1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 */
16
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/sched/signal.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/stat.h>
25 #include <linux/errno.h>
26 #include <linux/unistd.h>
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/stats.h>
29 #include <linux/sunrpc/metrics.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_mount.h>
32 #include <linux/nfs4_mount.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
42 #include <linux/uaccess.h>
43 #include <linux/iversion.h>
44
45 #include "nfs4_fs.h"
46 #include "callback.h"
47 #include "delegation.h"
48 #include "iostat.h"
49 #include "internal.h"
50 #include "fscache.h"
51 #include "pnfs.h"
52 #include "nfs.h"
53 #include "netns.h"
54 #include "sysfs.h"
55
56 #include "nfstrace.h"
57
58 #define NFSDBG_FACILITY NFSDBG_VFS
59
60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62 /* Default is to see 64-bit inode numbers */
63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67 static struct kmem_cache * nfs_inode_cachep;
68
69 static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr * fattr)70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 {
72 return nfs_fileid_to_ino_t(fattr->fileid);
73 }
74
nfs_wait_bit_killable(struct wait_bit_key * key,int mode)75 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
76 {
77 if (unlikely(nfs_current_task_exiting()))
78 return -EINTR;
79 schedule();
80 if (signal_pending_state(mode, current))
81 return -ERESTARTSYS;
82 return 0;
83 }
84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
85
86 /**
87 * nfs_compat_user_ino64 - returns the user-visible inode number
88 * @fileid: 64-bit fileid
89 *
90 * This function returns a 32-bit inode number if the boot parameter
91 * nfs.enable_ino64 is zero.
92 */
nfs_compat_user_ino64(u64 fileid)93 u64 nfs_compat_user_ino64(u64 fileid)
94 {
95 #ifdef CONFIG_COMPAT
96 compat_ulong_t ino;
97 #else
98 unsigned long ino;
99 #endif
100
101 if (enable_ino64)
102 return fileid;
103 ino = fileid;
104 if (sizeof(ino) < sizeof(fileid))
105 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
106 return ino;
107 }
108
nfs_drop_inode(struct inode * inode)109 int nfs_drop_inode(struct inode *inode)
110 {
111 return NFS_STALE(inode) || generic_drop_inode(inode);
112 }
113 EXPORT_SYMBOL_GPL(nfs_drop_inode);
114
nfs_clear_inode(struct inode * inode)115 void nfs_clear_inode(struct inode *inode)
116 {
117 /*
118 * The following should never happen...
119 */
120 WARN_ON_ONCE(nfs_have_writebacks(inode));
121 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
122 nfs_zap_acl_cache(inode);
123 nfs_access_zap_cache(inode);
124 nfs_fscache_clear_inode(inode);
125 }
126 EXPORT_SYMBOL_GPL(nfs_clear_inode);
127
nfs_evict_inode(struct inode * inode)128 void nfs_evict_inode(struct inode *inode)
129 {
130 truncate_inode_pages_final(&inode->i_data);
131 clear_inode(inode);
132 nfs_clear_inode(inode);
133 }
134
nfs_sync_inode(struct inode * inode)135 int nfs_sync_inode(struct inode *inode)
136 {
137 inode_dio_wait(inode);
138 return nfs_wb_all(inode);
139 }
140 EXPORT_SYMBOL_GPL(nfs_sync_inode);
141
142 /**
143 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
144 * @mapping: pointer to struct address_space
145 */
nfs_sync_mapping(struct address_space * mapping)146 int nfs_sync_mapping(struct address_space *mapping)
147 {
148 int ret = 0;
149
150 if (mapping->nrpages != 0) {
151 unmap_mapping_range(mapping, 0, 0, 0);
152 ret = nfs_wb_all(mapping->host);
153 }
154 return ret;
155 }
156
nfs_attribute_timeout(struct inode * inode)157 static int nfs_attribute_timeout(struct inode *inode)
158 {
159 struct nfs_inode *nfsi = NFS_I(inode);
160
161 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
162 }
163
nfs_check_cache_flags_invalid(struct inode * inode,unsigned long flags)164 static bool nfs_check_cache_flags_invalid(struct inode *inode,
165 unsigned long flags)
166 {
167 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
168
169 return (cache_validity & flags) != 0;
170 }
171
nfs_check_cache_invalid(struct inode * inode,unsigned long flags)172 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
173 {
174 if (nfs_check_cache_flags_invalid(inode, flags))
175 return true;
176 return nfs_attribute_cache_expired(inode);
177 }
178 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
179
180 #ifdef CONFIG_NFS_V4_2
nfs_has_xattr_cache(const struct nfs_inode * nfsi)181 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
182 {
183 return nfsi->xattr_cache != NULL;
184 }
185 #else
nfs_has_xattr_cache(const struct nfs_inode * nfsi)186 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
187 {
188 return false;
189 }
190 #endif
191
nfs_set_cache_invalid(struct inode * inode,unsigned long flags)192 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
193 {
194 struct nfs_inode *nfsi = NFS_I(inode);
195
196 if (nfs_have_delegated_attributes(inode)) {
197 if (!(flags & NFS_INO_REVAL_FORCED))
198 flags &= ~(NFS_INO_INVALID_MODE |
199 NFS_INO_INVALID_OTHER |
200 NFS_INO_INVALID_BTIME |
201 NFS_INO_INVALID_XATTR);
202 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
203 }
204
205 if (!nfs_has_xattr_cache(nfsi))
206 flags &= ~NFS_INO_INVALID_XATTR;
207 if (flags & NFS_INO_INVALID_DATA)
208 nfs_fscache_invalidate(inode, 0);
209 flags &= ~NFS_INO_REVAL_FORCED;
210
211 flags |= nfsi->cache_validity;
212 if (inode->i_mapping->nrpages == 0)
213 flags &= ~NFS_INO_INVALID_DATA;
214
215 /* pairs with nfs_clear_invalid_mapping()'s smp_load_acquire() */
216 smp_store_release(&nfsi->cache_validity, flags);
217
218 if (inode->i_mapping->nrpages == 0 ||
219 nfsi->cache_validity & NFS_INO_INVALID_DATA) {
220 nfs_ooo_clear(nfsi);
221 }
222 trace_nfs_set_cache_invalid(inode, 0);
223 }
224 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
225
226 /*
227 * Invalidate the local caches
228 */
nfs_zap_caches_locked(struct inode * inode)229 static void nfs_zap_caches_locked(struct inode *inode)
230 {
231 struct nfs_inode *nfsi = NFS_I(inode);
232 int mode = inode->i_mode;
233
234 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
235
236 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
237 nfsi->attrtimeo_timestamp = jiffies;
238
239 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
240 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
241 NFS_INO_INVALID_DATA |
242 NFS_INO_INVALID_ACCESS |
243 NFS_INO_INVALID_ACL |
244 NFS_INO_INVALID_XATTR);
245 else
246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
247 NFS_INO_INVALID_ACCESS |
248 NFS_INO_INVALID_ACL |
249 NFS_INO_INVALID_XATTR);
250 nfs_zap_label_cache_locked(nfsi);
251 }
252
nfs_zap_caches(struct inode * inode)253 void nfs_zap_caches(struct inode *inode)
254 {
255 spin_lock(&inode->i_lock);
256 nfs_zap_caches_locked(inode);
257 spin_unlock(&inode->i_lock);
258 }
259
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)260 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
261 {
262 if (mapping->nrpages != 0) {
263 spin_lock(&inode->i_lock);
264 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
265 spin_unlock(&inode->i_lock);
266 }
267 }
268
nfs_zap_acl_cache(struct inode * inode)269 void nfs_zap_acl_cache(struct inode *inode)
270 {
271 void (*clear_acl_cache)(struct inode *);
272
273 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
274 if (clear_acl_cache != NULL)
275 clear_acl_cache(inode);
276 spin_lock(&inode->i_lock);
277 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
278 spin_unlock(&inode->i_lock);
279 }
280 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
281
nfs_invalidate_atime(struct inode * inode)282 void nfs_invalidate_atime(struct inode *inode)
283 {
284 if (nfs_have_delegated_atime(inode))
285 return;
286 spin_lock(&inode->i_lock);
287 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
288 spin_unlock(&inode->i_lock);
289 }
290 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
291
292 /*
293 * Invalidate, but do not unhash, the inode.
294 * NB: must be called with inode->i_lock held!
295 */
nfs_set_inode_stale_locked(struct inode * inode)296 static void nfs_set_inode_stale_locked(struct inode *inode)
297 {
298 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
299 nfs_zap_caches_locked(inode);
300 trace_nfs_set_inode_stale(inode);
301 }
302
nfs_set_inode_stale(struct inode * inode)303 void nfs_set_inode_stale(struct inode *inode)
304 {
305 spin_lock(&inode->i_lock);
306 nfs_set_inode_stale_locked(inode);
307 spin_unlock(&inode->i_lock);
308 }
309
310 struct nfs_find_desc {
311 struct nfs_fh *fh;
312 struct nfs_fattr *fattr;
313 };
314
315 /*
316 * In NFSv3 we can have 64bit inode numbers. In order to support
317 * this, and re-exported directories (also seen in NFSv2)
318 * we are forced to allow 2 different inodes to have the same
319 * i_ino.
320 */
321 static int
nfs_find_actor(struct inode * inode,void * opaque)322 nfs_find_actor(struct inode *inode, void *opaque)
323 {
324 struct nfs_find_desc *desc = opaque;
325 struct nfs_fh *fh = desc->fh;
326 struct nfs_fattr *fattr = desc->fattr;
327
328 if (NFS_FILEID(inode) != fattr->fileid)
329 return 0;
330 if (inode_wrong_type(inode, fattr->mode))
331 return 0;
332 if (nfs_compare_fh(NFS_FH(inode), fh))
333 return 0;
334 if (is_bad_inode(inode) || NFS_STALE(inode))
335 return 0;
336 return 1;
337 }
338
339 static int
nfs_init_locked(struct inode * inode,void * opaque)340 nfs_init_locked(struct inode *inode, void *opaque)
341 {
342 struct nfs_find_desc *desc = opaque;
343 struct nfs_fattr *fattr = desc->fattr;
344
345 set_nfs_fileid(inode, fattr->fileid);
346 inode->i_mode = fattr->mode;
347 nfs_copy_fh(NFS_FH(inode), desc->fh);
348 return 0;
349 }
350
351 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)352 static void nfs_clear_label_invalid(struct inode *inode)
353 {
354 spin_lock(&inode->i_lock);
355 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
356 spin_unlock(&inode->i_lock);
357 }
358
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)359 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
360 {
361 int error;
362
363 if (fattr->label == NULL)
364 return;
365
366 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
367 error = security_inode_notifysecctx(inode, fattr->label->label,
368 fattr->label->len);
369 if (error)
370 printk(KERN_ERR "%s() %s %d "
371 "security_inode_notifysecctx() %d\n",
372 __func__,
373 (char *)fattr->label->label,
374 fattr->label->len, error);
375 nfs_clear_label_invalid(inode);
376 }
377 }
378
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)379 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
380 {
381 struct nfs4_label *label;
382
383 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
384 return NULL;
385
386 label = kzalloc(sizeof(struct nfs4_label), flags);
387 if (label == NULL)
388 return ERR_PTR(-ENOMEM);
389
390 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
391 if (label->label == NULL) {
392 kfree(label);
393 return ERR_PTR(-ENOMEM);
394 }
395 label->len = NFS4_MAXLABELLEN;
396
397 return label;
398 }
399 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
400 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)401 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
402 {
403 }
404 #endif
405 EXPORT_SYMBOL_GPL(nfs_setsecurity);
406
407 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
408 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)409 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
410 {
411 struct nfs_find_desc desc = {
412 .fh = fh,
413 .fattr = fattr,
414 };
415 struct inode *inode;
416 unsigned long hash;
417
418 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
419 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
420 return NULL;
421
422 hash = nfs_fattr_to_ino_t(fattr);
423 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
424
425 dprintk("%s: returning %p\n", __func__, inode);
426 return inode;
427 }
428
nfs_inode_init_regular(struct nfs_inode * nfsi)429 static void nfs_inode_init_regular(struct nfs_inode *nfsi)
430 {
431 atomic_long_set(&nfsi->nrequests, 0);
432 atomic_long_set(&nfsi->redirtied_pages, 0);
433 INIT_LIST_HEAD(&nfsi->commit_info.list);
434 atomic_long_set(&nfsi->commit_info.ncommit, 0);
435 atomic_set(&nfsi->commit_info.rpcs_out, 0);
436 mutex_init(&nfsi->commit_mutex);
437 }
438
nfs_inode_init_dir(struct nfs_inode * nfsi)439 static void nfs_inode_init_dir(struct nfs_inode *nfsi)
440 {
441 nfsi->cache_change_attribute = 0;
442 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
443 init_rwsem(&nfsi->rmdir_sem);
444 }
445
446 /*
447 * This is our front-end to iget that looks up inodes by file handle
448 * instead of inode number.
449 */
450 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr)451 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
452 {
453 struct nfs_find_desc desc = {
454 .fh = fh,
455 .fattr = fattr
456 };
457 struct inode *inode = ERR_PTR(-ENOENT);
458 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
459 unsigned long hash;
460
461 nfs_attr_check_mountpoint(sb, fattr);
462
463 if (nfs_attr_use_mounted_on_fileid(fattr))
464 fattr->fileid = fattr->mounted_on_fileid;
465 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
466 goto out_no_inode;
467 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
468 goto out_no_inode;
469
470 hash = nfs_fattr_to_ino_t(fattr);
471
472 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
473 if (inode == NULL) {
474 inode = ERR_PTR(-ENOMEM);
475 goto out_no_inode;
476 }
477
478 if (inode->i_state & I_NEW) {
479 struct nfs_inode *nfsi = NFS_I(inode);
480 unsigned long now = jiffies;
481
482 /* We set i_ino for the few things that still rely on it,
483 * such as stat(2) */
484 inode->i_ino = hash;
485
486 /* We can't support update_atime(), since the server will reset it */
487 inode->i_flags |= S_NOATIME|S_NOCMTIME;
488 inode->i_mode = fattr->mode;
489 nfsi->cache_validity = 0;
490 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
491 && (fattr_supported & NFS_ATTR_FATTR_MODE))
492 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
493 /* Why so? Because we want revalidate for devices/FIFOs, and
494 * that's precisely what we have in nfs_file_inode_operations.
495 */
496 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
497 if (S_ISREG(inode->i_mode)) {
498 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
499 inode->i_data.a_ops = &nfs_file_aops;
500 nfs_inode_init_regular(nfsi);
501 mapping_set_large_folios(inode->i_mapping);
502 } else if (S_ISDIR(inode->i_mode)) {
503 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
504 inode->i_fop = &nfs_dir_operations;
505 inode->i_data.a_ops = &nfs_dir_aops;
506 nfs_inode_init_dir(nfsi);
507 /* Deal with crossing mountpoints */
508 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
509 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
510 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
511 inode->i_op = &nfs_referral_inode_operations;
512 else
513 inode->i_op = &nfs_mountpoint_inode_operations;
514 inode->i_fop = NULL;
515 inode->i_flags |= S_AUTOMOUNT;
516 }
517 } else if (S_ISLNK(inode->i_mode)) {
518 inode->i_op = &nfs_symlink_inode_operations;
519 inode_nohighmem(inode);
520 } else
521 init_special_inode(inode, inode->i_mode, fattr->rdev);
522
523 inode_set_atime(inode, 0, 0);
524 inode_set_mtime(inode, 0, 0);
525 inode_set_ctime(inode, 0, 0);
526 memset(&nfsi->btime, 0, sizeof(nfsi->btime));
527 inode_set_iversion_raw(inode, 0);
528 inode->i_size = 0;
529 clear_nlink(inode);
530 inode->i_uid = make_kuid(&init_user_ns, -2);
531 inode->i_gid = make_kgid(&init_user_ns, -2);
532 inode->i_blocks = 0;
533 nfsi->write_io = 0;
534 nfsi->read_io = 0;
535
536 nfsi->read_cache_jiffies = fattr->time_start;
537 nfsi->attr_gencount = fattr->gencount;
538 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
539 inode_set_atime_to_ts(inode, fattr->atime);
540 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
542 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
543 inode_set_mtime_to_ts(inode, fattr->mtime);
544 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
546 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
547 inode_set_ctime_to_ts(inode, fattr->ctime);
548 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
550 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
551 nfsi->btime = fattr->btime;
552 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
553 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BTIME);
554 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
555 inode_set_iversion_raw(inode, fattr->change_attr);
556 else
557 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
558 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
559 inode->i_size = nfs_size_to_loff_t(fattr->size);
560 else
561 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
562 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
563 set_nlink(inode, fattr->nlink);
564 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
565 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
566 else
567 set_nlink(inode, 1);
568 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
569 inode->i_uid = fattr->uid;
570 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
571 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
572 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
573 inode->i_gid = fattr->gid;
574 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
575 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
576 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
577 inode->i_blocks = fattr->du.nfs2.blocks;
578 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
579 fattr->size != 0)
580 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
581 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
582 /*
583 * report the blocks in 512byte units
584 */
585 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
586 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
587 fattr->size != 0)
588 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
589
590 nfs_setsecurity(inode, fattr);
591
592 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
593 nfsi->attrtimeo_timestamp = now;
594 nfsi->access_cache = RB_ROOT;
595
596 nfs_fscache_init_inode(inode);
597
598 unlock_new_inode(inode);
599 } else {
600 int err = nfs_refresh_inode(inode, fattr);
601 if (err < 0) {
602 iput(inode);
603 inode = ERR_PTR(err);
604 goto out_no_inode;
605 }
606 }
607 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
608 inode->i_sb->s_id,
609 (unsigned long long)NFS_FILEID(inode),
610 nfs_display_fhandle_hash(fh),
611 atomic_read(&inode->i_count));
612
613 out:
614 return inode;
615
616 out_no_inode:
617 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
618 goto out;
619 }
620 EXPORT_SYMBOL_GPL(nfs_fhget);
621
622 static void
nfs_fattr_fixup_delegated(struct inode * inode,struct nfs_fattr * fattr)623 nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr)
624 {
625 unsigned long cache_validity = NFS_I(inode)->cache_validity;
626
627 if (nfs_have_delegated_mtime(inode)) {
628 if (!(cache_validity & NFS_INO_INVALID_CTIME))
629 fattr->valid &= ~(NFS_ATTR_FATTR_PRECTIME |
630 NFS_ATTR_FATTR_CTIME);
631
632 if (!(cache_validity & NFS_INO_INVALID_MTIME))
633 fattr->valid &= ~(NFS_ATTR_FATTR_PREMTIME |
634 NFS_ATTR_FATTR_MTIME);
635
636 if (!(cache_validity & NFS_INO_INVALID_ATIME))
637 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
638 } else if (nfs_have_delegated_atime(inode)) {
639 if (!(cache_validity & NFS_INO_INVALID_ATIME))
640 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
641 }
642 }
643
nfs_set_timestamps_to_ts(struct inode * inode,struct iattr * attr)644 static void nfs_set_timestamps_to_ts(struct inode *inode, struct iattr *attr)
645 {
646 unsigned int cache_flags = 0;
647
648 if (attr->ia_valid & ATTR_MTIME_SET) {
649 struct timespec64 ctime = inode_get_ctime(inode);
650 struct timespec64 mtime = inode_get_mtime(inode);
651 struct timespec64 now;
652 int updated = 0;
653
654 now = inode_set_ctime_current(inode);
655 if (!timespec64_equal(&now, &ctime))
656 updated |= S_CTIME;
657
658 inode_set_mtime_to_ts(inode, attr->ia_mtime);
659 if (!timespec64_equal(&now, &mtime))
660 updated |= S_MTIME;
661
662 inode_maybe_inc_iversion(inode, updated);
663 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
664 }
665 if (attr->ia_valid & ATTR_ATIME_SET) {
666 inode_set_atime_to_ts(inode, attr->ia_atime);
667 cache_flags |= NFS_INO_INVALID_ATIME;
668 }
669 NFS_I(inode)->cache_validity &= ~cache_flags;
670 }
671
nfs_update_timestamps(struct inode * inode,unsigned int ia_valid)672 static void nfs_update_timestamps(struct inode *inode, unsigned int ia_valid)
673 {
674 enum file_time_flags time_flags = 0;
675 unsigned int cache_flags = 0;
676
677 if (ia_valid & ATTR_MTIME) {
678 time_flags |= S_MTIME | S_CTIME;
679 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
680 }
681 if (ia_valid & ATTR_ATIME) {
682 time_flags |= S_ATIME;
683 cache_flags |= NFS_INO_INVALID_ATIME;
684 }
685 inode_update_timestamps(inode, time_flags);
686 NFS_I(inode)->cache_validity &= ~cache_flags;
687 }
688
nfs_update_delegated_atime(struct inode * inode)689 void nfs_update_delegated_atime(struct inode *inode)
690 {
691 spin_lock(&inode->i_lock);
692 if (nfs_have_delegated_atime(inode))
693 nfs_update_timestamps(inode, ATTR_ATIME);
694 spin_unlock(&inode->i_lock);
695 }
696
nfs_update_delegated_mtime_locked(struct inode * inode)697 void nfs_update_delegated_mtime_locked(struct inode *inode)
698 {
699 if (nfs_have_delegated_mtime(inode))
700 nfs_update_timestamps(inode, ATTR_MTIME);
701 }
702
nfs_update_delegated_mtime(struct inode * inode)703 void nfs_update_delegated_mtime(struct inode *inode)
704 {
705 spin_lock(&inode->i_lock);
706 nfs_update_delegated_mtime_locked(inode);
707 spin_unlock(&inode->i_lock);
708 }
709 EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime);
710
711 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
712
713 int
nfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)714 nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
715 struct iattr *attr)
716 {
717 struct inode *inode = d_inode(dentry);
718 struct nfs_fattr *fattr;
719 loff_t oldsize = i_size_read(inode);
720 int error = 0;
721
722 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
723
724 /* skip mode change if it's just for clearing setuid/setgid */
725 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
726 attr->ia_valid &= ~ATTR_MODE;
727
728 if (attr->ia_valid & ATTR_SIZE) {
729 BUG_ON(!S_ISREG(inode->i_mode));
730
731 error = inode_newsize_ok(inode, attr->ia_size);
732 if (error)
733 return error;
734
735 if (attr->ia_size == oldsize)
736 attr->ia_valid &= ~ATTR_SIZE;
737 }
738
739 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
740 spin_lock(&inode->i_lock);
741 if (attr->ia_valid & ATTR_MTIME_SET) {
742 nfs_set_timestamps_to_ts(inode, attr);
743 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET|
744 ATTR_ATIME|ATTR_ATIME_SET);
745 } else {
746 nfs_update_timestamps(inode, attr->ia_valid);
747 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME);
748 }
749 spin_unlock(&inode->i_lock);
750 } else if (nfs_have_delegated_atime(inode) &&
751 attr->ia_valid & ATTR_ATIME &&
752 !(attr->ia_valid & ATTR_MTIME)) {
753 if (attr->ia_valid & ATTR_ATIME_SET) {
754 spin_lock(&inode->i_lock);
755 nfs_set_timestamps_to_ts(inode, attr);
756 spin_unlock(&inode->i_lock);
757 attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
758 } else {
759 nfs_update_delegated_atime(inode);
760 attr->ia_valid &= ~ATTR_ATIME;
761 }
762 }
763
764 /* Optimization: if the end result is no change, don't RPC */
765 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
766 return 0;
767
768 trace_nfs_setattr_enter(inode);
769
770 /* Write all dirty data */
771 if (S_ISREG(inode->i_mode)) {
772 nfs_file_block_o_direct(NFS_I(inode));
773 nfs_sync_inode(inode);
774 }
775
776 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
777 if (fattr == NULL) {
778 error = -ENOMEM;
779 goto out;
780 }
781
782 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
783 if (error == 0) {
784 if (attr->ia_valid & ATTR_SIZE)
785 nfs_truncate_last_folio(inode->i_mapping, oldsize,
786 attr->ia_size);
787 error = nfs_refresh_inode(inode, fattr);
788 }
789 nfs_free_fattr(fattr);
790 out:
791 trace_nfs_setattr_exit(inode, error);
792 return error;
793 }
794 EXPORT_SYMBOL_GPL(nfs_setattr);
795
796 /**
797 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
798 * @inode: inode of the file used
799 * @offset: file offset to start truncating
800 *
801 * This is a copy of the common vmtruncate, but with the locking
802 * corrected to take into account the fact that NFS requires
803 * inode->i_size to be updated under the inode->i_lock.
804 * Note: must be called with inode->i_lock held!
805 */
nfs_vmtruncate(struct inode * inode,loff_t offset)806 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
807 {
808 int err;
809
810 err = inode_newsize_ok(inode, offset);
811 if (err)
812 goto out;
813
814 trace_nfs_size_truncate(inode, offset);
815 i_size_write(inode, offset);
816 /* Optimisation */
817 if (offset == 0) {
818 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
819 nfs_ooo_clear(NFS_I(inode));
820 }
821 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
822
823 spin_unlock(&inode->i_lock);
824 truncate_pagecache(inode, offset);
825 nfs_update_delegated_mtime_locked(inode);
826 spin_lock(&inode->i_lock);
827 out:
828 return err;
829 }
830
831 /**
832 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
833 * @inode: pointer to struct inode
834 * @attr: pointer to struct iattr
835 * @fattr: pointer to struct nfs_fattr
836 *
837 * Note: we do this in the *proc.c in order to ensure that
838 * it works for things like exclusive creates too.
839 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)840 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
841 struct nfs_fattr *fattr)
842 {
843 /* Barrier: bump the attribute generation count. */
844 nfs_fattr_set_barrier(fattr);
845
846 spin_lock(&inode->i_lock);
847 NFS_I(inode)->attr_gencount = fattr->gencount;
848 if ((attr->ia_valid & ATTR_SIZE) != 0) {
849 if (!nfs_have_delegated_mtime(inode))
850 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
851 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
852 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
853 nfs_vmtruncate(inode, attr->ia_size);
854 }
855 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
856 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
857 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
858 inode->i_mode & S_ISUID)
859 inode->i_mode &= ~S_ISUID;
860 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
861 inode->i_mode &= ~S_ISGID;
862 if ((attr->ia_valid & ATTR_MODE) != 0) {
863 int mode = attr->ia_mode & S_IALLUGO;
864 mode |= inode->i_mode & ~S_IALLUGO;
865 inode->i_mode = mode;
866 }
867 if ((attr->ia_valid & ATTR_UID) != 0)
868 inode->i_uid = attr->ia_uid;
869 if ((attr->ia_valid & ATTR_GID) != 0)
870 inode->i_gid = attr->ia_gid;
871 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
872 inode_set_ctime_to_ts(inode, fattr->ctime);
873 else
874 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
875 | NFS_INO_INVALID_CTIME);
876 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
877 | NFS_INO_INVALID_ACL);
878 }
879 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
880 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
881 | NFS_INO_INVALID_CTIME);
882 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
883 inode_set_atime_to_ts(inode, fattr->atime);
884 else if (attr->ia_valid & ATTR_ATIME_SET)
885 inode_set_atime_to_ts(inode, attr->ia_atime);
886 else
887 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
888
889 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
890 inode_set_ctime_to_ts(inode, fattr->ctime);
891 else
892 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
893 | NFS_INO_INVALID_CTIME);
894 }
895 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
896 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
897 | NFS_INO_INVALID_CTIME);
898 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
899 inode_set_mtime_to_ts(inode, fattr->mtime);
900 else if (attr->ia_valid & ATTR_MTIME_SET)
901 inode_set_mtime_to_ts(inode, attr->ia_mtime);
902 else
903 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
904
905 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
906 inode_set_ctime_to_ts(inode, fattr->ctime);
907 else
908 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
909 | NFS_INO_INVALID_CTIME);
910 }
911 if (fattr->valid)
912 nfs_update_inode(inode, fattr);
913 spin_unlock(&inode->i_lock);
914 }
915 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
916
917 /*
918 * Don't request help from readdirplus if the file is being written to,
919 * or if attribute caching is turned off
920 */
nfs_getattr_readdirplus_enable(const struct inode * inode)921 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
922 {
923 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
924 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
925 }
926
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)927 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
928 {
929 if (!IS_ROOT(dentry)) {
930 struct dentry *parent = dget_parent(dentry);
931 nfs_readdir_record_entry_cache_miss(d_inode(parent));
932 dput(parent);
933 }
934 }
935
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)936 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
937 {
938 if (!IS_ROOT(dentry)) {
939 struct dentry *parent = dget_parent(dentry);
940 nfs_readdir_record_entry_cache_hit(d_inode(parent));
941 dput(parent);
942 }
943 }
944
nfs_get_valid_attrmask(struct inode * inode)945 static u32 nfs_get_valid_attrmask(struct inode *inode)
946 {
947 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid;
948 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
949 u32 reply_mask = STATX_INO | STATX_TYPE;
950
951 if (!(cache_validity & NFS_INO_INVALID_ATIME))
952 reply_mask |= STATX_ATIME;
953 if (!(cache_validity & NFS_INO_INVALID_CTIME))
954 reply_mask |= STATX_CTIME;
955 if (!(cache_validity & NFS_INO_INVALID_MTIME))
956 reply_mask |= STATX_MTIME;
957 if (!(cache_validity & NFS_INO_INVALID_SIZE))
958 reply_mask |= STATX_SIZE;
959 if (!(cache_validity & NFS_INO_INVALID_NLINK))
960 reply_mask |= STATX_NLINK;
961 if (!(cache_validity & NFS_INO_INVALID_MODE))
962 reply_mask |= STATX_MODE;
963 if (!(cache_validity & NFS_INO_INVALID_OTHER))
964 reply_mask |= STATX_UID | STATX_GID;
965 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
966 reply_mask |= STATX_BLOCKS;
967 if (!(cache_validity & NFS_INO_INVALID_BTIME) &&
968 (fattr_valid & NFS_ATTR_FATTR_BTIME))
969 reply_mask |= STATX_BTIME;
970 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
971 reply_mask |= STATX_CHANGE_COOKIE;
972 return reply_mask;
973 }
974
nfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)975 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
976 struct kstat *stat, u32 request_mask, unsigned int query_flags)
977 {
978 struct inode *inode = d_inode(path->dentry);
979 struct nfs_server *server = NFS_SERVER(inode);
980 u64 fattr_valid = server->fattr_valid;
981 unsigned long cache_validity;
982 int err = 0;
983 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
984 bool do_update = false;
985 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
986
987 trace_nfs_getattr_enter(inode);
988
989 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
990 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
991 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME |
992 STATX_CHANGE_COOKIE;
993
994 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME))
995 request_mask &= ~STATX_BTIME;
996
997 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
998 if (readdirplus_enabled)
999 nfs_readdirplus_parent_cache_hit(path->dentry);
1000 goto out_no_revalidate;
1001 }
1002
1003 /* Flush out writes to the server in order to update c/mtime/version. */
1004 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
1005 S_ISREG(inode->i_mode)) {
1006 if (nfs_have_delegated_mtime(inode))
1007 filemap_fdatawrite(inode->i_mapping);
1008 else
1009 filemap_write_and_wait(inode->i_mapping);
1010 }
1011
1012 /*
1013 * We may force a getattr if the user cares about atime.
1014 *
1015 * Note that we only have to check the vfsmount flags here:
1016 * - NFS always sets S_NOATIME by so checking it would give a
1017 * bogus result
1018 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
1019 * no point in checking those.
1020 */
1021 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
1022 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1023 request_mask &= ~STATX_ATIME;
1024
1025 /* Is the user requesting attributes that might need revalidation? */
1026 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
1027 STATX_MTIME|STATX_UID|STATX_GID|
1028 STATX_SIZE|STATX_BLOCKS|STATX_BTIME|
1029 STATX_CHANGE_COOKIE)))
1030 goto out_no_revalidate;
1031
1032 /* Check whether the cached attributes are stale */
1033 do_update |= force_sync || nfs_attribute_cache_expired(inode);
1034 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
1035 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
1036 if (request_mask & STATX_ATIME)
1037 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
1038 if (request_mask & STATX_CTIME)
1039 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
1040 if (request_mask & STATX_MTIME)
1041 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
1042 if (request_mask & STATX_SIZE)
1043 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
1044 if (request_mask & STATX_NLINK)
1045 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
1046 if (request_mask & STATX_MODE)
1047 do_update |= cache_validity & NFS_INO_INVALID_MODE;
1048 if (request_mask & (STATX_UID | STATX_GID))
1049 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
1050 if (request_mask & STATX_BLOCKS)
1051 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
1052 if (request_mask & STATX_BTIME)
1053 do_update |= cache_validity & NFS_INO_INVALID_BTIME;
1054
1055 if (do_update) {
1056 if (readdirplus_enabled)
1057 nfs_readdirplus_parent_cache_miss(path->dentry);
1058 err = __nfs_revalidate_inode(server, inode);
1059 if (err)
1060 goto out;
1061 } else if (readdirplus_enabled)
1062 nfs_readdirplus_parent_cache_hit(path->dentry);
1063 out_no_revalidate:
1064 /* Only return attributes that were revalidated. */
1065 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
1066
1067 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1068 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
1069 stat->change_cookie = inode_peek_iversion_raw(inode);
1070 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
1071 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
1072 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
1073 if (S_ISDIR(inode->i_mode))
1074 stat->blksize = NFS_SERVER(inode)->dtsize;
1075 stat->btime = NFS_I(inode)->btime;
1076 out:
1077 trace_nfs_getattr_exit(inode, err);
1078 return err;
1079 }
1080 EXPORT_SYMBOL_GPL(nfs_getattr);
1081
nfs_init_lock_context(struct nfs_lock_context * l_ctx)1082 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
1083 {
1084 refcount_set(&l_ctx->count, 1);
1085 l_ctx->lockowner = current->files;
1086 INIT_LIST_HEAD(&l_ctx->list);
1087 atomic_set(&l_ctx->io_count, 0);
1088 }
1089
__nfs_find_lock_context(struct nfs_open_context * ctx)1090 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
1091 {
1092 struct nfs_lock_context *pos;
1093
1094 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
1095 if (pos->lockowner != current->files)
1096 continue;
1097 if (refcount_inc_not_zero(&pos->count))
1098 return pos;
1099 }
1100 return NULL;
1101 }
1102
nfs_get_lock_context(struct nfs_open_context * ctx)1103 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
1104 {
1105 struct nfs_lock_context *res, *new = NULL;
1106 struct inode *inode = d_inode(ctx->dentry);
1107
1108 rcu_read_lock();
1109 res = __nfs_find_lock_context(ctx);
1110 rcu_read_unlock();
1111 if (res == NULL) {
1112 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
1113 if (new == NULL)
1114 return ERR_PTR(-ENOMEM);
1115 nfs_init_lock_context(new);
1116 spin_lock(&inode->i_lock);
1117 res = __nfs_find_lock_context(ctx);
1118 if (res == NULL) {
1119 new->open_context = get_nfs_open_context(ctx);
1120 if (new->open_context) {
1121 list_add_tail_rcu(&new->list,
1122 &ctx->lock_context.list);
1123 res = new;
1124 new = NULL;
1125 } else
1126 res = ERR_PTR(-EBADF);
1127 }
1128 spin_unlock(&inode->i_lock);
1129 kfree(new);
1130 }
1131 return res;
1132 }
1133 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
1134
nfs_put_lock_context(struct nfs_lock_context * l_ctx)1135 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
1136 {
1137 struct nfs_open_context *ctx = l_ctx->open_context;
1138 struct inode *inode = d_inode(ctx->dentry);
1139
1140 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
1141 return;
1142 list_del_rcu(&l_ctx->list);
1143 spin_unlock(&inode->i_lock);
1144 put_nfs_open_context(ctx);
1145 kfree_rcu(l_ctx, rcu_head);
1146 }
1147 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
1148
1149 /**
1150 * nfs_close_context - Common close_context() routine NFSv2/v3
1151 * @ctx: pointer to context
1152 * @is_sync: is this a synchronous close
1153 *
1154 * Ensure that the attributes are up to date if we're mounted
1155 * with close-to-open semantics and we have cached data that will
1156 * need to be revalidated on open.
1157 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1158 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1159 {
1160 struct nfs_inode *nfsi;
1161 struct inode *inode;
1162
1163 if (!(ctx->mode & FMODE_WRITE))
1164 return;
1165 if (!is_sync)
1166 return;
1167 inode = d_inode(ctx->dentry);
1168 if (nfs_have_read_or_write_delegation(inode))
1169 return;
1170 nfsi = NFS_I(inode);
1171 if (inode->i_mapping->nrpages == 0)
1172 return;
1173 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1174 return;
1175 if (!list_empty(&nfsi->open_files))
1176 return;
1177 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1178 return;
1179 nfs_revalidate_inode(inode,
1180 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1181 }
1182 EXPORT_SYMBOL_GPL(nfs_close_context);
1183
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1184 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1185 fmode_t f_mode,
1186 struct file *filp)
1187 {
1188 struct nfs_open_context *ctx;
1189
1190 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1191 if (!ctx)
1192 return ERR_PTR(-ENOMEM);
1193 nfs_sb_active(dentry->d_sb);
1194 ctx->dentry = dget(dentry);
1195 if (filp)
1196 ctx->cred = get_cred(filp->f_cred);
1197 else
1198 ctx->cred = get_current_cred();
1199 rcu_assign_pointer(ctx->ll_cred, NULL);
1200 ctx->state = NULL;
1201 ctx->mode = f_mode;
1202 ctx->flags = 0;
1203 ctx->error = 0;
1204 ctx->flock_owner = (fl_owner_t)filp;
1205 nfs_init_lock_context(&ctx->lock_context);
1206 ctx->lock_context.open_context = ctx;
1207 INIT_LIST_HEAD(&ctx->list);
1208 ctx->mdsthreshold = NULL;
1209 nfs_localio_file_init(&ctx->nfl);
1210
1211 return ctx;
1212 }
1213 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1214
get_nfs_open_context(struct nfs_open_context * ctx)1215 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1216 {
1217 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1218 return ctx;
1219 return NULL;
1220 }
1221 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1222
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1223 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1224 {
1225 struct inode *inode = d_inode(ctx->dentry);
1226 struct super_block *sb = ctx->dentry->d_sb;
1227
1228 if (!refcount_dec_and_test(&ctx->lock_context.count))
1229 return;
1230 if (!list_empty(&ctx->list)) {
1231 spin_lock(&inode->i_lock);
1232 list_del_rcu(&ctx->list);
1233 spin_unlock(&inode->i_lock);
1234 }
1235 if (inode != NULL)
1236 NFS_PROTO(inode)->close_context(ctx, is_sync);
1237 put_cred(ctx->cred);
1238 dput(ctx->dentry);
1239 nfs_sb_deactive(sb);
1240 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1241 kfree(ctx->mdsthreshold);
1242 nfs_close_local_fh(&ctx->nfl);
1243 kfree_rcu(ctx, rcu_head);
1244 }
1245
put_nfs_open_context(struct nfs_open_context * ctx)1246 void put_nfs_open_context(struct nfs_open_context *ctx)
1247 {
1248 __put_nfs_open_context(ctx, 0);
1249 }
1250 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1251
put_nfs_open_context_sync(struct nfs_open_context * ctx)1252 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1253 {
1254 __put_nfs_open_context(ctx, 1);
1255 }
1256
1257 /*
1258 * Ensure that mmap has a recent RPC credential for use when writing out
1259 * shared pages
1260 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1261 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1262 {
1263 struct inode *inode = d_inode(ctx->dentry);
1264 struct nfs_inode *nfsi = NFS_I(inode);
1265
1266 spin_lock(&inode->i_lock);
1267 if (list_empty(&nfsi->open_files) &&
1268 nfs_ooo_test(nfsi))
1269 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1270 NFS_INO_REVAL_FORCED);
1271 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1272 spin_unlock(&inode->i_lock);
1273 }
1274 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1275
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1276 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1277 {
1278 filp->private_data = get_nfs_open_context(ctx);
1279 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1280 if (list_empty(&ctx->list))
1281 nfs_inode_attach_open_context(ctx);
1282 }
1283 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1284
1285 /*
1286 * Given an inode, search for an open context with the desired characteristics
1287 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1288 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1289 {
1290 struct nfs_inode *nfsi = NFS_I(inode);
1291 struct nfs_open_context *pos, *ctx = NULL;
1292
1293 rcu_read_lock();
1294 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1295 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1296 continue;
1297 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1298 continue;
1299 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1300 continue;
1301 ctx = get_nfs_open_context(pos);
1302 if (ctx)
1303 break;
1304 }
1305 rcu_read_unlock();
1306 return ctx;
1307 }
1308
nfs_file_clear_open_context(struct file * filp)1309 void nfs_file_clear_open_context(struct file *filp)
1310 {
1311 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1312
1313 if (ctx) {
1314 struct inode *inode = d_inode(ctx->dentry);
1315
1316 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1317 /*
1318 * We fatal error on write before. Try to writeback
1319 * every page again.
1320 */
1321 if (ctx->error < 0)
1322 invalidate_inode_pages2(inode->i_mapping);
1323 filp->private_data = NULL;
1324 put_nfs_open_context_sync(ctx);
1325 }
1326 }
1327
1328 /*
1329 * These allocate and release file read/write context information.
1330 */
nfs_open(struct inode * inode,struct file * filp)1331 int nfs_open(struct inode *inode, struct file *filp)
1332 {
1333 struct nfs_open_context *ctx;
1334
1335 ctx = alloc_nfs_open_context(file_dentry(filp),
1336 flags_to_mode(filp->f_flags), filp);
1337 if (IS_ERR(ctx))
1338 return PTR_ERR(ctx);
1339 nfs_file_set_open_context(filp, ctx);
1340 put_nfs_open_context(ctx);
1341 nfs_fscache_open_file(inode, filp);
1342 return 0;
1343 }
1344
1345 /*
1346 * This function is called whenever some part of NFS notices that
1347 * the cached attributes have to be refreshed.
1348 */
1349 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1350 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1351 {
1352 int status = -ESTALE;
1353 struct nfs_fattr *fattr = NULL;
1354 struct nfs_inode *nfsi = NFS_I(inode);
1355
1356 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1357 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1358
1359 trace_nfs_revalidate_inode_enter(inode);
1360
1361 if (is_bad_inode(inode))
1362 goto out;
1363 if (NFS_STALE(inode))
1364 goto out;
1365
1366 /* pNFS: Attributes aren't updated until we layoutcommit */
1367 if (S_ISREG(inode->i_mode)) {
1368 status = pnfs_sync_inode(inode, false);
1369 if (status)
1370 goto out;
1371 }
1372
1373 status = -ENOMEM;
1374 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1375 if (fattr == NULL)
1376 goto out;
1377
1378 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1379
1380 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1381 if (status != 0) {
1382 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1383 inode->i_sb->s_id,
1384 (unsigned long long)NFS_FILEID(inode), status);
1385 switch (status) {
1386 case -ETIMEDOUT:
1387 /* A soft timeout occurred. Use cached information? */
1388 if (server->flags & NFS_MOUNT_SOFTREVAL)
1389 status = 0;
1390 break;
1391 case -ESTALE:
1392 if (!S_ISDIR(inode->i_mode))
1393 nfs_set_inode_stale(inode);
1394 else
1395 nfs_zap_caches(inode);
1396 }
1397 goto out;
1398 }
1399
1400 status = nfs_refresh_inode(inode, fattr);
1401 if (status) {
1402 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1403 inode->i_sb->s_id,
1404 (unsigned long long)NFS_FILEID(inode), status);
1405 goto out;
1406 }
1407
1408 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1409 nfs_zap_acl_cache(inode);
1410
1411 nfs_setsecurity(inode, fattr);
1412
1413 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1414 inode->i_sb->s_id,
1415 (unsigned long long)NFS_FILEID(inode));
1416
1417 out:
1418 nfs_free_fattr(fattr);
1419 trace_nfs_revalidate_inode_exit(inode, status);
1420 return status;
1421 }
1422
nfs_attribute_cache_expired(struct inode * inode)1423 int nfs_attribute_cache_expired(struct inode *inode)
1424 {
1425 if (nfs_have_delegated_attributes(inode))
1426 return 0;
1427 return nfs_attribute_timeout(inode);
1428 }
1429
1430 /**
1431 * nfs_revalidate_inode - Revalidate the inode attributes
1432 * @inode: pointer to inode struct
1433 * @flags: cache flags to check
1434 *
1435 * Updates inode attribute information by retrieving the data from the server.
1436 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1437 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1438 {
1439 if (!nfs_check_cache_invalid(inode, flags))
1440 return NFS_STALE(inode) ? -ESTALE : 0;
1441 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1442 }
1443 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1444
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1445 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1446 {
1447 int ret;
1448
1449 nfs_fscache_invalidate(inode, 0);
1450 if (mapping->nrpages != 0) {
1451 if (S_ISREG(inode->i_mode)) {
1452 ret = nfs_sync_mapping(mapping);
1453 if (ret < 0)
1454 return ret;
1455 }
1456 ret = invalidate_inode_pages2(mapping);
1457 if (ret < 0)
1458 return ret;
1459 }
1460 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1461
1462 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1463 inode->i_sb->s_id,
1464 (unsigned long long)NFS_FILEID(inode));
1465 return 0;
1466 }
1467
1468 /**
1469 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1470 * @mapping: pointer to mapping
1471 *
1472 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1473 */
nfs_clear_invalid_mapping(struct address_space * mapping)1474 int nfs_clear_invalid_mapping(struct address_space *mapping)
1475 {
1476 struct inode *inode = mapping->host;
1477 struct nfs_inode *nfsi = NFS_I(inode);
1478 unsigned long *bitlock = &nfsi->flags;
1479 int ret = 0;
1480
1481 /*
1482 * We must clear NFS_INO_INVALID_DATA first to ensure that
1483 * invalidations that come in while we're shooting down the mappings
1484 * are respected. But, that leaves a race window where one revalidator
1485 * can clear the flag, and then another checks it before the mapping
1486 * gets invalidated. Fix that by serializing access to this part of
1487 * the function.
1488 *
1489 * At the same time, we need to allow other tasks to see whether we
1490 * might be in the middle of invalidating the pages, so we only set
1491 * the bit lock here if it looks like we're going to be doing that.
1492 */
1493 for (;;) {
1494 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1495 nfs_wait_bit_killable,
1496 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1497 if (ret)
1498 goto out;
1499 smp_rmb(); /* pairs with smp_wmb() below */
1500 if (test_bit(NFS_INO_INVALIDATING, bitlock))
1501 continue;
1502 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */
1503 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA))
1504 goto out;
1505 /* Slow-path that double-checks with spinlock held */
1506 spin_lock(&inode->i_lock);
1507 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1508 spin_unlock(&inode->i_lock);
1509 continue;
1510 }
1511 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1512 break;
1513 spin_unlock(&inode->i_lock);
1514 goto out;
1515 }
1516
1517 set_bit(NFS_INO_INVALIDATING, bitlock);
1518 smp_wmb();
1519 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1520 nfs_ooo_clear(nfsi);
1521 spin_unlock(&inode->i_lock);
1522 trace_nfs_invalidate_mapping_enter(inode);
1523 ret = nfs_invalidate_mapping(inode, mapping);
1524 trace_nfs_invalidate_mapping_exit(inode, ret);
1525
1526 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1527 smp_mb__after_atomic();
1528 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1529 out:
1530 return ret;
1531 }
1532
nfs_mapping_need_revalidate_inode(struct inode * inode)1533 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1534 {
1535 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1536 NFS_STALE(inode);
1537 }
1538
nfs_revalidate_mapping_rcu(struct inode * inode)1539 int nfs_revalidate_mapping_rcu(struct inode *inode)
1540 {
1541 struct nfs_inode *nfsi = NFS_I(inode);
1542 unsigned long *bitlock = &nfsi->flags;
1543 int ret = 0;
1544
1545 if (IS_SWAPFILE(inode))
1546 goto out;
1547 if (nfs_mapping_need_revalidate_inode(inode)) {
1548 ret = -ECHILD;
1549 goto out;
1550 }
1551 spin_lock(&inode->i_lock);
1552 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1553 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1554 ret = -ECHILD;
1555 spin_unlock(&inode->i_lock);
1556 out:
1557 return ret;
1558 }
1559
1560 /**
1561 * nfs_revalidate_mapping - Revalidate the pagecache
1562 * @inode: pointer to host inode
1563 * @mapping: pointer to mapping
1564 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1565 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1566 {
1567 /* swapfiles are not supposed to be shared. */
1568 if (IS_SWAPFILE(inode))
1569 return 0;
1570
1571 if (nfs_mapping_need_revalidate_inode(inode)) {
1572 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1573 if (ret < 0)
1574 return ret;
1575 }
1576
1577 return nfs_clear_invalid_mapping(mapping);
1578 }
1579
nfs_file_has_writers(struct nfs_inode * nfsi)1580 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1581 {
1582 struct inode *inode = &nfsi->vfs_inode;
1583
1584 if (!S_ISREG(inode->i_mode))
1585 return false;
1586 if (list_empty(&nfsi->open_files))
1587 return false;
1588 return inode_is_open_for_write(inode);
1589 }
1590
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1591 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1592 {
1593 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1594 }
1595
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1596 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1597 {
1598 struct timespec64 ts;
1599
1600 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1601 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1602 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1603 inode_set_iversion_raw(inode, fattr->change_attr);
1604 if (S_ISDIR(inode->i_mode))
1605 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1606 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1607 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1608 }
1609 /* If we have atomic WCC data, we may update some attributes */
1610 ts = inode_get_ctime(inode);
1611 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1612 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1613 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1614 inode_set_ctime_to_ts(inode, fattr->ctime);
1615 }
1616
1617 ts = inode_get_mtime(inode);
1618 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1619 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1620 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1621 inode_set_mtime_to_ts(inode, fattr->mtime);
1622 }
1623 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1624 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1625 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1626 && !nfs_have_writebacks(inode)) {
1627 trace_nfs_size_wcc(inode, fattr->size);
1628 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1629 }
1630 }
1631
1632 /**
1633 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1634 * @inode: pointer to inode
1635 * @fattr: updated attributes
1636 *
1637 * Verifies the attribute cache. If we have just changed the attributes,
1638 * so that fattr carries weak cache consistency data, then it may
1639 * also update the ctime/mtime/change_attribute.
1640 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1641 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1642 {
1643 struct nfs_inode *nfsi = NFS_I(inode);
1644 loff_t cur_size, new_isize;
1645 unsigned long invalid = 0;
1646 struct timespec64 ts;
1647
1648 if (nfs_have_delegated_attributes(inode))
1649 return 0;
1650
1651 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1652 /* Only a mounted-on-fileid? Just exit */
1653 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1654 return 0;
1655 /* Has the inode gone and changed behind our back? */
1656 } else if (nfsi->fileid != fattr->fileid) {
1657 /* Is this perhaps the mounted-on fileid? */
1658 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1659 nfsi->fileid == fattr->mounted_on_fileid)
1660 return 0;
1661 return -ESTALE;
1662 }
1663 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1664 return -ESTALE;
1665
1666
1667 if (!nfs_file_has_buffered_writers(nfsi)) {
1668 /* Verify a few of the more important attributes */
1669 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1670 invalid |= NFS_INO_INVALID_CHANGE;
1671
1672 ts = inode_get_mtime(inode);
1673 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1674 invalid |= NFS_INO_INVALID_MTIME;
1675
1676 ts = inode_get_ctime(inode);
1677 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1678 invalid |= NFS_INO_INVALID_CTIME;
1679
1680 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1681 cur_size = i_size_read(inode);
1682 new_isize = nfs_size_to_loff_t(fattr->size);
1683 if (cur_size != new_isize)
1684 invalid |= NFS_INO_INVALID_SIZE;
1685 }
1686 }
1687
1688 /* Have any file permissions changed? */
1689 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1690 invalid |= NFS_INO_INVALID_MODE;
1691 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1692 invalid |= NFS_INO_INVALID_OTHER;
1693 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1694 invalid |= NFS_INO_INVALID_OTHER;
1695
1696 /* Has the link count changed? */
1697 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1698 invalid |= NFS_INO_INVALID_NLINK;
1699
1700 ts = inode_get_atime(inode);
1701 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1702 invalid |= NFS_INO_INVALID_ATIME;
1703
1704 if (invalid != 0)
1705 nfs_set_cache_invalid(inode, invalid);
1706
1707 nfsi->read_cache_jiffies = fattr->time_start;
1708 return 0;
1709 }
1710
1711 static atomic_long_t nfs_attr_generation_counter;
1712
nfs_read_attr_generation_counter(void)1713 static unsigned long nfs_read_attr_generation_counter(void)
1714 {
1715 return atomic_long_read(&nfs_attr_generation_counter);
1716 }
1717
nfs_inc_attr_generation_counter(void)1718 unsigned long nfs_inc_attr_generation_counter(void)
1719 {
1720 return atomic_long_inc_return(&nfs_attr_generation_counter);
1721 }
1722 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1723
nfs_fattr_init(struct nfs_fattr * fattr)1724 void nfs_fattr_init(struct nfs_fattr *fattr)
1725 {
1726 fattr->valid = 0;
1727 fattr->time_start = jiffies;
1728 fattr->gencount = nfs_inc_attr_generation_counter();
1729 fattr->owner_name = NULL;
1730 fattr->group_name = NULL;
1731 fattr->mdsthreshold = NULL;
1732 }
1733 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1734
1735 /**
1736 * nfs_fattr_set_barrier
1737 * @fattr: attributes
1738 *
1739 * Used to set a barrier after an attribute was updated. This
1740 * barrier ensures that older attributes from RPC calls that may
1741 * have raced with our update cannot clobber these new values.
1742 * Note that you are still responsible for ensuring that other
1743 * operations which change the attribute on the server do not
1744 * collide.
1745 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1746 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1747 {
1748 fattr->gencount = nfs_inc_attr_generation_counter();
1749 }
1750
nfs_alloc_fattr(void)1751 struct nfs_fattr *nfs_alloc_fattr(void)
1752 {
1753 struct nfs_fattr *fattr;
1754
1755 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1756 if (fattr != NULL) {
1757 nfs_fattr_init(fattr);
1758 fattr->label = NULL;
1759 }
1760 return fattr;
1761 }
1762 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1763
nfs_alloc_fattr_with_label(struct nfs_server * server)1764 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1765 {
1766 struct nfs_fattr *fattr = nfs_alloc_fattr();
1767
1768 if (!fattr)
1769 return NULL;
1770
1771 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1772 if (IS_ERR(fattr->label)) {
1773 kfree(fattr);
1774 return NULL;
1775 }
1776
1777 return fattr;
1778 }
1779 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1780
nfs_alloc_fhandle(void)1781 struct nfs_fh *nfs_alloc_fhandle(void)
1782 {
1783 struct nfs_fh *fh;
1784
1785 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1786 if (fh != NULL)
1787 fh->size = 0;
1788 return fh;
1789 }
1790 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1791
1792 #ifdef NFS_DEBUG
1793 /*
1794 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1795 * in the same way that wireshark does
1796 *
1797 * @fh: file handle
1798 *
1799 * For debugging only.
1800 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1801 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1802 {
1803 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1804 * not on the result */
1805 return nfs_fhandle_hash(fh);
1806 }
1807 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1808
1809 /*
1810 * _nfs_display_fhandle - display an NFS file handle on the console
1811 *
1812 * @fh: file handle to display
1813 * @caption: display caption
1814 *
1815 * For debugging only.
1816 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1817 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1818 {
1819 unsigned short i;
1820
1821 if (fh == NULL || fh->size == 0) {
1822 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1823 return;
1824 }
1825
1826 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1827 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1828 for (i = 0; i < fh->size; i += 16) {
1829 __be32 *pos = (__be32 *)&fh->data[i];
1830
1831 switch ((fh->size - i - 1) >> 2) {
1832 case 0:
1833 printk(KERN_DEFAULT " %08x\n",
1834 be32_to_cpup(pos));
1835 break;
1836 case 1:
1837 printk(KERN_DEFAULT " %08x %08x\n",
1838 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1839 break;
1840 case 2:
1841 printk(KERN_DEFAULT " %08x %08x %08x\n",
1842 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1843 be32_to_cpup(pos + 2));
1844 break;
1845 default:
1846 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1847 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1848 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1849 }
1850 }
1851 }
1852 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1853 #endif
1854
1855 /**
1856 * nfs_inode_attrs_cmp_generic - compare attributes
1857 * @fattr: attributes
1858 * @inode: pointer to inode
1859 *
1860 * Attempt to divine whether or not an RPC call reply carrying stale
1861 * attributes got scheduled after another call carrying updated ones.
1862 * Note also the check for wraparound of 'attr_gencount'
1863 *
1864 * The function returns '1' if it thinks the attributes in @fattr are
1865 * more recent than the ones cached in @inode. Otherwise it returns
1866 * the value '0'.
1867 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1868 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1869 const struct inode *inode)
1870 {
1871 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1872
1873 return (long)(fattr->gencount - attr_gencount) > 0 ||
1874 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1875 }
1876
1877 /**
1878 * nfs_inode_attrs_cmp_monotonic - compare attributes
1879 * @fattr: attributes
1880 * @inode: pointer to inode
1881 *
1882 * Attempt to divine whether or not an RPC call reply carrying stale
1883 * attributes got scheduled after another call carrying updated ones.
1884 *
1885 * We assume that the server observes monotonic semantics for
1886 * the change attribute, so a larger value means that the attributes in
1887 * @fattr are more recent, in which case the function returns the
1888 * value '1'.
1889 * A return value of '0' indicates no measurable change
1890 * A return value of '-1' means that the attributes in @inode are
1891 * more recent.
1892 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1893 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1894 const struct inode *inode)
1895 {
1896 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1897 if (diff > 0)
1898 return 1;
1899 return diff == 0 ? 0 : -1;
1900 }
1901
1902 /**
1903 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1904 * @fattr: attributes
1905 * @inode: pointer to inode
1906 *
1907 * Attempt to divine whether or not an RPC call reply carrying stale
1908 * attributes got scheduled after another call carrying updated ones.
1909 *
1910 * We assume that the server observes strictly monotonic semantics for
1911 * the change attribute, so a larger value means that the attributes in
1912 * @fattr are more recent, in which case the function returns the
1913 * value '1'.
1914 * A return value of '-1' means that the attributes in @inode are
1915 * more recent or unchanged.
1916 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1917 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1918 const struct inode *inode)
1919 {
1920 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1921 }
1922
1923 /**
1924 * nfs_inode_attrs_cmp - compare attributes
1925 * @fattr: attributes
1926 * @inode: pointer to inode
1927 *
1928 * This function returns '1' if it thinks the attributes in @fattr are
1929 * more recent than the ones cached in @inode. It returns '-1' if
1930 * the attributes in @inode are more recent than the ones in @fattr,
1931 * and it returns 0 if not sure.
1932 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1933 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1934 const struct inode *inode)
1935 {
1936 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1937 return 1;
1938 switch (NFS_SERVER(inode)->change_attr_type) {
1939 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1940 break;
1941 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1942 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1943 break;
1944 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1945 default:
1946 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1947 break;
1948 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1949 }
1950 return 0;
1951 }
1952
1953 /**
1954 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1955 * @fattr: attributes
1956 * @inode: pointer to inode
1957 *
1958 * Returns '1' if the last attribute update left the inode cached
1959 * attributes in a partially unrevalidated state, and @fattr
1960 * matches the change attribute of that partial update.
1961 * Otherwise returns '0'.
1962 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1963 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1964 const struct inode *inode)
1965 {
1966 const unsigned long check_valid =
1967 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1968 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1969 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1970 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME;
1971 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1972 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1973
1974 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1975 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
1976 (cache_validity & check_valid) != 0 &&
1977 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1978 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1979 return 1;
1980 return 0;
1981 }
1982
nfs_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)1983 static void nfs_ooo_merge(struct nfs_inode *nfsi,
1984 u64 start, u64 end)
1985 {
1986 int i, cnt;
1987
1988 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
1989 /* No point merging anything */
1990 return;
1991
1992 if (!nfsi->ooo) {
1993 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
1994 if (!nfsi->ooo) {
1995 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1996 return;
1997 }
1998 nfsi->ooo->cnt = 0;
1999 }
2000
2001 /* add this range, merging if possible */
2002 cnt = nfsi->ooo->cnt;
2003 for (i = 0; i < cnt; i++) {
2004 if (end == nfsi->ooo->gap[i].start)
2005 end = nfsi->ooo->gap[i].end;
2006 else if (start == nfsi->ooo->gap[i].end)
2007 start = nfsi->ooo->gap[i].start;
2008 else
2009 continue;
2010 /* Remove 'i' from table and loop to insert the new range */
2011 cnt -= 1;
2012 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
2013 i = -1;
2014 }
2015 if (start != end) {
2016 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
2017 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2018 kfree(nfsi->ooo);
2019 nfsi->ooo = NULL;
2020 return;
2021 }
2022 nfsi->ooo->gap[cnt].start = start;
2023 nfsi->ooo->gap[cnt].end = end;
2024 cnt += 1;
2025 }
2026 nfsi->ooo->cnt = cnt;
2027 }
2028
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)2029 static void nfs_ooo_record(struct nfs_inode *nfsi,
2030 struct nfs_fattr *fattr)
2031 {
2032 /* This reply was out-of-order, so record in the
2033 * pre/post change id, possibly cancelling
2034 * gaps created when iversion was jumpped forward.
2035 */
2036 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
2037 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
2038 nfs_ooo_merge(nfsi,
2039 fattr->change_attr,
2040 fattr->pre_change_attr);
2041 }
2042
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)2043 static int nfs_refresh_inode_locked(struct inode *inode,
2044 struct nfs_fattr *fattr)
2045 {
2046 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2047 int ret = 0;
2048
2049 trace_nfs_refresh_inode_enter(inode);
2050
2051 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
2052 ret = nfs_update_inode(inode, fattr);
2053 else {
2054 nfs_ooo_record(NFS_I(inode), fattr);
2055
2056 if (attr_cmp == 0)
2057 ret = nfs_check_inode_attributes(inode, fattr);
2058 }
2059
2060 trace_nfs_refresh_inode_exit(inode, ret);
2061 return ret;
2062 }
2063
2064 /**
2065 * nfs_refresh_inode - try to update the inode attribute cache
2066 * @inode: pointer to inode
2067 * @fattr: updated attributes
2068 *
2069 * Check that an RPC call that returned attributes has not overlapped with
2070 * other recent updates of the inode metadata, then decide whether it is
2071 * safe to do a full update of the inode attributes, or whether just to
2072 * call nfs_check_inode_attributes.
2073 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)2074 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
2075 {
2076 int status;
2077
2078 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2079 return 0;
2080 spin_lock(&inode->i_lock);
2081 status = nfs_refresh_inode_locked(inode, fattr);
2082 spin_unlock(&inode->i_lock);
2083
2084 return status;
2085 }
2086 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
2087
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)2088 static int nfs_post_op_update_inode_locked(struct inode *inode,
2089 struct nfs_fattr *fattr, unsigned int invalid)
2090 {
2091 if (S_ISDIR(inode->i_mode))
2092 invalid |= NFS_INO_INVALID_DATA;
2093 nfs_set_cache_invalid(inode, invalid);
2094 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2095 return 0;
2096 return nfs_refresh_inode_locked(inode, fattr);
2097 }
2098
2099 /**
2100 * nfs_post_op_update_inode - try to update the inode attribute cache
2101 * @inode: pointer to inode
2102 * @fattr: updated attributes
2103 *
2104 * After an operation that has changed the inode metadata, mark the
2105 * attribute cache as being invalid, then try to update it.
2106 *
2107 * NB: if the server didn't return any post op attributes, this
2108 * function will force the retrieval of attributes before the next
2109 * NFS request. Thus it should be used only for operations that
2110 * are expected to change one or more attributes, to avoid
2111 * unnecessary NFS requests and trips through nfs_update_inode().
2112 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)2113 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2114 {
2115 int status;
2116
2117 spin_lock(&inode->i_lock);
2118 nfs_fattr_set_barrier(fattr);
2119 status = nfs_post_op_update_inode_locked(inode, fattr,
2120 NFS_INO_INVALID_CHANGE
2121 | NFS_INO_INVALID_CTIME
2122 | NFS_INO_REVAL_FORCED);
2123 spin_unlock(&inode->i_lock);
2124
2125 return status;
2126 }
2127 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
2128
2129 /**
2130 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
2131 * @inode: pointer to inode
2132 * @fattr: updated attributes
2133 *
2134 * After an operation that has changed the inode metadata, mark the
2135 * attribute cache as being invalid, then try to update it. Fake up
2136 * weak cache consistency data, if none exist.
2137 *
2138 * This function is mainly designed to be used by the ->write_done() functions.
2139 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)2140 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
2141 {
2142 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2143 int status;
2144
2145 /* Don't do a WCC update if these attributes are already stale */
2146 if (attr_cmp < 0)
2147 return 0;
2148 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
2149 /* Record the pre/post change info before clearing PRECHANGE */
2150 nfs_ooo_record(NFS_I(inode), fattr);
2151 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
2152 | NFS_ATTR_FATTR_PRESIZE
2153 | NFS_ATTR_FATTR_PREMTIME
2154 | NFS_ATTR_FATTR_PRECTIME);
2155 goto out_noforce;
2156 }
2157 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2158 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
2159 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
2160 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
2161 }
2162 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
2163 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2164 fattr->pre_ctime = inode_get_ctime(inode);
2165 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2166 }
2167 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2168 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2169 fattr->pre_mtime = inode_get_mtime(inode);
2170 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2171 }
2172 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2173 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2174 fattr->pre_size = i_size_read(inode);
2175 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2176 }
2177 out_noforce:
2178 status = nfs_post_op_update_inode_locked(inode, fattr,
2179 NFS_INO_INVALID_CHANGE
2180 | NFS_INO_INVALID_CTIME
2181 | NFS_INO_INVALID_MTIME
2182 | NFS_INO_INVALID_BLOCKS);
2183 return status;
2184 }
2185
2186 /**
2187 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2188 * @inode: pointer to inode
2189 * @fattr: updated attributes
2190 *
2191 * After an operation that has changed the inode metadata, mark the
2192 * attribute cache as being invalid, then try to update it. Fake up
2193 * weak cache consistency data, if none exist.
2194 *
2195 * This function is mainly designed to be used by the ->write_done() functions.
2196 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2197 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2198 {
2199 int status;
2200
2201 spin_lock(&inode->i_lock);
2202 nfs_fattr_set_barrier(fattr);
2203 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2204 spin_unlock(&inode->i_lock);
2205 return status;
2206 }
2207 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2208
2209
2210 /*
2211 * Many nfs protocol calls return the new file attributes after
2212 * an operation. Here we update the inode to reflect the state
2213 * of the server's inode.
2214 *
2215 * This is a bit tricky because we have to make sure all dirty pages
2216 * have been sent off to the server before calling invalidate_inode_pages.
2217 * To make sure no other process adds more write requests while we try
2218 * our best to flush them, we make them sleep during the attribute refresh.
2219 *
2220 * A very similar scenario holds for the dir cache.
2221 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2222 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2223 {
2224 struct nfs_server *server = NFS_SERVER(inode);
2225 struct nfs_inode *nfsi = NFS_I(inode);
2226 loff_t cur_isize, new_isize;
2227 u64 fattr_supported = server->fattr_valid;
2228 unsigned long invalid = 0;
2229 unsigned long now = jiffies;
2230 unsigned long save_cache_validity;
2231 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2232 bool cache_revalidated = true;
2233 bool attr_changed = false;
2234 bool have_delegation;
2235
2236 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%llx)\n",
2237 __func__, inode->i_sb->s_id, inode->i_ino,
2238 nfs_display_fhandle_hash(NFS_FH(inode)),
2239 atomic_read(&inode->i_count), fattr->valid);
2240
2241 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2242 /* Only a mounted-on-fileid? Just exit */
2243 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2244 return 0;
2245 /* Has the inode gone and changed behind our back? */
2246 } else if (nfsi->fileid != fattr->fileid) {
2247 /* Is this perhaps the mounted-on fileid? */
2248 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2249 nfsi->fileid == fattr->mounted_on_fileid)
2250 return 0;
2251 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2252 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2253 NFS_SERVER(inode)->nfs_client->cl_hostname,
2254 inode->i_sb->s_id, (long long)nfsi->fileid,
2255 (long long)fattr->fileid);
2256 goto out_err;
2257 }
2258
2259 /*
2260 * Make sure the inode's type hasn't changed.
2261 */
2262 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2263 /*
2264 * Big trouble! The inode has become a different object.
2265 */
2266 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2267 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2268 goto out_err;
2269 }
2270
2271 /* Update the fsid? */
2272 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2273 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2274 !IS_AUTOMOUNT(inode))
2275 server->fsid = fattr->fsid;
2276
2277 /* Save the delegation state before clearing cache_validity */
2278 have_delegation = nfs_have_delegated_attributes(inode);
2279
2280 /*
2281 * Update the read time so we don't revalidate too often.
2282 */
2283 nfsi->read_cache_jiffies = fattr->time_start;
2284
2285 /* Fix up any delegated attributes in the struct nfs_fattr */
2286 nfs_fattr_fixup_delegated(inode, fattr);
2287
2288 save_cache_validity = nfsi->cache_validity;
2289 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2290 | NFS_INO_INVALID_ATIME
2291 | NFS_INO_REVAL_FORCED
2292 | NFS_INO_INVALID_BLOCKS);
2293
2294 /* Do atomic weak cache consistency updates */
2295 nfs_wcc_update_inode(inode, fattr);
2296
2297 if (pnfs_layoutcommit_outstanding(inode)) {
2298 nfsi->cache_validity |=
2299 save_cache_validity &
2300 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2301 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2302 NFS_INO_INVALID_BLOCKS);
2303 cache_revalidated = false;
2304 }
2305
2306 /* More cache consistency checks */
2307 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2308 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2309 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2310 /* There is one remaining gap that hasn't been
2311 * merged into iversion - do that now.
2312 */
2313 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2314 kfree(nfsi->ooo);
2315 nfsi->ooo = NULL;
2316 }
2317 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2318 /* Could it be a race with writeback? */
2319 if (!(have_writers || have_delegation)) {
2320 invalid |= NFS_INO_INVALID_DATA
2321 | NFS_INO_INVALID_ACCESS
2322 | NFS_INO_INVALID_ACL
2323 | NFS_INO_INVALID_XATTR;
2324 /* Force revalidate of all attributes */
2325 save_cache_validity |= NFS_INO_INVALID_CTIME
2326 | NFS_INO_INVALID_MTIME
2327 | NFS_INO_INVALID_SIZE
2328 | NFS_INO_INVALID_BLOCKS
2329 | NFS_INO_INVALID_NLINK
2330 | NFS_INO_INVALID_MODE
2331 | NFS_INO_INVALID_OTHER
2332 | NFS_INO_INVALID_BTIME;
2333 if (S_ISDIR(inode->i_mode))
2334 nfs_force_lookup_revalidate(inode);
2335 attr_changed = true;
2336 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2337 inode->i_sb->s_id,
2338 inode->i_ino);
2339 } else if (!have_delegation) {
2340 nfs_ooo_record(nfsi, fattr);
2341 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2342 fattr->change_attr);
2343 }
2344 inode_set_iversion_raw(inode, fattr->change_attr);
2345 }
2346 } else {
2347 nfsi->cache_validity |=
2348 save_cache_validity & NFS_INO_INVALID_CHANGE;
2349 if (!have_delegation ||
2350 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2351 cache_revalidated = false;
2352 }
2353
2354 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2355 inode_set_mtime_to_ts(inode, fattr->mtime);
2356 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2357 nfsi->cache_validity |=
2358 save_cache_validity & NFS_INO_INVALID_MTIME;
2359
2360 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2361 inode_set_ctime_to_ts(inode, fattr->ctime);
2362 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2363 nfsi->cache_validity |=
2364 save_cache_validity & NFS_INO_INVALID_CTIME;
2365
2366 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
2367 nfsi->btime = fattr->btime;
2368 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
2369 nfsi->cache_validity |=
2370 save_cache_validity & NFS_INO_INVALID_BTIME;
2371
2372 /* Check if our cached file size is stale */
2373 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2374 new_isize = nfs_size_to_loff_t(fattr->size);
2375 cur_isize = i_size_read(inode);
2376 if (new_isize != cur_isize && !have_delegation) {
2377 /* Do we perhaps have any outstanding writes, or has
2378 * the file grown beyond our last write? */
2379 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2380 trace_nfs_size_update(inode, new_isize);
2381 i_size_write(inode, new_isize);
2382 if (!have_writers)
2383 invalid |= NFS_INO_INVALID_DATA;
2384 }
2385 }
2386 if (new_isize == 0 &&
2387 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2388 NFS_ATTR_FATTR_BLOCKS_USED))) {
2389 fattr->du.nfs3.used = 0;
2390 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2391 }
2392 } else
2393 nfsi->cache_validity |=
2394 save_cache_validity & NFS_INO_INVALID_SIZE;
2395
2396 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2397 inode_set_atime_to_ts(inode, fattr->atime);
2398 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2399 nfsi->cache_validity |=
2400 save_cache_validity & NFS_INO_INVALID_ATIME;
2401
2402 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2403 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2404 umode_t newmode = inode->i_mode & S_IFMT;
2405 newmode |= fattr->mode & S_IALLUGO;
2406 inode->i_mode = newmode;
2407 invalid |= NFS_INO_INVALID_ACCESS
2408 | NFS_INO_INVALID_ACL;
2409 }
2410 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2411 nfsi->cache_validity |=
2412 save_cache_validity & NFS_INO_INVALID_MODE;
2413
2414 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2415 if (!uid_eq(inode->i_uid, fattr->uid)) {
2416 invalid |= NFS_INO_INVALID_ACCESS
2417 | NFS_INO_INVALID_ACL;
2418 inode->i_uid = fattr->uid;
2419 }
2420 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2421 nfsi->cache_validity |=
2422 save_cache_validity & NFS_INO_INVALID_OTHER;
2423
2424 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2425 if (!gid_eq(inode->i_gid, fattr->gid)) {
2426 invalid |= NFS_INO_INVALID_ACCESS
2427 | NFS_INO_INVALID_ACL;
2428 inode->i_gid = fattr->gid;
2429 }
2430 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2431 nfsi->cache_validity |=
2432 save_cache_validity & NFS_INO_INVALID_OTHER;
2433
2434 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2435 if (inode->i_nlink != fattr->nlink)
2436 set_nlink(inode, fattr->nlink);
2437 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2438 nfsi->cache_validity |=
2439 save_cache_validity & NFS_INO_INVALID_NLINK;
2440
2441 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2442 /*
2443 * report the blocks in 512byte units
2444 */
2445 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2446 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2447 nfsi->cache_validity |=
2448 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2449
2450 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2451 inode->i_blocks = fattr->du.nfs2.blocks;
2452 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2453 nfsi->cache_validity |=
2454 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2455
2456 /* Update attrtimeo value if we're out of the unstable period */
2457 if (attr_changed) {
2458 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2459 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2460 nfsi->attrtimeo_timestamp = now;
2461 /* Set barrier to be more recent than all outstanding updates */
2462 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2463 } else {
2464 if (cache_revalidated) {
2465 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2466 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2467 nfsi->attrtimeo <<= 1;
2468 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2469 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2470 }
2471 nfsi->attrtimeo_timestamp = now;
2472 }
2473 /* Set the barrier to be more recent than this fattr */
2474 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2475 nfsi->attr_gencount = fattr->gencount;
2476 }
2477
2478 /* Don't invalidate the data if we were to blame */
2479 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2480 || S_ISLNK(inode->i_mode)))
2481 invalid &= ~NFS_INO_INVALID_DATA;
2482 nfs_set_cache_invalid(inode, invalid);
2483
2484 return 0;
2485 out_err:
2486 /*
2487 * No need to worry about unhashing the dentry, as the
2488 * lookup validation will know that the inode is bad.
2489 * (But we fall through to invalidate the caches.)
2490 */
2491 nfs_set_inode_stale_locked(inode);
2492 return -ESTALE;
2493 }
2494
nfs_alloc_inode(struct super_block * sb)2495 struct inode *nfs_alloc_inode(struct super_block *sb)
2496 {
2497 struct nfs_inode *nfsi;
2498 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2499 if (!nfsi)
2500 return NULL;
2501 nfsi->flags = 0UL;
2502 nfsi->cache_validity = 0UL;
2503 nfsi->ooo = NULL;
2504 #if IS_ENABLED(CONFIG_NFS_V4)
2505 nfsi->nfs4_acl = NULL;
2506 #endif /* CONFIG_NFS_V4 */
2507 #ifdef CONFIG_NFS_V4_2
2508 nfsi->xattr_cache = NULL;
2509 #endif
2510 nfs_netfs_inode_init(nfsi);
2511
2512 return &nfsi->vfs_inode;
2513 }
2514 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2515
nfs_free_inode(struct inode * inode)2516 void nfs_free_inode(struct inode *inode)
2517 {
2518 kfree(NFS_I(inode)->ooo);
2519 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2520 }
2521 EXPORT_SYMBOL_GPL(nfs_free_inode);
2522
nfs4_init_once(struct nfs_inode * nfsi)2523 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2524 {
2525 #if IS_ENABLED(CONFIG_NFS_V4)
2526 INIT_LIST_HEAD(&nfsi->open_states);
2527 nfsi->delegation = NULL;
2528 init_rwsem(&nfsi->rwsem);
2529 nfsi->layout = NULL;
2530 #endif
2531 }
2532
init_once(void * foo)2533 static void init_once(void *foo)
2534 {
2535 struct nfs_inode *nfsi = foo;
2536
2537 inode_init_once(&nfsi->vfs_inode);
2538 INIT_LIST_HEAD(&nfsi->open_files);
2539 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2540 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2541 nfs4_init_once(nfsi);
2542 }
2543
nfs_init_inodecache(void)2544 static int __init nfs_init_inodecache(void)
2545 {
2546 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2547 sizeof(struct nfs_inode),
2548 0, (SLAB_RECLAIM_ACCOUNT|
2549 SLAB_ACCOUNT),
2550 init_once);
2551 if (nfs_inode_cachep == NULL)
2552 return -ENOMEM;
2553
2554 return 0;
2555 }
2556
nfs_destroy_inodecache(void)2557 static void nfs_destroy_inodecache(void)
2558 {
2559 /*
2560 * Make sure all delayed rcu free inodes are flushed before we
2561 * destroy cache.
2562 */
2563 rcu_barrier();
2564 kmem_cache_destroy(nfs_inode_cachep);
2565 }
2566
2567 struct workqueue_struct *nfslocaliod_workqueue;
2568 struct workqueue_struct *nfsiod_workqueue;
2569 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2570
2571 /*
2572 * Destroy the nfsiod workqueues
2573 */
nfsiod_stop(void)2574 static void nfsiod_stop(void)
2575 {
2576 struct workqueue_struct *wq;
2577
2578 wq = nfsiod_workqueue;
2579 if (wq != NULL) {
2580 nfsiod_workqueue = NULL;
2581 destroy_workqueue(wq);
2582 }
2583 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2584 wq = nfslocaliod_workqueue;
2585 if (wq != NULL) {
2586 nfslocaliod_workqueue = NULL;
2587 destroy_workqueue(wq);
2588 }
2589 #endif /* CONFIG_NFS_LOCALIO */
2590 }
2591
2592 /*
2593 * Start the nfsiod workqueues
2594 */
nfsiod_start(void)2595 static int nfsiod_start(void)
2596 {
2597 dprintk("RPC: creating workqueue nfsiod\n");
2598 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2599 if (nfsiod_workqueue == NULL)
2600 return -ENOMEM;
2601 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2602 /*
2603 * localio writes need to use a normal (non-memreclaim) workqueue.
2604 * When we start getting low on space, XFS goes and calls flush_work() on
2605 * a non-memreclaim work queue, which causes a priority inversion problem.
2606 */
2607 dprintk("RPC: creating workqueue nfslocaliod\n");
2608 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0);
2609 if (unlikely(nfslocaliod_workqueue == NULL)) {
2610 nfsiod_stop();
2611 return -ENOMEM;
2612 }
2613 #endif /* CONFIG_NFS_LOCALIO */
2614 return 0;
2615 }
2616
2617 unsigned int nfs_net_id;
2618 EXPORT_SYMBOL_GPL(nfs_net_id);
2619
nfs_net_init(struct net * net)2620 static int nfs_net_init(struct net *net)
2621 {
2622 struct nfs_net *nn = net_generic(net, nfs_net_id);
2623 int err;
2624
2625 nfs_clients_init(net);
2626
2627 if (!rpc_proc_register(net, &nn->rpcstats)) {
2628 err = -ENOMEM;
2629 goto err_proc_rpc;
2630 }
2631
2632 err = nfs_fs_proc_net_init(net);
2633 if (err)
2634 goto err_proc_nfs;
2635
2636 return 0;
2637
2638 err_proc_nfs:
2639 rpc_proc_unregister(net, "nfs");
2640 err_proc_rpc:
2641 nfs_clients_exit(net);
2642 return err;
2643 }
2644
nfs_net_exit(struct net * net)2645 static void nfs_net_exit(struct net *net)
2646 {
2647 rpc_proc_unregister(net, "nfs");
2648 nfs_fs_proc_net_exit(net);
2649 nfs_clients_exit(net);
2650 }
2651
2652 static struct pernet_operations nfs_net_ops = {
2653 .init = nfs_net_init,
2654 .exit = nfs_net_exit,
2655 .id = &nfs_net_id,
2656 .size = sizeof(struct nfs_net),
2657 };
2658
2659 #ifdef CONFIG_KEYS
2660 static struct key *nfs_keyring;
2661
nfs_init_keyring(void)2662 static int __init nfs_init_keyring(void)
2663 {
2664 nfs_keyring = keyring_alloc(".nfs",
2665 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
2666 current_cred(),
2667 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
2668 (KEY_USR_ALL & ~KEY_USR_SETATTR),
2669 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
2670 return PTR_ERR_OR_ZERO(nfs_keyring);
2671 }
2672
nfs_exit_keyring(void)2673 static void nfs_exit_keyring(void)
2674 {
2675 key_put(nfs_keyring);
2676 }
2677 #else
nfs_init_keyring(void)2678 static inline int nfs_init_keyring(void)
2679 {
2680 return 0;
2681 }
2682
nfs_exit_keyring(void)2683 static inline void nfs_exit_keyring(void)
2684 {
2685 }
2686 #endif /* CONFIG_KEYS */
2687
2688 /*
2689 * Initialize NFS
2690 */
init_nfs_fs(void)2691 static int __init init_nfs_fs(void)
2692 {
2693 int err;
2694
2695 err = nfs_init_keyring();
2696 if (err)
2697 return err;
2698
2699 err = nfs_sysfs_init();
2700 if (err < 0)
2701 goto out10;
2702
2703 err = register_pernet_subsys(&nfs_net_ops);
2704 if (err < 0)
2705 goto out9;
2706
2707 err = nfsiod_start();
2708 if (err)
2709 goto out7;
2710
2711 err = nfs_fs_proc_init();
2712 if (err)
2713 goto out6;
2714
2715 err = nfs_init_nfspagecache();
2716 if (err)
2717 goto out5;
2718
2719 err = nfs_init_inodecache();
2720 if (err)
2721 goto out4;
2722
2723 err = nfs_init_readpagecache();
2724 if (err)
2725 goto out3;
2726
2727 err = nfs_init_writepagecache();
2728 if (err)
2729 goto out2;
2730
2731 err = nfs_init_directcache();
2732 if (err)
2733 goto out1;
2734
2735 err = register_nfs_fs();
2736 if (err)
2737 goto out0;
2738
2739 return 0;
2740 out0:
2741 nfs_destroy_directcache();
2742 out1:
2743 nfs_destroy_writepagecache();
2744 out2:
2745 nfs_destroy_readpagecache();
2746 out3:
2747 nfs_destroy_inodecache();
2748 out4:
2749 nfs_destroy_nfspagecache();
2750 out5:
2751 nfs_fs_proc_exit();
2752 out6:
2753 nfsiod_stop();
2754 out7:
2755 unregister_pernet_subsys(&nfs_net_ops);
2756 out9:
2757 nfs_sysfs_exit();
2758 out10:
2759 nfs_exit_keyring();
2760 return err;
2761 }
2762
exit_nfs_fs(void)2763 static void __exit exit_nfs_fs(void)
2764 {
2765 nfs_destroy_directcache();
2766 nfs_destroy_writepagecache();
2767 nfs_destroy_readpagecache();
2768 nfs_destroy_inodecache();
2769 nfs_destroy_nfspagecache();
2770 unregister_pernet_subsys(&nfs_net_ops);
2771 unregister_nfs_fs();
2772 nfs_fs_proc_exit();
2773 nfsiod_stop();
2774 nfs_sysfs_exit();
2775 nfs_exit_keyring();
2776 }
2777
2778 /* Not quite true; I just maintain it */
2779 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2780 MODULE_DESCRIPTION("NFS client support");
2781 MODULE_LICENSE("GPL");
2782 module_param(enable_ino64, bool, 0644);
2783
2784 module_init(init_nfs_fs)
2785 module_exit(exit_nfs_fs)
2786