1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 */
16
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/sched/signal.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/stat.h>
25 #include <linux/errno.h>
26 #include <linux/unistd.h>
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/stats.h>
29 #include <linux/sunrpc/metrics.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_mount.h>
32 #include <linux/nfs4_mount.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
42 #include <linux/uaccess.h>
43 #include <linux/iversion.h>
44
45 #include "nfs4_fs.h"
46 #include "callback.h"
47 #include "delegation.h"
48 #include "iostat.h"
49 #include "internal.h"
50 #include "fscache.h"
51 #include "pnfs.h"
52 #include "nfs.h"
53 #include "netns.h"
54 #include "sysfs.h"
55
56 #include "nfstrace.h"
57
58 #define NFSDBG_FACILITY NFSDBG_VFS
59
60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62 /* Default is to see 64-bit inode numbers */
63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67 static struct kmem_cache * nfs_inode_cachep;
68
69 static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr * fattr)70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 {
72 return nfs_fileid_to_ino_t(fattr->fileid);
73 }
74
nfs_wait_bit_killable(struct wait_bit_key * key,int mode)75 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
76 {
77 if (unlikely(nfs_current_task_exiting()))
78 return -EINTR;
79 schedule();
80 if (signal_pending_state(mode, current))
81 return -ERESTARTSYS;
82 return 0;
83 }
84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
85
86 /**
87 * nfs_compat_user_ino64 - returns the user-visible inode number
88 * @fileid: 64-bit fileid
89 *
90 * This function returns a 32-bit inode number if the boot parameter
91 * nfs.enable_ino64 is zero.
92 */
nfs_compat_user_ino64(u64 fileid)93 u64 nfs_compat_user_ino64(u64 fileid)
94 {
95 #ifdef CONFIG_COMPAT
96 compat_ulong_t ino;
97 #else
98 unsigned long ino;
99 #endif
100
101 if (enable_ino64)
102 return fileid;
103 ino = fileid;
104 if (sizeof(ino) < sizeof(fileid))
105 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
106 return ino;
107 }
108
nfs_drop_inode(struct inode * inode)109 int nfs_drop_inode(struct inode *inode)
110 {
111 return NFS_STALE(inode) || generic_drop_inode(inode);
112 }
113 EXPORT_SYMBOL_GPL(nfs_drop_inode);
114
nfs_clear_inode(struct inode * inode)115 void nfs_clear_inode(struct inode *inode)
116 {
117 /*
118 * The following should never happen...
119 */
120 WARN_ON_ONCE(nfs_have_writebacks(inode));
121 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
122 nfs_zap_acl_cache(inode);
123 nfs_access_zap_cache(inode);
124 nfs_fscache_clear_inode(inode);
125 }
126 EXPORT_SYMBOL_GPL(nfs_clear_inode);
127
nfs_evict_inode(struct inode * inode)128 void nfs_evict_inode(struct inode *inode)
129 {
130 truncate_inode_pages_final(&inode->i_data);
131 clear_inode(inode);
132 nfs_clear_inode(inode);
133 }
134
nfs_sync_inode(struct inode * inode)135 int nfs_sync_inode(struct inode *inode)
136 {
137 inode_dio_wait(inode);
138 return nfs_wb_all(inode);
139 }
140 EXPORT_SYMBOL_GPL(nfs_sync_inode);
141
142 /**
143 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
144 * @mapping: pointer to struct address_space
145 */
nfs_sync_mapping(struct address_space * mapping)146 int nfs_sync_mapping(struct address_space *mapping)
147 {
148 int ret = 0;
149
150 if (mapping->nrpages != 0) {
151 unmap_mapping_range(mapping, 0, 0, 0);
152 ret = nfs_wb_all(mapping->host);
153 }
154 return ret;
155 }
156
nfs_attribute_timeout(struct inode * inode)157 static int nfs_attribute_timeout(struct inode *inode)
158 {
159 struct nfs_inode *nfsi = NFS_I(inode);
160
161 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
162 }
163
nfs_check_cache_flags_invalid(struct inode * inode,unsigned long flags)164 static bool nfs_check_cache_flags_invalid(struct inode *inode,
165 unsigned long flags)
166 {
167 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
168
169 return (cache_validity & flags) != 0;
170 }
171
nfs_check_cache_invalid(struct inode * inode,unsigned long flags)172 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
173 {
174 if (nfs_check_cache_flags_invalid(inode, flags))
175 return true;
176 return nfs_attribute_cache_expired(inode);
177 }
178 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
179
180 #ifdef CONFIG_NFS_V4_2
nfs_has_xattr_cache(const struct nfs_inode * nfsi)181 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
182 {
183 return nfsi->xattr_cache != NULL;
184 }
185 #else
nfs_has_xattr_cache(const struct nfs_inode * nfsi)186 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
187 {
188 return false;
189 }
190 #endif
191
nfs_set_cache_invalid(struct inode * inode,unsigned long flags)192 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
193 {
194 struct nfs_inode *nfsi = NFS_I(inode);
195
196 if (nfs_have_delegated_attributes(inode)) {
197 if (!(flags & NFS_INO_REVAL_FORCED))
198 flags &= ~(NFS_INO_INVALID_MODE |
199 NFS_INO_INVALID_OTHER |
200 NFS_INO_INVALID_BTIME |
201 NFS_INO_INVALID_XATTR);
202 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
203 }
204
205 if (!nfs_has_xattr_cache(nfsi))
206 flags &= ~NFS_INO_INVALID_XATTR;
207 if (flags & NFS_INO_INVALID_DATA)
208 nfs_fscache_invalidate(inode, 0);
209 flags &= ~NFS_INO_REVAL_FORCED;
210
211 flags |= nfsi->cache_validity;
212 if (inode->i_mapping->nrpages == 0)
213 flags &= ~NFS_INO_INVALID_DATA;
214
215 /* pairs with nfs_clear_invalid_mapping()'s smp_load_acquire() */
216 smp_store_release(&nfsi->cache_validity, flags);
217
218 if (inode->i_mapping->nrpages == 0 ||
219 nfsi->cache_validity & NFS_INO_INVALID_DATA) {
220 nfs_ooo_clear(nfsi);
221 }
222 trace_nfs_set_cache_invalid(inode, 0);
223 }
224 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
225
226 /*
227 * Invalidate the local caches
228 */
nfs_zap_caches_locked(struct inode * inode)229 static void nfs_zap_caches_locked(struct inode *inode)
230 {
231 struct nfs_inode *nfsi = NFS_I(inode);
232 int mode = inode->i_mode;
233
234 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
235
236 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
237 nfsi->attrtimeo_timestamp = jiffies;
238
239 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
240 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
241 NFS_INO_INVALID_DATA |
242 NFS_INO_INVALID_ACCESS |
243 NFS_INO_INVALID_ACL |
244 NFS_INO_INVALID_XATTR);
245 else
246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
247 NFS_INO_INVALID_ACCESS |
248 NFS_INO_INVALID_ACL |
249 NFS_INO_INVALID_XATTR);
250 nfs_zap_label_cache_locked(nfsi);
251 }
252
nfs_zap_caches(struct inode * inode)253 void nfs_zap_caches(struct inode *inode)
254 {
255 spin_lock(&inode->i_lock);
256 nfs_zap_caches_locked(inode);
257 spin_unlock(&inode->i_lock);
258 }
259
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)260 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
261 {
262 if (mapping->nrpages != 0) {
263 spin_lock(&inode->i_lock);
264 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
265 spin_unlock(&inode->i_lock);
266 }
267 }
268
nfs_zap_acl_cache(struct inode * inode)269 void nfs_zap_acl_cache(struct inode *inode)
270 {
271 void (*clear_acl_cache)(struct inode *);
272
273 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
274 if (clear_acl_cache != NULL)
275 clear_acl_cache(inode);
276 spin_lock(&inode->i_lock);
277 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
278 spin_unlock(&inode->i_lock);
279 }
280 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
281
nfs_invalidate_atime(struct inode * inode)282 void nfs_invalidate_atime(struct inode *inode)
283 {
284 if (nfs_have_delegated_atime(inode))
285 return;
286 spin_lock(&inode->i_lock);
287 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
288 spin_unlock(&inode->i_lock);
289 }
290 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
291
292 /*
293 * Invalidate, but do not unhash, the inode.
294 * NB: must be called with inode->i_lock held!
295 */
nfs_set_inode_stale_locked(struct inode * inode)296 static void nfs_set_inode_stale_locked(struct inode *inode)
297 {
298 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
299 nfs_zap_caches_locked(inode);
300 trace_nfs_set_inode_stale(inode);
301 }
302
nfs_set_inode_stale(struct inode * inode)303 void nfs_set_inode_stale(struct inode *inode)
304 {
305 spin_lock(&inode->i_lock);
306 nfs_set_inode_stale_locked(inode);
307 spin_unlock(&inode->i_lock);
308 }
309
310 struct nfs_find_desc {
311 struct nfs_fh *fh;
312 struct nfs_fattr *fattr;
313 };
314
315 /*
316 * In NFSv3 we can have 64bit inode numbers. In order to support
317 * this, and re-exported directories (also seen in NFSv2)
318 * we are forced to allow 2 different inodes to have the same
319 * i_ino.
320 */
321 static int
nfs_find_actor(struct inode * inode,void * opaque)322 nfs_find_actor(struct inode *inode, void *opaque)
323 {
324 struct nfs_find_desc *desc = opaque;
325 struct nfs_fh *fh = desc->fh;
326 struct nfs_fattr *fattr = desc->fattr;
327
328 if (NFS_FILEID(inode) != fattr->fileid)
329 return 0;
330 if (inode_wrong_type(inode, fattr->mode))
331 return 0;
332 if (nfs_compare_fh(NFS_FH(inode), fh))
333 return 0;
334 if (is_bad_inode(inode) || NFS_STALE(inode))
335 return 0;
336 return 1;
337 }
338
339 static int
nfs_init_locked(struct inode * inode,void * opaque)340 nfs_init_locked(struct inode *inode, void *opaque)
341 {
342 struct nfs_find_desc *desc = opaque;
343 struct nfs_fattr *fattr = desc->fattr;
344
345 set_nfs_fileid(inode, fattr->fileid);
346 inode->i_mode = fattr->mode;
347 nfs_copy_fh(NFS_FH(inode), desc->fh);
348 return 0;
349 }
350
351 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)352 static void nfs_clear_label_invalid(struct inode *inode)
353 {
354 spin_lock(&inode->i_lock);
355 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
356 spin_unlock(&inode->i_lock);
357 }
358
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)359 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
360 {
361 int error;
362
363 if (fattr->label == NULL)
364 return;
365
366 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
367 error = security_inode_notifysecctx(inode, fattr->label->label,
368 fattr->label->len);
369 if (error)
370 printk(KERN_ERR "%s() %s %d "
371 "security_inode_notifysecctx() %d\n",
372 __func__,
373 (char *)fattr->label->label,
374 fattr->label->len, error);
375 nfs_clear_label_invalid(inode);
376 }
377 }
378
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)379 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
380 {
381 struct nfs4_label *label;
382
383 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
384 return NULL;
385
386 label = kzalloc(sizeof(struct nfs4_label), flags);
387 if (label == NULL)
388 return ERR_PTR(-ENOMEM);
389
390 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
391 if (label->label == NULL) {
392 kfree(label);
393 return ERR_PTR(-ENOMEM);
394 }
395 label->len = NFS4_MAXLABELLEN;
396
397 return label;
398 }
399 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
400 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)401 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
402 {
403 }
404 #endif
405 EXPORT_SYMBOL_GPL(nfs_setsecurity);
406
407 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
408 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)409 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
410 {
411 struct nfs_find_desc desc = {
412 .fh = fh,
413 .fattr = fattr,
414 };
415 struct inode *inode;
416 unsigned long hash;
417
418 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
419 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
420 return NULL;
421
422 hash = nfs_fattr_to_ino_t(fattr);
423 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
424
425 dprintk("%s: returning %p\n", __func__, inode);
426 return inode;
427 }
428
nfs_inode_init_regular(struct nfs_inode * nfsi)429 static void nfs_inode_init_regular(struct nfs_inode *nfsi)
430 {
431 atomic_long_set(&nfsi->nrequests, 0);
432 atomic_long_set(&nfsi->redirtied_pages, 0);
433 INIT_LIST_HEAD(&nfsi->commit_info.list);
434 atomic_long_set(&nfsi->commit_info.ncommit, 0);
435 atomic_set(&nfsi->commit_info.rpcs_out, 0);
436 mutex_init(&nfsi->commit_mutex);
437 }
438
nfs_inode_init_dir(struct nfs_inode * nfsi)439 static void nfs_inode_init_dir(struct nfs_inode *nfsi)
440 {
441 nfsi->cache_change_attribute = 0;
442 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
443 init_rwsem(&nfsi->rmdir_sem);
444 }
445
446 /*
447 * This is our front-end to iget that looks up inodes by file handle
448 * instead of inode number.
449 */
450 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr)451 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
452 {
453 struct nfs_find_desc desc = {
454 .fh = fh,
455 .fattr = fattr
456 };
457 struct inode *inode = ERR_PTR(-ENOENT);
458 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
459 unsigned long hash;
460
461 nfs_attr_check_mountpoint(sb, fattr);
462
463 if (nfs_attr_use_mounted_on_fileid(fattr))
464 fattr->fileid = fattr->mounted_on_fileid;
465 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
466 goto out_no_inode;
467 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
468 goto out_no_inode;
469
470 hash = nfs_fattr_to_ino_t(fattr);
471
472 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
473 if (inode == NULL) {
474 inode = ERR_PTR(-ENOMEM);
475 goto out_no_inode;
476 }
477
478 if (inode->i_state & I_NEW) {
479 struct nfs_inode *nfsi = NFS_I(inode);
480 unsigned long now = jiffies;
481
482 /* We set i_ino for the few things that still rely on it,
483 * such as stat(2) */
484 inode->i_ino = hash;
485
486 /* We can't support update_atime(), since the server will reset it */
487 inode->i_flags |= S_NOATIME|S_NOCMTIME;
488 inode->i_mode = fattr->mode;
489 nfsi->cache_validity = 0;
490 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
491 && (fattr_supported & NFS_ATTR_FATTR_MODE))
492 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
493 /* Why so? Because we want revalidate for devices/FIFOs, and
494 * that's precisely what we have in nfs_file_inode_operations.
495 */
496 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
497 if (S_ISREG(inode->i_mode)) {
498 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
499 inode->i_data.a_ops = &nfs_file_aops;
500 nfs_inode_init_regular(nfsi);
501 mapping_set_large_folios(inode->i_mapping);
502 } else if (S_ISDIR(inode->i_mode)) {
503 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
504 inode->i_fop = &nfs_dir_operations;
505 inode->i_data.a_ops = &nfs_dir_aops;
506 nfs_inode_init_dir(nfsi);
507 /* Deal with crossing mountpoints */
508 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
509 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
510 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
511 inode->i_op = &nfs_referral_inode_operations;
512 else
513 inode->i_op = &nfs_mountpoint_inode_operations;
514 inode->i_fop = NULL;
515 inode->i_flags |= S_AUTOMOUNT;
516 }
517 } else if (S_ISLNK(inode->i_mode)) {
518 inode->i_op = &nfs_symlink_inode_operations;
519 inode_nohighmem(inode);
520 } else
521 init_special_inode(inode, inode->i_mode, fattr->rdev);
522
523 inode_set_atime(inode, 0, 0);
524 inode_set_mtime(inode, 0, 0);
525 inode_set_ctime(inode, 0, 0);
526 memset(&nfsi->btime, 0, sizeof(nfsi->btime));
527 inode_set_iversion_raw(inode, 0);
528 inode->i_size = 0;
529 clear_nlink(inode);
530 inode->i_uid = make_kuid(&init_user_ns, -2);
531 inode->i_gid = make_kgid(&init_user_ns, -2);
532 inode->i_blocks = 0;
533 nfsi->write_io = 0;
534 nfsi->read_io = 0;
535
536 nfsi->read_cache_jiffies = fattr->time_start;
537 nfsi->attr_gencount = fattr->gencount;
538 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
539 inode_set_atime_to_ts(inode, fattr->atime);
540 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
542 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
543 inode_set_mtime_to_ts(inode, fattr->mtime);
544 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
546 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
547 inode_set_ctime_to_ts(inode, fattr->ctime);
548 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
550 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
551 nfsi->btime = fattr->btime;
552 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
553 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BTIME);
554 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
555 inode_set_iversion_raw(inode, fattr->change_attr);
556 else
557 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
558 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
559 inode->i_size = nfs_size_to_loff_t(fattr->size);
560 else
561 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
562 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
563 set_nlink(inode, fattr->nlink);
564 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
565 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
566 else
567 set_nlink(inode, 1);
568 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
569 inode->i_uid = fattr->uid;
570 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
571 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
572 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
573 inode->i_gid = fattr->gid;
574 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
575 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
576 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
577 inode->i_blocks = fattr->du.nfs2.blocks;
578 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
579 fattr->size != 0)
580 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
581 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
582 /*
583 * report the blocks in 512byte units
584 */
585 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
586 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
587 fattr->size != 0)
588 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
589
590 nfs_setsecurity(inode, fattr);
591
592 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
593 nfsi->attrtimeo_timestamp = now;
594 nfsi->access_cache = RB_ROOT;
595
596 nfs_fscache_init_inode(inode);
597
598 unlock_new_inode(inode);
599 } else {
600 int err = nfs_refresh_inode(inode, fattr);
601 if (err < 0) {
602 iput(inode);
603 inode = ERR_PTR(err);
604 goto out_no_inode;
605 }
606 }
607 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
608 inode->i_sb->s_id,
609 (unsigned long long)NFS_FILEID(inode),
610 nfs_display_fhandle_hash(fh),
611 atomic_read(&inode->i_count));
612
613 out:
614 return inode;
615
616 out_no_inode:
617 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
618 goto out;
619 }
620 EXPORT_SYMBOL_GPL(nfs_fhget);
621
622 static void
nfs_fattr_fixup_delegated(struct inode * inode,struct nfs_fattr * fattr)623 nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr)
624 {
625 unsigned long cache_validity = NFS_I(inode)->cache_validity;
626
627 if (nfs_have_delegated_mtime(inode)) {
628 if (!(cache_validity & NFS_INO_INVALID_CTIME))
629 fattr->valid &= ~(NFS_ATTR_FATTR_PRECTIME |
630 NFS_ATTR_FATTR_CTIME);
631
632 if (!(cache_validity & NFS_INO_INVALID_MTIME))
633 fattr->valid &= ~(NFS_ATTR_FATTR_PREMTIME |
634 NFS_ATTR_FATTR_MTIME);
635
636 if (!(cache_validity & NFS_INO_INVALID_ATIME))
637 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
638 } else if (nfs_have_delegated_atime(inode)) {
639 if (!(cache_validity & NFS_INO_INVALID_ATIME))
640 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
641 }
642 }
643
nfs_set_timestamps_to_ts(struct inode * inode,struct iattr * attr)644 static void nfs_set_timestamps_to_ts(struct inode *inode, struct iattr *attr)
645 {
646 unsigned int cache_flags = 0;
647
648 if (attr->ia_valid & ATTR_MTIME_SET) {
649 struct timespec64 ctime = inode_get_ctime(inode);
650 struct timespec64 mtime = inode_get_mtime(inode);
651 struct timespec64 now;
652 int updated = 0;
653
654 now = inode_set_ctime_current(inode);
655 if (!timespec64_equal(&now, &ctime))
656 updated |= S_CTIME;
657
658 inode_set_mtime_to_ts(inode, attr->ia_mtime);
659 if (!timespec64_equal(&now, &mtime))
660 updated |= S_MTIME;
661
662 inode_maybe_inc_iversion(inode, updated);
663 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
664 }
665 if (attr->ia_valid & ATTR_ATIME_SET) {
666 inode_set_atime_to_ts(inode, attr->ia_atime);
667 cache_flags |= NFS_INO_INVALID_ATIME;
668 }
669 NFS_I(inode)->cache_validity &= ~cache_flags;
670 }
671
nfs_update_timestamps(struct inode * inode,unsigned int ia_valid)672 static void nfs_update_timestamps(struct inode *inode, unsigned int ia_valid)
673 {
674 enum file_time_flags time_flags = 0;
675 unsigned int cache_flags = 0;
676
677 if (ia_valid & ATTR_MTIME) {
678 time_flags |= S_MTIME | S_CTIME;
679 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
680 }
681 if (ia_valid & ATTR_ATIME) {
682 time_flags |= S_ATIME;
683 cache_flags |= NFS_INO_INVALID_ATIME;
684 }
685 inode_update_timestamps(inode, time_flags);
686 NFS_I(inode)->cache_validity &= ~cache_flags;
687 }
688
nfs_update_delegated_atime(struct inode * inode)689 void nfs_update_delegated_atime(struct inode *inode)
690 {
691 spin_lock(&inode->i_lock);
692 if (nfs_have_delegated_atime(inode))
693 nfs_update_timestamps(inode, ATTR_ATIME);
694 spin_unlock(&inode->i_lock);
695 }
696
nfs_update_delegated_mtime_locked(struct inode * inode)697 void nfs_update_delegated_mtime_locked(struct inode *inode)
698 {
699 if (nfs_have_delegated_mtime(inode))
700 nfs_update_timestamps(inode, ATTR_MTIME);
701 }
702
nfs_update_delegated_mtime(struct inode * inode)703 void nfs_update_delegated_mtime(struct inode *inode)
704 {
705 spin_lock(&inode->i_lock);
706 nfs_update_delegated_mtime_locked(inode);
707 spin_unlock(&inode->i_lock);
708 }
709 EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime);
710
711 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
712
713 int
nfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)714 nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
715 struct iattr *attr)
716 {
717 struct inode *inode = d_inode(dentry);
718 struct nfs_fattr *fattr;
719 int error = 0;
720
721 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
722
723 /* skip mode change if it's just for clearing setuid/setgid */
724 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
725 attr->ia_valid &= ~ATTR_MODE;
726
727 if (attr->ia_valid & ATTR_SIZE) {
728 BUG_ON(!S_ISREG(inode->i_mode));
729
730 error = inode_newsize_ok(inode, attr->ia_size);
731 if (error)
732 return error;
733
734 if (attr->ia_size == i_size_read(inode))
735 attr->ia_valid &= ~ATTR_SIZE;
736 }
737
738 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
739 spin_lock(&inode->i_lock);
740 if (attr->ia_valid & ATTR_MTIME_SET) {
741 nfs_set_timestamps_to_ts(inode, attr);
742 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET|
743 ATTR_ATIME|ATTR_ATIME_SET);
744 } else {
745 nfs_update_timestamps(inode, attr->ia_valid);
746 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME);
747 }
748 spin_unlock(&inode->i_lock);
749 } else if (nfs_have_delegated_atime(inode) &&
750 attr->ia_valid & ATTR_ATIME &&
751 !(attr->ia_valid & ATTR_MTIME)) {
752 if (attr->ia_valid & ATTR_ATIME_SET) {
753 spin_lock(&inode->i_lock);
754 nfs_set_timestamps_to_ts(inode, attr);
755 spin_unlock(&inode->i_lock);
756 attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
757 } else {
758 nfs_update_delegated_atime(inode);
759 attr->ia_valid &= ~ATTR_ATIME;
760 }
761 }
762
763 /* Optimization: if the end result is no change, don't RPC */
764 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
765 return 0;
766
767 trace_nfs_setattr_enter(inode);
768
769 /* Write all dirty data */
770 if (S_ISREG(inode->i_mode))
771 nfs_sync_inode(inode);
772
773 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
774 if (fattr == NULL) {
775 error = -ENOMEM;
776 goto out;
777 }
778
779 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
780 if (error == 0)
781 error = nfs_refresh_inode(inode, fattr);
782 nfs_free_fattr(fattr);
783 out:
784 trace_nfs_setattr_exit(inode, error);
785 return error;
786 }
787 EXPORT_SYMBOL_GPL(nfs_setattr);
788
789 /**
790 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
791 * @inode: inode of the file used
792 * @offset: file offset to start truncating
793 *
794 * This is a copy of the common vmtruncate, but with the locking
795 * corrected to take into account the fact that NFS requires
796 * inode->i_size to be updated under the inode->i_lock.
797 * Note: must be called with inode->i_lock held!
798 */
nfs_vmtruncate(struct inode * inode,loff_t offset)799 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
800 {
801 int err;
802
803 err = inode_newsize_ok(inode, offset);
804 if (err)
805 goto out;
806
807 trace_nfs_size_truncate(inode, offset);
808 i_size_write(inode, offset);
809 /* Optimisation */
810 if (offset == 0) {
811 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
812 nfs_ooo_clear(NFS_I(inode));
813 }
814 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
815
816 spin_unlock(&inode->i_lock);
817 truncate_pagecache(inode, offset);
818 nfs_update_delegated_mtime_locked(inode);
819 spin_lock(&inode->i_lock);
820 out:
821 return err;
822 }
823
824 /**
825 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
826 * @inode: pointer to struct inode
827 * @attr: pointer to struct iattr
828 * @fattr: pointer to struct nfs_fattr
829 *
830 * Note: we do this in the *proc.c in order to ensure that
831 * it works for things like exclusive creates too.
832 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)833 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
834 struct nfs_fattr *fattr)
835 {
836 /* Barrier: bump the attribute generation count. */
837 nfs_fattr_set_barrier(fattr);
838
839 spin_lock(&inode->i_lock);
840 NFS_I(inode)->attr_gencount = fattr->gencount;
841 if ((attr->ia_valid & ATTR_SIZE) != 0) {
842 if (!nfs_have_delegated_mtime(inode))
843 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
844 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
845 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
846 nfs_vmtruncate(inode, attr->ia_size);
847 }
848 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
849 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
850 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
851 inode->i_mode & S_ISUID)
852 inode->i_mode &= ~S_ISUID;
853 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
854 inode->i_mode &= ~S_ISGID;
855 if ((attr->ia_valid & ATTR_MODE) != 0) {
856 int mode = attr->ia_mode & S_IALLUGO;
857 mode |= inode->i_mode & ~S_IALLUGO;
858 inode->i_mode = mode;
859 }
860 if ((attr->ia_valid & ATTR_UID) != 0)
861 inode->i_uid = attr->ia_uid;
862 if ((attr->ia_valid & ATTR_GID) != 0)
863 inode->i_gid = attr->ia_gid;
864 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
865 inode_set_ctime_to_ts(inode, fattr->ctime);
866 else
867 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
868 | NFS_INO_INVALID_CTIME);
869 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
870 | NFS_INO_INVALID_ACL);
871 }
872 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
873 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
874 | NFS_INO_INVALID_CTIME);
875 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
876 inode_set_atime_to_ts(inode, fattr->atime);
877 else if (attr->ia_valid & ATTR_ATIME_SET)
878 inode_set_atime_to_ts(inode, attr->ia_atime);
879 else
880 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
881
882 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
883 inode_set_ctime_to_ts(inode, fattr->ctime);
884 else
885 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
886 | NFS_INO_INVALID_CTIME);
887 }
888 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
889 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
890 | NFS_INO_INVALID_CTIME);
891 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
892 inode_set_mtime_to_ts(inode, fattr->mtime);
893 else if (attr->ia_valid & ATTR_MTIME_SET)
894 inode_set_mtime_to_ts(inode, attr->ia_mtime);
895 else
896 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
897
898 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
899 inode_set_ctime_to_ts(inode, fattr->ctime);
900 else
901 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
902 | NFS_INO_INVALID_CTIME);
903 }
904 if (fattr->valid)
905 nfs_update_inode(inode, fattr);
906 spin_unlock(&inode->i_lock);
907 }
908 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
909
910 /*
911 * Don't request help from readdirplus if the file is being written to,
912 * or if attribute caching is turned off
913 */
nfs_getattr_readdirplus_enable(const struct inode * inode)914 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
915 {
916 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
917 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
918 }
919
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)920 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
921 {
922 if (!IS_ROOT(dentry)) {
923 struct dentry *parent = dget_parent(dentry);
924 nfs_readdir_record_entry_cache_miss(d_inode(parent));
925 dput(parent);
926 }
927 }
928
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)929 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
930 {
931 if (!IS_ROOT(dentry)) {
932 struct dentry *parent = dget_parent(dentry);
933 nfs_readdir_record_entry_cache_hit(d_inode(parent));
934 dput(parent);
935 }
936 }
937
nfs_get_valid_attrmask(struct inode * inode)938 static u32 nfs_get_valid_attrmask(struct inode *inode)
939 {
940 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid;
941 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
942 u32 reply_mask = STATX_INO | STATX_TYPE;
943
944 if (!(cache_validity & NFS_INO_INVALID_ATIME))
945 reply_mask |= STATX_ATIME;
946 if (!(cache_validity & NFS_INO_INVALID_CTIME))
947 reply_mask |= STATX_CTIME;
948 if (!(cache_validity & NFS_INO_INVALID_MTIME))
949 reply_mask |= STATX_MTIME;
950 if (!(cache_validity & NFS_INO_INVALID_SIZE))
951 reply_mask |= STATX_SIZE;
952 if (!(cache_validity & NFS_INO_INVALID_NLINK))
953 reply_mask |= STATX_NLINK;
954 if (!(cache_validity & NFS_INO_INVALID_MODE))
955 reply_mask |= STATX_MODE;
956 if (!(cache_validity & NFS_INO_INVALID_OTHER))
957 reply_mask |= STATX_UID | STATX_GID;
958 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
959 reply_mask |= STATX_BLOCKS;
960 if (!(cache_validity & NFS_INO_INVALID_BTIME) &&
961 (fattr_valid & NFS_ATTR_FATTR_BTIME))
962 reply_mask |= STATX_BTIME;
963 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
964 reply_mask |= STATX_CHANGE_COOKIE;
965 return reply_mask;
966 }
967
nfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)968 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
969 struct kstat *stat, u32 request_mask, unsigned int query_flags)
970 {
971 struct inode *inode = d_inode(path->dentry);
972 struct nfs_server *server = NFS_SERVER(inode);
973 u64 fattr_valid = server->fattr_valid;
974 unsigned long cache_validity;
975 int err = 0;
976 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
977 bool do_update = false;
978 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
979
980 trace_nfs_getattr_enter(inode);
981
982 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
983 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
984 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME |
985 STATX_CHANGE_COOKIE;
986
987 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME))
988 request_mask &= ~STATX_BTIME;
989
990 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
991 if (readdirplus_enabled)
992 nfs_readdirplus_parent_cache_hit(path->dentry);
993 goto out_no_revalidate;
994 }
995
996 /* Flush out writes to the server in order to update c/mtime/version. */
997 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
998 S_ISREG(inode->i_mode)) {
999 if (nfs_have_delegated_mtime(inode))
1000 filemap_fdatawrite(inode->i_mapping);
1001 else
1002 filemap_write_and_wait(inode->i_mapping);
1003 }
1004
1005 /*
1006 * We may force a getattr if the user cares about atime.
1007 *
1008 * Note that we only have to check the vfsmount flags here:
1009 * - NFS always sets S_NOATIME by so checking it would give a
1010 * bogus result
1011 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
1012 * no point in checking those.
1013 */
1014 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
1015 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1016 request_mask &= ~STATX_ATIME;
1017
1018 /* Is the user requesting attributes that might need revalidation? */
1019 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
1020 STATX_MTIME|STATX_UID|STATX_GID|
1021 STATX_SIZE|STATX_BLOCKS|STATX_BTIME|
1022 STATX_CHANGE_COOKIE)))
1023 goto out_no_revalidate;
1024
1025 /* Check whether the cached attributes are stale */
1026 do_update |= force_sync || nfs_attribute_cache_expired(inode);
1027 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
1028 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
1029 if (request_mask & STATX_ATIME)
1030 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
1031 if (request_mask & STATX_CTIME)
1032 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
1033 if (request_mask & STATX_MTIME)
1034 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
1035 if (request_mask & STATX_SIZE)
1036 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
1037 if (request_mask & STATX_NLINK)
1038 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
1039 if (request_mask & STATX_MODE)
1040 do_update |= cache_validity & NFS_INO_INVALID_MODE;
1041 if (request_mask & (STATX_UID | STATX_GID))
1042 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
1043 if (request_mask & STATX_BLOCKS)
1044 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
1045 if (request_mask & STATX_BTIME)
1046 do_update |= cache_validity & NFS_INO_INVALID_BTIME;
1047
1048 if (do_update) {
1049 if (readdirplus_enabled)
1050 nfs_readdirplus_parent_cache_miss(path->dentry);
1051 err = __nfs_revalidate_inode(server, inode);
1052 if (err)
1053 goto out;
1054 } else if (readdirplus_enabled)
1055 nfs_readdirplus_parent_cache_hit(path->dentry);
1056 out_no_revalidate:
1057 /* Only return attributes that were revalidated. */
1058 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
1059
1060 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1061 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
1062 stat->change_cookie = inode_peek_iversion_raw(inode);
1063 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
1064 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
1065 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
1066 if (S_ISDIR(inode->i_mode))
1067 stat->blksize = NFS_SERVER(inode)->dtsize;
1068 stat->btime = NFS_I(inode)->btime;
1069 out:
1070 trace_nfs_getattr_exit(inode, err);
1071 return err;
1072 }
1073 EXPORT_SYMBOL_GPL(nfs_getattr);
1074
nfs_init_lock_context(struct nfs_lock_context * l_ctx)1075 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
1076 {
1077 refcount_set(&l_ctx->count, 1);
1078 l_ctx->lockowner = current->files;
1079 INIT_LIST_HEAD(&l_ctx->list);
1080 atomic_set(&l_ctx->io_count, 0);
1081 }
1082
__nfs_find_lock_context(struct nfs_open_context * ctx)1083 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
1084 {
1085 struct nfs_lock_context *pos;
1086
1087 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
1088 if (pos->lockowner != current->files)
1089 continue;
1090 if (refcount_inc_not_zero(&pos->count))
1091 return pos;
1092 }
1093 return NULL;
1094 }
1095
nfs_get_lock_context(struct nfs_open_context * ctx)1096 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
1097 {
1098 struct nfs_lock_context *res, *new = NULL;
1099 struct inode *inode = d_inode(ctx->dentry);
1100
1101 rcu_read_lock();
1102 res = __nfs_find_lock_context(ctx);
1103 rcu_read_unlock();
1104 if (res == NULL) {
1105 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
1106 if (new == NULL)
1107 return ERR_PTR(-ENOMEM);
1108 nfs_init_lock_context(new);
1109 spin_lock(&inode->i_lock);
1110 res = __nfs_find_lock_context(ctx);
1111 if (res == NULL) {
1112 new->open_context = get_nfs_open_context(ctx);
1113 if (new->open_context) {
1114 list_add_tail_rcu(&new->list,
1115 &ctx->lock_context.list);
1116 res = new;
1117 new = NULL;
1118 } else
1119 res = ERR_PTR(-EBADF);
1120 }
1121 spin_unlock(&inode->i_lock);
1122 kfree(new);
1123 }
1124 return res;
1125 }
1126 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
1127
nfs_put_lock_context(struct nfs_lock_context * l_ctx)1128 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
1129 {
1130 struct nfs_open_context *ctx = l_ctx->open_context;
1131 struct inode *inode = d_inode(ctx->dentry);
1132
1133 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
1134 return;
1135 list_del_rcu(&l_ctx->list);
1136 spin_unlock(&inode->i_lock);
1137 put_nfs_open_context(ctx);
1138 kfree_rcu(l_ctx, rcu_head);
1139 }
1140 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
1141
1142 /**
1143 * nfs_close_context - Common close_context() routine NFSv2/v3
1144 * @ctx: pointer to context
1145 * @is_sync: is this a synchronous close
1146 *
1147 * Ensure that the attributes are up to date if we're mounted
1148 * with close-to-open semantics and we have cached data that will
1149 * need to be revalidated on open.
1150 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1151 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1152 {
1153 struct nfs_inode *nfsi;
1154 struct inode *inode;
1155
1156 if (!(ctx->mode & FMODE_WRITE))
1157 return;
1158 if (!is_sync)
1159 return;
1160 inode = d_inode(ctx->dentry);
1161 if (nfs_have_read_or_write_delegation(inode))
1162 return;
1163 nfsi = NFS_I(inode);
1164 if (inode->i_mapping->nrpages == 0)
1165 return;
1166 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1167 return;
1168 if (!list_empty(&nfsi->open_files))
1169 return;
1170 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1171 return;
1172 nfs_revalidate_inode(inode,
1173 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1174 }
1175 EXPORT_SYMBOL_GPL(nfs_close_context);
1176
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1177 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1178 fmode_t f_mode,
1179 struct file *filp)
1180 {
1181 struct nfs_open_context *ctx;
1182
1183 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1184 if (!ctx)
1185 return ERR_PTR(-ENOMEM);
1186 nfs_sb_active(dentry->d_sb);
1187 ctx->dentry = dget(dentry);
1188 if (filp)
1189 ctx->cred = get_cred(filp->f_cred);
1190 else
1191 ctx->cred = get_current_cred();
1192 rcu_assign_pointer(ctx->ll_cred, NULL);
1193 ctx->state = NULL;
1194 ctx->mode = f_mode;
1195 ctx->flags = 0;
1196 ctx->error = 0;
1197 ctx->flock_owner = (fl_owner_t)filp;
1198 nfs_init_lock_context(&ctx->lock_context);
1199 ctx->lock_context.open_context = ctx;
1200 INIT_LIST_HEAD(&ctx->list);
1201 ctx->mdsthreshold = NULL;
1202 nfs_localio_file_init(&ctx->nfl);
1203
1204 return ctx;
1205 }
1206 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1207
get_nfs_open_context(struct nfs_open_context * ctx)1208 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1209 {
1210 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1211 return ctx;
1212 return NULL;
1213 }
1214 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1215
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1216 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1217 {
1218 struct inode *inode = d_inode(ctx->dentry);
1219 struct super_block *sb = ctx->dentry->d_sb;
1220
1221 if (!refcount_dec_and_test(&ctx->lock_context.count))
1222 return;
1223 if (!list_empty(&ctx->list)) {
1224 spin_lock(&inode->i_lock);
1225 list_del_rcu(&ctx->list);
1226 spin_unlock(&inode->i_lock);
1227 }
1228 if (inode != NULL)
1229 NFS_PROTO(inode)->close_context(ctx, is_sync);
1230 put_cred(ctx->cred);
1231 dput(ctx->dentry);
1232 nfs_sb_deactive(sb);
1233 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1234 kfree(ctx->mdsthreshold);
1235 nfs_close_local_fh(&ctx->nfl);
1236 kfree_rcu(ctx, rcu_head);
1237 }
1238
put_nfs_open_context(struct nfs_open_context * ctx)1239 void put_nfs_open_context(struct nfs_open_context *ctx)
1240 {
1241 __put_nfs_open_context(ctx, 0);
1242 }
1243 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1244
put_nfs_open_context_sync(struct nfs_open_context * ctx)1245 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1246 {
1247 __put_nfs_open_context(ctx, 1);
1248 }
1249
1250 /*
1251 * Ensure that mmap has a recent RPC credential for use when writing out
1252 * shared pages
1253 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1254 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1255 {
1256 struct inode *inode = d_inode(ctx->dentry);
1257 struct nfs_inode *nfsi = NFS_I(inode);
1258
1259 spin_lock(&inode->i_lock);
1260 if (list_empty(&nfsi->open_files) &&
1261 nfs_ooo_test(nfsi))
1262 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1263 NFS_INO_REVAL_FORCED);
1264 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1265 spin_unlock(&inode->i_lock);
1266 }
1267 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1268
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1269 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1270 {
1271 filp->private_data = get_nfs_open_context(ctx);
1272 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1273 if (list_empty(&ctx->list))
1274 nfs_inode_attach_open_context(ctx);
1275 }
1276 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1277
1278 /*
1279 * Given an inode, search for an open context with the desired characteristics
1280 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1281 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1282 {
1283 struct nfs_inode *nfsi = NFS_I(inode);
1284 struct nfs_open_context *pos, *ctx = NULL;
1285
1286 rcu_read_lock();
1287 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1288 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1289 continue;
1290 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1291 continue;
1292 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1293 continue;
1294 ctx = get_nfs_open_context(pos);
1295 if (ctx)
1296 break;
1297 }
1298 rcu_read_unlock();
1299 return ctx;
1300 }
1301
nfs_file_clear_open_context(struct file * filp)1302 void nfs_file_clear_open_context(struct file *filp)
1303 {
1304 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1305
1306 if (ctx) {
1307 struct inode *inode = d_inode(ctx->dentry);
1308
1309 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1310 /*
1311 * We fatal error on write before. Try to writeback
1312 * every page again.
1313 */
1314 if (ctx->error < 0)
1315 invalidate_inode_pages2(inode->i_mapping);
1316 filp->private_data = NULL;
1317 put_nfs_open_context_sync(ctx);
1318 }
1319 }
1320
1321 /*
1322 * These allocate and release file read/write context information.
1323 */
nfs_open(struct inode * inode,struct file * filp)1324 int nfs_open(struct inode *inode, struct file *filp)
1325 {
1326 struct nfs_open_context *ctx;
1327
1328 ctx = alloc_nfs_open_context(file_dentry(filp),
1329 flags_to_mode(filp->f_flags), filp);
1330 if (IS_ERR(ctx))
1331 return PTR_ERR(ctx);
1332 nfs_file_set_open_context(filp, ctx);
1333 put_nfs_open_context(ctx);
1334 nfs_fscache_open_file(inode, filp);
1335 return 0;
1336 }
1337
1338 /*
1339 * This function is called whenever some part of NFS notices that
1340 * the cached attributes have to be refreshed.
1341 */
1342 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1343 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1344 {
1345 int status = -ESTALE;
1346 struct nfs_fattr *fattr = NULL;
1347 struct nfs_inode *nfsi = NFS_I(inode);
1348
1349 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1350 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1351
1352 trace_nfs_revalidate_inode_enter(inode);
1353
1354 if (is_bad_inode(inode))
1355 goto out;
1356 if (NFS_STALE(inode))
1357 goto out;
1358
1359 /* pNFS: Attributes aren't updated until we layoutcommit */
1360 if (S_ISREG(inode->i_mode)) {
1361 status = pnfs_sync_inode(inode, false);
1362 if (status)
1363 goto out;
1364 }
1365
1366 status = -ENOMEM;
1367 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1368 if (fattr == NULL)
1369 goto out;
1370
1371 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1372
1373 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1374 if (status != 0) {
1375 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1376 inode->i_sb->s_id,
1377 (unsigned long long)NFS_FILEID(inode), status);
1378 switch (status) {
1379 case -ETIMEDOUT:
1380 /* A soft timeout occurred. Use cached information? */
1381 if (server->flags & NFS_MOUNT_SOFTREVAL)
1382 status = 0;
1383 break;
1384 case -ESTALE:
1385 if (!S_ISDIR(inode->i_mode))
1386 nfs_set_inode_stale(inode);
1387 else
1388 nfs_zap_caches(inode);
1389 }
1390 goto out;
1391 }
1392
1393 status = nfs_refresh_inode(inode, fattr);
1394 if (status) {
1395 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1396 inode->i_sb->s_id,
1397 (unsigned long long)NFS_FILEID(inode), status);
1398 goto out;
1399 }
1400
1401 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1402 nfs_zap_acl_cache(inode);
1403
1404 nfs_setsecurity(inode, fattr);
1405
1406 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1407 inode->i_sb->s_id,
1408 (unsigned long long)NFS_FILEID(inode));
1409
1410 out:
1411 nfs_free_fattr(fattr);
1412 trace_nfs_revalidate_inode_exit(inode, status);
1413 return status;
1414 }
1415
nfs_attribute_cache_expired(struct inode * inode)1416 int nfs_attribute_cache_expired(struct inode *inode)
1417 {
1418 if (nfs_have_delegated_attributes(inode))
1419 return 0;
1420 return nfs_attribute_timeout(inode);
1421 }
1422
1423 /**
1424 * nfs_revalidate_inode - Revalidate the inode attributes
1425 * @inode: pointer to inode struct
1426 * @flags: cache flags to check
1427 *
1428 * Updates inode attribute information by retrieving the data from the server.
1429 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1430 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1431 {
1432 if (!nfs_check_cache_invalid(inode, flags))
1433 return NFS_STALE(inode) ? -ESTALE : 0;
1434 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1435 }
1436 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1437
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1438 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1439 {
1440 int ret;
1441
1442 nfs_fscache_invalidate(inode, 0);
1443 if (mapping->nrpages != 0) {
1444 if (S_ISREG(inode->i_mode)) {
1445 ret = nfs_sync_mapping(mapping);
1446 if (ret < 0)
1447 return ret;
1448 }
1449 ret = invalidate_inode_pages2(mapping);
1450 if (ret < 0)
1451 return ret;
1452 }
1453 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1454
1455 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1456 inode->i_sb->s_id,
1457 (unsigned long long)NFS_FILEID(inode));
1458 return 0;
1459 }
1460
1461 /**
1462 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1463 * @mapping: pointer to mapping
1464 *
1465 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1466 */
nfs_clear_invalid_mapping(struct address_space * mapping)1467 int nfs_clear_invalid_mapping(struct address_space *mapping)
1468 {
1469 struct inode *inode = mapping->host;
1470 struct nfs_inode *nfsi = NFS_I(inode);
1471 unsigned long *bitlock = &nfsi->flags;
1472 int ret = 0;
1473
1474 /*
1475 * We must clear NFS_INO_INVALID_DATA first to ensure that
1476 * invalidations that come in while we're shooting down the mappings
1477 * are respected. But, that leaves a race window where one revalidator
1478 * can clear the flag, and then another checks it before the mapping
1479 * gets invalidated. Fix that by serializing access to this part of
1480 * the function.
1481 *
1482 * At the same time, we need to allow other tasks to see whether we
1483 * might be in the middle of invalidating the pages, so we only set
1484 * the bit lock here if it looks like we're going to be doing that.
1485 */
1486 for (;;) {
1487 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1488 nfs_wait_bit_killable,
1489 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1490 if (ret)
1491 goto out;
1492 smp_rmb(); /* pairs with smp_wmb() below */
1493 if (test_bit(NFS_INO_INVALIDATING, bitlock))
1494 continue;
1495 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */
1496 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA))
1497 goto out;
1498 /* Slow-path that double-checks with spinlock held */
1499 spin_lock(&inode->i_lock);
1500 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1501 spin_unlock(&inode->i_lock);
1502 continue;
1503 }
1504 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1505 break;
1506 spin_unlock(&inode->i_lock);
1507 goto out;
1508 }
1509
1510 set_bit(NFS_INO_INVALIDATING, bitlock);
1511 smp_wmb();
1512 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1513 nfs_ooo_clear(nfsi);
1514 spin_unlock(&inode->i_lock);
1515 trace_nfs_invalidate_mapping_enter(inode);
1516 ret = nfs_invalidate_mapping(inode, mapping);
1517 trace_nfs_invalidate_mapping_exit(inode, ret);
1518
1519 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1520 smp_mb__after_atomic();
1521 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1522 out:
1523 return ret;
1524 }
1525
nfs_mapping_need_revalidate_inode(struct inode * inode)1526 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1527 {
1528 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1529 NFS_STALE(inode);
1530 }
1531
nfs_revalidate_mapping_rcu(struct inode * inode)1532 int nfs_revalidate_mapping_rcu(struct inode *inode)
1533 {
1534 struct nfs_inode *nfsi = NFS_I(inode);
1535 unsigned long *bitlock = &nfsi->flags;
1536 int ret = 0;
1537
1538 if (IS_SWAPFILE(inode))
1539 goto out;
1540 if (nfs_mapping_need_revalidate_inode(inode)) {
1541 ret = -ECHILD;
1542 goto out;
1543 }
1544 spin_lock(&inode->i_lock);
1545 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1546 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1547 ret = -ECHILD;
1548 spin_unlock(&inode->i_lock);
1549 out:
1550 return ret;
1551 }
1552
1553 /**
1554 * nfs_revalidate_mapping - Revalidate the pagecache
1555 * @inode: pointer to host inode
1556 * @mapping: pointer to mapping
1557 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1558 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1559 {
1560 /* swapfiles are not supposed to be shared. */
1561 if (IS_SWAPFILE(inode))
1562 return 0;
1563
1564 if (nfs_mapping_need_revalidate_inode(inode)) {
1565 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1566 if (ret < 0)
1567 return ret;
1568 }
1569
1570 return nfs_clear_invalid_mapping(mapping);
1571 }
1572
nfs_file_has_writers(struct nfs_inode * nfsi)1573 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1574 {
1575 struct inode *inode = &nfsi->vfs_inode;
1576
1577 if (!S_ISREG(inode->i_mode))
1578 return false;
1579 if (list_empty(&nfsi->open_files))
1580 return false;
1581 return inode_is_open_for_write(inode);
1582 }
1583
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1584 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1585 {
1586 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1587 }
1588
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1589 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1590 {
1591 struct timespec64 ts;
1592
1593 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1594 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1595 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1596 inode_set_iversion_raw(inode, fattr->change_attr);
1597 if (S_ISDIR(inode->i_mode))
1598 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1599 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1600 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1601 }
1602 /* If we have atomic WCC data, we may update some attributes */
1603 ts = inode_get_ctime(inode);
1604 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1605 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1606 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1607 inode_set_ctime_to_ts(inode, fattr->ctime);
1608 }
1609
1610 ts = inode_get_mtime(inode);
1611 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1612 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1613 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1614 inode_set_mtime_to_ts(inode, fattr->mtime);
1615 }
1616 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1617 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1618 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1619 && !nfs_have_writebacks(inode)) {
1620 trace_nfs_size_wcc(inode, fattr->size);
1621 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1622 }
1623 }
1624
1625 /**
1626 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1627 * @inode: pointer to inode
1628 * @fattr: updated attributes
1629 *
1630 * Verifies the attribute cache. If we have just changed the attributes,
1631 * so that fattr carries weak cache consistency data, then it may
1632 * also update the ctime/mtime/change_attribute.
1633 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1634 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1635 {
1636 struct nfs_inode *nfsi = NFS_I(inode);
1637 loff_t cur_size, new_isize;
1638 unsigned long invalid = 0;
1639 struct timespec64 ts;
1640
1641 if (nfs_have_delegated_attributes(inode))
1642 return 0;
1643
1644 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1645 /* Only a mounted-on-fileid? Just exit */
1646 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1647 return 0;
1648 /* Has the inode gone and changed behind our back? */
1649 } else if (nfsi->fileid != fattr->fileid) {
1650 /* Is this perhaps the mounted-on fileid? */
1651 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1652 nfsi->fileid == fattr->mounted_on_fileid)
1653 return 0;
1654 return -ESTALE;
1655 }
1656 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1657 return -ESTALE;
1658
1659
1660 if (!nfs_file_has_buffered_writers(nfsi)) {
1661 /* Verify a few of the more important attributes */
1662 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1663 invalid |= NFS_INO_INVALID_CHANGE;
1664
1665 ts = inode_get_mtime(inode);
1666 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1667 invalid |= NFS_INO_INVALID_MTIME;
1668
1669 ts = inode_get_ctime(inode);
1670 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1671 invalid |= NFS_INO_INVALID_CTIME;
1672
1673 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1674 cur_size = i_size_read(inode);
1675 new_isize = nfs_size_to_loff_t(fattr->size);
1676 if (cur_size != new_isize)
1677 invalid |= NFS_INO_INVALID_SIZE;
1678 }
1679 }
1680
1681 /* Have any file permissions changed? */
1682 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1683 invalid |= NFS_INO_INVALID_MODE;
1684 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1685 invalid |= NFS_INO_INVALID_OTHER;
1686 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1687 invalid |= NFS_INO_INVALID_OTHER;
1688
1689 /* Has the link count changed? */
1690 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1691 invalid |= NFS_INO_INVALID_NLINK;
1692
1693 ts = inode_get_atime(inode);
1694 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1695 invalid |= NFS_INO_INVALID_ATIME;
1696
1697 if (invalid != 0)
1698 nfs_set_cache_invalid(inode, invalid);
1699
1700 nfsi->read_cache_jiffies = fattr->time_start;
1701 return 0;
1702 }
1703
1704 static atomic_long_t nfs_attr_generation_counter;
1705
nfs_read_attr_generation_counter(void)1706 static unsigned long nfs_read_attr_generation_counter(void)
1707 {
1708 return atomic_long_read(&nfs_attr_generation_counter);
1709 }
1710
nfs_inc_attr_generation_counter(void)1711 unsigned long nfs_inc_attr_generation_counter(void)
1712 {
1713 return atomic_long_inc_return(&nfs_attr_generation_counter);
1714 }
1715 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1716
nfs_fattr_init(struct nfs_fattr * fattr)1717 void nfs_fattr_init(struct nfs_fattr *fattr)
1718 {
1719 fattr->valid = 0;
1720 fattr->time_start = jiffies;
1721 fattr->gencount = nfs_inc_attr_generation_counter();
1722 fattr->owner_name = NULL;
1723 fattr->group_name = NULL;
1724 fattr->mdsthreshold = NULL;
1725 }
1726 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1727
1728 /**
1729 * nfs_fattr_set_barrier
1730 * @fattr: attributes
1731 *
1732 * Used to set a barrier after an attribute was updated. This
1733 * barrier ensures that older attributes from RPC calls that may
1734 * have raced with our update cannot clobber these new values.
1735 * Note that you are still responsible for ensuring that other
1736 * operations which change the attribute on the server do not
1737 * collide.
1738 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1739 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1740 {
1741 fattr->gencount = nfs_inc_attr_generation_counter();
1742 }
1743
nfs_alloc_fattr(void)1744 struct nfs_fattr *nfs_alloc_fattr(void)
1745 {
1746 struct nfs_fattr *fattr;
1747
1748 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1749 if (fattr != NULL) {
1750 nfs_fattr_init(fattr);
1751 fattr->label = NULL;
1752 }
1753 return fattr;
1754 }
1755 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1756
nfs_alloc_fattr_with_label(struct nfs_server * server)1757 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1758 {
1759 struct nfs_fattr *fattr = nfs_alloc_fattr();
1760
1761 if (!fattr)
1762 return NULL;
1763
1764 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1765 if (IS_ERR(fattr->label)) {
1766 kfree(fattr);
1767 return NULL;
1768 }
1769
1770 return fattr;
1771 }
1772 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1773
nfs_alloc_fhandle(void)1774 struct nfs_fh *nfs_alloc_fhandle(void)
1775 {
1776 struct nfs_fh *fh;
1777
1778 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1779 if (fh != NULL)
1780 fh->size = 0;
1781 return fh;
1782 }
1783 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1784
1785 #ifdef NFS_DEBUG
1786 /*
1787 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1788 * in the same way that wireshark does
1789 *
1790 * @fh: file handle
1791 *
1792 * For debugging only.
1793 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1794 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1795 {
1796 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1797 * not on the result */
1798 return nfs_fhandle_hash(fh);
1799 }
1800 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1801
1802 /*
1803 * _nfs_display_fhandle - display an NFS file handle on the console
1804 *
1805 * @fh: file handle to display
1806 * @caption: display caption
1807 *
1808 * For debugging only.
1809 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1810 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1811 {
1812 unsigned short i;
1813
1814 if (fh == NULL || fh->size == 0) {
1815 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1816 return;
1817 }
1818
1819 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1820 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1821 for (i = 0; i < fh->size; i += 16) {
1822 __be32 *pos = (__be32 *)&fh->data[i];
1823
1824 switch ((fh->size - i - 1) >> 2) {
1825 case 0:
1826 printk(KERN_DEFAULT " %08x\n",
1827 be32_to_cpup(pos));
1828 break;
1829 case 1:
1830 printk(KERN_DEFAULT " %08x %08x\n",
1831 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1832 break;
1833 case 2:
1834 printk(KERN_DEFAULT " %08x %08x %08x\n",
1835 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1836 be32_to_cpup(pos + 2));
1837 break;
1838 default:
1839 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1840 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1841 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1842 }
1843 }
1844 }
1845 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1846 #endif
1847
1848 /**
1849 * nfs_inode_attrs_cmp_generic - compare attributes
1850 * @fattr: attributes
1851 * @inode: pointer to inode
1852 *
1853 * Attempt to divine whether or not an RPC call reply carrying stale
1854 * attributes got scheduled after another call carrying updated ones.
1855 * Note also the check for wraparound of 'attr_gencount'
1856 *
1857 * The function returns '1' if it thinks the attributes in @fattr are
1858 * more recent than the ones cached in @inode. Otherwise it returns
1859 * the value '0'.
1860 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1861 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1862 const struct inode *inode)
1863 {
1864 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1865
1866 return (long)(fattr->gencount - attr_gencount) > 0 ||
1867 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1868 }
1869
1870 /**
1871 * nfs_inode_attrs_cmp_monotonic - compare attributes
1872 * @fattr: attributes
1873 * @inode: pointer to inode
1874 *
1875 * Attempt to divine whether or not an RPC call reply carrying stale
1876 * attributes got scheduled after another call carrying updated ones.
1877 *
1878 * We assume that the server observes monotonic semantics for
1879 * the change attribute, so a larger value means that the attributes in
1880 * @fattr are more recent, in which case the function returns the
1881 * value '1'.
1882 * A return value of '0' indicates no measurable change
1883 * A return value of '-1' means that the attributes in @inode are
1884 * more recent.
1885 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1886 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1887 const struct inode *inode)
1888 {
1889 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1890 if (diff > 0)
1891 return 1;
1892 return diff == 0 ? 0 : -1;
1893 }
1894
1895 /**
1896 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1897 * @fattr: attributes
1898 * @inode: pointer to inode
1899 *
1900 * Attempt to divine whether or not an RPC call reply carrying stale
1901 * attributes got scheduled after another call carrying updated ones.
1902 *
1903 * We assume that the server observes strictly monotonic semantics for
1904 * the change attribute, so a larger value means that the attributes in
1905 * @fattr are more recent, in which case the function returns the
1906 * value '1'.
1907 * A return value of '-1' means that the attributes in @inode are
1908 * more recent or unchanged.
1909 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1910 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1911 const struct inode *inode)
1912 {
1913 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1914 }
1915
1916 /**
1917 * nfs_inode_attrs_cmp - compare attributes
1918 * @fattr: attributes
1919 * @inode: pointer to inode
1920 *
1921 * This function returns '1' if it thinks the attributes in @fattr are
1922 * more recent than the ones cached in @inode. It returns '-1' if
1923 * the attributes in @inode are more recent than the ones in @fattr,
1924 * and it returns 0 if not sure.
1925 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1926 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1927 const struct inode *inode)
1928 {
1929 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1930 return 1;
1931 switch (NFS_SERVER(inode)->change_attr_type) {
1932 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1933 break;
1934 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1935 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1936 break;
1937 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1938 default:
1939 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1940 break;
1941 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1942 }
1943 return 0;
1944 }
1945
1946 /**
1947 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1948 * @fattr: attributes
1949 * @inode: pointer to inode
1950 *
1951 * Returns '1' if the last attribute update left the inode cached
1952 * attributes in a partially unrevalidated state, and @fattr
1953 * matches the change attribute of that partial update.
1954 * Otherwise returns '0'.
1955 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1956 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1957 const struct inode *inode)
1958 {
1959 const unsigned long check_valid =
1960 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1961 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1962 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1963 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME;
1964 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1965 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1966
1967 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1968 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
1969 (cache_validity & check_valid) != 0 &&
1970 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1971 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1972 return 1;
1973 return 0;
1974 }
1975
nfs_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)1976 static void nfs_ooo_merge(struct nfs_inode *nfsi,
1977 u64 start, u64 end)
1978 {
1979 int i, cnt;
1980
1981 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
1982 /* No point merging anything */
1983 return;
1984
1985 if (!nfsi->ooo) {
1986 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
1987 if (!nfsi->ooo) {
1988 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1989 return;
1990 }
1991 nfsi->ooo->cnt = 0;
1992 }
1993
1994 /* add this range, merging if possible */
1995 cnt = nfsi->ooo->cnt;
1996 for (i = 0; i < cnt; i++) {
1997 if (end == nfsi->ooo->gap[i].start)
1998 end = nfsi->ooo->gap[i].end;
1999 else if (start == nfsi->ooo->gap[i].end)
2000 start = nfsi->ooo->gap[i].start;
2001 else
2002 continue;
2003 /* Remove 'i' from table and loop to insert the new range */
2004 cnt -= 1;
2005 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
2006 i = -1;
2007 }
2008 if (start != end) {
2009 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
2010 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2011 kfree(nfsi->ooo);
2012 nfsi->ooo = NULL;
2013 return;
2014 }
2015 nfsi->ooo->gap[cnt].start = start;
2016 nfsi->ooo->gap[cnt].end = end;
2017 cnt += 1;
2018 }
2019 nfsi->ooo->cnt = cnt;
2020 }
2021
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)2022 static void nfs_ooo_record(struct nfs_inode *nfsi,
2023 struct nfs_fattr *fattr)
2024 {
2025 /* This reply was out-of-order, so record in the
2026 * pre/post change id, possibly cancelling
2027 * gaps created when iversion was jumpped forward.
2028 */
2029 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
2030 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
2031 nfs_ooo_merge(nfsi,
2032 fattr->change_attr,
2033 fattr->pre_change_attr);
2034 }
2035
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)2036 static int nfs_refresh_inode_locked(struct inode *inode,
2037 struct nfs_fattr *fattr)
2038 {
2039 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2040 int ret = 0;
2041
2042 trace_nfs_refresh_inode_enter(inode);
2043
2044 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
2045 ret = nfs_update_inode(inode, fattr);
2046 else {
2047 nfs_ooo_record(NFS_I(inode), fattr);
2048
2049 if (attr_cmp == 0)
2050 ret = nfs_check_inode_attributes(inode, fattr);
2051 }
2052
2053 trace_nfs_refresh_inode_exit(inode, ret);
2054 return ret;
2055 }
2056
2057 /**
2058 * nfs_refresh_inode - try to update the inode attribute cache
2059 * @inode: pointer to inode
2060 * @fattr: updated attributes
2061 *
2062 * Check that an RPC call that returned attributes has not overlapped with
2063 * other recent updates of the inode metadata, then decide whether it is
2064 * safe to do a full update of the inode attributes, or whether just to
2065 * call nfs_check_inode_attributes.
2066 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)2067 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
2068 {
2069 int status;
2070
2071 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2072 return 0;
2073 spin_lock(&inode->i_lock);
2074 status = nfs_refresh_inode_locked(inode, fattr);
2075 spin_unlock(&inode->i_lock);
2076
2077 return status;
2078 }
2079 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
2080
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)2081 static int nfs_post_op_update_inode_locked(struct inode *inode,
2082 struct nfs_fattr *fattr, unsigned int invalid)
2083 {
2084 if (S_ISDIR(inode->i_mode))
2085 invalid |= NFS_INO_INVALID_DATA;
2086 nfs_set_cache_invalid(inode, invalid);
2087 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2088 return 0;
2089 return nfs_refresh_inode_locked(inode, fattr);
2090 }
2091
2092 /**
2093 * nfs_post_op_update_inode - try to update the inode attribute cache
2094 * @inode: pointer to inode
2095 * @fattr: updated attributes
2096 *
2097 * After an operation that has changed the inode metadata, mark the
2098 * attribute cache as being invalid, then try to update it.
2099 *
2100 * NB: if the server didn't return any post op attributes, this
2101 * function will force the retrieval of attributes before the next
2102 * NFS request. Thus it should be used only for operations that
2103 * are expected to change one or more attributes, to avoid
2104 * unnecessary NFS requests and trips through nfs_update_inode().
2105 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)2106 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2107 {
2108 int status;
2109
2110 spin_lock(&inode->i_lock);
2111 nfs_fattr_set_barrier(fattr);
2112 status = nfs_post_op_update_inode_locked(inode, fattr,
2113 NFS_INO_INVALID_CHANGE
2114 | NFS_INO_INVALID_CTIME
2115 | NFS_INO_REVAL_FORCED);
2116 spin_unlock(&inode->i_lock);
2117
2118 return status;
2119 }
2120 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
2121
2122 /**
2123 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
2124 * @inode: pointer to inode
2125 * @fattr: updated attributes
2126 *
2127 * After an operation that has changed the inode metadata, mark the
2128 * attribute cache as being invalid, then try to update it. Fake up
2129 * weak cache consistency data, if none exist.
2130 *
2131 * This function is mainly designed to be used by the ->write_done() functions.
2132 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)2133 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
2134 {
2135 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2136 int status;
2137
2138 /* Don't do a WCC update if these attributes are already stale */
2139 if (attr_cmp < 0)
2140 return 0;
2141 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
2142 /* Record the pre/post change info before clearing PRECHANGE */
2143 nfs_ooo_record(NFS_I(inode), fattr);
2144 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
2145 | NFS_ATTR_FATTR_PRESIZE
2146 | NFS_ATTR_FATTR_PREMTIME
2147 | NFS_ATTR_FATTR_PRECTIME);
2148 goto out_noforce;
2149 }
2150 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2151 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
2152 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
2153 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
2154 }
2155 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
2156 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2157 fattr->pre_ctime = inode_get_ctime(inode);
2158 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2159 }
2160 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2161 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2162 fattr->pre_mtime = inode_get_mtime(inode);
2163 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2164 }
2165 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2166 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2167 fattr->pre_size = i_size_read(inode);
2168 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2169 }
2170 out_noforce:
2171 status = nfs_post_op_update_inode_locked(inode, fattr,
2172 NFS_INO_INVALID_CHANGE
2173 | NFS_INO_INVALID_CTIME
2174 | NFS_INO_INVALID_MTIME
2175 | NFS_INO_INVALID_BLOCKS);
2176 return status;
2177 }
2178
2179 /**
2180 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2181 * @inode: pointer to inode
2182 * @fattr: updated attributes
2183 *
2184 * After an operation that has changed the inode metadata, mark the
2185 * attribute cache as being invalid, then try to update it. Fake up
2186 * weak cache consistency data, if none exist.
2187 *
2188 * This function is mainly designed to be used by the ->write_done() functions.
2189 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2190 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2191 {
2192 int status;
2193
2194 spin_lock(&inode->i_lock);
2195 nfs_fattr_set_barrier(fattr);
2196 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2197 spin_unlock(&inode->i_lock);
2198 return status;
2199 }
2200 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2201
2202
2203 /*
2204 * Many nfs protocol calls return the new file attributes after
2205 * an operation. Here we update the inode to reflect the state
2206 * of the server's inode.
2207 *
2208 * This is a bit tricky because we have to make sure all dirty pages
2209 * have been sent off to the server before calling invalidate_inode_pages.
2210 * To make sure no other process adds more write requests while we try
2211 * our best to flush them, we make them sleep during the attribute refresh.
2212 *
2213 * A very similar scenario holds for the dir cache.
2214 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2215 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2216 {
2217 struct nfs_server *server = NFS_SERVER(inode);
2218 struct nfs_inode *nfsi = NFS_I(inode);
2219 loff_t cur_isize, new_isize;
2220 u64 fattr_supported = server->fattr_valid;
2221 unsigned long invalid = 0;
2222 unsigned long now = jiffies;
2223 unsigned long save_cache_validity;
2224 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2225 bool cache_revalidated = true;
2226 bool attr_changed = false;
2227 bool have_delegation;
2228
2229 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%llx)\n",
2230 __func__, inode->i_sb->s_id, inode->i_ino,
2231 nfs_display_fhandle_hash(NFS_FH(inode)),
2232 atomic_read(&inode->i_count), fattr->valid);
2233
2234 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2235 /* Only a mounted-on-fileid? Just exit */
2236 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2237 return 0;
2238 /* Has the inode gone and changed behind our back? */
2239 } else if (nfsi->fileid != fattr->fileid) {
2240 /* Is this perhaps the mounted-on fileid? */
2241 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2242 nfsi->fileid == fattr->mounted_on_fileid)
2243 return 0;
2244 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2245 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2246 NFS_SERVER(inode)->nfs_client->cl_hostname,
2247 inode->i_sb->s_id, (long long)nfsi->fileid,
2248 (long long)fattr->fileid);
2249 goto out_err;
2250 }
2251
2252 /*
2253 * Make sure the inode's type hasn't changed.
2254 */
2255 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2256 /*
2257 * Big trouble! The inode has become a different object.
2258 */
2259 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2260 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2261 goto out_err;
2262 }
2263
2264 /* Update the fsid? */
2265 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2266 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2267 !IS_AUTOMOUNT(inode))
2268 server->fsid = fattr->fsid;
2269
2270 /* Save the delegation state before clearing cache_validity */
2271 have_delegation = nfs_have_delegated_attributes(inode);
2272
2273 /*
2274 * Update the read time so we don't revalidate too often.
2275 */
2276 nfsi->read_cache_jiffies = fattr->time_start;
2277
2278 /* Fix up any delegated attributes in the struct nfs_fattr */
2279 nfs_fattr_fixup_delegated(inode, fattr);
2280
2281 save_cache_validity = nfsi->cache_validity;
2282 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2283 | NFS_INO_INVALID_ATIME
2284 | NFS_INO_REVAL_FORCED
2285 | NFS_INO_INVALID_BLOCKS);
2286
2287 /* Do atomic weak cache consistency updates */
2288 nfs_wcc_update_inode(inode, fattr);
2289
2290 if (pnfs_layoutcommit_outstanding(inode)) {
2291 nfsi->cache_validity |=
2292 save_cache_validity &
2293 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2294 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2295 NFS_INO_INVALID_BLOCKS);
2296 cache_revalidated = false;
2297 }
2298
2299 /* More cache consistency checks */
2300 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2301 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2302 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2303 /* There is one remaining gap that hasn't been
2304 * merged into iversion - do that now.
2305 */
2306 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2307 kfree(nfsi->ooo);
2308 nfsi->ooo = NULL;
2309 }
2310 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2311 /* Could it be a race with writeback? */
2312 if (!(have_writers || have_delegation)) {
2313 invalid |= NFS_INO_INVALID_DATA
2314 | NFS_INO_INVALID_ACCESS
2315 | NFS_INO_INVALID_ACL
2316 | NFS_INO_INVALID_XATTR;
2317 /* Force revalidate of all attributes */
2318 save_cache_validity |= NFS_INO_INVALID_CTIME
2319 | NFS_INO_INVALID_MTIME
2320 | NFS_INO_INVALID_SIZE
2321 | NFS_INO_INVALID_BLOCKS
2322 | NFS_INO_INVALID_NLINK
2323 | NFS_INO_INVALID_MODE
2324 | NFS_INO_INVALID_OTHER
2325 | NFS_INO_INVALID_BTIME;
2326 if (S_ISDIR(inode->i_mode))
2327 nfs_force_lookup_revalidate(inode);
2328 attr_changed = true;
2329 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2330 inode->i_sb->s_id,
2331 inode->i_ino);
2332 } else if (!have_delegation) {
2333 nfs_ooo_record(nfsi, fattr);
2334 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2335 fattr->change_attr);
2336 }
2337 inode_set_iversion_raw(inode, fattr->change_attr);
2338 }
2339 } else {
2340 nfsi->cache_validity |=
2341 save_cache_validity & NFS_INO_INVALID_CHANGE;
2342 if (!have_delegation ||
2343 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2344 cache_revalidated = false;
2345 }
2346
2347 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2348 inode_set_mtime_to_ts(inode, fattr->mtime);
2349 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2350 nfsi->cache_validity |=
2351 save_cache_validity & NFS_INO_INVALID_MTIME;
2352
2353 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2354 inode_set_ctime_to_ts(inode, fattr->ctime);
2355 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2356 nfsi->cache_validity |=
2357 save_cache_validity & NFS_INO_INVALID_CTIME;
2358
2359 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
2360 nfsi->btime = fattr->btime;
2361 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
2362 nfsi->cache_validity |=
2363 save_cache_validity & NFS_INO_INVALID_BTIME;
2364
2365 /* Check if our cached file size is stale */
2366 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2367 new_isize = nfs_size_to_loff_t(fattr->size);
2368 cur_isize = i_size_read(inode);
2369 if (new_isize != cur_isize && !have_delegation) {
2370 /* Do we perhaps have any outstanding writes, or has
2371 * the file grown beyond our last write? */
2372 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2373 trace_nfs_size_update(inode, new_isize);
2374 i_size_write(inode, new_isize);
2375 if (!have_writers)
2376 invalid |= NFS_INO_INVALID_DATA;
2377 }
2378 }
2379 if (new_isize == 0 &&
2380 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2381 NFS_ATTR_FATTR_BLOCKS_USED))) {
2382 fattr->du.nfs3.used = 0;
2383 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2384 }
2385 } else
2386 nfsi->cache_validity |=
2387 save_cache_validity & NFS_INO_INVALID_SIZE;
2388
2389 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2390 inode_set_atime_to_ts(inode, fattr->atime);
2391 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2392 nfsi->cache_validity |=
2393 save_cache_validity & NFS_INO_INVALID_ATIME;
2394
2395 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2396 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2397 umode_t newmode = inode->i_mode & S_IFMT;
2398 newmode |= fattr->mode & S_IALLUGO;
2399 inode->i_mode = newmode;
2400 invalid |= NFS_INO_INVALID_ACCESS
2401 | NFS_INO_INVALID_ACL;
2402 }
2403 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2404 nfsi->cache_validity |=
2405 save_cache_validity & NFS_INO_INVALID_MODE;
2406
2407 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2408 if (!uid_eq(inode->i_uid, fattr->uid)) {
2409 invalid |= NFS_INO_INVALID_ACCESS
2410 | NFS_INO_INVALID_ACL;
2411 inode->i_uid = fattr->uid;
2412 }
2413 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2414 nfsi->cache_validity |=
2415 save_cache_validity & NFS_INO_INVALID_OTHER;
2416
2417 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2418 if (!gid_eq(inode->i_gid, fattr->gid)) {
2419 invalid |= NFS_INO_INVALID_ACCESS
2420 | NFS_INO_INVALID_ACL;
2421 inode->i_gid = fattr->gid;
2422 }
2423 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2424 nfsi->cache_validity |=
2425 save_cache_validity & NFS_INO_INVALID_OTHER;
2426
2427 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2428 if (inode->i_nlink != fattr->nlink)
2429 set_nlink(inode, fattr->nlink);
2430 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2431 nfsi->cache_validity |=
2432 save_cache_validity & NFS_INO_INVALID_NLINK;
2433
2434 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2435 /*
2436 * report the blocks in 512byte units
2437 */
2438 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2439 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2440 nfsi->cache_validity |=
2441 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2442
2443 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2444 inode->i_blocks = fattr->du.nfs2.blocks;
2445 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2446 nfsi->cache_validity |=
2447 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2448
2449 /* Update attrtimeo value if we're out of the unstable period */
2450 if (attr_changed) {
2451 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2452 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2453 nfsi->attrtimeo_timestamp = now;
2454 /* Set barrier to be more recent than all outstanding updates */
2455 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2456 } else {
2457 if (cache_revalidated) {
2458 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2459 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2460 nfsi->attrtimeo <<= 1;
2461 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2462 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2463 }
2464 nfsi->attrtimeo_timestamp = now;
2465 }
2466 /* Set the barrier to be more recent than this fattr */
2467 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2468 nfsi->attr_gencount = fattr->gencount;
2469 }
2470
2471 /* Don't invalidate the data if we were to blame */
2472 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2473 || S_ISLNK(inode->i_mode)))
2474 invalid &= ~NFS_INO_INVALID_DATA;
2475 nfs_set_cache_invalid(inode, invalid);
2476
2477 return 0;
2478 out_err:
2479 /*
2480 * No need to worry about unhashing the dentry, as the
2481 * lookup validation will know that the inode is bad.
2482 * (But we fall through to invalidate the caches.)
2483 */
2484 nfs_set_inode_stale_locked(inode);
2485 return -ESTALE;
2486 }
2487
nfs_alloc_inode(struct super_block * sb)2488 struct inode *nfs_alloc_inode(struct super_block *sb)
2489 {
2490 struct nfs_inode *nfsi;
2491 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2492 if (!nfsi)
2493 return NULL;
2494 nfsi->flags = 0UL;
2495 nfsi->cache_validity = 0UL;
2496 nfsi->ooo = NULL;
2497 #if IS_ENABLED(CONFIG_NFS_V4)
2498 nfsi->nfs4_acl = NULL;
2499 #endif /* CONFIG_NFS_V4 */
2500 #ifdef CONFIG_NFS_V4_2
2501 nfsi->xattr_cache = NULL;
2502 #endif
2503 nfs_netfs_inode_init(nfsi);
2504
2505 return &nfsi->vfs_inode;
2506 }
2507 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2508
nfs_free_inode(struct inode * inode)2509 void nfs_free_inode(struct inode *inode)
2510 {
2511 kfree(NFS_I(inode)->ooo);
2512 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2513 }
2514 EXPORT_SYMBOL_GPL(nfs_free_inode);
2515
nfs4_init_once(struct nfs_inode * nfsi)2516 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2517 {
2518 #if IS_ENABLED(CONFIG_NFS_V4)
2519 INIT_LIST_HEAD(&nfsi->open_states);
2520 nfsi->delegation = NULL;
2521 init_rwsem(&nfsi->rwsem);
2522 nfsi->layout = NULL;
2523 #endif
2524 }
2525
init_once(void * foo)2526 static void init_once(void *foo)
2527 {
2528 struct nfs_inode *nfsi = foo;
2529
2530 inode_init_once(&nfsi->vfs_inode);
2531 INIT_LIST_HEAD(&nfsi->open_files);
2532 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2533 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2534 nfs4_init_once(nfsi);
2535 }
2536
nfs_init_inodecache(void)2537 static int __init nfs_init_inodecache(void)
2538 {
2539 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2540 sizeof(struct nfs_inode),
2541 0, (SLAB_RECLAIM_ACCOUNT|
2542 SLAB_ACCOUNT),
2543 init_once);
2544 if (nfs_inode_cachep == NULL)
2545 return -ENOMEM;
2546
2547 return 0;
2548 }
2549
nfs_destroy_inodecache(void)2550 static void nfs_destroy_inodecache(void)
2551 {
2552 /*
2553 * Make sure all delayed rcu free inodes are flushed before we
2554 * destroy cache.
2555 */
2556 rcu_barrier();
2557 kmem_cache_destroy(nfs_inode_cachep);
2558 }
2559
2560 struct workqueue_struct *nfslocaliod_workqueue;
2561 struct workqueue_struct *nfsiod_workqueue;
2562 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2563
2564 /*
2565 * Destroy the nfsiod workqueues
2566 */
nfsiod_stop(void)2567 static void nfsiod_stop(void)
2568 {
2569 struct workqueue_struct *wq;
2570
2571 wq = nfsiod_workqueue;
2572 if (wq != NULL) {
2573 nfsiod_workqueue = NULL;
2574 destroy_workqueue(wq);
2575 }
2576 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2577 wq = nfslocaliod_workqueue;
2578 if (wq != NULL) {
2579 nfslocaliod_workqueue = NULL;
2580 destroy_workqueue(wq);
2581 }
2582 #endif /* CONFIG_NFS_LOCALIO */
2583 }
2584
2585 /*
2586 * Start the nfsiod workqueues
2587 */
nfsiod_start(void)2588 static int nfsiod_start(void)
2589 {
2590 dprintk("RPC: creating workqueue nfsiod\n");
2591 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2592 if (nfsiod_workqueue == NULL)
2593 return -ENOMEM;
2594 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2595 /*
2596 * localio writes need to use a normal (non-memreclaim) workqueue.
2597 * When we start getting low on space, XFS goes and calls flush_work() on
2598 * a non-memreclaim work queue, which causes a priority inversion problem.
2599 */
2600 dprintk("RPC: creating workqueue nfslocaliod\n");
2601 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0);
2602 if (unlikely(nfslocaliod_workqueue == NULL)) {
2603 nfsiod_stop();
2604 return -ENOMEM;
2605 }
2606 #endif /* CONFIG_NFS_LOCALIO */
2607 return 0;
2608 }
2609
2610 unsigned int nfs_net_id;
2611 EXPORT_SYMBOL_GPL(nfs_net_id);
2612
nfs_net_init(struct net * net)2613 static int nfs_net_init(struct net *net)
2614 {
2615 struct nfs_net *nn = net_generic(net, nfs_net_id);
2616 int err;
2617
2618 nfs_clients_init(net);
2619
2620 if (!rpc_proc_register(net, &nn->rpcstats)) {
2621 err = -ENOMEM;
2622 goto err_proc_rpc;
2623 }
2624
2625 err = nfs_fs_proc_net_init(net);
2626 if (err)
2627 goto err_proc_nfs;
2628
2629 return 0;
2630
2631 err_proc_nfs:
2632 rpc_proc_unregister(net, "nfs");
2633 err_proc_rpc:
2634 nfs_clients_exit(net);
2635 return err;
2636 }
2637
nfs_net_exit(struct net * net)2638 static void nfs_net_exit(struct net *net)
2639 {
2640 rpc_proc_unregister(net, "nfs");
2641 nfs_fs_proc_net_exit(net);
2642 nfs_clients_exit(net);
2643 }
2644
2645 static struct pernet_operations nfs_net_ops = {
2646 .init = nfs_net_init,
2647 .exit = nfs_net_exit,
2648 .id = &nfs_net_id,
2649 .size = sizeof(struct nfs_net),
2650 };
2651
2652 #ifdef CONFIG_KEYS
2653 static struct key *nfs_keyring;
2654
nfs_init_keyring(void)2655 static int __init nfs_init_keyring(void)
2656 {
2657 nfs_keyring = keyring_alloc(".nfs",
2658 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
2659 current_cred(),
2660 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
2661 (KEY_USR_ALL & ~KEY_USR_SETATTR),
2662 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
2663 return PTR_ERR_OR_ZERO(nfs_keyring);
2664 }
2665
nfs_exit_keyring(void)2666 static void nfs_exit_keyring(void)
2667 {
2668 key_put(nfs_keyring);
2669 }
2670 #else
nfs_init_keyring(void)2671 static inline int nfs_init_keyring(void)
2672 {
2673 return 0;
2674 }
2675
nfs_exit_keyring(void)2676 static inline void nfs_exit_keyring(void)
2677 {
2678 }
2679 #endif /* CONFIG_KEYS */
2680
2681 /*
2682 * Initialize NFS
2683 */
init_nfs_fs(void)2684 static int __init init_nfs_fs(void)
2685 {
2686 int err;
2687
2688 err = nfs_init_keyring();
2689 if (err)
2690 return err;
2691
2692 err = nfs_sysfs_init();
2693 if (err < 0)
2694 goto out10;
2695
2696 err = register_pernet_subsys(&nfs_net_ops);
2697 if (err < 0)
2698 goto out9;
2699
2700 err = nfsiod_start();
2701 if (err)
2702 goto out7;
2703
2704 err = nfs_fs_proc_init();
2705 if (err)
2706 goto out6;
2707
2708 err = nfs_init_nfspagecache();
2709 if (err)
2710 goto out5;
2711
2712 err = nfs_init_inodecache();
2713 if (err)
2714 goto out4;
2715
2716 err = nfs_init_readpagecache();
2717 if (err)
2718 goto out3;
2719
2720 err = nfs_init_writepagecache();
2721 if (err)
2722 goto out2;
2723
2724 err = nfs_init_directcache();
2725 if (err)
2726 goto out1;
2727
2728 err = register_nfs_fs();
2729 if (err)
2730 goto out0;
2731
2732 return 0;
2733 out0:
2734 nfs_destroy_directcache();
2735 out1:
2736 nfs_destroy_writepagecache();
2737 out2:
2738 nfs_destroy_readpagecache();
2739 out3:
2740 nfs_destroy_inodecache();
2741 out4:
2742 nfs_destroy_nfspagecache();
2743 out5:
2744 nfs_fs_proc_exit();
2745 out6:
2746 nfsiod_stop();
2747 out7:
2748 unregister_pernet_subsys(&nfs_net_ops);
2749 out9:
2750 nfs_sysfs_exit();
2751 out10:
2752 nfs_exit_keyring();
2753 return err;
2754 }
2755
exit_nfs_fs(void)2756 static void __exit exit_nfs_fs(void)
2757 {
2758 nfs_destroy_directcache();
2759 nfs_destroy_writepagecache();
2760 nfs_destroy_readpagecache();
2761 nfs_destroy_inodecache();
2762 nfs_destroy_nfspagecache();
2763 unregister_pernet_subsys(&nfs_net_ops);
2764 unregister_nfs_fs();
2765 nfs_fs_proc_exit();
2766 nfsiod_stop();
2767 nfs_sysfs_exit();
2768 nfs_exit_keyring();
2769 }
2770
2771 /* Not quite true; I just maintain it */
2772 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2773 MODULE_DESCRIPTION("NFS client support");
2774 MODULE_LICENSE("GPL");
2775 module_param(enable_ino64, bool, 0644);
2776
2777 module_init(init_nfs_fs)
2778 module_exit(exit_nfs_fs)
2779