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