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_state_read_once(inode) & 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;
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 (S_ISREG(inode->i_mode))
731 nfs_file_block_o_direct(NFS_I(inode));
732
733 oldsize = i_size_read(inode);
734 if (attr->ia_valid & ATTR_SIZE) {
735 BUG_ON(!S_ISREG(inode->i_mode));
736
737 error = inode_newsize_ok(inode, attr->ia_size);
738 if (error)
739 return error;
740
741 if (attr->ia_size == oldsize)
742 attr->ia_valid &= ~ATTR_SIZE;
743 }
744
745 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
746 spin_lock(&inode->i_lock);
747 if (attr->ia_valid & ATTR_MTIME_SET) {
748 if (uid_eq(task_uid, owner_uid)) {
749 nfs_set_timestamps_to_ts(inode, attr);
750 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET|
751 ATTR_ATIME|ATTR_ATIME_SET);
752 }
753 } else {
754 nfs_update_timestamps(inode, attr->ia_valid);
755 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME);
756 }
757 spin_unlock(&inode->i_lock);
758 } else if (nfs_have_delegated_atime(inode) &&
759 attr->ia_valid & ATTR_ATIME &&
760 !(attr->ia_valid & ATTR_MTIME)) {
761 if (attr->ia_valid & ATTR_ATIME_SET) {
762 if (uid_eq(task_uid, owner_uid)) {
763 spin_lock(&inode->i_lock);
764 nfs_set_timestamps_to_ts(inode, attr);
765 spin_unlock(&inode->i_lock);
766 attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
767 }
768 } else {
769 nfs_update_delegated_atime(inode);
770 attr->ia_valid &= ~ATTR_ATIME;
771 }
772 }
773
774 /* Optimization: if the end result is no change, don't RPC */
775 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
776 return 0;
777
778 trace_nfs_setattr_enter(inode);
779
780 /* Write all dirty data */
781 if (S_ISREG(inode->i_mode))
782 nfs_sync_inode(inode);
783
784 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
785 if (fattr == NULL) {
786 error = -ENOMEM;
787 goto out;
788 }
789
790 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
791 if (error == 0) {
792 if (attr->ia_valid & ATTR_SIZE)
793 nfs_truncate_last_folio(inode->i_mapping, oldsize,
794 attr->ia_size);
795 error = nfs_refresh_inode(inode, fattr);
796 }
797 nfs_free_fattr(fattr);
798 out:
799 trace_nfs_setattr_exit(inode, error);
800 return error;
801 }
802 EXPORT_SYMBOL_GPL(nfs_setattr);
803
804 /**
805 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
806 * @inode: inode of the file used
807 * @offset: file offset to start truncating
808 *
809 * This is a copy of the common vmtruncate, but with the locking
810 * corrected to take into account the fact that NFS requires
811 * inode->i_size to be updated under the inode->i_lock.
812 * Note: must be called with inode->i_lock held!
813 */
nfs_vmtruncate(struct inode * inode,loff_t offset)814 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
815 {
816 int err;
817
818 err = inode_newsize_ok(inode, offset);
819 if (err)
820 goto out;
821
822 trace_nfs_size_truncate(inode, offset);
823 i_size_write(inode, offset);
824 /* Optimisation */
825 if (offset == 0) {
826 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
827 nfs_ooo_clear(NFS_I(inode));
828 }
829 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
830
831 spin_unlock(&inode->i_lock);
832 truncate_pagecache(inode, offset);
833 nfs_update_delegated_mtime_locked(inode);
834 spin_lock(&inode->i_lock);
835 out:
836 return err;
837 }
838
839 /**
840 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
841 * @inode: pointer to struct inode
842 * @attr: pointer to struct iattr
843 * @fattr: pointer to struct nfs_fattr
844 *
845 * Note: we do this in the *proc.c in order to ensure that
846 * it works for things like exclusive creates too.
847 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)848 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
849 struct nfs_fattr *fattr)
850 {
851 /* Barrier: bump the attribute generation count. */
852 nfs_fattr_set_barrier(fattr);
853
854 spin_lock(&inode->i_lock);
855 NFS_I(inode)->attr_gencount = fattr->gencount;
856 if ((attr->ia_valid & ATTR_SIZE) != 0) {
857 if (!nfs_have_delegated_mtime(inode))
858 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
859 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
860 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
861 nfs_vmtruncate(inode, attr->ia_size);
862 }
863 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
864 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
865 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
866 inode->i_mode & S_ISUID)
867 inode->i_mode &= ~S_ISUID;
868 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
869 inode->i_mode &= ~S_ISGID;
870 if ((attr->ia_valid & ATTR_MODE) != 0) {
871 int mode = attr->ia_mode & S_IALLUGO;
872 mode |= inode->i_mode & ~S_IALLUGO;
873 inode->i_mode = mode;
874 }
875 if ((attr->ia_valid & ATTR_UID) != 0)
876 inode->i_uid = attr->ia_uid;
877 if ((attr->ia_valid & ATTR_GID) != 0)
878 inode->i_gid = attr->ia_gid;
879 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
880 inode_set_ctime_to_ts(inode, fattr->ctime);
881 else
882 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
883 | NFS_INO_INVALID_CTIME);
884 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
885 | NFS_INO_INVALID_ACL);
886 }
887 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
888 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
889 | NFS_INO_INVALID_CTIME);
890 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
891 inode_set_atime_to_ts(inode, fattr->atime);
892 else if (attr->ia_valid & ATTR_ATIME_SET)
893 inode_set_atime_to_ts(inode, attr->ia_atime);
894 else
895 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
896
897 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
898 inode_set_ctime_to_ts(inode, fattr->ctime);
899 else
900 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
901 | NFS_INO_INVALID_CTIME);
902 }
903 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
904 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
905 | NFS_INO_INVALID_CTIME);
906 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
907 inode_set_mtime_to_ts(inode, fattr->mtime);
908 else if (attr->ia_valid & ATTR_MTIME_SET)
909 inode_set_mtime_to_ts(inode, attr->ia_mtime);
910 else
911 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
912
913 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
914 inode_set_ctime_to_ts(inode, fattr->ctime);
915 else
916 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
917 | NFS_INO_INVALID_CTIME);
918 }
919 if (fattr->valid)
920 nfs_update_inode(inode, fattr);
921 spin_unlock(&inode->i_lock);
922 }
923 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
924
925 /*
926 * Don't request help from readdirplus if the file is being written to,
927 * or if attribute caching is turned off
928 */
nfs_getattr_readdirplus_enable(const struct inode * inode)929 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
930 {
931 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
932 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
933 }
934
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)935 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
936 {
937 if (!IS_ROOT(dentry)) {
938 struct dentry *parent = dget_parent(dentry);
939 nfs_readdir_record_entry_cache_miss(d_inode(parent));
940 dput(parent);
941 }
942 }
943
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)944 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
945 {
946 if (!IS_ROOT(dentry)) {
947 struct dentry *parent = dget_parent(dentry);
948 nfs_readdir_record_entry_cache_hit(d_inode(parent));
949 dput(parent);
950 }
951 }
952
nfs_get_valid_attrmask(struct inode * inode)953 static u32 nfs_get_valid_attrmask(struct inode *inode)
954 {
955 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid;
956 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
957 u32 reply_mask = STATX_INO | STATX_TYPE;
958
959 if (!(cache_validity & NFS_INO_INVALID_ATIME))
960 reply_mask |= STATX_ATIME;
961 if (!(cache_validity & NFS_INO_INVALID_CTIME))
962 reply_mask |= STATX_CTIME;
963 if (!(cache_validity & NFS_INO_INVALID_MTIME))
964 reply_mask |= STATX_MTIME;
965 if (!(cache_validity & NFS_INO_INVALID_SIZE))
966 reply_mask |= STATX_SIZE;
967 if (!(cache_validity & NFS_INO_INVALID_NLINK))
968 reply_mask |= STATX_NLINK;
969 if (!(cache_validity & NFS_INO_INVALID_MODE))
970 reply_mask |= STATX_MODE;
971 if (!(cache_validity & NFS_INO_INVALID_OTHER))
972 reply_mask |= STATX_UID | STATX_GID;
973 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
974 reply_mask |= STATX_BLOCKS;
975 if (!(cache_validity & NFS_INO_INVALID_BTIME) &&
976 (fattr_valid & NFS_ATTR_FATTR_BTIME))
977 reply_mask |= STATX_BTIME;
978 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
979 reply_mask |= STATX_CHANGE_COOKIE;
980 return reply_mask;
981 }
982
nfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)983 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
984 struct kstat *stat, u32 request_mask, unsigned int query_flags)
985 {
986 struct inode *inode = d_inode(path->dentry);
987 struct nfs_server *server = NFS_SERVER(inode);
988 u64 fattr_valid = server->fattr_valid;
989 unsigned long cache_validity;
990 int err = 0;
991 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
992 bool do_update = false;
993 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
994
995 trace_nfs_getattr_enter(inode);
996
997 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
998 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
999 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME |
1000 STATX_CHANGE_COOKIE;
1001
1002 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME))
1003 request_mask &= ~STATX_BTIME;
1004
1005 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
1006 if (readdirplus_enabled)
1007 nfs_readdirplus_parent_cache_hit(path->dentry);
1008 goto out_no_revalidate;
1009 }
1010
1011 /* Flush out writes to the server in order to update c/mtime/version. */
1012 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
1013 S_ISREG(inode->i_mode)) {
1014 if (nfs_have_delegated_mtime(inode))
1015 filemap_fdatawrite(inode->i_mapping);
1016 else
1017 filemap_write_and_wait(inode->i_mapping);
1018 }
1019
1020 /*
1021 * We may force a getattr if the user cares about atime.
1022 *
1023 * Note that we only have to check the vfsmount flags here:
1024 * - NFS always sets S_NOATIME by so checking it would give a
1025 * bogus result
1026 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
1027 * no point in checking those.
1028 */
1029 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
1030 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1031 request_mask &= ~STATX_ATIME;
1032
1033 /* Is the user requesting attributes that might need revalidation? */
1034 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
1035 STATX_MTIME|STATX_UID|STATX_GID|
1036 STATX_SIZE|STATX_BLOCKS|STATX_BTIME|
1037 STATX_CHANGE_COOKIE)))
1038 goto out_no_revalidate;
1039
1040 /* Check whether the cached attributes are stale */
1041 do_update |= force_sync || nfs_attribute_cache_expired(inode);
1042 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
1043 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
1044 if (request_mask & STATX_ATIME)
1045 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
1046 if (request_mask & STATX_CTIME)
1047 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
1048 if (request_mask & STATX_MTIME)
1049 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
1050 if (request_mask & STATX_SIZE)
1051 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
1052 if (request_mask & STATX_NLINK)
1053 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
1054 if (request_mask & STATX_MODE)
1055 do_update |= cache_validity & NFS_INO_INVALID_MODE;
1056 if (request_mask & (STATX_UID | STATX_GID))
1057 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
1058 if (request_mask & STATX_BLOCKS)
1059 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
1060 if (request_mask & STATX_BTIME)
1061 do_update |= cache_validity & NFS_INO_INVALID_BTIME;
1062
1063 if (do_update) {
1064 if (readdirplus_enabled)
1065 nfs_readdirplus_parent_cache_miss(path->dentry);
1066 err = __nfs_revalidate_inode(server, inode);
1067 if (err)
1068 goto out;
1069 } else if (readdirplus_enabled)
1070 nfs_readdirplus_parent_cache_hit(path->dentry);
1071 out_no_revalidate:
1072 /* Only return attributes that were revalidated. */
1073 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
1074
1075 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1076 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
1077 stat->change_cookie = inode_peek_iversion_raw(inode);
1078 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
1079 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
1080 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
1081 if (S_ISDIR(inode->i_mode))
1082 stat->blksize = NFS_SERVER(inode)->dtsize;
1083 stat->btime = NFS_I(inode)->btime;
1084
1085 /* Special handling for STATX_DIOALIGN and STATX_DIO_READ_ALIGN
1086 * - NFS doesn't have DIO alignment constraints, avoid getting
1087 * these DIO attrs from remote and just respond with most
1088 * accommodating limits (so client will issue supported DIO).
1089 * - this is unintuitive, but the most coarse-grained
1090 * dio_offset_align is the most accommodating.
1091 */
1092 if ((request_mask & (STATX_DIOALIGN | STATX_DIO_READ_ALIGN)) &&
1093 S_ISREG(inode->i_mode)) {
1094 stat->result_mask |= STATX_DIOALIGN | STATX_DIO_READ_ALIGN;
1095 stat->dio_mem_align = 4; /* 4-byte alignment */
1096 stat->dio_offset_align = PAGE_SIZE;
1097 stat->dio_read_offset_align = stat->dio_offset_align;
1098 }
1099 out:
1100 trace_nfs_getattr_exit(inode, err);
1101 return err;
1102 }
1103 EXPORT_SYMBOL_GPL(nfs_getattr);
1104
nfs_init_lock_context(struct nfs_lock_context * l_ctx)1105 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
1106 {
1107 refcount_set(&l_ctx->count, 1);
1108 l_ctx->lockowner = current->files;
1109 INIT_LIST_HEAD(&l_ctx->list);
1110 atomic_set(&l_ctx->io_count, 0);
1111 }
1112
__nfs_find_lock_context(struct nfs_open_context * ctx)1113 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
1114 {
1115 struct nfs_lock_context *pos;
1116
1117 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
1118 if (pos->lockowner != current->files)
1119 continue;
1120 if (refcount_inc_not_zero(&pos->count))
1121 return pos;
1122 }
1123 return NULL;
1124 }
1125
nfs_get_lock_context(struct nfs_open_context * ctx)1126 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
1127 {
1128 struct nfs_lock_context *res, *new = NULL;
1129 struct inode *inode = d_inode(ctx->dentry);
1130
1131 rcu_read_lock();
1132 res = __nfs_find_lock_context(ctx);
1133 rcu_read_unlock();
1134 if (res == NULL) {
1135 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
1136 if (new == NULL)
1137 return ERR_PTR(-ENOMEM);
1138 nfs_init_lock_context(new);
1139 spin_lock(&inode->i_lock);
1140 res = __nfs_find_lock_context(ctx);
1141 if (res == NULL) {
1142 new->open_context = get_nfs_open_context(ctx);
1143 if (new->open_context) {
1144 list_add_tail_rcu(&new->list,
1145 &ctx->lock_context.list);
1146 res = new;
1147 new = NULL;
1148 } else
1149 res = ERR_PTR(-EBADF);
1150 }
1151 spin_unlock(&inode->i_lock);
1152 kfree(new);
1153 }
1154 return res;
1155 }
1156 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
1157
nfs_put_lock_context(struct nfs_lock_context * l_ctx)1158 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
1159 {
1160 struct nfs_open_context *ctx = l_ctx->open_context;
1161 struct inode *inode = d_inode(ctx->dentry);
1162
1163 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
1164 return;
1165 list_del_rcu(&l_ctx->list);
1166 spin_unlock(&inode->i_lock);
1167 put_nfs_open_context(ctx);
1168 kfree_rcu(l_ctx, rcu_head);
1169 }
1170 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
1171
1172 /**
1173 * nfs_close_context - Common close_context() routine NFSv2/v3
1174 * @ctx: pointer to context
1175 * @is_sync: is this a synchronous close
1176 *
1177 * Ensure that the attributes are up to date if we're mounted
1178 * with close-to-open semantics and we have cached data that will
1179 * need to be revalidated on open.
1180 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1181 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1182 {
1183 struct nfs_inode *nfsi;
1184 struct inode *inode;
1185
1186 if (!(ctx->mode & FMODE_WRITE))
1187 return;
1188 if (!is_sync)
1189 return;
1190 inode = d_inode(ctx->dentry);
1191 if (nfs_have_read_or_write_delegation(inode))
1192 return;
1193 nfsi = NFS_I(inode);
1194 if (inode->i_mapping->nrpages == 0)
1195 return;
1196 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1197 return;
1198 if (!list_empty(&nfsi->open_files))
1199 return;
1200 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1201 return;
1202 nfs_revalidate_inode(inode,
1203 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1204 }
1205 EXPORT_SYMBOL_GPL(nfs_close_context);
1206
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1207 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1208 fmode_t f_mode,
1209 struct file *filp)
1210 {
1211 struct nfs_open_context *ctx;
1212
1213 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1214 if (!ctx)
1215 return ERR_PTR(-ENOMEM);
1216 nfs_sb_active(dentry->d_sb);
1217 ctx->dentry = dget(dentry);
1218 if (filp)
1219 ctx->cred = get_cred(filp->f_cred);
1220 else
1221 ctx->cred = get_current_cred();
1222 rcu_assign_pointer(ctx->ll_cred, NULL);
1223 ctx->state = NULL;
1224 ctx->mode = f_mode;
1225 ctx->flags = 0;
1226 ctx->error = 0;
1227 ctx->flock_owner = (fl_owner_t)filp;
1228 nfs_init_lock_context(&ctx->lock_context);
1229 ctx->lock_context.open_context = ctx;
1230 INIT_LIST_HEAD(&ctx->list);
1231 ctx->mdsthreshold = NULL;
1232 nfs_localio_file_init(&ctx->nfl);
1233
1234 return ctx;
1235 }
1236 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1237
get_nfs_open_context(struct nfs_open_context * ctx)1238 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1239 {
1240 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1241 return ctx;
1242 return NULL;
1243 }
1244 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1245
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1246 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1247 {
1248 struct inode *inode = d_inode(ctx->dentry);
1249 struct super_block *sb = ctx->dentry->d_sb;
1250
1251 if (!refcount_dec_and_test(&ctx->lock_context.count))
1252 return;
1253 if (!list_empty(&ctx->list)) {
1254 spin_lock(&inode->i_lock);
1255 list_del_rcu(&ctx->list);
1256 spin_unlock(&inode->i_lock);
1257 }
1258 if (inode != NULL)
1259 NFS_PROTO(inode)->close_context(ctx, is_sync);
1260 put_cred(ctx->cred);
1261 dput(ctx->dentry);
1262 nfs_sb_deactive(sb);
1263 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1264 kfree(ctx->mdsthreshold);
1265 nfs_close_local_fh(&ctx->nfl);
1266 kfree_rcu(ctx, rcu_head);
1267 }
1268
put_nfs_open_context(struct nfs_open_context * ctx)1269 void put_nfs_open_context(struct nfs_open_context *ctx)
1270 {
1271 __put_nfs_open_context(ctx, 0);
1272 }
1273 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1274
put_nfs_open_context_sync(struct nfs_open_context * ctx)1275 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1276 {
1277 __put_nfs_open_context(ctx, 1);
1278 }
1279
1280 /*
1281 * Ensure that mmap has a recent RPC credential for use when writing out
1282 * shared pages
1283 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1284 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1285 {
1286 struct inode *inode = d_inode(ctx->dentry);
1287 struct nfs_inode *nfsi = NFS_I(inode);
1288
1289 spin_lock(&inode->i_lock);
1290 if (list_empty(&nfsi->open_files) &&
1291 nfs_ooo_test(nfsi))
1292 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1293 NFS_INO_REVAL_FORCED);
1294 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1295 spin_unlock(&inode->i_lock);
1296 }
1297 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1298
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1299 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1300 {
1301 filp->private_data = get_nfs_open_context(ctx);
1302 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1303 if (list_empty(&ctx->list))
1304 nfs_inode_attach_open_context(ctx);
1305 }
1306 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1307
1308 /*
1309 * Given an inode, search for an open context with the desired characteristics
1310 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1311 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1312 {
1313 struct nfs_inode *nfsi = NFS_I(inode);
1314 struct nfs_open_context *pos, *ctx = NULL;
1315
1316 rcu_read_lock();
1317 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1318 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1319 continue;
1320 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1321 continue;
1322 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1323 continue;
1324 ctx = get_nfs_open_context(pos);
1325 if (ctx)
1326 break;
1327 }
1328 rcu_read_unlock();
1329 return ctx;
1330 }
1331
nfs_file_clear_open_context(struct file * filp)1332 void nfs_file_clear_open_context(struct file *filp)
1333 {
1334 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1335
1336 if (ctx) {
1337 struct inode *inode = d_inode(ctx->dentry);
1338
1339 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1340 /*
1341 * We fatal error on write before. Try to writeback
1342 * every page again.
1343 */
1344 if (ctx->error < 0)
1345 invalidate_inode_pages2(inode->i_mapping);
1346 filp->private_data = NULL;
1347 put_nfs_open_context_sync(ctx);
1348 }
1349 }
1350
1351 /*
1352 * These allocate and release file read/write context information.
1353 */
nfs_open(struct inode * inode,struct file * filp)1354 int nfs_open(struct inode *inode, struct file *filp)
1355 {
1356 struct nfs_open_context *ctx;
1357
1358 ctx = alloc_nfs_open_context(file_dentry(filp),
1359 flags_to_mode(filp->f_flags), filp);
1360 if (IS_ERR(ctx))
1361 return PTR_ERR(ctx);
1362 nfs_file_set_open_context(filp, ctx);
1363 put_nfs_open_context(ctx);
1364 nfs_fscache_open_file(inode, filp);
1365 return 0;
1366 }
1367
1368 /*
1369 * This function is called whenever some part of NFS notices that
1370 * the cached attributes have to be refreshed.
1371 */
1372 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1373 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1374 {
1375 int status = -ESTALE;
1376 struct nfs_fattr *fattr = NULL;
1377 struct nfs_inode *nfsi = NFS_I(inode);
1378
1379 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1380 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1381
1382 trace_nfs_revalidate_inode_enter(inode);
1383
1384 if (is_bad_inode(inode))
1385 goto out;
1386 if (NFS_STALE(inode))
1387 goto out;
1388
1389 /* pNFS: Attributes aren't updated until we layoutcommit */
1390 if (S_ISREG(inode->i_mode)) {
1391 status = pnfs_sync_inode(inode, false);
1392 if (status)
1393 goto out;
1394 } else if (nfs_have_directory_delegation(inode)) {
1395 status = 0;
1396 goto out;
1397 }
1398
1399 status = -ENOMEM;
1400 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1401 if (fattr == NULL)
1402 goto out;
1403
1404 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1405
1406 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1407 if (status != 0) {
1408 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1409 inode->i_sb->s_id,
1410 (unsigned long long)NFS_FILEID(inode), status);
1411 switch (status) {
1412 case -ETIMEDOUT:
1413 /* A soft timeout occurred. Use cached information? */
1414 if (server->flags & NFS_MOUNT_SOFTREVAL)
1415 status = 0;
1416 break;
1417 case -ESTALE:
1418 if (!S_ISDIR(inode->i_mode))
1419 nfs_set_inode_stale(inode);
1420 else
1421 nfs_zap_caches(inode);
1422 }
1423 goto out;
1424 }
1425
1426 status = nfs_refresh_inode(inode, fattr);
1427 if (status) {
1428 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1429 inode->i_sb->s_id,
1430 (unsigned long long)NFS_FILEID(inode), status);
1431 goto out;
1432 }
1433
1434 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1435 nfs_zap_acl_cache(inode);
1436
1437 nfs_setsecurity(inode, fattr);
1438
1439 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1440 inode->i_sb->s_id,
1441 (unsigned long long)NFS_FILEID(inode));
1442
1443 out:
1444 nfs_free_fattr(fattr);
1445 trace_nfs_revalidate_inode_exit(inode, status);
1446 return status;
1447 }
1448
nfs_attribute_cache_expired(struct inode * inode)1449 int nfs_attribute_cache_expired(struct inode *inode)
1450 {
1451 if (nfs_have_delegated_attributes(inode))
1452 return 0;
1453 return nfs_attribute_timeout(inode);
1454 }
1455
1456 /**
1457 * nfs_revalidate_inode - Revalidate the inode attributes
1458 * @inode: pointer to inode struct
1459 * @flags: cache flags to check
1460 *
1461 * Updates inode attribute information by retrieving the data from the server.
1462 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1463 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1464 {
1465 if (!nfs_check_cache_invalid(inode, flags))
1466 return NFS_STALE(inode) ? -ESTALE : 0;
1467 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1468 }
1469 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1470
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1471 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1472 {
1473 int ret;
1474
1475 nfs_fscache_invalidate(inode, 0);
1476 if (mapping->nrpages != 0) {
1477 if (S_ISREG(inode->i_mode)) {
1478 ret = nfs_sync_mapping(mapping);
1479 if (ret < 0)
1480 return ret;
1481 }
1482 ret = invalidate_inode_pages2(mapping);
1483 if (ret < 0)
1484 return ret;
1485 }
1486 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1487
1488 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1489 inode->i_sb->s_id,
1490 (unsigned long long)NFS_FILEID(inode));
1491 return 0;
1492 }
1493
1494 /**
1495 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1496 * @mapping: pointer to mapping
1497 *
1498 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1499 */
nfs_clear_invalid_mapping(struct address_space * mapping)1500 int nfs_clear_invalid_mapping(struct address_space *mapping)
1501 {
1502 struct inode *inode = mapping->host;
1503 struct nfs_inode *nfsi = NFS_I(inode);
1504 unsigned long *bitlock = &nfsi->flags;
1505 int ret = 0;
1506
1507 /*
1508 * We must clear NFS_INO_INVALID_DATA first to ensure that
1509 * invalidations that come in while we're shooting down the mappings
1510 * are respected. But, that leaves a race window where one revalidator
1511 * can clear the flag, and then another checks it before the mapping
1512 * gets invalidated. Fix that by serializing access to this part of
1513 * the function.
1514 *
1515 * At the same time, we need to allow other tasks to see whether we
1516 * might be in the middle of invalidating the pages, so we only set
1517 * the bit lock here if it looks like we're going to be doing that.
1518 */
1519 for (;;) {
1520 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1521 nfs_wait_bit_killable,
1522 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1523 if (ret)
1524 goto out;
1525 smp_rmb(); /* pairs with smp_wmb() below */
1526 if (test_bit(NFS_INO_INVALIDATING, bitlock))
1527 continue;
1528 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */
1529 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA))
1530 goto out;
1531 /* Slow-path that double-checks with spinlock held */
1532 spin_lock(&inode->i_lock);
1533 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1534 spin_unlock(&inode->i_lock);
1535 continue;
1536 }
1537 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1538 break;
1539 spin_unlock(&inode->i_lock);
1540 goto out;
1541 }
1542
1543 set_bit(NFS_INO_INVALIDATING, bitlock);
1544 smp_wmb();
1545 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1546 nfs_ooo_clear(nfsi);
1547 spin_unlock(&inode->i_lock);
1548 trace_nfs_invalidate_mapping_enter(inode);
1549 ret = nfs_invalidate_mapping(inode, mapping);
1550 trace_nfs_invalidate_mapping_exit(inode, ret);
1551
1552 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1553 smp_mb__after_atomic();
1554 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1555 out:
1556 return ret;
1557 }
1558
nfs_mapping_need_revalidate_inode(struct inode * inode)1559 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1560 {
1561 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1562 NFS_STALE(inode);
1563 }
1564
nfs_revalidate_mapping_rcu(struct inode * inode)1565 int nfs_revalidate_mapping_rcu(struct inode *inode)
1566 {
1567 struct nfs_inode *nfsi = NFS_I(inode);
1568 unsigned long *bitlock = &nfsi->flags;
1569 int ret = 0;
1570
1571 if (IS_SWAPFILE(inode))
1572 goto out;
1573 if (nfs_mapping_need_revalidate_inode(inode)) {
1574 ret = -ECHILD;
1575 goto out;
1576 }
1577 spin_lock(&inode->i_lock);
1578 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1579 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1580 ret = -ECHILD;
1581 spin_unlock(&inode->i_lock);
1582 out:
1583 return ret;
1584 }
1585
1586 /**
1587 * nfs_revalidate_mapping - Revalidate the pagecache
1588 * @inode: pointer to host inode
1589 * @mapping: pointer to mapping
1590 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1591 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1592 {
1593 /* swapfiles are not supposed to be shared. */
1594 if (IS_SWAPFILE(inode))
1595 return 0;
1596
1597 if (nfs_mapping_need_revalidate_inode(inode)) {
1598 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1599 if (ret < 0)
1600 return ret;
1601 }
1602
1603 return nfs_clear_invalid_mapping(mapping);
1604 }
1605
nfs_file_has_writers(struct nfs_inode * nfsi)1606 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1607 {
1608 struct inode *inode = &nfsi->vfs_inode;
1609
1610 if (!S_ISREG(inode->i_mode))
1611 return false;
1612 if (list_empty(&nfsi->open_files))
1613 return false;
1614 return inode_is_open_for_write(inode);
1615 }
1616
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1617 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1618 {
1619 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1620 }
1621
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1622 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1623 {
1624 struct timespec64 ts;
1625
1626 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1627 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1628 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1629 inode_set_iversion_raw(inode, fattr->change_attr);
1630 if (S_ISDIR(inode->i_mode))
1631 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1632 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1633 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1634 }
1635 /* If we have atomic WCC data, we may update some attributes */
1636 ts = inode_get_ctime(inode);
1637 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1638 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1639 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1640 inode_set_ctime_to_ts(inode, fattr->ctime);
1641 }
1642
1643 ts = inode_get_mtime(inode);
1644 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1645 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1646 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1647 inode_set_mtime_to_ts(inode, fattr->mtime);
1648 }
1649 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1650 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1651 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1652 && !nfs_have_writebacks(inode)) {
1653 trace_nfs_size_wcc(inode, fattr->size);
1654 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1655 }
1656 }
1657
1658 /**
1659 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1660 * @inode: pointer to inode
1661 * @fattr: updated attributes
1662 *
1663 * Verifies the attribute cache. If we have just changed the attributes,
1664 * so that fattr carries weak cache consistency data, then it may
1665 * also update the ctime/mtime/change_attribute.
1666 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1667 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1668 {
1669 struct nfs_inode *nfsi = NFS_I(inode);
1670 loff_t cur_size, new_isize;
1671 unsigned long invalid = 0;
1672 struct timespec64 ts;
1673
1674 if (nfs_have_delegated_attributes(inode))
1675 return 0;
1676
1677 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1678 /* Only a mounted-on-fileid? Just exit */
1679 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1680 return 0;
1681 /* Has the inode gone and changed behind our back? */
1682 } else if (nfsi->fileid != fattr->fileid) {
1683 /* Is this perhaps the mounted-on fileid? */
1684 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1685 nfsi->fileid == fattr->mounted_on_fileid)
1686 return 0;
1687 return -ESTALE;
1688 }
1689 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1690 return -ESTALE;
1691
1692
1693 if (!nfs_file_has_buffered_writers(nfsi)) {
1694 /* Verify a few of the more important attributes */
1695 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1696 invalid |= NFS_INO_INVALID_CHANGE;
1697
1698 ts = inode_get_mtime(inode);
1699 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1700 invalid |= NFS_INO_INVALID_MTIME;
1701
1702 ts = inode_get_ctime(inode);
1703 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1704 invalid |= NFS_INO_INVALID_CTIME;
1705
1706 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1707 cur_size = i_size_read(inode);
1708 new_isize = nfs_size_to_loff_t(fattr->size);
1709 if (cur_size != new_isize)
1710 invalid |= NFS_INO_INVALID_SIZE;
1711 }
1712 }
1713
1714 /* Have any file permissions changed? */
1715 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1716 invalid |= NFS_INO_INVALID_MODE;
1717 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1718 invalid |= NFS_INO_INVALID_OTHER;
1719 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1720 invalid |= NFS_INO_INVALID_OTHER;
1721
1722 /* Has the link count changed? */
1723 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1724 invalid |= NFS_INO_INVALID_NLINK;
1725
1726 ts = inode_get_atime(inode);
1727 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1728 invalid |= NFS_INO_INVALID_ATIME;
1729
1730 if (invalid != 0)
1731 nfs_set_cache_invalid(inode, invalid);
1732
1733 nfsi->read_cache_jiffies = fattr->time_start;
1734 return 0;
1735 }
1736
1737 static atomic_long_t nfs_attr_generation_counter;
1738
nfs_read_attr_generation_counter(void)1739 static unsigned long nfs_read_attr_generation_counter(void)
1740 {
1741 return atomic_long_read(&nfs_attr_generation_counter);
1742 }
1743
nfs_inc_attr_generation_counter(void)1744 unsigned long nfs_inc_attr_generation_counter(void)
1745 {
1746 return atomic_long_inc_return(&nfs_attr_generation_counter);
1747 }
1748 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1749
nfs_fattr_init(struct nfs_fattr * fattr)1750 void nfs_fattr_init(struct nfs_fattr *fattr)
1751 {
1752 fattr->valid = 0;
1753 fattr->time_start = jiffies;
1754 fattr->gencount = nfs_inc_attr_generation_counter();
1755 fattr->owner_name = NULL;
1756 fattr->group_name = NULL;
1757 fattr->mdsthreshold = NULL;
1758 }
1759 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1760
1761 /**
1762 * nfs_fattr_set_barrier
1763 * @fattr: attributes
1764 *
1765 * Used to set a barrier after an attribute was updated. This
1766 * barrier ensures that older attributes from RPC calls that may
1767 * have raced with our update cannot clobber these new values.
1768 * Note that you are still responsible for ensuring that other
1769 * operations which change the attribute on the server do not
1770 * collide.
1771 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1772 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1773 {
1774 fattr->gencount = nfs_inc_attr_generation_counter();
1775 }
1776
nfs_alloc_fattr(void)1777 struct nfs_fattr *nfs_alloc_fattr(void)
1778 {
1779 struct nfs_fattr *fattr;
1780
1781 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1782 if (fattr != NULL) {
1783 nfs_fattr_init(fattr);
1784 fattr->label = NULL;
1785 }
1786 return fattr;
1787 }
1788 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1789
nfs_alloc_fattr_with_label(struct nfs_server * server)1790 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1791 {
1792 struct nfs_fattr *fattr = nfs_alloc_fattr();
1793
1794 if (!fattr)
1795 return NULL;
1796
1797 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1798 if (IS_ERR(fattr->label)) {
1799 kfree(fattr);
1800 return NULL;
1801 }
1802
1803 return fattr;
1804 }
1805 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1806
nfs_alloc_fhandle(void)1807 struct nfs_fh *nfs_alloc_fhandle(void)
1808 {
1809 struct nfs_fh *fh;
1810
1811 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1812 if (fh != NULL)
1813 fh->size = 0;
1814 return fh;
1815 }
1816 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1817
1818 #ifdef NFS_DEBUG
1819 /*
1820 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1821 * in the same way that wireshark does
1822 *
1823 * @fh: file handle
1824 *
1825 * For debugging only.
1826 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1827 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1828 {
1829 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1830 * not on the result */
1831 return nfs_fhandle_hash(fh);
1832 }
1833 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1834
1835 /*
1836 * _nfs_display_fhandle - display an NFS file handle on the console
1837 *
1838 * @fh: file handle to display
1839 * @caption: display caption
1840 *
1841 * For debugging only.
1842 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1843 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1844 {
1845 unsigned short i;
1846
1847 if (fh == NULL || fh->size == 0) {
1848 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1849 return;
1850 }
1851
1852 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1853 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1854 for (i = 0; i < fh->size; i += 16) {
1855 __be32 *pos = (__be32 *)&fh->data[i];
1856
1857 switch ((fh->size - i - 1) >> 2) {
1858 case 0:
1859 printk(KERN_DEFAULT " %08x\n",
1860 be32_to_cpup(pos));
1861 break;
1862 case 1:
1863 printk(KERN_DEFAULT " %08x %08x\n",
1864 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1865 break;
1866 case 2:
1867 printk(KERN_DEFAULT " %08x %08x %08x\n",
1868 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1869 be32_to_cpup(pos + 2));
1870 break;
1871 default:
1872 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1873 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1874 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1875 }
1876 }
1877 }
1878 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1879 #endif
1880
1881 /**
1882 * nfs_inode_attrs_cmp_generic - compare attributes
1883 * @fattr: attributes
1884 * @inode: pointer to inode
1885 *
1886 * Attempt to divine whether or not an RPC call reply carrying stale
1887 * attributes got scheduled after another call carrying updated ones.
1888 * Note also the check for wraparound of 'attr_gencount'
1889 *
1890 * The function returns '1' if it thinks the attributes in @fattr are
1891 * more recent than the ones cached in @inode. Otherwise it returns
1892 * the value '0'.
1893 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1894 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1895 const struct inode *inode)
1896 {
1897 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1898
1899 return (long)(fattr->gencount - attr_gencount) > 0 ||
1900 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1901 }
1902
1903 /**
1904 * nfs_inode_attrs_cmp_monotonic - compare attributes
1905 * @fattr: attributes
1906 * @inode: pointer to inode
1907 *
1908 * Attempt to divine whether or not an RPC call reply carrying stale
1909 * attributes got scheduled after another call carrying updated ones.
1910 *
1911 * We assume that the server observes monotonic semantics for
1912 * the change attribute, so a larger value means that the attributes in
1913 * @fattr are more recent, in which case the function returns the
1914 * value '1'.
1915 * A return value of '0' indicates no measurable change
1916 * A return value of '-1' means that the attributes in @inode are
1917 * more recent.
1918 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1919 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1920 const struct inode *inode)
1921 {
1922 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1923 if (diff > 0)
1924 return 1;
1925 return diff == 0 ? 0 : -1;
1926 }
1927
1928 /**
1929 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1930 * @fattr: attributes
1931 * @inode: pointer to inode
1932 *
1933 * Attempt to divine whether or not an RPC call reply carrying stale
1934 * attributes got scheduled after another call carrying updated ones.
1935 *
1936 * We assume that the server observes strictly monotonic semantics for
1937 * the change attribute, so a larger value means that the attributes in
1938 * @fattr are more recent, in which case the function returns the
1939 * value '1'.
1940 * A return value of '-1' means that the attributes in @inode are
1941 * more recent or unchanged.
1942 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1943 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1944 const struct inode *inode)
1945 {
1946 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1947 }
1948
1949 /**
1950 * nfs_inode_attrs_cmp - compare attributes
1951 * @fattr: attributes
1952 * @inode: pointer to inode
1953 *
1954 * This function returns '1' if it thinks the attributes in @fattr are
1955 * more recent than the ones cached in @inode. It returns '-1' if
1956 * the attributes in @inode are more recent than the ones in @fattr,
1957 * and it returns 0 if not sure.
1958 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1959 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1960 const struct inode *inode)
1961 {
1962 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1963 return 1;
1964 switch (NFS_SERVER(inode)->change_attr_type) {
1965 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1966 break;
1967 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1968 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1969 break;
1970 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1971 default:
1972 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1973 break;
1974 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1975 }
1976 return 0;
1977 }
1978
1979 /**
1980 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1981 * @fattr: attributes
1982 * @inode: pointer to inode
1983 *
1984 * Returns '1' if the last attribute update left the inode cached
1985 * attributes in a partially unrevalidated state, and @fattr
1986 * matches the change attribute of that partial update.
1987 * Otherwise returns '0'.
1988 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1989 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1990 const struct inode *inode)
1991 {
1992 const unsigned long check_valid =
1993 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1994 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1995 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1996 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME;
1997 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1998 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1999
2000 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
2001 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
2002 (cache_validity & check_valid) != 0 &&
2003 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2004 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
2005 return 1;
2006 return 0;
2007 }
2008
nfs_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)2009 static void nfs_ooo_merge(struct nfs_inode *nfsi,
2010 u64 start, u64 end)
2011 {
2012 int i, cnt;
2013
2014 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
2015 /* No point merging anything */
2016 return;
2017
2018 if (!nfsi->ooo) {
2019 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
2020 if (!nfsi->ooo) {
2021 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2022 return;
2023 }
2024 nfsi->ooo->cnt = 0;
2025 }
2026
2027 /* add this range, merging if possible */
2028 cnt = nfsi->ooo->cnt;
2029 for (i = 0; i < cnt; i++) {
2030 if (end == nfsi->ooo->gap[i].start)
2031 end = nfsi->ooo->gap[i].end;
2032 else if (start == nfsi->ooo->gap[i].end)
2033 start = nfsi->ooo->gap[i].start;
2034 else
2035 continue;
2036 /* Remove 'i' from table and loop to insert the new range */
2037 cnt -= 1;
2038 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
2039 i = -1;
2040 }
2041 if (start != end) {
2042 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
2043 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2044 kfree(nfsi->ooo);
2045 nfsi->ooo = NULL;
2046 return;
2047 }
2048 nfsi->ooo->gap[cnt].start = start;
2049 nfsi->ooo->gap[cnt].end = end;
2050 cnt += 1;
2051 }
2052 nfsi->ooo->cnt = cnt;
2053 }
2054
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)2055 static void nfs_ooo_record(struct nfs_inode *nfsi,
2056 struct nfs_fattr *fattr)
2057 {
2058 /* This reply was out-of-order, so record in the
2059 * pre/post change id, possibly cancelling
2060 * gaps created when iversion was jumpped forward.
2061 */
2062 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
2063 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
2064 nfs_ooo_merge(nfsi,
2065 fattr->change_attr,
2066 fattr->pre_change_attr);
2067 }
2068
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)2069 static int nfs_refresh_inode_locked(struct inode *inode,
2070 struct nfs_fattr *fattr)
2071 {
2072 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2073 int ret = 0;
2074
2075 trace_nfs_refresh_inode_enter(inode);
2076
2077 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
2078 ret = nfs_update_inode(inode, fattr);
2079 else {
2080 nfs_ooo_record(NFS_I(inode), fattr);
2081
2082 if (attr_cmp == 0)
2083 ret = nfs_check_inode_attributes(inode, fattr);
2084 }
2085
2086 trace_nfs_refresh_inode_exit(inode, ret);
2087 return ret;
2088 }
2089
2090 /**
2091 * nfs_refresh_inode - try to update the inode attribute cache
2092 * @inode: pointer to inode
2093 * @fattr: updated attributes
2094 *
2095 * Check that an RPC call that returned attributes has not overlapped with
2096 * other recent updates of the inode metadata, then decide whether it is
2097 * safe to do a full update of the inode attributes, or whether just to
2098 * call nfs_check_inode_attributes.
2099 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)2100 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
2101 {
2102 int status;
2103
2104 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2105 return 0;
2106 spin_lock(&inode->i_lock);
2107 status = nfs_refresh_inode_locked(inode, fattr);
2108 spin_unlock(&inode->i_lock);
2109
2110 return status;
2111 }
2112 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
2113
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)2114 static int nfs_post_op_update_inode_locked(struct inode *inode,
2115 struct nfs_fattr *fattr, unsigned int invalid)
2116 {
2117 if (S_ISDIR(inode->i_mode))
2118 invalid |= NFS_INO_INVALID_DATA;
2119 nfs_set_cache_invalid(inode, invalid);
2120 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2121 return 0;
2122 return nfs_refresh_inode_locked(inode, fattr);
2123 }
2124
2125 /**
2126 * nfs_post_op_update_inode - try to update the inode attribute cache
2127 * @inode: pointer to inode
2128 * @fattr: updated attributes
2129 *
2130 * After an operation that has changed the inode metadata, mark the
2131 * attribute cache as being invalid, then try to update it.
2132 *
2133 * NB: if the server didn't return any post op attributes, this
2134 * function will force the retrieval of attributes before the next
2135 * NFS request. Thus it should be used only for operations that
2136 * are expected to change one or more attributes, to avoid
2137 * unnecessary NFS requests and trips through nfs_update_inode().
2138 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)2139 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2140 {
2141 int status;
2142
2143 spin_lock(&inode->i_lock);
2144 nfs_fattr_set_barrier(fattr);
2145 status = nfs_post_op_update_inode_locked(inode, fattr,
2146 NFS_INO_INVALID_CHANGE
2147 | NFS_INO_INVALID_CTIME
2148 | NFS_INO_REVAL_FORCED);
2149 spin_unlock(&inode->i_lock);
2150
2151 return status;
2152 }
2153 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
2154
2155 /**
2156 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
2157 * @inode: pointer to inode
2158 * @fattr: updated attributes
2159 *
2160 * After an operation that has changed the inode metadata, mark the
2161 * attribute cache as being invalid, then try to update it. Fake up
2162 * weak cache consistency data, if none exist.
2163 *
2164 * This function is mainly designed to be used by the ->write_done() functions.
2165 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)2166 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
2167 {
2168 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2169 int status;
2170
2171 /* Don't do a WCC update if these attributes are already stale */
2172 if (attr_cmp < 0)
2173 return 0;
2174 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
2175 /* Record the pre/post change info before clearing PRECHANGE */
2176 nfs_ooo_record(NFS_I(inode), fattr);
2177 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
2178 | NFS_ATTR_FATTR_PRESIZE
2179 | NFS_ATTR_FATTR_PREMTIME
2180 | NFS_ATTR_FATTR_PRECTIME);
2181 goto out_noforce;
2182 }
2183 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2184 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
2185 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
2186 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
2187 }
2188 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
2189 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2190 fattr->pre_ctime = inode_get_ctime(inode);
2191 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2192 }
2193 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2194 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2195 fattr->pre_mtime = inode_get_mtime(inode);
2196 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2197 }
2198 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2199 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2200 fattr->pre_size = i_size_read(inode);
2201 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2202 }
2203 out_noforce:
2204 status = nfs_post_op_update_inode_locked(inode, fattr,
2205 NFS_INO_INVALID_CHANGE
2206 | NFS_INO_INVALID_CTIME
2207 | NFS_INO_INVALID_MTIME
2208 | NFS_INO_INVALID_BLOCKS);
2209 return status;
2210 }
2211
2212 /**
2213 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2214 * @inode: pointer to inode
2215 * @fattr: updated attributes
2216 *
2217 * After an operation that has changed the inode metadata, mark the
2218 * attribute cache as being invalid, then try to update it. Fake up
2219 * weak cache consistency data, if none exist.
2220 *
2221 * This function is mainly designed to be used by the ->write_done() functions.
2222 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2223 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2224 {
2225 int status;
2226
2227 spin_lock(&inode->i_lock);
2228 nfs_fattr_set_barrier(fattr);
2229 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2230 spin_unlock(&inode->i_lock);
2231 return status;
2232 }
2233 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2234
2235
2236 /*
2237 * Many nfs protocol calls return the new file attributes after
2238 * an operation. Here we update the inode to reflect the state
2239 * of the server's inode.
2240 *
2241 * This is a bit tricky because we have to make sure all dirty pages
2242 * have been sent off to the server before calling invalidate_inode_pages.
2243 * To make sure no other process adds more write requests while we try
2244 * our best to flush them, we make them sleep during the attribute refresh.
2245 *
2246 * A very similar scenario holds for the dir cache.
2247 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2248 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2249 {
2250 struct nfs_server *server = NFS_SERVER(inode);
2251 struct nfs_inode *nfsi = NFS_I(inode);
2252 loff_t cur_isize, new_isize;
2253 u64 fattr_supported = server->fattr_valid;
2254 unsigned long invalid = 0;
2255 unsigned long now = jiffies;
2256 unsigned long save_cache_validity;
2257 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2258 bool cache_revalidated = true;
2259 bool attr_changed = false;
2260 bool have_delegation;
2261
2262 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%llx)\n",
2263 __func__, inode->i_sb->s_id, inode->i_ino,
2264 nfs_display_fhandle_hash(NFS_FH(inode)),
2265 icount_read(inode), fattr->valid);
2266
2267 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2268 /* Only a mounted-on-fileid? Just exit */
2269 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2270 return 0;
2271 /* Has the inode gone and changed behind our back? */
2272 } else if (nfsi->fileid != fattr->fileid) {
2273 /* Is this perhaps the mounted-on fileid? */
2274 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2275 nfsi->fileid == fattr->mounted_on_fileid)
2276 return 0;
2277 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2278 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2279 NFS_SERVER(inode)->nfs_client->cl_hostname,
2280 inode->i_sb->s_id, (long long)nfsi->fileid,
2281 (long long)fattr->fileid);
2282 goto out_err;
2283 }
2284
2285 /*
2286 * Make sure the inode's type hasn't changed.
2287 */
2288 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2289 /*
2290 * Big trouble! The inode has become a different object.
2291 */
2292 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2293 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2294 goto out_err;
2295 }
2296
2297 /* Update the fsid? */
2298 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2299 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2300 !IS_AUTOMOUNT(inode))
2301 server->fsid = fattr->fsid;
2302
2303 /* Save the delegation state before clearing cache_validity */
2304 have_delegation = nfs_have_delegated_attributes(inode);
2305
2306 /*
2307 * Update the read time so we don't revalidate too often.
2308 */
2309 nfsi->read_cache_jiffies = fattr->time_start;
2310
2311 /* Fix up any delegated attributes in the struct nfs_fattr */
2312 nfs_fattr_fixup_delegated(inode, fattr);
2313
2314 save_cache_validity = nfsi->cache_validity;
2315 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2316 | NFS_INO_INVALID_ATIME
2317 | NFS_INO_REVAL_FORCED
2318 | NFS_INO_INVALID_BLOCKS);
2319
2320 /* Do atomic weak cache consistency updates */
2321 nfs_wcc_update_inode(inode, fattr);
2322
2323 if (pnfs_layoutcommit_outstanding(inode)) {
2324 nfsi->cache_validity |=
2325 save_cache_validity &
2326 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2327 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2328 NFS_INO_INVALID_BLOCKS);
2329 cache_revalidated = false;
2330 }
2331
2332 /* More cache consistency checks */
2333 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2334 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2335 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2336 /* There is one remaining gap that hasn't been
2337 * merged into iversion - do that now.
2338 */
2339 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2340 kfree(nfsi->ooo);
2341 nfsi->ooo = NULL;
2342 }
2343 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2344 /* Could it be a race with writeback? */
2345 if (!(have_writers || have_delegation)) {
2346 invalid |= NFS_INO_INVALID_DATA
2347 | NFS_INO_INVALID_ACCESS
2348 | NFS_INO_INVALID_ACL
2349 | NFS_INO_INVALID_XATTR;
2350 /* Force revalidate of all attributes */
2351 save_cache_validity |= NFS_INO_INVALID_CTIME
2352 | NFS_INO_INVALID_MTIME
2353 | NFS_INO_INVALID_SIZE
2354 | NFS_INO_INVALID_BLOCKS
2355 | NFS_INO_INVALID_NLINK
2356 | NFS_INO_INVALID_MODE
2357 | NFS_INO_INVALID_OTHER
2358 | NFS_INO_INVALID_BTIME;
2359 if (S_ISDIR(inode->i_mode))
2360 nfs_force_lookup_revalidate(inode);
2361 attr_changed = true;
2362 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2363 inode->i_sb->s_id,
2364 inode->i_ino);
2365 } else if (!have_delegation) {
2366 nfs_ooo_record(nfsi, fattr);
2367 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2368 fattr->change_attr);
2369 }
2370 inode_set_iversion_raw(inode, fattr->change_attr);
2371 }
2372 } else {
2373 nfsi->cache_validity |=
2374 save_cache_validity & NFS_INO_INVALID_CHANGE;
2375 if (!have_delegation ||
2376 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2377 cache_revalidated = false;
2378 }
2379
2380 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2381 inode_set_mtime_to_ts(inode, fattr->mtime);
2382 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2383 nfsi->cache_validity |=
2384 save_cache_validity & NFS_INO_INVALID_MTIME;
2385
2386 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2387 inode_set_ctime_to_ts(inode, fattr->ctime);
2388 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2389 nfsi->cache_validity |=
2390 save_cache_validity & NFS_INO_INVALID_CTIME;
2391
2392 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
2393 nfsi->btime = fattr->btime;
2394 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
2395 nfsi->cache_validity |=
2396 save_cache_validity & NFS_INO_INVALID_BTIME;
2397
2398 /* Check if our cached file size is stale */
2399 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2400 new_isize = nfs_size_to_loff_t(fattr->size);
2401 cur_isize = i_size_read(inode);
2402 if (new_isize != cur_isize && !have_delegation) {
2403 /* Do we perhaps have any outstanding writes, or has
2404 * the file grown beyond our last write? */
2405 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2406 trace_nfs_size_update(inode, new_isize);
2407 i_size_write(inode, new_isize);
2408 if (!have_writers)
2409 invalid |= NFS_INO_INVALID_DATA;
2410 }
2411 }
2412 if (new_isize == 0 &&
2413 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2414 NFS_ATTR_FATTR_BLOCKS_USED))) {
2415 fattr->du.nfs3.used = 0;
2416 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2417 }
2418 } else
2419 nfsi->cache_validity |=
2420 save_cache_validity & NFS_INO_INVALID_SIZE;
2421
2422 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2423 inode_set_atime_to_ts(inode, fattr->atime);
2424 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2425 nfsi->cache_validity |=
2426 save_cache_validity & NFS_INO_INVALID_ATIME;
2427
2428 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2429 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2430 umode_t newmode = inode->i_mode & S_IFMT;
2431 newmode |= fattr->mode & S_IALLUGO;
2432 inode->i_mode = newmode;
2433 invalid |= NFS_INO_INVALID_ACCESS
2434 | NFS_INO_INVALID_ACL;
2435 }
2436 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2437 nfsi->cache_validity |=
2438 save_cache_validity & NFS_INO_INVALID_MODE;
2439
2440 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2441 if (!uid_eq(inode->i_uid, fattr->uid)) {
2442 invalid |= NFS_INO_INVALID_ACCESS
2443 | NFS_INO_INVALID_ACL;
2444 inode->i_uid = fattr->uid;
2445 }
2446 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2447 nfsi->cache_validity |=
2448 save_cache_validity & NFS_INO_INVALID_OTHER;
2449
2450 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2451 if (!gid_eq(inode->i_gid, fattr->gid)) {
2452 invalid |= NFS_INO_INVALID_ACCESS
2453 | NFS_INO_INVALID_ACL;
2454 inode->i_gid = fattr->gid;
2455 }
2456 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2457 nfsi->cache_validity |=
2458 save_cache_validity & NFS_INO_INVALID_OTHER;
2459
2460 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2461 if (inode->i_nlink != fattr->nlink)
2462 set_nlink(inode, fattr->nlink);
2463 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2464 nfsi->cache_validity |=
2465 save_cache_validity & NFS_INO_INVALID_NLINK;
2466
2467 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2468 /*
2469 * report the blocks in 512byte units
2470 */
2471 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2472 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2473 nfsi->cache_validity |=
2474 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2475
2476 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2477 inode->i_blocks = fattr->du.nfs2.blocks;
2478 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2479 nfsi->cache_validity |=
2480 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2481
2482 /* Update attrtimeo value if we're out of the unstable period */
2483 if (attr_changed) {
2484 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2485 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2486 nfsi->attrtimeo_timestamp = now;
2487 /* Set barrier to be more recent than all outstanding updates */
2488 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2489 } else {
2490 if (cache_revalidated) {
2491 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2492 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2493 nfsi->attrtimeo <<= 1;
2494 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2495 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2496 }
2497 nfsi->attrtimeo_timestamp = now;
2498 }
2499 /* Set the barrier to be more recent than this fattr */
2500 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2501 nfsi->attr_gencount = fattr->gencount;
2502 }
2503
2504 /* Don't invalidate the data if we were to blame */
2505 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2506 || S_ISLNK(inode->i_mode)))
2507 invalid &= ~NFS_INO_INVALID_DATA;
2508 nfs_set_cache_invalid(inode, invalid);
2509
2510 return 0;
2511 out_err:
2512 /*
2513 * No need to worry about unhashing the dentry, as the
2514 * lookup validation will know that the inode is bad.
2515 * (But we fall through to invalidate the caches.)
2516 */
2517 nfs_set_inode_stale_locked(inode);
2518 return -ESTALE;
2519 }
2520
nfs_alloc_inode(struct super_block * sb)2521 struct inode *nfs_alloc_inode(struct super_block *sb)
2522 {
2523 struct nfs_inode *nfsi;
2524 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2525 if (!nfsi)
2526 return NULL;
2527 nfsi->flags = 0UL;
2528 nfsi->cache_validity = 0UL;
2529 nfsi->ooo = NULL;
2530 #if IS_ENABLED(CONFIG_NFS_V4)
2531 nfsi->nfs4_acl = NULL;
2532 #endif /* CONFIG_NFS_V4 */
2533 #ifdef CONFIG_NFS_V4_2
2534 nfsi->xattr_cache = NULL;
2535 #endif
2536 nfs_netfs_inode_init(nfsi);
2537
2538 return &nfsi->vfs_inode;
2539 }
2540 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2541
nfs_free_inode(struct inode * inode)2542 void nfs_free_inode(struct inode *inode)
2543 {
2544 kfree(NFS_I(inode)->ooo);
2545 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2546 }
2547 EXPORT_SYMBOL_GPL(nfs_free_inode);
2548
nfs4_init_once(struct nfs_inode * nfsi)2549 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2550 {
2551 #if IS_ENABLED(CONFIG_NFS_V4)
2552 INIT_LIST_HEAD(&nfsi->open_states);
2553 nfsi->delegation = NULL;
2554 init_rwsem(&nfsi->rwsem);
2555 nfsi->layout = NULL;
2556 #endif
2557 }
2558
init_once(void * foo)2559 static void init_once(void *foo)
2560 {
2561 struct nfs_inode *nfsi = foo;
2562
2563 inode_init_once(&nfsi->vfs_inode);
2564 INIT_LIST_HEAD(&nfsi->open_files);
2565 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2566 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2567 nfs4_init_once(nfsi);
2568 }
2569
nfs_init_inodecache(void)2570 static int __init nfs_init_inodecache(void)
2571 {
2572 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2573 sizeof(struct nfs_inode),
2574 0, (SLAB_RECLAIM_ACCOUNT|
2575 SLAB_ACCOUNT),
2576 init_once);
2577 if (nfs_inode_cachep == NULL)
2578 return -ENOMEM;
2579
2580 return 0;
2581 }
2582
nfs_destroy_inodecache(void)2583 static void nfs_destroy_inodecache(void)
2584 {
2585 /*
2586 * Make sure all delayed rcu free inodes are flushed before we
2587 * destroy cache.
2588 */
2589 rcu_barrier();
2590 kmem_cache_destroy(nfs_inode_cachep);
2591 }
2592
2593 struct workqueue_struct *nfslocaliod_workqueue;
2594 struct workqueue_struct *nfsiod_workqueue;
2595 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2596
2597 /*
2598 * Destroy the nfsiod workqueues
2599 */
nfsiod_stop(void)2600 static void nfsiod_stop(void)
2601 {
2602 struct workqueue_struct *wq;
2603
2604 wq = nfsiod_workqueue;
2605 if (wq != NULL) {
2606 nfsiod_workqueue = NULL;
2607 destroy_workqueue(wq);
2608 }
2609 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2610 wq = nfslocaliod_workqueue;
2611 if (wq != NULL) {
2612 nfslocaliod_workqueue = NULL;
2613 destroy_workqueue(wq);
2614 }
2615 #endif /* CONFIG_NFS_LOCALIO */
2616 }
2617
2618 /*
2619 * Start the nfsiod workqueues
2620 */
nfsiod_start(void)2621 static int nfsiod_start(void)
2622 {
2623 dprintk("RPC: creating workqueue nfsiod\n");
2624 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2625 if (nfsiod_workqueue == NULL)
2626 return -ENOMEM;
2627 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2628 /*
2629 * localio writes need to use a normal (non-memreclaim) workqueue.
2630 * When we start getting low on space, XFS goes and calls flush_work() on
2631 * a non-memreclaim work queue, which causes a priority inversion problem.
2632 */
2633 dprintk("RPC: creating workqueue nfslocaliod\n");
2634 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0);
2635 if (unlikely(nfslocaliod_workqueue == NULL)) {
2636 nfsiod_stop();
2637 return -ENOMEM;
2638 }
2639 #endif /* CONFIG_NFS_LOCALIO */
2640 return 0;
2641 }
2642
2643 unsigned int nfs_net_id;
2644 EXPORT_SYMBOL_GPL(nfs_net_id);
2645
nfs_net_init(struct net * net)2646 static int nfs_net_init(struct net *net)
2647 {
2648 struct nfs_net *nn = net_generic(net, nfs_net_id);
2649 int err;
2650
2651 nfs_clients_init(net);
2652
2653 if (!rpc_proc_register(net, &nn->rpcstats)) {
2654 err = -ENOMEM;
2655 goto err_proc_rpc;
2656 }
2657
2658 err = nfs_fs_proc_net_init(net);
2659 if (err)
2660 goto err_proc_nfs;
2661
2662 return 0;
2663
2664 err_proc_nfs:
2665 rpc_proc_unregister(net, "nfs");
2666 err_proc_rpc:
2667 nfs_clients_exit(net);
2668 return err;
2669 }
2670
nfs_net_exit(struct net * net)2671 static void nfs_net_exit(struct net *net)
2672 {
2673 rpc_proc_unregister(net, "nfs");
2674 nfs_fs_proc_net_exit(net);
2675 nfs_clients_exit(net);
2676 }
2677
2678 static struct pernet_operations nfs_net_ops = {
2679 .init = nfs_net_init,
2680 .exit = nfs_net_exit,
2681 .id = &nfs_net_id,
2682 .size = sizeof(struct nfs_net),
2683 };
2684
2685 #ifdef CONFIG_KEYS
2686 static struct key *nfs_keyring;
2687
nfs_init_keyring(void)2688 static int __init nfs_init_keyring(void)
2689 {
2690 nfs_keyring = keyring_alloc(".nfs",
2691 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
2692 current_cred(),
2693 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
2694 (KEY_USR_ALL & ~KEY_USR_SETATTR),
2695 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
2696 return PTR_ERR_OR_ZERO(nfs_keyring);
2697 }
2698
nfs_exit_keyring(void)2699 static void nfs_exit_keyring(void)
2700 {
2701 key_put(nfs_keyring);
2702 }
2703 #else
nfs_init_keyring(void)2704 static inline int nfs_init_keyring(void)
2705 {
2706 return 0;
2707 }
2708
nfs_exit_keyring(void)2709 static inline void nfs_exit_keyring(void)
2710 {
2711 }
2712 #endif /* CONFIG_KEYS */
2713
2714 /*
2715 * Initialize NFS
2716 */
init_nfs_fs(void)2717 static int __init init_nfs_fs(void)
2718 {
2719 int err;
2720
2721 err = nfs_init_keyring();
2722 if (err)
2723 return err;
2724
2725 err = nfs_sysfs_init();
2726 if (err < 0)
2727 goto out10;
2728
2729 err = register_pernet_subsys(&nfs_net_ops);
2730 if (err < 0)
2731 goto out9;
2732
2733 err = nfsiod_start();
2734 if (err)
2735 goto out7;
2736
2737 err = nfs_fs_proc_init();
2738 if (err)
2739 goto out6;
2740
2741 err = nfs_init_nfspagecache();
2742 if (err)
2743 goto out5;
2744
2745 err = nfs_init_inodecache();
2746 if (err)
2747 goto out4;
2748
2749 err = nfs_init_readpagecache();
2750 if (err)
2751 goto out3;
2752
2753 err = nfs_init_writepagecache();
2754 if (err)
2755 goto out2;
2756
2757 err = nfs_init_directcache();
2758 if (err)
2759 goto out1;
2760
2761 err = register_nfs_fs();
2762 if (err)
2763 goto out0;
2764
2765 return 0;
2766 out0:
2767 nfs_destroy_directcache();
2768 out1:
2769 nfs_destroy_writepagecache();
2770 out2:
2771 nfs_destroy_readpagecache();
2772 out3:
2773 nfs_destroy_inodecache();
2774 out4:
2775 nfs_destroy_nfspagecache();
2776 out5:
2777 nfs_fs_proc_exit();
2778 out6:
2779 nfsiod_stop();
2780 out7:
2781 unregister_pernet_subsys(&nfs_net_ops);
2782 out9:
2783 nfs_sysfs_exit();
2784 out10:
2785 nfs_exit_keyring();
2786 return err;
2787 }
2788
exit_nfs_fs(void)2789 static void __exit exit_nfs_fs(void)
2790 {
2791 nfs_destroy_directcache();
2792 nfs_destroy_writepagecache();
2793 nfs_destroy_readpagecache();
2794 nfs_destroy_inodecache();
2795 nfs_destroy_nfspagecache();
2796 unregister_pernet_subsys(&nfs_net_ops);
2797 unregister_nfs_fs();
2798 nfs_fs_proc_exit();
2799 nfsiod_stop();
2800 nfs_sysfs_exit();
2801 nfs_exit_keyring();
2802 }
2803
2804 /* Not quite true; I just maintain it */
2805 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2806 MODULE_DESCRIPTION("NFS client support");
2807 MODULE_LICENSE("GPL");
2808 module_param(enable_ino64, bool, 0644);
2809
2810 module_init(init_nfs_fs)
2811 module_exit(exit_nfs_fs)
2812