1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 */
16
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/sched/signal.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/stat.h>
25 #include <linux/errno.h>
26 #include <linux/unistd.h>
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/stats.h>
29 #include <linux/sunrpc/metrics.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_mount.h>
32 #include <linux/nfs4_mount.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
42 #include <linux/uaccess.h>
43 #include <linux/iversion.h>
44
45 #include "nfs4_fs.h"
46 #include "callback.h"
47 #include "delegation.h"
48 #include "iostat.h"
49 #include "internal.h"
50 #include "fscache.h"
51 #include "pnfs.h"
52 #include "nfs.h"
53 #include "netns.h"
54 #include "sysfs.h"
55
56 #include "nfstrace.h"
57
58 #define NFSDBG_FACILITY NFSDBG_VFS
59
60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62 /* Default is to see 64-bit inode numbers */
63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67 static struct kmem_cache * nfs_inode_cachep;
68
69 static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr * fattr)70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 {
72 return nfs_fileid_to_ino_t(fattr->fileid);
73 }
74
nfs_wait_bit_killable(struct wait_bit_key * key,int mode)75 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
76 {
77 if (unlikely(nfs_current_task_exiting()))
78 return -EINTR;
79 schedule();
80 if (signal_pending_state(mode, current))
81 return -ERESTARTSYS;
82 return 0;
83 }
84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
85
86 /**
87 * nfs_compat_user_ino64 - returns the user-visible inode number
88 * @fileid: 64-bit fileid
89 *
90 * This function returns a 32-bit inode number if the boot parameter
91 * nfs.enable_ino64 is zero.
92 */
nfs_compat_user_ino64(u64 fileid)93 u64 nfs_compat_user_ino64(u64 fileid)
94 {
95 #ifdef CONFIG_COMPAT
96 compat_ulong_t ino;
97 #else
98 unsigned long ino;
99 #endif
100
101 if (enable_ino64)
102 return fileid;
103 ino = fileid;
104 if (sizeof(ino) < sizeof(fileid))
105 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
106 return ino;
107 }
108
nfs_drop_inode(struct inode * inode)109 int nfs_drop_inode(struct inode *inode)
110 {
111 return NFS_STALE(inode) || inode_generic_drop(inode);
112 }
113 EXPORT_SYMBOL_GPL(nfs_drop_inode);
114
nfs_clear_inode(struct inode * inode)115 void nfs_clear_inode(struct inode *inode)
116 {
117 /*
118 * The following should never happen...
119 */
120 WARN_ON_ONCE(nfs_have_writebacks(inode));
121 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
122 nfs_zap_acl_cache(inode);
123 nfs_access_zap_cache(inode);
124 nfs_fscache_clear_inode(inode);
125 }
126 EXPORT_SYMBOL_GPL(nfs_clear_inode);
127
nfs_evict_inode(struct inode * inode)128 void nfs_evict_inode(struct inode *inode)
129 {
130 truncate_inode_pages_final(&inode->i_data);
131 clear_inode(inode);
132 nfs_clear_inode(inode);
133 }
134
nfs_sync_inode(struct inode * inode)135 int nfs_sync_inode(struct inode *inode)
136 {
137 inode_dio_wait(inode);
138 return nfs_wb_all(inode);
139 }
140 EXPORT_SYMBOL_GPL(nfs_sync_inode);
141
142 /**
143 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
144 * @mapping: pointer to struct address_space
145 */
nfs_sync_mapping(struct address_space * mapping)146 int nfs_sync_mapping(struct address_space *mapping)
147 {
148 int ret = 0;
149
150 if (mapping->nrpages != 0) {
151 unmap_mapping_range(mapping, 0, 0, 0);
152 ret = nfs_wb_all(mapping->host);
153 }
154 return ret;
155 }
156
nfs_attribute_timeout(struct inode * inode)157 static int nfs_attribute_timeout(struct inode *inode)
158 {
159 struct nfs_inode *nfsi = NFS_I(inode);
160
161 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
162 }
163
nfs_check_cache_flags_invalid(struct inode * inode,unsigned long flags)164 static bool nfs_check_cache_flags_invalid(struct inode *inode,
165 unsigned long flags)
166 {
167 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
168
169 return (cache_validity & flags) != 0;
170 }
171
nfs_check_cache_invalid(struct inode * inode,unsigned long flags)172 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
173 {
174 if (nfs_check_cache_flags_invalid(inode, flags))
175 return true;
176 return nfs_attribute_cache_expired(inode);
177 }
178 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
179
180 #ifdef CONFIG_NFS_V4_2
nfs_has_xattr_cache(const struct nfs_inode * nfsi)181 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
182 {
183 return nfsi->xattr_cache != NULL;
184 }
185 #else
nfs_has_xattr_cache(const struct nfs_inode * nfsi)186 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
187 {
188 return false;
189 }
190 #endif
191
nfs_set_cache_invalid(struct inode * inode,unsigned long flags)192 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
193 {
194 struct nfs_inode *nfsi = NFS_I(inode);
195
196 if (nfs_have_delegated_attributes(inode)) {
197 if (!(flags & NFS_INO_REVAL_FORCED))
198 flags &= ~(NFS_INO_INVALID_MODE |
199 NFS_INO_INVALID_OTHER |
200 NFS_INO_INVALID_BTIME |
201 NFS_INO_INVALID_XATTR);
202 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
203 }
204
205 if (!nfs_has_xattr_cache(nfsi))
206 flags &= ~NFS_INO_INVALID_XATTR;
207 if (flags & NFS_INO_INVALID_DATA)
208 nfs_fscache_invalidate(inode, 0);
209 flags &= ~NFS_INO_REVAL_FORCED;
210
211 flags |= nfsi->cache_validity;
212 if (inode->i_mapping->nrpages == 0)
213 flags &= ~NFS_INO_INVALID_DATA;
214
215 /* pairs with nfs_clear_invalid_mapping()'s smp_load_acquire() */
216 smp_store_release(&nfsi->cache_validity, flags);
217
218 if (inode->i_mapping->nrpages == 0 ||
219 nfsi->cache_validity & NFS_INO_INVALID_DATA) {
220 nfs_ooo_clear(nfsi);
221 }
222 trace_nfs_set_cache_invalid(inode, 0);
223 }
224 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
225
226 /*
227 * Invalidate the local caches
228 */
nfs_zap_caches_locked(struct inode * inode)229 static void nfs_zap_caches_locked(struct inode *inode)
230 {
231 struct nfs_inode *nfsi = NFS_I(inode);
232 int mode = inode->i_mode;
233
234 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
235
236 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
237 nfsi->attrtimeo_timestamp = jiffies;
238
239 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
240 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
241 NFS_INO_INVALID_DATA |
242 NFS_INO_INVALID_ACCESS |
243 NFS_INO_INVALID_ACL |
244 NFS_INO_INVALID_XATTR);
245 else
246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
247 NFS_INO_INVALID_ACCESS |
248 NFS_INO_INVALID_ACL |
249 NFS_INO_INVALID_XATTR);
250 nfs_zap_label_cache_locked(nfsi);
251 }
252
nfs_zap_caches(struct inode * inode)253 void nfs_zap_caches(struct inode *inode)
254 {
255 spin_lock(&inode->i_lock);
256 nfs_zap_caches_locked(inode);
257 spin_unlock(&inode->i_lock);
258 }
259
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)260 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
261 {
262 if (mapping->nrpages != 0) {
263 spin_lock(&inode->i_lock);
264 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
265 spin_unlock(&inode->i_lock);
266 }
267 }
268
nfs_zap_acl_cache(struct inode * inode)269 void nfs_zap_acl_cache(struct inode *inode)
270 {
271 void (*clear_acl_cache)(struct inode *);
272
273 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
274 if (clear_acl_cache != NULL)
275 clear_acl_cache(inode);
276 spin_lock(&inode->i_lock);
277 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
278 spin_unlock(&inode->i_lock);
279 }
280 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
281
nfs_invalidate_atime(struct inode * inode)282 void nfs_invalidate_atime(struct inode *inode)
283 {
284 if (nfs_have_delegated_atime(inode))
285 return;
286 spin_lock(&inode->i_lock);
287 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
288 spin_unlock(&inode->i_lock);
289 }
290 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
291
292 /*
293 * Invalidate, but do not unhash, the inode.
294 * NB: must be called with inode->i_lock held!
295 */
nfs_set_inode_stale_locked(struct inode * inode)296 static void nfs_set_inode_stale_locked(struct inode *inode)
297 {
298 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
299 nfs_zap_caches_locked(inode);
300 trace_nfs_set_inode_stale(inode);
301 }
302
nfs_set_inode_stale(struct inode * inode)303 void nfs_set_inode_stale(struct inode *inode)
304 {
305 spin_lock(&inode->i_lock);
306 nfs_set_inode_stale_locked(inode);
307 spin_unlock(&inode->i_lock);
308 }
309
310 struct nfs_find_desc {
311 struct nfs_fh *fh;
312 struct nfs_fattr *fattr;
313 };
314
315 /*
316 * In NFSv3 we can have 64bit inode numbers. In order to support
317 * this, and re-exported directories (also seen in NFSv2)
318 * we are forced to allow 2 different inodes to have the same
319 * i_ino.
320 */
321 static int
nfs_find_actor(struct inode * inode,void * opaque)322 nfs_find_actor(struct inode *inode, void *opaque)
323 {
324 struct nfs_find_desc *desc = opaque;
325 struct nfs_fh *fh = desc->fh;
326 struct nfs_fattr *fattr = desc->fattr;
327
328 if (NFS_FILEID(inode) != fattr->fileid)
329 return 0;
330 if (inode_wrong_type(inode, fattr->mode))
331 return 0;
332 if (nfs_compare_fh(NFS_FH(inode), fh))
333 return 0;
334 if (is_bad_inode(inode) || NFS_STALE(inode))
335 return 0;
336 return 1;
337 }
338
339 static int
nfs_init_locked(struct inode * inode,void * opaque)340 nfs_init_locked(struct inode *inode, void *opaque)
341 {
342 struct nfs_find_desc *desc = opaque;
343 struct nfs_fattr *fattr = desc->fattr;
344
345 set_nfs_fileid(inode, fattr->fileid);
346 inode->i_mode = fattr->mode;
347 nfs_copy_fh(NFS_FH(inode), desc->fh);
348 return 0;
349 }
350
351 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)352 static void nfs_clear_label_invalid(struct inode *inode)
353 {
354 spin_lock(&inode->i_lock);
355 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
356 spin_unlock(&inode->i_lock);
357 }
358
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)359 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
360 {
361 int error;
362
363 if (fattr->label == NULL)
364 return;
365
366 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
367 error = security_inode_notifysecctx(inode, fattr->label->label,
368 fattr->label->len);
369 if (error)
370 printk(KERN_ERR "%s() %s %d "
371 "security_inode_notifysecctx() %d\n",
372 __func__,
373 (char *)fattr->label->label,
374 fattr->label->len, error);
375 nfs_clear_label_invalid(inode);
376 }
377 }
378
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)379 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
380 {
381 struct nfs4_label *label;
382
383 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
384 return NULL;
385
386 label = kzalloc(sizeof(struct nfs4_label), flags);
387 if (label == NULL)
388 return ERR_PTR(-ENOMEM);
389
390 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
391 if (label->label == NULL) {
392 kfree(label);
393 return ERR_PTR(-ENOMEM);
394 }
395 label->len = NFS4_MAXLABELLEN;
396
397 return label;
398 }
399 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
400 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)401 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
402 {
403 }
404 #endif
405 EXPORT_SYMBOL_GPL(nfs_setsecurity);
406
407 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
408 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)409 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
410 {
411 struct nfs_find_desc desc = {
412 .fh = fh,
413 .fattr = fattr,
414 };
415 struct inode *inode;
416 unsigned long hash;
417
418 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
419 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
420 return NULL;
421
422 hash = nfs_fattr_to_ino_t(fattr);
423 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
424
425 dprintk("%s: returning %p\n", __func__, inode);
426 return inode;
427 }
428
nfs_inode_init_regular(struct nfs_inode * nfsi)429 static void nfs_inode_init_regular(struct nfs_inode *nfsi)
430 {
431 atomic_long_set(&nfsi->nrequests, 0);
432 atomic_long_set(&nfsi->redirtied_pages, 0);
433 INIT_LIST_HEAD(&nfsi->commit_info.list);
434 atomic_long_set(&nfsi->commit_info.ncommit, 0);
435 atomic_set(&nfsi->commit_info.rpcs_out, 0);
436 mutex_init(&nfsi->commit_mutex);
437 }
438
nfs_inode_init_dir(struct nfs_inode * nfsi)439 static void nfs_inode_init_dir(struct nfs_inode *nfsi)
440 {
441 nfsi->cache_change_attribute = 0;
442 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
443 init_rwsem(&nfsi->rmdir_sem);
444 }
445
446 /*
447 * This is our front-end to iget that looks up inodes by file handle
448 * instead of inode number.
449 */
450 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr)451 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
452 {
453 struct nfs_find_desc desc = {
454 .fh = fh,
455 .fattr = fattr
456 };
457 struct inode *inode = ERR_PTR(-ENOENT);
458 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
459 unsigned long hash;
460
461 nfs_attr_check_mountpoint(sb, fattr);
462
463 if (nfs_attr_use_mounted_on_fileid(fattr))
464 fattr->fileid = fattr->mounted_on_fileid;
465 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
466 goto out_no_inode;
467 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
468 goto out_no_inode;
469
470 hash = nfs_fattr_to_ino_t(fattr);
471
472 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
473 if (inode == NULL) {
474 inode = ERR_PTR(-ENOMEM);
475 goto out_no_inode;
476 }
477
478 if (inode->i_state & I_NEW) {
479 struct nfs_inode *nfsi = NFS_I(inode);
480 unsigned long now = jiffies;
481
482 /* We set i_ino for the few things that still rely on it,
483 * such as stat(2) */
484 inode->i_ino = hash;
485
486 /* We can't support update_atime(), since the server will reset it */
487 inode->i_flags |= S_NOATIME|S_NOCMTIME;
488 inode->i_mode = fattr->mode;
489 nfsi->cache_validity = 0;
490 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
491 && (fattr_supported & NFS_ATTR_FATTR_MODE))
492 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
493 /* Why so? Because we want revalidate for devices/FIFOs, and
494 * that's precisely what we have in nfs_file_inode_operations.
495 */
496 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
497 if (S_ISREG(inode->i_mode)) {
498 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
499 inode->i_data.a_ops = &nfs_file_aops;
500 nfs_inode_init_regular(nfsi);
501 mapping_set_large_folios(inode->i_mapping);
502 } else if (S_ISDIR(inode->i_mode)) {
503 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
504 inode->i_fop = &nfs_dir_operations;
505 inode->i_data.a_ops = &nfs_dir_aops;
506 nfs_inode_init_dir(nfsi);
507 /* Deal with crossing mountpoints */
508 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
509 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
510 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
511 inode->i_op = &nfs_referral_inode_operations;
512 else
513 inode->i_op = &nfs_mountpoint_inode_operations;
514 inode->i_fop = NULL;
515 inode->i_flags |= S_AUTOMOUNT;
516 }
517 } else if (S_ISLNK(inode->i_mode)) {
518 inode->i_op = &nfs_symlink_inode_operations;
519 inode_nohighmem(inode);
520 } else
521 init_special_inode(inode, inode->i_mode, fattr->rdev);
522
523 inode_set_atime(inode, 0, 0);
524 inode_set_mtime(inode, 0, 0);
525 inode_set_ctime(inode, 0, 0);
526 memset(&nfsi->btime, 0, sizeof(nfsi->btime));
527 inode_set_iversion_raw(inode, 0);
528 inode->i_size = 0;
529 clear_nlink(inode);
530 inode->i_uid = make_kuid(&init_user_ns, -2);
531 inode->i_gid = make_kgid(&init_user_ns, -2);
532 inode->i_blocks = 0;
533 nfsi->write_io = 0;
534 nfsi->read_io = 0;
535
536 nfsi->read_cache_jiffies = fattr->time_start;
537 nfsi->attr_gencount = fattr->gencount;
538 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
539 inode_set_atime_to_ts(inode, fattr->atime);
540 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
542 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
543 inode_set_mtime_to_ts(inode, fattr->mtime);
544 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
546 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
547 inode_set_ctime_to_ts(inode, fattr->ctime);
548 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
550 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
551 nfsi->btime = fattr->btime;
552 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
553 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BTIME);
554 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
555 inode_set_iversion_raw(inode, fattr->change_attr);
556 else
557 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
558 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
559 inode->i_size = nfs_size_to_loff_t(fattr->size);
560 else
561 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
562 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
563 set_nlink(inode, fattr->nlink);
564 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
565 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
566 else
567 set_nlink(inode, 1);
568 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
569 inode->i_uid = fattr->uid;
570 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
571 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
572 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
573 inode->i_gid = fattr->gid;
574 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
575 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
576 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
577 inode->i_blocks = fattr->du.nfs2.blocks;
578 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
579 fattr->size != 0)
580 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
581 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
582 /*
583 * report the blocks in 512byte units
584 */
585 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
586 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
587 fattr->size != 0)
588 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
589
590 nfs_setsecurity(inode, fattr);
591
592 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
593 nfsi->attrtimeo_timestamp = now;
594 nfsi->access_cache = RB_ROOT;
595
596 nfs_fscache_init_inode(inode);
597
598 unlock_new_inode(inode);
599 } else {
600 int err = nfs_refresh_inode(inode, fattr);
601 if (err < 0) {
602 iput(inode);
603 inode = ERR_PTR(err);
604 goto out_no_inode;
605 }
606 }
607 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
608 inode->i_sb->s_id,
609 (unsigned long long)NFS_FILEID(inode),
610 nfs_display_fhandle_hash(fh),
611 icount_read(inode));
612
613 out:
614 return inode;
615
616 out_no_inode:
617 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
618 goto out;
619 }
620 EXPORT_SYMBOL_GPL(nfs_fhget);
621
622 static void
nfs_fattr_fixup_delegated(struct inode * inode,struct nfs_fattr * fattr)623 nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr)
624 {
625 unsigned long cache_validity = NFS_I(inode)->cache_validity;
626
627 if (nfs_have_delegated_mtime(inode)) {
628 if (!(cache_validity & NFS_INO_INVALID_CTIME))
629 fattr->valid &= ~(NFS_ATTR_FATTR_PRECTIME |
630 NFS_ATTR_FATTR_CTIME);
631
632 if (!(cache_validity & NFS_INO_INVALID_MTIME))
633 fattr->valid &= ~(NFS_ATTR_FATTR_PREMTIME |
634 NFS_ATTR_FATTR_MTIME);
635
636 if (!(cache_validity & NFS_INO_INVALID_ATIME))
637 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
638 } else if (nfs_have_delegated_atime(inode)) {
639 if (!(cache_validity & NFS_INO_INVALID_ATIME))
640 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
641 }
642 }
643
nfs_set_timestamps_to_ts(struct inode * inode,struct iattr * attr)644 static void nfs_set_timestamps_to_ts(struct inode *inode, struct iattr *attr)
645 {
646 unsigned int cache_flags = 0;
647
648 if (attr->ia_valid & ATTR_MTIME_SET) {
649 struct timespec64 ctime = inode_get_ctime(inode);
650 struct timespec64 mtime = inode_get_mtime(inode);
651 struct timespec64 now;
652 int updated = 0;
653
654 now = inode_set_ctime_current(inode);
655 if (!timespec64_equal(&now, &ctime))
656 updated |= S_CTIME;
657
658 inode_set_mtime_to_ts(inode, attr->ia_mtime);
659 if (!timespec64_equal(&now, &mtime))
660 updated |= S_MTIME;
661
662 inode_maybe_inc_iversion(inode, updated);
663 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
664 }
665 if (attr->ia_valid & ATTR_ATIME_SET) {
666 inode_set_atime_to_ts(inode, attr->ia_atime);
667 cache_flags |= NFS_INO_INVALID_ATIME;
668 }
669 NFS_I(inode)->cache_validity &= ~cache_flags;
670 }
671
nfs_update_timestamps(struct inode * inode,unsigned int ia_valid)672 static void nfs_update_timestamps(struct inode *inode, unsigned int ia_valid)
673 {
674 enum file_time_flags time_flags = 0;
675 unsigned int cache_flags = 0;
676
677 if (ia_valid & ATTR_MTIME) {
678 time_flags |= S_MTIME | S_CTIME;
679 cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
680 }
681 if (ia_valid & ATTR_ATIME) {
682 time_flags |= S_ATIME;
683 cache_flags |= NFS_INO_INVALID_ATIME;
684 }
685 inode_update_timestamps(inode, time_flags);
686 NFS_I(inode)->cache_validity &= ~cache_flags;
687 }
688
nfs_update_delegated_atime(struct inode * inode)689 void nfs_update_delegated_atime(struct inode *inode)
690 {
691 spin_lock(&inode->i_lock);
692 if (nfs_have_delegated_atime(inode))
693 nfs_update_timestamps(inode, ATTR_ATIME);
694 spin_unlock(&inode->i_lock);
695 }
696
nfs_update_delegated_mtime_locked(struct inode * inode)697 void nfs_update_delegated_mtime_locked(struct inode *inode)
698 {
699 if (nfs_have_delegated_mtime(inode))
700 nfs_update_timestamps(inode, ATTR_MTIME);
701 }
702
nfs_update_delegated_mtime(struct inode * inode)703 void nfs_update_delegated_mtime(struct inode *inode)
704 {
705 spin_lock(&inode->i_lock);
706 nfs_update_delegated_mtime_locked(inode);
707 spin_unlock(&inode->i_lock);
708 }
709 EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime);
710
711 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
712
713 int
nfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)714 nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
715 struct iattr *attr)
716 {
717 struct inode *inode = d_inode(dentry);
718 struct nfs_fattr *fattr;
719 loff_t oldsize = i_size_read(inode);
720 int error = 0;
721
722 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
723
724 /* skip mode change if it's just for clearing setuid/setgid */
725 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
726 attr->ia_valid &= ~ATTR_MODE;
727
728 if (attr->ia_valid & ATTR_SIZE) {
729 BUG_ON(!S_ISREG(inode->i_mode));
730
731 error = inode_newsize_ok(inode, attr->ia_size);
732 if (error)
733 return error;
734
735 if (attr->ia_size == oldsize)
736 attr->ia_valid &= ~ATTR_SIZE;
737 }
738
739 if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
740 spin_lock(&inode->i_lock);
741 if (attr->ia_valid & ATTR_MTIME_SET) {
742 nfs_set_timestamps_to_ts(inode, attr);
743 attr->ia_valid &= ~(ATTR_MTIME|ATTR_MTIME_SET|
744 ATTR_ATIME|ATTR_ATIME_SET);
745 } else {
746 nfs_update_timestamps(inode, attr->ia_valid);
747 attr->ia_valid &= ~(ATTR_MTIME|ATTR_ATIME);
748 }
749 spin_unlock(&inode->i_lock);
750 } else if (nfs_have_delegated_atime(inode) &&
751 attr->ia_valid & ATTR_ATIME &&
752 !(attr->ia_valid & ATTR_MTIME)) {
753 if (attr->ia_valid & ATTR_ATIME_SET) {
754 spin_lock(&inode->i_lock);
755 nfs_set_timestamps_to_ts(inode, attr);
756 spin_unlock(&inode->i_lock);
757 attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
758 } else {
759 nfs_update_delegated_atime(inode);
760 attr->ia_valid &= ~ATTR_ATIME;
761 }
762 }
763
764 /* Optimization: if the end result is no change, don't RPC */
765 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
766 return 0;
767
768 trace_nfs_setattr_enter(inode);
769
770 /* Write all dirty data */
771 if (S_ISREG(inode->i_mode)) {
772 nfs_file_block_o_direct(NFS_I(inode));
773 nfs_sync_inode(inode);
774 }
775
776 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
777 if (fattr == NULL) {
778 error = -ENOMEM;
779 goto out;
780 }
781
782 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
783 if (error == 0) {
784 if (attr->ia_valid & ATTR_SIZE)
785 nfs_truncate_last_folio(inode->i_mapping, oldsize,
786 attr->ia_size);
787 error = nfs_refresh_inode(inode, fattr);
788 }
789 nfs_free_fattr(fattr);
790 out:
791 trace_nfs_setattr_exit(inode, error);
792 return error;
793 }
794 EXPORT_SYMBOL_GPL(nfs_setattr);
795
796 /**
797 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
798 * @inode: inode of the file used
799 * @offset: file offset to start truncating
800 *
801 * This is a copy of the common vmtruncate, but with the locking
802 * corrected to take into account the fact that NFS requires
803 * inode->i_size to be updated under the inode->i_lock.
804 * Note: must be called with inode->i_lock held!
805 */
nfs_vmtruncate(struct inode * inode,loff_t offset)806 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
807 {
808 int err;
809
810 err = inode_newsize_ok(inode, offset);
811 if (err)
812 goto out;
813
814 trace_nfs_size_truncate(inode, offset);
815 i_size_write(inode, offset);
816 /* Optimisation */
817 if (offset == 0) {
818 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
819 nfs_ooo_clear(NFS_I(inode));
820 }
821 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
822
823 spin_unlock(&inode->i_lock);
824 truncate_pagecache(inode, offset);
825 nfs_update_delegated_mtime_locked(inode);
826 spin_lock(&inode->i_lock);
827 out:
828 return err;
829 }
830
831 /**
832 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
833 * @inode: pointer to struct inode
834 * @attr: pointer to struct iattr
835 * @fattr: pointer to struct nfs_fattr
836 *
837 * Note: we do this in the *proc.c in order to ensure that
838 * it works for things like exclusive creates too.
839 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)840 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
841 struct nfs_fattr *fattr)
842 {
843 /* Barrier: bump the attribute generation count. */
844 nfs_fattr_set_barrier(fattr);
845
846 spin_lock(&inode->i_lock);
847 NFS_I(inode)->attr_gencount = fattr->gencount;
848 if ((attr->ia_valid & ATTR_SIZE) != 0) {
849 if (!nfs_have_delegated_mtime(inode))
850 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
851 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
852 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
853 nfs_vmtruncate(inode, attr->ia_size);
854 }
855 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
856 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
857 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
858 inode->i_mode & S_ISUID)
859 inode->i_mode &= ~S_ISUID;
860 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
861 inode->i_mode &= ~S_ISGID;
862 if ((attr->ia_valid & ATTR_MODE) != 0) {
863 int mode = attr->ia_mode & S_IALLUGO;
864 mode |= inode->i_mode & ~S_IALLUGO;
865 inode->i_mode = mode;
866 }
867 if ((attr->ia_valid & ATTR_UID) != 0)
868 inode->i_uid = attr->ia_uid;
869 if ((attr->ia_valid & ATTR_GID) != 0)
870 inode->i_gid = attr->ia_gid;
871 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
872 inode_set_ctime_to_ts(inode, fattr->ctime);
873 else
874 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
875 | NFS_INO_INVALID_CTIME);
876 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
877 | NFS_INO_INVALID_ACL);
878 }
879 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
880 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
881 | NFS_INO_INVALID_CTIME);
882 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
883 inode_set_atime_to_ts(inode, fattr->atime);
884 else if (attr->ia_valid & ATTR_ATIME_SET)
885 inode_set_atime_to_ts(inode, attr->ia_atime);
886 else
887 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
888
889 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
890 inode_set_ctime_to_ts(inode, fattr->ctime);
891 else
892 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
893 | NFS_INO_INVALID_CTIME);
894 }
895 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
896 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
897 | NFS_INO_INVALID_CTIME);
898 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
899 inode_set_mtime_to_ts(inode, fattr->mtime);
900 else if (attr->ia_valid & ATTR_MTIME_SET)
901 inode_set_mtime_to_ts(inode, attr->ia_mtime);
902 else
903 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
904
905 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
906 inode_set_ctime_to_ts(inode, fattr->ctime);
907 else
908 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
909 | NFS_INO_INVALID_CTIME);
910 }
911 if (fattr->valid)
912 nfs_update_inode(inode, fattr);
913 spin_unlock(&inode->i_lock);
914 }
915 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
916
917 /*
918 * Don't request help from readdirplus if the file is being written to,
919 * or if attribute caching is turned off
920 */
nfs_getattr_readdirplus_enable(const struct inode * inode)921 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
922 {
923 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
924 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
925 }
926
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)927 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
928 {
929 if (!IS_ROOT(dentry)) {
930 struct dentry *parent = dget_parent(dentry);
931 nfs_readdir_record_entry_cache_miss(d_inode(parent));
932 dput(parent);
933 }
934 }
935
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)936 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
937 {
938 if (!IS_ROOT(dentry)) {
939 struct dentry *parent = dget_parent(dentry);
940 nfs_readdir_record_entry_cache_hit(d_inode(parent));
941 dput(parent);
942 }
943 }
944
nfs_get_valid_attrmask(struct inode * inode)945 static u32 nfs_get_valid_attrmask(struct inode *inode)
946 {
947 u64 fattr_valid = NFS_SERVER(inode)->fattr_valid;
948 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
949 u32 reply_mask = STATX_INO | STATX_TYPE;
950
951 if (!(cache_validity & NFS_INO_INVALID_ATIME))
952 reply_mask |= STATX_ATIME;
953 if (!(cache_validity & NFS_INO_INVALID_CTIME))
954 reply_mask |= STATX_CTIME;
955 if (!(cache_validity & NFS_INO_INVALID_MTIME))
956 reply_mask |= STATX_MTIME;
957 if (!(cache_validity & NFS_INO_INVALID_SIZE))
958 reply_mask |= STATX_SIZE;
959 if (!(cache_validity & NFS_INO_INVALID_NLINK))
960 reply_mask |= STATX_NLINK;
961 if (!(cache_validity & NFS_INO_INVALID_MODE))
962 reply_mask |= STATX_MODE;
963 if (!(cache_validity & NFS_INO_INVALID_OTHER))
964 reply_mask |= STATX_UID | STATX_GID;
965 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
966 reply_mask |= STATX_BLOCKS;
967 if (!(cache_validity & NFS_INO_INVALID_BTIME) &&
968 (fattr_valid & NFS_ATTR_FATTR_BTIME))
969 reply_mask |= STATX_BTIME;
970 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
971 reply_mask |= STATX_CHANGE_COOKIE;
972 return reply_mask;
973 }
974
nfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)975 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
976 struct kstat *stat, u32 request_mask, unsigned int query_flags)
977 {
978 struct inode *inode = d_inode(path->dentry);
979 struct nfs_server *server = NFS_SERVER(inode);
980 u64 fattr_valid = server->fattr_valid;
981 unsigned long cache_validity;
982 int err = 0;
983 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
984 bool do_update = false;
985 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
986
987 trace_nfs_getattr_enter(inode);
988
989 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
990 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
991 STATX_INO | STATX_SIZE | STATX_BLOCKS | STATX_BTIME |
992 STATX_CHANGE_COOKIE;
993
994 if (!(fattr_valid & NFS_ATTR_FATTR_BTIME))
995 request_mask &= ~STATX_BTIME;
996
997 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
998 if (readdirplus_enabled)
999 nfs_readdirplus_parent_cache_hit(path->dentry);
1000 goto out_no_revalidate;
1001 }
1002
1003 /* Flush out writes to the server in order to update c/mtime/version. */
1004 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
1005 S_ISREG(inode->i_mode)) {
1006 if (nfs_have_delegated_mtime(inode))
1007 filemap_fdatawrite(inode->i_mapping);
1008 else
1009 filemap_write_and_wait(inode->i_mapping);
1010 }
1011
1012 /*
1013 * We may force a getattr if the user cares about atime.
1014 *
1015 * Note that we only have to check the vfsmount flags here:
1016 * - NFS always sets S_NOATIME by so checking it would give a
1017 * bogus result
1018 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
1019 * no point in checking those.
1020 */
1021 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
1022 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1023 request_mask &= ~STATX_ATIME;
1024
1025 /* Is the user requesting attributes that might need revalidation? */
1026 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
1027 STATX_MTIME|STATX_UID|STATX_GID|
1028 STATX_SIZE|STATX_BLOCKS|STATX_BTIME|
1029 STATX_CHANGE_COOKIE)))
1030 goto out_no_revalidate;
1031
1032 /* Check whether the cached attributes are stale */
1033 do_update |= force_sync || nfs_attribute_cache_expired(inode);
1034 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
1035 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
1036 if (request_mask & STATX_ATIME)
1037 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
1038 if (request_mask & STATX_CTIME)
1039 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
1040 if (request_mask & STATX_MTIME)
1041 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
1042 if (request_mask & STATX_SIZE)
1043 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
1044 if (request_mask & STATX_NLINK)
1045 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
1046 if (request_mask & STATX_MODE)
1047 do_update |= cache_validity & NFS_INO_INVALID_MODE;
1048 if (request_mask & (STATX_UID | STATX_GID))
1049 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
1050 if (request_mask & STATX_BLOCKS)
1051 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
1052 if (request_mask & STATX_BTIME)
1053 do_update |= cache_validity & NFS_INO_INVALID_BTIME;
1054
1055 if (do_update) {
1056 if (readdirplus_enabled)
1057 nfs_readdirplus_parent_cache_miss(path->dentry);
1058 err = __nfs_revalidate_inode(server, inode);
1059 if (err)
1060 goto out;
1061 } else if (readdirplus_enabled)
1062 nfs_readdirplus_parent_cache_hit(path->dentry);
1063 out_no_revalidate:
1064 /* Only return attributes that were revalidated. */
1065 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
1066
1067 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
1068 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
1069 stat->change_cookie = inode_peek_iversion_raw(inode);
1070 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
1071 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
1072 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
1073 if (S_ISDIR(inode->i_mode))
1074 stat->blksize = NFS_SERVER(inode)->dtsize;
1075 stat->btime = NFS_I(inode)->btime;
1076
1077 /* Special handling for STATX_DIOALIGN and STATX_DIO_READ_ALIGN
1078 * - NFS doesn't have DIO alignment constraints, avoid getting
1079 * these DIO attrs from remote and just respond with most
1080 * accommodating limits (so client will issue supported DIO).
1081 * - this is unintuitive, but the most coarse-grained
1082 * dio_offset_align is the most accommodating.
1083 */
1084 if ((request_mask & (STATX_DIOALIGN | STATX_DIO_READ_ALIGN)) &&
1085 S_ISREG(inode->i_mode)) {
1086 stat->result_mask |= STATX_DIOALIGN | STATX_DIO_READ_ALIGN;
1087 stat->dio_mem_align = 4; /* 4-byte alignment */
1088 stat->dio_offset_align = PAGE_SIZE;
1089 stat->dio_read_offset_align = stat->dio_offset_align;
1090 }
1091 out:
1092 trace_nfs_getattr_exit(inode, err);
1093 return err;
1094 }
1095 EXPORT_SYMBOL_GPL(nfs_getattr);
1096
nfs_init_lock_context(struct nfs_lock_context * l_ctx)1097 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
1098 {
1099 refcount_set(&l_ctx->count, 1);
1100 l_ctx->lockowner = current->files;
1101 INIT_LIST_HEAD(&l_ctx->list);
1102 atomic_set(&l_ctx->io_count, 0);
1103 }
1104
__nfs_find_lock_context(struct nfs_open_context * ctx)1105 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
1106 {
1107 struct nfs_lock_context *pos;
1108
1109 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
1110 if (pos->lockowner != current->files)
1111 continue;
1112 if (refcount_inc_not_zero(&pos->count))
1113 return pos;
1114 }
1115 return NULL;
1116 }
1117
nfs_get_lock_context(struct nfs_open_context * ctx)1118 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
1119 {
1120 struct nfs_lock_context *res, *new = NULL;
1121 struct inode *inode = d_inode(ctx->dentry);
1122
1123 rcu_read_lock();
1124 res = __nfs_find_lock_context(ctx);
1125 rcu_read_unlock();
1126 if (res == NULL) {
1127 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
1128 if (new == NULL)
1129 return ERR_PTR(-ENOMEM);
1130 nfs_init_lock_context(new);
1131 spin_lock(&inode->i_lock);
1132 res = __nfs_find_lock_context(ctx);
1133 if (res == NULL) {
1134 new->open_context = get_nfs_open_context(ctx);
1135 if (new->open_context) {
1136 list_add_tail_rcu(&new->list,
1137 &ctx->lock_context.list);
1138 res = new;
1139 new = NULL;
1140 } else
1141 res = ERR_PTR(-EBADF);
1142 }
1143 spin_unlock(&inode->i_lock);
1144 kfree(new);
1145 }
1146 return res;
1147 }
1148 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
1149
nfs_put_lock_context(struct nfs_lock_context * l_ctx)1150 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
1151 {
1152 struct nfs_open_context *ctx = l_ctx->open_context;
1153 struct inode *inode = d_inode(ctx->dentry);
1154
1155 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
1156 return;
1157 list_del_rcu(&l_ctx->list);
1158 spin_unlock(&inode->i_lock);
1159 put_nfs_open_context(ctx);
1160 kfree_rcu(l_ctx, rcu_head);
1161 }
1162 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
1163
1164 /**
1165 * nfs_close_context - Common close_context() routine NFSv2/v3
1166 * @ctx: pointer to context
1167 * @is_sync: is this a synchronous close
1168 *
1169 * Ensure that the attributes are up to date if we're mounted
1170 * with close-to-open semantics and we have cached data that will
1171 * need to be revalidated on open.
1172 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1173 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1174 {
1175 struct nfs_inode *nfsi;
1176 struct inode *inode;
1177
1178 if (!(ctx->mode & FMODE_WRITE))
1179 return;
1180 if (!is_sync)
1181 return;
1182 inode = d_inode(ctx->dentry);
1183 if (nfs_have_read_or_write_delegation(inode))
1184 return;
1185 nfsi = NFS_I(inode);
1186 if (inode->i_mapping->nrpages == 0)
1187 return;
1188 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1189 return;
1190 if (!list_empty(&nfsi->open_files))
1191 return;
1192 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1193 return;
1194 nfs_revalidate_inode(inode,
1195 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1196 }
1197 EXPORT_SYMBOL_GPL(nfs_close_context);
1198
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1199 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1200 fmode_t f_mode,
1201 struct file *filp)
1202 {
1203 struct nfs_open_context *ctx;
1204
1205 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1206 if (!ctx)
1207 return ERR_PTR(-ENOMEM);
1208 nfs_sb_active(dentry->d_sb);
1209 ctx->dentry = dget(dentry);
1210 if (filp)
1211 ctx->cred = get_cred(filp->f_cred);
1212 else
1213 ctx->cred = get_current_cred();
1214 rcu_assign_pointer(ctx->ll_cred, NULL);
1215 ctx->state = NULL;
1216 ctx->mode = f_mode;
1217 ctx->flags = 0;
1218 ctx->error = 0;
1219 ctx->flock_owner = (fl_owner_t)filp;
1220 nfs_init_lock_context(&ctx->lock_context);
1221 ctx->lock_context.open_context = ctx;
1222 INIT_LIST_HEAD(&ctx->list);
1223 ctx->mdsthreshold = NULL;
1224 nfs_localio_file_init(&ctx->nfl);
1225
1226 return ctx;
1227 }
1228 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1229
get_nfs_open_context(struct nfs_open_context * ctx)1230 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1231 {
1232 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1233 return ctx;
1234 return NULL;
1235 }
1236 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1237
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1238 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1239 {
1240 struct inode *inode = d_inode(ctx->dentry);
1241 struct super_block *sb = ctx->dentry->d_sb;
1242
1243 if (!refcount_dec_and_test(&ctx->lock_context.count))
1244 return;
1245 if (!list_empty(&ctx->list)) {
1246 spin_lock(&inode->i_lock);
1247 list_del_rcu(&ctx->list);
1248 spin_unlock(&inode->i_lock);
1249 }
1250 if (inode != NULL)
1251 NFS_PROTO(inode)->close_context(ctx, is_sync);
1252 put_cred(ctx->cred);
1253 dput(ctx->dentry);
1254 nfs_sb_deactive(sb);
1255 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1256 kfree(ctx->mdsthreshold);
1257 nfs_close_local_fh(&ctx->nfl);
1258 kfree_rcu(ctx, rcu_head);
1259 }
1260
put_nfs_open_context(struct nfs_open_context * ctx)1261 void put_nfs_open_context(struct nfs_open_context *ctx)
1262 {
1263 __put_nfs_open_context(ctx, 0);
1264 }
1265 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1266
put_nfs_open_context_sync(struct nfs_open_context * ctx)1267 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1268 {
1269 __put_nfs_open_context(ctx, 1);
1270 }
1271
1272 /*
1273 * Ensure that mmap has a recent RPC credential for use when writing out
1274 * shared pages
1275 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1276 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1277 {
1278 struct inode *inode = d_inode(ctx->dentry);
1279 struct nfs_inode *nfsi = NFS_I(inode);
1280
1281 spin_lock(&inode->i_lock);
1282 if (list_empty(&nfsi->open_files) &&
1283 nfs_ooo_test(nfsi))
1284 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1285 NFS_INO_REVAL_FORCED);
1286 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1287 spin_unlock(&inode->i_lock);
1288 }
1289 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1290
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1291 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1292 {
1293 filp->private_data = get_nfs_open_context(ctx);
1294 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1295 if (list_empty(&ctx->list))
1296 nfs_inode_attach_open_context(ctx);
1297 }
1298 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1299
1300 /*
1301 * Given an inode, search for an open context with the desired characteristics
1302 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1303 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1304 {
1305 struct nfs_inode *nfsi = NFS_I(inode);
1306 struct nfs_open_context *pos, *ctx = NULL;
1307
1308 rcu_read_lock();
1309 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1310 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1311 continue;
1312 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1313 continue;
1314 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1315 continue;
1316 ctx = get_nfs_open_context(pos);
1317 if (ctx)
1318 break;
1319 }
1320 rcu_read_unlock();
1321 return ctx;
1322 }
1323
nfs_file_clear_open_context(struct file * filp)1324 void nfs_file_clear_open_context(struct file *filp)
1325 {
1326 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1327
1328 if (ctx) {
1329 struct inode *inode = d_inode(ctx->dentry);
1330
1331 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1332 /*
1333 * We fatal error on write before. Try to writeback
1334 * every page again.
1335 */
1336 if (ctx->error < 0)
1337 invalidate_inode_pages2(inode->i_mapping);
1338 filp->private_data = NULL;
1339 put_nfs_open_context_sync(ctx);
1340 }
1341 }
1342
1343 /*
1344 * These allocate and release file read/write context information.
1345 */
nfs_open(struct inode * inode,struct file * filp)1346 int nfs_open(struct inode *inode, struct file *filp)
1347 {
1348 struct nfs_open_context *ctx;
1349
1350 ctx = alloc_nfs_open_context(file_dentry(filp),
1351 flags_to_mode(filp->f_flags), filp);
1352 if (IS_ERR(ctx))
1353 return PTR_ERR(ctx);
1354 nfs_file_set_open_context(filp, ctx);
1355 put_nfs_open_context(ctx);
1356 nfs_fscache_open_file(inode, filp);
1357 return 0;
1358 }
1359
1360 /*
1361 * This function is called whenever some part of NFS notices that
1362 * the cached attributes have to be refreshed.
1363 */
1364 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1365 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1366 {
1367 int status = -ESTALE;
1368 struct nfs_fattr *fattr = NULL;
1369 struct nfs_inode *nfsi = NFS_I(inode);
1370
1371 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1372 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1373
1374 trace_nfs_revalidate_inode_enter(inode);
1375
1376 if (is_bad_inode(inode))
1377 goto out;
1378 if (NFS_STALE(inode))
1379 goto out;
1380
1381 /* pNFS: Attributes aren't updated until we layoutcommit */
1382 if (S_ISREG(inode->i_mode)) {
1383 status = pnfs_sync_inode(inode, false);
1384 if (status)
1385 goto out;
1386 }
1387
1388 status = -ENOMEM;
1389 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1390 if (fattr == NULL)
1391 goto out;
1392
1393 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1394
1395 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1396 if (status != 0) {
1397 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1398 inode->i_sb->s_id,
1399 (unsigned long long)NFS_FILEID(inode), status);
1400 switch (status) {
1401 case -ETIMEDOUT:
1402 /* A soft timeout occurred. Use cached information? */
1403 if (server->flags & NFS_MOUNT_SOFTREVAL)
1404 status = 0;
1405 break;
1406 case -ESTALE:
1407 if (!S_ISDIR(inode->i_mode))
1408 nfs_set_inode_stale(inode);
1409 else
1410 nfs_zap_caches(inode);
1411 }
1412 goto out;
1413 }
1414
1415 status = nfs_refresh_inode(inode, fattr);
1416 if (status) {
1417 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1418 inode->i_sb->s_id,
1419 (unsigned long long)NFS_FILEID(inode), status);
1420 goto out;
1421 }
1422
1423 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1424 nfs_zap_acl_cache(inode);
1425
1426 nfs_setsecurity(inode, fattr);
1427
1428 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1429 inode->i_sb->s_id,
1430 (unsigned long long)NFS_FILEID(inode));
1431
1432 out:
1433 nfs_free_fattr(fattr);
1434 trace_nfs_revalidate_inode_exit(inode, status);
1435 return status;
1436 }
1437
nfs_attribute_cache_expired(struct inode * inode)1438 int nfs_attribute_cache_expired(struct inode *inode)
1439 {
1440 if (nfs_have_delegated_attributes(inode))
1441 return 0;
1442 return nfs_attribute_timeout(inode);
1443 }
1444
1445 /**
1446 * nfs_revalidate_inode - Revalidate the inode attributes
1447 * @inode: pointer to inode struct
1448 * @flags: cache flags to check
1449 *
1450 * Updates inode attribute information by retrieving the data from the server.
1451 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1452 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1453 {
1454 if (!nfs_check_cache_invalid(inode, flags))
1455 return NFS_STALE(inode) ? -ESTALE : 0;
1456 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1457 }
1458 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1459
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1460 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1461 {
1462 int ret;
1463
1464 nfs_fscache_invalidate(inode, 0);
1465 if (mapping->nrpages != 0) {
1466 if (S_ISREG(inode->i_mode)) {
1467 ret = nfs_sync_mapping(mapping);
1468 if (ret < 0)
1469 return ret;
1470 }
1471 ret = invalidate_inode_pages2(mapping);
1472 if (ret < 0)
1473 return ret;
1474 }
1475 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1476
1477 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1478 inode->i_sb->s_id,
1479 (unsigned long long)NFS_FILEID(inode));
1480 return 0;
1481 }
1482
1483 /**
1484 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1485 * @mapping: pointer to mapping
1486 *
1487 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1488 */
nfs_clear_invalid_mapping(struct address_space * mapping)1489 int nfs_clear_invalid_mapping(struct address_space *mapping)
1490 {
1491 struct inode *inode = mapping->host;
1492 struct nfs_inode *nfsi = NFS_I(inode);
1493 unsigned long *bitlock = &nfsi->flags;
1494 int ret = 0;
1495
1496 /*
1497 * We must clear NFS_INO_INVALID_DATA first to ensure that
1498 * invalidations that come in while we're shooting down the mappings
1499 * are respected. But, that leaves a race window where one revalidator
1500 * can clear the flag, and then another checks it before the mapping
1501 * gets invalidated. Fix that by serializing access to this part of
1502 * the function.
1503 *
1504 * At the same time, we need to allow other tasks to see whether we
1505 * might be in the middle of invalidating the pages, so we only set
1506 * the bit lock here if it looks like we're going to be doing that.
1507 */
1508 for (;;) {
1509 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1510 nfs_wait_bit_killable,
1511 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1512 if (ret)
1513 goto out;
1514 smp_rmb(); /* pairs with smp_wmb() below */
1515 if (test_bit(NFS_INO_INVALIDATING, bitlock))
1516 continue;
1517 /* pairs with nfs_set_cache_invalid()'s smp_store_release() */
1518 if (!(smp_load_acquire(&nfsi->cache_validity) & NFS_INO_INVALID_DATA))
1519 goto out;
1520 /* Slow-path that double-checks with spinlock held */
1521 spin_lock(&inode->i_lock);
1522 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1523 spin_unlock(&inode->i_lock);
1524 continue;
1525 }
1526 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1527 break;
1528 spin_unlock(&inode->i_lock);
1529 goto out;
1530 }
1531
1532 set_bit(NFS_INO_INVALIDATING, bitlock);
1533 smp_wmb();
1534 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1535 nfs_ooo_clear(nfsi);
1536 spin_unlock(&inode->i_lock);
1537 trace_nfs_invalidate_mapping_enter(inode);
1538 ret = nfs_invalidate_mapping(inode, mapping);
1539 trace_nfs_invalidate_mapping_exit(inode, ret);
1540
1541 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1542 smp_mb__after_atomic();
1543 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1544 out:
1545 return ret;
1546 }
1547
nfs_mapping_need_revalidate_inode(struct inode * inode)1548 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1549 {
1550 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1551 NFS_STALE(inode);
1552 }
1553
nfs_revalidate_mapping_rcu(struct inode * inode)1554 int nfs_revalidate_mapping_rcu(struct inode *inode)
1555 {
1556 struct nfs_inode *nfsi = NFS_I(inode);
1557 unsigned long *bitlock = &nfsi->flags;
1558 int ret = 0;
1559
1560 if (IS_SWAPFILE(inode))
1561 goto out;
1562 if (nfs_mapping_need_revalidate_inode(inode)) {
1563 ret = -ECHILD;
1564 goto out;
1565 }
1566 spin_lock(&inode->i_lock);
1567 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1568 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1569 ret = -ECHILD;
1570 spin_unlock(&inode->i_lock);
1571 out:
1572 return ret;
1573 }
1574
1575 /**
1576 * nfs_revalidate_mapping - Revalidate the pagecache
1577 * @inode: pointer to host inode
1578 * @mapping: pointer to mapping
1579 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1580 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1581 {
1582 /* swapfiles are not supposed to be shared. */
1583 if (IS_SWAPFILE(inode))
1584 return 0;
1585
1586 if (nfs_mapping_need_revalidate_inode(inode)) {
1587 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1588 if (ret < 0)
1589 return ret;
1590 }
1591
1592 return nfs_clear_invalid_mapping(mapping);
1593 }
1594
nfs_file_has_writers(struct nfs_inode * nfsi)1595 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1596 {
1597 struct inode *inode = &nfsi->vfs_inode;
1598
1599 if (!S_ISREG(inode->i_mode))
1600 return false;
1601 if (list_empty(&nfsi->open_files))
1602 return false;
1603 return inode_is_open_for_write(inode);
1604 }
1605
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1606 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1607 {
1608 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1609 }
1610
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1611 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1612 {
1613 struct timespec64 ts;
1614
1615 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1616 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1617 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1618 inode_set_iversion_raw(inode, fattr->change_attr);
1619 if (S_ISDIR(inode->i_mode))
1620 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1621 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1622 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1623 }
1624 /* If we have atomic WCC data, we may update some attributes */
1625 ts = inode_get_ctime(inode);
1626 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1627 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1628 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1629 inode_set_ctime_to_ts(inode, fattr->ctime);
1630 }
1631
1632 ts = inode_get_mtime(inode);
1633 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1634 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1635 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1636 inode_set_mtime_to_ts(inode, fattr->mtime);
1637 }
1638 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1639 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1640 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1641 && !nfs_have_writebacks(inode)) {
1642 trace_nfs_size_wcc(inode, fattr->size);
1643 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1644 }
1645 }
1646
1647 /**
1648 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1649 * @inode: pointer to inode
1650 * @fattr: updated attributes
1651 *
1652 * Verifies the attribute cache. If we have just changed the attributes,
1653 * so that fattr carries weak cache consistency data, then it may
1654 * also update the ctime/mtime/change_attribute.
1655 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1656 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1657 {
1658 struct nfs_inode *nfsi = NFS_I(inode);
1659 loff_t cur_size, new_isize;
1660 unsigned long invalid = 0;
1661 struct timespec64 ts;
1662
1663 if (nfs_have_delegated_attributes(inode))
1664 return 0;
1665
1666 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1667 /* Only a mounted-on-fileid? Just exit */
1668 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1669 return 0;
1670 /* Has the inode gone and changed behind our back? */
1671 } else if (nfsi->fileid != fattr->fileid) {
1672 /* Is this perhaps the mounted-on fileid? */
1673 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1674 nfsi->fileid == fattr->mounted_on_fileid)
1675 return 0;
1676 return -ESTALE;
1677 }
1678 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1679 return -ESTALE;
1680
1681
1682 if (!nfs_file_has_buffered_writers(nfsi)) {
1683 /* Verify a few of the more important attributes */
1684 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1685 invalid |= NFS_INO_INVALID_CHANGE;
1686
1687 ts = inode_get_mtime(inode);
1688 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1689 invalid |= NFS_INO_INVALID_MTIME;
1690
1691 ts = inode_get_ctime(inode);
1692 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1693 invalid |= NFS_INO_INVALID_CTIME;
1694
1695 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1696 cur_size = i_size_read(inode);
1697 new_isize = nfs_size_to_loff_t(fattr->size);
1698 if (cur_size != new_isize)
1699 invalid |= NFS_INO_INVALID_SIZE;
1700 }
1701 }
1702
1703 /* Have any file permissions changed? */
1704 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1705 invalid |= NFS_INO_INVALID_MODE;
1706 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1707 invalid |= NFS_INO_INVALID_OTHER;
1708 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1709 invalid |= NFS_INO_INVALID_OTHER;
1710
1711 /* Has the link count changed? */
1712 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1713 invalid |= NFS_INO_INVALID_NLINK;
1714
1715 ts = inode_get_atime(inode);
1716 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1717 invalid |= NFS_INO_INVALID_ATIME;
1718
1719 if (invalid != 0)
1720 nfs_set_cache_invalid(inode, invalid);
1721
1722 nfsi->read_cache_jiffies = fattr->time_start;
1723 return 0;
1724 }
1725
1726 static atomic_long_t nfs_attr_generation_counter;
1727
nfs_read_attr_generation_counter(void)1728 static unsigned long nfs_read_attr_generation_counter(void)
1729 {
1730 return atomic_long_read(&nfs_attr_generation_counter);
1731 }
1732
nfs_inc_attr_generation_counter(void)1733 unsigned long nfs_inc_attr_generation_counter(void)
1734 {
1735 return atomic_long_inc_return(&nfs_attr_generation_counter);
1736 }
1737 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1738
nfs_fattr_init(struct nfs_fattr * fattr)1739 void nfs_fattr_init(struct nfs_fattr *fattr)
1740 {
1741 fattr->valid = 0;
1742 fattr->time_start = jiffies;
1743 fattr->gencount = nfs_inc_attr_generation_counter();
1744 fattr->owner_name = NULL;
1745 fattr->group_name = NULL;
1746 fattr->mdsthreshold = NULL;
1747 }
1748 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1749
1750 /**
1751 * nfs_fattr_set_barrier
1752 * @fattr: attributes
1753 *
1754 * Used to set a barrier after an attribute was updated. This
1755 * barrier ensures that older attributes from RPC calls that may
1756 * have raced with our update cannot clobber these new values.
1757 * Note that you are still responsible for ensuring that other
1758 * operations which change the attribute on the server do not
1759 * collide.
1760 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1761 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1762 {
1763 fattr->gencount = nfs_inc_attr_generation_counter();
1764 }
1765
nfs_alloc_fattr(void)1766 struct nfs_fattr *nfs_alloc_fattr(void)
1767 {
1768 struct nfs_fattr *fattr;
1769
1770 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1771 if (fattr != NULL) {
1772 nfs_fattr_init(fattr);
1773 fattr->label = NULL;
1774 }
1775 return fattr;
1776 }
1777 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1778
nfs_alloc_fattr_with_label(struct nfs_server * server)1779 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1780 {
1781 struct nfs_fattr *fattr = nfs_alloc_fattr();
1782
1783 if (!fattr)
1784 return NULL;
1785
1786 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1787 if (IS_ERR(fattr->label)) {
1788 kfree(fattr);
1789 return NULL;
1790 }
1791
1792 return fattr;
1793 }
1794 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1795
nfs_alloc_fhandle(void)1796 struct nfs_fh *nfs_alloc_fhandle(void)
1797 {
1798 struct nfs_fh *fh;
1799
1800 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1801 if (fh != NULL)
1802 fh->size = 0;
1803 return fh;
1804 }
1805 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1806
1807 #ifdef NFS_DEBUG
1808 /*
1809 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1810 * in the same way that wireshark does
1811 *
1812 * @fh: file handle
1813 *
1814 * For debugging only.
1815 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1816 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1817 {
1818 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1819 * not on the result */
1820 return nfs_fhandle_hash(fh);
1821 }
1822 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1823
1824 /*
1825 * _nfs_display_fhandle - display an NFS file handle on the console
1826 *
1827 * @fh: file handle to display
1828 * @caption: display caption
1829 *
1830 * For debugging only.
1831 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1832 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1833 {
1834 unsigned short i;
1835
1836 if (fh == NULL || fh->size == 0) {
1837 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1838 return;
1839 }
1840
1841 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1842 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1843 for (i = 0; i < fh->size; i += 16) {
1844 __be32 *pos = (__be32 *)&fh->data[i];
1845
1846 switch ((fh->size - i - 1) >> 2) {
1847 case 0:
1848 printk(KERN_DEFAULT " %08x\n",
1849 be32_to_cpup(pos));
1850 break;
1851 case 1:
1852 printk(KERN_DEFAULT " %08x %08x\n",
1853 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1854 break;
1855 case 2:
1856 printk(KERN_DEFAULT " %08x %08x %08x\n",
1857 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1858 be32_to_cpup(pos + 2));
1859 break;
1860 default:
1861 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1862 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1863 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1864 }
1865 }
1866 }
1867 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1868 #endif
1869
1870 /**
1871 * nfs_inode_attrs_cmp_generic - compare attributes
1872 * @fattr: attributes
1873 * @inode: pointer to inode
1874 *
1875 * Attempt to divine whether or not an RPC call reply carrying stale
1876 * attributes got scheduled after another call carrying updated ones.
1877 * Note also the check for wraparound of 'attr_gencount'
1878 *
1879 * The function returns '1' if it thinks the attributes in @fattr are
1880 * more recent than the ones cached in @inode. Otherwise it returns
1881 * the value '0'.
1882 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1883 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1884 const struct inode *inode)
1885 {
1886 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1887
1888 return (long)(fattr->gencount - attr_gencount) > 0 ||
1889 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1890 }
1891
1892 /**
1893 * nfs_inode_attrs_cmp_monotonic - compare attributes
1894 * @fattr: attributes
1895 * @inode: pointer to inode
1896 *
1897 * Attempt to divine whether or not an RPC call reply carrying stale
1898 * attributes got scheduled after another call carrying updated ones.
1899 *
1900 * We assume that the server observes monotonic semantics for
1901 * the change attribute, so a larger value means that the attributes in
1902 * @fattr are more recent, in which case the function returns the
1903 * value '1'.
1904 * A return value of '0' indicates no measurable change
1905 * A return value of '-1' means that the attributes in @inode are
1906 * more recent.
1907 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1908 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1909 const struct inode *inode)
1910 {
1911 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1912 if (diff > 0)
1913 return 1;
1914 return diff == 0 ? 0 : -1;
1915 }
1916
1917 /**
1918 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1919 * @fattr: attributes
1920 * @inode: pointer to inode
1921 *
1922 * Attempt to divine whether or not an RPC call reply carrying stale
1923 * attributes got scheduled after another call carrying updated ones.
1924 *
1925 * We assume that the server observes strictly monotonic semantics for
1926 * the change attribute, so a larger value means that the attributes in
1927 * @fattr are more recent, in which case the function returns the
1928 * value '1'.
1929 * A return value of '-1' means that the attributes in @inode are
1930 * more recent or unchanged.
1931 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1932 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1933 const struct inode *inode)
1934 {
1935 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1936 }
1937
1938 /**
1939 * nfs_inode_attrs_cmp - compare attributes
1940 * @fattr: attributes
1941 * @inode: pointer to inode
1942 *
1943 * This function returns '1' if it thinks the attributes in @fattr are
1944 * more recent than the ones cached in @inode. It returns '-1' if
1945 * the attributes in @inode are more recent than the ones in @fattr,
1946 * and it returns 0 if not sure.
1947 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1948 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1949 const struct inode *inode)
1950 {
1951 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1952 return 1;
1953 switch (NFS_SERVER(inode)->change_attr_type) {
1954 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1955 break;
1956 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1957 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1958 break;
1959 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1960 default:
1961 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1962 break;
1963 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1964 }
1965 return 0;
1966 }
1967
1968 /**
1969 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1970 * @fattr: attributes
1971 * @inode: pointer to inode
1972 *
1973 * Returns '1' if the last attribute update left the inode cached
1974 * attributes in a partially unrevalidated state, and @fattr
1975 * matches the change attribute of that partial update.
1976 * Otherwise returns '0'.
1977 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1978 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1979 const struct inode *inode)
1980 {
1981 const unsigned long check_valid =
1982 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1983 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1984 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1985 NFS_INO_INVALID_NLINK | NFS_INO_INVALID_BTIME;
1986 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1987 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1988
1989 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1990 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
1991 (cache_validity & check_valid) != 0 &&
1992 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1993 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1994 return 1;
1995 return 0;
1996 }
1997
nfs_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)1998 static void nfs_ooo_merge(struct nfs_inode *nfsi,
1999 u64 start, u64 end)
2000 {
2001 int i, cnt;
2002
2003 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
2004 /* No point merging anything */
2005 return;
2006
2007 if (!nfsi->ooo) {
2008 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
2009 if (!nfsi->ooo) {
2010 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2011 return;
2012 }
2013 nfsi->ooo->cnt = 0;
2014 }
2015
2016 /* add this range, merging if possible */
2017 cnt = nfsi->ooo->cnt;
2018 for (i = 0; i < cnt; i++) {
2019 if (end == nfsi->ooo->gap[i].start)
2020 end = nfsi->ooo->gap[i].end;
2021 else if (start == nfsi->ooo->gap[i].end)
2022 start = nfsi->ooo->gap[i].start;
2023 else
2024 continue;
2025 /* Remove 'i' from table and loop to insert the new range */
2026 cnt -= 1;
2027 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
2028 i = -1;
2029 }
2030 if (start != end) {
2031 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
2032 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2033 kfree(nfsi->ooo);
2034 nfsi->ooo = NULL;
2035 return;
2036 }
2037 nfsi->ooo->gap[cnt].start = start;
2038 nfsi->ooo->gap[cnt].end = end;
2039 cnt += 1;
2040 }
2041 nfsi->ooo->cnt = cnt;
2042 }
2043
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)2044 static void nfs_ooo_record(struct nfs_inode *nfsi,
2045 struct nfs_fattr *fattr)
2046 {
2047 /* This reply was out-of-order, so record in the
2048 * pre/post change id, possibly cancelling
2049 * gaps created when iversion was jumpped forward.
2050 */
2051 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
2052 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
2053 nfs_ooo_merge(nfsi,
2054 fattr->change_attr,
2055 fattr->pre_change_attr);
2056 }
2057
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)2058 static int nfs_refresh_inode_locked(struct inode *inode,
2059 struct nfs_fattr *fattr)
2060 {
2061 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2062 int ret = 0;
2063
2064 trace_nfs_refresh_inode_enter(inode);
2065
2066 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
2067 ret = nfs_update_inode(inode, fattr);
2068 else {
2069 nfs_ooo_record(NFS_I(inode), fattr);
2070
2071 if (attr_cmp == 0)
2072 ret = nfs_check_inode_attributes(inode, fattr);
2073 }
2074
2075 trace_nfs_refresh_inode_exit(inode, ret);
2076 return ret;
2077 }
2078
2079 /**
2080 * nfs_refresh_inode - try to update the inode attribute cache
2081 * @inode: pointer to inode
2082 * @fattr: updated attributes
2083 *
2084 * Check that an RPC call that returned attributes has not overlapped with
2085 * other recent updates of the inode metadata, then decide whether it is
2086 * safe to do a full update of the inode attributes, or whether just to
2087 * call nfs_check_inode_attributes.
2088 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)2089 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
2090 {
2091 int status;
2092
2093 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2094 return 0;
2095 spin_lock(&inode->i_lock);
2096 status = nfs_refresh_inode_locked(inode, fattr);
2097 spin_unlock(&inode->i_lock);
2098
2099 return status;
2100 }
2101 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
2102
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)2103 static int nfs_post_op_update_inode_locked(struct inode *inode,
2104 struct nfs_fattr *fattr, unsigned int invalid)
2105 {
2106 if (S_ISDIR(inode->i_mode))
2107 invalid |= NFS_INO_INVALID_DATA;
2108 nfs_set_cache_invalid(inode, invalid);
2109 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
2110 return 0;
2111 return nfs_refresh_inode_locked(inode, fattr);
2112 }
2113
2114 /**
2115 * nfs_post_op_update_inode - try to update the inode attribute cache
2116 * @inode: pointer to inode
2117 * @fattr: updated attributes
2118 *
2119 * After an operation that has changed the inode metadata, mark the
2120 * attribute cache as being invalid, then try to update it.
2121 *
2122 * NB: if the server didn't return any post op attributes, this
2123 * function will force the retrieval of attributes before the next
2124 * NFS request. Thus it should be used only for operations that
2125 * are expected to change one or more attributes, to avoid
2126 * unnecessary NFS requests and trips through nfs_update_inode().
2127 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)2128 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2129 {
2130 int status;
2131
2132 spin_lock(&inode->i_lock);
2133 nfs_fattr_set_barrier(fattr);
2134 status = nfs_post_op_update_inode_locked(inode, fattr,
2135 NFS_INO_INVALID_CHANGE
2136 | NFS_INO_INVALID_CTIME
2137 | NFS_INO_REVAL_FORCED);
2138 spin_unlock(&inode->i_lock);
2139
2140 return status;
2141 }
2142 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
2143
2144 /**
2145 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
2146 * @inode: pointer to inode
2147 * @fattr: updated attributes
2148 *
2149 * After an operation that has changed the inode metadata, mark the
2150 * attribute cache as being invalid, then try to update it. Fake up
2151 * weak cache consistency data, if none exist.
2152 *
2153 * This function is mainly designed to be used by the ->write_done() functions.
2154 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)2155 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
2156 {
2157 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2158 int status;
2159
2160 /* Don't do a WCC update if these attributes are already stale */
2161 if (attr_cmp < 0)
2162 return 0;
2163 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
2164 /* Record the pre/post change info before clearing PRECHANGE */
2165 nfs_ooo_record(NFS_I(inode), fattr);
2166 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
2167 | NFS_ATTR_FATTR_PRESIZE
2168 | NFS_ATTR_FATTR_PREMTIME
2169 | NFS_ATTR_FATTR_PRECTIME);
2170 goto out_noforce;
2171 }
2172 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2173 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
2174 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
2175 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
2176 }
2177 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
2178 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2179 fattr->pre_ctime = inode_get_ctime(inode);
2180 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2181 }
2182 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2183 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2184 fattr->pre_mtime = inode_get_mtime(inode);
2185 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2186 }
2187 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2188 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2189 fattr->pre_size = i_size_read(inode);
2190 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2191 }
2192 out_noforce:
2193 status = nfs_post_op_update_inode_locked(inode, fattr,
2194 NFS_INO_INVALID_CHANGE
2195 | NFS_INO_INVALID_CTIME
2196 | NFS_INO_INVALID_MTIME
2197 | NFS_INO_INVALID_BLOCKS);
2198 return status;
2199 }
2200
2201 /**
2202 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2203 * @inode: pointer to inode
2204 * @fattr: updated attributes
2205 *
2206 * After an operation that has changed the inode metadata, mark the
2207 * attribute cache as being invalid, then try to update it. Fake up
2208 * weak cache consistency data, if none exist.
2209 *
2210 * This function is mainly designed to be used by the ->write_done() functions.
2211 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2212 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2213 {
2214 int status;
2215
2216 spin_lock(&inode->i_lock);
2217 nfs_fattr_set_barrier(fattr);
2218 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2219 spin_unlock(&inode->i_lock);
2220 return status;
2221 }
2222 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2223
2224
2225 /*
2226 * Many nfs protocol calls return the new file attributes after
2227 * an operation. Here we update the inode to reflect the state
2228 * of the server's inode.
2229 *
2230 * This is a bit tricky because we have to make sure all dirty pages
2231 * have been sent off to the server before calling invalidate_inode_pages.
2232 * To make sure no other process adds more write requests while we try
2233 * our best to flush them, we make them sleep during the attribute refresh.
2234 *
2235 * A very similar scenario holds for the dir cache.
2236 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2237 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2238 {
2239 struct nfs_server *server = NFS_SERVER(inode);
2240 struct nfs_inode *nfsi = NFS_I(inode);
2241 loff_t cur_isize, new_isize;
2242 u64 fattr_supported = server->fattr_valid;
2243 unsigned long invalid = 0;
2244 unsigned long now = jiffies;
2245 unsigned long save_cache_validity;
2246 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2247 bool cache_revalidated = true;
2248 bool attr_changed = false;
2249 bool have_delegation;
2250
2251 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%llx)\n",
2252 __func__, inode->i_sb->s_id, inode->i_ino,
2253 nfs_display_fhandle_hash(NFS_FH(inode)),
2254 icount_read(inode), fattr->valid);
2255
2256 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2257 /* Only a mounted-on-fileid? Just exit */
2258 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2259 return 0;
2260 /* Has the inode gone and changed behind our back? */
2261 } else if (nfsi->fileid != fattr->fileid) {
2262 /* Is this perhaps the mounted-on fileid? */
2263 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2264 nfsi->fileid == fattr->mounted_on_fileid)
2265 return 0;
2266 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2267 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2268 NFS_SERVER(inode)->nfs_client->cl_hostname,
2269 inode->i_sb->s_id, (long long)nfsi->fileid,
2270 (long long)fattr->fileid);
2271 goto out_err;
2272 }
2273
2274 /*
2275 * Make sure the inode's type hasn't changed.
2276 */
2277 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2278 /*
2279 * Big trouble! The inode has become a different object.
2280 */
2281 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2282 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2283 goto out_err;
2284 }
2285
2286 /* Update the fsid? */
2287 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2288 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2289 !IS_AUTOMOUNT(inode))
2290 server->fsid = fattr->fsid;
2291
2292 /* Save the delegation state before clearing cache_validity */
2293 have_delegation = nfs_have_delegated_attributes(inode);
2294
2295 /*
2296 * Update the read time so we don't revalidate too often.
2297 */
2298 nfsi->read_cache_jiffies = fattr->time_start;
2299
2300 /* Fix up any delegated attributes in the struct nfs_fattr */
2301 nfs_fattr_fixup_delegated(inode, fattr);
2302
2303 save_cache_validity = nfsi->cache_validity;
2304 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2305 | NFS_INO_INVALID_ATIME
2306 | NFS_INO_REVAL_FORCED
2307 | NFS_INO_INVALID_BLOCKS);
2308
2309 /* Do atomic weak cache consistency updates */
2310 nfs_wcc_update_inode(inode, fattr);
2311
2312 if (pnfs_layoutcommit_outstanding(inode)) {
2313 nfsi->cache_validity |=
2314 save_cache_validity &
2315 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2316 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2317 NFS_INO_INVALID_BLOCKS);
2318 cache_revalidated = false;
2319 }
2320
2321 /* More cache consistency checks */
2322 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2323 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2324 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2325 /* There is one remaining gap that hasn't been
2326 * merged into iversion - do that now.
2327 */
2328 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2329 kfree(nfsi->ooo);
2330 nfsi->ooo = NULL;
2331 }
2332 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2333 /* Could it be a race with writeback? */
2334 if (!(have_writers || have_delegation)) {
2335 invalid |= NFS_INO_INVALID_DATA
2336 | NFS_INO_INVALID_ACCESS
2337 | NFS_INO_INVALID_ACL
2338 | NFS_INO_INVALID_XATTR;
2339 /* Force revalidate of all attributes */
2340 save_cache_validity |= NFS_INO_INVALID_CTIME
2341 | NFS_INO_INVALID_MTIME
2342 | NFS_INO_INVALID_SIZE
2343 | NFS_INO_INVALID_BLOCKS
2344 | NFS_INO_INVALID_NLINK
2345 | NFS_INO_INVALID_MODE
2346 | NFS_INO_INVALID_OTHER
2347 | NFS_INO_INVALID_BTIME;
2348 if (S_ISDIR(inode->i_mode))
2349 nfs_force_lookup_revalidate(inode);
2350 attr_changed = true;
2351 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2352 inode->i_sb->s_id,
2353 inode->i_ino);
2354 } else if (!have_delegation) {
2355 nfs_ooo_record(nfsi, fattr);
2356 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2357 fattr->change_attr);
2358 }
2359 inode_set_iversion_raw(inode, fattr->change_attr);
2360 }
2361 } else {
2362 nfsi->cache_validity |=
2363 save_cache_validity & NFS_INO_INVALID_CHANGE;
2364 if (!have_delegation ||
2365 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2366 cache_revalidated = false;
2367 }
2368
2369 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2370 inode_set_mtime_to_ts(inode, fattr->mtime);
2371 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2372 nfsi->cache_validity |=
2373 save_cache_validity & NFS_INO_INVALID_MTIME;
2374
2375 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2376 inode_set_ctime_to_ts(inode, fattr->ctime);
2377 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2378 nfsi->cache_validity |=
2379 save_cache_validity & NFS_INO_INVALID_CTIME;
2380
2381 if (fattr->valid & NFS_ATTR_FATTR_BTIME)
2382 nfsi->btime = fattr->btime;
2383 else if (fattr_supported & NFS_ATTR_FATTR_BTIME)
2384 nfsi->cache_validity |=
2385 save_cache_validity & NFS_INO_INVALID_BTIME;
2386
2387 /* Check if our cached file size is stale */
2388 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2389 new_isize = nfs_size_to_loff_t(fattr->size);
2390 cur_isize = i_size_read(inode);
2391 if (new_isize != cur_isize && !have_delegation) {
2392 /* Do we perhaps have any outstanding writes, or has
2393 * the file grown beyond our last write? */
2394 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2395 trace_nfs_size_update(inode, new_isize);
2396 i_size_write(inode, new_isize);
2397 if (!have_writers)
2398 invalid |= NFS_INO_INVALID_DATA;
2399 }
2400 }
2401 if (new_isize == 0 &&
2402 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2403 NFS_ATTR_FATTR_BLOCKS_USED))) {
2404 fattr->du.nfs3.used = 0;
2405 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2406 }
2407 } else
2408 nfsi->cache_validity |=
2409 save_cache_validity & NFS_INO_INVALID_SIZE;
2410
2411 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2412 inode_set_atime_to_ts(inode, fattr->atime);
2413 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2414 nfsi->cache_validity |=
2415 save_cache_validity & NFS_INO_INVALID_ATIME;
2416
2417 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2418 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2419 umode_t newmode = inode->i_mode & S_IFMT;
2420 newmode |= fattr->mode & S_IALLUGO;
2421 inode->i_mode = newmode;
2422 invalid |= NFS_INO_INVALID_ACCESS
2423 | NFS_INO_INVALID_ACL;
2424 }
2425 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2426 nfsi->cache_validity |=
2427 save_cache_validity & NFS_INO_INVALID_MODE;
2428
2429 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2430 if (!uid_eq(inode->i_uid, fattr->uid)) {
2431 invalid |= NFS_INO_INVALID_ACCESS
2432 | NFS_INO_INVALID_ACL;
2433 inode->i_uid = fattr->uid;
2434 }
2435 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2436 nfsi->cache_validity |=
2437 save_cache_validity & NFS_INO_INVALID_OTHER;
2438
2439 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2440 if (!gid_eq(inode->i_gid, fattr->gid)) {
2441 invalid |= NFS_INO_INVALID_ACCESS
2442 | NFS_INO_INVALID_ACL;
2443 inode->i_gid = fattr->gid;
2444 }
2445 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2446 nfsi->cache_validity |=
2447 save_cache_validity & NFS_INO_INVALID_OTHER;
2448
2449 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2450 if (inode->i_nlink != fattr->nlink)
2451 set_nlink(inode, fattr->nlink);
2452 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2453 nfsi->cache_validity |=
2454 save_cache_validity & NFS_INO_INVALID_NLINK;
2455
2456 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2457 /*
2458 * report the blocks in 512byte units
2459 */
2460 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2461 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2462 nfsi->cache_validity |=
2463 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2464
2465 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2466 inode->i_blocks = fattr->du.nfs2.blocks;
2467 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2468 nfsi->cache_validity |=
2469 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2470
2471 /* Update attrtimeo value if we're out of the unstable period */
2472 if (attr_changed) {
2473 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2474 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2475 nfsi->attrtimeo_timestamp = now;
2476 /* Set barrier to be more recent than all outstanding updates */
2477 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2478 } else {
2479 if (cache_revalidated) {
2480 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2481 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2482 nfsi->attrtimeo <<= 1;
2483 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2484 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2485 }
2486 nfsi->attrtimeo_timestamp = now;
2487 }
2488 /* Set the barrier to be more recent than this fattr */
2489 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2490 nfsi->attr_gencount = fattr->gencount;
2491 }
2492
2493 /* Don't invalidate the data if we were to blame */
2494 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2495 || S_ISLNK(inode->i_mode)))
2496 invalid &= ~NFS_INO_INVALID_DATA;
2497 nfs_set_cache_invalid(inode, invalid);
2498
2499 return 0;
2500 out_err:
2501 /*
2502 * No need to worry about unhashing the dentry, as the
2503 * lookup validation will know that the inode is bad.
2504 * (But we fall through to invalidate the caches.)
2505 */
2506 nfs_set_inode_stale_locked(inode);
2507 return -ESTALE;
2508 }
2509
nfs_alloc_inode(struct super_block * sb)2510 struct inode *nfs_alloc_inode(struct super_block *sb)
2511 {
2512 struct nfs_inode *nfsi;
2513 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2514 if (!nfsi)
2515 return NULL;
2516 nfsi->flags = 0UL;
2517 nfsi->cache_validity = 0UL;
2518 nfsi->ooo = NULL;
2519 #if IS_ENABLED(CONFIG_NFS_V4)
2520 nfsi->nfs4_acl = NULL;
2521 #endif /* CONFIG_NFS_V4 */
2522 #ifdef CONFIG_NFS_V4_2
2523 nfsi->xattr_cache = NULL;
2524 #endif
2525 nfs_netfs_inode_init(nfsi);
2526
2527 return &nfsi->vfs_inode;
2528 }
2529 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2530
nfs_free_inode(struct inode * inode)2531 void nfs_free_inode(struct inode *inode)
2532 {
2533 kfree(NFS_I(inode)->ooo);
2534 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2535 }
2536 EXPORT_SYMBOL_GPL(nfs_free_inode);
2537
nfs4_init_once(struct nfs_inode * nfsi)2538 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2539 {
2540 #if IS_ENABLED(CONFIG_NFS_V4)
2541 INIT_LIST_HEAD(&nfsi->open_states);
2542 nfsi->delegation = NULL;
2543 init_rwsem(&nfsi->rwsem);
2544 nfsi->layout = NULL;
2545 #endif
2546 }
2547
init_once(void * foo)2548 static void init_once(void *foo)
2549 {
2550 struct nfs_inode *nfsi = foo;
2551
2552 inode_init_once(&nfsi->vfs_inode);
2553 INIT_LIST_HEAD(&nfsi->open_files);
2554 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2555 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2556 nfs4_init_once(nfsi);
2557 }
2558
nfs_init_inodecache(void)2559 static int __init nfs_init_inodecache(void)
2560 {
2561 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2562 sizeof(struct nfs_inode),
2563 0, (SLAB_RECLAIM_ACCOUNT|
2564 SLAB_ACCOUNT),
2565 init_once);
2566 if (nfs_inode_cachep == NULL)
2567 return -ENOMEM;
2568
2569 return 0;
2570 }
2571
nfs_destroy_inodecache(void)2572 static void nfs_destroy_inodecache(void)
2573 {
2574 /*
2575 * Make sure all delayed rcu free inodes are flushed before we
2576 * destroy cache.
2577 */
2578 rcu_barrier();
2579 kmem_cache_destroy(nfs_inode_cachep);
2580 }
2581
2582 struct workqueue_struct *nfslocaliod_workqueue;
2583 struct workqueue_struct *nfsiod_workqueue;
2584 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2585
2586 /*
2587 * Destroy the nfsiod workqueues
2588 */
nfsiod_stop(void)2589 static void nfsiod_stop(void)
2590 {
2591 struct workqueue_struct *wq;
2592
2593 wq = nfsiod_workqueue;
2594 if (wq != NULL) {
2595 nfsiod_workqueue = NULL;
2596 destroy_workqueue(wq);
2597 }
2598 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2599 wq = nfslocaliod_workqueue;
2600 if (wq != NULL) {
2601 nfslocaliod_workqueue = NULL;
2602 destroy_workqueue(wq);
2603 }
2604 #endif /* CONFIG_NFS_LOCALIO */
2605 }
2606
2607 /*
2608 * Start the nfsiod workqueues
2609 */
nfsiod_start(void)2610 static int nfsiod_start(void)
2611 {
2612 dprintk("RPC: creating workqueue nfsiod\n");
2613 nfsiod_workqueue = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2614 if (nfsiod_workqueue == NULL)
2615 return -ENOMEM;
2616 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
2617 /*
2618 * localio writes need to use a normal (non-memreclaim) workqueue.
2619 * When we start getting low on space, XFS goes and calls flush_work() on
2620 * a non-memreclaim work queue, which causes a priority inversion problem.
2621 */
2622 dprintk("RPC: creating workqueue nfslocaliod\n");
2623 nfslocaliod_workqueue = alloc_workqueue("nfslocaliod", WQ_UNBOUND, 0);
2624 if (unlikely(nfslocaliod_workqueue == NULL)) {
2625 nfsiod_stop();
2626 return -ENOMEM;
2627 }
2628 #endif /* CONFIG_NFS_LOCALIO */
2629 return 0;
2630 }
2631
2632 unsigned int nfs_net_id;
2633 EXPORT_SYMBOL_GPL(nfs_net_id);
2634
nfs_net_init(struct net * net)2635 static int nfs_net_init(struct net *net)
2636 {
2637 struct nfs_net *nn = net_generic(net, nfs_net_id);
2638 int err;
2639
2640 nfs_clients_init(net);
2641
2642 if (!rpc_proc_register(net, &nn->rpcstats)) {
2643 err = -ENOMEM;
2644 goto err_proc_rpc;
2645 }
2646
2647 err = nfs_fs_proc_net_init(net);
2648 if (err)
2649 goto err_proc_nfs;
2650
2651 return 0;
2652
2653 err_proc_nfs:
2654 rpc_proc_unregister(net, "nfs");
2655 err_proc_rpc:
2656 nfs_clients_exit(net);
2657 return err;
2658 }
2659
nfs_net_exit(struct net * net)2660 static void nfs_net_exit(struct net *net)
2661 {
2662 rpc_proc_unregister(net, "nfs");
2663 nfs_fs_proc_net_exit(net);
2664 nfs_clients_exit(net);
2665 }
2666
2667 static struct pernet_operations nfs_net_ops = {
2668 .init = nfs_net_init,
2669 .exit = nfs_net_exit,
2670 .id = &nfs_net_id,
2671 .size = sizeof(struct nfs_net),
2672 };
2673
2674 #ifdef CONFIG_KEYS
2675 static struct key *nfs_keyring;
2676
nfs_init_keyring(void)2677 static int __init nfs_init_keyring(void)
2678 {
2679 nfs_keyring = keyring_alloc(".nfs",
2680 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
2681 current_cred(),
2682 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
2683 (KEY_USR_ALL & ~KEY_USR_SETATTR),
2684 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
2685 return PTR_ERR_OR_ZERO(nfs_keyring);
2686 }
2687
nfs_exit_keyring(void)2688 static void nfs_exit_keyring(void)
2689 {
2690 key_put(nfs_keyring);
2691 }
2692 #else
nfs_init_keyring(void)2693 static inline int nfs_init_keyring(void)
2694 {
2695 return 0;
2696 }
2697
nfs_exit_keyring(void)2698 static inline void nfs_exit_keyring(void)
2699 {
2700 }
2701 #endif /* CONFIG_KEYS */
2702
2703 /*
2704 * Initialize NFS
2705 */
init_nfs_fs(void)2706 static int __init init_nfs_fs(void)
2707 {
2708 int err;
2709
2710 err = nfs_init_keyring();
2711 if (err)
2712 return err;
2713
2714 err = nfs_sysfs_init();
2715 if (err < 0)
2716 goto out10;
2717
2718 err = register_pernet_subsys(&nfs_net_ops);
2719 if (err < 0)
2720 goto out9;
2721
2722 err = nfsiod_start();
2723 if (err)
2724 goto out7;
2725
2726 err = nfs_fs_proc_init();
2727 if (err)
2728 goto out6;
2729
2730 err = nfs_init_nfspagecache();
2731 if (err)
2732 goto out5;
2733
2734 err = nfs_init_inodecache();
2735 if (err)
2736 goto out4;
2737
2738 err = nfs_init_readpagecache();
2739 if (err)
2740 goto out3;
2741
2742 err = nfs_init_writepagecache();
2743 if (err)
2744 goto out2;
2745
2746 err = nfs_init_directcache();
2747 if (err)
2748 goto out1;
2749
2750 err = register_nfs_fs();
2751 if (err)
2752 goto out0;
2753
2754 return 0;
2755 out0:
2756 nfs_destroy_directcache();
2757 out1:
2758 nfs_destroy_writepagecache();
2759 out2:
2760 nfs_destroy_readpagecache();
2761 out3:
2762 nfs_destroy_inodecache();
2763 out4:
2764 nfs_destroy_nfspagecache();
2765 out5:
2766 nfs_fs_proc_exit();
2767 out6:
2768 nfsiod_stop();
2769 out7:
2770 unregister_pernet_subsys(&nfs_net_ops);
2771 out9:
2772 nfs_sysfs_exit();
2773 out10:
2774 nfs_exit_keyring();
2775 return err;
2776 }
2777
exit_nfs_fs(void)2778 static void __exit exit_nfs_fs(void)
2779 {
2780 nfs_destroy_directcache();
2781 nfs_destroy_writepagecache();
2782 nfs_destroy_readpagecache();
2783 nfs_destroy_inodecache();
2784 nfs_destroy_nfspagecache();
2785 unregister_pernet_subsys(&nfs_net_ops);
2786 unregister_nfs_fs();
2787 nfs_fs_proc_exit();
2788 nfsiod_stop();
2789 nfs_sysfs_exit();
2790 nfs_exit_keyring();
2791 }
2792
2793 /* Not quite true; I just maintain it */
2794 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2795 MODULE_DESCRIPTION("NFS client support");
2796 MODULE_LICENSE("GPL");
2797 module_param(enable_ino64, bool, 0644);
2798
2799 module_init(init_nfs_fs)
2800 module_exit(exit_nfs_fs)
2801