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