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_obj(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 bool updated = false;
653
654 now = inode_set_ctime_current(inode);
655 if (!timespec64_equal(&now, &ctime))
656 updated = true;
657
658 inode_set_mtime_to_ts(inode, attr->ia_mtime);
659 if (!timespec64_equal(&now, &mtime))
660 updated = true;
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_atime(struct inode * inode)672 static void nfs_update_atime(struct inode *inode)
673 {
674 inode_update_time(inode, FS_UPD_ATIME, 0);
675 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ATIME;
676 }
677
nfs_update_mtime(struct inode * inode)678 static void nfs_update_mtime(struct inode *inode)
679 {
680 inode_update_time(inode, FS_UPD_CMTIME, 0);
681 NFS_I(inode)->cache_validity &=
682 ~(NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME);
683 }
684
nfs_update_delegated_atime(struct inode * inode)685 void nfs_update_delegated_atime(struct inode *inode)
686 {
687 spin_lock(&inode->i_lock);
688 if (nfs_have_delegated_atime(inode))
689 nfs_update_atime(inode);
690 spin_unlock(&inode->i_lock);
691 }
692
nfs_update_delegated_mtime_locked(struct inode * inode)693 void nfs_update_delegated_mtime_locked(struct inode *inode)
694 {
695 if (nfs_have_delegated_mtime(inode))
696 nfs_update_mtime(inode);
697 }
698
nfs_update_delegated_mtime(struct inode * inode)699 void nfs_update_delegated_mtime(struct inode *inode)
700 {
701 spin_lock(&inode->i_lock);
702 nfs_update_delegated_mtime_locked(inode);
703 spin_unlock(&inode->i_lock);
704 }
705 EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime);
706
707 #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)
708
709 int
nfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)710 nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
711 struct iattr *attr)
712 {
713 struct inode *inode = d_inode(dentry);
714 struct nfs_fattr *fattr;
715 loff_t oldsize;
716 int error = 0;
717 kuid_t task_uid = current_fsuid();
718 kuid_t owner_uid = inode->i_uid;
719
720 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
721
722 /* skip mode change if it's just for clearing setuid/setgid */
723 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
724 attr->ia_valid &= ~ATTR_MODE;
725
726 if (S_ISREG(inode->i_mode))
727 nfs_file_block_o_direct(NFS_I(inode));
728
729 oldsize = i_size_read(inode);
730 if (attr->ia_valid & ATTR_SIZE) {
731 BUG_ON(!S_ISREG(inode->i_mode));
732
733 error = inode_newsize_ok(inode, attr->ia_size);
734 if (error)
735 return error;
736
737 if (attr->ia_size == oldsize)
738 attr->ia_valid &= ~ATTR_SIZE;
739 }
740
741 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
742 spin_lock(&inode->i_lock);
743 if (attr->ia_valid & ATTR_MTIME_SET) {
744 if (uid_eq(task_uid, owner_uid)) {
745 nfs_set_timestamps_to_ts(inode, attr);
746 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET|
747 ATTR_ATIME|ATTR_ATIME_SET);
748 }
749 } else {
750 if (attr->ia_valid & ATTR_MTIME)
751 nfs_update_mtime(inode);
752 if (attr->ia_valid & ATTR_ATIME)
753 nfs_update_atime(inode);
754 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME);
755 }
756 spin_unlock(&inode->i_lock);
757 } else if (nfs_have_delegated_atime(inode) &&
758 attr->ia_valid & ATTR_ATIME &&
759 !(attr->ia_valid & ATTR_MTIME)) {
760 if (attr->ia_valid & ATTR_ATIME_SET) {
761 if (uid_eq(task_uid, owner_uid)) {
762 spin_lock(&inode->i_lock);
763 nfs_set_timestamps_to_ts(inode, attr);
764 spin_unlock(&inode->i_lock);
765 attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
766 }
767 } else {
768 nfs_update_delegated_atime(inode);
769 attr->ia_valid &= ~ATTR_ATIME;
770 }
771 }
772
773 /* Optimization: if the end result is no change, don't RPC */
774 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
775 return 0;
776
777 trace_nfs_setattr_enter(inode);
778
779 /* Write all dirty data */
780 if (S_ISREG(inode->i_mode))
781 nfs_sync_inode(inode);
782
783 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
784 if (fattr == NULL) {
785 error = -ENOMEM;
786 goto out;
787 }
788
789 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
790 if (error == 0) {
791 if (attr->ia_valid & ATTR_SIZE)
792 nfs_truncate_last_folio(inode->i_mapping, oldsize,
793 attr->ia_size);
794 error = nfs_refresh_inode(inode, fattr);
795 }
796 nfs_free_fattr(fattr);
797 out:
798 trace_nfs_setattr_exit(inode, error);
799 return error;
800 }
801 EXPORT_SYMBOL_GPL(nfs_setattr);
802
803 /**
804 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
805 * @inode: inode of the file used
806 * @offset: file offset to start truncating
807 *
808 * This is a copy of the common vmtruncate, but with the locking
809 * corrected to take into account the fact that NFS requires
810 * inode->i_size to be updated under the inode->i_lock.
811 * Note: must be called with inode->i_lock held!
812 */
nfs_vmtruncate(struct inode * inode,loff_t offset)813 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
814 {
815 int err;
816
817 err = inode_newsize_ok(inode, offset);
818 if (err)
819 goto out;
820
821 trace_nfs_size_truncate(inode, offset);
822 i_size_write(inode, offset);
823 /* Optimisation */
824 if (offset == 0) {
825 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
826 nfs_ooo_clear(NFS_I(inode));
827 }
828 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
829
830 spin_unlock(&inode->i_lock);
831 truncate_pagecache(inode, offset);
832 nfs_update_delegated_mtime_locked(inode);
833 spin_lock(&inode->i_lock);
834 out:
835 return err;
836 }
837
838 /**
839 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
840 * @inode: pointer to struct inode
841 * @attr: pointer to struct iattr
842 * @fattr: pointer to struct nfs_fattr
843 *
844 * Note: we do this in the *proc.c in order to ensure that
845 * it works for things like exclusive creates too.
846 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)847 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
848 struct nfs_fattr *fattr)
849 {
850 /* Barrier: bump the attribute generation count. */
851 nfs_fattr_set_barrier(fattr);
852
853 spin_lock(&inode->i_lock);
854 NFS_I(inode)->attr_gencount = fattr->gencount;
855 if ((attr->ia_valid & ATTR_SIZE) != 0) {
856 if (!nfs_have_delegated_mtime(inode))
857 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
858 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
859 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
860 nfs_vmtruncate(inode, attr->ia_size);
861 }
862 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
863 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
864 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
865 inode->i_mode & S_ISUID)
866 inode->i_mode &= ~S_ISUID;
867 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
868 inode->i_mode &= ~S_ISGID;
869 if ((attr->ia_valid & ATTR_MODE) != 0) {
870 int mode = attr->ia_mode & S_IALLUGO;
871 mode |= inode->i_mode & ~S_IALLUGO;
872 inode->i_mode = mode;
873 }
874 if ((attr->ia_valid & ATTR_UID) != 0)
875 inode->i_uid = attr->ia_uid;
876 if ((attr->ia_valid & ATTR_GID) != 0)
877 inode->i_gid = attr->ia_gid;
878 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
879 inode_set_ctime_to_ts(inode, fattr->ctime);
880 else
881 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
882 | NFS_INO_INVALID_CTIME);
883 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
884 | NFS_INO_INVALID_ACL);
885 }
886 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
887 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
888 | NFS_INO_INVALID_CTIME);
889 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
890 inode_set_atime_to_ts(inode, fattr->atime);
891 else if (attr->ia_valid & ATTR_ATIME_SET)
892 inode_set_atime_to_ts(inode, attr->ia_atime);
893 else
894 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
895
896 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
897 inode_set_ctime_to_ts(inode, fattr->ctime);
898 else
899 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
900 | NFS_INO_INVALID_CTIME);
901 }
902 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
903 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
904 | NFS_INO_INVALID_CTIME);
905 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
906 inode_set_mtime_to_ts(inode, fattr->mtime);
907 else if (attr->ia_valid & ATTR_MTIME_SET)
908 inode_set_mtime_to_ts(inode, attr->ia_mtime);
909 else
910 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
911
912 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
913 inode_set_ctime_to_ts(inode, fattr->ctime);
914 else
915 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
916 | NFS_INO_INVALID_CTIME);
917 }
918 if (fattr->valid)
919 nfs_update_inode(inode, fattr);
920 spin_unlock(&inode->i_lock);
921 }
922 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
923
924 /*
925 * Don't request help from readdirplus if the file is being written to,
926 * or if attribute caching is turned off
927 */
nfs_getattr_readdirplus_enable(const struct inode * inode)928 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
929 {
930 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
931 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
932 }
933
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)934 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
935 {
936 if (!IS_ROOT(dentry)) {
937 struct dentry *parent = dget_parent(dentry);
938 nfs_readdir_record_entry_cache_miss(d_inode(parent));
939 dput(parent);
940 }
941 }
942
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)943 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
944 {
945 if (!IS_ROOT(dentry)) {
946 struct dentry *parent = dget_parent(dentry);
947 nfs_readdir_record_entry_cache_hit(d_inode(parent));
948 dput(parent);
949 }
950 }
951
nfs_get_valid_attrmask(struct inode * inode)952 static u32 nfs_get_valid_attrmask(struct inode *inode)
953 {
954 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid;
955 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
956 u32 reply_mask = STATX_INO | STATX_TYPE;
957
958 if (!(cache_validity & NFS_INO_INVALID_ATIME))
959 reply_mask |= STATX_ATIME;
960 if (!(cache_validity & NFS_INO_INVALID_CTIME))
961 reply_mask |= STATX_CTIME;
962 if (!(cache_validity & NFS_INO_INVALID_MTIME))
963 reply_mask |= STATX_MTIME;
964 if (!(cache_validity & NFS_INO_INVALID_SIZE))
965 reply_mask |= STATX_SIZE;
966 if (!(cache_validity & NFS_INO_INVALID_NLINK))
967 reply_mask |= STATX_NLINK;
968 if (!(cache_validity & NFS_INO_INVALID_MODE))
969 reply_mask |= STATX_MODE;
970 if (!(cache_validity & NFS_INO_INVALID_OTHER))
971 reply_mask |= STATX_UID | STATX_GID;
972 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
973 reply_mask |= STATX_BLOCKS;
974 if (!(cache_validity & NFS_INO_INVALID_BTIME) &&
975 (fattr_valid & NFS_ATTR_FATTR_BTIME))
976 reply_mask |= STATX_BTIME;
977 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
978 reply_mask |= STATX_CHANGE_COOKIE;
979 return reply_mask;
980 }
981
nfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)982 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
983 struct kstat *stat, u32 request_mask, unsigned int query_flags)
984 {
985 struct inode *inode = d_inode(path->dentry);
986 struct nfs_server *server = NFS_SERVER(inode);
987 u64 fattr_valid = server->fattr_valid;
988 unsigned long cache_validity;
989 int err = 0;
990 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
991 bool do_update = false;
992 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
993
994 trace_nfs_getattr_enter(inode);
995
996 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
997 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
998 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME |
999 STATX_CHANGE_COOKIE;
1000
1001 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME))
1002 request_mask &= ~STATX_BTIME;
1003
1004 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
1005 if (readdirplus_enabled)
1006 nfs_readdirplus_parent_cache_hit(path->dentry);
1007 goto out_no_revalidate;
1008 }
1009
1010 /* Flush out writes to the server in order to update c/mtime/version. */
1011 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
1012 S_ISREG(inode->i_mode)) {
1013 if (nfs_have_delegated_mtime(inode))
1014 filemap_fdatawrite(inode->i_mapping);
1015 else
1016 filemap_write_and_wait(inode->i_mapping);
1017 }
1018
1019 /*
1020 * We may force a getattr if the user cares about atime.
1021 *
1022 * Note that we only have to check the vfsmount flags here:
1023 * - NFS always sets S_NOATIME by so checking it would give a
1024 * bogus result
1025 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
1026 * no point in checking those.
1027 */
1028 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
1029 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1030 request_mask &= ~STATX_ATIME;
1031
1032 /* Is the user requesting attributes that might need revalidation? */
1033 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
1034 STATX_MTIME|STATX_UID|STATX_GID|
1035 STATX_SIZE|STATX_BLOCKS|STATX_BTIME|
1036 STATX_CHANGE_COOKIE)))
1037 goto out_no_revalidate;
1038
1039 /* Check whether the cached attributes are stale */
1040 do_update |= force_sync || nfs_attribute_cache_expired(inode);
1041 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
1042 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
1043 if (request_mask & STATX_ATIME)
1044 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
1045 if (request_mask & STATX_CTIME)
1046 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
1047 if (request_mask & STATX_MTIME)
1048 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
1049 if (request_mask & STATX_SIZE)
1050 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
1051 if (request_mask & STATX_NLINK)
1052 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
1053 if (request_mask & STATX_MODE)
1054 do_update |= cache_validity & NFS_INO_INVALID_MODE;
1055 if (request_mask & (STATX_UID | STATX_GID))
1056 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
1057 if (request_mask & STATX_BLOCKS)
1058 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
1059 if (request_mask & STATX_BTIME)
1060 do_update |= cache_validity & NFS_INO_INVALID_BTIME;
1061
1062 if (do_update) {
1063 if (readdirplus_enabled)
1064 nfs_readdirplus_parent_cache_miss(path->dentry);
1065 err = __nfs_revalidate_inode(server, inode);
1066 if (err)
1067 goto out;
1068 } else if (readdirplus_enabled)
1069 nfs_readdirplus_parent_cache_hit(path->dentry);
1070 out_no_revalidate:
1071 /* Only return attributes that were revalidated. */
1072 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
1073
1074 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1075 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
1076 stat->change_cookie = inode_peek_iversion_raw(inode);
1077 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
1078 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
1079 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
1080 if (S_ISDIR(inode->i_mode))
1081 stat->blksize = NFS_SERVER(inode)->dtsize;
1082 stat->btime = NFS_I(inode)->btime;
1083
1084 /* Special handling for STATX_DIOALIGN and STATX_DIO_READ_ALIGN
1085 * - NFS doesn't have DIO alignment constraints, avoid getting
1086 * these DIO attrs from remote and just respond with most
1087 * accommodating limits (so client will issue supported DIO).
1088 * - this is unintuitive, but the most coarse-grained
1089 * dio_offset_align is the most accommodating.
1090 */
1091 if ((request_mask & (STATX_DIOALIGN | STATX_DIO_READ_ALIGN)) &&
1092 S_ISREG(inode->i_mode)) {
1093 stat->result_mask |= STATX_DIOALIGN | STATX_DIO_READ_ALIGN;
1094 stat->dio_mem_align = 4; /* 4-byte alignment */
1095 stat->dio_offset_align = PAGE_SIZE;
1096 stat->dio_read_offset_align = stat->dio_offset_align;
1097 }
1098 out:
1099 trace_nfs_getattr_exit(inode, err);
1100 return err;
1101 }
1102 EXPORT_SYMBOL_GPL(nfs_getattr);
1103
nfs_init_lock_context(struct nfs_lock_context * l_ctx)1104 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
1105 {
1106 refcount_set(&l_ctx->count, 1);
1107 l_ctx->lockowner = current->files;
1108 INIT_LIST_HEAD(&l_ctx->list);
1109 atomic_set(&l_ctx->io_count, 0);
1110 }
1111
__nfs_find_lock_context(struct nfs_open_context * ctx)1112 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
1113 {
1114 struct nfs_lock_context *pos;
1115
1116 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
1117 if (pos->lockowner != current->files)
1118 continue;
1119 if (refcount_inc_not_zero(&pos->count))
1120 return pos;
1121 }
1122 return NULL;
1123 }
1124
nfs_get_lock_context(struct nfs_open_context * ctx)1125 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
1126 {
1127 struct nfs_lock_context *res, *new = NULL;
1128 struct inode *inode = d_inode(ctx->dentry);
1129
1130 rcu_read_lock();
1131 res = __nfs_find_lock_context(ctx);
1132 rcu_read_unlock();
1133 if (res == NULL) {
1134 new = kmalloc_obj(*new, GFP_KERNEL_ACCOUNT);
1135 if (new == NULL)
1136 return ERR_PTR(-ENOMEM);
1137 nfs_init_lock_context(new);
1138 spin_lock(&inode->i_lock);
1139 res = __nfs_find_lock_context(ctx);
1140 if (res == NULL) {
1141 new->open_context = get_nfs_open_context(ctx);
1142 if (new->open_context) {
1143 list_add_tail_rcu(&new->list,
1144 &ctx->lock_context.list);
1145 res = new;
1146 new = NULL;
1147 } else
1148 res = ERR_PTR(-EBADF);
1149 }
1150 spin_unlock(&inode->i_lock);
1151 kfree(new);
1152 }
1153 return res;
1154 }
1155 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
1156
nfs_put_lock_context(struct nfs_lock_context * l_ctx)1157 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
1158 {
1159 struct nfs_open_context *ctx = l_ctx->open_context;
1160 struct inode *inode = d_inode(ctx->dentry);
1161
1162 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
1163 return;
1164 list_del_rcu(&l_ctx->list);
1165 spin_unlock(&inode->i_lock);
1166 put_nfs_open_context(ctx);
1167 kfree_rcu(l_ctx, rcu_head);
1168 }
1169 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
1170
1171 /**
1172 * nfs_close_context - Common close_context() routine NFSv2/v3
1173 * @ctx: pointer to context
1174 * @is_sync: is this a synchronous close
1175 *
1176 * Ensure that the attributes are up to date if we're mounted
1177 * with close-to-open semantics and we have cached data that will
1178 * need to be revalidated on open.
1179 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1180 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1181 {
1182 struct nfs_inode *nfsi;
1183 struct inode *inode;
1184
1185 if (!(ctx->mode & FMODE_WRITE))
1186 return;
1187 if (!is_sync)
1188 return;
1189 inode = d_inode(ctx->dentry);
1190 if (nfs_have_read_or_write_delegation(inode))
1191 return;
1192 nfsi = NFS_I(inode);
1193 if (inode->i_mapping->nrpages == 0)
1194 return;
1195 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1196 return;
1197 if (!list_empty(&nfsi->open_files))
1198 return;
1199 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1200 return;
1201 nfs_revalidate_inode(inode,
1202 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1203 }
1204 EXPORT_SYMBOL_GPL(nfs_close_context);
1205
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1206 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1207 fmode_t f_mode,
1208 struct file *filp)
1209 {
1210 struct nfs_open_context *ctx;
1211
1212 ctx = kmalloc_obj(*ctx, GFP_KERNEL_ACCOUNT);
1213 if (!ctx)
1214 return ERR_PTR(-ENOMEM);
1215 nfs_sb_active(dentry->d_sb);
1216 ctx->dentry = dget(dentry);
1217 if (filp)
1218 ctx->cred = get_cred(filp->f_cred);
1219 else
1220 ctx->cred = get_current_cred();
1221 rcu_assign_pointer(ctx->ll_cred, NULL);
1222 ctx->state = NULL;
1223 ctx->mode = f_mode;
1224 ctx->flags = 0;
1225 ctx->error = 0;
1226 ctx->flock_owner = (fl_owner_t)filp;
1227 nfs_init_lock_context(&ctx->lock_context);
1228 ctx->lock_context.open_context = ctx;
1229 INIT_LIST_HEAD(&ctx->list);
1230 ctx->mdsthreshold = NULL;
1231 nfs_localio_file_init(&ctx->nfl);
1232
1233 return ctx;
1234 }
1235 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1236
get_nfs_open_context(struct nfs_open_context * ctx)1237 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1238 {
1239 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1240 return ctx;
1241 return NULL;
1242 }
1243 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1244
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1245 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1246 {
1247 struct inode *inode = d_inode(ctx->dentry);
1248 struct super_block *sb = ctx->dentry->d_sb;
1249
1250 if (!refcount_dec_and_test(&ctx->lock_context.count))
1251 return;
1252 if (!list_empty(&ctx->list)) {
1253 spin_lock(&inode->i_lock);
1254 list_del_rcu(&ctx->list);
1255 spin_unlock(&inode->i_lock);
1256 }
1257 if (inode != NULL)
1258 NFS_PROTO(inode)->close_context(ctx, is_sync);
1259 put_cred(ctx->cred);
1260 dput(ctx->dentry);
1261 nfs_sb_deactive(sb);
1262 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1263 kfree(ctx->mdsthreshold);
1264 nfs_close_local_fh(&ctx->nfl);
1265 kfree_rcu(ctx, rcu_head);
1266 }
1267
put_nfs_open_context(struct nfs_open_context * ctx)1268 void put_nfs_open_context(struct nfs_open_context *ctx)
1269 {
1270 __put_nfs_open_context(ctx, 0);
1271 }
1272 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1273
put_nfs_open_context_sync(struct nfs_open_context * ctx)1274 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1275 {
1276 __put_nfs_open_context(ctx, 1);
1277 }
1278
1279 /*
1280 * Ensure that mmap has a recent RPC credential for use when writing out
1281 * shared pages
1282 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1283 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1284 {
1285 struct inode *inode = d_inode(ctx->dentry);
1286 struct nfs_inode *nfsi = NFS_I(inode);
1287
1288 spin_lock(&inode->i_lock);
1289 if (list_empty(&nfsi->open_files) &&
1290 nfs_ooo_test(nfsi))
1291 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1292 NFS_INO_REVAL_FORCED);
1293 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1294 spin_unlock(&inode->i_lock);
1295 }
1296 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1297
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1298 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1299 {
1300 filp->private_data = get_nfs_open_context(ctx);
1301 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1302 if (list_empty(&ctx->list))
1303 nfs_inode_attach_open_context(ctx);
1304 }
1305 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1306
1307 /*
1308 * Given an inode, search for an open context with the desired characteristics
1309 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1310 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1311 {
1312 struct nfs_inode *nfsi = NFS_I(inode);
1313 struct nfs_open_context *pos, *ctx = NULL;
1314
1315 rcu_read_lock();
1316 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1317 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1318 continue;
1319 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1320 continue;
1321 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1322 continue;
1323 ctx = get_nfs_open_context(pos);
1324 if (ctx)
1325 break;
1326 }
1327 rcu_read_unlock();
1328 return ctx;
1329 }
1330
nfs_file_clear_open_context(struct file * filp)1331 void nfs_file_clear_open_context(struct file *filp)
1332 {
1333 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1334
1335 if (ctx) {
1336 struct inode *inode = d_inode(ctx->dentry);
1337
1338 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1339 /*
1340 * We fatal error on write before. Try to writeback
1341 * every page again.
1342 */
1343 if (ctx->error < 0)
1344 invalidate_inode_pages2(inode->i_mapping);
1345 filp->private_data = NULL;
1346 put_nfs_open_context_sync(ctx);
1347 }
1348 }
1349
1350 /*
1351 * These allocate and release file read/write context information.
1352 */
nfs_open(struct inode * inode,struct file * filp)1353 int nfs_open(struct inode *inode, struct file *filp)
1354 {
1355 struct nfs_open_context *ctx;
1356
1357 ctx = alloc_nfs_open_context(file_dentry(filp),
1358 flags_to_mode(filp->f_flags), filp);
1359 if (IS_ERR(ctx))
1360 return PTR_ERR(ctx);
1361 nfs_file_set_open_context(filp, ctx);
1362 put_nfs_open_context(ctx);
1363 nfs_fscache_open_file(inode, filp);
1364 return 0;
1365 }
1366
1367 /*
1368 * This function is called whenever some part of NFS notices that
1369 * the cached attributes have to be refreshed.
1370 */
1371 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1372 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1373 {
1374 int status = -ESTALE;
1375 struct nfs_fattr *fattr = NULL;
1376 struct nfs_inode *nfsi = NFS_I(inode);
1377
1378 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1379 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1380
1381 trace_nfs_revalidate_inode_enter(inode);
1382
1383 if (is_bad_inode(inode))
1384 goto out;
1385 if (NFS_STALE(inode))
1386 goto out;
1387
1388 /* pNFS: Attributes aren't updated until we layoutcommit */
1389 if (S_ISREG(inode->i_mode)) {
1390 status = pnfs_sync_inode(inode, false);
1391 if (status)
1392 goto out;
1393 } else if (nfs_have_directory_delegation(inode)) {
1394 status = 0;
1395 goto out;
1396 }
1397
1398 status = -ENOMEM;
1399 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1400 if (fattr == NULL)
1401 goto out;
1402
1403 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1404
1405 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1406 if (status != 0) {
1407 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1408 inode->i_sb->s_id,
1409 (unsigned long long)NFS_FILEID(inode), status);
1410 switch (status) {
1411 case -ETIMEDOUT:
1412 /* A soft timeout occurred. Use cached information? */
1413 if (server->flags & NFS_MOUNT_SOFTREVAL)
1414 status = 0;
1415 break;
1416 case -ESTALE:
1417 if (!S_ISDIR(inode->i_mode))
1418 nfs_set_inode_stale(inode);
1419 else
1420 nfs_zap_caches(inode);
1421 }
1422 goto out;
1423 }
1424
1425 status = nfs_refresh_inode(inode, fattr);
1426 if (status) {
1427 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1428 inode->i_sb->s_id,
1429 (unsigned long long)NFS_FILEID(inode), status);
1430 goto out;
1431 }
1432
1433 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1434 nfs_zap_acl_cache(inode);
1435
1436 nfs_setsecurity(inode, fattr);
1437
1438 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1439 inode->i_sb->s_id,
1440 (unsigned long long)NFS_FILEID(inode));
1441
1442 out:
1443 nfs_free_fattr(fattr);
1444 trace_nfs_revalidate_inode_exit(inode, status);
1445 return status;
1446 }
1447
nfs_attribute_cache_expired(struct inode * inode)1448 int nfs_attribute_cache_expired(struct inode *inode)
1449 {
1450 if (nfs_have_delegated_attributes(inode))
1451 return 0;
1452 return nfs_attribute_timeout(inode);
1453 }
1454
1455 /**
1456 * nfs_revalidate_inode - Revalidate the inode attributes
1457 * @inode: pointer to inode struct
1458 * @flags: cache flags to check
1459 *
1460 * Updates inode attribute information by retrieving the data from the server.
1461 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1462 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1463 {
1464 if (!nfs_check_cache_invalid(inode, flags))
1465 return NFS_STALE(inode) ? -ESTALE : 0;
1466 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1467 }
1468 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1469
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1470 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1471 {
1472 int ret;
1473
1474 nfs_fscache_invalidate(inode, 0);
1475 if (mapping->nrpages != 0) {
1476 if (S_ISREG(inode->i_mode)) {
1477 ret = nfs_sync_mapping(mapping);
1478 if (ret < 0)
1479 return ret;
1480 }
1481 ret = invalidate_inode_pages2(mapping);
1482 if (ret < 0)
1483 return ret;
1484 }
1485 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1486
1487 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1488 inode->i_sb->s_id,
1489 (unsigned long long)NFS_FILEID(inode));
1490 return 0;
1491 }
1492
1493 /**
1494 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1495 * @mapping: pointer to mapping
1496 *
1497 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1498 */
nfs_clear_invalid_mapping(struct address_space * mapping)1499 int nfs_clear_invalid_mapping(struct address_space *mapping)
1500 {
1501 struct inode *inode = mapping->host;
1502 struct nfs_inode *nfsi = NFS_I(inode);
1503 unsigned long *bitlock = &nfsi->flags;
1504 int ret = 0;
1505
1506 /*
1507 * We must clear NFS_INO_INVALID_DATA first to ensure that
1508 * invalidations that come in while we're shooting down the mappings
1509 * are respected. But, that leaves a race window where one revalidator
1510 * can clear the flag, and then another checks it before the mapping
1511 * gets invalidated. Fix that by serializing access to this part of
1512 * the function.
1513 *
1514 * At the same time, we need to allow other tasks to see whether we
1515 * might be in the middle of invalidating the pages, so we only set
1516 * the bit lock here if it looks like we're going to be doing that.
1517 */
1518 for (;;) {
1519 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1520 nfs_wait_bit_killable,
1521 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1522 if (ret)
1523 goto out;
1524 smp_rmb(); /* pairs with smp_wmb() below */
1525 if (test_bit(NFS_INO_INVALIDATING, bitlock))
1526 continue;
1527 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */
1528 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA))
1529 goto out;
1530 /* Slow-path that double-checks with spinlock held */
1531 spin_lock(&inode->i_lock);
1532 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1533 spin_unlock(&inode->i_lock);
1534 continue;
1535 }
1536 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1537 break;
1538 spin_unlock(&inode->i_lock);
1539 goto out;
1540 }
1541
1542 set_bit(NFS_INO_INVALIDATING, bitlock);
1543 smp_wmb();
1544 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1545 nfs_ooo_clear(nfsi);
1546 spin_unlock(&inode->i_lock);
1547 trace_nfs_invalidate_mapping_enter(inode);
1548 ret = nfs_invalidate_mapping(inode, mapping);
1549 trace_nfs_invalidate_mapping_exit(inode, ret);
1550
1551 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1552 smp_mb__after_atomic();
1553 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1554 out:
1555 return ret;
1556 }
1557
nfs_mapping_need_revalidate_inode(struct inode * inode)1558 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1559 {
1560 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1561 NFS_STALE(inode);
1562 }
1563
nfs_revalidate_mapping_rcu(struct inode * inode)1564 int nfs_revalidate_mapping_rcu(struct inode *inode)
1565 {
1566 struct nfs_inode *nfsi = NFS_I(inode);
1567 unsigned long *bitlock = &nfsi->flags;
1568 int ret = 0;
1569
1570 if (IS_SWAPFILE(inode))
1571 goto out;
1572 if (nfs_mapping_need_revalidate_inode(inode)) {
1573 ret = -ECHILD;
1574 goto out;
1575 }
1576 spin_lock(&inode->i_lock);
1577 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1578 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1579 ret = -ECHILD;
1580 spin_unlock(&inode->i_lock);
1581 out:
1582 return ret;
1583 }
1584
1585 /**
1586 * nfs_revalidate_mapping - Revalidate the pagecache
1587 * @inode: pointer to host inode
1588 * @mapping: pointer to mapping
1589 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1590 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1591 {
1592 /* swapfiles are not supposed to be shared. */
1593 if (IS_SWAPFILE(inode))
1594 return 0;
1595
1596 if (nfs_mapping_need_revalidate_inode(inode)) {
1597 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1598 if (ret < 0)
1599 return ret;
1600 }
1601
1602 return nfs_clear_invalid_mapping(mapping);
1603 }
1604
nfs_file_has_writers(struct nfs_inode * nfsi)1605 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1606 {
1607 struct inode *inode = &nfsi->vfs_inode;
1608
1609 if (!S_ISREG(inode->i_mode))
1610 return false;
1611 if (list_empty(&nfsi->open_files))
1612 return false;
1613 return inode_is_open_for_write(inode);
1614 }
1615
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1616 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1617 {
1618 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1619 }
1620
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1621 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1622 {
1623 struct timespec64 ts;
1624
1625 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1626 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1627 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1628 inode_set_iversion_raw(inode, fattr->change_attr);
1629 if (S_ISDIR(inode->i_mode))
1630 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1631 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1632 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1633 }
1634 /* If we have atomic WCC data, we may update some attributes */
1635 ts = inode_get_ctime(inode);
1636 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1637 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1638 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1639 inode_set_ctime_to_ts(inode, fattr->ctime);
1640 }
1641
1642 ts = inode_get_mtime(inode);
1643 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1644 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1645 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1646 inode_set_mtime_to_ts(inode, fattr->mtime);
1647 }
1648 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1649 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1650 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1651 && !nfs_have_writebacks(inode)) {
1652 trace_nfs_size_wcc(inode, fattr->size);
1653 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1654 }
1655 }
1656
1657 /**
1658 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1659 * @inode: pointer to inode
1660 * @fattr: updated attributes
1661 *
1662 * Verifies the attribute cache. If we have just changed the attributes,
1663 * so that fattr carries weak cache consistency data, then it may
1664 * also update the ctime/mtime/change_attribute.
1665 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1666 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1667 {
1668 struct nfs_inode *nfsi = NFS_I(inode);
1669 loff_t cur_size, new_isize;
1670 unsigned long invalid = 0;
1671 struct timespec64 ts;
1672
1673 if (nfs_have_delegated_attributes(inode))
1674 return 0;
1675
1676 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1677 /* Only a mounted-on-fileid? Just exit */
1678 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1679 return 0;
1680 /* Has the inode gone and changed behind our back? */
1681 } else if (nfsi->fileid != fattr->fileid) {
1682 /* Is this perhaps the mounted-on fileid? */
1683 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1684 nfsi->fileid == fattr->mounted_on_fileid)
1685 return 0;
1686 return -ESTALE;
1687 }
1688 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1689 return -ESTALE;
1690
1691
1692 if (!nfs_file_has_buffered_writers(nfsi)) {
1693 /* Verify a few of the more important attributes */
1694 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1695 invalid |= NFS_INO_INVALID_CHANGE;
1696
1697 ts = inode_get_mtime(inode);
1698 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1699 invalid |= NFS_INO_INVALID_MTIME;
1700
1701 ts = inode_get_ctime(inode);
1702 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1703 invalid |= NFS_INO_INVALID_CTIME;
1704
1705 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1706 cur_size = i_size_read(inode);
1707 new_isize = nfs_size_to_loff_t(fattr->size);
1708 if (cur_size != new_isize)
1709 invalid |= NFS_INO_INVALID_SIZE;
1710 }
1711 }
1712
1713 /* Have any file permissions changed? */
1714 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1715 invalid |= NFS_INO_INVALID_MODE;
1716 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1717 invalid |= NFS_INO_INVALID_OTHER;
1718 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1719 invalid |= NFS_INO_INVALID_OTHER;
1720
1721 /* Has the link count changed? */
1722 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1723 invalid |= NFS_INO_INVALID_NLINK;
1724
1725 ts = inode_get_atime(inode);
1726 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1727 invalid |= NFS_INO_INVALID_ATIME;
1728
1729 if (invalid != 0)
1730 nfs_set_cache_invalid(inode, invalid);
1731
1732 nfsi->read_cache_jiffies = fattr->time_start;
1733 return 0;
1734 }
1735
1736 static atomic_long_t nfs_attr_generation_counter;
1737
nfs_read_attr_generation_counter(void)1738 static unsigned long nfs_read_attr_generation_counter(void)
1739 {
1740 return atomic_long_read(&nfs_attr_generation_counter);
1741 }
1742
nfs_inc_attr_generation_counter(void)1743 unsigned long nfs_inc_attr_generation_counter(void)
1744 {
1745 return atomic_long_inc_return(&nfs_attr_generation_counter);
1746 }
1747 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1748
nfs_fattr_init(struct nfs_fattr * fattr)1749 void nfs_fattr_init(struct nfs_fattr *fattr)
1750 {
1751 fattr->valid = 0;
1752 fattr->time_start = jiffies;
1753 fattr->gencount = nfs_inc_attr_generation_counter();
1754 fattr->owner_name = NULL;
1755 fattr->group_name = NULL;
1756 fattr->mdsthreshold = NULL;
1757 }
1758 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1759
1760 /**
1761 * nfs_fattr_set_barrier
1762 * @fattr: attributes
1763 *
1764 * Used to set a barrier after an attribute was updated. This
1765 * barrier ensures that older attributes from RPC calls that may
1766 * have raced with our update cannot clobber these new values.
1767 * Note that you are still responsible for ensuring that other
1768 * operations which change the attribute on the server do not
1769 * collide.
1770 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1771 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1772 {
1773 fattr->gencount = nfs_inc_attr_generation_counter();
1774 }
1775
nfs_alloc_fattr(void)1776 struct nfs_fattr *nfs_alloc_fattr(void)
1777 {
1778 struct nfs_fattr *fattr;
1779
1780 fattr = kmalloc_obj(*fattr);
1781 if (fattr != NULL) {
1782 nfs_fattr_init(fattr);
1783 fattr->label = NULL;
1784 }
1785 return fattr;
1786 }
1787 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1788
nfs_alloc_fattr_with_label(struct nfs_server * server)1789 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1790 {
1791 struct nfs_fattr *fattr = nfs_alloc_fattr();
1792
1793 if (!fattr)
1794 return NULL;
1795
1796 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1797 if (IS_ERR(fattr->label)) {
1798 kfree(fattr);
1799 return NULL;
1800 }
1801
1802 return fattr;
1803 }
1804 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1805
nfs_alloc_fhandle(void)1806 struct nfs_fh *nfs_alloc_fhandle(void)
1807 {
1808 struct nfs_fh *fh;
1809
1810 fh = kmalloc_obj(struct nfs_fh);
1811 if (fh != NULL)
1812 fh->size = 0;
1813 return fh;
1814 }
1815 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1816
1817 #ifdef NFS_DEBUG
1818 /*
1819 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1820 * in the same way that wireshark does
1821 *
1822 * @fh: file handle
1823 *
1824 * For debugging only.
1825 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1826 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1827 {
1828 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1829 * not on the result */
1830 return nfs_fhandle_hash(fh);
1831 }
1832 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1833
1834 /*
1835 * _nfs_display_fhandle - display an NFS file handle on the console
1836 *
1837 * @fh: file handle to display
1838 * @caption: display caption
1839 *
1840 * For debugging only.
1841 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1842 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1843 {
1844 unsigned short i;
1845
1846 if (fh == NULL || fh->size == 0) {
1847 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1848 return;
1849 }
1850
1851 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1852 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1853 for (i = 0; i < fh->size; i += 16) {
1854 __be32 *pos = (__be32 *)&fh->data[i];
1855
1856 switch ((fh->size - i - 1) >> 2) {
1857 case 0:
1858 printk(KERN_DEFAULT " %08x\n",
1859 be32_to_cpup(pos));
1860 break;
1861 case 1:
1862 printk(KERN_DEFAULT " %08x %08x\n",
1863 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1864 break;
1865 case 2:
1866 printk(KERN_DEFAULT " %08x %08x %08x\n",
1867 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1868 be32_to_cpup(pos + 2));
1869 break;
1870 default:
1871 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1872 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1873 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1874 }
1875 }
1876 }
1877 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1878 #endif
1879
1880 /**
1881 * nfs_inode_attrs_cmp_generic - compare attributes
1882 * @fattr: attributes
1883 * @inode: pointer to inode
1884 *
1885 * Attempt to divine whether or not an RPC call reply carrying stale
1886 * attributes got scheduled after another call carrying updated ones.
1887 * Note also the check for wraparound of 'attr_gencount'
1888 *
1889 * The function returns '1' if it thinks the attributes in @fattr are
1890 * more recent than the ones cached in @inode. Otherwise it returns
1891 * the value '0'.
1892 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1893 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1894 const struct inode *inode)
1895 {
1896 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1897
1898 return (long)(fattr->gencount - attr_gencount) > 0 ||
1899 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1900 }
1901
1902 /**
1903 * nfs_inode_attrs_cmp_monotonic - compare attributes
1904 * @fattr: attributes
1905 * @inode: pointer to inode
1906 *
1907 * Attempt to divine whether or not an RPC call reply carrying stale
1908 * attributes got scheduled after another call carrying updated ones.
1909 *
1910 * We assume that the server observes monotonic semantics for
1911 * the change attribute, so a larger value means that the attributes in
1912 * @fattr are more recent, in which case the function returns the
1913 * value '1'.
1914 * A return value of '0' indicates no measurable change
1915 * A return value of '-1' means that the attributes in @inode are
1916 * more recent.
1917 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1918 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1919 const struct inode *inode)
1920 {
1921 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1922 if (diff > 0)
1923 return 1;
1924 return diff == 0 ? 0 : -1;
1925 }
1926
1927 /**
1928 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1929 * @fattr: attributes
1930 * @inode: pointer to inode
1931 *
1932 * Attempt to divine whether or not an RPC call reply carrying stale
1933 * attributes got scheduled after another call carrying updated ones.
1934 *
1935 * We assume that the server observes strictly monotonic semantics for
1936 * the change attribute, so a larger value means that the attributes in
1937 * @fattr are more recent, in which case the function returns the
1938 * value '1'.
1939 * A return value of '-1' means that the attributes in @inode are
1940 * more recent or unchanged.
1941 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1942 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1943 const struct inode *inode)
1944 {
1945 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1946 }
1947
1948 /**
1949 * nfs_inode_attrs_cmp - compare attributes
1950 * @fattr: attributes
1951 * @inode: pointer to inode
1952 *
1953 * This function returns '1' if it thinks the attributes in @fattr are
1954 * more recent than the ones cached in @inode. It returns '-1' if
1955 * the attributes in @inode are more recent than the ones in @fattr,
1956 * and it returns 0 if not sure.
1957 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1958 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1959 const struct inode *inode)
1960 {
1961 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1962 return 1;
1963 switch (NFS_SERVER(inode)->change_attr_type) {
1964 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1965 break;
1966 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1967 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1968 break;
1969 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1970 default:
1971 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1972 break;
1973 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1974 }
1975 return 0;
1976 }
1977
1978 /**
1979 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1980 * @fattr: attributes
1981 * @inode: pointer to inode
1982 *
1983 * Returns '1' if the last attribute update left the inode cached
1984 * attributes in a partially unrevalidated state, and @fattr
1985 * matches the change attribute of that partial update.
1986 * Otherwise returns '0'.
1987 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1988 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1989 const struct inode *inode)
1990 {
1991 const unsigned long check_valid =
1992 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1993 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1994 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1995 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME;
1996 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1997 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1998
1999 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
2000 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
2001 (cache_validity & check_valid) != 0 &&
2002 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2003 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
2004 return 1;
2005 return 0;
2006 }
2007
nfs_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)2008 static void nfs_ooo_merge(struct nfs_inode *nfsi,
2009 u64 start, u64 end)
2010 {
2011 int i, cnt;
2012
2013 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
2014 /* No point merging anything */
2015 return;
2016
2017 if (!nfsi->ooo) {
2018 nfsi->ooo = kmalloc_obj(*nfsi->ooo, GFP_ATOMIC);
2019 if (!nfsi->ooo) {
2020 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2021 return;
2022 }
2023 nfsi->ooo->cnt = 0;
2024 }
2025
2026 /* add this range, merging if possible */
2027 cnt = nfsi->ooo->cnt;
2028 for (i = 0; i < cnt; i++) {
2029 if (end == nfsi->ooo->gap[i].start)
2030 end = nfsi->ooo->gap[i].end;
2031 else if (start == nfsi->ooo->gap[i].end)
2032 start = nfsi->ooo->gap[i].start;
2033 else
2034 continue;
2035 /* Remove 'i' from table and loop to insert the new range */
2036 cnt -= 1;
2037 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
2038 i = -1;
2039 }
2040 if (start != end) {
2041 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
2042 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2043 kfree(nfsi->ooo);
2044 nfsi->ooo = NULL;
2045 return;
2046 }
2047 nfsi->ooo->gap[cnt].start = start;
2048 nfsi->ooo->gap[cnt].end = end;
2049 cnt += 1;
2050 }
2051 nfsi->ooo->cnt = cnt;
2052 }
2053
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)2054 static void nfs_ooo_record(struct nfs_inode *nfsi,
2055 struct nfs_fattr *fattr)
2056 {
2057 /* This reply was out-of-order, so record in the
2058 * pre/post change id, possibly cancelling
2059 * gaps created when iversion was jumpped forward.
2060 */
2061 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
2062 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
2063 nfs_ooo_merge(nfsi,
2064 fattr->change_attr,
2065 fattr->pre_change_attr);
2066 }
2067
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)2068 static int nfs_refresh_inode_locked(struct inode *inode,
2069 struct nfs_fattr *fattr)
2070 {
2071 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2072 int ret = 0;
2073
2074 trace_nfs_refresh_inode_enter(inode);
2075
2076 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
2077 ret = nfs_update_inode(inode, fattr);
2078 else {
2079 nfs_ooo_record(NFS_I(inode), fattr);
2080
2081 if (attr_cmp == 0)
2082 ret = nfs_check_inode_attributes(inode, fattr);
2083 }
2084
2085 trace_nfs_refresh_inode_exit(inode, ret);
2086 return ret;
2087 }
2088
2089 /**
2090 * nfs_refresh_inode - try to update the inode attribute cache
2091 * @inode: pointer to inode
2092 * @fattr: updated attributes
2093 *
2094 * Check that an RPC call that returned attributes has not overlapped with
2095 * other recent updates of the inode metadata, then decide whether it is
2096 * safe to do a full update of the inode attributes, or whether just to
2097 * call nfs_check_inode_attributes.
2098 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)2099 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
2100 {
2101 int status;
2102
2103 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2104 return 0;
2105 spin_lock(&inode->i_lock);
2106 status = nfs_refresh_inode_locked(inode, fattr);
2107 spin_unlock(&inode->i_lock);
2108
2109 return status;
2110 }
2111 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
2112
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)2113 static int nfs_post_op_update_inode_locked(struct inode *inode,
2114 struct nfs_fattr *fattr, unsigned int invalid)
2115 {
2116 if (S_ISDIR(inode->i_mode))
2117 invalid |= NFS_INO_INVALID_DATA;
2118 nfs_set_cache_invalid(inode, invalid);
2119 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2120 return 0;
2121 return nfs_refresh_inode_locked(inode, fattr);
2122 }
2123
2124 /**
2125 * nfs_post_op_update_inode - try to update the inode attribute cache
2126 * @inode: pointer to inode
2127 * @fattr: updated attributes
2128 *
2129 * After an operation that has changed the inode metadata, mark the
2130 * attribute cache as being invalid, then try to update it.
2131 *
2132 * NB: if the server didn't return any post op attributes, this
2133 * function will force the retrieval of attributes before the next
2134 * NFS request. Thus it should be used only for operations that
2135 * are expected to change one or more attributes, to avoid
2136 * unnecessary NFS requests and trips through nfs_update_inode().
2137 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)2138 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2139 {
2140 int status;
2141
2142 spin_lock(&inode->i_lock);
2143 nfs_fattr_set_barrier(fattr);
2144 status = nfs_post_op_update_inode_locked(inode, fattr,
2145 NFS_INO_INVALID_CHANGE
2146 | NFS_INO_INVALID_CTIME
2147 | NFS_INO_REVAL_FORCED);
2148 spin_unlock(&inode->i_lock);
2149
2150 return status;
2151 }
2152 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
2153
2154 /**
2155 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
2156 * @inode: pointer to inode
2157 * @fattr: updated attributes
2158 *
2159 * After an operation that has changed the inode metadata, mark the
2160 * attribute cache as being invalid, then try to update it. Fake up
2161 * weak cache consistency data, if none exist.
2162 *
2163 * This function is mainly designed to be used by the ->write_done() functions.
2164 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)2165 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
2166 {
2167 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2168 int status;
2169
2170 /* Don't do a WCC update if these attributes are already stale */
2171 if (attr_cmp < 0)
2172 return 0;
2173 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
2174 /* Record the pre/post change info before clearing PRECHANGE */
2175 nfs_ooo_record(NFS_I(inode), fattr);
2176 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
2177 | NFS_ATTR_FATTR_PRESIZE
2178 | NFS_ATTR_FATTR_PREMTIME
2179 | NFS_ATTR_FATTR_PRECTIME);
2180 goto out_noforce;
2181 }
2182 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2183 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
2184 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
2185 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
2186 }
2187 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
2188 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2189 fattr->pre_ctime = inode_get_ctime(inode);
2190 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2191 }
2192 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2193 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2194 fattr->pre_mtime = inode_get_mtime(inode);
2195 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2196 }
2197 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2198 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2199 fattr->pre_size = i_size_read(inode);
2200 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2201 }
2202 out_noforce:
2203 status = nfs_post_op_update_inode_locked(inode, fattr,
2204 NFS_INO_INVALID_CHANGE
2205 | NFS_INO_INVALID_CTIME
2206 | NFS_INO_INVALID_MTIME
2207 | NFS_INO_INVALID_BLOCKS);
2208 return status;
2209 }
2210
2211 /**
2212 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2213 * @inode: pointer to inode
2214 * @fattr: updated attributes
2215 *
2216 * After an operation that has changed the inode metadata, mark the
2217 * attribute cache as being invalid, then try to update it. Fake up
2218 * weak cache consistency data, if none exist.
2219 *
2220 * This function is mainly designed to be used by the ->write_done() functions.
2221 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2222 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2223 {
2224 int status;
2225
2226 spin_lock(&inode->i_lock);
2227 nfs_fattr_set_barrier(fattr);
2228 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2229 spin_unlock(&inode->i_lock);
2230 return status;
2231 }
2232 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2233
2234
2235 /*
2236 * Many nfs protocol calls return the new file attributes after
2237 * an operation. Here we update the inode to reflect the state
2238 * of the server's inode.
2239 *
2240 * This is a bit tricky because we have to make sure all dirty pages
2241 * have been sent off to the server before calling invalidate_inode_pages.
2242 * To make sure no other process adds more write requests while we try
2243 * our best to flush them, we make them sleep during the attribute refresh.
2244 *
2245 * A very similar scenario holds for the dir cache.
2246 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2247 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2248 {
2249 struct nfs_server *server = NFS_SERVER(inode);
2250 struct nfs_inode *nfsi = NFS_I(inode);
2251 loff_t cur_isize, new_isize;
2252 u64 fattr_supported = server->fattr_valid;
2253 unsigned long invalid = 0;
2254 unsigned long now = jiffies;
2255 unsigned long save_cache_validity;
2256 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2257 bool cache_revalidated = true;
2258 bool attr_changed = false;
2259 bool have_delegation;
2260
2261 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%llx)\n",
2262 __func__, inode->i_sb->s_id, inode->i_ino,
2263 nfs_display_fhandle_hash(NFS_FH(inode)),
2264 icount_read(inode), fattr->valid);
2265
2266 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2267 /* Only a mounted-on-fileid? Just exit */
2268 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2269 return 0;
2270 /* Has the inode gone and changed behind our back? */
2271 } else if (nfsi->fileid != fattr->fileid) {
2272 /* Is this perhaps the mounted-on fileid? */
2273 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2274 nfsi->fileid == fattr->mounted_on_fileid)
2275 return 0;
2276 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2277 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2278 NFS_SERVER(inode)->nfs_client->cl_hostname,
2279 inode->i_sb->s_id, (long long)nfsi->fileid,
2280 (long long)fattr->fileid);
2281 goto out_err;
2282 }
2283
2284 /*
2285 * Make sure the inode's type hasn't changed.
2286 */
2287 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2288 /*
2289 * Big trouble! The inode has become a different object.
2290 */
2291 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2292 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2293 goto out_err;
2294 }
2295
2296 /* Update the fsid? */
2297 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2298 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2299 !IS_AUTOMOUNT(inode))
2300 server->fsid = fattr->fsid;
2301
2302 /* Save the delegation state before clearing cache_validity */
2303 have_delegation = nfs_have_delegated_attributes(inode);
2304
2305 /*
2306 * Update the read time so we don't revalidate too often.
2307 */
2308 nfsi->read_cache_jiffies = fattr->time_start;
2309
2310 /* Fix up any delegated attributes in the struct nfs_fattr */
2311 nfs_fattr_fixup_delegated(inode, fattr);
2312
2313 save_cache_validity = nfsi->cache_validity;
2314 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2315 | NFS_INO_INVALID_ATIME
2316 | NFS_INO_REVAL_FORCED
2317 | NFS_INO_INVALID_BLOCKS);
2318
2319 /* Do atomic weak cache consistency updates */
2320 nfs_wcc_update_inode(inode, fattr);
2321
2322 if (pnfs_layoutcommit_outstanding(inode)) {
2323 nfsi->cache_validity |=
2324 save_cache_validity &
2325 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2326 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2327 NFS_INO_INVALID_BLOCKS);
2328 cache_revalidated = false;
2329 }
2330
2331 /* More cache consistency checks */
2332 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2333 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2334 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2335 /* There is one remaining gap that hasn't been
2336 * merged into iversion - do that now.
2337 */
2338 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2339 kfree(nfsi->ooo);
2340 nfsi->ooo = NULL;
2341 }
2342 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2343 /* Could it be a race with writeback? */
2344 if (!(have_writers || have_delegation)) {
2345 invalid |= NFS_INO_INVALID_DATA
2346 | NFS_INO_INVALID_ACCESS
2347 | NFS_INO_INVALID_ACL
2348 | NFS_INO_INVALID_XATTR;
2349 /* Force revalidate of all attributes */
2350 save_cache_validity |= NFS_INO_INVALID_CTIME
2351 | NFS_INO_INVALID_MTIME
2352 | NFS_INO_INVALID_SIZE
2353 | NFS_INO_INVALID_BLOCKS
2354 | NFS_INO_INVALID_NLINK
2355 | NFS_INO_INVALID_MODE
2356 | NFS_INO_INVALID_OTHER
2357 | NFS_INO_INVALID_BTIME;
2358 if (S_ISDIR(inode->i_mode))
2359 nfs_force_lookup_revalidate(inode);
2360 attr_changed = true;
2361 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2362 inode->i_sb->s_id,
2363 inode->i_ino);
2364 } else if (!have_delegation) {
2365 nfs_ooo_record(nfsi, fattr);
2366 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2367 fattr->change_attr);
2368 }
2369 inode_set_iversion_raw(inode, fattr->change_attr);
2370 }
2371 } else {
2372 nfsi->cache_validity |=
2373 save_cache_validity & NFS_INO_INVALID_CHANGE;
2374 if (!have_delegation ||
2375 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2376 cache_revalidated = false;
2377 }
2378
2379 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2380 inode_set_mtime_to_ts(inode, fattr->mtime);
2381 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2382 nfsi->cache_validity |=
2383 save_cache_validity & NFS_INO_INVALID_MTIME;
2384
2385 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2386 inode_set_ctime_to_ts(inode, fattr->ctime);
2387 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2388 nfsi->cache_validity |=
2389 save_cache_validity & NFS_INO_INVALID_CTIME;
2390
2391 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
2392 nfsi->btime = fattr->btime;
2393 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
2394 nfsi->cache_validity |=
2395 save_cache_validity & NFS_INO_INVALID_BTIME;
2396
2397 /* Check if our cached file size is stale */
2398 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2399 new_isize = nfs_size_to_loff_t(fattr->size);
2400 cur_isize = i_size_read(inode);
2401 if (new_isize != cur_isize && !have_delegation) {
2402 /* Do we perhaps have any outstanding writes, or has
2403 * the file grown beyond our last write? */
2404 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2405 trace_nfs_size_update(inode, new_isize);
2406 i_size_write(inode, new_isize);
2407 if (!have_writers)
2408 invalid |= NFS_INO_INVALID_DATA;
2409 }
2410 }
2411 if (new_isize == 0 &&
2412 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2413 NFS_ATTR_FATTR_BLOCKS_USED))) {
2414 fattr->du.nfs3.used = 0;
2415 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2416 }
2417 } else
2418 nfsi->cache_validity |=
2419 save_cache_validity & NFS_INO_INVALID_SIZE;
2420
2421 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2422 inode_set_atime_to_ts(inode, fattr->atime);
2423 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2424 nfsi->cache_validity |=
2425 save_cache_validity & NFS_INO_INVALID_ATIME;
2426
2427 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2428 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2429 umode_t newmode = inode->i_mode & S_IFMT;
2430 newmode |= fattr->mode & S_IALLUGO;
2431 inode->i_mode = newmode;
2432 invalid |= NFS_INO_INVALID_ACCESS
2433 | NFS_INO_INVALID_ACL;
2434 }
2435 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2436 nfsi->cache_validity |=
2437 save_cache_validity & NFS_INO_INVALID_MODE;
2438
2439 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2440 if (!uid_eq(inode->i_uid, fattr->uid)) {
2441 invalid |= NFS_INO_INVALID_ACCESS
2442 | NFS_INO_INVALID_ACL;
2443 inode->i_uid = fattr->uid;
2444 }
2445 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2446 nfsi->cache_validity |=
2447 save_cache_validity & NFS_INO_INVALID_OTHER;
2448
2449 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2450 if (!gid_eq(inode->i_gid, fattr->gid)) {
2451 invalid |= NFS_INO_INVALID_ACCESS
2452 | NFS_INO_INVALID_ACL;
2453 inode->i_gid = fattr->gid;
2454 }
2455 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2456 nfsi->cache_validity |=
2457 save_cache_validity & NFS_INO_INVALID_OTHER;
2458
2459 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2460 if (inode->i_nlink != fattr->nlink)
2461 set_nlink(inode, fattr->nlink);
2462 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2463 nfsi->cache_validity |=
2464 save_cache_validity & NFS_INO_INVALID_NLINK;
2465
2466 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2467 /*
2468 * report the blocks in 512byte units
2469 */
2470 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2471 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2472 nfsi->cache_validity |=
2473 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2474
2475 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2476 inode->i_blocks = fattr->du.nfs2.blocks;
2477 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2478 nfsi->cache_validity |=
2479 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2480
2481 /* Update attrtimeo value if we're out of the unstable period */
2482 if (attr_changed) {
2483 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2484 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2485 nfsi->attrtimeo_timestamp = now;
2486 /* Set barrier to be more recent than all outstanding updates */
2487 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2488 } else {
2489 if (cache_revalidated) {
2490 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2491 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2492 nfsi->attrtimeo <<= 1;
2493 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2494 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2495 }
2496 nfsi->attrtimeo_timestamp = now;
2497 }
2498 /* Set the barrier to be more recent than this fattr */
2499 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2500 nfsi->attr_gencount = fattr->gencount;
2501 }
2502
2503 /* Don't invalidate the data if we were to blame */
2504 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2505 || S_ISLNK(inode->i_mode)))
2506 invalid &= ~NFS_INO_INVALID_DATA;
2507 nfs_set_cache_invalid(inode, invalid);
2508
2509 return 0;
2510 out_err:
2511 /*
2512 * No need to worry about unhashing the dentry, as the
2513 * lookup validation will know that the inode is bad.
2514 * (But we fall through to invalidate the caches.)
2515 */
2516 nfs_set_inode_stale_locked(inode);
2517 return -ESTALE;
2518 }
2519
nfs_alloc_inode(struct super_block * sb)2520 struct inode *nfs_alloc_inode(struct super_block *sb)
2521 {
2522 struct nfs_inode *nfsi;
2523 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2524 if (!nfsi)
2525 return NULL;
2526 nfsi->flags = 0UL;
2527 nfsi->cache_validity = 0UL;
2528 nfsi->ooo = NULL;
2529 #if IS_ENABLED(CONFIG_NFS_V4)
2530 nfsi->nfs4_acl = NULL;
2531 #endif /* CONFIG_NFS_V4 */
2532 #ifdef CONFIG_NFS_V4_2
2533 nfsi->xattr_cache = NULL;
2534 #endif
2535 nfs_netfs_inode_init(nfsi);
2536
2537 return &nfsi->vfs_inode;
2538 }
2539 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2540
nfs_free_inode(struct inode * inode)2541 void nfs_free_inode(struct inode *inode)
2542 {
2543 kfree(NFS_I(inode)->ooo);
2544 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2545 }
2546 EXPORT_SYMBOL_GPL(nfs_free_inode);
2547
nfs4_init_once(struct nfs_inode * nfsi)2548 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2549 {
2550 #if IS_ENABLED(CONFIG_NFS_V4)
2551 INIT_LIST_HEAD(&nfsi->open_states);
2552 nfsi->delegation = NULL;
2553 init_rwsem(&nfsi->rwsem);
2554 nfsi->layout = NULL;
2555 #endif
2556 }
2557
init_once(void * foo)2558 static void init_once(void *foo)
2559 {
2560 struct nfs_inode *nfsi = foo;
2561
2562 inode_init_once(&nfsi->vfs_inode);
2563 INIT_LIST_HEAD(&nfsi->open_files);
2564 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2565 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2566 nfs4_init_once(nfsi);
2567 }
2568
nfs_init_inodecache(void)2569 static int __init nfs_init_inodecache(void)
2570 {
2571 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2572 sizeof(struct nfs_inode),
2573 0, (SLAB_RECLAIM_ACCOUNT|
2574 SLAB_ACCOUNT),
2575 init_once);
2576 if (nfs_inode_cachep == NULL)
2577 return -ENOMEM;
2578
2579 return 0;
2580 }
2581
nfs_destroy_inodecache(void)2582 static void nfs_destroy_inodecache(void)
2583 {
2584 /*
2585 * Make sure all delayed rcu free inodes are flushed before we
2586 * destroy cache.
2587 */
2588 rcu_barrier();
2589 kmem_cache_destroy(nfs_inode_cachep);
2590 }
2591
2592 struct workqueue_struct *nfslocaliod_workqueue;
2593 struct workqueue_struct *nfsiod_workqueue;
2594 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2595
2596 /*
2597 * Destroy the nfsiod workqueues
2598 */
nfsiod_stop(void)2599 static void nfsiod_stop(void)
2600 {
2601 struct workqueue_struct *wq;
2602
2603 wq = nfsiod_workqueue;
2604 if (wq != NULL) {
2605 nfsiod_workqueue = NULL;
2606 destroy_workqueue(wq);
2607 }
2608 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2609 wq = nfslocaliod_workqueue;
2610 if (wq != NULL) {
2611 nfslocaliod_workqueue = NULL;
2612 destroy_workqueue(wq);
2613 }
2614 #endif /* CONFIG_NFS_LOCALIO */
2615 }
2616
2617 /*
2618 * Start the nfsiod workqueues
2619 */
nfsiod_start(void)2620 static int nfsiod_start(void)
2621 {
2622 dprintk("RPC: creating workqueue nfsiod\n");
2623 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2624 if (nfsiod_workqueue == NULL)
2625 return -ENOMEM;
2626 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2627 /*
2628 * localio writes need to use a normal (non-memreclaim) workqueue.
2629 * When we start getting low on space, XFS goes and calls flush_work() on
2630 * a non-memreclaim work queue, which causes a priority inversion problem.
2631 */
2632 dprintk("RPC: creating workqueue nfslocaliod\n");
2633 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0);
2634 if (unlikely(nfslocaliod_workqueue == NULL)) {
2635 nfsiod_stop();
2636 return -ENOMEM;
2637 }
2638 #endif /* CONFIG_NFS_LOCALIO */
2639 return 0;
2640 }
2641
2642 unsigned int nfs_net_id;
2643 EXPORT_SYMBOL_GPL(nfs_net_id);
2644
nfs_net_init(struct net * net)2645 static int nfs_net_init(struct net *net)
2646 {
2647 struct nfs_net *nn = net_generic(net, nfs_net_id);
2648 int err;
2649
2650 nfs_clients_init(net);
2651
2652 if (!rpc_proc_register(net, &nn->rpcstats)) {
2653 err = -ENOMEM;
2654 goto err_proc_rpc;
2655 }
2656
2657 err = nfs_fs_proc_net_init(net);
2658 if (err)
2659 goto err_proc_nfs;
2660
2661 return 0;
2662
2663 err_proc_nfs:
2664 rpc_proc_unregister(net, "nfs");
2665 err_proc_rpc:
2666 nfs_clients_exit(net);
2667 return err;
2668 }
2669
nfs_net_exit(struct net * net)2670 static void nfs_net_exit(struct net *net)
2671 {
2672 rpc_proc_unregister(net, "nfs");
2673 nfs_fs_proc_net_exit(net);
2674 nfs_clients_exit(net);
2675 }
2676
2677 static struct pernet_operations nfs_net_ops = {
2678 .init = nfs_net_init,
2679 .exit = nfs_net_exit,
2680 .id = &nfs_net_id,
2681 .size = sizeof(struct nfs_net),
2682 };
2683
2684 #ifdef CONFIG_KEYS
2685 static struct key *nfs_keyring;
2686
nfs_init_keyring(void)2687 static int __init nfs_init_keyring(void)
2688 {
2689 nfs_keyring = keyring_alloc(".nfs",
2690 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
2691 current_cred(),
2692 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
2693 (KEY_USR_ALL & ~KEY_USR_SETATTR),
2694 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
2695 return PTR_ERR_OR_ZERO(nfs_keyring);
2696 }
2697
nfs_exit_keyring(void)2698 static void nfs_exit_keyring(void)
2699 {
2700 key_put(nfs_keyring);
2701 }
2702 #else
nfs_init_keyring(void)2703 static inline int nfs_init_keyring(void)
2704 {
2705 return 0;
2706 }
2707
nfs_exit_keyring(void)2708 static inline void nfs_exit_keyring(void)
2709 {
2710 }
2711 #endif /* CONFIG_KEYS */
2712
2713 /*
2714 * Initialize NFS
2715 */
init_nfs_fs(void)2716 static int __init init_nfs_fs(void)
2717 {
2718 int err;
2719
2720 err = nfs_init_keyring();
2721 if (err)
2722 return err;
2723
2724 err = nfs_sysfs_init();
2725 if (err < 0)
2726 goto out10;
2727
2728 err = register_pernet_subsys(&nfs_net_ops);
2729 if (err < 0)
2730 goto out9;
2731
2732 err = nfsiod_start();
2733 if (err)
2734 goto out7;
2735
2736 err = nfs_fs_proc_init();
2737 if (err)
2738 goto out6;
2739
2740 err = nfs_init_nfspagecache();
2741 if (err)
2742 goto out5;
2743
2744 err = nfs_init_inodecache();
2745 if (err)
2746 goto out4;
2747
2748 err = nfs_init_readpagecache();
2749 if (err)
2750 goto out3;
2751
2752 err = nfs_init_writepagecache();
2753 if (err)
2754 goto out2;
2755
2756 err = nfs_init_directcache();
2757 if (err)
2758 goto out1;
2759
2760 err = register_nfs_fs();
2761 if (err)
2762 goto out0;
2763
2764 return 0;
2765 out0:
2766 nfs_destroy_directcache();
2767 out1:
2768 nfs_destroy_writepagecache();
2769 out2:
2770 nfs_destroy_readpagecache();
2771 out3:
2772 nfs_destroy_inodecache();
2773 out4:
2774 nfs_destroy_nfspagecache();
2775 out5:
2776 nfs_fs_proc_exit();
2777 out6:
2778 nfsiod_stop();
2779 out7:
2780 unregister_pernet_subsys(&nfs_net_ops);
2781 out9:
2782 nfs_sysfs_exit();
2783 out10:
2784 nfs_exit_keyring();
2785 return err;
2786 }
2787
exit_nfs_fs(void)2788 static void __exit exit_nfs_fs(void)
2789 {
2790 nfs_destroy_directcache();
2791 nfs_destroy_writepagecache();
2792 nfs_destroy_readpagecache();
2793 nfs_destroy_inodecache();
2794 nfs_destroy_nfspagecache();
2795 unregister_pernet_subsys(&nfs_net_ops);
2796 unregister_nfs_fs();
2797 nfs_fs_proc_exit();
2798 nfsiod_stop();
2799 nfs_sysfs_exit();
2800 nfs_exit_keyring();
2801 }
2802
2803 /* Not quite true; I just maintain it */
2804 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2805 MODULE_DESCRIPTION("NFS client support");
2806 MODULE_LICENSE("GPL");
2807 module_param(enable_ino64, bool, 0644);
2808
2809 module_init(init_nfs_fs)
2810 module_exit(exit_nfs_fs)
2811