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) || inode_generic_drop(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 icount_read(inode));
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 kuid_t task_uid = current_fsuid();
722 kuid_t owner_uid = inode->i_uid;
723
724 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
725
726 /* skip mode change if it's just for clearing setuid/setgid */
727 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
728 attr->ia_valid &= ~ATTR_MODE;
729
730 if (attr->ia_valid & ATTR_SIZE) {
731 BUG_ON(!S_ISREG(inode->i_mode));
732
733 error = inode_newsize_ok(inode, attr->ia_size);
734 if (error)
735 return error;
736
737 if (attr->ia_size == oldsize)
738 attr->ia_valid &= ~ATTR_SIZE;
739 }
740
741 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
742 spin_lock(&inode->i_lock);
743 if (attr->ia_valid & ATTR_MTIME_SET) {
744 if (uid_eq(task_uid, owner_uid)) {
745 nfs_set_timestamps_to_ts(inode, attr);
746 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET|
747 ATTR_ATIME|ATTR_ATIME_SET);
748 }
749 } else {
750 nfs_update_timestamps(inode, attr->ia_valid);
751 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME);
752 }
753 spin_unlock(&inode->i_lock);
754 } else if (nfs_have_delegated_atime(inode) &&
755 attr->ia_valid & ATTR_ATIME &&
756 !(attr->ia_valid & ATTR_MTIME)) {
757 if (attr->ia_valid & ATTR_ATIME_SET) {
758 if (uid_eq(task_uid, owner_uid)) {
759 spin_lock(&inode->i_lock);
760 nfs_set_timestamps_to_ts(inode, attr);
761 spin_unlock(&inode->i_lock);
762 attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
763 }
764 } else {
765 nfs_update_delegated_atime(inode);
766 attr->ia_valid &= ~ATTR_ATIME;
767 }
768 }
769
770 /* Optimization: if the end result is no change, don't RPC */
771 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
772 return 0;
773
774 trace_nfs_setattr_enter(inode);
775
776 /* Write all dirty data */
777 if (S_ISREG(inode->i_mode)) {
778 nfs_file_block_o_direct(NFS_I(inode));
779 nfs_sync_inode(inode);
780 }
781
782 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
783 if (fattr == NULL) {
784 error = -ENOMEM;
785 goto out;
786 }
787
788 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
789 if (error == 0) {
790 if (attr->ia_valid & ATTR_SIZE)
791 nfs_truncate_last_folio(inode->i_mapping, oldsize,
792 attr->ia_size);
793 error = nfs_refresh_inode(inode, fattr);
794 }
795 nfs_free_fattr(fattr);
796 out:
797 trace_nfs_setattr_exit(inode, error);
798 return error;
799 }
800 EXPORT_SYMBOL_GPL(nfs_setattr);
801
802 /**
803 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
804 * @inode: inode of the file used
805 * @offset: file offset to start truncating
806 *
807 * This is a copy of the common vmtruncate, but with the locking
808 * corrected to take into account the fact that NFS requires
809 * inode->i_size to be updated under the inode->i_lock.
810 * Note: must be called with inode->i_lock held!
811 */
nfs_vmtruncate(struct inode * inode,loff_t offset)812 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
813 {
814 int err;
815
816 err = inode_newsize_ok(inode, offset);
817 if (err)
818 goto out;
819
820 trace_nfs_size_truncate(inode, offset);
821 i_size_write(inode, offset);
822 /* Optimisation */
823 if (offset == 0) {
824 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
825 nfs_ooo_clear(NFS_I(inode));
826 }
827 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
828
829 spin_unlock(&inode->i_lock);
830 truncate_pagecache(inode, offset);
831 nfs_update_delegated_mtime_locked(inode);
832 spin_lock(&inode->i_lock);
833 out:
834 return err;
835 }
836
837 /**
838 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
839 * @inode: pointer to struct inode
840 * @attr: pointer to struct iattr
841 * @fattr: pointer to struct nfs_fattr
842 *
843 * Note: we do this in the *proc.c in order to ensure that
844 * it works for things like exclusive creates too.
845 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)846 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
847 struct nfs_fattr *fattr)
848 {
849 /* Barrier: bump the attribute generation count. */
850 nfs_fattr_set_barrier(fattr);
851
852 spin_lock(&inode->i_lock);
853 NFS_I(inode)->attr_gencount = fattr->gencount;
854 if ((attr->ia_valid & ATTR_SIZE) != 0) {
855 if (!nfs_have_delegated_mtime(inode))
856 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
857 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
858 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
859 nfs_vmtruncate(inode, attr->ia_size);
860 }
861 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
862 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
863 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
864 inode->i_mode & S_ISUID)
865 inode->i_mode &= ~S_ISUID;
866 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
867 inode->i_mode &= ~S_ISGID;
868 if ((attr->ia_valid & ATTR_MODE) != 0) {
869 int mode = attr->ia_mode & S_IALLUGO;
870 mode |= inode->i_mode & ~S_IALLUGO;
871 inode->i_mode = mode;
872 }
873 if ((attr->ia_valid & ATTR_UID) != 0)
874 inode->i_uid = attr->ia_uid;
875 if ((attr->ia_valid & ATTR_GID) != 0)
876 inode->i_gid = attr->ia_gid;
877 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
878 inode_set_ctime_to_ts(inode, fattr->ctime);
879 else
880 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
881 | NFS_INO_INVALID_CTIME);
882 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
883 | NFS_INO_INVALID_ACL);
884 }
885 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
886 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
887 | NFS_INO_INVALID_CTIME);
888 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
889 inode_set_atime_to_ts(inode, fattr->atime);
890 else if (attr->ia_valid & ATTR_ATIME_SET)
891 inode_set_atime_to_ts(inode, attr->ia_atime);
892 else
893 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
894
895 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
896 inode_set_ctime_to_ts(inode, fattr->ctime);
897 else
898 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
899 | NFS_INO_INVALID_CTIME);
900 }
901 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
902 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
903 | NFS_INO_INVALID_CTIME);
904 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
905 inode_set_mtime_to_ts(inode, fattr->mtime);
906 else if (attr->ia_valid & ATTR_MTIME_SET)
907 inode_set_mtime_to_ts(inode, attr->ia_mtime);
908 else
909 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
910
911 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
912 inode_set_ctime_to_ts(inode, fattr->ctime);
913 else
914 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
915 | NFS_INO_INVALID_CTIME);
916 }
917 if (fattr->valid)
918 nfs_update_inode(inode, fattr);
919 spin_unlock(&inode->i_lock);
920 }
921 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
922
923 /*
924 * Don't request help from readdirplus if the file is being written to,
925 * or if attribute caching is turned off
926 */
nfs_getattr_readdirplus_enable(const struct inode * inode)927 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
928 {
929 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
930 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
931 }
932
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)933 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
934 {
935 if (!IS_ROOT(dentry)) {
936 struct dentry *parent = dget_parent(dentry);
937 nfs_readdir_record_entry_cache_miss(d_inode(parent));
938 dput(parent);
939 }
940 }
941
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)942 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
943 {
944 if (!IS_ROOT(dentry)) {
945 struct dentry *parent = dget_parent(dentry);
946 nfs_readdir_record_entry_cache_hit(d_inode(parent));
947 dput(parent);
948 }
949 }
950
nfs_get_valid_attrmask(struct inode * inode)951 static u32 nfs_get_valid_attrmask(struct inode *inode)
952 {
953 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid;
954 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
955 u32 reply_mask = STATX_INO | STATX_TYPE;
956
957 if (!(cache_validity & NFS_INO_INVALID_ATIME))
958 reply_mask |= STATX_ATIME;
959 if (!(cache_validity & NFS_INO_INVALID_CTIME))
960 reply_mask |= STATX_CTIME;
961 if (!(cache_validity & NFS_INO_INVALID_MTIME))
962 reply_mask |= STATX_MTIME;
963 if (!(cache_validity & NFS_INO_INVALID_SIZE))
964 reply_mask |= STATX_SIZE;
965 if (!(cache_validity & NFS_INO_INVALID_NLINK))
966 reply_mask |= STATX_NLINK;
967 if (!(cache_validity & NFS_INO_INVALID_MODE))
968 reply_mask |= STATX_MODE;
969 if (!(cache_validity & NFS_INO_INVALID_OTHER))
970 reply_mask |= STATX_UID | STATX_GID;
971 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
972 reply_mask |= STATX_BLOCKS;
973 if (!(cache_validity & NFS_INO_INVALID_BTIME) &&
974 (fattr_valid & NFS_ATTR_FATTR_BTIME))
975 reply_mask |= STATX_BTIME;
976 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
977 reply_mask |= STATX_CHANGE_COOKIE;
978 return reply_mask;
979 }
980
nfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)981 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
982 struct kstat *stat, u32 request_mask, unsigned int query_flags)
983 {
984 struct inode *inode = d_inode(path->dentry);
985 struct nfs_server *server = NFS_SERVER(inode);
986 u64 fattr_valid = server->fattr_valid;
987 unsigned long cache_validity;
988 int err = 0;
989 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
990 bool do_update = false;
991 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
992
993 trace_nfs_getattr_enter(inode);
994
995 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
996 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
997 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME |
998 STATX_CHANGE_COOKIE;
999
1000 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME))
1001 request_mask &= ~STATX_BTIME;
1002
1003 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
1004 if (readdirplus_enabled)
1005 nfs_readdirplus_parent_cache_hit(path->dentry);
1006 goto out_no_revalidate;
1007 }
1008
1009 /* Flush out writes to the server in order to update c/mtime/version. */
1010 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
1011 S_ISREG(inode->i_mode)) {
1012 if (nfs_have_delegated_mtime(inode))
1013 filemap_fdatawrite(inode->i_mapping);
1014 else
1015 filemap_write_and_wait(inode->i_mapping);
1016 }
1017
1018 /*
1019 * We may force a getattr if the user cares about atime.
1020 *
1021 * Note that we only have to check the vfsmount flags here:
1022 * - NFS always sets S_NOATIME by so checking it would give a
1023 * bogus result
1024 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
1025 * no point in checking those.
1026 */
1027 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
1028 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1029 request_mask &= ~STATX_ATIME;
1030
1031 /* Is the user requesting attributes that might need revalidation? */
1032 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
1033 STATX_MTIME|STATX_UID|STATX_GID|
1034 STATX_SIZE|STATX_BLOCKS|STATX_BTIME|
1035 STATX_CHANGE_COOKIE)))
1036 goto out_no_revalidate;
1037
1038 /* Check whether the cached attributes are stale */
1039 do_update |= force_sync || nfs_attribute_cache_expired(inode);
1040 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
1041 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
1042 if (request_mask & STATX_ATIME)
1043 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
1044 if (request_mask & STATX_CTIME)
1045 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
1046 if (request_mask & STATX_MTIME)
1047 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
1048 if (request_mask & STATX_SIZE)
1049 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
1050 if (request_mask & STATX_NLINK)
1051 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
1052 if (request_mask & STATX_MODE)
1053 do_update |= cache_validity & NFS_INO_INVALID_MODE;
1054 if (request_mask & (STATX_UID | STATX_GID))
1055 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
1056 if (request_mask & STATX_BLOCKS)
1057 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
1058 if (request_mask & STATX_BTIME)
1059 do_update |= cache_validity & NFS_INO_INVALID_BTIME;
1060
1061 if (do_update) {
1062 if (readdirplus_enabled)
1063 nfs_readdirplus_parent_cache_miss(path->dentry);
1064 err = __nfs_revalidate_inode(server, inode);
1065 if (err)
1066 goto out;
1067 } else if (readdirplus_enabled)
1068 nfs_readdirplus_parent_cache_hit(path->dentry);
1069 out_no_revalidate:
1070 /* Only return attributes that were revalidated. */
1071 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
1072
1073 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1074 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
1075 stat->change_cookie = inode_peek_iversion_raw(inode);
1076 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
1077 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
1078 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
1079 if (S_ISDIR(inode->i_mode))
1080 stat->blksize = NFS_SERVER(inode)->dtsize;
1081 stat->btime = NFS_I(inode)->btime;
1082
1083 /* Special handling for STATX_DIOALIGN and STATX_DIO_READ_ALIGN
1084 * - NFS doesn't have DIO alignment constraints, avoid getting
1085 * these DIO attrs from remote and just respond with most
1086 * accommodating limits (so client will issue supported DIO).
1087 * - this is unintuitive, but the most coarse-grained
1088 * dio_offset_align is the most accommodating.
1089 */
1090 if ((request_mask & (STATX_DIOALIGN | STATX_DIO_READ_ALIGN)) &&
1091 S_ISREG(inode->i_mode)) {
1092 stat->result_mask |= STATX_DIOALIGN | STATX_DIO_READ_ALIGN;
1093 stat->dio_mem_align = 4; /* 4-byte alignment */
1094 stat->dio_offset_align = PAGE_SIZE;
1095 stat->dio_read_offset_align = stat->dio_offset_align;
1096 }
1097 out:
1098 trace_nfs_getattr_exit(inode, err);
1099 return err;
1100 }
1101 EXPORT_SYMBOL_GPL(nfs_getattr);
1102
nfs_init_lock_context(struct nfs_lock_context * l_ctx)1103 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
1104 {
1105 refcount_set(&l_ctx->count, 1);
1106 l_ctx->lockowner = current->files;
1107 INIT_LIST_HEAD(&l_ctx->list);
1108 atomic_set(&l_ctx->io_count, 0);
1109 }
1110
__nfs_find_lock_context(struct nfs_open_context * ctx)1111 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
1112 {
1113 struct nfs_lock_context *pos;
1114
1115 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
1116 if (pos->lockowner != current->files)
1117 continue;
1118 if (refcount_inc_not_zero(&pos->count))
1119 return pos;
1120 }
1121 return NULL;
1122 }
1123
nfs_get_lock_context(struct nfs_open_context * ctx)1124 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
1125 {
1126 struct nfs_lock_context *res, *new = NULL;
1127 struct inode *inode = d_inode(ctx->dentry);
1128
1129 rcu_read_lock();
1130 res = __nfs_find_lock_context(ctx);
1131 rcu_read_unlock();
1132 if (res == NULL) {
1133 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
1134 if (new == NULL)
1135 return ERR_PTR(-ENOMEM);
1136 nfs_init_lock_context(new);
1137 spin_lock(&inode->i_lock);
1138 res = __nfs_find_lock_context(ctx);
1139 if (res == NULL) {
1140 new->open_context = get_nfs_open_context(ctx);
1141 if (new->open_context) {
1142 list_add_tail_rcu(&new->list,
1143 &ctx->lock_context.list);
1144 res = new;
1145 new = NULL;
1146 } else
1147 res = ERR_PTR(-EBADF);
1148 }
1149 spin_unlock(&inode->i_lock);
1150 kfree(new);
1151 }
1152 return res;
1153 }
1154 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
1155
nfs_put_lock_context(struct nfs_lock_context * l_ctx)1156 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
1157 {
1158 struct nfs_open_context *ctx = l_ctx->open_context;
1159 struct inode *inode = d_inode(ctx->dentry);
1160
1161 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
1162 return;
1163 list_del_rcu(&l_ctx->list);
1164 spin_unlock(&inode->i_lock);
1165 put_nfs_open_context(ctx);
1166 kfree_rcu(l_ctx, rcu_head);
1167 }
1168 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
1169
1170 /**
1171 * nfs_close_context - Common close_context() routine NFSv2/v3
1172 * @ctx: pointer to context
1173 * @is_sync: is this a synchronous close
1174 *
1175 * Ensure that the attributes are up to date if we're mounted
1176 * with close-to-open semantics and we have cached data that will
1177 * need to be revalidated on open.
1178 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1179 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1180 {
1181 struct nfs_inode *nfsi;
1182 struct inode *inode;
1183
1184 if (!(ctx->mode & FMODE_WRITE))
1185 return;
1186 if (!is_sync)
1187 return;
1188 inode = d_inode(ctx->dentry);
1189 if (nfs_have_read_or_write_delegation(inode))
1190 return;
1191 nfsi = NFS_I(inode);
1192 if (inode->i_mapping->nrpages == 0)
1193 return;
1194 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1195 return;
1196 if (!list_empty(&nfsi->open_files))
1197 return;
1198 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1199 return;
1200 nfs_revalidate_inode(inode,
1201 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1202 }
1203 EXPORT_SYMBOL_GPL(nfs_close_context);
1204
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1205 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1206 fmode_t f_mode,
1207 struct file *filp)
1208 {
1209 struct nfs_open_context *ctx;
1210
1211 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1212 if (!ctx)
1213 return ERR_PTR(-ENOMEM);
1214 nfs_sb_active(dentry->d_sb);
1215 ctx->dentry = dget(dentry);
1216 if (filp)
1217 ctx->cred = get_cred(filp->f_cred);
1218 else
1219 ctx->cred = get_current_cred();
1220 rcu_assign_pointer(ctx->ll_cred, NULL);
1221 ctx->state = NULL;
1222 ctx->mode = f_mode;
1223 ctx->flags = 0;
1224 ctx->error = 0;
1225 ctx->flock_owner = (fl_owner_t)filp;
1226 nfs_init_lock_context(&ctx->lock_context);
1227 ctx->lock_context.open_context = ctx;
1228 INIT_LIST_HEAD(&ctx->list);
1229 ctx->mdsthreshold = NULL;
1230 nfs_localio_file_init(&ctx->nfl);
1231
1232 return ctx;
1233 }
1234 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1235
get_nfs_open_context(struct nfs_open_context * ctx)1236 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1237 {
1238 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1239 return ctx;
1240 return NULL;
1241 }
1242 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1243
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1244 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1245 {
1246 struct inode *inode = d_inode(ctx->dentry);
1247 struct super_block *sb = ctx->dentry->d_sb;
1248
1249 if (!refcount_dec_and_test(&ctx->lock_context.count))
1250 return;
1251 if (!list_empty(&ctx->list)) {
1252 spin_lock(&inode->i_lock);
1253 list_del_rcu(&ctx->list);
1254 spin_unlock(&inode->i_lock);
1255 }
1256 if (inode != NULL)
1257 NFS_PROTO(inode)->close_context(ctx, is_sync);
1258 put_cred(ctx->cred);
1259 dput(ctx->dentry);
1260 nfs_sb_deactive(sb);
1261 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1262 kfree(ctx->mdsthreshold);
1263 nfs_close_local_fh(&ctx->nfl);
1264 kfree_rcu(ctx, rcu_head);
1265 }
1266
put_nfs_open_context(struct nfs_open_context * ctx)1267 void put_nfs_open_context(struct nfs_open_context *ctx)
1268 {
1269 __put_nfs_open_context(ctx, 0);
1270 }
1271 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1272
put_nfs_open_context_sync(struct nfs_open_context * ctx)1273 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1274 {
1275 __put_nfs_open_context(ctx, 1);
1276 }
1277
1278 /*
1279 * Ensure that mmap has a recent RPC credential for use when writing out
1280 * shared pages
1281 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1282 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1283 {
1284 struct inode *inode = d_inode(ctx->dentry);
1285 struct nfs_inode *nfsi = NFS_I(inode);
1286
1287 spin_lock(&inode->i_lock);
1288 if (list_empty(&nfsi->open_files) &&
1289 nfs_ooo_test(nfsi))
1290 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1291 NFS_INO_REVAL_FORCED);
1292 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1293 spin_unlock(&inode->i_lock);
1294 }
1295 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1296
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1297 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1298 {
1299 filp->private_data = get_nfs_open_context(ctx);
1300 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1301 if (list_empty(&ctx->list))
1302 nfs_inode_attach_open_context(ctx);
1303 }
1304 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1305
1306 /*
1307 * Given an inode, search for an open context with the desired characteristics
1308 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1309 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1310 {
1311 struct nfs_inode *nfsi = NFS_I(inode);
1312 struct nfs_open_context *pos, *ctx = NULL;
1313
1314 rcu_read_lock();
1315 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1316 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1317 continue;
1318 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1319 continue;
1320 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1321 continue;
1322 ctx = get_nfs_open_context(pos);
1323 if (ctx)
1324 break;
1325 }
1326 rcu_read_unlock();
1327 return ctx;
1328 }
1329
nfs_file_clear_open_context(struct file * filp)1330 void nfs_file_clear_open_context(struct file *filp)
1331 {
1332 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1333
1334 if (ctx) {
1335 struct inode *inode = d_inode(ctx->dentry);
1336
1337 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1338 /*
1339 * We fatal error on write before. Try to writeback
1340 * every page again.
1341 */
1342 if (ctx->error < 0)
1343 invalidate_inode_pages2(inode->i_mapping);
1344 filp->private_data = NULL;
1345 put_nfs_open_context_sync(ctx);
1346 }
1347 }
1348
1349 /*
1350 * These allocate and release file read/write context information.
1351 */
nfs_open(struct inode * inode,struct file * filp)1352 int nfs_open(struct inode *inode, struct file *filp)
1353 {
1354 struct nfs_open_context *ctx;
1355
1356 ctx = alloc_nfs_open_context(file_dentry(filp),
1357 flags_to_mode(filp->f_flags), filp);
1358 if (IS_ERR(ctx))
1359 return PTR_ERR(ctx);
1360 nfs_file_set_open_context(filp, ctx);
1361 put_nfs_open_context(ctx);
1362 nfs_fscache_open_file(inode, filp);
1363 return 0;
1364 }
1365
1366 /*
1367 * This function is called whenever some part of NFS notices that
1368 * the cached attributes have to be refreshed.
1369 */
1370 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1371 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1372 {
1373 int status = -ESTALE;
1374 struct nfs_fattr *fattr = NULL;
1375 struct nfs_inode *nfsi = NFS_I(inode);
1376
1377 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1378 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1379
1380 trace_nfs_revalidate_inode_enter(inode);
1381
1382 if (is_bad_inode(inode))
1383 goto out;
1384 if (NFS_STALE(inode))
1385 goto out;
1386
1387 /* pNFS: Attributes aren't updated until we layoutcommit */
1388 if (S_ISREG(inode->i_mode)) {
1389 status = pnfs_sync_inode(inode, false);
1390 if (status)
1391 goto out;
1392 }
1393
1394 status = -ENOMEM;
1395 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1396 if (fattr == NULL)
1397 goto out;
1398
1399 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1400
1401 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1402 if (status != 0) {
1403 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1404 inode->i_sb->s_id,
1405 (unsigned long long)NFS_FILEID(inode), status);
1406 switch (status) {
1407 case -ETIMEDOUT:
1408 /* A soft timeout occurred. Use cached information? */
1409 if (server->flags & NFS_MOUNT_SOFTREVAL)
1410 status = 0;
1411 break;
1412 case -ESTALE:
1413 if (!S_ISDIR(inode->i_mode))
1414 nfs_set_inode_stale(inode);
1415 else
1416 nfs_zap_caches(inode);
1417 }
1418 goto out;
1419 }
1420
1421 status = nfs_refresh_inode(inode, fattr);
1422 if (status) {
1423 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1424 inode->i_sb->s_id,
1425 (unsigned long long)NFS_FILEID(inode), status);
1426 goto out;
1427 }
1428
1429 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1430 nfs_zap_acl_cache(inode);
1431
1432 nfs_setsecurity(inode, fattr);
1433
1434 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1435 inode->i_sb->s_id,
1436 (unsigned long long)NFS_FILEID(inode));
1437
1438 out:
1439 nfs_free_fattr(fattr);
1440 trace_nfs_revalidate_inode_exit(inode, status);
1441 return status;
1442 }
1443
nfs_attribute_cache_expired(struct inode * inode)1444 int nfs_attribute_cache_expired(struct inode *inode)
1445 {
1446 if (nfs_have_delegated_attributes(inode))
1447 return 0;
1448 return nfs_attribute_timeout(inode);
1449 }
1450
1451 /**
1452 * nfs_revalidate_inode - Revalidate the inode attributes
1453 * @inode: pointer to inode struct
1454 * @flags: cache flags to check
1455 *
1456 * Updates inode attribute information by retrieving the data from the server.
1457 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1458 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1459 {
1460 if (!nfs_check_cache_invalid(inode, flags))
1461 return NFS_STALE(inode) ? -ESTALE : 0;
1462 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1463 }
1464 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1465
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1466 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1467 {
1468 int ret;
1469
1470 nfs_fscache_invalidate(inode, 0);
1471 if (mapping->nrpages != 0) {
1472 if (S_ISREG(inode->i_mode)) {
1473 ret = nfs_sync_mapping(mapping);
1474 if (ret < 0)
1475 return ret;
1476 }
1477 ret = invalidate_inode_pages2(mapping);
1478 if (ret < 0)
1479 return ret;
1480 }
1481 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1482
1483 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1484 inode->i_sb->s_id,
1485 (unsigned long long)NFS_FILEID(inode));
1486 return 0;
1487 }
1488
1489 /**
1490 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1491 * @mapping: pointer to mapping
1492 *
1493 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1494 */
nfs_clear_invalid_mapping(struct address_space * mapping)1495 int nfs_clear_invalid_mapping(struct address_space *mapping)
1496 {
1497 struct inode *inode = mapping->host;
1498 struct nfs_inode *nfsi = NFS_I(inode);
1499 unsigned long *bitlock = &nfsi->flags;
1500 int ret = 0;
1501
1502 /*
1503 * We must clear NFS_INO_INVALID_DATA first to ensure that
1504 * invalidations that come in while we're shooting down the mappings
1505 * are respected. But, that leaves a race window where one revalidator
1506 * can clear the flag, and then another checks it before the mapping
1507 * gets invalidated. Fix that by serializing access to this part of
1508 * the function.
1509 *
1510 * At the same time, we need to allow other tasks to see whether we
1511 * might be in the middle of invalidating the pages, so we only set
1512 * the bit lock here if it looks like we're going to be doing that.
1513 */
1514 for (;;) {
1515 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1516 nfs_wait_bit_killable,
1517 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1518 if (ret)
1519 goto out;
1520 smp_rmb(); /* pairs with smp_wmb() below */
1521 if (test_bit(NFS_INO_INVALIDATING, bitlock))
1522 continue;
1523 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */
1524 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA))
1525 goto out;
1526 /* Slow-path that double-checks with spinlock held */
1527 spin_lock(&inode->i_lock);
1528 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1529 spin_unlock(&inode->i_lock);
1530 continue;
1531 }
1532 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1533 break;
1534 spin_unlock(&inode->i_lock);
1535 goto out;
1536 }
1537
1538 set_bit(NFS_INO_INVALIDATING, bitlock);
1539 smp_wmb();
1540 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1541 nfs_ooo_clear(nfsi);
1542 spin_unlock(&inode->i_lock);
1543 trace_nfs_invalidate_mapping_enter(inode);
1544 ret = nfs_invalidate_mapping(inode, mapping);
1545 trace_nfs_invalidate_mapping_exit(inode, ret);
1546
1547 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1548 smp_mb__after_atomic();
1549 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1550 out:
1551 return ret;
1552 }
1553
nfs_mapping_need_revalidate_inode(struct inode * inode)1554 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1555 {
1556 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1557 NFS_STALE(inode);
1558 }
1559
nfs_revalidate_mapping_rcu(struct inode * inode)1560 int nfs_revalidate_mapping_rcu(struct inode *inode)
1561 {
1562 struct nfs_inode *nfsi = NFS_I(inode);
1563 unsigned long *bitlock = &nfsi->flags;
1564 int ret = 0;
1565
1566 if (IS_SWAPFILE(inode))
1567 goto out;
1568 if (nfs_mapping_need_revalidate_inode(inode)) {
1569 ret = -ECHILD;
1570 goto out;
1571 }
1572 spin_lock(&inode->i_lock);
1573 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1574 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1575 ret = -ECHILD;
1576 spin_unlock(&inode->i_lock);
1577 out:
1578 return ret;
1579 }
1580
1581 /**
1582 * nfs_revalidate_mapping - Revalidate the pagecache
1583 * @inode: pointer to host inode
1584 * @mapping: pointer to mapping
1585 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1586 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1587 {
1588 /* swapfiles are not supposed to be shared. */
1589 if (IS_SWAPFILE(inode))
1590 return 0;
1591
1592 if (nfs_mapping_need_revalidate_inode(inode)) {
1593 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1594 if (ret < 0)
1595 return ret;
1596 }
1597
1598 return nfs_clear_invalid_mapping(mapping);
1599 }
1600
nfs_file_has_writers(struct nfs_inode * nfsi)1601 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1602 {
1603 struct inode *inode = &nfsi->vfs_inode;
1604
1605 if (!S_ISREG(inode->i_mode))
1606 return false;
1607 if (list_empty(&nfsi->open_files))
1608 return false;
1609 return inode_is_open_for_write(inode);
1610 }
1611
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1612 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1613 {
1614 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1615 }
1616
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1617 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1618 {
1619 struct timespec64 ts;
1620
1621 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1622 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1623 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1624 inode_set_iversion_raw(inode, fattr->change_attr);
1625 if (S_ISDIR(inode->i_mode))
1626 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1627 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1628 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1629 }
1630 /* If we have atomic WCC data, we may update some attributes */
1631 ts = inode_get_ctime(inode);
1632 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1633 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1634 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1635 inode_set_ctime_to_ts(inode, fattr->ctime);
1636 }
1637
1638 ts = inode_get_mtime(inode);
1639 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1640 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1641 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1642 inode_set_mtime_to_ts(inode, fattr->mtime);
1643 }
1644 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1645 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1646 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1647 && !nfs_have_writebacks(inode)) {
1648 trace_nfs_size_wcc(inode, fattr->size);
1649 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1650 }
1651 }
1652
1653 /**
1654 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1655 * @inode: pointer to inode
1656 * @fattr: updated attributes
1657 *
1658 * Verifies the attribute cache. If we have just changed the attributes,
1659 * so that fattr carries weak cache consistency data, then it may
1660 * also update the ctime/mtime/change_attribute.
1661 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1662 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1663 {
1664 struct nfs_inode *nfsi = NFS_I(inode);
1665 loff_t cur_size, new_isize;
1666 unsigned long invalid = 0;
1667 struct timespec64 ts;
1668
1669 if (nfs_have_delegated_attributes(inode))
1670 return 0;
1671
1672 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1673 /* Only a mounted-on-fileid? Just exit */
1674 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1675 return 0;
1676 /* Has the inode gone and changed behind our back? */
1677 } else if (nfsi->fileid != fattr->fileid) {
1678 /* Is this perhaps the mounted-on fileid? */
1679 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1680 nfsi->fileid == fattr->mounted_on_fileid)
1681 return 0;
1682 return -ESTALE;
1683 }
1684 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1685 return -ESTALE;
1686
1687
1688 if (!nfs_file_has_buffered_writers(nfsi)) {
1689 /* Verify a few of the more important attributes */
1690 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1691 invalid |= NFS_INO_INVALID_CHANGE;
1692
1693 ts = inode_get_mtime(inode);
1694 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1695 invalid |= NFS_INO_INVALID_MTIME;
1696
1697 ts = inode_get_ctime(inode);
1698 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1699 invalid |= NFS_INO_INVALID_CTIME;
1700
1701 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1702 cur_size = i_size_read(inode);
1703 new_isize = nfs_size_to_loff_t(fattr->size);
1704 if (cur_size != new_isize)
1705 invalid |= NFS_INO_INVALID_SIZE;
1706 }
1707 }
1708
1709 /* Have any file permissions changed? */
1710 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1711 invalid |= NFS_INO_INVALID_MODE;
1712 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1713 invalid |= NFS_INO_INVALID_OTHER;
1714 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1715 invalid |= NFS_INO_INVALID_OTHER;
1716
1717 /* Has the link count changed? */
1718 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1719 invalid |= NFS_INO_INVALID_NLINK;
1720
1721 ts = inode_get_atime(inode);
1722 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1723 invalid |= NFS_INO_INVALID_ATIME;
1724
1725 if (invalid != 0)
1726 nfs_set_cache_invalid(inode, invalid);
1727
1728 nfsi->read_cache_jiffies = fattr->time_start;
1729 return 0;
1730 }
1731
1732 static atomic_long_t nfs_attr_generation_counter;
1733
nfs_read_attr_generation_counter(void)1734 static unsigned long nfs_read_attr_generation_counter(void)
1735 {
1736 return atomic_long_read(&nfs_attr_generation_counter);
1737 }
1738
nfs_inc_attr_generation_counter(void)1739 unsigned long nfs_inc_attr_generation_counter(void)
1740 {
1741 return atomic_long_inc_return(&nfs_attr_generation_counter);
1742 }
1743 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1744
nfs_fattr_init(struct nfs_fattr * fattr)1745 void nfs_fattr_init(struct nfs_fattr *fattr)
1746 {
1747 fattr->valid = 0;
1748 fattr->time_start = jiffies;
1749 fattr->gencount = nfs_inc_attr_generation_counter();
1750 fattr->owner_name = NULL;
1751 fattr->group_name = NULL;
1752 fattr->mdsthreshold = NULL;
1753 }
1754 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1755
1756 /**
1757 * nfs_fattr_set_barrier
1758 * @fattr: attributes
1759 *
1760 * Used to set a barrier after an attribute was updated. This
1761 * barrier ensures that older attributes from RPC calls that may
1762 * have raced with our update cannot clobber these new values.
1763 * Note that you are still responsible for ensuring that other
1764 * operations which change the attribute on the server do not
1765 * collide.
1766 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1767 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1768 {
1769 fattr->gencount = nfs_inc_attr_generation_counter();
1770 }
1771
nfs_alloc_fattr(void)1772 struct nfs_fattr *nfs_alloc_fattr(void)
1773 {
1774 struct nfs_fattr *fattr;
1775
1776 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1777 if (fattr != NULL) {
1778 nfs_fattr_init(fattr);
1779 fattr->label = NULL;
1780 }
1781 return fattr;
1782 }
1783 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1784
nfs_alloc_fattr_with_label(struct nfs_server * server)1785 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1786 {
1787 struct nfs_fattr *fattr = nfs_alloc_fattr();
1788
1789 if (!fattr)
1790 return NULL;
1791
1792 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1793 if (IS_ERR(fattr->label)) {
1794 kfree(fattr);
1795 return NULL;
1796 }
1797
1798 return fattr;
1799 }
1800 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1801
nfs_alloc_fhandle(void)1802 struct nfs_fh *nfs_alloc_fhandle(void)
1803 {
1804 struct nfs_fh *fh;
1805
1806 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1807 if (fh != NULL)
1808 fh->size = 0;
1809 return fh;
1810 }
1811 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1812
1813 #ifdef NFS_DEBUG
1814 /*
1815 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1816 * in the same way that wireshark does
1817 *
1818 * @fh: file handle
1819 *
1820 * For debugging only.
1821 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1822 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1823 {
1824 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1825 * not on the result */
1826 return nfs_fhandle_hash(fh);
1827 }
1828 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1829
1830 /*
1831 * _nfs_display_fhandle - display an NFS file handle on the console
1832 *
1833 * @fh: file handle to display
1834 * @caption: display caption
1835 *
1836 * For debugging only.
1837 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1838 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1839 {
1840 unsigned short i;
1841
1842 if (fh == NULL || fh->size == 0) {
1843 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1844 return;
1845 }
1846
1847 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1848 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1849 for (i = 0; i < fh->size; i += 16) {
1850 __be32 *pos = (__be32 *)&fh->data[i];
1851
1852 switch ((fh->size - i - 1) >> 2) {
1853 case 0:
1854 printk(KERN_DEFAULT " %08x\n",
1855 be32_to_cpup(pos));
1856 break;
1857 case 1:
1858 printk(KERN_DEFAULT " %08x %08x\n",
1859 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1860 break;
1861 case 2:
1862 printk(KERN_DEFAULT " %08x %08x %08x\n",
1863 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1864 be32_to_cpup(pos + 2));
1865 break;
1866 default:
1867 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1868 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1869 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1870 }
1871 }
1872 }
1873 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1874 #endif
1875
1876 /**
1877 * nfs_inode_attrs_cmp_generic - compare attributes
1878 * @fattr: attributes
1879 * @inode: pointer to inode
1880 *
1881 * Attempt to divine whether or not an RPC call reply carrying stale
1882 * attributes got scheduled after another call carrying updated ones.
1883 * Note also the check for wraparound of 'attr_gencount'
1884 *
1885 * The function returns '1' if it thinks the attributes in @fattr are
1886 * more recent than the ones cached in @inode. Otherwise it returns
1887 * the value '0'.
1888 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1889 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1890 const struct inode *inode)
1891 {
1892 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1893
1894 return (long)(fattr->gencount - attr_gencount) > 0 ||
1895 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1896 }
1897
1898 /**
1899 * nfs_inode_attrs_cmp_monotonic - compare attributes
1900 * @fattr: attributes
1901 * @inode: pointer to inode
1902 *
1903 * Attempt to divine whether or not an RPC call reply carrying stale
1904 * attributes got scheduled after another call carrying updated ones.
1905 *
1906 * We assume that the server observes monotonic semantics for
1907 * the change attribute, so a larger value means that the attributes in
1908 * @fattr are more recent, in which case the function returns the
1909 * value '1'.
1910 * A return value of '0' indicates no measurable change
1911 * A return value of '-1' means that the attributes in @inode are
1912 * more recent.
1913 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1914 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1915 const struct inode *inode)
1916 {
1917 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1918 if (diff > 0)
1919 return 1;
1920 return diff == 0 ? 0 : -1;
1921 }
1922
1923 /**
1924 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1925 * @fattr: attributes
1926 * @inode: pointer to inode
1927 *
1928 * Attempt to divine whether or not an RPC call reply carrying stale
1929 * attributes got scheduled after another call carrying updated ones.
1930 *
1931 * We assume that the server observes strictly monotonic semantics for
1932 * the change attribute, so a larger value means that the attributes in
1933 * @fattr are more recent, in which case the function returns the
1934 * value '1'.
1935 * A return value of '-1' means that the attributes in @inode are
1936 * more recent or unchanged.
1937 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1938 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1939 const struct inode *inode)
1940 {
1941 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1942 }
1943
1944 /**
1945 * nfs_inode_attrs_cmp - compare attributes
1946 * @fattr: attributes
1947 * @inode: pointer to inode
1948 *
1949 * This function returns '1' if it thinks the attributes in @fattr are
1950 * more recent than the ones cached in @inode. It returns '-1' if
1951 * the attributes in @inode are more recent than the ones in @fattr,
1952 * and it returns 0 if not sure.
1953 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1954 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1955 const struct inode *inode)
1956 {
1957 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1958 return 1;
1959 switch (NFS_SERVER(inode)->change_attr_type) {
1960 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1961 break;
1962 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1963 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1964 break;
1965 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1966 default:
1967 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1968 break;
1969 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1970 }
1971 return 0;
1972 }
1973
1974 /**
1975 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1976 * @fattr: attributes
1977 * @inode: pointer to inode
1978 *
1979 * Returns '1' if the last attribute update left the inode cached
1980 * attributes in a partially unrevalidated state, and @fattr
1981 * matches the change attribute of that partial update.
1982 * Otherwise returns '0'.
1983 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1984 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1985 const struct inode *inode)
1986 {
1987 const unsigned long check_valid =
1988 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1989 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1990 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1991 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME;
1992 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1993 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1994
1995 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1996 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
1997 (cache_validity & check_valid) != 0 &&
1998 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1999 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
2000 return 1;
2001 return 0;
2002 }
2003
nfs_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)2004 static void nfs_ooo_merge(struct nfs_inode *nfsi,
2005 u64 start, u64 end)
2006 {
2007 int i, cnt;
2008
2009 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
2010 /* No point merging anything */
2011 return;
2012
2013 if (!nfsi->ooo) {
2014 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
2015 if (!nfsi->ooo) {
2016 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2017 return;
2018 }
2019 nfsi->ooo->cnt = 0;
2020 }
2021
2022 /* add this range, merging if possible */
2023 cnt = nfsi->ooo->cnt;
2024 for (i = 0; i < cnt; i++) {
2025 if (end == nfsi->ooo->gap[i].start)
2026 end = nfsi->ooo->gap[i].end;
2027 else if (start == nfsi->ooo->gap[i].end)
2028 start = nfsi->ooo->gap[i].start;
2029 else
2030 continue;
2031 /* Remove 'i' from table and loop to insert the new range */
2032 cnt -= 1;
2033 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
2034 i = -1;
2035 }
2036 if (start != end) {
2037 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
2038 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2039 kfree(nfsi->ooo);
2040 nfsi->ooo = NULL;
2041 return;
2042 }
2043 nfsi->ooo->gap[cnt].start = start;
2044 nfsi->ooo->gap[cnt].end = end;
2045 cnt += 1;
2046 }
2047 nfsi->ooo->cnt = cnt;
2048 }
2049
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)2050 static void nfs_ooo_record(struct nfs_inode *nfsi,
2051 struct nfs_fattr *fattr)
2052 {
2053 /* This reply was out-of-order, so record in the
2054 * pre/post change id, possibly cancelling
2055 * gaps created when iversion was jumpped forward.
2056 */
2057 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
2058 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
2059 nfs_ooo_merge(nfsi,
2060 fattr->change_attr,
2061 fattr->pre_change_attr);
2062 }
2063
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)2064 static int nfs_refresh_inode_locked(struct inode *inode,
2065 struct nfs_fattr *fattr)
2066 {
2067 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2068 int ret = 0;
2069
2070 trace_nfs_refresh_inode_enter(inode);
2071
2072 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
2073 ret = nfs_update_inode(inode, fattr);
2074 else {
2075 nfs_ooo_record(NFS_I(inode), fattr);
2076
2077 if (attr_cmp == 0)
2078 ret = nfs_check_inode_attributes(inode, fattr);
2079 }
2080
2081 trace_nfs_refresh_inode_exit(inode, ret);
2082 return ret;
2083 }
2084
2085 /**
2086 * nfs_refresh_inode - try to update the inode attribute cache
2087 * @inode: pointer to inode
2088 * @fattr: updated attributes
2089 *
2090 * Check that an RPC call that returned attributes has not overlapped with
2091 * other recent updates of the inode metadata, then decide whether it is
2092 * safe to do a full update of the inode attributes, or whether just to
2093 * call nfs_check_inode_attributes.
2094 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)2095 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
2096 {
2097 int status;
2098
2099 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2100 return 0;
2101 spin_lock(&inode->i_lock);
2102 status = nfs_refresh_inode_locked(inode, fattr);
2103 spin_unlock(&inode->i_lock);
2104
2105 return status;
2106 }
2107 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
2108
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)2109 static int nfs_post_op_update_inode_locked(struct inode *inode,
2110 struct nfs_fattr *fattr, unsigned int invalid)
2111 {
2112 if (S_ISDIR(inode->i_mode))
2113 invalid |= NFS_INO_INVALID_DATA;
2114 nfs_set_cache_invalid(inode, invalid);
2115 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2116 return 0;
2117 return nfs_refresh_inode_locked(inode, fattr);
2118 }
2119
2120 /**
2121 * nfs_post_op_update_inode - try to update the inode attribute cache
2122 * @inode: pointer to inode
2123 * @fattr: updated attributes
2124 *
2125 * After an operation that has changed the inode metadata, mark the
2126 * attribute cache as being invalid, then try to update it.
2127 *
2128 * NB: if the server didn't return any post op attributes, this
2129 * function will force the retrieval of attributes before the next
2130 * NFS request. Thus it should be used only for operations that
2131 * are expected to change one or more attributes, to avoid
2132 * unnecessary NFS requests and trips through nfs_update_inode().
2133 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)2134 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2135 {
2136 int status;
2137
2138 spin_lock(&inode->i_lock);
2139 nfs_fattr_set_barrier(fattr);
2140 status = nfs_post_op_update_inode_locked(inode, fattr,
2141 NFS_INO_INVALID_CHANGE
2142 | NFS_INO_INVALID_CTIME
2143 | NFS_INO_REVAL_FORCED);
2144 spin_unlock(&inode->i_lock);
2145
2146 return status;
2147 }
2148 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
2149
2150 /**
2151 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
2152 * @inode: pointer to inode
2153 * @fattr: updated attributes
2154 *
2155 * After an operation that has changed the inode metadata, mark the
2156 * attribute cache as being invalid, then try to update it. Fake up
2157 * weak cache consistency data, if none exist.
2158 *
2159 * This function is mainly designed to be used by the ->write_done() functions.
2160 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)2161 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
2162 {
2163 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2164 int status;
2165
2166 /* Don't do a WCC update if these attributes are already stale */
2167 if (attr_cmp < 0)
2168 return 0;
2169 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
2170 /* Record the pre/post change info before clearing PRECHANGE */
2171 nfs_ooo_record(NFS_I(inode), fattr);
2172 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
2173 | NFS_ATTR_FATTR_PRESIZE
2174 | NFS_ATTR_FATTR_PREMTIME
2175 | NFS_ATTR_FATTR_PRECTIME);
2176 goto out_noforce;
2177 }
2178 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2179 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
2180 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
2181 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
2182 }
2183 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
2184 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2185 fattr->pre_ctime = inode_get_ctime(inode);
2186 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2187 }
2188 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2189 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2190 fattr->pre_mtime = inode_get_mtime(inode);
2191 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2192 }
2193 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2194 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2195 fattr->pre_size = i_size_read(inode);
2196 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2197 }
2198 out_noforce:
2199 status = nfs_post_op_update_inode_locked(inode, fattr,
2200 NFS_INO_INVALID_CHANGE
2201 | NFS_INO_INVALID_CTIME
2202 | NFS_INO_INVALID_MTIME
2203 | NFS_INO_INVALID_BLOCKS);
2204 return status;
2205 }
2206
2207 /**
2208 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2209 * @inode: pointer to inode
2210 * @fattr: updated attributes
2211 *
2212 * After an operation that has changed the inode metadata, mark the
2213 * attribute cache as being invalid, then try to update it. Fake up
2214 * weak cache consistency data, if none exist.
2215 *
2216 * This function is mainly designed to be used by the ->write_done() functions.
2217 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2218 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2219 {
2220 int status;
2221
2222 spin_lock(&inode->i_lock);
2223 nfs_fattr_set_barrier(fattr);
2224 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2225 spin_unlock(&inode->i_lock);
2226 return status;
2227 }
2228 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2229
2230
2231 /*
2232 * Many nfs protocol calls return the new file attributes after
2233 * an operation. Here we update the inode to reflect the state
2234 * of the server's inode.
2235 *
2236 * This is a bit tricky because we have to make sure all dirty pages
2237 * have been sent off to the server before calling invalidate_inode_pages.
2238 * To make sure no other process adds more write requests while we try
2239 * our best to flush them, we make them sleep during the attribute refresh.
2240 *
2241 * A very similar scenario holds for the dir cache.
2242 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2243 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2244 {
2245 struct nfs_server *server = NFS_SERVER(inode);
2246 struct nfs_inode *nfsi = NFS_I(inode);
2247 loff_t cur_isize, new_isize;
2248 u64 fattr_supported = server->fattr_valid;
2249 unsigned long invalid = 0;
2250 unsigned long now = jiffies;
2251 unsigned long save_cache_validity;
2252 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2253 bool cache_revalidated = true;
2254 bool attr_changed = false;
2255 bool have_delegation;
2256
2257 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%llx)\n",
2258 __func__, inode->i_sb->s_id, inode->i_ino,
2259 nfs_display_fhandle_hash(NFS_FH(inode)),
2260 icount_read(inode), fattr->valid);
2261
2262 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2263 /* Only a mounted-on-fileid? Just exit */
2264 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2265 return 0;
2266 /* Has the inode gone and changed behind our back? */
2267 } else if (nfsi->fileid != fattr->fileid) {
2268 /* Is this perhaps the mounted-on fileid? */
2269 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2270 nfsi->fileid == fattr->mounted_on_fileid)
2271 return 0;
2272 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2273 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2274 NFS_SERVER(inode)->nfs_client->cl_hostname,
2275 inode->i_sb->s_id, (long long)nfsi->fileid,
2276 (long long)fattr->fileid);
2277 goto out_err;
2278 }
2279
2280 /*
2281 * Make sure the inode's type hasn't changed.
2282 */
2283 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2284 /*
2285 * Big trouble! The inode has become a different object.
2286 */
2287 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2288 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2289 goto out_err;
2290 }
2291
2292 /* Update the fsid? */
2293 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2294 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2295 !IS_AUTOMOUNT(inode))
2296 server->fsid = fattr->fsid;
2297
2298 /* Save the delegation state before clearing cache_validity */
2299 have_delegation = nfs_have_delegated_attributes(inode);
2300
2301 /*
2302 * Update the read time so we don't revalidate too often.
2303 */
2304 nfsi->read_cache_jiffies = fattr->time_start;
2305
2306 /* Fix up any delegated attributes in the struct nfs_fattr */
2307 nfs_fattr_fixup_delegated(inode, fattr);
2308
2309 save_cache_validity = nfsi->cache_validity;
2310 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2311 | NFS_INO_INVALID_ATIME
2312 | NFS_INO_REVAL_FORCED
2313 | NFS_INO_INVALID_BLOCKS);
2314
2315 /* Do atomic weak cache consistency updates */
2316 nfs_wcc_update_inode(inode, fattr);
2317
2318 if (pnfs_layoutcommit_outstanding(inode)) {
2319 nfsi->cache_validity |=
2320 save_cache_validity &
2321 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2322 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2323 NFS_INO_INVALID_BLOCKS);
2324 cache_revalidated = false;
2325 }
2326
2327 /* More cache consistency checks */
2328 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2329 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2330 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2331 /* There is one remaining gap that hasn't been
2332 * merged into iversion - do that now.
2333 */
2334 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2335 kfree(nfsi->ooo);
2336 nfsi->ooo = NULL;
2337 }
2338 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2339 /* Could it be a race with writeback? */
2340 if (!(have_writers || have_delegation)) {
2341 invalid |= NFS_INO_INVALID_DATA
2342 | NFS_INO_INVALID_ACCESS
2343 | NFS_INO_INVALID_ACL
2344 | NFS_INO_INVALID_XATTR;
2345 /* Force revalidate of all attributes */
2346 save_cache_validity |= NFS_INO_INVALID_CTIME
2347 | NFS_INO_INVALID_MTIME
2348 | NFS_INO_INVALID_SIZE
2349 | NFS_INO_INVALID_BLOCKS
2350 | NFS_INO_INVALID_NLINK
2351 | NFS_INO_INVALID_MODE
2352 | NFS_INO_INVALID_OTHER
2353 | NFS_INO_INVALID_BTIME;
2354 if (S_ISDIR(inode->i_mode))
2355 nfs_force_lookup_revalidate(inode);
2356 attr_changed = true;
2357 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2358 inode->i_sb->s_id,
2359 inode->i_ino);
2360 } else if (!have_delegation) {
2361 nfs_ooo_record(nfsi, fattr);
2362 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2363 fattr->change_attr);
2364 }
2365 inode_set_iversion_raw(inode, fattr->change_attr);
2366 }
2367 } else {
2368 nfsi->cache_validity |=
2369 save_cache_validity & NFS_INO_INVALID_CHANGE;
2370 if (!have_delegation ||
2371 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2372 cache_revalidated = false;
2373 }
2374
2375 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2376 inode_set_mtime_to_ts(inode, fattr->mtime);
2377 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2378 nfsi->cache_validity |=
2379 save_cache_validity & NFS_INO_INVALID_MTIME;
2380
2381 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2382 inode_set_ctime_to_ts(inode, fattr->ctime);
2383 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2384 nfsi->cache_validity |=
2385 save_cache_validity & NFS_INO_INVALID_CTIME;
2386
2387 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
2388 nfsi->btime = fattr->btime;
2389 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
2390 nfsi->cache_validity |=
2391 save_cache_validity & NFS_INO_INVALID_BTIME;
2392
2393 /* Check if our cached file size is stale */
2394 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2395 new_isize = nfs_size_to_loff_t(fattr->size);
2396 cur_isize = i_size_read(inode);
2397 if (new_isize != cur_isize && !have_delegation) {
2398 /* Do we perhaps have any outstanding writes, or has
2399 * the file grown beyond our last write? */
2400 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2401 trace_nfs_size_update(inode, new_isize);
2402 i_size_write(inode, new_isize);
2403 if (!have_writers)
2404 invalid |= NFS_INO_INVALID_DATA;
2405 }
2406 }
2407 if (new_isize == 0 &&
2408 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2409 NFS_ATTR_FATTR_BLOCKS_USED))) {
2410 fattr->du.nfs3.used = 0;
2411 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2412 }
2413 } else
2414 nfsi->cache_validity |=
2415 save_cache_validity & NFS_INO_INVALID_SIZE;
2416
2417 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2418 inode_set_atime_to_ts(inode, fattr->atime);
2419 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2420 nfsi->cache_validity |=
2421 save_cache_validity & NFS_INO_INVALID_ATIME;
2422
2423 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2424 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2425 umode_t newmode = inode->i_mode & S_IFMT;
2426 newmode |= fattr->mode & S_IALLUGO;
2427 inode->i_mode = newmode;
2428 invalid |= NFS_INO_INVALID_ACCESS
2429 | NFS_INO_INVALID_ACL;
2430 }
2431 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2432 nfsi->cache_validity |=
2433 save_cache_validity & NFS_INO_INVALID_MODE;
2434
2435 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2436 if (!uid_eq(inode->i_uid, fattr->uid)) {
2437 invalid |= NFS_INO_INVALID_ACCESS
2438 | NFS_INO_INVALID_ACL;
2439 inode->i_uid = fattr->uid;
2440 }
2441 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2442 nfsi->cache_validity |=
2443 save_cache_validity & NFS_INO_INVALID_OTHER;
2444
2445 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2446 if (!gid_eq(inode->i_gid, fattr->gid)) {
2447 invalid |= NFS_INO_INVALID_ACCESS
2448 | NFS_INO_INVALID_ACL;
2449 inode->i_gid = fattr->gid;
2450 }
2451 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2452 nfsi->cache_validity |=
2453 save_cache_validity & NFS_INO_INVALID_OTHER;
2454
2455 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2456 if (inode->i_nlink != fattr->nlink)
2457 set_nlink(inode, fattr->nlink);
2458 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2459 nfsi->cache_validity |=
2460 save_cache_validity & NFS_INO_INVALID_NLINK;
2461
2462 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2463 /*
2464 * report the blocks in 512byte units
2465 */
2466 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2467 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2468 nfsi->cache_validity |=
2469 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2470
2471 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2472 inode->i_blocks = fattr->du.nfs2.blocks;
2473 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2474 nfsi->cache_validity |=
2475 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2476
2477 /* Update attrtimeo value if we're out of the unstable period */
2478 if (attr_changed) {
2479 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2480 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2481 nfsi->attrtimeo_timestamp = now;
2482 /* Set barrier to be more recent than all outstanding updates */
2483 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2484 } else {
2485 if (cache_revalidated) {
2486 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2487 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2488 nfsi->attrtimeo <<= 1;
2489 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2490 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2491 }
2492 nfsi->attrtimeo_timestamp = now;
2493 }
2494 /* Set the barrier to be more recent than this fattr */
2495 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2496 nfsi->attr_gencount = fattr->gencount;
2497 }
2498
2499 /* Don't invalidate the data if we were to blame */
2500 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2501 || S_ISLNK(inode->i_mode)))
2502 invalid &= ~NFS_INO_INVALID_DATA;
2503 nfs_set_cache_invalid(inode, invalid);
2504
2505 return 0;
2506 out_err:
2507 /*
2508 * No need to worry about unhashing the dentry, as the
2509 * lookup validation will know that the inode is bad.
2510 * (But we fall through to invalidate the caches.)
2511 */
2512 nfs_set_inode_stale_locked(inode);
2513 return -ESTALE;
2514 }
2515
nfs_alloc_inode(struct super_block * sb)2516 struct inode *nfs_alloc_inode(struct super_block *sb)
2517 {
2518 struct nfs_inode *nfsi;
2519 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2520 if (!nfsi)
2521 return NULL;
2522 nfsi->flags = 0UL;
2523 nfsi->cache_validity = 0UL;
2524 nfsi->ooo = NULL;
2525 #if IS_ENABLED(CONFIG_NFS_V4)
2526 nfsi->nfs4_acl = NULL;
2527 #endif /* CONFIG_NFS_V4 */
2528 #ifdef CONFIG_NFS_V4_2
2529 nfsi->xattr_cache = NULL;
2530 #endif
2531 nfs_netfs_inode_init(nfsi);
2532
2533 return &nfsi->vfs_inode;
2534 }
2535 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2536
nfs_free_inode(struct inode * inode)2537 void nfs_free_inode(struct inode *inode)
2538 {
2539 kfree(NFS_I(inode)->ooo);
2540 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2541 }
2542 EXPORT_SYMBOL_GPL(nfs_free_inode);
2543
nfs4_init_once(struct nfs_inode * nfsi)2544 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2545 {
2546 #if IS_ENABLED(CONFIG_NFS_V4)
2547 INIT_LIST_HEAD(&nfsi->open_states);
2548 nfsi->delegation = NULL;
2549 init_rwsem(&nfsi->rwsem);
2550 nfsi->layout = NULL;
2551 #endif
2552 }
2553
init_once(void * foo)2554 static void init_once(void *foo)
2555 {
2556 struct nfs_inode *nfsi = foo;
2557
2558 inode_init_once(&nfsi->vfs_inode);
2559 INIT_LIST_HEAD(&nfsi->open_files);
2560 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2561 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2562 nfs4_init_once(nfsi);
2563 }
2564
nfs_init_inodecache(void)2565 static int __init nfs_init_inodecache(void)
2566 {
2567 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2568 sizeof(struct nfs_inode),
2569 0, (SLAB_RECLAIM_ACCOUNT|
2570 SLAB_ACCOUNT),
2571 init_once);
2572 if (nfs_inode_cachep == NULL)
2573 return -ENOMEM;
2574
2575 return 0;
2576 }
2577
nfs_destroy_inodecache(void)2578 static void nfs_destroy_inodecache(void)
2579 {
2580 /*
2581 * Make sure all delayed rcu free inodes are flushed before we
2582 * destroy cache.
2583 */
2584 rcu_barrier();
2585 kmem_cache_destroy(nfs_inode_cachep);
2586 }
2587
2588 struct workqueue_struct *nfslocaliod_workqueue;
2589 struct workqueue_struct *nfsiod_workqueue;
2590 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2591
2592 /*
2593 * Destroy the nfsiod workqueues
2594 */
nfsiod_stop(void)2595 static void nfsiod_stop(void)
2596 {
2597 struct workqueue_struct *wq;
2598
2599 wq = nfsiod_workqueue;
2600 if (wq != NULL) {
2601 nfsiod_workqueue = NULL;
2602 destroy_workqueue(wq);
2603 }
2604 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2605 wq = nfslocaliod_workqueue;
2606 if (wq != NULL) {
2607 nfslocaliod_workqueue = NULL;
2608 destroy_workqueue(wq);
2609 }
2610 #endif /* CONFIG_NFS_LOCALIO */
2611 }
2612
2613 /*
2614 * Start the nfsiod workqueues
2615 */
nfsiod_start(void)2616 static int nfsiod_start(void)
2617 {
2618 dprintk("RPC: creating workqueue nfsiod\n");
2619 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2620 if (nfsiod_workqueue == NULL)
2621 return -ENOMEM;
2622 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2623 /*
2624 * localio writes need to use a normal (non-memreclaim) workqueue.
2625 * When we start getting low on space, XFS goes and calls flush_work() on
2626 * a non-memreclaim work queue, which causes a priority inversion problem.
2627 */
2628 dprintk("RPC: creating workqueue nfslocaliod\n");
2629 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0);
2630 if (unlikely(nfslocaliod_workqueue == NULL)) {
2631 nfsiod_stop();
2632 return -ENOMEM;
2633 }
2634 #endif /* CONFIG_NFS_LOCALIO */
2635 return 0;
2636 }
2637
2638 unsigned int nfs_net_id;
2639 EXPORT_SYMBOL_GPL(nfs_net_id);
2640
nfs_net_init(struct net * net)2641 static int nfs_net_init(struct net *net)
2642 {
2643 struct nfs_net *nn = net_generic(net, nfs_net_id);
2644 int err;
2645
2646 nfs_clients_init(net);
2647
2648 if (!rpc_proc_register(net, &nn->rpcstats)) {
2649 err = -ENOMEM;
2650 goto err_proc_rpc;
2651 }
2652
2653 err = nfs_fs_proc_net_init(net);
2654 if (err)
2655 goto err_proc_nfs;
2656
2657 return 0;
2658
2659 err_proc_nfs:
2660 rpc_proc_unregister(net, "nfs");
2661 err_proc_rpc:
2662 nfs_clients_exit(net);
2663 return err;
2664 }
2665
nfs_net_exit(struct net * net)2666 static void nfs_net_exit(struct net *net)
2667 {
2668 rpc_proc_unregister(net, "nfs");
2669 nfs_fs_proc_net_exit(net);
2670 nfs_clients_exit(net);
2671 }
2672
2673 static struct pernet_operations nfs_net_ops = {
2674 .init = nfs_net_init,
2675 .exit = nfs_net_exit,
2676 .id = &nfs_net_id,
2677 .size = sizeof(struct nfs_net),
2678 };
2679
2680 #ifdef CONFIG_KEYS
2681 static struct key *nfs_keyring;
2682
nfs_init_keyring(void)2683 static int __init nfs_init_keyring(void)
2684 {
2685 nfs_keyring = keyring_alloc(".nfs",
2686 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
2687 current_cred(),
2688 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
2689 (KEY_USR_ALL & ~KEY_USR_SETATTR),
2690 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
2691 return PTR_ERR_OR_ZERO(nfs_keyring);
2692 }
2693
nfs_exit_keyring(void)2694 static void nfs_exit_keyring(void)
2695 {
2696 key_put(nfs_keyring);
2697 }
2698 #else
nfs_init_keyring(void)2699 static inline int nfs_init_keyring(void)
2700 {
2701 return 0;
2702 }
2703
nfs_exit_keyring(void)2704 static inline void nfs_exit_keyring(void)
2705 {
2706 }
2707 #endif /* CONFIG_KEYS */
2708
2709 /*
2710 * Initialize NFS
2711 */
init_nfs_fs(void)2712 static int __init init_nfs_fs(void)
2713 {
2714 int err;
2715
2716 err = nfs_init_keyring();
2717 if (err)
2718 return err;
2719
2720 err = nfs_sysfs_init();
2721 if (err < 0)
2722 goto out10;
2723
2724 err = register_pernet_subsys(&nfs_net_ops);
2725 if (err < 0)
2726 goto out9;
2727
2728 err = nfsiod_start();
2729 if (err)
2730 goto out7;
2731
2732 err = nfs_fs_proc_init();
2733 if (err)
2734 goto out6;
2735
2736 err = nfs_init_nfspagecache();
2737 if (err)
2738 goto out5;
2739
2740 err = nfs_init_inodecache();
2741 if (err)
2742 goto out4;
2743
2744 err = nfs_init_readpagecache();
2745 if (err)
2746 goto out3;
2747
2748 err = nfs_init_writepagecache();
2749 if (err)
2750 goto out2;
2751
2752 err = nfs_init_directcache();
2753 if (err)
2754 goto out1;
2755
2756 err = register_nfs_fs();
2757 if (err)
2758 goto out0;
2759
2760 return 0;
2761 out0:
2762 nfs_destroy_directcache();
2763 out1:
2764 nfs_destroy_writepagecache();
2765 out2:
2766 nfs_destroy_readpagecache();
2767 out3:
2768 nfs_destroy_inodecache();
2769 out4:
2770 nfs_destroy_nfspagecache();
2771 out5:
2772 nfs_fs_proc_exit();
2773 out6:
2774 nfsiod_stop();
2775 out7:
2776 unregister_pernet_subsys(&nfs_net_ops);
2777 out9:
2778 nfs_sysfs_exit();
2779 out10:
2780 nfs_exit_keyring();
2781 return err;
2782 }
2783
exit_nfs_fs(void)2784 static void __exit exit_nfs_fs(void)
2785 {
2786 nfs_destroy_directcache();
2787 nfs_destroy_writepagecache();
2788 nfs_destroy_readpagecache();
2789 nfs_destroy_inodecache();
2790 nfs_destroy_nfspagecache();
2791 unregister_pernet_subsys(&nfs_net_ops);
2792 unregister_nfs_fs();
2793 nfs_fs_proc_exit();
2794 nfsiod_stop();
2795 nfs_sysfs_exit();
2796 nfs_exit_keyring();
2797 }
2798
2799 /* Not quite true; I just maintain it */
2800 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2801 MODULE_DESCRIPTION("NFS client support");
2802 MODULE_LICENSE("GPL");
2803 module_param(enable_ino64, bool, 0644);
2804
2805 module_init(init_nfs_fs)
2806 module_exit(exit_nfs_fs)
2807