ctx);
2354 return ret;
2355 }
2356
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2357 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2358 {
2359 switch (err) {
2360 default:
2361 printk(KERN_ERR "NFS: %s: unhandled error "
2362 "%d.\n", __func__, err);
2363 fallthrough;
2364 case 0:
2365 case -ENOENT:
2366 case -EAGAIN:
2367 case -ESTALE:
2368 case -ETIMEDOUT:
2369 break;
2370 case -NFS4ERR_BADSESSION:
2371 case -NFS4ERR_BADSLOT:
2372 case -NFS4ERR_BAD_HIGH_SLOT:
2373 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2374 case -NFS4ERR_DEADSESSION:
2375 return -EAGAIN;
2376 case -NFS4ERR_STALE_CLIENTID:
2377 case -NFS4ERR_STALE_STATEID:
2378 /* Don't recall a delegation if it was lost */
2379 nfs4_schedule_lease_recovery(server->nfs_client);
2380 return -EAGAIN;
2381 case -NFS4ERR_MOVED:
2382 nfs4_schedule_migration_recovery(server);
2383 return -EAGAIN;
2384 case -NFS4ERR_LEASE_MOVED:
2385 nfs4_schedule_lease_moved_recovery(server->nfs_client);
2386 return -EAGAIN;
2387 case -NFS4ERR_DELEG_REVOKED:
2388 case -NFS4ERR_ADMIN_REVOKED:
2389 case -NFS4ERR_EXPIRED:
2390 case -NFS4ERR_BAD_STATEID:
2391 case -NFS4ERR_OPENMODE:
2392 nfs_inode_find_state_and_recover(state->inode,
2393 stateid);
2394 nfs4_schedule_stateid_recovery(server, state);
2395 return -EAGAIN;
2396 case -NFS4ERR_DELAY:
2397 case -NFS4ERR_GRACE:
2398 ssleep(1);
2399 return -EAGAIN;
2400 case -ENOMEM:
2401 case -NFS4ERR_DENIED:
2402 if (fl) {
2403 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2404 if (lsp)
2405 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2406 }
2407 return 0;
2408 }
2409 return err;
2410 }
2411
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2412 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2413 struct nfs4_state *state, const nfs4_stateid *stateid)
2414 {
2415 struct nfs_server *server = NFS_SERVER(state->inode);
2416 struct nfs4_opendata *opendata;
2417 int err = 0;
2418
2419 opendata = nfs4_open_recoverdata_alloc(ctx, state,
2420 NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2421 if (IS_ERR(opendata))
2422 return PTR_ERR(opendata);
2423 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2424 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2425 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2426 if (err)
2427 goto out;
2428 }
2429 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2430 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2431 if (err)
2432 goto out;
2433 }
2434 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2435 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2436 if (err)
2437 goto out;
2438 }
2439 nfs_state_clear_delegation(state);
2440 out:
2441 nfs4_opendata_put(opendata);
2442 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2443 }
2444
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2445 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2446 {
2447 struct nfs4_opendata *data = calldata;
2448
2449 nfs4_setup_sequence(data->o_arg.server->nfs_client,
2450 &data->c_arg.seq_args, &data->c_res.seq_res, task);
2451 }
2452
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2453 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2454 {
2455 struct nfs4_opendata *data = calldata;
2456
2457 nfs40_sequence_done(task, &data->c_res.seq_res);
2458
2459 data->rpc_status = task->tk_status;
2460 if (data->rpc_status == 0) {
2461 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2462 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2463 renew_lease(data->o_res.server, data->timestamp);
2464 data->rpc_done = true;
2465 }
2466 }
2467
nfs4_open_confirm_release(void * calldata)2468 static void nfs4_open_confirm_release(void *calldata)
2469 {
2470 struct nfs4_opendata *data = calldata;
2471 struct nfs4_state *state = NULL;
2472
2473 /* If this request hasn't been cancelled, do nothing */
2474 if (!data->cancelled)
2475 goto out_free;
2476 /* In case of error, no cleanup! */
2477 if (!data->rpc_done)
2478 goto out_free;
2479 state = nfs4_opendata_to_nfs4_state(data);
2480 if (!IS_ERR(state))
2481 nfs4_close_state(state, data->o_arg.fmode);
2482 out_free:
2483 nfs4_opendata_put(data);
2484 }
2485
2486 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2487 .rpc_call_prepare = nfs4_open_confirm_prepare,
2488 .rpc_call_done = nfs4_open_confirm_done,
2489 .rpc_release = nfs4_open_confirm_release,
2490 };
2491
2492 /*
2493 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2494 */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2495 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2496 {
2497 struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2498 struct rpc_task *task;
2499 struct rpc_message msg = {
2500 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2501 .rpc_argp = &data->c_arg,
2502 .rpc_resp = &data->c_res,
2503 .rpc_cred = data->owner->so_cred,
2504 };
2505 struct rpc_task_setup task_setup_data = {
2506 .rpc_client = server->client,
2507 .rpc_message = &msg,
2508 .callback_ops = &nfs4_open_confirm_ops,
2509 .callback_data = data,
2510 .workqueue = nfsiod_workqueue,
2511 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2512 };
2513 int status;
2514
2515 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2516 data->is_recover);
2517 kref_get(&data->kref);
2518 data->rpc_done = false;
2519 data->rpc_status = 0;
2520 data->timestamp = jiffies;
2521 task = rpc_run_task(&task_setup_data);
2522 if (IS_ERR(task))
2523 return PTR_ERR(task);
2524 status = rpc_wait_for_completion_task(task);
2525 if (status != 0) {
2526 data->cancelled = true;
2527 smp_wmb();
2528 } else
2529 status = data->rpc_status;
2530 rpc_put_task(task);
2531 return status;
2532 }
2533
nfs4_open_prepare(struct rpc_task * task,void * calldata)2534 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2535 {
2536 struct nfs4_opendata *data = calldata;
2537 struct nfs4_state_owner *sp = data->owner;
2538 struct nfs_client *clp = sp->so_server->nfs_client;
2539 enum open_claim_type4 claim = data->o_arg.claim;
2540
2541 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2542 goto out_wait;
2543 /*
2544 * Check if we still need to send an OPEN call, or if we can use
2545 * a delegation instead.
2546 */
2547 if (data->state != NULL) {
2548 struct nfs_delegation *delegation;
2549
2550 if (can_open_cached(data->state, data->o_arg.fmode,
2551 data->o_arg.open_flags, claim))
2552 goto out_no_action;
2553 rcu_read_lock();
2554 delegation = nfs4_get_valid_delegation(data->state->inode);
2555 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2556 goto unlock_no_action;
2557 rcu_read_unlock();
2558 }
2559 /* Update client id. */
2560 data->o_arg.clientid = clp->cl_clientid;
2561 switch (claim) {
2562 default:
2563 break;
2564 case NFS4_OPEN_CLAIM_PREVIOUS:
2565 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2566 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2567 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2568 fallthrough;
2569 case NFS4_OPEN_CLAIM_FH:
2570 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2571 }
2572 data->timestamp = jiffies;
2573 if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2574 &data->o_arg.seq_args,
2575 &data->o_res.seq_res,
2576 task) != 0)
2577 nfs_release_seqid(data->o_arg.seqid);
2578
2579 /* Set the create mode (note dependency on the session type) */
2580 data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2581 if (data->o_arg.open_flags & O_EXCL) {
2582 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2583 if (clp->cl_mvops->minor_version == 0) {
2584 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2585 /* don't put an ACCESS op in OPEN compound if O_EXCL,
2586 * because ACCESS will return permission denied for
2587 * all bits until close */
2588 data->o_res.access_request = data->o_arg.access = 0;
2589 } else if (nfs4_has_persistent_session(clp))
2590 data->o_arg.createmode = NFS4_CREATE_GUARDED;
2591 }
2592 return;
2593 unlock_no_action:
2594 trace_nfs4_cached_open(data->state);
2595 rcu_read_unlock();
2596 out_no_action:
2597 task->tk_action = NULL;
2598 out_wait:
2599 nfs4_sequence_done(task, &data->o_res.seq_res);
2600 }
2601
nfs4_open_done(struct rpc_task * task,void * calldata)2602 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2603 {
2604 struct nfs4_opendata *data = calldata;
2605
2606 data->rpc_status = task->tk_status;
2607
2608 if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2609 return;
2610
2611 if (task->tk_status == 0) {
2612 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2613 switch (data->o_res.f_attr->mode & S_IFMT) {
2614 case S_IFREG:
2615 break;
2616 case S_IFLNK:
2617 data->rpc_status = -ELOOP;
2618 break;
2619 case S_IFDIR:
2620 data->rpc_status = -EISDIR;
2621 break;
2622 default:
2623 data->rpc_status = -ENOTDIR;
2624 }
2625 }
2626 renew_lease(data->o_res.server, data->timestamp);
2627 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2628 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2629 }
2630 data->rpc_done = true;
2631 }
2632
nfs4_open_release(void * calldata)2633 static void nfs4_open_release(void *calldata)
2634 {
2635 struct nfs4_opendata *data = calldata;
2636 struct nfs4_state *state = NULL;
2637
2638 /* In case of error, no cleanup! */
2639 if (data->rpc_status != 0 || !data->rpc_done) {
2640 nfs_release_seqid(data->o_arg.seqid);
2641 goto out_free;
2642 }
2643 /* If this request hasn't been cancelled, do nothing */
2644 if (!data->cancelled)
2645 goto out_free;
2646 /* In case we need an open_confirm, no cleanup! */
2647 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2648 goto out_free;
2649 state = nfs4_opendata_to_nfs4_state(data);
2650 if (!IS_ERR(state))
2651 nfs4_close_state(state, data->o_arg.fmode);
2652 out_free:
2653 nfs4_opendata_put(data);
2654 }
2655
2656 static const struct rpc_call_ops nfs4_open_ops = {
2657 .rpc_call_prepare = nfs4_open_prepare,
2658 .rpc_call_done = nfs4_open_done,
2659 .rpc_release = nfs4_open_release,
2660 };
2661
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2662 static int nfs4_run_open_task(struct nfs4_opendata *data,
2663 struct nfs_open_context *ctx)
2664 {
2665 struct inode *dir = d_inode(data->dir);
2666 struct nfs_server *server = NFS_SERVER(dir);
2667 struct nfs_openargs *o_arg = &data->o_arg;
2668 struct nfs_openres *o_res = &data->o_res;
2669 struct rpc_task *task;
2670 struct rpc_message msg = {
2671 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2672 .rpc_argp = o_arg,
2673 .rpc_resp = o_res,
2674 .rpc_cred = data->owner->so_cred,
2675 };
2676 struct rpc_task_setup task_setup_data = {
2677 .rpc_client = server->client,
2678 .rpc_message = &msg,
2679 .callback_ops = &nfs4_open_ops,
2680 .callback_data = data,
2681 .workqueue = nfsiod_workqueue,
2682 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2683 };
2684 int status;
2685
2686 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2687 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2688
2689 kref_get(&data->kref);
2690 data->rpc_done = false;
2691 data->rpc_status = 0;
2692 data->cancelled = false;
2693 data->is_recover = false;
2694 if (!ctx) {
2695 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2696 data->is_recover = true;
2697 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2698 } else {
2699 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2700 pnfs_lgopen_prepare(data, ctx);
2701 }
2702 task = rpc_run_task(&task_setup_data);
2703 if (IS_ERR(task))
2704 return PTR_ERR(task);
2705 status = rpc_wait_for_completion_task(task);
2706 if (status != 0) {
2707 data->cancelled = true;
2708 smp_wmb();
2709 } else
2710 status = data->rpc_status;
2711 rpc_put_task(task);
2712
2713 return status;
2714 }
2715
_nfs4_recover_proc_open(struct nfs4_opendata * data)2716 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2717 {
2718 struct inode *dir = d_inode(data->dir);
2719 struct nfs_openres *o_res = &data->o_res;
2720 int status;
2721
2722 status = nfs4_run_open_task(data, NULL);
2723 if (status != 0 || !data->rpc_done)
2724 return status;
2725
2726 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2727
2728 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2729 status = _nfs4_proc_open_confirm(data);
2730
2731 return status;
2732 }
2733
2734 /*
2735 * Additional permission checks in order to distinguish between an
2736 * open for read, and an open for execute. This works around the
2737 * fact that NFSv4 OPEN treats read and execute permissions as being
2738 * the same.
2739 * Note that in the non-execute case, we want to turn off permission
2740 * checking if we just created a new file (POSIX open() semantics).
2741 */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode)2742 static int nfs4_opendata_access(const struct cred *cred,
2743 struct nfs4_opendata *opendata,
2744 struct nfs4_state *state, fmode_t fmode)
2745 {
2746 struct nfs_access_entry cache;
2747 u32 mask, flags;
2748
2749 /* access call failed or for some reason the server doesn't
2750 * support any access modes -- defer access call until later */
2751 if (opendata->o_res.access_supported == 0)
2752 return 0;
2753
2754 mask = 0;
2755 if (fmode & FMODE_EXEC) {
2756 /* ONLY check for exec rights */
2757 if (S_ISDIR(state->inode->i_mode))
2758 mask = NFS4_ACCESS_LOOKUP;
2759 else
2760 mask = NFS4_ACCESS_EXECUTE;
2761 } else if ((fmode & FMODE_READ) && !opendata->file_created)
2762 mask = NFS4_ACCESS_READ;
2763
2764 nfs_access_set_mask(&cache, opendata->o_res.access_result);
2765 nfs_access_add_cache(state->inode, &cache, cred);
2766
2767 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2768 if ((mask & ~cache.mask & flags) == 0)
2769 return 0;
2770
2771 return -EACCES;
2772 }
2773
2774 /*
2775 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2776 */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2777 static int _nfs4_proc_open(struct nfs4_opendata *data,
2778 struct nfs_open_context *ctx)
2779 {
2780 struct inode *dir = d_inode(data->dir);
2781 struct nfs_server *server = NFS_SERVER(dir);
2782 struct nfs_openargs *o_arg = &data->o_arg;
2783 struct nfs_openres *o_res = &data->o_res;
2784 int status;
2785
2786 status = nfs4_run_open_task(data, ctx);
2787 if (!data->rpc_done)
2788 return status;
2789 if (status != 0) {
2790 if (status == -NFS4ERR_BADNAME &&
2791 !(o_arg->open_flags & O_CREAT))
2792 return -ENOENT;
2793 return status;
2794 }
2795
2796 nfs_fattr_map_and_free_names(server, &data->f_attr);
2797
2798 if (o_arg->open_flags & O_CREAT) {
2799 if (o_arg->open_flags & O_EXCL)
2800 data->file_created = true;
2801 else if (o_res->cinfo.before != o_res->cinfo.after)
2802 data->file_created = true;
2803 if (data->file_created ||
2804 inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2805 nfs4_update_changeattr(dir, &o_res->cinfo,
2806 o_res->f_attr->time_start,
2807 NFS_INO_INVALID_DATA);
2808 }
2809 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2810 server->caps &= ~NFS_CAP_POSIX_LOCK;
2811 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2812 status = _nfs4_proc_open_confirm(data);
2813 if (status != 0)
2814 return status;
2815 }
2816 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2817 struct nfs_fh *fh = &o_res->fh;
2818
2819 nfs4_sequence_free_slot(&o_res->seq_res);
2820 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2821 fh = NFS_FH(d_inode(data->dentry));
2822 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2823 }
2824 return 0;
2825 }
2826
2827 /*
2828 * OPEN_EXPIRED:
2829 * reclaim state on the server after a network partition.
2830 * Assumes caller holds the appropriate lock
2831 */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2832 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2833 {
2834 struct nfs4_opendata *opendata;
2835 int ret;
2836
2837 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2838 if (IS_ERR(opendata))
2839 return PTR_ERR(opendata);
2840 /*
2841 * We're not recovering a delegation, so ask for no delegation.
2842 * Otherwise the recovery thread could deadlock with an outstanding
2843 * delegation return.
2844 */
2845 opendata->o_arg.open_flags = O_DIRECT;
2846 ret = nfs4_open_recover(opendata, state);
2847 if (ret == -ESTALE)
2848 d_drop(ctx->dentry);
2849 nfs4_opendata_put(opendata);
2850 return ret;
2851 }
2852
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2853 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2854 {
2855 struct nfs_server *server = NFS_SERVER(state->inode);
2856 struct nfs4_exception exception = { };
2857 int err;
2858
2859 do {
2860 err = _nfs4_open_expired(ctx, state);
2861 trace_nfs4_open_expired(ctx, 0, err);
2862 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2863 continue;
2864 switch (err) {
2865 default:
2866 goto out;
2867 case -NFS4ERR_GRACE:
2868 case -NFS4ERR_DELAY:
2869 nfs4_handle_exception(server, err, &exception);
2870 err = 0;
2871 }
2872 } while (exception.retry);
2873 out:
2874 return err;
2875 }
2876
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2877 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2878 {
2879 struct nfs_open_context *ctx;
2880 int ret;
2881
2882 ctx = nfs4_state_find_open_context(state);
2883 if (IS_ERR(ctx))
2884 return -EAGAIN;
2885 ret = nfs4_do_open_expired(ctx, state);
2886 put_nfs_open_context(ctx);
2887 return ret;
2888 }
2889
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2890 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2891 const nfs4_stateid *stateid)
2892 {
2893 nfs_remove_bad_delegation(state->inode, stateid);
2894 nfs_state_clear_delegation(state);
2895 }
2896
nfs40_clear_delegation_stateid(struct nfs4_state * state)2897 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2898 {
2899 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2900 nfs_finish_clear_delegation_stateid(state, NULL);
2901 }
2902
nfs40_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2903 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2904 {
2905 /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2906 nfs40_clear_delegation_stateid(state);
2907 nfs_state_clear_open_state_flags(state);
2908 return nfs4_open_expired(sp, state);
2909 }
2910
nfs40_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2911 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2912 nfs4_stateid *stateid, const struct cred *cred)
2913 {
2914 return -NFS4ERR_BAD_STATEID;
2915 }
2916
2917 #if defined(CONFIG_NFS_V4_1)
nfs41_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2918 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2919 nfs4_stateid *stateid, const struct cred *cred)
2920 {
2921 int status;
2922
2923 switch (stateid->type) {
2924 default:
2925 break;
2926 case NFS4_INVALID_STATEID_TYPE:
2927 case NFS4_SPECIAL_STATEID_TYPE:
2928 case NFS4_FREED_STATEID_TYPE:
2929 return -NFS4ERR_BAD_STATEID;
2930 case NFS4_REVOKED_STATEID_TYPE:
2931 goto out_free;
2932 }
2933
2934 status = nfs41_test_stateid(server, stateid, cred);
2935 switch (status) {
2936 case -NFS4ERR_EXPIRED:
2937 case -NFS4ERR_ADMIN_REVOKED:
2938 case -NFS4ERR_DELEG_REVOKED:
2939 break;
2940 default:
2941 return status;
2942 }
2943 out_free:
2944 /* Ack the revoked state to the server */
2945 nfs41_free_stateid(server, stateid, cred, true);
2946 return -NFS4ERR_EXPIRED;
2947 }
2948
nfs41_check_delegation_stateid(struct nfs4_state * state)2949 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2950 {
2951 struct nfs_server *server = NFS_SERVER(state->inode);
2952 nfs4_stateid stateid;
2953 struct nfs_delegation *delegation;
2954 const struct cred *cred = NULL;
2955 int status, ret = NFS_OK;
2956
2957 /* Get the delegation credential for use by test/free_stateid */
2958 rcu_read_lock();
2959 delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2960 if (delegation == NULL) {
2961 rcu_read_unlock();
2962 nfs_state_clear_delegation(state);
2963 return NFS_OK;
2964 }
2965
2966 spin_lock(&delegation->lock);
2967 nfs4_stateid_copy(&stateid, &delegation->stateid);
2968
2969 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2970 &delegation->flags)) {
2971 spin_unlock(&delegation->lock);
2972 rcu_read_unlock();
2973 return NFS_OK;
2974 }
2975
2976 if (delegation->cred)
2977 cred = get_cred(delegation->cred);
2978 spin_unlock(&delegation->lock);
2979 rcu_read_unlock();
2980 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2981 trace_nfs4_test_delegation_stateid(state, NULL, status);
2982 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2983 nfs_finish_clear_delegation_stateid(state, &stateid);
2984 else
2985 ret = status;
2986
2987 put_cred(cred);
2988 return ret;
2989 }
2990
nfs41_delegation_recover_stateid(struct nfs4_state * state)2991 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2992 {
2993 nfs4_stateid tmp;
2994
2995 if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2996 nfs4_copy_delegation_stateid(state->inode, state->state,
2997 &tmp, NULL) &&
2998 nfs4_stateid_match_other(&state->stateid, &tmp))
2999 nfs_state_set_delegation(state, &tmp, state->state);
3000 else
3001 nfs_state_clear_delegation(state);
3002 }
3003
3004 /**
3005 * nfs41_check_expired_locks - possibly free a lock stateid
3006 *
3007 * @state: NFSv4 state for an inode
3008 *
3009 * Returns NFS_OK if recovery for this stateid is now finished.
3010 * Otherwise a negative NFS4ERR value is returned.
3011 */
nfs41_check_expired_locks(struct nfs4_state * state)3012 static int nfs41_check_expired_locks(struct nfs4_state *state)
3013 {
3014 int status, ret = NFS_OK;
3015 struct nfs4_lock_state *lsp, *prev = NULL;
3016 struct nfs_server *server = NFS_SERVER(state->inode);
3017
3018 if (!test_bit(LK_STATE_IN_USE, &state->flags))
3019 goto out;
3020
3021 spin_lock(&state->state_lock);
3022 list_for_each_entry(lsp, &state->lock_states, ls_locks) {
3023 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
3024 const struct cred *cred = lsp->ls_state->owner->so_cred;
3025
3026 refcount_inc(&lsp->ls_count);
3027 spin_unlock(&state->state_lock);
3028
3029 nfs4_put_lock_state(prev);
3030 prev = lsp;
3031
3032 status = nfs41_test_and_free_expired_stateid(server,
3033 &lsp->ls_stateid,
3034 cred);
3035 trace_nfs4_test_lock_stateid(state, lsp, status);
3036 if (status == -NFS4ERR_EXPIRED ||
3037 status == -NFS4ERR_BAD_STATEID) {
3038 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
3039 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
3040 if (!recover_lost_locks)
3041 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
3042 } else if (status != NFS_OK) {
3043 ret = status;
3044 nfs4_put_lock_state(prev);
3045 goto out;
3046 }
3047 spin_lock(&state->state_lock);
3048 }
3049 }
3050 spin_unlock(&state->state_lock);
3051 nfs4_put_lock_state(prev);
3052 out:
3053 return ret;
3054 }
3055
3056 /**
3057 * nfs41_check_open_stateid - possibly free an open stateid
3058 *
3059 * @state: NFSv4 state for an inode
3060 *
3061 * Returns NFS_OK if recovery for this stateid is now finished.
3062 * Otherwise a negative NFS4ERR value is returned.
3063 */
nfs41_check_open_stateid(struct nfs4_state * state)3064 static int nfs41_check_open_stateid(struct nfs4_state *state)
3065 {
3066 struct nfs_server *server = NFS_SERVER(state->inode);
3067 nfs4_stateid *stateid = &state->open_stateid;
3068 const struct cred *cred = state->owner->so_cred;
3069 int status;
3070
3071 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
3072 return -NFS4ERR_BAD_STATEID;
3073 status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
3074 trace_nfs4_test_open_stateid(state, NULL, status);
3075 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
3076 nfs_state_clear_open_state_flags(state);
3077 stateid->type = NFS4_INVALID_STATEID_TYPE;
3078 return status;
3079 }
3080 if (nfs_open_stateid_recover_openmode(state))
3081 return -NFS4ERR_OPENMODE;
3082 return NFS_OK;
3083 }
3084
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)3085 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3086 {
3087 int status;
3088
3089 status = nfs41_check_delegation_stateid(state);
3090 if (status != NFS_OK)
3091 return status;
3092 nfs41_delegation_recover_stateid(state);
3093
3094 status = nfs41_check_expired_locks(state);
3095 if (status != NFS_OK)
3096 return status;
3097 status = nfs41_check_open_stateid(state);
3098 if (status != NFS_OK)
3099 status = nfs4_open_expired(sp, state);
3100 return status;
3101 }
3102 #endif
3103
3104 /*
3105 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3106 * fields corresponding to attributes that were used to store the verifier.
3107 * Make sure we clobber those fields in the later setattr call
3108 */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)3109 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3110 struct iattr *sattr, struct nfs4_label **label)
3111 {
3112 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3113 __u32 attrset[3];
3114 unsigned ret;
3115 unsigned i;
3116
3117 for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3118 attrset[i] = opendata->o_res.attrset[i];
3119 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3120 attrset[i] &= ~bitmask[i];
3121 }
3122
3123 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3124 sattr->ia_valid : 0;
3125
3126 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3127 if (sattr->ia_valid & ATTR_ATIME_SET)
3128 ret |= ATTR_ATIME_SET;
3129 else
3130 ret |= ATTR_ATIME;
3131 }
3132
3133 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3134 if (sattr->ia_valid & ATTR_MTIME_SET)
3135 ret |= ATTR_MTIME_SET;
3136 else
3137 ret |= ATTR_MTIME;
3138 }
3139
3140 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3141 *label = NULL;
3142 return ret;
3143 }
3144
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,struct nfs_open_context * ctx)3145 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3146 struct nfs_open_context *ctx)
3147 {
3148 struct nfs4_state_owner *sp = opendata->owner;
3149 struct nfs_server *server = sp->so_server;
3150 struct dentry *dentry;
3151 struct nfs4_state *state;
3152 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3153 struct inode *dir = d_inode(opendata->dir);
3154 unsigned long dir_verifier;
3155 int ret;
3156
3157 dir_verifier = nfs_save_change_attribute(dir);
3158
3159 ret = _nfs4_proc_open(opendata, ctx);
3160 if (ret != 0)
3161 goto out;
3162
3163 state = _nfs4_opendata_to_nfs4_state(opendata);
3164 ret = PTR_ERR(state);
3165 if (IS_ERR(state))
3166 goto out;
3167 ctx->state = state;
3168 if (server->caps & NFS_CAP_POSIX_LOCK)
3169 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3170 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3171 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3172 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3173 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3174
3175 dentry = opendata->dentry;
3176 if (d_really_is_negative(dentry)) {
3177 struct dentry *alias;
3178 d_drop(dentry);
3179 alias = d_splice_alias(igrab(state->inode), dentry);
3180 /* d_splice_alias() can't fail here - it's a non-directory */
3181 if (alias) {
3182 dput(ctx->dentry);
3183 ctx->dentry = dentry = alias;
3184 }
3185 }
3186
3187 switch(opendata->o_arg.claim) {
3188 default:
3189 break;
3190 case NFS4_OPEN_CLAIM_NULL:
3191 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3192 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3193 if (!opendata->rpc_done)
3194 break;
3195 if (opendata->o_res.delegation.type != 0)
3196 dir_verifier = nfs_save_change_attribute(dir);
3197 nfs_set_verifier(dentry, dir_verifier);
3198 }
3199
3200 /* Parse layoutget results before we check for access */
3201 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3202
3203 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3204 if (ret != 0)
3205 goto out;
3206
3207 if (d_inode(dentry) == state->inode)
3208 nfs_inode_attach_open_context(ctx);
3209
3210 out:
3211 if (!opendata->cancelled) {
3212 if (opendata->lgp) {
3213 nfs4_lgopen_release(opendata->lgp);
3214 opendata->lgp = NULL;
3215 }
3216 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3217 }
3218 return ret;
3219 }
3220
3221 /*
3222 * Returns a referenced nfs4_state
3223 */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3224 static int _nfs4_do_open(struct inode *dir,
3225 struct nfs_open_context *ctx,
3226 int flags,
3227 const struct nfs4_open_createattrs *c,
3228 int *opened)
3229 {
3230 struct nfs4_state_owner *sp;
3231 struct nfs4_state *state = NULL;
3232 struct nfs_server *server = NFS_SERVER(dir);
3233 struct nfs4_opendata *opendata;
3234 struct dentry *dentry = ctx->dentry;
3235 const struct cred *cred = ctx->cred;
3236 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3237 fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3238 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3239 struct iattr *sattr = c->sattr;
3240 struct nfs4_label *label = c->label;
3241 int status;
3242
3243 /* Protect against reboot recovery conflicts */
3244 status = -ENOMEM;
3245 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3246 if (sp == NULL) {
3247 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3248 goto out_err;
3249 }
3250 status = nfs4_client_recover_expired_lease(server->nfs_client);
3251 if (status != 0)
3252 goto err_put_state_owner;
3253 if (d_really_is_positive(dentry))
3254 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3255 status = -ENOMEM;
3256 if (d_really_is_positive(dentry))
3257 claim = NFS4_OPEN_CLAIM_FH;
3258 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3259 c, claim, GFP_KERNEL);
3260 if (opendata == NULL)
3261 goto err_put_state_owner;
3262
3263 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3264 if (!opendata->f_attr.mdsthreshold) {
3265 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3266 if (!opendata->f_attr.mdsthreshold)
3267 goto err_opendata_put;
3268 }
3269 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3270 }
3271 if (d_really_is_positive(dentry))
3272 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3273
3274 status = _nfs4_open_and_get_state(opendata, ctx);
3275 if (status != 0)
3276 goto err_opendata_put;
3277 state = ctx->state;
3278
3279 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3280 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3281 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3282 /*
3283 * send create attributes which was not set by open
3284 * with an extra setattr.
3285 */
3286 if (attrs || label) {
3287 unsigned ia_old = sattr->ia_valid;
3288
3289 sattr->ia_valid = attrs;
3290 nfs_fattr_init(opendata->o_res.f_attr);
3291 status = nfs4_do_setattr(state->inode, cred,
3292 opendata->o_res.f_attr, sattr,
3293 ctx, label);
3294 if (status == 0) {
3295 nfs_setattr_update_inode(state->inode, sattr,
3296 opendata->o_res.f_attr);
3297 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3298 }
3299 sattr->ia_valid = ia_old;
3300 }
3301 }
3302 if (opened && opendata->file_created)
3303 *opened = 1;
3304
3305 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3306 *ctx_th = opendata->f_attr.mdsthreshold;
3307 opendata->f_attr.mdsthreshold = NULL;
3308 }
3309
3310 nfs4_opendata_put(opendata);
3311 nfs4_put_state_owner(sp);
3312 return 0;
3313 err_opendata_put:
3314 nfs4_opendata_put(opendata);
3315 err_put_state_owner:
3316 nfs4_put_state_owner(sp);
3317 out_err:
3318 return status;
3319 }
3320
3321
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3322 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3323 struct nfs_open_context *ctx,
3324 int flags,
3325 struct iattr *sattr,
3326 struct nfs4_label *label,
3327 int *opened)
3328 {
3329 struct nfs_server *server = NFS_SERVER(dir);
3330 struct nfs4_exception exception = {
3331 .interruptible = true,
3332 };
3333 struct nfs4_state *res;
3334 struct nfs4_open_createattrs c = {
3335 .label = label,
3336 .sattr = sattr,
3337 .verf = {
3338 [0] = (__u32)jiffies,
3339 [1] = (__u32)current->pid,
3340 },
3341 };
3342 int status;
3343
3344 do {
3345 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3346 res = ctx->state;
3347 trace_nfs4_open_file(ctx, flags, status);
3348 if (status == 0)
3349 break;
3350 /* NOTE: BAD_SEQID means the server and client disagree about the
3351 * book-keeping w.r.t. state-changing operations
3352 * (OPEN/CLOSE/LOCK/LOCKU...)
3353 * It is actually a sign of a bug on the client or on the server.
3354 *
3355 * If we receive a BAD_SEQID error in the particular case of
3356 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3357 * have unhashed the old state_owner for us, and that we can
3358 * therefore safely retry using a new one. We should still warn
3359 * the user though...
3360 */
3361 if (status == -NFS4ERR_BAD_SEQID) {
3362 pr_warn_ratelimited("NFS: v4 server %s "
3363 " returned a bad sequence-id error!\n",
3364 NFS_SERVER(dir)->nfs_client->cl_hostname);
3365 exception.retry = 1;
3366 continue;
3367 }
3368 /*
3369 * BAD_STATEID on OPEN means that the server cancelled our
3370 * state before it received the OPEN_CONFIRM.
3371 * Recover by retrying the request as per the discussion
3372 * on Page 181 of RFC3530.
3373 */
3374 if (status == -NFS4ERR_BAD_STATEID) {
3375 exception.retry = 1;
3376 continue;
3377 }
3378 if (status == -NFS4ERR_EXPIRED) {
3379 nfs4_schedule_lease_recovery(server->nfs_client);
3380 exception.retry = 1;
3381 continue;
3382 }
3383 if (status == -EAGAIN) {
3384 /* We must have found a delegation */
3385 exception.retry = 1;
3386 continue;
3387 }
3388 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3389 continue;
3390 res = ERR_PTR(nfs4_handle_exception(server,
3391 status, &exception));
3392 } while (exception.retry);
3393 return res;
3394 }
3395
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3396 static int _nfs4_do_setattr(struct inode *inode,
3397 struct nfs_setattrargs *arg,
3398 struct nfs_setattrres *res,
3399 const struct cred *cred,
3400 struct nfs_open_context *ctx)
3401 {
3402 struct nfs_server *server = NFS_SERVER(inode);
3403 struct rpc_message msg = {
3404 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3405 .rpc_argp = arg,
3406 .rpc_resp = res,
3407 .rpc_cred = cred,
3408 };
3409 const struct cred *delegation_cred = NULL;
3410 unsigned long timestamp = jiffies;
3411 bool truncate;
3412 int status;
3413
3414 nfs_fattr_init(res->fattr);
3415
3416 /* Servers should only apply open mode checks for file size changes */
3417 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3418 if (!truncate) {
3419 nfs4_inode_make_writeable(inode);
3420 goto zero_stateid;
3421 }
3422
3423 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3424 /* Use that stateid */
3425 } else if (ctx != NULL && ctx->state) {
3426 struct nfs_lock_context *l_ctx;
3427 if (!nfs4_valid_open_stateid(ctx->state))
3428 return -EBADF;
3429 l_ctx = nfs_get_lock_context(ctx);
3430 if (IS_ERR(l_ctx))
3431 return PTR_ERR(l_ctx);
3432 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3433 &arg->stateid, &delegation_cred);
3434 nfs_put_lock_context(l_ctx);
3435 if (status == -EIO)
3436 return -EBADF;
3437 else if (status == -EAGAIN)
3438 goto zero_stateid;
3439 } else {
3440 zero_stateid:
3441 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3442 }
3443 if (delegation_cred)
3444 msg.rpc_cred = delegation_cred;
3445
3446 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3447
3448 put_cred(delegation_cred);
3449 if (status == 0 && ctx != NULL)
3450 renew_lease(server, timestamp);
3451 trace_nfs4_setattr(inode, &arg->stateid, status);
3452 return status;
3453 }
3454
nfs4_do_setattr(struct inode * inode,const struct cred * cred,struct nfs_fattr * fattr,struct iattr * sattr,struct nfs_open_context * ctx,struct nfs4_label * ilabel)3455 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3456 struct nfs_fattr *fattr, struct iattr *sattr,
3457 struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3458 {
3459 struct nfs_server *server = NFS_SERVER(inode);
3460 __u32 bitmask[NFS4_BITMASK_SZ];
3461 struct nfs4_state *state = ctx ? ctx->state : NULL;
3462 struct nfs_setattrargs arg = {
3463 .fh = NFS_FH(inode),
3464 .iap = sattr,
3465 .server = server,
3466 .bitmask = bitmask,
3467 .label = ilabel,
3468 };
3469 struct nfs_setattrres res = {
3470 .fattr = fattr,
3471 .server = server,
3472 };
3473 struct nfs4_exception exception = {
3474 .state = state,
3475 .inode = inode,
3476 .stateid = &arg.stateid,
3477 };
3478 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE |
3479 NFS_INO_INVALID_CTIME;
3480 int err;
3481
3482 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3483 adjust_flags |= NFS_INO_INVALID_MODE;
3484 if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3485 adjust_flags |= NFS_INO_INVALID_OTHER;
3486 if (sattr->ia_valid & ATTR_ATIME)
3487 adjust_flags |= NFS_INO_INVALID_ATIME;
3488 if (sattr->ia_valid & ATTR_MTIME)
3489 adjust_flags |= NFS_INO_INVALID_MTIME;
3490
3491 do {
3492 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3493 inode, adjust_flags);
3494
3495 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3496 switch (err) {
3497 case -NFS4ERR_OPENMODE:
3498 if (!(sattr->ia_valid & ATTR_SIZE)) {
3499 pr_warn_once("NFSv4: server %s is incorrectly "
3500 "applying open mode checks to "
3501 "a SETATTR that is not "
3502 "changing file size.\n",
3503 server->nfs_client->cl_hostname);
3504 }
3505 if (state && !(state->state & FMODE_WRITE)) {
3506 err = -EBADF;
3507 if (sattr->ia_valid & ATTR_OPEN)
3508 err = -EACCES;
3509 goto out;
3510 }
3511 }
3512 err = nfs4_handle_exception(server, err, &exception);
3513 } while (exception.retry);
3514 out:
3515 return err;
3516 }
3517
3518 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3519 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3520 {
3521 if (inode == NULL || !nfs_have_layout(inode))
3522 return false;
3523
3524 return pnfs_wait_on_layoutreturn(inode, task);
3525 }
3526
3527 /*
3528 * Update the seqid of an open stateid
3529 */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3530 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3531 struct nfs4_state *state)
3532 {
3533 __be32 seqid_open;
3534 u32 dst_seqid;
3535 int seq;
3536
3537 for (;;) {
3538 if (!nfs4_valid_open_stateid(state))
3539 break;
3540 seq = read_seqbegin(&state->seqlock);
3541 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3542 nfs4_stateid_copy(dst, &state->open_stateid);
3543 if (read_seqretry(&state->seqlock, seq))
3544 continue;
3545 break;
3546 }
3547 seqid_open = state->open_stateid.seqid;
3548 if (read_seqretry(&state->seqlock, seq))
3549 continue;
3550
3551 dst_seqid = be32_to_cpu(dst->seqid);
3552 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3553 dst->seqid = seqid_open;
3554 break;
3555 }
3556 }
3557
3558 /*
3559 * Update the seqid of an open stateid after receiving
3560 * NFS4ERR_OLD_STATEID
3561 */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3562 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3563 struct nfs4_state *state)
3564 {
3565 __be32 seqid_open;
3566 u32 dst_seqid;
3567 bool ret;
3568 int seq, status = -EAGAIN;
3569 DEFINE_WAIT(wait);
3570
3571 for (;;) {
3572 ret = false;
3573 if (!nfs4_valid_open_stateid(state))
3574 break;
3575 seq = read_seqbegin(&state->seqlock);
3576 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3577 if (read_seqretry(&state->seqlock, seq))
3578 continue;
3579 break;
3580 }
3581
3582 write_seqlock(&state->seqlock);
3583 seqid_open = state->open_stateid.seqid;
3584
3585 dst_seqid = be32_to_cpu(dst->seqid);
3586
3587 /* Did another OPEN bump the state's seqid? try again: */
3588 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3589 dst->seqid = seqid_open;
3590 write_sequnlock(&state->seqlock);
3591 ret = true;
3592 break;
3593 }
3594
3595 /* server says we're behind but we haven't seen the update yet */
3596 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3597 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3598 write_sequnlock(&state->seqlock);
3599 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3600
3601 if (fatal_signal_pending(current) || nfs_current_task_exiting())
3602 status = -EINTR;
3603 else
3604 if (schedule_timeout(5*HZ) != 0)
3605 status = 0;
3606
3607 finish_wait(&state->waitq, &wait);
3608
3609 if (!status)
3610 continue;
3611 if (status == -EINTR)
3612 break;
3613
3614 /* we slept the whole 5 seconds, we must have lost a seqid */
3615 dst->seqid = cpu_to_be32(dst_seqid + 1);
3616 ret = true;
3617 break;
3618 }
3619
3620 return ret;
3621 }
3622
3623 struct nfs4_closedata {
3624 struct inode *inode;
3625 struct nfs4_state *state;
3626 struct nfs_closeargs arg;
3627 struct nfs_closeres res;
3628 struct {
3629 struct nfs4_layoutreturn_args arg;
3630 struct nfs4_layoutreturn_res res;
3631 struct nfs4_xdr_opaque_data ld_private;
3632 u32 roc_barrier;
3633 bool roc;
3634 } lr;
3635 struct nfs_fattr fattr;
3636 unsigned long timestamp;
3637 };
3638
nfs4_free_closedata(void * data)3639 static void nfs4_free_closedata(void *data)
3640 {
3641 struct nfs4_closedata *calldata = data;
3642 struct nfs4_state_owner *sp = calldata->state->owner;
3643 struct super_block *sb = calldata->state->inode->i_sb;
3644
3645 if (calldata->lr.roc)
3646 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3647 calldata->res.lr_ret);
3648 nfs4_put_open_state(calldata->state);
3649 nfs_free_seqid(calldata->arg.seqid);
3650 nfs4_put_state_owner(sp);
3651 nfs_sb_deactive(sb);
3652 kfree(calldata);
3653 }
3654
nfs4_close_done(struct rpc_task * task,void * data)3655 static void nfs4_close_done(struct rpc_task *task, void *data)
3656 {
3657 struct nfs4_closedata *calldata = data;
3658 struct nfs4_state *state = calldata->state;
3659 struct nfs_server *server = NFS_SERVER(calldata->inode);
3660 nfs4_stateid *res_stateid = NULL;
3661 struct nfs4_exception exception = {
3662 .state = state,
3663 .inode = calldata->inode,
3664 .stateid = &calldata->arg.stateid,
3665 };
3666
3667 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3668 return;
3669 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3670
3671 /* Handle Layoutreturn errors */
3672 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3673 &calldata->res.lr_ret) == -EAGAIN)
3674 goto out_restart;
3675
3676 /* hmm. we are done with the inode, and in the process of freeing
3677 * the state_owner. we keep this around to process errors
3678 */
3679 switch (task->tk_status) {
3680 case 0:
3681 res_stateid = &calldata->res.stateid;
3682 renew_lease(server, calldata->timestamp);
3683 break;
3684 case -NFS4ERR_ACCESS:
3685 if (calldata->arg.bitmask != NULL) {
3686 calldata->arg.bitmask = NULL;
3687 calldata->res.fattr = NULL;
3688 goto out_restart;
3689
3690 }
3691 break;
3692 case -NFS4ERR_OLD_STATEID:
3693 /* Did we race with OPEN? */
3694 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3695 state))
3696 goto out_restart;
3697 goto out_release;
3698 case -NFS4ERR_ADMIN_REVOKED:
3699 case -NFS4ERR_STALE_STATEID:
3700 case -NFS4ERR_EXPIRED:
3701 nfs4_free_revoked_stateid(server,
3702 &calldata->arg.stateid,
3703 task->tk_msg.rpc_cred);
3704 fallthrough;
3705 case -NFS4ERR_BAD_STATEID:
3706 if (calldata->arg.fmode == 0)
3707 break;
3708 fallthrough;
3709 default:
3710 task->tk_status = nfs4_async_handle_exception(task,
3711 server, task->tk_status, &exception);
3712 if (exception.retry)
3713 goto out_restart;
3714 }
3715 nfs_clear_open_stateid(state, &calldata->arg.stateid,
3716 res_stateid, calldata->arg.fmode);
3717 out_release:
3718 task->tk_status = 0;
3719 nfs_release_seqid(calldata->arg.seqid);
3720 nfs_refresh_inode(calldata->inode, &calldata->fattr);
3721 dprintk("%s: ret = %d\n", __func__, task->tk_status);
3722 return;
3723 out_restart:
3724 task->tk_status = 0;
3725 rpc_restart_call_prepare(task);
3726 goto out_release;
3727 }
3728
nfs4_close_prepare(struct rpc_task * task,void * data)3729 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3730 {
3731 struct nfs4_closedata *calldata = data;
3732 struct nfs4_state *state = calldata->state;
3733 struct inode *inode = calldata->inode;
3734 struct nfs_server *server = NFS_SERVER(inode);
3735 struct pnfs_layout_hdr *lo;
3736 bool is_rdonly, is_wronly, is_rdwr;
3737 int call_close = 0;
3738
3739 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3740 goto out_wait;
3741
3742 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3743 spin_lock(&state->owner->so_lock);
3744 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3745 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3746 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3747 /* Calculate the change in open mode */
3748 calldata->arg.fmode = 0;
3749 if (state->n_rdwr == 0) {
3750 if (state->n_rdonly == 0)
3751 call_close |= is_rdonly;
3752 else if (is_rdonly)
3753 calldata->arg.fmode |= FMODE_READ;
3754 if (state->n_wronly == 0)
3755 call_close |= is_wronly;
3756 else if (is_wronly)
3757 calldata->arg.fmode |= FMODE_WRITE;
3758 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3759 call_close |= is_rdwr;
3760 } else if (is_rdwr)
3761 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3762
3763 nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3764 if (!nfs4_valid_open_stateid(state))
3765 call_close = 0;
3766 spin_unlock(&state->owner->so_lock);
3767
3768 if (!call_close) {
3769 /* Note: exit _without_ calling nfs4_close_done */
3770 goto out_no_action;
3771 }
3772
3773 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3774 nfs_release_seqid(calldata->arg.seqid);
3775 goto out_wait;
3776 }
3777
3778 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3779 if (lo && !pnfs_layout_is_valid(lo)) {
3780 calldata->arg.lr_args = NULL;
3781 calldata->res.lr_res = NULL;
3782 }
3783
3784 if (calldata->arg.fmode == 0)
3785 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3786
3787 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3788 /* Close-to-open cache consistency revalidation */
3789 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
3790 nfs4_bitmask_set(calldata->arg.bitmask_store,
3791 server->cache_consistency_bitmask,
3792 inode, 0);
3793 calldata->arg.bitmask = calldata->arg.bitmask_store;
3794 } else
3795 calldata->arg.bitmask = NULL;
3796 }
3797
3798 calldata->arg.share_access =
3799 nfs4_fmode_to_share_access(calldata->arg.fmode);
3800
3801 if (calldata->res.fattr == NULL)
3802 calldata->arg.bitmask = NULL;
3803 else if (calldata->arg.bitmask == NULL)
3804 calldata->res.fattr = NULL;
3805 calldata->timestamp = jiffies;
3806 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3807 &calldata->arg.seq_args,
3808 &calldata->res.seq_res,
3809 task) != 0)
3810 nfs_release_seqid(calldata->arg.seqid);
3811 return;
3812 out_no_action:
3813 task->tk_action = NULL;
3814 out_wait:
3815 nfs4_sequence_done(task, &calldata->res.seq_res);
3816 }
3817
3818 static const struct rpc_call_ops nfs4_close_ops = {
3819 .rpc_call_prepare = nfs4_close_prepare,
3820 .rpc_call_done = nfs4_close_done,
3821 .rpc_release = nfs4_free_closedata,
3822 };
3823
3824 /*
3825 * It is possible for data to be read/written from a mem-mapped file
3826 * after the sys_close call (which hits the vfs layer as a flush).
3827 * This means that we can't safely call nfsv4 close on a file until
3828 * the inode is cleared. This in turn means that we are not good
3829 * NFSv4 citizens - we do not indicate to the server to update the file's
3830 * share state even when we are done with one of the three share
3831 * stateid's in the inode.
3832 *
3833 * NOTE: Caller must be holding the sp->so_owner semaphore!
3834 */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3835 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3836 {
3837 struct nfs_server *server = NFS_SERVER(state->inode);
3838 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3839 struct nfs4_closedata *calldata;
3840 struct nfs4_state_owner *sp = state->owner;
3841 struct rpc_task *task;
3842 struct rpc_message msg = {
3843 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3844 .rpc_cred = state->owner->so_cred,
3845 };
3846 struct rpc_task_setup task_setup_data = {
3847 .rpc_client = server->client,
3848 .rpc_message = &msg,
3849 .callback_ops = &nfs4_close_ops,
3850 .workqueue = nfsiod_workqueue,
3851 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3852 };
3853 int status = -ENOMEM;
3854
3855 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3856 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3857
3858 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3859 &task_setup_data.rpc_client, &msg);
3860
3861 calldata = kzalloc(sizeof(*calldata), gfp_mask);
3862 if (calldata == NULL)
3863 goto out;
3864 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3865 calldata->inode = state->inode;
3866 calldata->state = state;
3867 calldata->arg.fh = NFS_FH(state->inode);
3868 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3869 goto out_free_calldata;
3870 /* Serialization for the sequence id */
3871 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3872 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3873 if (IS_ERR(calldata->arg.seqid))
3874 goto out_free_calldata;
3875 nfs_fattr_init(&calldata->fattr);
3876 calldata->arg.fmode = 0;
3877 calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3878 calldata->res.fattr = &calldata->fattr;
3879 calldata->res.seqid = calldata->arg.seqid;
3880 calldata->res.server = server;
3881 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3882 calldata->lr.roc = pnfs_roc(state->inode,
3883 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3884 if (calldata->lr.roc) {
3885 calldata->arg.lr_args = &calldata->lr.arg;
3886 calldata->res.lr_res = &calldata->lr.res;
3887 }
3888 nfs_sb_active(calldata->inode->i_sb);
3889
3890 msg.rpc_argp = &calldata->arg;
3891 msg.rpc_resp = &calldata->res;
3892 task_setup_data.callback_data = calldata;
3893 task = rpc_run_task(&task_setup_data);
3894 if (IS_ERR(task))
3895 return PTR_ERR(task);
3896 status = 0;
3897 if (wait)
3898 status = rpc_wait_for_completion_task(task);
3899 rpc_put_task(task);
3900 return status;
3901 out_free_calldata:
3902 kfree(calldata);
3903 out:
3904 nfs4_put_open_state(state);
3905 nfs4_put_state_owner(sp);
3906 return status;
3907 }
3908
3909 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3910 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3911 int open_flags, struct iattr *attr, int *opened)
3912 {
3913 struct nfs4_state *state;
3914 struct nfs4_label l, *label;
3915
3916 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3917
3918 /* Protect against concurrent sillydeletes */
3919 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3920
3921 nfs4_label_release_security(label);
3922
3923 if (IS_ERR(state))
3924 return ERR_CAST(state);
3925 return state->inode;
3926 }
3927
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3928 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3929 {
3930 struct dentry *dentry = ctx->dentry;
3931 if (ctx->state == NULL)
3932 return;
3933 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
3934 nfs4_inode_set_return_delegation_on_close(d_inode(dentry));
3935 if (is_sync)
3936 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3937 else
3938 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3939 }
3940
3941 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3942 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3943 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_OPEN_ARGUMENTS - 1UL)
3944
3945 #define FATTR4_WORD2_NFS42_TIME_DELEG_MASK \
3946 (FATTR4_WORD2_TIME_DELEG_MODIFY|FATTR4_WORD2_TIME_DELEG_ACCESS)
nfs4_server_delegtime_capable(struct nfs4_server_caps_res * res)3947 static bool nfs4_server_delegtime_capable(struct nfs4_server_caps_res *res)
3948 {
3949 u32 share_access_want = res->open_caps.oa_share_access_want[0];
3950 u32 attr_bitmask = res->attr_bitmask[2];
3951
3952 return (share_access_want & NFS4_SHARE_WANT_DELEG_TIMESTAMPS) &&
3953 ((attr_bitmask & FATTR4_WORD2_NFS42_TIME_DELEG_MASK) ==
3954 FATTR4_WORD2_NFS42_TIME_DELEG_MASK);
3955 }
3956
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3957 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3958 {
3959 u32 minorversion = server->nfs_client->cl_minorversion;
3960 u32 bitmask[3] = {
3961 [0] = FATTR4_WORD0_SUPPORTED_ATTRS,
3962 };
3963 struct nfs4_server_caps_arg args = {
3964 .fhandle = fhandle,
3965 .bitmask = bitmask,
3966 };
3967 struct nfs4_server_caps_res res = {};
3968 struct rpc_message msg = {
3969 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3970 .rpc_argp = &args,
3971 .rpc_resp = &res,
3972 };
3973 int status;
3974 int i;
3975
3976 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3977 FATTR4_WORD0_FH_EXPIRE_TYPE |
3978 FATTR4_WORD0_LINK_SUPPORT |
3979 FATTR4_WORD0_SYMLINK_SUPPORT |
3980 FATTR4_WORD0_ACLSUPPORT |
3981 FATTR4_WORD0_CASE_INSENSITIVE |
3982 FATTR4_WORD0_CASE_PRESERVING;
3983 if (minorversion)
3984 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3985 if (minorversion > 1)
3986 bitmask[2] |= FATTR4_WORD2_OPEN_ARGUMENTS;
3987
3988 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3989 if (status == 0) {
3990 bitmask[0] = (FATTR4_WORD0_SUPPORTED_ATTRS |
3991 FATTR4_WORD0_FH_EXPIRE_TYPE |
3992 FATTR4_WORD0_LINK_SUPPORT |
3993 FATTR4_WORD0_SYMLINK_SUPPORT |
3994 FATTR4_WORD0_ACLSUPPORT |
3995 FATTR4_WORD0_CASE_INSENSITIVE |
3996 FATTR4_WORD0_CASE_PRESERVING) &
3997 res.attr_bitmask[0];
3998 /* Sanity check the server answers */
3999 switch (minorversion) {
4000 case 0:
4001 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
4002 res.attr_bitmask[2] = 0;
4003 break;
4004 case 1:
4005 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
4006 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT &
4007 res.attr_bitmask[2];
4008 break;
4009 case 2:
4010 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
4011 bitmask[2] = (FATTR4_WORD2_SUPPATTR_EXCLCREAT |
4012 FATTR4_WORD2_OPEN_ARGUMENTS) &
4013 res.attr_bitmask[2];
4014 }
4015 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
4016 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
4017 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
4018 server->fattr_valid = NFS_ATTR_FATTR_V4;
4019 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
4020 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4021 server->caps |= NFS_CAP_ACLS;
4022 if (res.has_links != 0)
4023 server->caps |= NFS_CAP_HARDLINKS;
4024 if (res.has_symlinks != 0)
4025 server->caps |= NFS_CAP_SYMLINKS;
4026 if (res.case_insensitive)
4027 server->caps |= NFS_CAP_CASE_INSENSITIVE;
4028 if (res.case_preserving)
4029 server->caps |= NFS_CAP_CASE_PRESERVING;
4030 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4031 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
4032 server->caps |= NFS_CAP_SECURITY_LABEL;
4033 #endif
4034 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
4035 server->caps |= NFS_CAP_FS_LOCATIONS;
4036 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
4037 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
4038 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
4039 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
4040 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
4041 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
4042 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
4043 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
4044 NFS_ATTR_FATTR_OWNER_NAME);
4045 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
4046 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
4047 NFS_ATTR_FATTR_GROUP_NAME);
4048 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
4049 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
4050 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
4051 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
4052 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
4053 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
4054 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
4055 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
4056 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
4057 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
4058 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_CREATE))
4059 server->fattr_valid &= ~NFS_ATTR_FATTR_BTIME;
4060 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
4061 sizeof(server->attr_bitmask));
4062 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4063
4064 if (res.open_caps.oa_share_access_want[0] &
4065 NFS4_SHARE_WANT_OPEN_XOR_DELEGATION)
4066 server->caps |= NFS_CAP_OPEN_XOR;
4067 if (nfs4_server_delegtime_capable(&res))
4068 server->caps |= NFS_CAP_DELEGTIME;
4069
4070 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
4071 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
4072 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
4073 server->cache_consistency_bitmask[2] = 0;
4074
4075 /* Avoid a regression due to buggy server */
4076 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
4077 res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
4078 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
4079 sizeof(server->exclcreat_bitmask));
4080
4081 server->acl_bitmask = res.acl_bitmask;
4082 server->fh_expire_type = res.fh_expire_type;
4083 }
4084
4085 return status;
4086 }
4087
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)4088 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
4089 {
4090 struct nfs4_exception exception = {
4091 .interruptible = true,
4092 };
4093 int err;
4094
4095 nfs_server_set_init_caps(server);
4096 do {
4097 err = nfs4_handle_exception(server,
4098 _nfs4_server_capabilities(server, fhandle),
4099 &exception);
4100 } while (exception.retry);
4101 return err;
4102 }
4103
test_fs_location_for_trunking(struct nfs4_fs_location * location,struct nfs_client * clp,struct nfs_server * server)4104 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
4105 struct nfs_client *clp,
4106 struct nfs_server *server)
4107 {
4108 int i;
4109
4110 for (i = 0; i < location->nservers; i++) {
4111 struct nfs4_string *srv_loc = &location->servers[i];
4112 struct sockaddr_storage addr;
4113 size_t addrlen;
4114 struct xprt_create xprt_args = {
4115 .ident = 0,
4116 .net = clp->cl_net,
4117 };
4118 struct nfs4_add_xprt_data xprtdata = {
4119 .clp = clp,
4120 };
4121 struct rpc_add_xprt_test rpcdata = {
4122 .add_xprt_test = clp->cl_mvops->session_trunk,
4123 .data = &xprtdata,
4124 };
4125 char *servername = NULL;
4126
4127 if (!srv_loc->len)
4128 continue;
4129
4130 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4131 &addr, sizeof(addr),
4132 clp->cl_net, server->port);
4133 if (!addrlen)
4134 return;
4135 xprt_args.dstaddr = (struct sockaddr *)&addr;
4136 xprt_args.addrlen = addrlen;
4137 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4138 if (!servername)
4139 return;
4140 memcpy(servername, srv_loc->data, srv_loc->len);
4141 servername[srv_loc->len] = '\0';
4142 xprt_args.servername = servername;
4143
4144 xprtdata.cred = nfs4_get_clid_cred(clp);
4145 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4146 rpc_clnt_setup_test_and_add_xprt,
4147 &rpcdata);
4148 if (xprtdata.cred)
4149 put_cred(xprtdata.cred);
4150 kfree(servername);
4151 }
4152 }
4153
_is_same_nfs4_pathname(struct nfs4_pathname * path1,struct nfs4_pathname * path2)4154 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4155 struct nfs4_pathname *path2)
4156 {
4157 int i;
4158
4159 if (path1->ncomponents != path2->ncomponents)
4160 return false;
4161 for (i = 0; i < path1->ncomponents; i++) {
4162 if (path1->components[i].len != path2->components[i].len)
4163 return false;
4164 if (memcmp(path1->components[i].data, path2->components[i].data,
4165 path1->components[i].len))
4166 return false;
4167 }
4168 return true;
4169 }
4170
_nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4171 static int _nfs4_discover_trunking(struct nfs_server *server,
4172 struct nfs_fh *fhandle)
4173 {
4174 struct nfs4_fs_locations *locations = NULL;
4175 struct page *page;
4176 const struct cred *cred;
4177 struct nfs_client *clp = server->nfs_client;
4178 const struct nfs4_state_maintenance_ops *ops =
4179 clp->cl_mvops->state_renewal_ops;
4180 int status = -ENOMEM, i;
4181
4182 cred = ops->get_state_renewal_cred(clp);
4183 if (cred == NULL) {
4184 cred = nfs4_get_clid_cred(clp);
4185 if (cred == NULL)
4186 return -ENOKEY;
4187 }
4188
4189 page = alloc_page(GFP_KERNEL);
4190 if (!page)
4191 goto out_put_cred;
4192 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4193 if (!locations)
4194 goto out_free;
4195 locations->fattr = nfs_alloc_fattr();
4196 if (!locations->fattr)
4197 goto out_free_2;
4198
4199 status = nfs4_proc_get_locations(server, fhandle, locations, page,
4200 cred);
4201 if (status)
4202 goto out_free_3;
4203
4204 for (i = 0; i < locations->nlocations; i++) {
4205 if (!_is_same_nfs4_pathname(&locations->fs_path,
4206 &locations->locations[i].rootpath))
4207 continue;
4208 test_fs_location_for_trunking(&locations->locations[i], clp,
4209 server);
4210 }
4211 out_free_3:
4212 kfree(locations->fattr);
4213 out_free_2:
4214 kfree(locations);
4215 out_free:
4216 __free_page(page);
4217 out_put_cred:
4218 put_cred(cred);
4219 return status;
4220 }
4221
nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4222 static int nfs4_discover_trunking(struct nfs_server *server,
4223 struct nfs_fh *fhandle)
4224 {
4225 struct nfs4_exception exception = {
4226 .interruptible = true,
4227 };
4228 struct nfs_client *clp = server->nfs_client;
4229 int err = 0;
4230
4231 if (!nfs4_has_session(clp))
4232 goto out;
4233 do {
4234 err = nfs4_handle_exception(server,
4235 _nfs4_discover_trunking(server, fhandle),
4236 &exception);
4237 } while (exception.retry);
4238 out:
4239 return err;
4240 }
4241
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4242 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4243 struct nfs_fattr *fattr)
4244 {
4245 u32 bitmask[3] = {
4246 [0] = FATTR4_WORD0_TYPE | FATTR4_WORD0_CHANGE |
4247 FATTR4_WORD0_SIZE | FATTR4_WORD0_FSID,
4248 };
4249 struct nfs4_lookup_root_arg args = {
4250 .bitmask = bitmask,
4251 };
4252 struct nfs4_lookup_res res = {
4253 .server = server,
4254 .fattr = fattr,
4255 .fh = fhandle,
4256 };
4257 struct rpc_message msg = {
4258 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4259 .rpc_argp = &args,
4260 .rpc_resp = &res,
4261 };
4262
4263 nfs_fattr_init(fattr);
4264 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4265 }
4266
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4267 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4268 struct nfs_fattr *fattr)
4269 {
4270 struct nfs4_exception exception = {
4271 .interruptible = true,
4272 };
4273 int err;
4274 do {
4275 err = _nfs4_lookup_root(server, fhandle, fattr);
4276 trace_nfs4_lookup_root(server, fhandle, fattr, err);
4277 switch (err) {
4278 case 0:
4279 case -NFS4ERR_WRONGSEC:
4280 goto out;
4281 default:
4282 err = nfs4_handle_exception(server, err, &exception);
4283 }
4284 } while (exception.retry);
4285 out:
4286 return err;
4287 }
4288
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,rpc_authflavor_t flavor)4289 static int nfs4_lookup_root_sec(struct nfs_server *server,
4290 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4291 rpc_authflavor_t flavor)
4292 {
4293 struct rpc_auth_create_args auth_args = {
4294 .pseudoflavor = flavor,
4295 };
4296 struct rpc_auth *auth;
4297
4298 auth = rpcauth_create(&auth_args, server->client);
4299 if (IS_ERR(auth))
4300 return -EACCES;
4301 return nfs4_lookup_root(server, fhandle, fattr);
4302 }
4303
4304 /*
4305 * Retry pseudoroot lookup with various security flavors. We do this when:
4306 *
4307 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4308 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4309 *
4310 * Returns zero on success, or a negative NFS4ERR value, or a
4311 * negative errno value.
4312 */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4313 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4314 struct nfs_fattr *fattr)
4315 {
4316 /* Per 3530bis 15.33.5 */
4317 static const rpc_authflavor_t flav_array[] = {
4318 RPC_AUTH_GSS_KRB5P,
4319 RPC_AUTH_GSS_KRB5I,
4320 RPC_AUTH_GSS_KRB5,
4321 RPC_AUTH_UNIX, /* courtesy */
4322 RPC_AUTH_NULL,
4323 };
4324 int status = -EPERM;
4325 size_t i;
4326
4327 if (server->auth_info.flavor_len > 0) {
4328 /* try each flavor specified by user */
4329 for (i = 0; i < server->auth_info.flavor_len; i++) {
4330 status = nfs4_lookup_root_sec(
4331 server, fhandle, fattr,
4332 server->auth_info.flavors[i]);
4333 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4334 continue;
4335 break;
4336 }
4337 } else {
4338 /* no flavors specified by user, try default list */
4339 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4340 status = nfs4_lookup_root_sec(server, fhandle, fattr,
4341 flav_array[i]);
4342 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4343 continue;
4344 break;
4345 }
4346 }
4347
4348 /*
4349 * -EACCES could mean that the user doesn't have correct permissions
4350 * to access the mount. It could also mean that we tried to mount
4351 * with a gss auth flavor, but rpc.gssd isn't running. Either way,
4352 * existing mount programs don't handle -EACCES very well so it should
4353 * be mapped to -EPERM instead.
4354 */
4355 if (status == -EACCES)
4356 status = -EPERM;
4357 return status;
4358 }
4359
4360 /**
4361 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4362 * @server: initialized nfs_server handle
4363 * @fhandle: we fill in the pseudo-fs root file handle
4364 * @fattr: we fill in a bare bones struct fattr
4365 * @auth_probe: probe the auth flavours
4366 *
4367 * Returns zero on success, or a negative errno.
4368 */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,bool auth_probe)4369 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4370 struct nfs_fattr *fattr, bool auth_probe)
4371 {
4372 int status = 0;
4373
4374 if (!auth_probe)
4375 status = nfs4_lookup_root(server, fhandle, fattr);
4376
4377 if (auth_probe || status == NFS4ERR_WRONGSEC)
4378 status = server->nfs_client->cl_mvops->find_root_sec(
4379 server, fhandle, fattr);
4380
4381 return nfs4_map_errors(status);
4382 }
4383
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4384 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4385 struct nfs_fsinfo *info)
4386 {
4387 int error;
4388 struct nfs_fattr *fattr = info->fattr;
4389
4390 error = nfs4_server_capabilities(server, mntfh);
4391 if (error < 0) {
4392 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4393 return error;
4394 }
4395
4396 error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4397 if (error < 0) {
4398 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4399 goto out;
4400 }
4401
4402 if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4403 !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4404 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4405
4406 out:
4407 return error;
4408 }
4409
4410 /*
4411 * Get locations and (maybe) other attributes of a referral.
4412 * Note that we'll actually follow the referral later when
4413 * we detect fsid mismatch in inode revalidation
4414 */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4415 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4416 const struct qstr *name, struct nfs_fattr *fattr,
4417 struct nfs_fh *fhandle)
4418 {
4419 int status = -ENOMEM;
4420 struct page *page = NULL;
4421 struct nfs4_fs_locations *locations = NULL;
4422
4423 page = alloc_page(GFP_KERNEL);
4424 if (page == NULL)
4425 goto out;
4426 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4427 if (locations == NULL)
4428 goto out;
4429
4430 locations->fattr = fattr;
4431
4432 status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4433 if (status != 0)
4434 goto out;
4435
4436 /*
4437 * If the fsid didn't change, this is a migration event, not a
4438 * referral. Cause us to drop into the exception handler, which
4439 * will kick off migration recovery.
4440 */
4441 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4442 dprintk("%s: server did not return a different fsid for"
4443 " a referral at %s\n", __func__, name->name);
4444 status = -NFS4ERR_MOVED;
4445 goto out;
4446 }
4447 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4448 nfs_fixup_referral_attributes(fattr);
4449 memset(fhandle, 0, sizeof(struct nfs_fh));
4450 out:
4451 if (page)
4452 __free_page(page);
4453 kfree(locations);
4454 return status;
4455 }
4456
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4457 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4458 struct nfs_fattr *fattr, struct inode *inode)
4459 {
4460 __u32 bitmask[NFS4_BITMASK_SZ];
4461 struct nfs4_getattr_arg args = {
4462 .fh = fhandle,
4463 .bitmask = bitmask,
4464 };
4465 struct nfs4_getattr_res res = {
4466 .fattr = fattr,
4467 .server = server,
4468 };
4469 struct rpc_message msg = {
4470 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4471 .rpc_argp = &args,
4472 .rpc_resp = &res,
4473 };
4474 unsigned short task_flags = 0;
4475
4476 if (nfs4_has_session(server->nfs_client))
4477 task_flags = RPC_TASK_MOVEABLE;
4478
4479 /* Is this is an attribute revalidation, subject to softreval? */
4480 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4481 task_flags |= RPC_TASK_TIMEOUT;
4482
4483 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4484 nfs_fattr_init(fattr);
4485 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4486 return nfs4_do_call_sync(server->client, server, &msg,
4487 &args.seq_args, &res.seq_res, task_flags);
4488 }
4489
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4490 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4491 struct nfs_fattr *fattr, struct inode *inode)
4492 {
4493 struct nfs4_exception exception = {
4494 .interruptible = true,
4495 };
4496 int err;
4497 do {
4498 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4499 trace_nfs4_getattr(server, fhandle, fattr, err);
4500 err = nfs4_handle_exception(server, err,
4501 &exception);
4502 } while (exception.retry);
4503 return err;
4504 }
4505
4506 /*
4507 * The file is not closed if it is opened due to the a request to change
4508 * the size of the file. The open call will not be needed once the
4509 * VFS layer lookup-intents are implemented.
4510 *
4511 * Close is called when the inode is destroyed.
4512 * If we haven't opened the file for O_WRONLY, we
4513 * need to in the size_change case to obtain a stateid.
4514 *
4515 * Got race?
4516 * Because OPEN is always done by name in nfsv4, it is
4517 * possible that we opened a different file by the same
4518 * name. We can recognize this race condition, but we
4519 * can't do anything about it besides returning an error.
4520 *
4521 * This will be fixed with VFS changes (lookup-intent).
4522 */
4523 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4524 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4525 struct iattr *sattr)
4526 {
4527 struct inode *inode = d_inode(dentry);
4528 const struct cred *cred = NULL;
4529 struct nfs_open_context *ctx = NULL;
4530 int status;
4531
4532 if (pnfs_ld_layoutret_on_setattr(inode) &&
4533 sattr->ia_valid & ATTR_SIZE &&
4534 sattr->ia_size < i_size_read(inode))
4535 pnfs_commit_and_return_layout(inode);
4536
4537 nfs_fattr_init(fattr);
4538
4539 /* Deal with open(O_TRUNC) */
4540 if (sattr->ia_valid & ATTR_OPEN)
4541 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4542
4543 /* Optimization: if the end result is no change, don't RPC */
4544 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4545 return 0;
4546
4547 /* Search for an existing open(O_WRITE) file */
4548 if (sattr->ia_valid & ATTR_FILE) {
4549
4550 ctx = nfs_file_open_context(sattr->ia_file);
4551 if (ctx)
4552 cred = ctx->cred;
4553 }
4554
4555 /* Return any delegations if we're going to change ACLs */
4556 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4557 nfs4_inode_make_writeable(inode);
4558
4559 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4560 if (status == 0) {
4561 nfs_setattr_update_inode(inode, sattr, fattr);
4562 nfs_setsecurity(inode, fattr);
4563 }
4564 return status;
4565 }
4566
_nfs4_proc_lookup(struct rpc_clnt * clnt,struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4567 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4568 struct dentry *dentry, const struct qstr *name,
4569 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4570 {
4571 struct nfs_server *server = NFS_SERVER(dir);
4572 int status;
4573 struct nfs4_lookup_arg args = {
4574 .bitmask = server->attr_bitmask,
4575 .dir_fh = NFS_FH(dir),
4576 .name = name,
4577 };
4578 struct nfs4_lookup_res res = {
4579 .server = server,
4580 .fattr = fattr,
4581 .fh = fhandle,
4582 };
4583 struct rpc_message msg = {
4584 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4585 .rpc_argp = &args,
4586 .rpc_resp = &res,
4587 };
4588 unsigned short task_flags = 0;
4589
4590 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4591 task_flags = RPC_TASK_MOVEABLE;
4592
4593 /* Is this is an attribute revalidation, subject to softreval? */
4594 if (nfs_lookup_is_soft_revalidate(dentry))
4595 task_flags |= RPC_TASK_TIMEOUT;
4596
4597 args.bitmask = nfs4_bitmask(server, fattr->label);
4598
4599 nfs_fattr_init(fattr);
4600
4601 dprintk("NFS call lookup %pd2\n", dentry);
4602 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4603 status = nfs4_do_call_sync(clnt, server, &msg,
4604 &args.seq_args, &res.seq_res, task_flags);
4605 dprintk("NFS reply lookup: %d\n", status);
4606 return status;
4607 }
4608
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4609 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4610 {
4611 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4612 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4613 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4614 fattr->nlink = 2;
4615 }
4616
nfs4_proc_lookup_common(struct rpc_clnt ** clnt,struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4617 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4618 struct dentry *dentry, const struct qstr *name,
4619 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4620 {
4621 struct nfs4_exception exception = {
4622 .interruptible = true,
4623 };
4624 struct rpc_clnt *client = *clnt;
4625 int err;
4626 do {
4627 err = _nfs4_proc_lookup(client, dir, dentry, name, fhandle, fattr);
4628 trace_nfs4_lookup(dir, name, err);
4629 switch (err) {
4630 case -NFS4ERR_BADNAME:
4631 err = -ENOENT;
4632 goto out;
4633 case -NFS4ERR_MOVED:
4634 err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4635 if (err == -NFS4ERR_MOVED)
4636 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4637 goto out;
4638 case -NFS4ERR_WRONGSEC:
4639 err = -EPERM;
4640 if (client != *clnt)
4641 goto out;
4642 client = nfs4_negotiate_security(client, dir, name);
4643 if (IS_ERR(client))
4644 return PTR_ERR(client);
4645
4646 exception.retry = 1;
4647 break;
4648 default:
4649 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4650 }
4651 } while (exception.retry);
4652
4653 out:
4654 if (err == 0)
4655 *clnt = client;
4656 else if (client != *clnt)
4657 rpc_shutdown_client(client);
4658
4659 return err;
4660 }
4661
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4662 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, const struct qstr *name,
4663 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4664 {
4665 int status;
4666 struct rpc_clnt *client = NFS_CLIENT(dir);
4667
4668 status = nfs4_proc_lookup_common(&client, dir, dentry, name, fhandle, fattr);
4669 if (client != NFS_CLIENT(dir)) {
4670 rpc_shutdown_client(client);
4671 nfs_fixup_secinfo_attributes(fattr);
4672 }
4673 return status;
4674 }
4675
4676 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4677 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4678 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4679 {
4680 struct rpc_clnt *client = NFS_CLIENT(dir);
4681 int status;
4682
4683 status = nfs4_proc_lookup_common(&client, dir, dentry, &dentry->d_name,
4684 fhandle, fattr);
4685 if (status < 0)
4686 return ERR_PTR(status);
4687 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4688 }
4689
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4690 static int _nfs4_proc_lookupp(struct inode *inode,
4691 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4692 {
4693 struct rpc_clnt *clnt = NFS_CLIENT(inode);
4694 struct nfs_server *server = NFS_SERVER(inode);
4695 int status;
4696 struct nfs4_lookupp_arg args = {
4697 .bitmask = server->attr_bitmask,
4698 .fh = NFS_FH(inode),
4699 };
4700 struct nfs4_lookupp_res res = {
4701 .server = server,
4702 .fattr = fattr,
4703 .fh = fhandle,
4704 };
4705 struct rpc_message msg = {
4706 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4707 .rpc_argp = &args,
4708 .rpc_resp = &res,
4709 };
4710 unsigned short task_flags = 0;
4711
4712 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4713 task_flags |= RPC_TASK_TIMEOUT;
4714
4715 args.bitmask = nfs4_bitmask(server, fattr->label);
4716
4717 nfs_fattr_init(fattr);
4718
4719 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino);
4720 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4721 &res.seq_res, task_flags);
4722 dprintk("NFS reply lookupp: %d\n", status);
4723 return status;
4724 }
4725
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4726 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4727 struct nfs_fattr *fattr)
4728 {
4729 struct nfs4_exception exception = {
4730 .interruptible = true,
4731 };
4732 int err;
4733 do {
4734 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4735 trace_nfs4_lookupp(inode, err);
4736 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4737 &exception);
4738 } while (exception.retry);
4739 return err;
4740 }
4741
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4742 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4743 const struct cred *cred)
4744 {
4745 struct nfs_server *server = NFS_SERVER(inode);
4746 struct nfs4_accessargs args = {
4747 .fh = NFS_FH(inode),
4748 .access = entry->mask,
4749 };
4750 struct nfs4_accessres res = {
4751 .server = server,
4752 };
4753 struct rpc_message msg = {
4754 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4755 .rpc_argp = &args,
4756 .rpc_resp = &res,
4757 .rpc_cred = cred,
4758 };
4759 int status = 0;
4760
4761 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
4762 res.fattr = nfs_alloc_fattr();
4763 if (res.fattr == NULL)
4764 return -ENOMEM;
4765 args.bitmask = server->cache_consistency_bitmask;
4766 }
4767 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4768 if (!status) {
4769 nfs_access_set_mask(entry, res.access);
4770 if (res.fattr)
4771 nfs_refresh_inode(inode, res.fattr);
4772 }
4773 nfs_free_fattr(res.fattr);
4774 return status;
4775 }
4776
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4777 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4778 const struct cred *cred)
4779 {
4780 struct nfs4_exception exception = {
4781 .interruptible = true,
4782 };
4783 int err;
4784 do {
4785 err = _nfs4_proc_access(inode, entry, cred);
4786 trace_nfs4_access(inode, err);
4787 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4788 &exception);
4789 } while (exception.retry);
4790 return err;
4791 }
4792
4793 /*
4794 * TODO: For the time being, we don't try to get any attributes
4795 * along with any of the zero-copy operations READ, READDIR,
4796 * READLINK, WRITE.
4797 *
4798 * In the case of the first three, we want to put the GETATTR
4799 * after the read-type operation -- this is because it is hard
4800 * to predict the length of a GETATTR response in v4, and thus
4801 * align the READ data correctly. This means that the GETATTR
4802 * may end up partially falling into the page cache, and we should
4803 * shift it into the 'tail' of the xdr_buf before processing.
4804 * To do this efficiently, we need to know the total length
4805 * of data received, which doesn't seem to be available outside
4806 * of the RPC layer.
4807 *
4808 * In the case of WRITE, we also want to put the GETATTR after
4809 * the operation -- in this case because we want to make sure
4810 * we get the post-operation mtime and size.
4811 *
4812 * Both of these changes to the XDR layer would in fact be quite
4813 * minor, but I decided to leave them for a subsequent patch.
4814 */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4815 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4816 unsigned int pgbase, unsigned int pglen)
4817 {
4818 struct nfs4_readlink args = {
4819 .fh = NFS_FH(inode),
4820 .pgbase = pgbase,
4821 .pglen = pglen,
4822 .pages = &page,
4823 };
4824 struct nfs4_readlink_res res;
4825 struct rpc_message msg = {
4826 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4827 .rpc_argp = &args,
4828 .rpc_resp = &res,
4829 };
4830
4831 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4832 }
4833
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4834 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4835 unsigned int pgbase, unsigned int pglen)
4836 {
4837 struct nfs4_exception exception = {
4838 .interruptible = true,
4839 };
4840 int err;
4841 do {
4842 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4843 trace_nfs4_readlink(inode, err);
4844 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4845 &exception);
4846 } while (exception.retry);
4847 return err;
4848 }
4849
4850 /*
4851 * This is just for mknod. open(O_CREAT) will always do ->open_context().
4852 */
4853 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4854 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4855 int flags)
4856 {
4857 struct nfs_server *server = NFS_SERVER(dir);
4858 struct nfs4_label l, *ilabel;
4859 struct nfs_open_context *ctx;
4860 struct nfs4_state *state;
4861 int status = 0;
4862
4863 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4864 if (IS_ERR(ctx))
4865 return PTR_ERR(ctx);
4866
4867 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4868
4869 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4870 sattr->ia_mode &= ~current_umask();
4871 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4872 if (IS_ERR(state)) {
4873 status = PTR_ERR(state);
4874 goto out;
4875 }
4876 out:
4877 nfs4_label_release_security(ilabel);
4878 put_nfs_open_context(ctx);
4879 return status;
4880 }
4881
4882 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4883 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4884 {
4885 struct nfs_server *server = NFS_SERVER(dir);
4886 struct nfs_removeargs args = {
4887 .fh = NFS_FH(dir),
4888 .name = *name,
4889 };
4890 struct nfs_removeres res = {
4891 .server = server,
4892 };
4893 struct rpc_message msg = {
4894 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4895 .rpc_argp = &args,
4896 .rpc_resp = &res,
4897 };
4898 unsigned long timestamp = jiffies;
4899 int status;
4900
4901 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4902 if (status == 0) {
4903 spin_lock(&dir->i_lock);
4904 /* Removing a directory decrements nlink in the parent */
4905 if (ftype == NF4DIR && dir->i_nlink > 2)
4906 nfs4_dec_nlink_locked(dir);
4907 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4908 NFS_INO_INVALID_DATA);
4909 spin_unlock(&dir->i_lock);
4910 }
4911 return status;
4912 }
4913
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4914 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4915 {
4916 struct nfs4_exception exception = {
4917 .interruptible = true,
4918 };
4919 struct inode *inode = d_inode(dentry);
4920 int err;
4921
4922 if (inode) {
4923 if (inode->i_nlink == 1)
4924 nfs4_inode_return_delegation(inode);
4925 else
4926 nfs4_inode_make_writeable(inode);
4927 }
4928 do {
4929 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4930 trace_nfs4_remove(dir, &dentry->d_name, err);
4931 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4932 &exception);
4933 } while (exception.retry);
4934 return err;
4935 }
4936
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4937 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4938 {
4939 struct nfs4_exception exception = {
4940 .interruptible = true,
4941 };
4942 int err;
4943
4944 do {
4945 err = _nfs4_proc_remove(dir, name, NF4DIR);
4946 trace_nfs4_remove(dir, name, err);
4947 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4948 &exception);
4949 } while (exception.retry);
4950 return err;
4951 }
4952
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)4953 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4954 struct dentry *dentry,
4955 struct inode *inode)
4956 {
4957 struct nfs_removeargs *args = msg->rpc_argp;
4958 struct nfs_removeres *res = msg->rpc_resp;
4959
4960 res->server = NFS_SB(dentry->d_sb);
4961 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4962 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4963
4964 nfs_fattr_init(res->dir_attr);
4965
4966 if (inode) {
4967 nfs4_inode_return_delegation(inode);
4968 nfs_d_prune_case_insensitive_aliases(inode);
4969 }
4970 }
4971
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)4972 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4973 {
4974 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4975 &data->args.seq_args,
4976 &data->res.seq_res,
4977 task);
4978 }
4979
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)4980 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4981 {
4982 struct nfs_unlinkdata *data = task->tk_calldata;
4983 struct nfs_removeres *res = &data->res;
4984
4985 if (!nfs4_sequence_done(task, &res->seq_res))
4986 return 0;
4987 if (nfs4_async_handle_error(task, res->server, NULL,
4988 &data->timeout) == -EAGAIN)
4989 return 0;
4990 if (task->tk_status == 0)
4991 nfs4_update_changeattr(dir, &res->cinfo,
4992 res->dir_attr->time_start,
4993 NFS_INO_INVALID_DATA);
4994 return 1;
4995 }
4996
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)4997 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4998 struct dentry *old_dentry,
4999 struct dentry *new_dentry)
5000 {
5001 struct nfs_renameargs *arg = msg->rpc_argp;
5002 struct nfs_renameres *res = msg->rpc_resp;
5003 struct inode *old_inode = d_inode(old_dentry);
5004 struct inode *new_inode = d_inode(new_dentry);
5005
5006 if (old_inode)
5007 nfs4_inode_make_writeable(old_inode);
5008 if (new_inode)
5009 nfs4_inode_return_delegation(new_inode);
5010 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
5011 res->server = NFS_SB(old_dentry->d_sb);
5012 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
5013 }
5014
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)5015 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
5016 {
5017 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
5018 &data->args.seq_args,
5019 &data->res.seq_res,
5020 task);
5021 }
5022
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)5023 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
5024 struct inode *new_dir)
5025 {
5026 struct nfs_renamedata *data = task->tk_calldata;
5027 struct nfs_renameres *res = &data->res;
5028
5029 if (!nfs4_sequence_done(task, &res->seq_res))
5030 return 0;
5031 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
5032 return 0;
5033
5034 if (task->tk_status == 0) {
5035 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
5036 if (new_dir != old_dir) {
5037 /* Note: If we moved a directory, nlink will change */
5038 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5039 res->old_fattr->time_start,
5040 NFS_INO_INVALID_NLINK |
5041 NFS_INO_INVALID_DATA);
5042 nfs4_update_changeattr(new_dir, &res->new_cinfo,
5043 res->new_fattr->time_start,
5044 NFS_INO_INVALID_NLINK |
5045 NFS_INO_INVALID_DATA);
5046 } else
5047 nfs4_update_changeattr(old_dir, &res->old_cinfo,
5048 res->old_fattr->time_start,
5049 NFS_INO_INVALID_DATA);
5050 }
5051 return 1;
5052 }
5053
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5054 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5055 {
5056 struct nfs_server *server = NFS_SERVER(inode);
5057 __u32 bitmask[NFS4_BITMASK_SZ];
5058 struct nfs4_link_arg arg = {
5059 .fh = NFS_FH(inode),
5060 .dir_fh = NFS_FH(dir),
5061 .name = name,
5062 .bitmask = bitmask,
5063 };
5064 struct nfs4_link_res res = {
5065 .server = server,
5066 };
5067 struct rpc_message msg = {
5068 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
5069 .rpc_argp = &arg,
5070 .rpc_resp = &res,
5071 };
5072 int status = -ENOMEM;
5073
5074 res.fattr = nfs_alloc_fattr_with_label(server);
5075 if (res.fattr == NULL)
5076 goto out;
5077
5078 nfs4_inode_make_writeable(inode);
5079 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label),
5080 inode,
5081 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME);
5082 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5083 if (!status) {
5084 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
5085 NFS_INO_INVALID_DATA);
5086 nfs4_inc_nlink(inode);
5087 status = nfs_post_op_update_inode(inode, res.fattr);
5088 if (!status)
5089 nfs_setsecurity(inode, res.fattr);
5090 }
5091
5092 out:
5093 nfs_free_fattr(res.fattr);
5094 return status;
5095 }
5096
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)5097 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5098 {
5099 struct nfs4_exception exception = {
5100 .interruptible = true,
5101 };
5102 int err;
5103 do {
5104 err = nfs4_handle_exception(NFS_SERVER(inode),
5105 _nfs4_proc_link(inode, dir, name),
5106 &exception);
5107 } while (exception.retry);
5108 return err;
5109 }
5110
5111 struct nfs4_createdata {
5112 struct rpc_message msg;
5113 struct nfs4_create_arg arg;
5114 struct nfs4_create_res res;
5115 struct nfs_fh fh;
5116 struct nfs_fattr fattr;
5117 };
5118
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)5119 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
5120 const struct qstr *name, struct iattr *sattr, u32 ftype)
5121 {
5122 struct nfs4_createdata *data;
5123
5124 data = kzalloc(sizeof(*data), GFP_KERNEL);
5125 if (data != NULL) {
5126 struct nfs_server *server = NFS_SERVER(dir);
5127
5128 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
5129 if (IS_ERR(data->fattr.label))
5130 goto out_free;
5131
5132 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
5133 data->msg.rpc_argp = &data->arg;
5134 data->msg.rpc_resp = &data->res;
5135 data->arg.dir_fh = NFS_FH(dir);
5136 data->arg.server = server;
5137 data->arg.name = name;
5138 data->arg.attrs = sattr;
5139 data->arg.ftype = ftype;
5140 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5141 data->arg.umask = current_umask();
5142 data->res.server = server;
5143 data->res.fh = &data->fh;
5144 data->res.fattr = &data->fattr;
5145 nfs_fattr_init(data->res.fattr);
5146 }
5147 return data;
5148 out_free:
5149 kfree(data);
5150 return NULL;
5151 }
5152
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)5153 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5154 {
5155 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5156 &data->arg.seq_args, &data->res.seq_res, 1);
5157 if (status == 0) {
5158 spin_lock(&dir->i_lock);
5159 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5160 data->res.fattr->time_start,
5161 NFS_INO_INVALID_DATA);
5162 spin_unlock(&dir->i_lock);
5163 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5164 }
5165 return status;
5166 }
5167
nfs4_do_mkdir(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data,int * statusp)5168 static struct dentry *nfs4_do_mkdir(struct inode *dir, struct dentry *dentry,
5169 struct nfs4_createdata *data, int *statusp)
5170 {
5171 struct dentry *ret;
5172
5173 *statusp = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5174 &data->arg.seq_args, &data->res.seq_res, 1);
5175
5176 if (*statusp)
5177 return NULL;
5178
5179 spin_lock(&dir->i_lock);
5180 /* Creating a directory bumps nlink in the parent */
5181 nfs4_inc_nlink_locked(dir);
5182 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5183 data->res.fattr->time_start,
5184 NFS_INO_INVALID_DATA);
5185 spin_unlock(&dir->i_lock);
5186 ret = nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
5187 if (!IS_ERR(ret))
5188 return ret;
5189 *statusp = PTR_ERR(ret);
5190 return NULL;
5191 }
5192
nfs4_free_createdata(struct nfs4_createdata * data)5193 static void nfs4_free_createdata(struct nfs4_createdata *data)
5194 {
5195 nfs4_label_free(data->fattr.label);
5196 kfree(data);
5197 }
5198
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr,struct nfs4_label * label)5199 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5200 struct folio *folio, unsigned int len, struct iattr *sattr,
5201 struct nfs4_label *label)
5202 {
5203 struct page *page = &folio->page;
5204 struct nfs4_createdata *data;
5205 int status = -ENAMETOOLONG;
5206
5207 if (len > NFS4_MAXPATHLEN)
5208 goto out;
5209
5210 status = -ENOMEM;
5211 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5212 if (data == NULL)
5213 goto out;
5214
5215 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5216 data->arg.u.symlink.pages = &page;
5217 data->arg.u.symlink.len = len;
5218 data->arg.label = label;
5219
5220 status = nfs4_do_create(dir, dentry, data);
5221
5222 nfs4_free_createdata(data);
5223 out:
5224 return status;
5225 }
5226
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)5227 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5228 struct folio *folio, unsigned int len, struct iattr *sattr)
5229 {
5230 struct nfs4_exception exception = {
5231 .interruptible = true,
5232 };
5233 struct nfs4_label l, *label;
5234 int err;
5235
5236 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5237
5238 do {
5239 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5240 trace_nfs4_symlink(dir, &dentry->d_name, err);
5241 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5242 &exception);
5243 } while (exception.retry);
5244
5245 nfs4_label_release_security(label);
5246 return err;
5247 }
5248
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,int * statusp)5249 static struct dentry *_nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5250 struct iattr *sattr,
5251 struct nfs4_label *label, int *statusp)
5252 {
5253 struct nfs4_createdata *data;
5254 struct dentry *ret = NULL;
5255
5256 *statusp = -ENOMEM;
5257 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5258 if (data == NULL)
5259 goto out;
5260
5261 data->arg.label = label;
5262 ret = nfs4_do_mkdir(dir, dentry, data, statusp);
5263
5264 nfs4_free_createdata(data);
5265 out:
5266 return ret;
5267 }
5268
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)5269 static struct dentry *nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5270 struct iattr *sattr)
5271 {
5272 struct nfs_server *server = NFS_SERVER(dir);
5273 struct nfs4_exception exception = {
5274 .interruptible = true,
5275 };
5276 struct nfs4_label l, *label;
5277 struct dentry *alias;
5278 int err;
5279
5280 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5281
5282 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5283 sattr->ia_mode &= ~current_umask();
5284 do {
5285 alias = _nfs4_proc_mkdir(dir, dentry, sattr, label, &err);
5286 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5287 if (err)
5288 alias = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
5289 err,
5290 &exception));
5291 } while (exception.retry);
5292 nfs4_label_release_security(label);
5293
5294 return alias;
5295 }
5296
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)5297 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5298 struct nfs_readdir_res *nr_res)
5299 {
5300 struct inode *dir = d_inode(nr_arg->dentry);
5301 struct nfs_server *server = NFS_SERVER(dir);
5302 struct nfs4_readdir_arg args = {
5303 .fh = NFS_FH(dir),
5304 .pages = nr_arg->pages,
5305 .pgbase = 0,
5306 .count = nr_arg->page_len,
5307 .plus = nr_arg->plus,
5308 };
5309 struct nfs4_readdir_res res;
5310 struct rpc_message msg = {
5311 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5312 .rpc_argp = &args,
5313 .rpc_resp = &res,
5314 .rpc_cred = nr_arg->cred,
5315 };
5316 int status;
5317
5318 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5319 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5320 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5321 args.bitmask = server->attr_bitmask_nl;
5322 else
5323 args.bitmask = server->attr_bitmask;
5324
5325 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5326 res.pgbase = args.pgbase;
5327 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5328 &res.seq_res, 0);
5329 if (status >= 0) {
5330 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5331 status += args.pgbase;
5332 }
5333
5334 nfs_invalidate_atime(dir);
5335
5336 dprintk("%s: returns %d\n", __func__, status);
5337 return status;
5338 }
5339
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5340 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5341 struct nfs_readdir_res *res)
5342 {
5343 struct nfs4_exception exception = {
5344 .interruptible = true,
5345 };
5346 int err;
5347 do {
5348 err = _nfs4_proc_readdir(arg, res);
5349 trace_nfs4_readdir(d_inode(arg->dentry), err);
5350 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5351 err, &exception);
5352 } while (exception.retry);
5353 return err;
5354 }
5355
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5356 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5357 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5358 {
5359 struct nfs4_createdata *data;
5360 int mode = sattr->ia_mode;
5361 int status = -ENOMEM;
5362
5363 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5364 if (data == NULL)
5365 goto out;
5366
5367 if (S_ISFIFO(mode))
5368 data->arg.ftype = NF4FIFO;
5369 else if (S_ISBLK(mode)) {
5370 data->arg.ftype = NF4BLK;
5371 data->arg.u.device.specdata1 = MAJOR(rdev);
5372 data->arg.u.device.specdata2 = MINOR(rdev);
5373 }
5374 else if (S_ISCHR(mode)) {
5375 data->arg.ftype = NF4CHR;
5376 data->arg.u.device.specdata1 = MAJOR(rdev);
5377 data->arg.u.device.specdata2 = MINOR(rdev);
5378 } else if (!S_ISSOCK(mode)) {
5379 status = -EINVAL;
5380 goto out_free;
5381 }
5382
5383 data->arg.label = label;
5384 status = nfs4_do_create(dir, dentry, data);
5385 out_free:
5386 nfs4_free_createdata(data);
5387 out:
5388 return status;
5389 }
5390
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5391 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5392 struct iattr *sattr, dev_t rdev)
5393 {
5394 struct nfs_server *server = NFS_SERVER(dir);
5395 struct nfs4_exception exception = {
5396 .interruptible = true,
5397 };
5398 struct nfs4_label l, *label;
5399 int err;
5400
5401 label = nfs4_label_init_security(dir, dentry, sattr, &l);
5402
5403 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5404 sattr->ia_mode &= ~current_umask();
5405 do {
5406 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5407 trace_nfs4_mknod(dir, &dentry->d_name, err);
5408 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5409 &exception);
5410 } while (exception.retry);
5411
5412 nfs4_label_release_security(label);
5413
5414 return err;
5415 }
5416
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5417 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5418 struct nfs_fsstat *fsstat)
5419 {
5420 struct nfs4_statfs_arg args = {
5421 .fh = fhandle,
5422 .bitmask = server->attr_bitmask,
5423 };
5424 struct nfs4_statfs_res res = {
5425 .fsstat = fsstat,
5426 };
5427 struct rpc_message msg = {
5428 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5429 .rpc_argp = &args,
5430 .rpc_resp = &res,
5431 };
5432
5433 nfs_fattr_init(fsstat->fattr);
5434 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5435 }
5436
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5437 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5438 {
5439 struct nfs4_exception exception = {
5440 .interruptible = true,
5441 };
5442 int err;
5443 do {
5444 err = nfs4_handle_exception(server,
5445 _nfs4_proc_statfs(server, fhandle, fsstat),
5446 &exception);
5447 } while (exception.retry);
5448 return err;
5449 }
5450
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5451 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5452 struct nfs_fsinfo *fsinfo)
5453 {
5454 struct nfs4_fsinfo_arg args = {
5455 .fh = fhandle,
5456 .bitmask = server->attr_bitmask,
5457 };
5458 struct nfs4_fsinfo_res res = {
5459 .fsinfo = fsinfo,
5460 };
5461 struct rpc_message msg = {
5462 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5463 .rpc_argp = &args,
5464 .rpc_resp = &res,
5465 };
5466
5467 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5468 }
5469
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5470 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5471 {
5472 struct nfs4_exception exception = {
5473 .interruptible = true,
5474 };
5475 int err;
5476
5477 do {
5478 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5479 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5480 if (err == 0) {
5481 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5482 break;
5483 }
5484 err = nfs4_handle_exception(server, err, &exception);
5485 } while (exception.retry);
5486 return err;
5487 }
5488
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5489 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5490 {
5491 int error;
5492
5493 nfs_fattr_init(fsinfo->fattr);
5494 error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5495 if (error == 0) {
5496 /* block layout checks this! */
5497 server->pnfs_blksize = fsinfo->blksize;
5498 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5499 }
5500
5501 return error;
5502 }
5503
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5504 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5505 struct nfs_pathconf *pathconf)
5506 {
5507 struct nfs4_pathconf_arg args = {
5508 .fh = fhandle,
5509 .bitmask = server->attr_bitmask,
5510 };
5511 struct nfs4_pathconf_res res = {
5512 .pathconf = pathconf,
5513 };
5514 struct rpc_message msg = {
5515 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5516 .rpc_argp = &args,
5517 .rpc_resp = &res,
5518 };
5519
5520 /* None of the pathconf attributes are mandatory to implement */
5521 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5522 memset(pathconf, 0, sizeof(*pathconf));
5523 return 0;
5524 }
5525
5526 nfs_fattr_init(pathconf->fattr);
5527 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5528 }
5529
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5530 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5531 struct nfs_pathconf *pathconf)
5532 {
5533 struct nfs4_exception exception = {
5534 .interruptible = true,
5535 };
5536 int err;
5537
5538 do {
5539 err = nfs4_handle_exception(server,
5540 _nfs4_proc_pathconf(server, fhandle, pathconf),
5541 &exception);
5542 } while (exception.retry);
5543 return err;
5544 }
5545
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5546 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5547 const struct nfs_open_context *ctx,
5548 const struct nfs_lock_context *l_ctx,
5549 fmode_t fmode)
5550 {
5551 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5552 }
5553 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5554
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5555 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5556 const struct nfs_open_context *ctx,
5557 const struct nfs_lock_context *l_ctx,
5558 fmode_t fmode)
5559 {
5560 nfs4_stateid _current_stateid;
5561
5562 /* If the current stateid represents a lost lock, then exit */
5563 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5564 return true;
5565 return nfs4_stateid_match(stateid, &_current_stateid);
5566 }
5567
nfs4_error_stateid_expired(int err)5568 static bool nfs4_error_stateid_expired(int err)
5569 {
5570 switch (err) {
5571 case -NFS4ERR_DELEG_REVOKED:
5572 case -NFS4ERR_ADMIN_REVOKED:
5573 case -NFS4ERR_BAD_STATEID:
5574 case -NFS4ERR_STALE_STATEID:
5575 case -NFS4ERR_OLD_STATEID:
5576 case -NFS4ERR_OPENMODE:
5577 case -NFS4ERR_EXPIRED:
5578 return true;
5579 }
5580 return false;
5581 }
5582
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5583 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5584 {
5585 struct nfs_server *server = NFS_SERVER(hdr->inode);
5586
5587 trace_nfs4_read(hdr, task->tk_status);
5588 if (task->tk_status < 0) {
5589 struct nfs4_exception exception = {
5590 .inode = hdr->inode,
5591 .state = hdr->args.context->state,
5592 .stateid = &hdr->args.stateid,
5593 };
5594 task->tk_status = nfs4_async_handle_exception(task,
5595 server, task->tk_status, &exception);
5596 if (exception.retry) {
5597 rpc_restart_call_prepare(task);
5598 return -EAGAIN;
5599 }
5600 }
5601
5602 if (task->tk_status > 0)
5603 renew_lease(server, hdr->timestamp);
5604 return 0;
5605 }
5606
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5607 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5608 struct nfs_pgio_args *args)
5609 {
5610
5611 if (!nfs4_error_stateid_expired(task->tk_status) ||
5612 nfs4_stateid_is_current(&args->stateid,
5613 args->context,
5614 args->lock_context,
5615 FMODE_READ))
5616 return false;
5617 rpc_restart_call_prepare(task);
5618 return true;
5619 }
5620
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5621 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5622 struct nfs_pgio_header *hdr)
5623 {
5624 struct nfs_server *server = NFS_SERVER(hdr->inode);
5625 struct rpc_message *msg = &task->tk_msg;
5626
5627 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5628 task->tk_status == -ENOTSUPP) {
5629 server->caps &= ~NFS_CAP_READ_PLUS;
5630 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5631 rpc_restart_call_prepare(task);
5632 return true;
5633 }
5634 return false;
5635 }
5636
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5637 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5638 {
5639 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5640 return -EAGAIN;
5641 if (nfs4_read_stateid_changed(task, &hdr->args))
5642 return -EAGAIN;
5643 if (nfs4_read_plus_not_supported(task, hdr))
5644 return -EAGAIN;
5645 if (task->tk_status > 0)
5646 nfs_invalidate_atime(hdr->inode);
5647 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5648 nfs4_read_done_cb(task, hdr);
5649 }
5650
5651 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5652 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5653 struct rpc_message *msg)
5654 {
5655 /* Note: We don't use READ_PLUS with pNFS yet */
5656 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5657 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5658 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5659 }
5660 return false;
5661 }
5662 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5663 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5664 struct rpc_message *msg)
5665 {
5666 return false;
5667 }
5668 #endif /* CONFIG_NFS_V4_2 */
5669
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5670 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5671 struct rpc_message *msg)
5672 {
5673 hdr->timestamp = jiffies;
5674 if (!hdr->pgio_done_cb)
5675 hdr->pgio_done_cb = nfs4_read_done_cb;
5676 if (!nfs42_read_plus_support(hdr, msg))
5677 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5678 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5679 }
5680
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5681 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5682 struct nfs_pgio_header *hdr)
5683 {
5684 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5685 &hdr->args.seq_args,
5686 &hdr->res.seq_res,
5687 task))
5688 return 0;
5689 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5690 hdr->args.lock_context,
5691 hdr->rw_mode) == -EIO)
5692 return -EIO;
5693 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5694 return -EIO;
5695 return 0;
5696 }
5697
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5698 static int nfs4_write_done_cb(struct rpc_task *task,
5699 struct nfs_pgio_header *hdr)
5700 {
5701 struct inode *inode = hdr->inode;
5702
5703 trace_nfs4_write(hdr, task->tk_status);
5704 if (task->tk_status < 0) {
5705 struct nfs4_exception exception = {
5706 .inode = hdr->inode,
5707 .state = hdr->args.context->state,
5708 .stateid = &hdr->args.stateid,
5709 };
5710 task->tk_status = nfs4_async_handle_exception(task,
5711 NFS_SERVER(inode), task->tk_status,
5712 &exception);
5713 if (exception.retry) {
5714 rpc_restart_call_prepare(task);
5715 return -EAGAIN;
5716 }
5717 }
5718 if (task->tk_status >= 0) {
5719 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5720 nfs_writeback_update_inode(hdr);
5721 }
5722 return 0;
5723 }
5724
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5725 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5726 struct nfs_pgio_args *args)
5727 {
5728
5729 if (!nfs4_error_stateid_expired(task->tk_status) ||
5730 nfs4_stateid_is_current(&args->stateid,
5731 args->context,
5732 args->lock_context,
5733 FMODE_WRITE))
5734 return false;
5735 rpc_restart_call_prepare(task);
5736 return true;
5737 }
5738
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5739 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5740 {
5741 if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5742 return -EAGAIN;
5743 if (nfs4_write_stateid_changed(task, &hdr->args))
5744 return -EAGAIN;
5745 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5746 nfs4_write_done_cb(task, hdr);
5747 }
5748
5749 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5750 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5751 {
5752 /* Don't request attributes for pNFS or O_DIRECT writes */
5753 if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5754 return false;
5755 /* Otherwise, request attributes if and only if we don't hold
5756 * a delegation
5757 */
5758 return nfs4_have_delegation(hdr->inode, FMODE_READ, 0) == 0;
5759 }
5760
nfs4_bitmask_set(__u32 bitmask[],const __u32 src[],struct inode * inode,unsigned long cache_validity)5761 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5762 struct inode *inode, unsigned long cache_validity)
5763 {
5764 struct nfs_server *server = NFS_SERVER(inode);
5765 unsigned int i;
5766
5767 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5768 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5769
5770 if (cache_validity & NFS_INO_INVALID_CHANGE)
5771 bitmask[0] |= FATTR4_WORD0_CHANGE;
5772 if (cache_validity & NFS_INO_INVALID_ATIME)
5773 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5774 if (cache_validity & NFS_INO_INVALID_MODE)
5775 bitmask[1] |= FATTR4_WORD1_MODE;
5776 if (cache_validity & NFS_INO_INVALID_OTHER)
5777 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5778 if (cache_validity & NFS_INO_INVALID_NLINK)
5779 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5780 if (cache_validity & NFS_INO_INVALID_CTIME)
5781 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5782 if (cache_validity & NFS_INO_INVALID_MTIME)
5783 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5784 if (cache_validity & NFS_INO_INVALID_BLOCKS)
5785 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5786 if (cache_validity & NFS_INO_INVALID_BTIME)
5787 bitmask[1] |= FATTR4_WORD1_TIME_CREATE;
5788
5789 if (cache_validity & NFS_INO_INVALID_SIZE)
5790 bitmask[0] |= FATTR4_WORD0_SIZE;
5791
5792 for (i = 0; i < NFS4_BITMASK_SZ; i++)
5793 bitmask[i] &= server->attr_bitmask[i];
5794 }
5795
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5796 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5797 struct rpc_message *msg,
5798 struct rpc_clnt **clnt)
5799 {
5800 struct nfs_server *server = NFS_SERVER(hdr->inode);
5801
5802 if (!nfs4_write_need_cache_consistency_data(hdr)) {
5803 hdr->args.bitmask = NULL;
5804 hdr->res.fattr = NULL;
5805 } else {
5806 nfs4_bitmask_set(hdr->args.bitmask_store,
5807 server->cache_consistency_bitmask,
5808 hdr->inode, NFS_INO_INVALID_BLOCKS);
5809 hdr->args.bitmask = hdr->args.bitmask_store;
5810 }
5811
5812 if (!hdr->pgio_done_cb)
5813 hdr->pgio_done_cb = nfs4_write_done_cb;
5814 hdr->res.server = server;
5815 hdr->timestamp = jiffies;
5816
5817 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5818 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5819 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5820 }
5821
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5822 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5823 {
5824 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5825 &data->args.seq_args,
5826 &data->res.seq_res,
5827 task);
5828 }
5829
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5830 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5831 {
5832 struct inode *inode = data->inode;
5833
5834 trace_nfs4_commit(data, task->tk_status);
5835 if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5836 NULL, NULL) == -EAGAIN) {
5837 rpc_restart_call_prepare(task);
5838 return -EAGAIN;
5839 }
5840 return 0;
5841 }
5842
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5843 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5844 {
5845 if (!nfs4_sequence_done(task, &data->res.seq_res))
5846 return -EAGAIN;
5847 return data->commit_done_cb(task, data);
5848 }
5849
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5850 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5851 struct rpc_clnt **clnt)
5852 {
5853 struct nfs_server *server = NFS_SERVER(data->inode);
5854
5855 if (data->commit_done_cb == NULL)
5856 data->commit_done_cb = nfs4_commit_done_cb;
5857 data->res.server = server;
5858 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5859 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5860 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5861 NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5862 }
5863
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5864 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5865 struct nfs_commitres *res)
5866 {
5867 struct inode *dst_inode = file_inode(dst);
5868 struct nfs_server *server = NFS_SERVER(dst_inode);
5869 struct rpc_message msg = {
5870 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5871 .rpc_argp = args,
5872 .rpc_resp = res,
5873 };
5874
5875 args->fh = NFS_FH(dst_inode);
5876 return nfs4_call_sync(server->client, server, &msg,
5877 &args->seq_args, &res->seq_res, 1);
5878 }
5879
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5880 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5881 {
5882 struct nfs_commitargs args = {
5883 .offset = offset,
5884 .count = count,
5885 };
5886 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5887 struct nfs4_exception exception = { };
5888 int status;
5889
5890 do {
5891 status = _nfs4_proc_commit(dst, &args, res);
5892 status = nfs4_handle_exception(dst_server, status, &exception);
5893 } while (exception.retry);
5894
5895 return status;
5896 }
5897
5898 struct nfs4_renewdata {
5899 struct nfs_client *client;
5900 unsigned long timestamp;
5901 };
5902
5903 /*
5904 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5905 * standalone procedure for queueing an asynchronous RENEW.
5906 */
nfs4_renew_release(void * calldata)5907 static void nfs4_renew_release(void *calldata)
5908 {
5909 struct nfs4_renewdata *data = calldata;
5910 struct nfs_client *clp = data->client;
5911
5912 if (refcount_read(&clp->cl_count) > 1)
5913 nfs4_schedule_state_renewal(clp);
5914 nfs_put_client(clp);
5915 kfree(data);
5916 }
5917
nfs4_renew_done(struct rpc_task * task,void * calldata)5918 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5919 {
5920 struct nfs4_renewdata *data = calldata;
5921 struct nfs_client *clp = data->client;
5922 unsigned long timestamp = data->timestamp;
5923
5924 trace_nfs4_renew_async(clp, task->tk_status);
5925 switch (task->tk_status) {
5926 case 0:
5927 break;
5928 case -NFS4ERR_LEASE_MOVED:
5929 nfs4_schedule_lease_moved_recovery(clp);
5930 break;
5931 default:
5932 /* Unless we're shutting down, schedule state recovery! */
5933 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5934 return;
5935 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5936 nfs4_schedule_lease_recovery(clp);
5937 return;
5938 }
5939 nfs4_schedule_path_down_recovery(clp);
5940 }
5941 do_renew_lease(clp, timestamp);
5942 }
5943
5944 static const struct rpc_call_ops nfs4_renew_ops = {
5945 .rpc_call_done = nfs4_renew_done,
5946 .rpc_release = nfs4_renew_release,
5947 };
5948
nfs4_proc_async_renew(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)5949 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5950 {
5951 struct rpc_message msg = {
5952 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5953 .rpc_argp = clp,
5954 .rpc_cred = cred,
5955 };
5956 struct nfs4_renewdata *data;
5957
5958 if (renew_flags == 0)
5959 return 0;
5960 if (!refcount_inc_not_zero(&clp->cl_count))
5961 return -EIO;
5962 data = kmalloc(sizeof(*data), GFP_NOFS);
5963 if (data == NULL) {
5964 nfs_put_client(clp);
5965 return -ENOMEM;
5966 }
5967 data->client = clp;
5968 data->timestamp = jiffies;
5969 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5970 &nfs4_renew_ops, data);
5971 }
5972
nfs4_proc_renew(struct nfs_client * clp,const struct cred * cred)5973 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5974 {
5975 struct rpc_message msg = {
5976 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5977 .rpc_argp = clp,
5978 .rpc_cred = cred,
5979 };
5980 unsigned long now = jiffies;
5981 int status;
5982
5983 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5984 if (status < 0)
5985 return status;
5986 do_renew_lease(clp, now);
5987 return 0;
5988 }
5989
nfs4_server_supports_acls(const struct nfs_server * server,enum nfs4_acl_type type)5990 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5991 enum nfs4_acl_type type)
5992 {
5993 switch (type) {
5994 default:
5995 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5996 case NFS4ACL_DACL:
5997 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5998 case NFS4ACL_SACL:
5999 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
6000 }
6001 }
6002
6003 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
6004 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
6005 * the stack.
6006 */
6007 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
6008
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)6009 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
6010 struct page **pages)
6011 {
6012 struct page *newpage, **spages;
6013 int rc = 0;
6014 size_t len;
6015 spages = pages;
6016
6017 do {
6018 len = min_t(size_t, PAGE_SIZE, buflen);
6019 newpage = alloc_page(GFP_KERNEL);
6020
6021 if (newpage == NULL)
6022 goto unwind;
6023 memcpy(page_address(newpage), buf, len);
6024 buf += len;
6025 buflen -= len;
6026 *pages++ = newpage;
6027 rc++;
6028 } while (buflen != 0);
6029
6030 return rc;
6031
6032 unwind:
6033 for(; rc > 0; rc--)
6034 __free_page(spages[rc-1]);
6035 return -ENOMEM;
6036 }
6037
6038 struct nfs4_cached_acl {
6039 enum nfs4_acl_type type;
6040 int cached;
6041 size_t len;
6042 char data[];
6043 };
6044
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)6045 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
6046 {
6047 struct nfs_inode *nfsi = NFS_I(inode);
6048
6049 spin_lock(&inode->i_lock);
6050 kfree(nfsi->nfs4_acl);
6051 nfsi->nfs4_acl = acl;
6052 spin_unlock(&inode->i_lock);
6053 }
6054
nfs4_zap_acl_attr(struct inode * inode)6055 static void nfs4_zap_acl_attr(struct inode *inode)
6056 {
6057 nfs4_set_cached_acl(inode, NULL);
6058 }
6059
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen,enum nfs4_acl_type type)6060 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
6061 size_t buflen, enum nfs4_acl_type type)
6062 {
6063 struct nfs_inode *nfsi = NFS_I(inode);
6064 struct nfs4_cached_acl *acl;
6065 int ret = -ENOENT;
6066
6067 spin_lock(&inode->i_lock);
6068 acl = nfsi->nfs4_acl;
6069 if (acl == NULL)
6070 goto out;
6071 if (acl->type != type)
6072 goto out;
6073 if (buf == NULL) /* user is just asking for length */
6074 goto out_len;
6075 if (acl->cached == 0)
6076 goto out;
6077 ret = -ERANGE; /* see getxattr(2) man page */
6078 if (acl->len > buflen)
6079 goto out;
6080 memcpy(buf, acl->data, acl->len);
6081 out_len:
6082 ret = acl->len;
6083 out:
6084 spin_unlock(&inode->i_lock);
6085 return ret;
6086 }
6087
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len,enum nfs4_acl_type type)6088 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
6089 size_t pgbase, size_t acl_len,
6090 enum nfs4_acl_type type)
6091 {
6092 struct nfs4_cached_acl *acl;
6093 size_t buflen = sizeof(*acl) + acl_len;
6094
6095 if (buflen <= PAGE_SIZE) {
6096 acl = kmalloc(buflen, GFP_KERNEL);
6097 if (acl == NULL)
6098 goto out;
6099 acl->cached = 1;
6100 _copy_from_pages(acl->data, pages, pgbase, acl_len);
6101 } else {
6102 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
6103 if (acl == NULL)
6104 goto out;
6105 acl->cached = 0;
6106 }
6107 acl->type = type;
6108 acl->len = acl_len;
6109 out:
6110 nfs4_set_cached_acl(inode, acl);
6111 }
6112
6113 /*
6114 * The getxattr API returns the required buffer length when called with a
6115 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
6116 * the required buf. On a NULL buf, we send a page of data to the server
6117 * guessing that the ACL request can be serviced by a page. If so, we cache
6118 * up to the page of ACL data, and the 2nd call to getxattr is serviced by
6119 * the cache. If not so, we throw away the page, and cache the required
6120 * length. The next getxattr call will then produce another round trip to
6121 * the server, this time with the input buf of the required size.
6122 */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6123 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
6124 size_t buflen, enum nfs4_acl_type type)
6125 {
6126 struct page **pages;
6127 struct nfs_getaclargs args = {
6128 .fh = NFS_FH(inode),
6129 .acl_type = type,
6130 .acl_len = buflen,
6131 };
6132 struct nfs_getaclres res = {
6133 .acl_type = type,
6134 .acl_len = buflen,
6135 };
6136 struct rpc_message msg = {
6137 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
6138 .rpc_argp = &args,
6139 .rpc_resp = &res,
6140 };
6141 unsigned int npages;
6142 int ret = -ENOMEM, i;
6143 struct nfs_server *server = NFS_SERVER(inode);
6144
6145 if (buflen == 0)
6146 buflen = server->rsize;
6147
6148 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
6149 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
6150 if (!pages)
6151 return -ENOMEM;
6152
6153 args.acl_pages = pages;
6154
6155 for (i = 0; i < npages; i++) {
6156 pages[i] = alloc_page(GFP_KERNEL);
6157 if (!pages[i])
6158 goto out_free;
6159 }
6160
6161 /* for decoding across pages */
6162 res.acl_scratch = alloc_page(GFP_KERNEL);
6163 if (!res.acl_scratch)
6164 goto out_free;
6165
6166 args.acl_len = npages * PAGE_SIZE;
6167
6168 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
6169 __func__, buf, buflen, npages, args.acl_len);
6170 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6171 &msg, &args.seq_args, &res.seq_res, 0);
6172 if (ret)
6173 goto out_free;
6174
6175 /* Handle the case where the passed-in buffer is too short */
6176 if (res.acl_flags & NFS4_ACL_TRUNC) {
6177 /* Did the user only issue a request for the acl length? */
6178 if (buf == NULL)
6179 goto out_ok;
6180 ret = -ERANGE;
6181 goto out_free;
6182 }
6183 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6184 type);
6185 if (buf) {
6186 if (res.acl_len > buflen) {
6187 ret = -ERANGE;
6188 goto out_free;
6189 }
6190 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6191 }
6192 out_ok:
6193 ret = res.acl_len;
6194 out_free:
6195 while (--i >= 0)
6196 __free_page(pages[i]);
6197 if (res.acl_scratch)
6198 __free_page(res.acl_scratch);
6199 kfree(pages);
6200 return ret;
6201 }
6202
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6203 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6204 size_t buflen, enum nfs4_acl_type type)
6205 {
6206 struct nfs4_exception exception = {
6207 .interruptible = true,
6208 };
6209 ssize_t ret;
6210 do {
6211 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6212 trace_nfs4_get_acl(inode, ret);
6213 if (ret >= 0)
6214 break;
6215 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6216 } while (exception.retry);
6217 return ret;
6218 }
6219
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6220 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6221 enum nfs4_acl_type type)
6222 {
6223 struct nfs_server *server = NFS_SERVER(inode);
6224 int ret;
6225
6226 if (unlikely(NFS_FH(inode)->size == 0))
6227 return -ENODATA;
6228 if (!nfs4_server_supports_acls(server, type))
6229 return -EOPNOTSUPP;
6230 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6231 if (ret < 0)
6232 return ret;
6233 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6234 nfs_zap_acl_cache(inode);
6235 ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6236 if (ret != -ENOENT)
6237 /* -ENOENT is returned if there is no ACL or if there is an ACL
6238 * but no cached acl data, just the acl length */
6239 return ret;
6240 return nfs4_get_acl_uncached(inode, buf, buflen, type);
6241 }
6242
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6243 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6244 size_t buflen, enum nfs4_acl_type type)
6245 {
6246 struct nfs_server *server = NFS_SERVER(inode);
6247 struct page *pages[NFS4ACL_MAXPAGES];
6248 struct nfs_setaclargs arg = {
6249 .fh = NFS_FH(inode),
6250 .acl_type = type,
6251 .acl_len = buflen,
6252 .acl_pages = pages,
6253 };
6254 struct nfs_setaclres res;
6255 struct rpc_message msg = {
6256 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6257 .rpc_argp = &arg,
6258 .rpc_resp = &res,
6259 };
6260 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6261 int ret, i;
6262
6263 /* You can't remove system.nfs4_acl: */
6264 if (buflen == 0)
6265 return -EINVAL;
6266 if (!nfs4_server_supports_acls(server, type))
6267 return -EOPNOTSUPP;
6268 if (npages > ARRAY_SIZE(pages))
6269 return -ERANGE;
6270 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6271 if (i < 0)
6272 return i;
6273 nfs4_inode_make_writeable(inode);
6274 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6275
6276 /*
6277 * Free each page after tx, so the only ref left is
6278 * held by the network stack
6279 */
6280 for (; i > 0; i--)
6281 put_page(pages[i-1]);
6282
6283 /*
6284 * Acl update can result in inode attribute update.
6285 * so mark the attribute cache invalid.
6286 */
6287 spin_lock(&inode->i_lock);
6288 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6289 NFS_INO_INVALID_CTIME |
6290 NFS_INO_REVAL_FORCED);
6291 spin_unlock(&inode->i_lock);
6292 nfs_access_zap_cache(inode);
6293 nfs_zap_acl_cache(inode);
6294 return ret;
6295 }
6296
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6297 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6298 size_t buflen, enum nfs4_acl_type type)
6299 {
6300 struct nfs4_exception exception = { };
6301 int err;
6302
6303 if (unlikely(NFS_FH(inode)->size == 0))
6304 return -ENODATA;
6305 do {
6306 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6307 trace_nfs4_set_acl(inode, err);
6308 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6309 /*
6310 * no need to retry since the kernel
6311 * isn't involved in encoding the ACEs.
6312 */
6313 err = -EINVAL;
6314 break;
6315 }
6316 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6317 &exception);
6318 } while (exception.retry);
6319 return err;
6320 }
6321
6322 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6323 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6324 size_t buflen)
6325 {
6326 struct nfs_server *server = NFS_SERVER(inode);
6327 struct nfs4_label label = {0, 0, 0, buflen, buf};
6328
6329 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6330 struct nfs_fattr fattr = {
6331 .label = &label,
6332 };
6333 struct nfs4_getattr_arg arg = {
6334 .fh = NFS_FH(inode),
6335 .bitmask = bitmask,
6336 };
6337 struct nfs4_getattr_res res = {
6338 .fattr = &fattr,
6339 .server = server,
6340 };
6341 struct rpc_message msg = {
6342 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6343 .rpc_argp = &arg,
6344 .rpc_resp = &res,
6345 };
6346 int ret;
6347
6348 nfs_fattr_init(&fattr);
6349
6350 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6351 if (ret)
6352 return ret;
6353 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6354 return -ENOENT;
6355 return label.len;
6356 }
6357
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6358 static int nfs4_get_security_label(struct inode *inode, void *buf,
6359 size_t buflen)
6360 {
6361 struct nfs4_exception exception = {
6362 .interruptible = true,
6363 };
6364 int err;
6365
6366 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6367 return -EOPNOTSUPP;
6368
6369 do {
6370 err = _nfs4_get_security_label(inode, buf, buflen);
6371 trace_nfs4_get_security_label(inode, err);
6372 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6373 &exception);
6374 } while (exception.retry);
6375 return err;
6376 }
6377
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6378 static int _nfs4_do_set_security_label(struct inode *inode,
6379 struct nfs4_label *ilabel,
6380 struct nfs_fattr *fattr)
6381 {
6382
6383 struct iattr sattr = {0};
6384 struct nfs_server *server = NFS_SERVER(inode);
6385 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6386 struct nfs_setattrargs arg = {
6387 .fh = NFS_FH(inode),
6388 .iap = &sattr,
6389 .server = server,
6390 .bitmask = bitmask,
6391 .label = ilabel,
6392 };
6393 struct nfs_setattrres res = {
6394 .fattr = fattr,
6395 .server = server,
6396 };
6397 struct rpc_message msg = {
6398 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6399 .rpc_argp = &arg,
6400 .rpc_resp = &res,
6401 };
6402 int status;
6403
6404 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6405
6406 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6407 if (status)
6408 dprintk("%s failed: %d\n", __func__, status);
6409
6410 return status;
6411 }
6412
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6413 static int nfs4_do_set_security_label(struct inode *inode,
6414 struct nfs4_label *ilabel,
6415 struct nfs_fattr *fattr)
6416 {
6417 struct nfs4_exception exception = { };
6418 int err;
6419
6420 do {
6421 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6422 trace_nfs4_set_security_label(inode, err);
6423 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6424 &exception);
6425 } while (exception.retry);
6426 return err;
6427 }
6428
6429 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6430 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6431 {
6432 struct nfs4_label ilabel = {0, 0, 0, buflen, (char *)buf };
6433 struct nfs_fattr *fattr;
6434 int status;
6435
6436 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6437 return -EOPNOTSUPP;
6438
6439 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6440 if (fattr == NULL)
6441 return -ENOMEM;
6442
6443 status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6444 if (status == 0)
6445 nfs_setsecurity(inode, fattr);
6446
6447 nfs_free_fattr(fattr);
6448 return status;
6449 }
6450 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
6451
6452
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6453 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6454 nfs4_verifier *bootverf)
6455 {
6456 __be32 verf[2];
6457
6458 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6459 /* An impossible timestamp guarantees this value
6460 * will never match a generated boot time. */
6461 verf[0] = cpu_to_be32(U32_MAX);
6462 verf[1] = cpu_to_be32(U32_MAX);
6463 } else {
6464 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6465 u64 ns = ktime_to_ns(nn->boot_time);
6466
6467 verf[0] = cpu_to_be32(ns >> 32);
6468 verf[1] = cpu_to_be32(ns);
6469 }
6470 memcpy(bootverf->data, verf, sizeof(bootverf->data));
6471 }
6472
6473 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6474 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6475 {
6476 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6477 struct nfs_netns_client *nn_clp = nn->nfs_client;
6478 const char *id;
6479
6480 buf[0] = '\0';
6481
6482 if (nn_clp) {
6483 rcu_read_lock();
6484 id = rcu_dereference(nn_clp->identifier);
6485 if (id)
6486 strscpy(buf, id, buflen);
6487 rcu_read_unlock();
6488 }
6489
6490 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6491 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6492
6493 return strlen(buf);
6494 }
6495
6496 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6497 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6498 {
6499 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6500 size_t buflen;
6501 size_t len;
6502 char *str;
6503
6504 if (clp->cl_owner_id != NULL)
6505 return 0;
6506
6507 rcu_read_lock();
6508 len = 14 +
6509 strlen(clp->cl_rpcclient->cl_nodename) +
6510 1 +
6511 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6512 1;
6513 rcu_read_unlock();
6514
6515 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6516 if (buflen)
6517 len += buflen + 1;
6518
6519 if (len > NFS4_OPAQUE_LIMIT + 1)
6520 return -EINVAL;
6521
6522 /*
6523 * Since this string is allocated at mount time, and held until the
6524 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6525 * about a memory-reclaim deadlock.
6526 */
6527 str = kmalloc(len, GFP_KERNEL);
6528 if (!str)
6529 return -ENOMEM;
6530
6531 rcu_read_lock();
6532 if (buflen)
6533 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6534 clp->cl_rpcclient->cl_nodename, buf,
6535 rpc_peeraddr2str(clp->cl_rpcclient,
6536 RPC_DISPLAY_ADDR));
6537 else
6538 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6539 clp->cl_rpcclient->cl_nodename,
6540 rpc_peeraddr2str(clp->cl_rpcclient,
6541 RPC_DISPLAY_ADDR));
6542 rcu_read_unlock();
6543
6544 clp->cl_owner_id = str;
6545 return 0;
6546 }
6547
6548 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6549 nfs4_init_uniform_client_string(struct nfs_client *clp)
6550 {
6551 char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6552 size_t buflen;
6553 size_t len;
6554 char *str;
6555
6556 if (clp->cl_owner_id != NULL)
6557 return 0;
6558
6559 len = 10 + 10 + 1 + 10 + 1 +
6560 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6561
6562 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6563 if (buflen)
6564 len += buflen + 1;
6565
6566 if (len > NFS4_OPAQUE_LIMIT + 1)
6567 return -EINVAL;
6568
6569 /*
6570 * Since this string is allocated at mount time, and held until the
6571 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6572 * about a memory-reclaim deadlock.
6573 */
6574 str = kmalloc(len, GFP_KERNEL);
6575 if (!str)
6576 return -ENOMEM;
6577
6578 if (buflen)
6579 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6580 clp->rpc_ops->version, clp->cl_minorversion,
6581 buf, clp->cl_rpcclient->cl_nodename);
6582 else
6583 scnprintf(str, len, "Linux NFSv%u.%u %s",
6584 clp->rpc_ops->version, clp->cl_minorversion,
6585 clp->cl_rpcclient->cl_nodename);
6586 clp->cl_owner_id = str;
6587 return 0;
6588 }
6589
6590 /*
6591 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6592 * services. Advertise one based on the address family of the
6593 * clientaddr.
6594 */
6595 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6596 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6597 {
6598 if (strchr(clp->cl_ipaddr, ':') != NULL)
6599 return scnprintf(buf, len, "tcp6");
6600 else
6601 return scnprintf(buf, len, "tcp");
6602 }
6603
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6604 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6605 {
6606 struct nfs4_setclientid *sc = calldata;
6607
6608 if (task->tk_status == 0)
6609 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6610 }
6611
6612 static const struct rpc_call_ops nfs4_setclientid_ops = {
6613 .rpc_call_done = nfs4_setclientid_done,
6614 };
6615
6616 /**
6617 * nfs4_proc_setclientid - Negotiate client ID
6618 * @clp: state data structure
6619 * @program: RPC program for NFSv4 callback service
6620 * @port: IP port number for NFS4 callback service
6621 * @cred: credential to use for this call
6622 * @res: where to place the result
6623 *
6624 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6625 */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6626 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6627 unsigned short port, const struct cred *cred,
6628 struct nfs4_setclientid_res *res)
6629 {
6630 nfs4_verifier sc_verifier;
6631 struct nfs4_setclientid setclientid = {
6632 .sc_verifier = &sc_verifier,
6633 .sc_prog = program,
6634 .sc_clnt = clp,
6635 };
6636 struct rpc_message msg = {
6637 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6638 .rpc_argp = &setclientid,
6639 .rpc_resp = res,
6640 .rpc_cred = cred,
6641 };
6642 struct rpc_task_setup task_setup_data = {
6643 .rpc_client = clp->cl_rpcclient,
6644 .rpc_message = &msg,
6645 .callback_ops = &nfs4_setclientid_ops,
6646 .callback_data = &setclientid,
6647 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6648 };
6649 unsigned long now = jiffies;
6650 int status;
6651
6652 /* nfs_client_id4 */
6653 nfs4_init_boot_verifier(clp, &sc_verifier);
6654
6655 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6656 status = nfs4_init_uniform_client_string(clp);
6657 else
6658 status = nfs4_init_nonuniform_client_string(clp);
6659
6660 if (status)
6661 goto out;
6662
6663 /* cb_client4 */
6664 setclientid.sc_netid_len =
6665 nfs4_init_callback_netid(clp,
6666 setclientid.sc_netid,
6667 sizeof(setclientid.sc_netid));
6668 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6669 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6670 clp->cl_ipaddr, port >> 8, port & 255);
6671
6672 dprintk("NFS call setclientid auth=%s, '%s'\n",
6673 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6674 clp->cl_owner_id);
6675
6676 status = nfs4_call_sync_custom(&task_setup_data);
6677 if (setclientid.sc_cred) {
6678 kfree(clp->cl_acceptor);
6679 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6680 put_rpccred(setclientid.sc_cred);
6681 }
6682
6683 if (status == 0)
6684 do_renew_lease(clp, now);
6685 out:
6686 trace_nfs4_setclientid(clp, status);
6687 dprintk("NFS reply setclientid: %d\n", status);
6688 return status;
6689 }
6690
6691 /**
6692 * nfs4_proc_setclientid_confirm - Confirm client ID
6693 * @clp: state data structure
6694 * @arg: result of a previous SETCLIENTID
6695 * @cred: credential to use for this call
6696 *
6697 * Returns zero, a negative errno, or a negative NFS4ERR status code.
6698 */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6699 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6700 struct nfs4_setclientid_res *arg,
6701 const struct cred *cred)
6702 {
6703 struct rpc_message msg = {
6704 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6705 .rpc_argp = arg,
6706 .rpc_cred = cred,
6707 };
6708 int status;
6709
6710 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
6711 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6712 clp->cl_clientid);
6713 status = rpc_call_sync(clp->cl_rpcclient, &msg,
6714 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6715 trace_nfs4_setclientid_confirm(clp, status);
6716 dprintk("NFS reply setclientid_confirm: %d\n", status);
6717 return status;
6718 }
6719
6720 struct nfs4_delegreturndata {
6721 struct nfs4_delegreturnargs args;
6722 struct nfs4_delegreturnres res;
6723 struct nfs_fh fh;
6724 nfs4_stateid stateid;
6725 unsigned long timestamp;
6726 struct {
6727 struct nfs4_layoutreturn_args arg;
6728 struct nfs4_layoutreturn_res res;
6729 struct nfs4_xdr_opaque_data ld_private;
6730 u32 roc_barrier;
6731 bool roc;
6732 } lr;
6733 struct nfs4_delegattr sattr;
6734 struct nfs_fattr fattr;
6735 int rpc_status;
6736 struct inode *inode;
6737 };
6738
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6739 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6740 {
6741 struct nfs4_delegreturndata *data = calldata;
6742 struct nfs4_exception exception = {
6743 .inode = data->inode,
6744 .stateid = &data->stateid,
6745 .task_is_privileged = data->args.seq_args.sa_privileged,
6746 };
6747
6748 if (!nfs4_sequence_done(task, &data->res.seq_res))
6749 return;
6750
6751 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6752
6753 /* Handle Layoutreturn errors */
6754 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6755 &data->res.lr_ret) == -EAGAIN)
6756 goto out_restart;
6757
6758 if (data->args.sattr_args && task->tk_status != 0) {
6759 switch(data->res.sattr_ret) {
6760 case 0:
6761 data->args.sattr_args = NULL;
6762 data->res.sattr_res = false;
6763 break;
6764 case -NFS4ERR_ADMIN_REVOKED:
6765 case -NFS4ERR_DELEG_REVOKED:
6766 case -NFS4ERR_EXPIRED:
6767 case -NFS4ERR_BAD_STATEID:
6768 /* Let the main handler below do stateid recovery */
6769 break;
6770 case -NFS4ERR_OLD_STATEID:
6771 if (nfs4_refresh_delegation_stateid(&data->stateid,
6772 data->inode))
6773 goto out_restart;
6774 fallthrough;
6775 default:
6776 data->args.sattr_args = NULL;
6777 data->res.sattr_res = false;
6778 goto out_restart;
6779 }
6780 }
6781
6782 switch (task->tk_status) {
6783 case 0:
6784 renew_lease(data->res.server, data->timestamp);
6785 break;
6786 case -NFS4ERR_ADMIN_REVOKED:
6787 case -NFS4ERR_DELEG_REVOKED:
6788 case -NFS4ERR_EXPIRED:
6789 nfs4_free_revoked_stateid(data->res.server,
6790 data->args.stateid,
6791 task->tk_msg.rpc_cred);
6792 fallthrough;
6793 case -NFS4ERR_BAD_STATEID:
6794 case -NFS4ERR_STALE_STATEID:
6795 case -ETIMEDOUT:
6796 task->tk_status = 0;
6797 break;
6798 case -NFS4ERR_OLD_STATEID:
6799 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6800 nfs4_stateid_seqid_inc(&data->stateid);
6801 if (data->args.bitmask) {
6802 data->args.bitmask = NULL;
6803 data->res.fattr = NULL;
6804 }
6805 goto out_restart;
6806 case -NFS4ERR_ACCESS:
6807 if (data->args.bitmask) {
6808 data->args.bitmask = NULL;
6809 data->res.fattr = NULL;
6810 goto out_restart;
6811 }
6812 fallthrough;
6813 default:
6814 task->tk_status = nfs4_async_handle_exception(task,
6815 data->res.server, task->tk_status,
6816 &exception);
6817 if (exception.retry)
6818 goto out_restart;
6819 }
6820 nfs_delegation_mark_returned(data->inode, data->args.stateid);
6821 data->rpc_status = task->tk_status;
6822 return;
6823 out_restart:
6824 task->tk_status = 0;
6825 rpc_restart_call_prepare(task);
6826 }
6827
nfs4_delegreturn_release(void * calldata)6828 static void nfs4_delegreturn_release(void *calldata)
6829 {
6830 struct nfs4_delegreturndata *data = calldata;
6831 struct inode *inode = data->inode;
6832
6833 if (data->lr.roc)
6834 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6835 data->res.lr_ret);
6836 if (inode) {
6837 nfs4_fattr_set_prechange(&data->fattr,
6838 inode_peek_iversion_raw(inode));
6839 nfs_refresh_inode(inode, &data->fattr);
6840 nfs_iput_and_deactive(inode);
6841 }
6842 kfree(calldata);
6843 }
6844
nfs4_delegreturn_prepare(struct rpc_task * task,void * data)6845 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6846 {
6847 struct nfs4_delegreturndata *d_data;
6848 struct pnfs_layout_hdr *lo;
6849
6850 d_data = data;
6851
6852 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6853 nfs4_sequence_done(task, &d_data->res.seq_res);
6854 return;
6855 }
6856
6857 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6858 if (lo && !pnfs_layout_is_valid(lo)) {
6859 d_data->args.lr_args = NULL;
6860 d_data->res.lr_res = NULL;
6861 }
6862
6863 nfs4_setup_sequence(d_data->res.server->nfs_client,
6864 &d_data->args.seq_args,
6865 &d_data->res.seq_res,
6866 task);
6867 }
6868
6869 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6870 .rpc_call_prepare = nfs4_delegreturn_prepare,
6871 .rpc_call_done = nfs4_delegreturn_done,
6872 .rpc_release = nfs4_delegreturn_release,
6873 };
6874
_nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6875 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6876 const nfs4_stateid *stateid,
6877 struct nfs_delegation *delegation,
6878 int issync)
6879 {
6880 struct nfs4_delegreturndata *data;
6881 struct nfs_server *server = NFS_SERVER(inode);
6882 struct rpc_task *task;
6883 struct rpc_message msg = {
6884 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6885 .rpc_cred = cred,
6886 };
6887 struct rpc_task_setup task_setup_data = {
6888 .rpc_client = server->client,
6889 .rpc_message = &msg,
6890 .callback_ops = &nfs4_delegreturn_ops,
6891 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6892 };
6893 int status = 0;
6894
6895 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6896 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6897
6898 data = kzalloc(sizeof(*data), GFP_KERNEL);
6899 if (data == NULL)
6900 return -ENOMEM;
6901
6902 nfs4_state_protect(server->nfs_client,
6903 NFS_SP4_MACH_CRED_CLEANUP,
6904 &task_setup_data.rpc_client, &msg);
6905
6906 data->args.fhandle = &data->fh;
6907 data->args.stateid = &data->stateid;
6908 nfs4_bitmask_set(data->args.bitmask_store,
6909 server->cache_consistency_bitmask, inode, 0);
6910 data->args.bitmask = data->args.bitmask_store;
6911 nfs_copy_fh(&data->fh, NFS_FH(inode));
6912 nfs4_stateid_copy(&data->stateid, stateid);
6913 data->res.fattr = &data->fattr;
6914 data->res.server = server;
6915 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6916 data->lr.arg.ld_private = &data->lr.ld_private;
6917 nfs_fattr_init(data->res.fattr);
6918 data->timestamp = jiffies;
6919 data->rpc_status = 0;
6920 data->inode = nfs_igrab_and_active(inode);
6921 if (data->inode || issync) {
6922 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6923 cred);
6924 if (data->lr.roc) {
6925 data->args.lr_args = &data->lr.arg;
6926 data->res.lr_res = &data->lr.res;
6927 }
6928 }
6929
6930 if (delegation &&
6931 test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) {
6932 if (delegation->type & FMODE_READ) {
6933 data->sattr.atime = inode_get_atime(inode);
6934 data->sattr.atime_set = true;
6935 }
6936 if (delegation->type & FMODE_WRITE) {
6937 data->sattr.mtime = inode_get_mtime(inode);
6938 data->sattr.mtime_set = true;
6939 }
6940 data->args.sattr_args = &data->sattr;
6941 data->res.sattr_res = true;
6942 }
6943
6944 if (!data->inode)
6945 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6946 1);
6947 else
6948 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6949 0);
6950
6951 task_setup_data.callback_data = data;
6952 msg.rpc_argp = &data->args;
6953 msg.rpc_resp = &data->res;
6954 task = rpc_run_task(&task_setup_data);
6955 if (IS_ERR(task))
6956 return PTR_ERR(task);
6957 if (!issync)
6958 goto out;
6959 status = rpc_wait_for_completion_task(task);
6960 if (status != 0)
6961 goto out;
6962 status = data->rpc_status;
6963 out:
6964 rpc_put_task(task);
6965 return status;
6966 }
6967
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,struct nfs_delegation * delegation,int issync)6968 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6969 const nfs4_stateid *stateid,
6970 struct nfs_delegation *delegation, int issync)
6971 {
6972 struct nfs_server *server = NFS_SERVER(inode);
6973 struct nfs4_exception exception = { };
6974 int err;
6975 do {
6976 err = _nfs4_proc_delegreturn(inode, cred, stateid,
6977 delegation, issync);
6978 trace_nfs4_delegreturn(inode, stateid, err);
6979 switch (err) {
6980 case -NFS4ERR_STALE_STATEID:
6981 case -NFS4ERR_EXPIRED:
6982 case 0:
6983 return 0;
6984 }
6985 err = nfs4_handle_exception(server, err, &exception);
6986 } while (exception.retry);
6987 return err;
6988 }
6989
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6990 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6991 {
6992 struct inode *inode = state->inode;
6993 struct nfs_server *server = NFS_SERVER(inode);
6994 struct nfs_client *clp = server->nfs_client;
6995 struct nfs_lockt_args arg = {
6996 .fh = NFS_FH(inode),
6997 .fl = request,
6998 };
6999 struct nfs_lockt_res res = {
7000 .denied = request,
7001 };
7002 struct rpc_message msg = {
7003 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
7004 .rpc_argp = &arg,
7005 .rpc_resp = &res,
7006 .rpc_cred = state->owner->so_cred,
7007 };
7008 struct nfs4_lock_state *lsp;
7009 int status;
7010
7011 arg.lock_owner.clientid = clp->cl_clientid;
7012 status = nfs4_set_lock_state(state, request);
7013 if (status != 0)
7014 goto out;
7015 lsp = request->fl_u.nfs4_fl.owner;
7016 arg.lock_owner.id = lsp->ls_seqid.owner_id;
7017 arg.lock_owner.s_dev = server->s_dev;
7018 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
7019 switch (status) {
7020 case 0:
7021 request->c.flc_type = F_UNLCK;
7022 break;
7023 case -NFS4ERR_DENIED:
7024 status = 0;
7025 }
7026 request->fl_ops->fl_release_private(request);
7027 request->fl_ops = NULL;
7028 out:
7029 return status;
7030 }
7031
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)7032 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7033 {
7034 struct nfs4_exception exception = {
7035 .interruptible = true,
7036 };
7037 int err;
7038
7039 do {
7040 err = _nfs4_proc_getlk(state, cmd, request);
7041 trace_nfs4_get_lock(request, state, cmd, err);
7042 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
7043 &exception);
7044 } while (exception.retry);
7045 return err;
7046 }
7047
7048 /*
7049 * Update the seqid of a lock stateid after receiving
7050 * NFS4ERR_OLD_STATEID
7051 */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)7052 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
7053 struct nfs4_lock_state *lsp)
7054 {
7055 struct nfs4_state *state = lsp->ls_state;
7056 bool ret = false;
7057
7058 spin_lock(&state->state_lock);
7059 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
7060 goto out;
7061 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
7062 nfs4_stateid_seqid_inc(dst);
7063 else
7064 dst->seqid = lsp->ls_stateid.seqid;
7065 ret = true;
7066 out:
7067 spin_unlock(&state->state_lock);
7068 return ret;
7069 }
7070
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)7071 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
7072 struct nfs4_lock_state *lsp)
7073 {
7074 struct nfs4_state *state = lsp->ls_state;
7075 bool ret;
7076
7077 spin_lock(&state->state_lock);
7078 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
7079 nfs4_stateid_copy(dst, &lsp->ls_stateid);
7080 spin_unlock(&state->state_lock);
7081 return ret;
7082 }
7083
7084 struct nfs4_unlockdata {
7085 struct nfs_locku_args arg;
7086 struct nfs_locku_res res;
7087 struct nfs4_lock_state *lsp;
7088 struct nfs_open_context *ctx;
7089 struct nfs_lock_context *l_ctx;
7090 struct file_lock fl;
7091 struct nfs_server *server;
7092 unsigned long timestamp;
7093 };
7094
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7095 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
7096 struct nfs_open_context *ctx,
7097 struct nfs4_lock_state *lsp,
7098 struct nfs_seqid *seqid)
7099 {
7100 struct nfs4_unlockdata *p;
7101 struct nfs4_state *state = lsp->ls_state;
7102 struct inode *inode = state->inode;
7103 struct nfs_lock_context *l_ctx;
7104
7105 p = kzalloc(sizeof(*p), GFP_KERNEL);
7106 if (p == NULL)
7107 return NULL;
7108 l_ctx = nfs_get_lock_context(ctx);
7109 if (!IS_ERR(l_ctx)) {
7110 p->l_ctx = l_ctx;
7111 } else {
7112 kfree(p);
7113 return NULL;
7114 }
7115 p->arg.fh = NFS_FH(inode);
7116 p->arg.fl = &p->fl;
7117 p->arg.seqid = seqid;
7118 p->res.seqid = seqid;
7119 p->lsp = lsp;
7120 /* Ensure we don't close file until we're done freeing locks! */
7121 p->ctx = get_nfs_open_context(ctx);
7122 locks_init_lock(&p->fl);
7123 locks_copy_lock(&p->fl, fl);
7124 p->server = NFS_SERVER(inode);
7125 spin_lock(&state->state_lock);
7126 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
7127 spin_unlock(&state->state_lock);
7128 return p;
7129 }
7130
nfs4_locku_release_calldata(void * data)7131 static void nfs4_locku_release_calldata(void *data)
7132 {
7133 struct nfs4_unlockdata *calldata = data;
7134 nfs_free_seqid(calldata->arg.seqid);
7135 nfs4_put_lock_state(calldata->lsp);
7136 nfs_put_lock_context(calldata->l_ctx);
7137 put_nfs_open_context(calldata->ctx);
7138 kfree(calldata);
7139 }
7140
nfs4_locku_done(struct rpc_task * task,void * data)7141 static void nfs4_locku_done(struct rpc_task *task, void *data)
7142 {
7143 struct nfs4_unlockdata *calldata = data;
7144 struct nfs4_exception exception = {
7145 .inode = calldata->lsp->ls_state->inode,
7146 .stateid = &calldata->arg.stateid,
7147 };
7148
7149 if (!nfs4_sequence_done(task, &calldata->res.seq_res))
7150 return;
7151 switch (task->tk_status) {
7152 case 0:
7153 renew_lease(calldata->server, calldata->timestamp);
7154 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
7155 if (nfs4_update_lock_stateid(calldata->lsp,
7156 &calldata->res.stateid))
7157 break;
7158 fallthrough;
7159 case -NFS4ERR_ADMIN_REVOKED:
7160 case -NFS4ERR_EXPIRED:
7161 nfs4_free_revoked_stateid(calldata->server,
7162 &calldata->arg.stateid,
7163 task->tk_msg.rpc_cred);
7164 fallthrough;
7165 case -NFS4ERR_BAD_STATEID:
7166 case -NFS4ERR_STALE_STATEID:
7167 if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
7168 calldata->lsp))
7169 rpc_restart_call_prepare(task);
7170 break;
7171 case -NFS4ERR_OLD_STATEID:
7172 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
7173 calldata->lsp))
7174 rpc_restart_call_prepare(task);
7175 break;
7176 default:
7177 task->tk_status = nfs4_async_handle_exception(task,
7178 calldata->server, task->tk_status,
7179 &exception);
7180 if (exception.retry)
7181 rpc_restart_call_prepare(task);
7182 }
7183 nfs_release_seqid(calldata->arg.seqid);
7184 }
7185
nfs4_locku_prepare(struct rpc_task * task,void * data)7186 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
7187 {
7188 struct nfs4_unlockdata *calldata = data;
7189
7190 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
7191 nfs_async_iocounter_wait(task, calldata->l_ctx))
7192 return;
7193
7194 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
7195 goto out_wait;
7196 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
7197 /* Note: exit _without_ running nfs4_locku_done */
7198 goto out_no_action;
7199 }
7200 calldata->timestamp = jiffies;
7201 if (nfs4_setup_sequence(calldata->server->nfs_client,
7202 &calldata->arg.seq_args,
7203 &calldata->res.seq_res,
7204 task) != 0)
7205 nfs_release_seqid(calldata->arg.seqid);
7206 return;
7207 out_no_action:
7208 task->tk_action = NULL;
7209 out_wait:
7210 nfs4_sequence_done(task, &calldata->res.seq_res);
7211 }
7212
7213 static const struct rpc_call_ops nfs4_locku_ops = {
7214 .rpc_call_prepare = nfs4_locku_prepare,
7215 .rpc_call_done = nfs4_locku_done,
7216 .rpc_release = nfs4_locku_release_calldata,
7217 };
7218
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)7219 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
7220 struct nfs_open_context *ctx,
7221 struct nfs4_lock_state *lsp,
7222 struct nfs_seqid *seqid)
7223 {
7224 struct nfs4_unlockdata *data;
7225 struct rpc_message msg = {
7226 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
7227 .rpc_cred = ctx->cred,
7228 };
7229 struct rpc_task_setup task_setup_data = {
7230 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7231 .rpc_message = &msg,
7232 .callback_ops = &nfs4_locku_ops,
7233 .workqueue = nfsiod_workqueue,
7234 .flags = RPC_TASK_ASYNC,
7235 };
7236
7237 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7238 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7239
7240 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7241 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7242
7243 /* Ensure this is an unlock - when canceling a lock, the
7244 * canceled lock is passed in, and it won't be an unlock.
7245 */
7246 fl->c.flc_type = F_UNLCK;
7247 if (fl->c.flc_flags & FL_CLOSE)
7248 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7249
7250 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7251 if (data == NULL) {
7252 nfs_free_seqid(seqid);
7253 return ERR_PTR(-ENOMEM);
7254 }
7255
7256 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7257 msg.rpc_argp = &data->arg;
7258 msg.rpc_resp = &data->res;
7259 task_setup_data.callback_data = data;
7260 return rpc_run_task(&task_setup_data);
7261 }
7262
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)7263 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7264 {
7265 struct inode *inode = state->inode;
7266 struct nfs4_state_owner *sp = state->owner;
7267 struct nfs_inode *nfsi = NFS_I(inode);
7268 struct nfs_seqid *seqid;
7269 struct nfs4_lock_state *lsp;
7270 struct rpc_task *task;
7271 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7272 int status = 0;
7273 unsigned char saved_flags = request->c.flc_flags;
7274
7275 status = nfs4_set_lock_state(state, request);
7276 /* Unlock _before_ we do the RPC call */
7277 request->c.flc_flags |= FL_EXISTS;
7278 /* Exclude nfs_delegation_claim_locks() */
7279 mutex_lock(&sp->so_delegreturn_mutex);
7280 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7281 down_read(&nfsi->rwsem);
7282 if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7283 up_read(&nfsi->rwsem);
7284 mutex_unlock(&sp->so_delegreturn_mutex);
7285 goto out;
7286 }
7287 lsp = request->fl_u.nfs4_fl.owner;
7288 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7289 up_read(&nfsi->rwsem);
7290 mutex_unlock(&sp->so_delegreturn_mutex);
7291 if (status != 0)
7292 goto out;
7293 /* Is this a delegated lock? */
7294 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7295 goto out;
7296 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7297 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7298 status = -ENOMEM;
7299 if (IS_ERR(seqid))
7300 goto out;
7301 task = nfs4_do_unlck(request,
7302 nfs_file_open_context(request->c.flc_file),
7303 lsp, seqid);
7304 status = PTR_ERR(task);
7305 if (IS_ERR(task))
7306 goto out;
7307 status = rpc_wait_for_completion_task(task);
7308 rpc_put_task(task);
7309 out:
7310 request->c.flc_flags = saved_flags;
7311 trace_nfs4_unlock(request, state, F_SETLK, status);
7312 return status;
7313 }
7314
7315 struct nfs4_lockdata {
7316 struct nfs_lock_args arg;
7317 struct nfs_lock_res res;
7318 struct nfs4_lock_state *lsp;
7319 struct nfs_open_context *ctx;
7320 struct file_lock fl;
7321 unsigned long timestamp;
7322 int rpc_status;
7323 int cancelled;
7324 struct nfs_server *server;
7325 };
7326
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)7327 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7328 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7329 gfp_t gfp_mask)
7330 {
7331 struct nfs4_lockdata *p;
7332 struct inode *inode = lsp->ls_state->inode;
7333 struct nfs_server *server = NFS_SERVER(inode);
7334 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7335
7336 p = kzalloc(sizeof(*p), gfp_mask);
7337 if (p == NULL)
7338 return NULL;
7339
7340 p->arg.fh = NFS_FH(inode);
7341 p->arg.fl = &p->fl;
7342 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7343 if (IS_ERR(p->arg.open_seqid))
7344 goto out_free;
7345 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7346 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7347 if (IS_ERR(p->arg.lock_seqid))
7348 goto out_free_seqid;
7349 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7350 p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7351 p->arg.lock_owner.s_dev = server->s_dev;
7352 p->res.lock_seqid = p->arg.lock_seqid;
7353 p->lsp = lsp;
7354 p->server = server;
7355 p->ctx = get_nfs_open_context(ctx);
7356 locks_init_lock(&p->fl);
7357 locks_copy_lock(&p->fl, fl);
7358 return p;
7359 out_free_seqid:
7360 nfs_free_seqid(p->arg.open_seqid);
7361 out_free:
7362 kfree(p);
7363 return NULL;
7364 }
7365
nfs4_lock_prepare(struct rpc_task * task,void * calldata)7366 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7367 {
7368 struct nfs4_lockdata *data = calldata;
7369 struct nfs4_state *state = data->lsp->ls_state;
7370
7371 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7372 goto out_wait;
7373 /* Do we need to do an open_to_lock_owner? */
7374 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7375 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7376 goto out_release_lock_seqid;
7377 }
7378 nfs4_stateid_copy(&data->arg.open_stateid,
7379 &state->open_stateid);
7380 data->arg.new_lock_owner = 1;
7381 data->res.open_seqid = data->arg.open_seqid;
7382 } else {
7383 data->arg.new_lock_owner = 0;
7384 nfs4_stateid_copy(&data->arg.lock_stateid,
7385 &data->lsp->ls_stateid);
7386 }
7387 if (!nfs4_valid_open_stateid(state)) {
7388 data->rpc_status = -EBADF;
7389 task->tk_action = NULL;
7390 goto out_release_open_seqid;
7391 }
7392 data->timestamp = jiffies;
7393 if (nfs4_setup_sequence(data->server->nfs_client,
7394 &data->arg.seq_args,
7395 &data->res.seq_res,
7396 task) == 0)
7397 return;
7398 out_release_open_seqid:
7399 nfs_release_seqid(data->arg.open_seqid);
7400 out_release_lock_seqid:
7401 nfs_release_seqid(data->arg.lock_seqid);
7402 out_wait:
7403 nfs4_sequence_done(task, &data->res.seq_res);
7404 dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7405 }
7406
nfs4_lock_done(struct rpc_task * task,void * calldata)7407 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7408 {
7409 struct nfs4_lockdata *data = calldata;
7410 struct nfs4_lock_state *lsp = data->lsp;
7411
7412 if (!nfs4_sequence_done(task, &data->res.seq_res))
7413 return;
7414
7415 data->rpc_status = task->tk_status;
7416 switch (task->tk_status) {
7417 case 0:
7418 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7419 data->timestamp);
7420 if (data->arg.new_lock && !data->cancelled) {
7421 data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7422 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7423 goto out_restart;
7424 }
7425 if (data->arg.new_lock_owner != 0) {
7426 nfs_confirm_seqid(&lsp->ls_seqid, 0);
7427 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7428 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7429 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7430 goto out_restart;
7431 break;
7432 case -NFS4ERR_OLD_STATEID:
7433 if (data->arg.new_lock_owner != 0 &&
7434 nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7435 lsp->ls_state))
7436 goto out_restart;
7437 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7438 goto out_restart;
7439 fallthrough;
7440 case -NFS4ERR_BAD_STATEID:
7441 case -NFS4ERR_STALE_STATEID:
7442 case -NFS4ERR_EXPIRED:
7443 if (data->arg.new_lock_owner != 0) {
7444 if (!nfs4_stateid_match(&data->arg.open_stateid,
7445 &lsp->ls_state->open_stateid))
7446 goto out_restart;
7447 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7448 &lsp->ls_stateid))
7449 goto out_restart;
7450 }
7451 out_done:
7452 dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7453 return;
7454 out_restart:
7455 if (!data->cancelled)
7456 rpc_restart_call_prepare(task);
7457 goto out_done;
7458 }
7459
nfs4_lock_release(void * calldata)7460 static void nfs4_lock_release(void *calldata)
7461 {
7462 struct nfs4_lockdata *data = calldata;
7463
7464 nfs_free_seqid(data->arg.open_seqid);
7465 if (data->cancelled && data->rpc_status == 0) {
7466 struct rpc_task *task;
7467 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7468 data->arg.lock_seqid);
7469 if (!IS_ERR(task))
7470 rpc_put_task_async(task);
7471 dprintk("%s: cancelling lock!\n", __func__);
7472 } else
7473 nfs_free_seqid(data->arg.lock_seqid);
7474 nfs4_put_lock_state(data->lsp);
7475 put_nfs_open_context(data->ctx);
7476 kfree(data);
7477 }
7478
7479 static const struct rpc_call_ops nfs4_lock_ops = {
7480 .rpc_call_prepare = nfs4_lock_prepare,
7481 .rpc_call_done = nfs4_lock_done,
7482 .rpc_release = nfs4_lock_release,
7483 };
7484
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7485 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7486 {
7487 switch (error) {
7488 case -NFS4ERR_ADMIN_REVOKED:
7489 case -NFS4ERR_EXPIRED:
7490 case -NFS4ERR_BAD_STATEID:
7491 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7492 if (new_lock_owner != 0 ||
7493 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7494 nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7495 break;
7496 case -NFS4ERR_STALE_STATEID:
7497 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7498 nfs4_schedule_lease_recovery(server->nfs_client);
7499 }
7500 }
7501
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7502 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7503 {
7504 struct nfs4_lockdata *data;
7505 struct rpc_task *task;
7506 struct rpc_message msg = {
7507 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7508 .rpc_cred = state->owner->so_cred,
7509 };
7510 struct rpc_task_setup task_setup_data = {
7511 .rpc_client = NFS_CLIENT(state->inode),
7512 .rpc_message = &msg,
7513 .callback_ops = &nfs4_lock_ops,
7514 .workqueue = nfsiod_workqueue,
7515 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7516 };
7517 int ret;
7518
7519 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7520 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7521
7522 data = nfs4_alloc_lockdata(fl,
7523 nfs_file_open_context(fl->c.flc_file),
7524 fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7525 if (data == NULL)
7526 return -ENOMEM;
7527 if (IS_SETLKW(cmd))
7528 data->arg.block = 1;
7529 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7530 recovery_type > NFS_LOCK_NEW);
7531 msg.rpc_argp = &data->arg;
7532 msg.rpc_resp = &data->res;
7533 task_setup_data.callback_data = data;
7534 if (recovery_type > NFS_LOCK_NEW) {
7535 if (recovery_type == NFS_LOCK_RECLAIM)
7536 data->arg.reclaim = NFS_LOCK_RECLAIM;
7537 } else
7538 data->arg.new_lock = 1;
7539 task = rpc_run_task(&task_setup_data);
7540 if (IS_ERR(task))
7541 return PTR_ERR(task);
7542 ret = rpc_wait_for_completion_task(task);
7543 if (ret == 0) {
7544 ret = data->rpc_status;
7545 if (ret)
7546 nfs4_handle_setlk_error(data->server, data->lsp,
7547 data->arg.new_lock_owner, ret);
7548 } else
7549 data->cancelled = true;
7550 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7551 rpc_put_task(task);
7552 dprintk("%s: ret = %d\n", __func__, ret);
7553 return ret;
7554 }
7555
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7556 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7557 {
7558 struct nfs_server *server = NFS_SERVER(state->inode);
7559 struct nfs4_exception exception = {
7560 .inode = state->inode,
7561 };
7562 int err;
7563
7564 do {
7565 /* Cache the lock if possible... */
7566 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7567 return 0;
7568 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7569 if (err != -NFS4ERR_DELAY)
7570 break;
7571 nfs4_handle_exception(server, err, &exception);
7572 } while (exception.retry);
7573 return err;
7574 }
7575
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7576 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7577 {
7578 struct nfs_server *server = NFS_SERVER(state->inode);
7579 struct nfs4_exception exception = {
7580 .inode = state->inode,
7581 };
7582 int err;
7583
7584 err = nfs4_set_lock_state(state, request);
7585 if (err != 0)
7586 return err;
7587 if (!recover_lost_locks) {
7588 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7589 return 0;
7590 }
7591 do {
7592 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7593 return 0;
7594 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7595 switch (err) {
7596 default:
7597 goto out;
7598 case -NFS4ERR_GRACE:
7599 case -NFS4ERR_DELAY:
7600 nfs4_handle_exception(server, err, &exception);
7601 err = 0;
7602 }
7603 } while (exception.retry);
7604 out:
7605 return err;
7606 }
7607
7608 #if defined(CONFIG_NFS_V4_1)
nfs41_lock_expired(struct nfs4_state * state,struct file_lock * request)7609 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7610 {
7611 struct nfs4_lock_state *lsp;
7612 int status;
7613
7614 status = nfs4_set_lock_state(state, request);
7615 if (status != 0)
7616 return status;
7617 lsp = request->fl_u.nfs4_fl.owner;
7618 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7619 test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7620 return 0;
7621 return nfs4_lock_expired(state, request);
7622 }
7623 #endif
7624
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7625 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7626 {
7627 struct nfs_inode *nfsi = NFS_I(state->inode);
7628 struct nfs4_state_owner *sp = state->owner;
7629 unsigned char flags = request->c.flc_flags;
7630 int status;
7631
7632 request->c.flc_flags |= FL_ACCESS;
7633 status = locks_lock_inode_wait(state->inode, request);
7634 if (status < 0)
7635 goto out;
7636 mutex_lock(&sp->so_delegreturn_mutex);
7637 down_read(&nfsi->rwsem);
7638 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7639 /* Yes: cache locks! */
7640 /* ...but avoid races with delegation recall... */
7641 request->c.flc_flags = flags & ~FL_SLEEP;
7642 status = locks_lock_inode_wait(state->inode, request);
7643 up_read(&nfsi->rwsem);
7644 mutex_unlock(&sp->so_delegreturn_mutex);
7645 goto out;
7646 }
7647 up_read(&nfsi->rwsem);
7648 mutex_unlock(&sp->so_delegreturn_mutex);
7649 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7650 out:
7651 request->c.flc_flags = flags;
7652 return status;
7653 }
7654
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7655 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7656 {
7657 struct nfs4_exception exception = {
7658 .state = state,
7659 .inode = state->inode,
7660 .interruptible = true,
7661 };
7662 int err;
7663
7664 do {
7665 err = _nfs4_proc_setlk(state, cmd, request);
7666 if (err == -NFS4ERR_DENIED)
7667 err = -EAGAIN;
7668 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7669 err, &exception);
7670 } while (exception.retry);
7671 return err;
7672 }
7673
7674 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7675 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7676
7677 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7678 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7679 struct file_lock *request)
7680 {
7681 int status = -ERESTARTSYS;
7682 unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
7683
7684 while(!signalled()) {
7685 status = nfs4_proc_setlk(state, cmd, request);
7686 if ((status != -EAGAIN) || IS_SETLK(cmd))
7687 break;
7688 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7689 schedule_timeout(timeout);
7690 timeout *= 2;
7691 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7692 status = -ERESTARTSYS;
7693 }
7694 return status;
7695 }
7696
7697 #ifdef CONFIG_NFS_V4_1
7698 struct nfs4_lock_waiter {
7699 struct inode *inode;
7700 struct nfs_lowner owner;
7701 wait_queue_entry_t wait;
7702 };
7703
7704 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7705 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7706 {
7707 struct nfs4_lock_waiter *waiter =
7708 container_of(wait, struct nfs4_lock_waiter, wait);
7709
7710 /* NULL key means to wake up everyone */
7711 if (key) {
7712 struct cb_notify_lock_args *cbnl = key;
7713 struct nfs_lowner *lowner = &cbnl->cbnl_owner,
7714 *wowner = &waiter->owner;
7715
7716 /* Only wake if the callback was for the same owner. */
7717 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7718 return 0;
7719
7720 /* Make sure it's for the right inode */
7721 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7722 return 0;
7723 }
7724
7725 return woken_wake_function(wait, mode, flags, key);
7726 }
7727
7728 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7729 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7730 {
7731 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7732 struct nfs_server *server = NFS_SERVER(state->inode);
7733 struct nfs_client *clp = server->nfs_client;
7734 wait_queue_head_t *q = &clp->cl_lock_waitq;
7735 struct nfs4_lock_waiter waiter = {
7736 .inode = state->inode,
7737 .owner = { .clientid = clp->cl_clientid,
7738 .id = lsp->ls_seqid.owner_id,
7739 .s_dev = server->s_dev },
7740 };
7741 int status;
7742
7743 /* Don't bother with waitqueue if we don't expect a callback */
7744 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7745 return nfs4_retry_setlk_simple(state, cmd, request);
7746
7747 init_wait(&waiter.wait);
7748 waiter.wait.func = nfs4_wake_lock_waiter;
7749 add_wait_queue(q, &waiter.wait);
7750
7751 do {
7752 status = nfs4_proc_setlk(state, cmd, request);
7753 if (status != -EAGAIN || IS_SETLK(cmd))
7754 break;
7755
7756 status = -ERESTARTSYS;
7757 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7758 NFS4_LOCK_MAXTIMEOUT);
7759 } while (!signalled());
7760
7761 remove_wait_queue(q, &waiter.wait);
7762
7763 return status;
7764 }
7765 #else /* !CONFIG_NFS_V4_1 */
7766 static inline int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7767 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7768 {
7769 return nfs4_retry_setlk_simple(state, cmd, request);
7770 }
7771 #endif
7772
7773 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7774 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7775 {
7776 struct nfs_open_context *ctx;
7777 struct nfs4_state *state;
7778 int status;
7779
7780 /* verify open state */
7781 ctx = nfs_file_open_context(filp);
7782 state = ctx->state;
7783
7784 if (IS_GETLK(cmd)) {
7785 if (state != NULL)
7786 return nfs4_proc_getlk(state, F_GETLK, request);
7787 return 0;
7788 }
7789
7790 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7791 return -EINVAL;
7792
7793 if (lock_is_unlock(request)) {
7794 if (state != NULL)
7795 return nfs4_proc_unlck(state, cmd, request);
7796 return 0;
7797 }
7798
7799 if (state == NULL)
7800 return -ENOLCK;
7801
7802 if ((request->c.flc_flags & FL_POSIX) &&
7803 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7804 return -ENOLCK;
7805
7806 /*
7807 * Don't rely on the VFS having checked the file open mode,
7808 * since it won't do this for flock() locks.
7809 */
7810 switch (request->c.flc_type) {
7811 case F_RDLCK:
7812 if (!(filp->f_mode & FMODE_READ))
7813 return -EBADF;
7814 break;
7815 case F_WRLCK:
7816 if (!(filp->f_mode & FMODE_WRITE))
7817 return -EBADF;
7818 }
7819
7820 status = nfs4_set_lock_state(state, request);
7821 if (status != 0)
7822 return status;
7823
7824 return nfs4_retry_setlk(state, cmd, request);
7825 }
7826
nfs4_delete_lease(struct file * file,void ** priv)7827 static int nfs4_delete_lease(struct file *file, void **priv)
7828 {
7829 return generic_setlease(file, F_UNLCK, NULL, priv);
7830 }
7831
nfs4_add_lease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7832 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7833 void **priv)
7834 {
7835 struct inode *inode = file_inode(file);
7836 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7837 int ret;
7838
7839 /* No delegation, no lease */
7840 if (!nfs4_have_delegation(inode, type, 0))
7841 return -EAGAIN;
7842 ret = generic_setlease(file, arg, lease, priv);
7843 if (ret || nfs4_have_delegation(inode, type, 0))
7844 return ret;
7845 /* We raced with a delegation return */
7846 nfs4_delete_lease(file, priv);
7847 return -EAGAIN;
7848 }
7849
nfs4_proc_setlease(struct file * file,int arg,struct file_lease ** lease,void ** priv)7850 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7851 void **priv)
7852 {
7853 switch (arg) {
7854 case F_RDLCK:
7855 case F_WRLCK:
7856 return nfs4_add_lease(file, arg, lease, priv);
7857 case F_UNLCK:
7858 return nfs4_delete_lease(file, priv);
7859 default:
7860 return -EINVAL;
7861 }
7862 }
7863
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7864 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7865 {
7866 struct nfs_server *server = NFS_SERVER(state->inode);
7867 int err;
7868
7869 err = nfs4_set_lock_state(state, fl);
7870 if (err != 0)
7871 return err;
7872 do {
7873 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7874 if (err != -NFS4ERR_DELAY)
7875 break;
7876 ssleep(1);
7877 } while (err == -NFS4ERR_DELAY);
7878 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7879 }
7880
7881 struct nfs_release_lockowner_data {
7882 struct nfs4_lock_state *lsp;
7883 struct nfs_server *server;
7884 struct nfs_release_lockowner_args args;
7885 struct nfs_release_lockowner_res res;
7886 unsigned long timestamp;
7887 };
7888
nfs4_release_lockowner_prepare(struct rpc_task * task,void * calldata)7889 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7890 {
7891 struct nfs_release_lockowner_data *data = calldata;
7892 struct nfs_server *server = data->server;
7893 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7894 &data->res.seq_res, task);
7895 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7896 data->timestamp = jiffies;
7897 }
7898
nfs4_release_lockowner_done(struct rpc_task * task,void * calldata)7899 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7900 {
7901 struct nfs_release_lockowner_data *data = calldata;
7902 struct nfs_server *server = data->server;
7903
7904 nfs40_sequence_done(task, &data->res.seq_res);
7905
7906 switch (task->tk_status) {
7907 case 0:
7908 renew_lease(server, data->timestamp);
7909 break;
7910 case -NFS4ERR_STALE_CLIENTID:
7911 case -NFS4ERR_EXPIRED:
7912 nfs4_schedule_lease_recovery(server->nfs_client);
7913 break;
7914 case -NFS4ERR_LEASE_MOVED:
7915 case -NFS4ERR_DELAY:
7916 if (nfs4_async_handle_error(task, server,
7917 NULL, NULL) == -EAGAIN)
7918 rpc_restart_call_prepare(task);
7919 }
7920 }
7921
nfs4_release_lockowner_release(void * calldata)7922 static void nfs4_release_lockowner_release(void *calldata)
7923 {
7924 struct nfs_release_lockowner_data *data = calldata;
7925 nfs4_free_lock_state(data->server, data->lsp);
7926 kfree(calldata);
7927 }
7928
7929 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7930 .rpc_call_prepare = nfs4_release_lockowner_prepare,
7931 .rpc_call_done = nfs4_release_lockowner_done,
7932 .rpc_release = nfs4_release_lockowner_release,
7933 };
7934
7935 static void
nfs4_release_lockowner(struct nfs_server * server,struct nfs4_lock_state * lsp)7936 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7937 {
7938 struct nfs_release_lockowner_data *data;
7939 struct rpc_message msg = {
7940 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7941 };
7942
7943 if (server->nfs_client->cl_mvops->minor_version != 0)
7944 return;
7945
7946 data = kmalloc(sizeof(*data), GFP_KERNEL);
7947 if (!data)
7948 return;
7949 data->lsp = lsp;
7950 data->server = server;
7951 data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7952 data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7953 data->args.lock_owner.s_dev = server->s_dev;
7954
7955 msg.rpc_argp = &data->args;
7956 msg.rpc_resp = &data->res;
7957 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7958 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7959 }
7960
7961 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7962
nfs4_xattr_set_nfs4_acl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7963 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7964 struct mnt_idmap *idmap,
7965 struct dentry *unused, struct inode *inode,
7966 const char *key, const void *buf,
7967 size_t buflen, int flags)
7968 {
7969 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7970 }
7971
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7972 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7973 struct dentry *unused, struct inode *inode,
7974 const char *key, void *buf, size_t buflen)
7975 {
7976 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7977 }
7978
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7979 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7980 {
7981 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7982 }
7983
7984 #if defined(CONFIG_NFS_V4_1)
7985 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7986
nfs4_xattr_set_nfs4_dacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7987 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7988 struct mnt_idmap *idmap,
7989 struct dentry *unused, struct inode *inode,
7990 const char *key, const void *buf,
7991 size_t buflen, int flags)
7992 {
7993 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7994 }
7995
nfs4_xattr_get_nfs4_dacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7996 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7997 struct dentry *unused, struct inode *inode,
7998 const char *key, void *buf, size_t buflen)
7999 {
8000 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
8001 }
8002
nfs4_xattr_list_nfs4_dacl(struct dentry * dentry)8003 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
8004 {
8005 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
8006 }
8007
8008 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
8009
nfs4_xattr_set_nfs4_sacl(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)8010 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
8011 struct mnt_idmap *idmap,
8012 struct dentry *unused, struct inode *inode,
8013 const char *key, const void *buf,
8014 size_t buflen, int flags)
8015 {
8016 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
8017 }
8018
nfs4_xattr_get_nfs4_sacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)8019 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
8020 struct dentry *unused, struct inode *inode,
8021 const char *key, void *buf, size_t buflen)
8022 {
8023 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
8024 }
8025
nfs4_xattr_list_nfs4_sacl(struct dentry * dentry)8026 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
8027 {
8028 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
8029 }
8030
8031 #endif
8032
8033 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8034
nfs4_xattr_set_nfs4_label(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)8035 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
8036 struct mnt_idmap *idmap,
8037 struct dentry *unused, struct inode *inode,
8038 const char *key, const void *buf,
8039 size_t buflen, int flags)
8040 {
8041 if (security_ismaclabel(key))
8042 return nfs4_set_security_label(inode, buf, buflen);
8043
8044 return -EOPNOTSUPP;
8045 }
8046
nfs4_xattr_get_nfs4_label(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)8047 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
8048 struct dentry *unused, struct inode *inode,
8049 const char *key, void *buf, size_t buflen)
8050 {
8051 if (security_ismaclabel(key))
8052 return nfs4_get_security_label(inode, buf, buflen);
8053 return -EOPNOTSUPP;
8054 }
8055
8056 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)8057 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
8058 {
8059 int len = 0;
8060
8061 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
8062 len = security_inode_listsecurity(inode, list, list_len);
8063 if (len >= 0 && list_len && len > list_len)
8064 return -ERANGE;
8065 }
8066 return len;
8067 }
8068
8069 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
8070 .prefix = XATTR_SECURITY_PREFIX,
8071 .get = nfs4_xattr_get_nfs4_label,
8072 .set = nfs4_xattr_set_nfs4_label,
8073 };
8074
8075 #else
8076
8077 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)8078 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
8079 {
8080 return 0;
8081 }
8082
8083 #endif
8084
8085 #ifdef CONFIG_NFS_V4_2
nfs4_xattr_set_nfs4_user(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)8086 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
8087 struct mnt_idmap *idmap,
8088 struct dentry *unused, struct inode *inode,
8089 const char *key, const void *buf,
8090 size_t buflen, int flags)
8091 {
8092 u32 mask;
8093 int ret;
8094
8095 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8096 return -EOPNOTSUPP;
8097
8098 /*
8099 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
8100 * flags right now. Handling of xattr operations use the normal
8101 * file read/write permissions.
8102 *
8103 * Just in case the server has other ideas (which RFC 8276 allows),
8104 * do a cached access check for the XA* flags to possibly avoid
8105 * doing an RPC and getting EACCES back.
8106 */
8107 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8108 if (!(mask & NFS_ACCESS_XAWRITE))
8109 return -EACCES;
8110 }
8111
8112 if (buf == NULL) {
8113 ret = nfs42_proc_removexattr(inode, key);
8114 if (!ret)
8115 nfs4_xattr_cache_remove(inode, key);
8116 } else {
8117 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
8118 if (!ret)
8119 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
8120 }
8121
8122 return ret;
8123 }
8124
nfs4_xattr_get_nfs4_user(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)8125 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
8126 struct dentry *unused, struct inode *inode,
8127 const char *key, void *buf, size_t buflen)
8128 {
8129 u32 mask;
8130 ssize_t ret;
8131
8132 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8133 return -EOPNOTSUPP;
8134
8135 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8136 if (!(mask & NFS_ACCESS_XAREAD))
8137 return -EACCES;
8138 }
8139
8140 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8141 if (ret)
8142 return ret;
8143
8144 ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
8145 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8146 return ret;
8147
8148 ret = nfs42_proc_getxattr(inode, key, buf, buflen);
8149
8150 return ret;
8151 }
8152
8153 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8154 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8155 {
8156 u64 cookie;
8157 bool eof;
8158 ssize_t ret, size;
8159 char *buf;
8160 size_t buflen;
8161 u32 mask;
8162
8163 if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8164 return 0;
8165
8166 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8167 if (!(mask & NFS_ACCESS_XALIST))
8168 return 0;
8169 }
8170
8171 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8172 if (ret)
8173 return ret;
8174
8175 ret = nfs4_xattr_cache_list(inode, list, list_len);
8176 if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8177 return ret;
8178
8179 cookie = 0;
8180 eof = false;
8181 buflen = list_len ? list_len : XATTR_LIST_MAX;
8182 buf = list_len ? list : NULL;
8183 size = 0;
8184
8185 while (!eof) {
8186 ret = nfs42_proc_listxattrs(inode, buf, buflen,
8187 &cookie, &eof);
8188 if (ret < 0)
8189 return ret;
8190
8191 if (list_len) {
8192 buf += ret;
8193 buflen -= ret;
8194 }
8195 size += ret;
8196 }
8197
8198 if (list_len)
8199 nfs4_xattr_cache_set_list(inode, list, size);
8200
8201 return size;
8202 }
8203
8204 #else
8205
8206 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)8207 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8208 {
8209 return 0;
8210 }
8211 #endif /* CONFIG_NFS_V4_2 */
8212
8213 /*
8214 * nfs_fhget will use either the mounted_on_fileid or the fileid
8215 */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)8216 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
8217 {
8218 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
8219 (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
8220 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
8221 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
8222 return;
8223
8224 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
8225 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
8226 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
8227 fattr->nlink = 2;
8228 }
8229
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8230 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8231 const struct qstr *name,
8232 struct nfs4_fs_locations *fs_locations,
8233 struct page *page)
8234 {
8235 struct nfs_server *server = NFS_SERVER(dir);
8236 u32 bitmask[3];
8237 struct nfs4_fs_locations_arg args = {
8238 .dir_fh = NFS_FH(dir),
8239 .name = name,
8240 .page = page,
8241 .bitmask = bitmask,
8242 };
8243 struct nfs4_fs_locations_res res = {
8244 .fs_locations = fs_locations,
8245 };
8246 struct rpc_message msg = {
8247 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8248 .rpc_argp = &args,
8249 .rpc_resp = &res,
8250 };
8251 int status;
8252
8253 dprintk("%s: start\n", __func__);
8254
8255 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8256 bitmask[1] = nfs4_fattr_bitmap[1];
8257
8258 /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8259 * is not supported */
8260 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8261 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8262 else
8263 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8264
8265 nfs_fattr_init(fs_locations->fattr);
8266 fs_locations->server = server;
8267 fs_locations->nlocations = 0;
8268 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8269 dprintk("%s: returned status = %d\n", __func__, status);
8270 return status;
8271 }
8272
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)8273 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8274 const struct qstr *name,
8275 struct nfs4_fs_locations *fs_locations,
8276 struct page *page)
8277 {
8278 struct nfs4_exception exception = {
8279 .interruptible = true,
8280 };
8281 int err;
8282 do {
8283 err = _nfs4_proc_fs_locations(client, dir, name,
8284 fs_locations, page);
8285 trace_nfs4_get_fs_locations(dir, name, err);
8286 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8287 &exception);
8288 } while (exception.retry);
8289 return err;
8290 }
8291
8292 /*
8293 * This operation also signals the server that this client is
8294 * performing migration recovery. The server can stop returning
8295 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is
8296 * appended to this compound to identify the client ID which is
8297 * performing recovery.
8298 */
_nfs40_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8299 static int _nfs40_proc_get_locations(struct nfs_server *server,
8300 struct nfs_fh *fhandle,
8301 struct nfs4_fs_locations *locations,
8302 struct page *page, const struct cred *cred)
8303 {
8304 struct rpc_clnt *clnt = server->client;
8305 u32 bitmask[2] = {
8306 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8307 };
8308 struct nfs4_fs_locations_arg args = {
8309 .clientid = server->nfs_client->cl_clientid,
8310 .fh = fhandle,
8311 .page = page,
8312 .bitmask = bitmask,
8313 .migration = 1, /* skip LOOKUP */
8314 .renew = 1, /* append RENEW */
8315 };
8316 struct nfs4_fs_locations_res res = {
8317 .fs_locations = locations,
8318 .migration = 1,
8319 .renew = 1,
8320 };
8321 struct rpc_message msg = {
8322 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8323 .rpc_argp = &args,
8324 .rpc_resp = &res,
8325 .rpc_cred = cred,
8326 };
8327 unsigned long now = jiffies;
8328 int status;
8329
8330 nfs_fattr_init(locations->fattr);
8331 locations->server = server;
8332 locations->nlocations = 0;
8333
8334 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8335 status = nfs4_call_sync_sequence(clnt, server, &msg,
8336 &args.seq_args, &res.seq_res);
8337 if (status)
8338 return status;
8339
8340 renew_lease(server, now);
8341 return 0;
8342 }
8343
8344 #ifdef CONFIG_NFS_V4_1
8345
8346 /*
8347 * This operation also signals the server that this client is
8348 * performing migration recovery. The server can stop asserting
8349 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID
8350 * performing this operation is identified in the SEQUENCE
8351 * operation in this compound.
8352 *
8353 * When the client supports GETATTR(fs_locations_info), it can
8354 * be plumbed in here.
8355 */
_nfs41_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8356 static int _nfs41_proc_get_locations(struct nfs_server *server,
8357 struct nfs_fh *fhandle,
8358 struct nfs4_fs_locations *locations,
8359 struct page *page, const struct cred *cred)
8360 {
8361 struct rpc_clnt *clnt = server->client;
8362 u32 bitmask[2] = {
8363 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8364 };
8365 struct nfs4_fs_locations_arg args = {
8366 .fh = fhandle,
8367 .page = page,
8368 .bitmask = bitmask,
8369 .migration = 1, /* skip LOOKUP */
8370 };
8371 struct nfs4_fs_locations_res res = {
8372 .fs_locations = locations,
8373 .migration = 1,
8374 };
8375 struct rpc_message msg = {
8376 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8377 .rpc_argp = &args,
8378 .rpc_resp = &res,
8379 .rpc_cred = cred,
8380 };
8381 struct nfs4_call_sync_data data = {
8382 .seq_server = server,
8383 .seq_args = &args.seq_args,
8384 .seq_res = &res.seq_res,
8385 };
8386 struct rpc_task_setup task_setup_data = {
8387 .rpc_client = clnt,
8388 .rpc_message = &msg,
8389 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8390 .callback_data = &data,
8391 .flags = RPC_TASK_NO_ROUND_ROBIN,
8392 };
8393 int status;
8394
8395 nfs_fattr_init(locations->fattr);
8396 locations->server = server;
8397 locations->nlocations = 0;
8398
8399 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8400 status = nfs4_call_sync_custom(&task_setup_data);
8401 if (status == NFS4_OK &&
8402 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8403 status = -NFS4ERR_LEASE_MOVED;
8404 return status;
8405 }
8406
8407 #endif /* CONFIG_NFS_V4_1 */
8408
8409 /**
8410 * nfs4_proc_get_locations - discover locations for a migrated FSID
8411 * @server: pointer to nfs_server to process
8412 * @fhandle: pointer to the kernel NFS client file handle
8413 * @locations: result of query
8414 * @page: buffer
8415 * @cred: credential to use for this operation
8416 *
8417 * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8418 * operation failed, or a negative errno if a local error occurred.
8419 *
8420 * On success, "locations" is filled in, but if the server has
8421 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8422 * asserted.
8423 *
8424 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8425 * from this client that require migration recovery.
8426 */
nfs4_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8427 int nfs4_proc_get_locations(struct nfs_server *server,
8428 struct nfs_fh *fhandle,
8429 struct nfs4_fs_locations *locations,
8430 struct page *page, const struct cred *cred)
8431 {
8432 struct nfs_client *clp = server->nfs_client;
8433 const struct nfs4_mig_recovery_ops *ops =
8434 clp->cl_mvops->mig_recovery_ops;
8435 struct nfs4_exception exception = {
8436 .interruptible = true,
8437 };
8438 int status;
8439
8440 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8441 (unsigned long long)server->fsid.major,
8442 (unsigned long long)server->fsid.minor,
8443 clp->cl_hostname);
8444 nfs_display_fhandle(fhandle, __func__);
8445
8446 do {
8447 status = ops->get_locations(server, fhandle, locations, page,
8448 cred);
8449 if (status != -NFS4ERR_DELAY)
8450 break;
8451 nfs4_handle_exception(server, status, &exception);
8452 } while (exception.retry);
8453 return status;
8454 }
8455
8456 /*
8457 * This operation also signals the server that this client is
8458 * performing "lease moved" recovery. The server can stop
8459 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
8460 * is appended to this compound to identify the client ID which is
8461 * performing recovery.
8462 */
_nfs40_proc_fsid_present(struct inode * inode,const struct cred * cred)8463 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8464 {
8465 struct nfs_server *server = NFS_SERVER(inode);
8466 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8467 struct rpc_clnt *clnt = server->client;
8468 struct nfs4_fsid_present_arg args = {
8469 .fh = NFS_FH(inode),
8470 .clientid = clp->cl_clientid,
8471 .renew = 1, /* append RENEW */
8472 };
8473 struct nfs4_fsid_present_res res = {
8474 .renew = 1,
8475 };
8476 struct rpc_message msg = {
8477 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8478 .rpc_argp = &args,
8479 .rpc_resp = &res,
8480 .rpc_cred = cred,
8481 };
8482 unsigned long now = jiffies;
8483 int status;
8484
8485 res.fh = nfs_alloc_fhandle();
8486 if (res.fh == NULL)
8487 return -ENOMEM;
8488
8489 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8490 status = nfs4_call_sync_sequence(clnt, server, &msg,
8491 &args.seq_args, &res.seq_res);
8492 nfs_free_fhandle(res.fh);
8493 if (status)
8494 return status;
8495
8496 do_renew_lease(clp, now);
8497 return 0;
8498 }
8499
8500 #ifdef CONFIG_NFS_V4_1
8501
8502 /*
8503 * This operation also signals the server that this client is
8504 * performing "lease moved" recovery. The server can stop asserting
8505 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
8506 * this operation is identified in the SEQUENCE operation in this
8507 * compound.
8508 */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8509 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8510 {
8511 struct nfs_server *server = NFS_SERVER(inode);
8512 struct rpc_clnt *clnt = server->client;
8513 struct nfs4_fsid_present_arg args = {
8514 .fh = NFS_FH(inode),
8515 };
8516 struct nfs4_fsid_present_res res = {
8517 };
8518 struct rpc_message msg = {
8519 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8520 .rpc_argp = &args,
8521 .rpc_resp = &res,
8522 .rpc_cred = cred,
8523 };
8524 int status;
8525
8526 res.fh = nfs_alloc_fhandle();
8527 if (res.fh == NULL)
8528 return -ENOMEM;
8529
8530 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8531 status = nfs4_call_sync_sequence(clnt, server, &msg,
8532 &args.seq_args, &res.seq_res);
8533 nfs_free_fhandle(res.fh);
8534 if (status == NFS4_OK &&
8535 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8536 status = -NFS4ERR_LEASE_MOVED;
8537 return status;
8538 }
8539
8540 #endif /* CONFIG_NFS_V4_1 */
8541
8542 /**
8543 * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8544 * @inode: inode on FSID to check
8545 * @cred: credential to use for this operation
8546 *
8547 * Server indicates whether the FSID is present, moved, or not
8548 * recognized. This operation is necessary to clear a LEASE_MOVED
8549 * condition for this client ID.
8550 *
8551 * Returns NFS4_OK if the FSID is present on this server,
8552 * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8553 * NFS4ERR code if some error occurred on the server, or a
8554 * negative errno if a local failure occurred.
8555 */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8556 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8557 {
8558 struct nfs_server *server = NFS_SERVER(inode);
8559 struct nfs_client *clp = server->nfs_client;
8560 const struct nfs4_mig_recovery_ops *ops =
8561 clp->cl_mvops->mig_recovery_ops;
8562 struct nfs4_exception exception = {
8563 .interruptible = true,
8564 };
8565 int status;
8566
8567 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8568 (unsigned long long)server->fsid.major,
8569 (unsigned long long)server->fsid.minor,
8570 clp->cl_hostname);
8571 nfs_display_fhandle(NFS_FH(inode), __func__);
8572
8573 do {
8574 status = ops->fsid_present(inode, cred);
8575 if (status != -NFS4ERR_DELAY)
8576 break;
8577 nfs4_handle_exception(server, status, &exception);
8578 } while (exception.retry);
8579 return status;
8580 }
8581
8582 /*
8583 * If 'use_integrity' is true and the state managment nfs_client
8584 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8585 * and the machine credential as per RFC3530bis and RFC5661 Security
8586 * Considerations sections. Otherwise, just use the user cred with the
8587 * filesystem's rpc_client.
8588 */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8589 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8590 {
8591 int status;
8592 struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8593 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8594 struct nfs4_secinfo_arg args = {
8595 .dir_fh = NFS_FH(dir),
8596 .name = name,
8597 };
8598 struct nfs4_secinfo_res res = {
8599 .flavors = flavors,
8600 };
8601 struct rpc_message msg = {
8602 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8603 .rpc_argp = &args,
8604 .rpc_resp = &res,
8605 };
8606 struct nfs4_call_sync_data data = {
8607 .seq_server = NFS_SERVER(dir),
8608 .seq_args = &args.seq_args,
8609 .seq_res = &res.seq_res,
8610 };
8611 struct rpc_task_setup task_setup = {
8612 .rpc_client = clnt,
8613 .rpc_message = &msg,
8614 .callback_ops = clp->cl_mvops->call_sync_ops,
8615 .callback_data = &data,
8616 .flags = RPC_TASK_NO_ROUND_ROBIN,
8617 };
8618 const struct cred *cred = NULL;
8619
8620 if (use_integrity) {
8621 clnt = clp->cl_rpcclient;
8622 task_setup.rpc_client = clnt;
8623
8624 cred = nfs4_get_clid_cred(clp);
8625 msg.rpc_cred = cred;
8626 }
8627
8628 dprintk("NFS call secinfo %s\n", name->name);
8629
8630 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8631 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8632 status = nfs4_call_sync_custom(&task_setup);
8633
8634 dprintk("NFS reply secinfo: %d\n", status);
8635
8636 put_cred(cred);
8637 return status;
8638 }
8639
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8640 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8641 struct nfs4_secinfo_flavors *flavors)
8642 {
8643 struct nfs4_exception exception = {
8644 .interruptible = true,
8645 };
8646 int err;
8647 do {
8648 err = -NFS4ERR_WRONGSEC;
8649
8650 /* try to use integrity protection with machine cred */
8651 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8652 err = _nfs4_proc_secinfo(dir, name, flavors, true);
8653
8654 /*
8655 * if unable to use integrity protection, or SECINFO with
8656 * integrity protection returns NFS4ERR_WRONGSEC (which is
8657 * disallowed by spec, but exists in deployed servers) use
8658 * the current filesystem's rpc_client and the user cred.
8659 */
8660 if (err == -NFS4ERR_WRONGSEC)
8661 err = _nfs4_proc_secinfo(dir, name, flavors, false);
8662
8663 trace_nfs4_secinfo(dir, name, err);
8664 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8665 &exception);
8666 } while (exception.retry);
8667 return err;
8668 }
8669
8670 #ifdef CONFIG_NFS_V4_1
8671 /*
8672 * Check the exchange flags returned by the server for invalid flags, having
8673 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8674 * DS flags set.
8675 */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8676 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8677 {
8678 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8679 goto out_inval;
8680 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8681 goto out_inval;
8682 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8683 (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8684 goto out_inval;
8685 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8686 goto out_inval;
8687 return NFS_OK;
8688 out_inval:
8689 return -NFS4ERR_INVAL;
8690 }
8691
8692 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8693 nfs41_same_server_scope(struct nfs41_server_scope *a,
8694 struct nfs41_server_scope *b)
8695 {
8696 if (a->server_scope_sz != b->server_scope_sz)
8697 return false;
8698 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8699 }
8700
8701 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8702 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8703 {
8704 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8705 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8706 struct nfs_client *clp = args->client;
8707
8708 switch (task->tk_status) {
8709 case -NFS4ERR_BADSESSION:
8710 case -NFS4ERR_DEADSESSION:
8711 nfs4_schedule_session_recovery(clp->cl_session,
8712 task->tk_status);
8713 return;
8714 }
8715 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8716 res->dir != NFS4_CDFS4_BOTH) {
8717 rpc_task_close_connection(task);
8718 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8719 rpc_restart_call(task);
8720 }
8721 }
8722
8723 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8724 .rpc_call_done = nfs4_bind_one_conn_to_session_done,
8725 };
8726
8727 /*
8728 * nfs4_proc_bind_one_conn_to_session()
8729 *
8730 * The 4.1 client currently uses the same TCP connection for the
8731 * fore and backchannel.
8732 */
8733 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8734 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8735 struct rpc_xprt *xprt,
8736 struct nfs_client *clp,
8737 const struct cred *cred)
8738 {
8739 int status;
8740 struct nfs41_bind_conn_to_session_args args = {
8741 .client = clp,
8742 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8743 .retries = 0,
8744 };
8745 struct nfs41_bind_conn_to_session_res res;
8746 struct rpc_message msg = {
8747 .rpc_proc =
8748 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8749 .rpc_argp = &args,
8750 .rpc_resp = &res,
8751 .rpc_cred = cred,
8752 };
8753 struct rpc_task_setup task_setup_data = {
8754 .rpc_client = clnt,
8755 .rpc_xprt = xprt,
8756 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8757 .rpc_message = &msg,
8758 .flags = RPC_TASK_TIMEOUT,
8759 };
8760 struct rpc_task *task;
8761
8762 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8763 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8764 args.dir = NFS4_CDFC4_FORE;
8765
8766 /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8767 if (xprt != rcu_access_pointer(clnt->cl_xprt))
8768 args.dir = NFS4_CDFC4_FORE;
8769
8770 task = rpc_run_task(&task_setup_data);
8771 if (!IS_ERR(task)) {
8772 status = task->tk_status;
8773 rpc_put_task(task);
8774 } else
8775 status = PTR_ERR(task);
8776 trace_nfs4_bind_conn_to_session(clp, status);
8777 if (status == 0) {
8778 if (memcmp(res.sessionid.data,
8779 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8780 dprintk("NFS: %s: Session ID mismatch\n", __func__);
8781 return -EIO;
8782 }
8783 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8784 dprintk("NFS: %s: Unexpected direction from server\n",
8785 __func__);
8786 return -EIO;
8787 }
8788 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8789 dprintk("NFS: %s: Server returned RDMA mode = true\n",
8790 __func__);
8791 return -EIO;
8792 }
8793 }
8794
8795 return status;
8796 }
8797
8798 struct rpc_bind_conn_calldata {
8799 struct nfs_client *clp;
8800 const struct cred *cred;
8801 };
8802
8803 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8804 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8805 struct rpc_xprt *xprt,
8806 void *calldata)
8807 {
8808 struct rpc_bind_conn_calldata *p = calldata;
8809
8810 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8811 }
8812
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8813 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8814 {
8815 struct rpc_bind_conn_calldata data = {
8816 .clp = clp,
8817 .cred = cred,
8818 };
8819 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8820 nfs4_proc_bind_conn_to_session_callback, &data);
8821 }
8822
8823 /*
8824 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8825 * and operations we'd like to see to enable certain features in the allow map
8826 */
8827 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8828 .how = SP4_MACH_CRED,
8829 .enforce.u.words = {
8830 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8831 1 << (OP_EXCHANGE_ID - 32) |
8832 1 << (OP_CREATE_SESSION - 32) |
8833 1 << (OP_DESTROY_SESSION - 32) |
8834 1 << (OP_DESTROY_CLIENTID - 32)
8835 },
8836 .allow.u.words = {
8837 [0] = 1 << (OP_CLOSE) |
8838 1 << (OP_OPEN_DOWNGRADE) |
8839 1 << (OP_LOCKU) |
8840 1 << (OP_DELEGRETURN) |
8841 1 << (OP_COMMIT),
8842 [1] = 1 << (OP_SECINFO - 32) |
8843 1 << (OP_SECINFO_NO_NAME - 32) |
8844 1 << (OP_LAYOUTRETURN - 32) |
8845 1 << (OP_TEST_STATEID - 32) |
8846 1 << (OP_FREE_STATEID - 32) |
8847 1 << (OP_WRITE - 32)
8848 }
8849 };
8850
8851 /*
8852 * Select the state protection mode for client `clp' given the server results
8853 * from exchange_id in `sp'.
8854 *
8855 * Returns 0 on success, negative errno otherwise.
8856 */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8857 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8858 struct nfs41_state_protection *sp)
8859 {
8860 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8861 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8862 1 << (OP_EXCHANGE_ID - 32) |
8863 1 << (OP_CREATE_SESSION - 32) |
8864 1 << (OP_DESTROY_SESSION - 32) |
8865 1 << (OP_DESTROY_CLIENTID - 32)
8866 };
8867 unsigned long flags = 0;
8868 unsigned int i;
8869 int ret = 0;
8870
8871 if (sp->how == SP4_MACH_CRED) {
8872 /* Print state protect result */
8873 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8874 for (i = 0; i <= LAST_NFS4_OP; i++) {
8875 if (test_bit(i, sp->enforce.u.longs))
8876 dfprintk(MOUNT, " enforce op %d\n", i);
8877 if (test_bit(i, sp->allow.u.longs))
8878 dfprintk(MOUNT, " allow op %d\n", i);
8879 }
8880
8881 /* make sure nothing is on enforce list that isn't supported */
8882 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8883 if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8884 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8885 ret = -EINVAL;
8886 goto out;
8887 }
8888 }
8889
8890 /*
8891 * Minimal mode - state operations are allowed to use machine
8892 * credential. Note this already happens by default, so the
8893 * client doesn't have to do anything more than the negotiation.
8894 *
8895 * NOTE: we don't care if EXCHANGE_ID is in the list -
8896 * we're already using the machine cred for exchange_id
8897 * and will never use a different cred.
8898 */
8899 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8900 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8901 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8902 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8903 dfprintk(MOUNT, "sp4_mach_cred:\n");
8904 dfprintk(MOUNT, " minimal mode enabled\n");
8905 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8906 } else {
8907 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8908 ret = -EINVAL;
8909 goto out;
8910 }
8911
8912 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8913 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8914 test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8915 test_bit(OP_LOCKU, sp->allow.u.longs)) {
8916 dfprintk(MOUNT, " cleanup mode enabled\n");
8917 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8918 }
8919
8920 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8921 dfprintk(MOUNT, " pnfs cleanup mode enabled\n");
8922 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8923 }
8924
8925 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8926 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8927 dfprintk(MOUNT, " secinfo mode enabled\n");
8928 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8929 }
8930
8931 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8932 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8933 dfprintk(MOUNT, " stateid mode enabled\n");
8934 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8935 }
8936
8937 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8938 dfprintk(MOUNT, " write mode enabled\n");
8939 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8940 }
8941
8942 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8943 dfprintk(MOUNT, " commit mode enabled\n");
8944 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8945 }
8946 }
8947 out:
8948 clp->cl_sp4_flags = flags;
8949 return ret;
8950 }
8951
8952 struct nfs41_exchange_id_data {
8953 struct nfs41_exchange_id_res res;
8954 struct nfs41_exchange_id_args args;
8955 };
8956
nfs4_exchange_id_release(void * data)8957 static void nfs4_exchange_id_release(void *data)
8958 {
8959 struct nfs41_exchange_id_data *cdata =
8960 (struct nfs41_exchange_id_data *)data;
8961
8962 nfs_put_client(cdata->args.client);
8963 kfree(cdata->res.impl_id);
8964 kfree(cdata->res.server_scope);
8965 kfree(cdata->res.server_owner);
8966 kfree(cdata);
8967 }
8968
8969 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8970 .rpc_release = nfs4_exchange_id_release,
8971 };
8972
8973 /*
8974 * _nfs4_proc_exchange_id()
8975 *
8976 * Wrapper for EXCHANGE_ID operation.
8977 */
8978 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8979 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8980 u32 sp4_how, struct rpc_xprt *xprt)
8981 {
8982 struct rpc_message msg = {
8983 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8984 .rpc_cred = cred,
8985 };
8986 struct rpc_task_setup task_setup_data = {
8987 .rpc_client = clp->cl_rpcclient,
8988 .callback_ops = &nfs4_exchange_id_call_ops,
8989 .rpc_message = &msg,
8990 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8991 };
8992 struct nfs41_exchange_id_data *calldata;
8993 int status;
8994
8995 if (!refcount_inc_not_zero(&clp->cl_count))
8996 return ERR_PTR(-EIO);
8997
8998 status = -ENOMEM;
8999 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9000 if (!calldata)
9001 goto out;
9002
9003 nfs4_init_boot_verifier(clp, &calldata->args.verifier);
9004
9005 status = nfs4_init_uniform_client_string(clp);
9006 if (status)
9007 goto out_calldata;
9008
9009 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
9010 GFP_NOFS);
9011 status = -ENOMEM;
9012 if (unlikely(calldata->res.server_owner == NULL))
9013 goto out_calldata;
9014
9015 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
9016 GFP_NOFS);
9017 if (unlikely(calldata->res.server_scope == NULL))
9018 goto out_server_owner;
9019
9020 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
9021 if (unlikely(calldata->res.impl_id == NULL))
9022 goto out_server_scope;
9023
9024 switch (sp4_how) {
9025 case SP4_NONE:
9026 calldata->args.state_protect.how = SP4_NONE;
9027 break;
9028
9029 case SP4_MACH_CRED:
9030 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
9031 break;
9032
9033 default:
9034 /* unsupported! */
9035 WARN_ON_ONCE(1);
9036 status = -EINVAL;
9037 goto out_impl_id;
9038 }
9039 if (xprt) {
9040 task_setup_data.rpc_xprt = xprt;
9041 task_setup_data.flags |= RPC_TASK_SOFTCONN;
9042 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
9043 sizeof(calldata->args.verifier.data));
9044 }
9045 calldata->args.client = clp;
9046 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
9047 EXCHGID4_FLAG_BIND_PRINC_STATEID;
9048 #ifdef CONFIG_NFS_V4_1_MIGRATION
9049 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
9050 #endif
9051 if (test_bit(NFS_CS_PNFS, &clp->cl_flags))
9052 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
9053 msg.rpc_argp = &calldata->args;
9054 msg.rpc_resp = &calldata->res;
9055 task_setup_data.callback_data = calldata;
9056
9057 return rpc_run_task(&task_setup_data);
9058
9059 out_impl_id:
9060 kfree(calldata->res.impl_id);
9061 out_server_scope:
9062 kfree(calldata->res.server_scope);
9063 out_server_owner:
9064 kfree(calldata->res.server_owner);
9065 out_calldata:
9066 kfree(calldata);
9067 out:
9068 nfs_put_client(clp);
9069 return ERR_PTR(status);
9070 }
9071
9072 /*
9073 * _nfs4_proc_exchange_id()
9074 *
9075 * Wrapper for EXCHANGE_ID operation.
9076 */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)9077 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
9078 u32 sp4_how)
9079 {
9080 struct rpc_task *task;
9081 struct nfs41_exchange_id_args *argp;
9082 struct nfs41_exchange_id_res *resp;
9083 unsigned long now = jiffies;
9084 int status;
9085
9086 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
9087 if (IS_ERR(task))
9088 return PTR_ERR(task);
9089
9090 argp = task->tk_msg.rpc_argp;
9091 resp = task->tk_msg.rpc_resp;
9092 status = task->tk_status;
9093 if (status != 0)
9094 goto out;
9095
9096 status = nfs4_check_cl_exchange_flags(resp->flags,
9097 clp->cl_mvops->minor_version);
9098 if (status != 0)
9099 goto out;
9100
9101 status = nfs4_sp4_select_mode(clp, &resp->state_protect);
9102 if (status != 0)
9103 goto out;
9104
9105 do_renew_lease(clp, now);
9106
9107 clp->cl_clientid = resp->clientid;
9108 clp->cl_exchange_flags = resp->flags;
9109 clp->cl_seqid = resp->seqid;
9110 /* Client ID is not confirmed */
9111 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
9112 clear_bit(NFS4_SESSION_ESTABLISHED,
9113 &clp->cl_session->session_state);
9114
9115 if (clp->cl_serverscope != NULL &&
9116 !nfs41_same_server_scope(clp->cl_serverscope,
9117 resp->server_scope)) {
9118 dprintk("%s: server_scope mismatch detected\n",
9119 __func__);
9120 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
9121 }
9122
9123 swap(clp->cl_serverowner, resp->server_owner);
9124 swap(clp->cl_serverscope, resp->server_scope);
9125 swap(clp->cl_implid, resp->impl_id);
9126
9127 /* Save the EXCHANGE_ID verifier session trunk tests */
9128 memcpy(clp->cl_confirm.data, argp->verifier.data,
9129 sizeof(clp->cl_confirm.data));
9130 out:
9131 trace_nfs4_exchange_id(clp, status);
9132 rpc_put_task(task);
9133 return status;
9134 }
9135
9136 /*
9137 * nfs4_proc_exchange_id()
9138 *
9139 * Returns zero, a negative errno, or a negative NFS4ERR status code.
9140 *
9141 * Since the clientid has expired, all compounds using sessions
9142 * associated with the stale clientid will be returning
9143 * NFS4ERR_BADSESSION in the sequence operation, and will therefore
9144 * be in some phase of session reset.
9145 *
9146 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
9147 */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)9148 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
9149 {
9150 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
9151 int status;
9152
9153 /* try SP4_MACH_CRED if krb5i/p */
9154 if (authflavor == RPC_AUTH_GSS_KRB5I ||
9155 authflavor == RPC_AUTH_GSS_KRB5P) {
9156 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
9157 if (!status)
9158 return 0;
9159 }
9160
9161 /* try SP4_NONE */
9162 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
9163 }
9164
9165 /**
9166 * nfs4_test_session_trunk
9167 *
9168 * This is an add_xprt_test() test function called from
9169 * rpc_clnt_setup_test_and_add_xprt.
9170 *
9171 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
9172 * and is dereferrenced in nfs4_exchange_id_release
9173 *
9174 * Upon success, add the new transport to the rpc_clnt
9175 *
9176 * @clnt: struct rpc_clnt to get new transport
9177 * @xprt: the rpc_xprt to test
9178 * @data: call data for _nfs4_proc_exchange_id.
9179 */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)9180 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
9181 void *data)
9182 {
9183 struct nfs4_add_xprt_data *adata = data;
9184 struct rpc_task *task;
9185 int status;
9186
9187 u32 sp4_how;
9188
9189 dprintk("--> %s try %s\n", __func__,
9190 xprt->address_strings[RPC_DISPLAY_ADDR]);
9191
9192 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
9193
9194 try_again:
9195 /* Test connection for session trunking. Async exchange_id call */
9196 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
9197 if (IS_ERR(task))
9198 return;
9199
9200 status = task->tk_status;
9201 if (status == 0) {
9202 status = nfs4_detect_session_trunking(adata->clp,
9203 task->tk_msg.rpc_resp, xprt);
9204 trace_nfs4_trunked_exchange_id(adata->clp,
9205 xprt->address_strings[RPC_DISPLAY_ADDR], status);
9206 }
9207 if (status == 0)
9208 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
9209 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
9210 (struct sockaddr *)&xprt->addr))
9211 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
9212
9213 rpc_put_task(task);
9214 if (status == -NFS4ERR_DELAY) {
9215 ssleep(1);
9216 goto try_again;
9217 }
9218 }
9219 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
9220
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9221 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
9222 const struct cred *cred)
9223 {
9224 struct rpc_message msg = {
9225 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
9226 .rpc_argp = clp,
9227 .rpc_cred = cred,
9228 };
9229 int status;
9230
9231 status = rpc_call_sync(clp->cl_rpcclient, &msg,
9232 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9233 trace_nfs4_destroy_clientid(clp, status);
9234 if (status)
9235 dprintk("NFS: Got error %d from the server %s on "
9236 "DESTROY_CLIENTID.", status, clp->cl_hostname);
9237 return status;
9238 }
9239
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)9240 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9241 const struct cred *cred)
9242 {
9243 unsigned int loop;
9244 int ret;
9245
9246 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9247 ret = _nfs4_proc_destroy_clientid(clp, cred);
9248 switch (ret) {
9249 case -NFS4ERR_DELAY:
9250 case -NFS4ERR_CLIENTID_BUSY:
9251 ssleep(1);
9252 break;
9253 default:
9254 return ret;
9255 }
9256 }
9257 return 0;
9258 }
9259
nfs4_destroy_clientid(struct nfs_client * clp)9260 int nfs4_destroy_clientid(struct nfs_client *clp)
9261 {
9262 const struct cred *cred;
9263 int ret = 0;
9264
9265 if (clp->cl_mvops->minor_version < 1)
9266 goto out;
9267 if (clp->cl_exchange_flags == 0)
9268 goto out;
9269 if (clp->cl_preserve_clid)
9270 goto out;
9271 cred = nfs4_get_clid_cred(clp);
9272 ret = nfs4_proc_destroy_clientid(clp, cred);
9273 put_cred(cred);
9274 switch (ret) {
9275 case 0:
9276 case -NFS4ERR_STALE_CLIENTID:
9277 clp->cl_exchange_flags = 0;
9278 }
9279 out:
9280 return ret;
9281 }
9282
9283 #endif /* CONFIG_NFS_V4_1 */
9284
9285 struct nfs4_get_lease_time_data {
9286 struct nfs4_get_lease_time_args *args;
9287 struct nfs4_get_lease_time_res *res;
9288 struct nfs_client *clp;
9289 };
9290
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)9291 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9292 void *calldata)
9293 {
9294 struct nfs4_get_lease_time_data *data =
9295 (struct nfs4_get_lease_time_data *)calldata;
9296
9297 /* just setup sequence, do not trigger session recovery
9298 since we're invoked within one */
9299 nfs4_setup_sequence(data->clp,
9300 &data->args->la_seq_args,
9301 &data->res->lr_seq_res,
9302 task);
9303 }
9304
9305 /*
9306 * Called from nfs4_state_manager thread for session setup, so don't recover
9307 * from sequence operation or clientid errors.
9308 */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)9309 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9310 {
9311 struct nfs4_get_lease_time_data *data =
9312 (struct nfs4_get_lease_time_data *)calldata;
9313
9314 if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9315 return;
9316 switch (task->tk_status) {
9317 case -NFS4ERR_DELAY:
9318 case -NFS4ERR_GRACE:
9319 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9320 task->tk_status = 0;
9321 fallthrough;
9322 case -NFS4ERR_RETRY_UNCACHED_REP:
9323 rpc_restart_call_prepare(task);
9324 return;
9325 }
9326 }
9327
9328 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9329 .rpc_call_prepare = nfs4_get_lease_time_prepare,
9330 .rpc_call_done = nfs4_get_lease_time_done,
9331 };
9332
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)9333 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9334 {
9335 struct nfs4_get_lease_time_args args;
9336 struct nfs4_get_lease_time_res res = {
9337 .lr_fsinfo = fsinfo,
9338 };
9339 struct nfs4_get_lease_time_data data = {
9340 .args = &args,
9341 .res = &res,
9342 .clp = clp,
9343 };
9344 struct rpc_message msg = {
9345 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9346 .rpc_argp = &args,
9347 .rpc_resp = &res,
9348 };
9349 struct rpc_task_setup task_setup = {
9350 .rpc_client = clp->cl_rpcclient,
9351 .rpc_message = &msg,
9352 .callback_ops = &nfs4_get_lease_time_ops,
9353 .callback_data = &data,
9354 .flags = RPC_TASK_TIMEOUT,
9355 };
9356
9357 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9358 return nfs4_call_sync_custom(&task_setup);
9359 }
9360
9361 #ifdef CONFIG_NFS_V4_1
9362
9363 /*
9364 * Initialize the values to be used by the client in CREATE_SESSION
9365 * If nfs4_init_session set the fore channel request and response sizes,
9366 * use them.
9367 *
9368 * Set the back channel max_resp_sz_cached to zero to force the client to
9369 * always set csa_cachethis to FALSE because the current implementation
9370 * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9371 */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)9372 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9373 struct rpc_clnt *clnt)
9374 {
9375 unsigned int max_rqst_sz, max_resp_sz;
9376 unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9377 unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9378
9379 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9380 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9381
9382 /* Fore channel attributes */
9383 args->fc_attrs.max_rqst_sz = max_rqst_sz;
9384 args->fc_attrs.max_resp_sz = max_resp_sz;
9385 args->fc_attrs.max_ops = NFS4_MAX_OPS;
9386 args->fc_attrs.max_reqs = max_session_slots;
9387
9388 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9389 "max_ops=%u max_reqs=%u\n",
9390 __func__,
9391 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9392 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9393
9394 /* Back channel attributes */
9395 args->bc_attrs.max_rqst_sz = max_bc_payload;
9396 args->bc_attrs.max_resp_sz = max_bc_payload;
9397 args->bc_attrs.max_resp_sz_cached = 0;
9398 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9399 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9400 if (args->bc_attrs.max_reqs > max_bc_slots)
9401 args->bc_attrs.max_reqs = max_bc_slots;
9402
9403 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9404 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9405 __func__,
9406 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9407 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9408 args->bc_attrs.max_reqs);
9409 }
9410
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9411 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9412 struct nfs41_create_session_res *res)
9413 {
9414 struct nfs4_channel_attrs *sent = &args->fc_attrs;
9415 struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9416
9417 if (rcvd->max_resp_sz > sent->max_resp_sz)
9418 return -EINVAL;
9419 /*
9420 * Our requested max_ops is the minimum we need; we're not
9421 * prepared to break up compounds into smaller pieces than that.
9422 * So, no point even trying to continue if the server won't
9423 * cooperate:
9424 */
9425 if (rcvd->max_ops < sent->max_ops)
9426 return -EINVAL;
9427 if (rcvd->max_reqs == 0)
9428 return -EINVAL;
9429 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9430 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9431 return 0;
9432 }
9433
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9434 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9435 struct nfs41_create_session_res *res)
9436 {
9437 struct nfs4_channel_attrs *sent = &args->bc_attrs;
9438 struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9439
9440 if (!(res->flags & SESSION4_BACK_CHAN))
9441 goto out;
9442 if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9443 return -EINVAL;
9444 if (rcvd->max_resp_sz < sent->max_resp_sz)
9445 return -EINVAL;
9446 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9447 return -EINVAL;
9448 if (rcvd->max_ops > sent->max_ops)
9449 return -EINVAL;
9450 if (rcvd->max_reqs > sent->max_reqs)
9451 return -EINVAL;
9452 out:
9453 return 0;
9454 }
9455
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9456 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9457 struct nfs41_create_session_res *res)
9458 {
9459 int ret;
9460
9461 ret = nfs4_verify_fore_channel_attrs(args, res);
9462 if (ret)
9463 return ret;
9464 return nfs4_verify_back_channel_attrs(args, res);
9465 }
9466
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)9467 static void nfs4_update_session(struct nfs4_session *session,
9468 struct nfs41_create_session_res *res)
9469 {
9470 nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9471 /* Mark client id and session as being confirmed */
9472 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9473 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9474 session->flags = res->flags;
9475 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9476 if (res->flags & SESSION4_BACK_CHAN)
9477 memcpy(&session->bc_attrs, &res->bc_attrs,
9478 sizeof(session->bc_attrs));
9479 }
9480
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9481 static int _nfs4_proc_create_session(struct nfs_client *clp,
9482 const struct cred *cred)
9483 {
9484 struct nfs4_session *session = clp->cl_session;
9485 struct nfs41_create_session_args args = {
9486 .client = clp,
9487 .clientid = clp->cl_clientid,
9488 .seqid = clp->cl_seqid,
9489 .cb_program = NFS4_CALLBACK,
9490 };
9491 struct nfs41_create_session_res res;
9492
9493 struct rpc_message msg = {
9494 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9495 .rpc_argp = &args,
9496 .rpc_resp = &res,
9497 .rpc_cred = cred,
9498 };
9499 int status;
9500
9501 nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9502 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9503
9504 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9505 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9506 trace_nfs4_create_session(clp, status);
9507
9508 switch (status) {
9509 case -NFS4ERR_STALE_CLIENTID:
9510 case -NFS4ERR_DELAY:
9511 case -ETIMEDOUT:
9512 case -EACCES:
9513 case -EAGAIN:
9514 goto out;
9515 }
9516
9517 clp->cl_seqid++;
9518 if (!status) {
9519 /* Verify the session's negotiated channel_attrs values */
9520 status = nfs4_verify_channel_attrs(&args, &res);
9521 /* Increment the clientid slot sequence id */
9522 if (status)
9523 goto out;
9524 nfs4_update_session(session, &res);
9525 }
9526 out:
9527 return status;
9528 }
9529
9530 /*
9531 * Issues a CREATE_SESSION operation to the server.
9532 * It is the responsibility of the caller to verify the session is
9533 * expired before calling this routine.
9534 */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9535 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9536 {
9537 int status;
9538 unsigned *ptr;
9539 struct nfs4_session *session = clp->cl_session;
9540 struct nfs4_add_xprt_data xprtdata = {
9541 .clp = clp,
9542 };
9543 struct rpc_add_xprt_test rpcdata = {
9544 .add_xprt_test = clp->cl_mvops->session_trunk,
9545 .data = &xprtdata,
9546 };
9547
9548 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9549
9550 status = _nfs4_proc_create_session(clp, cred);
9551 if (status)
9552 goto out;
9553
9554 /* Init or reset the session slot tables */
9555 status = nfs4_setup_session_slot_tables(session);
9556 dprintk("slot table setup returned %d\n", status);
9557 if (status)
9558 goto out;
9559
9560 ptr = (unsigned *)&session->sess_id.data[0];
9561 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9562 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9563 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9564 out:
9565 return status;
9566 }
9567
9568 /*
9569 * Issue the over-the-wire RPC DESTROY_SESSION.
9570 * The caller must serialize access to this routine.
9571 */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9572 int nfs4_proc_destroy_session(struct nfs4_session *session,
9573 const struct cred *cred)
9574 {
9575 struct rpc_message msg = {
9576 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9577 .rpc_argp = session,
9578 .rpc_cred = cred,
9579 };
9580 int status = 0;
9581
9582 /* session is still being setup */
9583 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9584 return 0;
9585
9586 status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9587 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9588 trace_nfs4_destroy_session(session->clp, status);
9589
9590 if (status)
9591 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9592 "Session has been destroyed regardless...\n", status);
9593 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9594 return status;
9595 }
9596
9597 /*
9598 * Renew the cl_session lease.
9599 */
9600 struct nfs4_sequence_data {
9601 struct nfs_client *clp;
9602 struct nfs4_sequence_args args;
9603 struct nfs4_sequence_res res;
9604 };
9605
nfs41_sequence_release(void * data)9606 static void nfs41_sequence_release(void *data)
9607 {
9608 struct nfs4_sequence_data *calldata = data;
9609 struct nfs_client *clp = calldata->clp;
9610
9611 if (refcount_read(&clp->cl_count) > 1)
9612 nfs4_schedule_state_renewal(clp);
9613 nfs_put_client(clp);
9614 kfree(calldata);
9615 }
9616
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9617 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9618 {
9619 switch(task->tk_status) {
9620 case -NFS4ERR_DELAY:
9621 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9622 return -EAGAIN;
9623 default:
9624 nfs4_schedule_lease_recovery(clp);
9625 }
9626 return 0;
9627 }
9628
nfs41_sequence_call_done(struct rpc_task * task,void * data)9629 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9630 {
9631 struct nfs4_sequence_data *calldata = data;
9632 struct nfs_client *clp = calldata->clp;
9633
9634 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9635 return;
9636
9637 trace_nfs4_sequence(clp, task->tk_status);
9638 if (task->tk_status < 0 && clp->cl_cons_state >= 0) {
9639 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9640 if (refcount_read(&clp->cl_count) == 1)
9641 return;
9642
9643 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9644 rpc_restart_call_prepare(task);
9645 return;
9646 }
9647 }
9648 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9649 }
9650
nfs41_sequence_prepare(struct rpc_task * task,void * data)9651 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9652 {
9653 struct nfs4_sequence_data *calldata = data;
9654 struct nfs_client *clp = calldata->clp;
9655 struct nfs4_sequence_args *args;
9656 struct nfs4_sequence_res *res;
9657
9658 args = task->tk_msg.rpc_argp;
9659 res = task->tk_msg.rpc_resp;
9660
9661 nfs4_setup_sequence(clp, args, res, task);
9662 }
9663
9664 static const struct rpc_call_ops nfs41_sequence_ops = {
9665 .rpc_call_done = nfs41_sequence_call_done,
9666 .rpc_call_prepare = nfs41_sequence_prepare,
9667 .rpc_release = nfs41_sequence_release,
9668 };
9669
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9670 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9671 const struct cred *cred,
9672 struct nfs4_slot *slot,
9673 bool is_privileged)
9674 {
9675 struct nfs4_sequence_data *calldata;
9676 struct rpc_message msg = {
9677 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9678 .rpc_cred = cred,
9679 };
9680 struct rpc_task_setup task_setup_data = {
9681 .rpc_client = clp->cl_rpcclient,
9682 .rpc_message = &msg,
9683 .callback_ops = &nfs41_sequence_ops,
9684 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9685 };
9686 struct rpc_task *ret;
9687
9688 ret = ERR_PTR(-EIO);
9689 if (!refcount_inc_not_zero(&clp->cl_count))
9690 goto out_err;
9691
9692 ret = ERR_PTR(-ENOMEM);
9693 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9694 if (calldata == NULL)
9695 goto out_put_clp;
9696 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9697 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9698 msg.rpc_argp = &calldata->args;
9699 msg.rpc_resp = &calldata->res;
9700 calldata->clp = clp;
9701 task_setup_data.callback_data = calldata;
9702
9703 ret = rpc_run_task(&task_setup_data);
9704 if (IS_ERR(ret))
9705 goto out_err;
9706 return ret;
9707 out_put_clp:
9708 nfs_put_client(clp);
9709 out_err:
9710 nfs41_release_slot(slot);
9711 return ret;
9712 }
9713
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9714 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9715 {
9716 struct rpc_task *task;
9717 int ret = 0;
9718
9719 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9720 return -EAGAIN;
9721 task = _nfs41_proc_sequence(clp, cred, NULL, false);
9722 if (IS_ERR(task))
9723 ret = PTR_ERR(task);
9724 else
9725 rpc_put_task_async(task);
9726 dprintk("<-- %s status=%d\n", __func__, ret);
9727 return ret;
9728 }
9729
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9730 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9731 {
9732 struct rpc_task *task;
9733 int ret;
9734
9735 task = _nfs41_proc_sequence(clp, cred, NULL, true);
9736 if (IS_ERR(task)) {
9737 ret = PTR_ERR(task);
9738 goto out;
9739 }
9740 ret = rpc_wait_for_completion_task(task);
9741 if (!ret)
9742 ret = task->tk_status;
9743 rpc_put_task(task);
9744 out:
9745 dprintk("<-- %s status=%d\n", __func__, ret);
9746 return ret;
9747 }
9748
9749 struct nfs4_reclaim_complete_data {
9750 struct nfs_client *clp;
9751 struct nfs41_reclaim_complete_args arg;
9752 struct nfs41_reclaim_complete_res res;
9753 };
9754
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9755 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9756 {
9757 struct nfs4_reclaim_complete_data *calldata = data;
9758
9759 nfs4_setup_sequence(calldata->clp,
9760 &calldata->arg.seq_args,
9761 &calldata->res.seq_res,
9762 task);
9763 }
9764
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9765 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9766 {
9767 switch(task->tk_status) {
9768 case 0:
9769 wake_up_all(&clp->cl_lock_waitq);
9770 fallthrough;
9771 case -NFS4ERR_COMPLETE_ALREADY:
9772 case -NFS4ERR_WRONG_CRED: /* What to do here? */
9773 break;
9774 case -NFS4ERR_DELAY:
9775 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9776 fallthrough;
9777 case -NFS4ERR_RETRY_UNCACHED_REP:
9778 case -EACCES:
9779 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9780 __func__, task->tk_status, clp->cl_hostname);
9781 return -EAGAIN;
9782 case -NFS4ERR_BADSESSION:
9783 case -NFS4ERR_DEADSESSION:
9784 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9785 break;
9786 default:
9787 nfs4_schedule_lease_recovery(clp);
9788 }
9789 return 0;
9790 }
9791
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9792 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9793 {
9794 struct nfs4_reclaim_complete_data *calldata = data;
9795 struct nfs_client *clp = calldata->clp;
9796 struct nfs4_sequence_res *res = &calldata->res.seq_res;
9797
9798 if (!nfs41_sequence_done(task, res))
9799 return;
9800
9801 trace_nfs4_reclaim_complete(clp, task->tk_status);
9802 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9803 rpc_restart_call_prepare(task);
9804 return;
9805 }
9806 }
9807
nfs4_free_reclaim_complete_data(void * data)9808 static void nfs4_free_reclaim_complete_data(void *data)
9809 {
9810 struct nfs4_reclaim_complete_data *calldata = data;
9811
9812 kfree(calldata);
9813 }
9814
9815 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9816 .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9817 .rpc_call_done = nfs4_reclaim_complete_done,
9818 .rpc_release = nfs4_free_reclaim_complete_data,
9819 };
9820
9821 /*
9822 * Issue a global reclaim complete.
9823 */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9824 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9825 const struct cred *cred)
9826 {
9827 struct nfs4_reclaim_complete_data *calldata;
9828 struct rpc_message msg = {
9829 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9830 .rpc_cred = cred,
9831 };
9832 struct rpc_task_setup task_setup_data = {
9833 .rpc_client = clp->cl_rpcclient,
9834 .rpc_message = &msg,
9835 .callback_ops = &nfs4_reclaim_complete_call_ops,
9836 .flags = RPC_TASK_NO_ROUND_ROBIN,
9837 };
9838 int status = -ENOMEM;
9839
9840 calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9841 if (calldata == NULL)
9842 goto out;
9843 calldata->clp = clp;
9844 calldata->arg.one_fs = 0;
9845
9846 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9847 msg.rpc_argp = &calldata->arg;
9848 msg.rpc_resp = &calldata->res;
9849 task_setup_data.callback_data = calldata;
9850 status = nfs4_call_sync_custom(&task_setup_data);
9851 out:
9852 dprintk("<-- %s status=%d\n", __func__, status);
9853 return status;
9854 }
9855
9856 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9857 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9858 {
9859 struct nfs4_layoutget *lgp = calldata;
9860 struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9861
9862 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9863 &lgp->res.seq_res, task);
9864 }
9865
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9866 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9867 {
9868 struct nfs4_layoutget *lgp = calldata;
9869
9870 nfs41_sequence_process(task, &lgp->res.seq_res);
9871 }
9872
9873 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9874 nfs4_layoutget_handle_exception(struct rpc_task *task,
9875 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9876 {
9877 struct inode *inode = lgp->args.inode;
9878 struct nfs_server *server = NFS_SERVER(inode);
9879 struct pnfs_layout_hdr *lo = lgp->lo;
9880 int nfs4err = task->tk_status;
9881 int err, status = 0;
9882 LIST_HEAD(head);
9883
9884 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9885
9886 nfs4_sequence_free_slot(&lgp->res.seq_res);
9887
9888 exception->state = NULL;
9889 exception->stateid = NULL;
9890
9891 switch (nfs4err) {
9892 case 0:
9893 goto out;
9894
9895 /*
9896 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9897 * on the file. set tk_status to -ENODATA to tell upper layer to
9898 * retry go inband.
9899 */
9900 case -NFS4ERR_LAYOUTUNAVAILABLE:
9901 status = -ENODATA;
9902 goto out;
9903 /*
9904 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9905 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9906 */
9907 case -NFS4ERR_BADLAYOUT:
9908 status = -EOVERFLOW;
9909 goto out;
9910 /*
9911 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9912 * (or clients) writing to the same RAID stripe except when
9913 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9914 *
9915 * Treat it like we would RECALLCONFLICT -- we retry for a little
9916 * while, and then eventually give up.
9917 */
9918 case -NFS4ERR_LAYOUTTRYLATER:
9919 if (lgp->args.minlength == 0) {
9920 status = -EOVERFLOW;
9921 goto out;
9922 }
9923 status = -EBUSY;
9924 break;
9925 case -NFS4ERR_RECALLCONFLICT:
9926 case -NFS4ERR_RETURNCONFLICT:
9927 status = -ERECALLCONFLICT;
9928 break;
9929 case -NFS4ERR_DELEG_REVOKED:
9930 case -NFS4ERR_ADMIN_REVOKED:
9931 case -NFS4ERR_EXPIRED:
9932 case -NFS4ERR_BAD_STATEID:
9933 exception->timeout = 0;
9934 spin_lock(&inode->i_lock);
9935 /* If the open stateid was bad, then recover it. */
9936 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9937 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9938 spin_unlock(&inode->i_lock);
9939 exception->state = lgp->args.ctx->state;
9940 exception->stateid = &lgp->args.stateid;
9941 break;
9942 }
9943
9944 /*
9945 * Mark the bad layout state as invalid, then retry
9946 */
9947 pnfs_mark_layout_stateid_invalid(lo, &head);
9948 spin_unlock(&inode->i_lock);
9949 nfs_commit_inode(inode, 0);
9950 pnfs_free_lseg_list(&head);
9951 status = -EAGAIN;
9952 goto out;
9953 }
9954
9955 err = nfs4_handle_exception(server, nfs4err, exception);
9956 if (!status) {
9957 if (exception->retry)
9958 status = -EAGAIN;
9959 else
9960 status = err;
9961 }
9962 out:
9963 return status;
9964 }
9965
max_response_pages(struct nfs_server * server)9966 size_t max_response_pages(struct nfs_server *server)
9967 {
9968 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9969 return nfs_page_array_len(0, max_resp_sz);
9970 }
9971
nfs4_layoutget_release(void * calldata)9972 static void nfs4_layoutget_release(void *calldata)
9973 {
9974 struct nfs4_layoutget *lgp = calldata;
9975
9976 nfs4_sequence_free_slot(&lgp->res.seq_res);
9977 pnfs_layoutget_free(lgp);
9978 }
9979
9980 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9981 .rpc_call_prepare = nfs4_layoutget_prepare,
9982 .rpc_call_done = nfs4_layoutget_done,
9983 .rpc_release = nfs4_layoutget_release,
9984 };
9985
9986 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9987 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9988 struct nfs4_exception *exception)
9989 {
9990 struct inode *inode = lgp->args.inode;
9991 struct nfs_server *server = NFS_SERVER(inode);
9992 struct rpc_task *task;
9993 struct rpc_message msg = {
9994 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9995 .rpc_argp = &lgp->args,
9996 .rpc_resp = &lgp->res,
9997 .rpc_cred = lgp->cred,
9998 };
9999 struct rpc_task_setup task_setup_data = {
10000 .rpc_client = server->client,
10001 .rpc_message = &msg,
10002 .callback_ops = &nfs4_layoutget_call_ops,
10003 .callback_data = lgp,
10004 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
10005 RPC_TASK_MOVEABLE,
10006 };
10007 struct pnfs_layout_segment *lseg = NULL;
10008 int status = 0;
10009
10010 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
10011 exception->retry = 0;
10012
10013 task = rpc_run_task(&task_setup_data);
10014 if (IS_ERR(task))
10015 return ERR_CAST(task);
10016
10017 status = rpc_wait_for_completion_task(task);
10018 if (status != 0)
10019 goto out;
10020
10021 if (task->tk_status < 0) {
10022 exception->retry = 1;
10023 status = nfs4_layoutget_handle_exception(task, lgp, exception);
10024 } else if (lgp->res.layoutp->len == 0) {
10025 exception->retry = 1;
10026 status = -EAGAIN;
10027 nfs4_update_delay(&exception->timeout);
10028 } else
10029 lseg = pnfs_layout_process(lgp);
10030 out:
10031 trace_nfs4_layoutget(lgp->args.ctx,
10032 &lgp->args.range,
10033 &lgp->res.range,
10034 &lgp->res.stateid,
10035 status);
10036
10037 rpc_put_task(task);
10038 dprintk("<-- %s status=%d\n", __func__, status);
10039 if (status)
10040 return ERR_PTR(status);
10041 return lseg;
10042 }
10043
10044 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)10045 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
10046 {
10047 struct nfs4_layoutreturn *lrp = calldata;
10048
10049 nfs4_setup_sequence(lrp->clp,
10050 &lrp->args.seq_args,
10051 &lrp->res.seq_res,
10052 task);
10053 if (!pnfs_layout_is_valid(lrp->args.layout))
10054 rpc_exit(task, 0);
10055 }
10056
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)10057 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
10058 {
10059 struct nfs4_layoutreturn *lrp = calldata;
10060 struct nfs_server *server;
10061
10062 if (!nfs41_sequence_process(task, &lrp->res.seq_res))
10063 return;
10064
10065 if (task->tk_rpc_status == -ETIMEDOUT) {
10066 lrp->rpc_status = -EAGAIN;
10067 lrp->res.lrs_present = 0;
10068 return;
10069 }
10070 /*
10071 * Was there an RPC level error? Assume the call succeeded,
10072 * and that we need to release the layout
10073 */
10074 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
10075 lrp->res.lrs_present = 0;
10076 return;
10077 }
10078
10079 server = NFS_SERVER(lrp->args.inode);
10080 switch (task->tk_status) {
10081 case -NFS4ERR_OLD_STATEID:
10082 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
10083 &lrp->args.range,
10084 lrp->args.inode))
10085 goto out_restart;
10086 fallthrough;
10087 default:
10088 task->tk_status = 0;
10089 lrp->res.lrs_present = 0;
10090 fallthrough;
10091 case 0:
10092 break;
10093 case -NFS4ERR_BADSESSION:
10094 case -NFS4ERR_DEADSESSION:
10095 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10096 nfs4_schedule_session_recovery(server->nfs_client->cl_session,
10097 task->tk_status);
10098 lrp->res.lrs_present = 0;
10099 lrp->rpc_status = -EAGAIN;
10100 task->tk_status = 0;
10101 break;
10102 case -NFS4ERR_DELAY:
10103 if (nfs4_async_handle_error(task, server, NULL, NULL) ==
10104 -EAGAIN)
10105 goto out_restart;
10106 lrp->res.lrs_present = 0;
10107 break;
10108 }
10109 return;
10110 out_restart:
10111 task->tk_status = 0;
10112 nfs4_sequence_free_slot(&lrp->res.seq_res);
10113 rpc_restart_call_prepare(task);
10114 }
10115
nfs4_layoutreturn_release(void * calldata)10116 static void nfs4_layoutreturn_release(void *calldata)
10117 {
10118 struct nfs4_layoutreturn *lrp = calldata;
10119 struct pnfs_layout_hdr *lo = lrp->args.layout;
10120
10121 if (lrp->rpc_status == 0 || !lrp->inode)
10122 pnfs_layoutreturn_free_lsegs(
10123 lo, &lrp->args.stateid, &lrp->args.range,
10124 lrp->res.lrs_present ? &lrp->res.stateid : NULL);
10125 else
10126 pnfs_layoutreturn_retry_later(lo, &lrp->args.stateid,
10127 &lrp->args.range);
10128 nfs4_sequence_free_slot(&lrp->res.seq_res);
10129 if (lrp->ld_private.ops && lrp->ld_private.ops->free)
10130 lrp->ld_private.ops->free(&lrp->ld_private);
10131 pnfs_put_layout_hdr(lrp->args.layout);
10132 nfs_iput_and_deactive(lrp->inode);
10133 put_cred(lrp->cred);
10134 kfree(calldata);
10135 }
10136
10137 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
10138 .rpc_call_prepare = nfs4_layoutreturn_prepare,
10139 .rpc_call_done = nfs4_layoutreturn_done,
10140 .rpc_release = nfs4_layoutreturn_release,
10141 };
10142
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,unsigned int flags)10143 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, unsigned int flags)
10144 {
10145 struct rpc_task *task;
10146 struct rpc_message msg = {
10147 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
10148 .rpc_argp = &lrp->args,
10149 .rpc_resp = &lrp->res,
10150 .rpc_cred = lrp->cred,
10151 };
10152 struct rpc_task_setup task_setup_data = {
10153 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
10154 .rpc_message = &msg,
10155 .callback_ops = &nfs4_layoutreturn_call_ops,
10156 .callback_data = lrp,
10157 .flags = RPC_TASK_MOVEABLE,
10158 };
10159 int status = 0;
10160
10161 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
10162 NFS_SP4_MACH_CRED_PNFS_CLEANUP,
10163 &task_setup_data.rpc_client, &msg);
10164
10165 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
10166 if (flags & PNFS_FL_LAYOUTRETURN_ASYNC) {
10167 if (!lrp->inode) {
10168 nfs4_layoutreturn_release(lrp);
10169 return -EAGAIN;
10170 }
10171 task_setup_data.flags |= RPC_TASK_ASYNC;
10172 }
10173 if (!lrp->inode)
10174 flags |= PNFS_FL_LAYOUTRETURN_PRIVILEGED;
10175 if (flags & PNFS_FL_LAYOUTRETURN_PRIVILEGED)
10176 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10177 1);
10178 else
10179 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10180 0);
10181 task = rpc_run_task(&task_setup_data);
10182 if (IS_ERR(task))
10183 return PTR_ERR(task);
10184 if (!(flags & PNFS_FL_LAYOUTRETURN_ASYNC))
10185 status = task->tk_status;
10186 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
10187 dprintk("<-- %s status=%d\n", __func__, status);
10188 rpc_put_task(task);
10189 return status;
10190 }
10191
10192 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)10193 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
10194 struct pnfs_device *pdev,
10195 const struct cred *cred)
10196 {
10197 struct nfs4_getdeviceinfo_args args = {
10198 .pdev = pdev,
10199 .notify_types = NOTIFY_DEVICEID4_CHANGE |
10200 NOTIFY_DEVICEID4_DELETE,
10201 };
10202 struct nfs4_getdeviceinfo_res res = {
10203 .pdev = pdev,
10204 };
10205 struct rpc_message msg = {
10206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
10207 .rpc_argp = &args,
10208 .rpc_resp = &res,
10209 .rpc_cred = cred,
10210 };
10211 int status;
10212
10213 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
10214 if (res.notification & ~args.notify_types)
10215 dprintk("%s: unsupported notification\n", __func__);
10216 if (res.notification != args.notify_types)
10217 pdev->nocache = 1;
10218
10219 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
10220
10221 dprintk("<-- %s status=%d\n", __func__, status);
10222
10223 return status;
10224 }
10225
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)10226 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
10227 struct pnfs_device *pdev,
10228 const struct cred *cred)
10229 {
10230 struct nfs4_exception exception = { };
10231 int err;
10232
10233 do {
10234 err = nfs4_handle_exception(server,
10235 _nfs4_proc_getdeviceinfo(server, pdev, cred),
10236 &exception);
10237 } while (exception.retry);
10238 return err;
10239 }
10240 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
10241
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)10242 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
10243 {
10244 struct nfs4_layoutcommit_data *data = calldata;
10245 struct nfs_server *server = NFS_SERVER(data->args.inode);
10246
10247 nfs4_setup_sequence(server->nfs_client,
10248 &data->args.seq_args,
10249 &data->res.seq_res,
10250 task);
10251 }
10252
10253 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)10254 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
10255 {
10256 struct nfs4_layoutcommit_data *data = calldata;
10257 struct nfs_server *server = NFS_SERVER(data->args.inode);
10258
10259 if (!nfs41_sequence_done(task, &data->res.seq_res))
10260 return;
10261
10262 switch (task->tk_status) { /* Just ignore these failures */
10263 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10264 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */
10265 case -NFS4ERR_BADLAYOUT: /* no layout */
10266 case -NFS4ERR_GRACE: /* loca_recalim always false */
10267 task->tk_status = 0;
10268 break;
10269 case 0:
10270 break;
10271 default:
10272 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10273 rpc_restart_call_prepare(task);
10274 return;
10275 }
10276 }
10277 }
10278
nfs4_layoutcommit_release(void * calldata)10279 static void nfs4_layoutcommit_release(void *calldata)
10280 {
10281 struct nfs4_layoutcommit_data *data = calldata;
10282
10283 pnfs_cleanup_layoutcommit(data);
10284 nfs_post_op_update_inode_force_wcc(data->args.inode,
10285 data->res.fattr);
10286 put_cred(data->cred);
10287 nfs_iput_and_deactive(data->inode);
10288 kfree(data);
10289 }
10290
10291 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10292 .rpc_call_prepare = nfs4_layoutcommit_prepare,
10293 .rpc_call_done = nfs4_layoutcommit_done,
10294 .rpc_release = nfs4_layoutcommit_release,
10295 };
10296
10297 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)10298 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10299 {
10300 struct rpc_message msg = {
10301 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10302 .rpc_argp = &data->args,
10303 .rpc_resp = &data->res,
10304 .rpc_cred = data->cred,
10305 };
10306 struct rpc_task_setup task_setup_data = {
10307 .task = &data->task,
10308 .rpc_client = NFS_CLIENT(data->args.inode),
10309 .rpc_message = &msg,
10310 .callback_ops = &nfs4_layoutcommit_ops,
10311 .callback_data = data,
10312 .flags = RPC_TASK_MOVEABLE,
10313 };
10314 struct rpc_task *task;
10315 int status = 0;
10316
10317 dprintk("NFS: initiating layoutcommit call. sync %d "
10318 "lbw: %llu inode %lu\n", sync,
10319 data->args.lastbytewritten,
10320 data->args.inode->i_ino);
10321
10322 if (!sync) {
10323 data->inode = nfs_igrab_and_active(data->args.inode);
10324 if (data->inode == NULL) {
10325 nfs4_layoutcommit_release(data);
10326 return -EAGAIN;
10327 }
10328 task_setup_data.flags = RPC_TASK_ASYNC;
10329 }
10330 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10331 task = rpc_run_task(&task_setup_data);
10332 if (IS_ERR(task))
10333 return PTR_ERR(task);
10334 if (sync)
10335 status = task->tk_status;
10336 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10337 dprintk("%s: status %d\n", __func__, status);
10338 rpc_put_task(task);
10339 return status;
10340 }
10341
10342 /*
10343 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10344 * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10345 */
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_secinfo_flavors * flavors,bool use_integrity)10346 static int _nfs41_proc_secinfo_no_name(struct nfs_server *server,
10347 struct nfs_fh *fhandle,
10348 struct nfs4_secinfo_flavors *flavors,
10349 bool use_integrity)
10350 {
10351 struct nfs41_secinfo_no_name_args args = {
10352 .style = SECINFO_STYLE_CURRENT_FH,
10353 };
10354 struct nfs4_secinfo_res res = {
10355 .flavors = flavors,
10356 };
10357 struct rpc_message msg = {
10358 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10359 .rpc_argp = &args,
10360 .rpc_resp = &res,
10361 };
10362 struct nfs4_call_sync_data data = {
10363 .seq_server = server,
10364 .seq_args = &args.seq_args,
10365 .seq_res = &res.seq_res,
10366 };
10367 struct rpc_task_setup task_setup = {
10368 .rpc_client = server->client,
10369 .rpc_message = &msg,
10370 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10371 .callback_data = &data,
10372 .flags = RPC_TASK_NO_ROUND_ROBIN,
10373 };
10374 const struct cred *cred = NULL;
10375 int status;
10376
10377 if (use_integrity) {
10378 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10379
10380 cred = nfs4_get_clid_cred(server->nfs_client);
10381 msg.rpc_cred = cred;
10382 }
10383
10384 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10385 status = nfs4_call_sync_custom(&task_setup);
10386 dprintk("<-- %s status=%d\n", __func__, status);
10387
10388 put_cred(cred);
10389
10390 return status;
10391 }
10392
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_secinfo_flavors * flavors)10393 static int nfs41_proc_secinfo_no_name(struct nfs_server *server,
10394 struct nfs_fh *fhandle,
10395 struct nfs4_secinfo_flavors *flavors)
10396 {
10397 struct nfs4_exception exception = {
10398 .interruptible = true,
10399 };
10400 int err;
10401 do {
10402 /* first try using integrity protection */
10403 err = -NFS4ERR_WRONGSEC;
10404
10405 /* try to use integrity protection with machine cred */
10406 if (_nfs4_is_integrity_protected(server->nfs_client))
10407 err = _nfs41_proc_secinfo_no_name(server, fhandle,
10408 flavors, true);
10409
10410 /*
10411 * if unable to use integrity protection, or SECINFO with
10412 * integrity protection returns NFS4ERR_WRONGSEC (which is
10413 * disallowed by spec, but exists in deployed servers) use
10414 * the current filesystem's rpc_client and the user cred.
10415 */
10416 if (err == -NFS4ERR_WRONGSEC)
10417 err = _nfs41_proc_secinfo_no_name(server, fhandle,
10418 flavors, false);
10419
10420 switch (err) {
10421 case 0:
10422 case -NFS4ERR_WRONGSEC:
10423 case -ENOTSUPP:
10424 goto out;
10425 default:
10426 err = nfs4_handle_exception(server, err, &exception);
10427 }
10428 } while (exception.retry);
10429 out:
10430 return err;
10431 }
10432
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr)10433 static int nfs41_find_root_sec(struct nfs_server *server,
10434 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
10435 {
10436 int err;
10437 struct page *page;
10438 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10439 struct nfs4_secinfo_flavors *flavors;
10440 struct nfs4_secinfo4 *secinfo;
10441 int i;
10442
10443 page = alloc_page(GFP_KERNEL);
10444 if (!page) {
10445 err = -ENOMEM;
10446 goto out;
10447 }
10448
10449 flavors = page_address(page);
10450 err = nfs41_proc_secinfo_no_name(server, fhandle, flavors);
10451
10452 /*
10453 * Fall back on "guess and check" method if
10454 * the server doesn't support SECINFO_NO_NAME
10455 */
10456 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10457 err = nfs4_find_root_sec(server, fhandle, fattr);
10458 goto out_freepage;
10459 }
10460 if (err)
10461 goto out_freepage;
10462
10463 for (i = 0; i < flavors->num_flavors; i++) {
10464 secinfo = &flavors->flavors[i];
10465
10466 switch (secinfo->flavor) {
10467 case RPC_AUTH_NULL:
10468 case RPC_AUTH_UNIX:
10469 case RPC_AUTH_GSS:
10470 flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10471 &secinfo->flavor_info);
10472 break;
10473 default:
10474 flavor = RPC_AUTH_MAXFLAVOR;
10475 break;
10476 }
10477
10478 if (!nfs_auth_info_match(&server->auth_info, flavor))
10479 flavor = RPC_AUTH_MAXFLAVOR;
10480
10481 if (flavor != RPC_AUTH_MAXFLAVOR) {
10482 err = nfs4_lookup_root_sec(server, fhandle, fattr,
10483 flavor);
10484 if (!err)
10485 break;
10486 }
10487 }
10488
10489 if (flavor == RPC_AUTH_MAXFLAVOR)
10490 err = -EPERM;
10491
10492 out_freepage:
10493 put_page(page);
10494 if (err == -EACCES)
10495 return -EPERM;
10496 out:
10497 return err;
10498 }
10499
_nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10500 static int _nfs41_test_stateid(struct nfs_server *server,
10501 const nfs4_stateid *stateid,
10502 const struct cred *cred)
10503 {
10504 int status;
10505 struct nfs41_test_stateid_args args = {
10506 .stateid = *stateid,
10507 };
10508 struct nfs41_test_stateid_res res;
10509 struct rpc_message msg = {
10510 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10511 .rpc_argp = &args,
10512 .rpc_resp = &res,
10513 .rpc_cred = cred,
10514 };
10515 struct rpc_clnt *rpc_client = server->client;
10516
10517 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10518 &rpc_client, &msg);
10519
10520 dprintk("NFS call test_stateid %p\n", stateid);
10521 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10522 status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10523 &args.seq_args, &res.seq_res);
10524 if (status != NFS_OK) {
10525 dprintk("NFS reply test_stateid: failed, %d\n", status);
10526 return status;
10527 }
10528 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10529 return -res.status;
10530 }
10531
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10532 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10533 int err, struct nfs4_exception *exception)
10534 {
10535 exception->retry = 0;
10536 switch(err) {
10537 case -NFS4ERR_DELAY:
10538 case -NFS4ERR_RETRY_UNCACHED_REP:
10539 nfs4_handle_exception(server, err, exception);
10540 break;
10541 case -NFS4ERR_BADSESSION:
10542 case -NFS4ERR_BADSLOT:
10543 case -NFS4ERR_BAD_HIGH_SLOT:
10544 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10545 case -NFS4ERR_DEADSESSION:
10546 nfs4_do_handle_exception(server, err, exception);
10547 }
10548 }
10549
10550 /**
10551 * nfs41_test_stateid - perform a TEST_STATEID operation
10552 *
10553 * @server: server / transport on which to perform the operation
10554 * @stateid: state ID to test
10555 * @cred: credential
10556 *
10557 * Returns NFS_OK if the server recognizes that "stateid" is valid.
10558 * Otherwise a negative NFS4ERR value is returned if the operation
10559 * failed or the state ID is not currently valid.
10560 */
nfs41_test_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)10561 static int nfs41_test_stateid(struct nfs_server *server,
10562 const nfs4_stateid *stateid,
10563 const struct cred *cred)
10564 {
10565 struct nfs4_exception exception = {
10566 .interruptible = true,
10567 };
10568 int err;
10569 do {
10570 err = _nfs41_test_stateid(server, stateid, cred);
10571 nfs4_handle_delay_or_session_error(server, err, &exception);
10572 } while (exception.retry);
10573 return err;
10574 }
10575
10576 struct nfs_free_stateid_data {
10577 struct nfs_server *server;
10578 struct nfs41_free_stateid_args args;
10579 struct nfs41_free_stateid_res res;
10580 };
10581
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10582 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10583 {
10584 struct nfs_free_stateid_data *data = calldata;
10585 nfs4_setup_sequence(data->server->nfs_client,
10586 &data->args.seq_args,
10587 &data->res.seq_res,
10588 task);
10589 }
10590
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10591 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10592 {
10593 struct nfs_free_stateid_data *data = calldata;
10594
10595 nfs41_sequence_done(task, &data->res.seq_res);
10596
10597 switch (task->tk_status) {
10598 case -NFS4ERR_DELAY:
10599 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10600 rpc_restart_call_prepare(task);
10601 }
10602 }
10603
nfs41_free_stateid_release(void * calldata)10604 static void nfs41_free_stateid_release(void *calldata)
10605 {
10606 struct nfs_free_stateid_data *data = calldata;
10607 struct nfs_client *clp = data->server->nfs_client;
10608
10609 nfs_put_client(clp);
10610 kfree(calldata);
10611 }
10612
10613 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10614 .rpc_call_prepare = nfs41_free_stateid_prepare,
10615 .rpc_call_done = nfs41_free_stateid_done,
10616 .rpc_release = nfs41_free_stateid_release,
10617 };
10618
10619 /**
10620 * nfs41_free_stateid - perform a FREE_STATEID operation
10621 *
10622 * @server: server / transport on which to perform the operation
10623 * @stateid: state ID to release
10624 * @cred: credential
10625 * @privileged: set to true if this call needs to be privileged
10626 *
10627 * Note: this function is always asynchronous.
10628 */
nfs41_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred,bool privileged)10629 static int nfs41_free_stateid(struct nfs_server *server,
10630 nfs4_stateid *stateid,
10631 const struct cred *cred,
10632 bool privileged)
10633 {
10634 struct rpc_message msg = {
10635 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10636 .rpc_cred = cred,
10637 };
10638 struct rpc_task_setup task_setup = {
10639 .rpc_client = server->client,
10640 .rpc_message = &msg,
10641 .callback_ops = &nfs41_free_stateid_ops,
10642 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10643 };
10644 struct nfs_free_stateid_data *data;
10645 struct rpc_task *task;
10646 struct nfs_client *clp = server->nfs_client;
10647
10648 if (!refcount_inc_not_zero(&clp->cl_count))
10649 return -EIO;
10650
10651 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10652 &task_setup.rpc_client, &msg);
10653
10654 dprintk("NFS call free_stateid %p\n", stateid);
10655 data = kmalloc(sizeof(*data), GFP_KERNEL);
10656 if (!data)
10657 return -ENOMEM;
10658 data->server = server;
10659 nfs4_stateid_copy(&data->args.stateid, stateid);
10660
10661 task_setup.callback_data = data;
10662
10663 msg.rpc_argp = &data->args;
10664 msg.rpc_resp = &data->res;
10665 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10666 task = rpc_run_task(&task_setup);
10667 if (IS_ERR(task))
10668 return PTR_ERR(task);
10669 rpc_put_task(task);
10670 stateid->type = NFS4_FREED_STATEID_TYPE;
10671 return 0;
10672 }
10673
10674 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10675 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10676 {
10677 const struct cred *cred = lsp->ls_state->owner->so_cred;
10678
10679 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10680 nfs4_free_lock_state(server, lsp);
10681 }
10682
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10683 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10684 const nfs4_stateid *s2)
10685 {
10686 trace_nfs41_match_stateid(s1, s2);
10687
10688 if (s1->type != s2->type)
10689 return false;
10690
10691 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10692 return false;
10693
10694 if (s1->seqid == s2->seqid)
10695 return true;
10696
10697 return s1->seqid == 0 || s2->seqid == 0;
10698 }
10699
10700 #endif /* CONFIG_NFS_V4_1 */
10701
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10702 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10703 const nfs4_stateid *s2)
10704 {
10705 trace_nfs4_match_stateid(s1, s2);
10706
10707 return nfs4_stateid_match(s1, s2);
10708 }
10709
10710
10711 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10712 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10713 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10714 .recover_open = nfs4_open_reclaim,
10715 .recover_lock = nfs4_lock_reclaim,
10716 .establish_clid = nfs4_init_clientid,
10717 .detect_trunking = nfs40_discover_server_trunking,
10718 };
10719
10720 #if defined(CONFIG_NFS_V4_1)
10721 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10722 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10723 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10724 .recover_open = nfs4_open_reclaim,
10725 .recover_lock = nfs4_lock_reclaim,
10726 .establish_clid = nfs41_init_clientid,
10727 .reclaim_complete = nfs41_proc_reclaim_complete,
10728 .detect_trunking = nfs41_discover_server_trunking,
10729 };
10730 #endif /* CONFIG_NFS_V4_1 */
10731
10732 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10733 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10734 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10735 .recover_open = nfs40_open_expired,
10736 .recover_lock = nfs4_lock_expired,
10737 .establish_clid = nfs4_init_clientid,
10738 };
10739
10740 #if defined(CONFIG_NFS_V4_1)
10741 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10742 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10743 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10744 .recover_open = nfs41_open_expired,
10745 .recover_lock = nfs41_lock_expired,
10746 .establish_clid = nfs41_init_clientid,
10747 };
10748 #endif /* CONFIG_NFS_V4_1 */
10749
10750 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10751 .sched_state_renewal = nfs4_proc_async_renew,
10752 .get_state_renewal_cred = nfs4_get_renew_cred,
10753 .renew_lease = nfs4_proc_renew,
10754 };
10755
10756 #if defined(CONFIG_NFS_V4_1)
10757 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10758 .sched_state_renewal = nfs41_proc_async_sequence,
10759 .get_state_renewal_cred = nfs4_get_machine_cred,
10760 .renew_lease = nfs4_proc_sequence,
10761 };
10762 #endif
10763
10764 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10765 .get_locations = _nfs40_proc_get_locations,
10766 .fsid_present = _nfs40_proc_fsid_present,
10767 };
10768
10769 #if defined(CONFIG_NFS_V4_1)
10770 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10771 .get_locations = _nfs41_proc_get_locations,
10772 .fsid_present = _nfs41_proc_fsid_present,
10773 };
10774 #endif /* CONFIG_NFS_V4_1 */
10775
10776 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10777 .minor_version = 0,
10778 .init_caps = NFS_CAP_READDIRPLUS
10779 | NFS_CAP_ATOMIC_OPEN
10780 | NFS_CAP_POSIX_LOCK,
10781 .init_client = nfs40_init_client,
10782 .shutdown_client = nfs40_shutdown_client,
10783 .match_stateid = nfs4_match_stateid,
10784 .find_root_sec = nfs4_find_root_sec,
10785 .free_lock_state = nfs4_release_lockowner,
10786 .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10787 .alloc_seqid = nfs_alloc_seqid,
10788 .call_sync_ops = &nfs40_call_sync_ops,
10789 .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10790 .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10791 .state_renewal_ops = &nfs40_state_renewal_ops,
10792 .mig_recovery_ops = &nfs40_mig_recovery_ops,
10793 };
10794
10795 #if defined(CONFIG_NFS_V4_1)
10796 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10797 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10798 {
10799 return NULL;
10800 }
10801
10802 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10803 .minor_version = 1,
10804 .init_caps = NFS_CAP_READDIRPLUS
10805 | NFS_CAP_ATOMIC_OPEN
10806 | NFS_CAP_POSIX_LOCK
10807 | NFS_CAP_STATEID_NFSV41
10808 | NFS_CAP_ATOMIC_OPEN_V1
10809 | NFS_CAP_LGOPEN
10810 | NFS_CAP_MOVEABLE,
10811 .init_client = nfs41_init_client,
10812 .shutdown_client = nfs41_shutdown_client,
10813 .match_stateid = nfs41_match_stateid,
10814 .find_root_sec = nfs41_find_root_sec,
10815 .free_lock_state = nfs41_free_lock_state,
10816 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10817 .alloc_seqid = nfs_alloc_no_seqid,
10818 .session_trunk = nfs4_test_session_trunk,
10819 .call_sync_ops = &nfs41_call_sync_ops,
10820 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10821 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10822 .state_renewal_ops = &nfs41_state_renewal_ops,
10823 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10824 };
10825 #endif
10826
10827 #if defined(CONFIG_NFS_V4_2)
10828 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10829 .minor_version = 2,
10830 .init_caps = NFS_CAP_READDIRPLUS
10831 | NFS_CAP_ATOMIC_OPEN
10832 | NFS_CAP_POSIX_LOCK
10833 | NFS_CAP_STATEID_NFSV41
10834 | NFS_CAP_ATOMIC_OPEN_V1
10835 | NFS_CAP_LGOPEN
10836 | NFS_CAP_ALLOCATE
10837 | NFS_CAP_COPY
10838 | NFS_CAP_OFFLOAD_CANCEL
10839 | NFS_CAP_COPY_NOTIFY
10840 | NFS_CAP_DEALLOCATE
10841 | NFS_CAP_ZERO_RANGE
10842 | NFS_CAP_SEEK
10843 | NFS_CAP_LAYOUTSTATS
10844 | NFS_CAP_CLONE
10845 | NFS_CAP_LAYOUTERROR
10846 | NFS_CAP_READ_PLUS
10847 | NFS_CAP_MOVEABLE
10848 | NFS_CAP_OFFLOAD_STATUS,
10849 .init_client = nfs41_init_client,
10850 .shutdown_client = nfs41_shutdown_client,
10851 .match_stateid = nfs41_match_stateid,
10852 .find_root_sec = nfs41_find_root_sec,
10853 .free_lock_state = nfs41_free_lock_state,
10854 .call_sync_ops = &nfs41_call_sync_ops,
10855 .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10856 .alloc_seqid = nfs_alloc_no_seqid,
10857 .session_trunk = nfs4_test_session_trunk,
10858 .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10859 .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10860 .state_renewal_ops = &nfs41_state_renewal_ops,
10861 .mig_recovery_ops = &nfs41_mig_recovery_ops,
10862 };
10863 #endif
10864
10865 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10866 [0] = &nfs_v4_0_minor_ops,
10867 #if defined(CONFIG_NFS_V4_1)
10868 [1] = &nfs_v4_1_minor_ops,
10869 #endif
10870 #if defined(CONFIG_NFS_V4_2)
10871 [2] = &nfs_v4_2_minor_ops,
10872 #endif
10873 };
10874
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10875 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10876 {
10877 ssize_t error, error2, error3, error4 = 0;
10878 size_t left = size;
10879
10880 error = generic_listxattr(dentry, list, left);
10881 if (error < 0)
10882 return error;
10883 if (list) {
10884 list += error;
10885 left -= error;
10886 }
10887
10888 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10889 if (error2 < 0)
10890 return error2;
10891
10892 if (list) {
10893 list += error2;
10894 left -= error2;
10895 }
10896
10897 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10898 if (error3 < 0)
10899 return error3;
10900 if (list) {
10901 list += error3;
10902 left -= error3;
10903 }
10904
10905 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_SECURITY_LABEL)) {
10906 error4 = security_inode_listsecurity(d_inode(dentry), list, left);
10907 if (error4 < 0)
10908 return error4;
10909 }
10910
10911 error += error2 + error3 + error4;
10912 if (size && error > size)
10913 return -ERANGE;
10914 return error;
10915 }
10916
nfs4_enable_swap(struct inode * inode)10917 static void nfs4_enable_swap(struct inode *inode)
10918 {
10919 /* The state manager thread must always be running.
10920 * It will notice the client is a swapper, and stay put.
10921 */
10922 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10923
10924 nfs4_schedule_state_manager(clp);
10925 }
10926
nfs4_disable_swap(struct inode * inode)10927 static void nfs4_disable_swap(struct inode *inode)
10928 {
10929 /* The state manager thread will now exit once it is
10930 * woken.
10931 */
10932 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10933
10934 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10935 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10936 wake_up_var(&clp->cl_state);
10937 }
10938
10939 static const struct inode_operations nfs4_dir_inode_operations = {
10940 .create = nfs_create,
10941 .lookup = nfs_lookup,
10942 .atomic_open = nfs_atomic_open,
10943 .link = nfs_link,
10944 .unlink = nfs_unlink,
10945 .symlink = nfs_symlink,
10946 .mkdir = nfs_mkdir,
10947 .rmdir = nfs_rmdir,
10948 .mknod = nfs_mknod,
10949 .rename = nfs_rename,
10950 .permission = nfs_permission,
10951 .getattr = nfs_getattr,
10952 .setattr = nfs_setattr,
10953 .listxattr = nfs4_listxattr,
10954 };
10955
10956 static const struct inode_operations nfs4_file_inode_operations = {
10957 .permission = nfs_permission,
10958 .getattr = nfs_getattr,
10959 .setattr = nfs_setattr,
10960 .listxattr = nfs4_listxattr,
10961 };
10962
nfs4_clone_server(struct nfs_server * source,struct nfs_fh * fh,struct nfs_fattr * fattr,rpc_authflavor_t flavor)10963 static struct nfs_server *nfs4_clone_server(struct nfs_server *source,
10964 struct nfs_fh *fh, struct nfs_fattr *fattr,
10965 rpc_authflavor_t flavor)
10966 {
10967 struct nfs_server *server;
10968 int error;
10969
10970 server = nfs_clone_server(source, fh, fattr, flavor);
10971 if (IS_ERR(server))
10972 return server;
10973
10974 error = nfs4_delegation_hash_alloc(server);
10975 if (error) {
10976 nfs_free_server(server);
10977 return ERR_PTR(error);
10978 }
10979
10980 return server;
10981 }
10982
10983 const struct nfs_rpc_ops nfs_v4_clientops = {
10984 .version = 4, /* protocol version */
10985 .dentry_ops = &nfs4_dentry_operations,
10986 .dir_inode_ops = &nfs4_dir_inode_operations,
10987 .file_inode_ops = &nfs4_file_inode_operations,
10988 .file_ops = &nfs4_file_operations,
10989 .getroot = nfs4_proc_get_root,
10990 .submount = nfs4_submount,
10991 .try_get_tree = nfs4_try_get_tree,
10992 .getattr = nfs4_proc_getattr,
10993 .setattr = nfs4_proc_setattr,
10994 .lookup = nfs4_proc_lookup,
10995 .lookupp = nfs4_proc_lookupp,
10996 .access = nfs4_proc_access,
10997 .readlink = nfs4_proc_readlink,
10998 .create = nfs4_proc_create,
10999 .remove = nfs4_proc_remove,
11000 .unlink_setup = nfs4_proc_unlink_setup,
11001 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
11002 .unlink_done = nfs4_proc_unlink_done,
11003 .rename_setup = nfs4_proc_rename_setup,
11004 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
11005 .rename_done = nfs4_proc_rename_done,
11006 .link = nfs4_proc_link,
11007 .symlink = nfs4_proc_symlink,
11008 .mkdir = nfs4_proc_mkdir,
11009 .rmdir = nfs4_proc_rmdir,
11010 .readdir = nfs4_proc_readdir,
11011 .mknod = nfs4_proc_mknod,
11012 .statfs = nfs4_proc_statfs,
11013 .fsinfo = nfs4_proc_fsinfo,
11014 .pathconf = nfs4_proc_pathconf,
11015 .set_capabilities = nfs4_server_capabilities,
11016 .decode_dirent = nfs4_decode_dirent,
11017 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
11018 .read_setup = nfs4_proc_read_setup,
11019 .read_done = nfs4_read_done,
11020 .write_setup = nfs4_proc_write_setup,
11021 .write_done = nfs4_write_done,
11022 .commit_setup = nfs4_proc_commit_setup,
11023 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
11024 .commit_done = nfs4_commit_done,
11025 .lock = nfs4_proc_lock,
11026 .clear_acl_cache = nfs4_zap_acl_attr,
11027 .close_context = nfs4_close_context,
11028 .open_context = nfs4_atomic_open,
11029 .have_delegation = nfs4_have_delegation,
11030 .return_delegation = nfs4_inode_return_delegation,
11031 .alloc_client = nfs4_alloc_client,
11032 .init_client = nfs4_init_client,
11033 .free_client = nfs4_free_client,
11034 .create_server = nfs4_create_server,
11035 .clone_server = nfs4_clone_server,
11036 .discover_trunking = nfs4_discover_trunking,
11037 .enable_swap = nfs4_enable_swap,
11038 .disable_swap = nfs4_disable_swap,
11039 };
11040
11041 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
11042 .name = XATTR_NAME_NFSV4_ACL,
11043 .list = nfs4_xattr_list_nfs4_acl,
11044 .get = nfs4_xattr_get_nfs4_acl,
11045 .set = nfs4_xattr_set_nfs4_acl,
11046 };
11047
11048 #if defined(CONFIG_NFS_V4_1)
11049 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
11050 .name = XATTR_NAME_NFSV4_DACL,
11051 .list = nfs4_xattr_list_nfs4_dacl,
11052 .get = nfs4_xattr_get_nfs4_dacl,
11053 .set = nfs4_xattr_set_nfs4_dacl,
11054 };
11055
11056 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
11057 .name = XATTR_NAME_NFSV4_SACL,
11058 .list = nfs4_xattr_list_nfs4_sacl,
11059 .get = nfs4_xattr_get_nfs4_sacl,
11060 .set = nfs4_xattr_set_nfs4_sacl,
11061 };
11062 #endif
11063
11064 #ifdef CONFIG_NFS_V4_2
11065 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
11066 .prefix = XATTR_USER_PREFIX,
11067 .get = nfs4_xattr_get_nfs4_user,
11068 .set = nfs4_xattr_set_nfs4_user,
11069 };
11070 #endif
11071
11072 const struct xattr_handler * const nfs4_xattr_handlers[] = {
11073 &nfs4_xattr_nfs4_acl_handler,
11074 #if defined(CONFIG_NFS_V4_1)
11075 &nfs4_xattr_nfs4_dacl_handler,
11076 &nfs4_xattr_nfs4_sacl_handler,
11077 #endif
11078 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
11079 &nfs4_xattr_nfs4_label_handler,
11080 #endif
11081 #ifdef CONFIG_NFS_V4_2
11082 &nfs4_xattr_nfs4_user_handler,
11083 #endif
11084 NULL
11085 };
11086