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spi: efm32: Convert to use GPIO descriptors
[linux/fpc-iii.git] / fs / nfs / inode.c
blob11bf15800ac9974204491ab0f7570ca063dbddfb
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 void nfs_invalidate_inode(struct inode *);
66 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
67
68 static struct kmem_cache * nfs_inode_cachep;
69
70 static inline unsigned long
71 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
72 {
73 return nfs_fileid_to_ino_t(fattr->fileid);
74 }
75
76 static int nfs_wait_killable(int mode)
77 {
78 freezable_schedule_unsafe();
79 if (signal_pending_state(mode, current))
80 return -ERESTARTSYS;
81 return 0;
82 }
83
84 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
85 {
86 return nfs_wait_killable(mode);
87 }
88 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
89
90 /**
91 * nfs_compat_user_ino64 - returns the user-visible inode number
92 * @fileid: 64-bit fileid
93 *
94 * This function returns a 32-bit inode number if the boot parameter
95 * nfs.enable_ino64 is zero.
96 */
97 u64 nfs_compat_user_ino64(u64 fileid)
98 {
99 #ifdef CONFIG_COMPAT
100 compat_ulong_t ino;
101 #else
102 unsigned long ino;
103 #endif
104
105 if (enable_ino64)
106 return fileid;
107 ino = fileid;
108 if (sizeof(ino) < sizeof(fileid))
109 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
110 return ino;
111 }
112
113 int nfs_drop_inode(struct inode *inode)
114 {
115 return NFS_STALE(inode) || generic_drop_inode(inode);
116 }
117 EXPORT_SYMBOL_GPL(nfs_drop_inode);
118
119 void nfs_clear_inode(struct inode *inode)
120 {
121 /*
122 * The following should never happen...
123 */
124 WARN_ON_ONCE(nfs_have_writebacks(inode));
125 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
126 nfs_zap_acl_cache(inode);
127 nfs_access_zap_cache(inode);
128 nfs_fscache_clear_inode(inode);
129 }
130 EXPORT_SYMBOL_GPL(nfs_clear_inode);
131
132 void nfs_evict_inode(struct inode *inode)
133 {
134 truncate_inode_pages_final(&inode->i_data);
135 clear_inode(inode);
136 nfs_clear_inode(inode);
137 }
138
139 int nfs_sync_inode(struct inode *inode)
140 {
141 inode_dio_wait(inode);
142 return nfs_wb_all(inode);
143 }
144 EXPORT_SYMBOL_GPL(nfs_sync_inode);
145
146 /**
147 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
148 * @mapping: pointer to struct address_space
149 */
150 int nfs_sync_mapping(struct address_space *mapping)
151 {
152 int ret = 0;
153
154 if (mapping->nrpages != 0) {
155 unmap_mapping_range(mapping, 0, 0, 0);
156 ret = nfs_wb_all(mapping->host);
157 }
158 return ret;
159 }
160
161 static int nfs_attribute_timeout(struct inode *inode)
162 {
163 struct nfs_inode *nfsi = NFS_I(inode);
164
165 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
166 }
167
168 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
169 {
170 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
171
172 /* Special case for the pagecache or access cache */
173 if (flags == NFS_INO_REVAL_PAGECACHE &&
174 !(cache_validity & NFS_INO_REVAL_FORCED))
175 return false;
176 return (cache_validity & flags) != 0;
177 }
178
179 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
180 {
181 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
182
183 if ((cache_validity & flags) != 0)
184 return true;
185 if (nfs_attribute_timeout(inode))
186 return true;
187 return false;
188 }
189
190 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
191 {
192 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
193 return nfs_check_cache_invalid_delegated(inode, flags);
194
195 return nfs_check_cache_invalid_not_delegated(inode, flags);
196 }
197
198 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
199 {
200 struct nfs_inode *nfsi = NFS_I(inode);
201 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
202
203 if (have_delegation) {
204 if (!(flags & NFS_INO_REVAL_FORCED))
205 flags &= ~NFS_INO_INVALID_OTHER;
206 flags &= ~(NFS_INO_INVALID_CHANGE
207 | NFS_INO_INVALID_SIZE
208 | NFS_INO_REVAL_PAGECACHE);
209 }
210
211 if (inode->i_mapping->nrpages == 0)
212 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
213 nfsi->cache_validity |= flags;
214 if (flags & NFS_INO_INVALID_DATA)
215 nfs_fscache_invalidate(inode);
216 }
217
218 /*
219 * Invalidate the local caches
220 */
221 static void nfs_zap_caches_locked(struct inode *inode)
222 {
223 struct nfs_inode *nfsi = NFS_I(inode);
224 int mode = inode->i_mode;
225
226 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
227
228 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
229 nfsi->attrtimeo_timestamp = jiffies;
230
231 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
232 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
233 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
234 | NFS_INO_INVALID_DATA
235 | NFS_INO_INVALID_ACCESS
236 | NFS_INO_INVALID_ACL
237 | NFS_INO_REVAL_PAGECACHE);
238 } else
239 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
240 | NFS_INO_INVALID_ACCESS
241 | NFS_INO_INVALID_ACL
242 | NFS_INO_REVAL_PAGECACHE);
243 nfs_zap_label_cache_locked(nfsi);
244 }
245
246 void nfs_zap_caches(struct inode *inode)
247 {
248 spin_lock(&inode->i_lock);
249 nfs_zap_caches_locked(inode);
250 spin_unlock(&inode->i_lock);
251 }
252
253 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
254 {
255 if (mapping->nrpages != 0) {
256 spin_lock(&inode->i_lock);
257 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
258 spin_unlock(&inode->i_lock);
259 }
260 }
261
262 void nfs_zap_acl_cache(struct inode *inode)
263 {
264 void (*clear_acl_cache)(struct inode *);
265
266 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
267 if (clear_acl_cache != NULL)
268 clear_acl_cache(inode);
269 spin_lock(&inode->i_lock);
270 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
271 spin_unlock(&inode->i_lock);
272 }
273 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
274
275 void nfs_invalidate_atime(struct inode *inode)
276 {
277 spin_lock(&inode->i_lock);
278 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
279 spin_unlock(&inode->i_lock);
280 }
281 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
282
283 /*
284 * Invalidate, but do not unhash, the inode.
285 * NB: must be called with inode->i_lock held!
286 */
287 static void nfs_invalidate_inode(struct inode *inode)
288 {
289 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
290 nfs_zap_caches_locked(inode);
291 }
292
293 struct nfs_find_desc {
294 struct nfs_fh *fh;
295 struct nfs_fattr *fattr;
296 };
297
298 /*
299 * In NFSv3 we can have 64bit inode numbers. In order to support
300 * this, and re-exported directories (also seen in NFSv2)
301 * we are forced to allow 2 different inodes to have the same
302 * i_ino.
303 */
304 static int
305 nfs_find_actor(struct inode *inode, void *opaque)
306 {
307 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
308 struct nfs_fh *fh = desc->fh;
309 struct nfs_fattr *fattr = desc->fattr;
310
311 if (NFS_FILEID(inode) != fattr->fileid)
312 return 0;
313 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
314 return 0;
315 if (nfs_compare_fh(NFS_FH(inode), fh))
316 return 0;
317 if (is_bad_inode(inode) || NFS_STALE(inode))
318 return 0;
319 return 1;
320 }
321
322 static int
323 nfs_init_locked(struct inode *inode, void *opaque)
324 {
325 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
326 struct nfs_fattr *fattr = desc->fattr;
327
328 set_nfs_fileid(inode, fattr->fileid);
329 inode->i_mode = fattr->mode;
330 nfs_copy_fh(NFS_FH(inode), desc->fh);
331 return 0;
332 }
333
334 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
335 static void nfs_clear_label_invalid(struct inode *inode)
336 {
337 spin_lock(&inode->i_lock);
338 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
339 spin_unlock(&inode->i_lock);
340 }
341
342 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
343 struct nfs4_label *label)
344 {
345 int error;
346
347 if (label == NULL)
348 return;
349
350 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
351 error = security_inode_notifysecctx(inode, label->label,
352 label->len);
353 if (error)
354 printk(KERN_ERR "%s() %s %d "
355 "security_inode_notifysecctx() %d\n",
356 __func__,
357 (char *)label->label,
358 label->len, error);
359 nfs_clear_label_invalid(inode);
360 }
361 }
362
363 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
364 {
365 struct nfs4_label *label = NULL;
366 int minor_version = server->nfs_client->cl_minorversion;
367
368 if (minor_version < 2)
369 return label;
370
371 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
372 return label;
373
374 label = kzalloc(sizeof(struct nfs4_label), flags);
375 if (label == NULL)
376 return ERR_PTR(-ENOMEM);
377
378 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
379 if (label->label == NULL) {
380 kfree(label);
381 return ERR_PTR(-ENOMEM);
382 }
383 label->len = NFS4_MAXLABELLEN;
384
385 return label;
386 }
387 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
388 #else
389 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
390 struct nfs4_label *label)
391 {
392 }
393 #endif
394 EXPORT_SYMBOL_GPL(nfs_setsecurity);
395
396 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
397 struct inode *
398 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
399 {
400 struct nfs_find_desc desc = {
401 .fh = fh,
402 .fattr = fattr,
403 };
404 struct inode *inode;
405 unsigned long hash;
406
407 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
408 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
409 return NULL;
410
411 hash = nfs_fattr_to_ino_t(fattr);
412 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
413
414 dprintk("%s: returning %p\n", __func__, inode);
415 return inode;
416 }
417
418 /*
419 * This is our front-end to iget that looks up inodes by file handle
420 * instead of inode number.
421 */
422 struct inode *
423 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
424 {
425 struct nfs_find_desc desc = {
426 .fh = fh,
427 .fattr = fattr
428 };
429 struct inode *inode = ERR_PTR(-ENOENT);
430 unsigned long hash;
431
432 nfs_attr_check_mountpoint(sb, fattr);
433
434 if (nfs_attr_use_mounted_on_fileid(fattr))
435 fattr->fileid = fattr->mounted_on_fileid;
436 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
437 goto out_no_inode;
438 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
439 goto out_no_inode;
440
441 hash = nfs_fattr_to_ino_t(fattr);
442
443 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
444 if (inode == NULL) {
445 inode = ERR_PTR(-ENOMEM);
446 goto out_no_inode;
447 }
448
449 if (inode->i_state & I_NEW) {
450 struct nfs_inode *nfsi = NFS_I(inode);
451 unsigned long now = jiffies;
452
453 /* We set i_ino for the few things that still rely on it,
454 * such as stat(2) */
455 inode->i_ino = hash;
456
457 /* We can't support update_atime(), since the server will reset it */
458 inode->i_flags |= S_NOATIME|S_NOCMTIME;
459 inode->i_mode = fattr->mode;
460 nfsi->cache_validity = 0;
461 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
462 && nfs_server_capable(inode, NFS_CAP_MODE))
463 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
464 /* Why so? Because we want revalidate for devices/FIFOs, and
465 * that's precisely what we have in nfs_file_inode_operations.
466 */
467 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
468 if (S_ISREG(inode->i_mode)) {
469 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
470 inode->i_data.a_ops = &nfs_file_aops;
471 } else if (S_ISDIR(inode->i_mode)) {
472 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
473 inode->i_fop = &nfs_dir_operations;
474 inode->i_data.a_ops = &nfs_dir_aops;
475 /* Deal with crossing mountpoints */
476 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
477 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
478 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
479 inode->i_op = &nfs_referral_inode_operations;
480 else
481 inode->i_op = &nfs_mountpoint_inode_operations;
482 inode->i_fop = NULL;
483 inode->i_flags |= S_AUTOMOUNT;
484 }
485 } else if (S_ISLNK(inode->i_mode)) {
486 inode->i_op = &nfs_symlink_inode_operations;
487 inode_nohighmem(inode);
488 } else
489 init_special_inode(inode, inode->i_mode, fattr->rdev);
490
491 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
492 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
493 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
494 inode_set_iversion_raw(inode, 0);
495 inode->i_size = 0;
496 clear_nlink(inode);
497 inode->i_uid = make_kuid(&init_user_ns, -2);
498 inode->i_gid = make_kgid(&init_user_ns, -2);
499 inode->i_blocks = 0;
500 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
501 nfsi->write_io = 0;
502 nfsi->read_io = 0;
503
504 nfsi->read_cache_jiffies = fattr->time_start;
505 nfsi->attr_gencount = fattr->gencount;
506 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
507 inode->i_atime = fattr->atime;
508 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
510 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
511 inode->i_mtime = fattr->mtime;
512 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
513 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
514 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
515 inode->i_ctime = fattr->ctime;
516 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
517 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
518 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
519 inode_set_iversion_raw(inode, fattr->change_attr);
520 else
521 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
522 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
523 inode->i_size = nfs_size_to_loff_t(fattr->size);
524 else
525 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
526 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
527 set_nlink(inode, fattr->nlink);
528 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
529 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
530 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
531 inode->i_uid = fattr->uid;
532 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
533 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
534 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
535 inode->i_gid = fattr->gid;
536 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
537 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
538 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
539 inode->i_blocks = fattr->du.nfs2.blocks;
540 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
541 /*
542 * report the blocks in 512byte units
543 */
544 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
545 }
546
547 if (nfsi->cache_validity != 0)
548 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
549
550 nfs_setsecurity(inode, fattr, label);
551
552 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
553 nfsi->attrtimeo_timestamp = now;
554 nfsi->access_cache = RB_ROOT;
555
556 nfs_fscache_init_inode(inode);
557
558 unlock_new_inode(inode);
559 } else {
560 int err = nfs_refresh_inode(inode, fattr);
561 if (err < 0) {
562 iput(inode);
563 inode = ERR_PTR(err);
564 goto out_no_inode;
565 }
566 }
567 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
568 inode->i_sb->s_id,
569 (unsigned long long)NFS_FILEID(inode),
570 nfs_display_fhandle_hash(fh),
571 atomic_read(&inode->i_count));
572
573 out:
574 return inode;
575
576 out_no_inode:
577 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
578 goto out;
579 }
580 EXPORT_SYMBOL_GPL(nfs_fhget);
581
582 #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)
583
584 int
585 nfs_setattr(struct dentry *dentry, struct iattr *attr)
586 {
587 struct inode *inode = d_inode(dentry);
588 struct nfs_fattr *fattr;
589 int error = 0;
590
591 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
592
593 /* skip mode change if it's just for clearing setuid/setgid */
594 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
595 attr->ia_valid &= ~ATTR_MODE;
596
597 if (attr->ia_valid & ATTR_SIZE) {
598 BUG_ON(!S_ISREG(inode->i_mode));
599
600 error = inode_newsize_ok(inode, attr->ia_size);
601 if (error)
602 return error;
603
604 if (attr->ia_size == i_size_read(inode))
605 attr->ia_valid &= ~ATTR_SIZE;
606 }
607
608 /* Optimization: if the end result is no change, don't RPC */
609 attr->ia_valid &= NFS_VALID_ATTRS;
610 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
611 return 0;
612
613 trace_nfs_setattr_enter(inode);
614
615 /* Write all dirty data */
616 if (S_ISREG(inode->i_mode))
617 nfs_sync_inode(inode);
618
619 fattr = nfs_alloc_fattr();
620 if (fattr == NULL) {
621 error = -ENOMEM;
622 goto out;
623 }
624
625 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
626 if (error == 0)
627 error = nfs_refresh_inode(inode, fattr);
628 nfs_free_fattr(fattr);
629 out:
630 trace_nfs_setattr_exit(inode, error);
631 return error;
632 }
633 EXPORT_SYMBOL_GPL(nfs_setattr);
634
635 /**
636 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
637 * @inode: inode of the file used
638 * @offset: file offset to start truncating
639 *
640 * This is a copy of the common vmtruncate, but with the locking
641 * corrected to take into account the fact that NFS requires
642 * inode->i_size to be updated under the inode->i_lock.
643 * Note: must be called with inode->i_lock held!
644 */
645 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
646 {
647 int err;
648
649 err = inode_newsize_ok(inode, offset);
650 if (err)
651 goto out;
652
653 i_size_write(inode, offset);
654 /* Optimisation */
655 if (offset == 0)
656 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
657 NFS_INO_DATA_INVAL_DEFER);
658 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
659
660 spin_unlock(&inode->i_lock);
661 truncate_pagecache(inode, offset);
662 spin_lock(&inode->i_lock);
663 out:
664 return err;
665 }
666
667 /**
668 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
669 * @inode: pointer to struct inode
670 * @attr: pointer to struct iattr
671 * @fattr: pointer to struct nfs_fattr
672 *
673 * Note: we do this in the *proc.c in order to ensure that
674 * it works for things like exclusive creates too.
675 */
676 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
677 struct nfs_fattr *fattr)
678 {
679 /* Barrier: bump the attribute generation count. */
680 nfs_fattr_set_barrier(fattr);
681
682 spin_lock(&inode->i_lock);
683 NFS_I(inode)->attr_gencount = fattr->gencount;
684 if ((attr->ia_valid & ATTR_SIZE) != 0) {
685 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
686 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
687 nfs_vmtruncate(inode, attr->ia_size);
688 }
689 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
690 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
691 if ((attr->ia_valid & ATTR_MODE) != 0) {
692 int mode = attr->ia_mode & S_IALLUGO;
693 mode |= inode->i_mode & ~S_IALLUGO;
694 inode->i_mode = mode;
695 }
696 if ((attr->ia_valid & ATTR_UID) != 0)
697 inode->i_uid = attr->ia_uid;
698 if ((attr->ia_valid & ATTR_GID) != 0)
699 inode->i_gid = attr->ia_gid;
700 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
701 inode->i_ctime = fattr->ctime;
702 else
703 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
704 | NFS_INO_INVALID_CTIME);
705 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
706 | NFS_INO_INVALID_ACL);
707 }
708 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
709 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
710 | NFS_INO_INVALID_CTIME);
711 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
712 inode->i_atime = fattr->atime;
713 else if (attr->ia_valid & ATTR_ATIME_SET)
714 inode->i_atime = attr->ia_atime;
715 else
716 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
717
718 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
719 inode->i_ctime = fattr->ctime;
720 else
721 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
722 | NFS_INO_INVALID_CTIME);
723 }
724 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
725 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
726 | NFS_INO_INVALID_CTIME);
727 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
728 inode->i_mtime = fattr->mtime;
729 else if (attr->ia_valid & ATTR_MTIME_SET)
730 inode->i_mtime = attr->ia_mtime;
731 else
732 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
733
734 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
735 inode->i_ctime = fattr->ctime;
736 else
737 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
738 | NFS_INO_INVALID_CTIME);
739 }
740 if (fattr->valid)
741 nfs_update_inode(inode, fattr);
742 spin_unlock(&inode->i_lock);
743 }
744 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
745
746 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
747 {
748 struct dentry *parent;
749
750 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
751 return;
752 parent = dget_parent(dentry);
753 nfs_force_use_readdirplus(d_inode(parent));
754 dput(parent);
755 }
756
757 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
758 {
759 struct dentry *parent;
760
761 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
762 return;
763 parent = dget_parent(dentry);
764 nfs_advise_use_readdirplus(d_inode(parent));
765 dput(parent);
766 }
767
768 static bool nfs_need_revalidate_inode(struct inode *inode)
769 {
770 if (NFS_I(inode)->cache_validity &
771 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
772 return true;
773 if (nfs_attribute_cache_expired(inode))
774 return true;
775 return false;
776 }
777
778 int nfs_getattr(const struct path *path, struct kstat *stat,
779 u32 request_mask, unsigned int query_flags)
780 {
781 struct inode *inode = d_inode(path->dentry);
782 struct nfs_server *server = NFS_SERVER(inode);
783 unsigned long cache_validity;
784 int err = 0;
785 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
786 bool do_update = false;
787
788 trace_nfs_getattr_enter(inode);
789
790 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
791 goto out_no_update;
792
793 /* Flush out writes to the server in order to update c/mtime. */
794 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
795 S_ISREG(inode->i_mode)) {
796 err = filemap_write_and_wait(inode->i_mapping);
797 if (err)
798 goto out;
799 }
800
801 /*
802 * We may force a getattr if the user cares about atime.
803 *
804 * Note that we only have to check the vfsmount flags here:
805 * - NFS always sets S_NOATIME by so checking it would give a
806 * bogus result
807 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
808 * no point in checking those.
809 */
810 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
811 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
812 request_mask &= ~STATX_ATIME;
813
814 /* Is the user requesting attributes that might need revalidation? */
815 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
816 STATX_MTIME|STATX_UID|STATX_GID|
817 STATX_SIZE|STATX_BLOCKS)))
818 goto out_no_revalidate;
819
820 /* Check whether the cached attributes are stale */
821 do_update |= force_sync || nfs_attribute_cache_expired(inode);
822 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
823 do_update |= cache_validity &
824 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
825 if (request_mask & STATX_ATIME)
826 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
827 if (request_mask & (STATX_CTIME|STATX_MTIME))
828 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
829 if (do_update) {
830 /* Update the attribute cache */
831 if (!(server->flags & NFS_MOUNT_NOAC))
832 nfs_readdirplus_parent_cache_miss(path->dentry);
833 else
834 nfs_readdirplus_parent_cache_hit(path->dentry);
835 err = __nfs_revalidate_inode(server, inode);
836 if (err)
837 goto out;
838 } else
839 nfs_readdirplus_parent_cache_hit(path->dentry);
840 out_no_revalidate:
841 /* Only return attributes that were revalidated. */
842 stat->result_mask &= request_mask;
843 out_no_update:
844 generic_fillattr(inode, stat);
845 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
846 if (S_ISDIR(inode->i_mode))
847 stat->blksize = NFS_SERVER(inode)->dtsize;
848 out:
849 trace_nfs_getattr_exit(inode, err);
850 return err;
851 }
852 EXPORT_SYMBOL_GPL(nfs_getattr);
853
854 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
855 {
856 refcount_set(&l_ctx->count, 1);
857 l_ctx->lockowner = current->files;
858 INIT_LIST_HEAD(&l_ctx->list);
859 atomic_set(&l_ctx->io_count, 0);
860 }
861
862 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
863 {
864 struct nfs_lock_context *pos;
865
866 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
867 if (pos->lockowner != current->files)
868 continue;
869 if (refcount_inc_not_zero(&pos->count))
870 return pos;
871 }
872 return NULL;
873 }
874
875 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
876 {
877 struct nfs_lock_context *res, *new = NULL;
878 struct inode *inode = d_inode(ctx->dentry);
879
880 rcu_read_lock();
881 res = __nfs_find_lock_context(ctx);
882 rcu_read_unlock();
883 if (res == NULL) {
884 new = kmalloc(sizeof(*new), GFP_KERNEL);
885 if (new == NULL)
886 return ERR_PTR(-ENOMEM);
887 nfs_init_lock_context(new);
888 spin_lock(&inode->i_lock);
889 res = __nfs_find_lock_context(ctx);
890 if (res == NULL) {
891 new->open_context = get_nfs_open_context(ctx);
892 if (new->open_context) {
893 list_add_tail_rcu(&new->list,
894 &ctx->lock_context.list);
895 res = new;
896 new = NULL;
897 } else
898 res = ERR_PTR(-EBADF);
899 }
900 spin_unlock(&inode->i_lock);
901 kfree(new);
902 }
903 return res;
904 }
905 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
906
907 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
908 {
909 struct nfs_open_context *ctx = l_ctx->open_context;
910 struct inode *inode = d_inode(ctx->dentry);
911
912 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
913 return;
914 list_del_rcu(&l_ctx->list);
915 spin_unlock(&inode->i_lock);
916 put_nfs_open_context(ctx);
917 kfree_rcu(l_ctx, rcu_head);
918 }
919 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
920
921 /**
922 * nfs_close_context - Common close_context() routine NFSv2/v3
923 * @ctx: pointer to context
924 * @is_sync: is this a synchronous close
925 *
926 * Ensure that the attributes are up to date if we're mounted
927 * with close-to-open semantics and we have cached data that will
928 * need to be revalidated on open.
929 */
930 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
931 {
932 struct nfs_inode *nfsi;
933 struct inode *inode;
934 struct nfs_server *server;
935
936 if (!(ctx->mode & FMODE_WRITE))
937 return;
938 if (!is_sync)
939 return;
940 inode = d_inode(ctx->dentry);
941 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
942 return;
943 nfsi = NFS_I(inode);
944 if (inode->i_mapping->nrpages == 0)
945 return;
946 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
947 return;
948 if (!list_empty(&nfsi->open_files))
949 return;
950 server = NFS_SERVER(inode);
951 if (server->flags & NFS_MOUNT_NOCTO)
952 return;
953 nfs_revalidate_inode(server, inode);
954 }
955 EXPORT_SYMBOL_GPL(nfs_close_context);
956
957 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
958 fmode_t f_mode,
959 struct file *filp)
960 {
961 struct nfs_open_context *ctx;
962 const struct cred *cred = get_current_cred();
963
964 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
965 if (!ctx) {
966 put_cred(cred);
967 return ERR_PTR(-ENOMEM);
968 }
969 nfs_sb_active(dentry->d_sb);
970 ctx->dentry = dget(dentry);
971 ctx->cred = cred;
972 ctx->ll_cred = NULL;
973 ctx->state = NULL;
974 ctx->mode = f_mode;
975 ctx->flags = 0;
976 ctx->error = 0;
977 ctx->flock_owner = (fl_owner_t)filp;
978 nfs_init_lock_context(&ctx->lock_context);
979 ctx->lock_context.open_context = ctx;
980 INIT_LIST_HEAD(&ctx->list);
981 ctx->mdsthreshold = NULL;
982 return ctx;
983 }
984 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
985
986 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
987 {
988 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
989 return ctx;
990 return NULL;
991 }
992 EXPORT_SYMBOL_GPL(get_nfs_open_context);
993
994 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
995 {
996 struct inode *inode = d_inode(ctx->dentry);
997 struct super_block *sb = ctx->dentry->d_sb;
998
999 if (!refcount_dec_and_test(&ctx->lock_context.count))
1000 return;
1001 if (!list_empty(&ctx->list)) {
1002 spin_lock(&inode->i_lock);
1003 list_del_rcu(&ctx->list);
1004 spin_unlock(&inode->i_lock);
1005 }
1006 if (inode != NULL)
1007 NFS_PROTO(inode)->close_context(ctx, is_sync);
1008 put_cred(ctx->cred);
1009 dput(ctx->dentry);
1010 nfs_sb_deactive(sb);
1011 put_rpccred(ctx->ll_cred);
1012 kfree(ctx->mdsthreshold);
1013 kfree_rcu(ctx, rcu_head);
1014 }
1015
1016 void put_nfs_open_context(struct nfs_open_context *ctx)
1017 {
1018 __put_nfs_open_context(ctx, 0);
1019 }
1020 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1021
1022 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1023 {
1024 __put_nfs_open_context(ctx, 1);
1025 }
1026
1027 /*
1028 * Ensure that mmap has a recent RPC credential for use when writing out
1029 * shared pages
1030 */
1031 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1032 {
1033 struct inode *inode = d_inode(ctx->dentry);
1034 struct nfs_inode *nfsi = NFS_I(inode);
1035
1036 spin_lock(&inode->i_lock);
1037 if (list_empty(&nfsi->open_files) &&
1038 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1039 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1040 NFS_INO_REVAL_FORCED;
1041 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1042 spin_unlock(&inode->i_lock);
1043 }
1044 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1045
1046 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1047 {
1048 filp->private_data = get_nfs_open_context(ctx);
1049 if (list_empty(&ctx->list))
1050 nfs_inode_attach_open_context(ctx);
1051 }
1052 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1053
1054 /*
1055 * Given an inode, search for an open context with the desired characteristics
1056 */
1057 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1058 {
1059 struct nfs_inode *nfsi = NFS_I(inode);
1060 struct nfs_open_context *pos, *ctx = NULL;
1061
1062 rcu_read_lock();
1063 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1064 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1065 continue;
1066 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1067 continue;
1068 ctx = get_nfs_open_context(pos);
1069 if (ctx)
1070 break;
1071 }
1072 rcu_read_unlock();
1073 return ctx;
1074 }
1075
1076 void nfs_file_clear_open_context(struct file *filp)
1077 {
1078 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1079
1080 if (ctx) {
1081 struct inode *inode = d_inode(ctx->dentry);
1082
1083 /*
1084 * We fatal error on write before. Try to writeback
1085 * every page again.
1086 */
1087 if (ctx->error < 0)
1088 invalidate_inode_pages2(inode->i_mapping);
1089 filp->private_data = NULL;
1090 put_nfs_open_context_sync(ctx);
1091 }
1092 }
1093
1094 /*
1095 * These allocate and release file read/write context information.
1096 */
1097 int nfs_open(struct inode *inode, struct file *filp)
1098 {
1099 struct nfs_open_context *ctx;
1100
1101 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1102 if (IS_ERR(ctx))
1103 return PTR_ERR(ctx);
1104 nfs_file_set_open_context(filp, ctx);
1105 put_nfs_open_context(ctx);
1106 nfs_fscache_open_file(inode, filp);
1107 return 0;
1108 }
1109 EXPORT_SYMBOL_GPL(nfs_open);
1110
1111 /*
1112 * This function is called whenever some part of NFS notices that
1113 * the cached attributes have to be refreshed.
1114 */
1115 int
1116 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1117 {
1118 int status = -ESTALE;
1119 struct nfs4_label *label = NULL;
1120 struct nfs_fattr *fattr = NULL;
1121 struct nfs_inode *nfsi = NFS_I(inode);
1122
1123 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1124 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1125
1126 trace_nfs_revalidate_inode_enter(inode);
1127
1128 if (is_bad_inode(inode))
1129 goto out;
1130 if (NFS_STALE(inode))
1131 goto out;
1132
1133 /* pNFS: Attributes aren't updated until we layoutcommit */
1134 if (S_ISREG(inode->i_mode)) {
1135 status = pnfs_sync_inode(inode, false);
1136 if (status)
1137 goto out;
1138 }
1139
1140 status = -ENOMEM;
1141 fattr = nfs_alloc_fattr();
1142 if (fattr == NULL)
1143 goto out;
1144
1145 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1146
1147 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1148 if (IS_ERR(label)) {
1149 status = PTR_ERR(label);
1150 goto out;
1151 }
1152
1153 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1154 label, inode);
1155 if (status != 0) {
1156 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1157 inode->i_sb->s_id,
1158 (unsigned long long)NFS_FILEID(inode), status);
1159 switch (status) {
1160 case -ETIMEDOUT:
1161 /* A soft timeout occurred. Use cached information? */
1162 if (server->flags & NFS_MOUNT_SOFTREVAL)
1163 status = 0;
1164 break;
1165 case -ESTALE:
1166 nfs_zap_caches(inode);
1167 if (!S_ISDIR(inode->i_mode))
1168 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1169 }
1170 goto err_out;
1171 }
1172
1173 status = nfs_refresh_inode(inode, fattr);
1174 if (status) {
1175 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1176 inode->i_sb->s_id,
1177 (unsigned long long)NFS_FILEID(inode), status);
1178 goto err_out;
1179 }
1180
1181 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1182 nfs_zap_acl_cache(inode);
1183
1184 nfs_setsecurity(inode, fattr, label);
1185
1186 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1187 inode->i_sb->s_id,
1188 (unsigned long long)NFS_FILEID(inode));
1189
1190 err_out:
1191 nfs4_label_free(label);
1192 out:
1193 nfs_free_fattr(fattr);
1194 trace_nfs_revalidate_inode_exit(inode, status);
1195 return status;
1196 }
1197
1198 int nfs_attribute_cache_expired(struct inode *inode)
1199 {
1200 if (nfs_have_delegated_attributes(inode))
1201 return 0;
1202 return nfs_attribute_timeout(inode);
1203 }
1204
1205 /**
1206 * nfs_revalidate_inode - Revalidate the inode attributes
1207 * @server: pointer to nfs_server struct
1208 * @inode: pointer to inode struct
1209 *
1210 * Updates inode attribute information by retrieving the data from the server.
1211 */
1212 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1213 {
1214 if (!nfs_need_revalidate_inode(inode))
1215 return NFS_STALE(inode) ? -ESTALE : 0;
1216 return __nfs_revalidate_inode(server, inode);
1217 }
1218 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1219
1220 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1221 {
1222 struct nfs_inode *nfsi = NFS_I(inode);
1223 int ret;
1224
1225 if (mapping->nrpages != 0) {
1226 if (S_ISREG(inode->i_mode)) {
1227 ret = nfs_sync_mapping(mapping);
1228 if (ret < 0)
1229 return ret;
1230 }
1231 ret = invalidate_inode_pages2(mapping);
1232 if (ret < 0)
1233 return ret;
1234 }
1235 if (S_ISDIR(inode->i_mode)) {
1236 spin_lock(&inode->i_lock);
1237 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1238 spin_unlock(&inode->i_lock);
1239 }
1240 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1241 nfs_fscache_wait_on_invalidate(inode);
1242
1243 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1244 inode->i_sb->s_id,
1245 (unsigned long long)NFS_FILEID(inode));
1246 return 0;
1247 }
1248
1249 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1250 {
1251 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1252 NFS_STALE(inode);
1253 }
1254
1255 int nfs_revalidate_mapping_rcu(struct inode *inode)
1256 {
1257 struct nfs_inode *nfsi = NFS_I(inode);
1258 unsigned long *bitlock = &nfsi->flags;
1259 int ret = 0;
1260
1261 if (IS_SWAPFILE(inode))
1262 goto out;
1263 if (nfs_mapping_need_revalidate_inode(inode)) {
1264 ret = -ECHILD;
1265 goto out;
1266 }
1267 spin_lock(&inode->i_lock);
1268 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1269 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1270 ret = -ECHILD;
1271 spin_unlock(&inode->i_lock);
1272 out:
1273 return ret;
1274 }
1275
1276 /**
1277 * nfs_revalidate_mapping - Revalidate the pagecache
1278 * @inode: pointer to host inode
1279 * @mapping: pointer to mapping
1280 */
1281 int nfs_revalidate_mapping(struct inode *inode,
1282 struct address_space *mapping)
1283 {
1284 struct nfs_inode *nfsi = NFS_I(inode);
1285 unsigned long *bitlock = &nfsi->flags;
1286 int ret = 0;
1287
1288 /* swapfiles are not supposed to be shared. */
1289 if (IS_SWAPFILE(inode))
1290 goto out;
1291
1292 if (nfs_mapping_need_revalidate_inode(inode)) {
1293 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1294 if (ret < 0)
1295 goto out;
1296 }
1297
1298 /*
1299 * We must clear NFS_INO_INVALID_DATA first to ensure that
1300 * invalidations that come in while we're shooting down the mappings
1301 * are respected. But, that leaves a race window where one revalidator
1302 * can clear the flag, and then another checks it before the mapping
1303 * gets invalidated. Fix that by serializing access to this part of
1304 * the function.
1305 *
1306 * At the same time, we need to allow other tasks to see whether we
1307 * might be in the middle of invalidating the pages, so we only set
1308 * the bit lock here if it looks like we're going to be doing that.
1309 */
1310 for (;;) {
1311 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1312 nfs_wait_bit_killable, TASK_KILLABLE);
1313 if (ret)
1314 goto out;
1315 spin_lock(&inode->i_lock);
1316 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1317 spin_unlock(&inode->i_lock);
1318 continue;
1319 }
1320 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1321 break;
1322 spin_unlock(&inode->i_lock);
1323 goto out;
1324 }
1325
1326 set_bit(NFS_INO_INVALIDATING, bitlock);
1327 smp_wmb();
1328 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1329 NFS_INO_DATA_INVAL_DEFER);
1330 spin_unlock(&inode->i_lock);
1331 trace_nfs_invalidate_mapping_enter(inode);
1332 ret = nfs_invalidate_mapping(inode, mapping);
1333 trace_nfs_invalidate_mapping_exit(inode, ret);
1334
1335 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1336 smp_mb__after_atomic();
1337 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1338 out:
1339 return ret;
1340 }
1341
1342 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1343 {
1344 struct inode *inode = &nfsi->vfs_inode;
1345
1346 if (!S_ISREG(inode->i_mode))
1347 return false;
1348 if (list_empty(&nfsi->open_files))
1349 return false;
1350 return inode_is_open_for_write(inode);
1351 }
1352
1353 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1354 {
1355 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1356 }
1357
1358 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1359 {
1360 struct timespec64 ts;
1361
1362 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1363 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1364 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1365 inode_set_iversion_raw(inode, fattr->change_attr);
1366 if (S_ISDIR(inode->i_mode))
1367 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1368 }
1369 /* If we have atomic WCC data, we may update some attributes */
1370 ts = inode->i_ctime;
1371 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1372 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1373 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1374 inode->i_ctime = fattr->ctime;
1375 }
1376
1377 ts = inode->i_mtime;
1378 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1379 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1380 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1381 inode->i_mtime = fattr->mtime;
1382 if (S_ISDIR(inode->i_mode))
1383 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1384 }
1385 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1386 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1387 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1388 && !nfs_have_writebacks(inode)) {
1389 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1390 }
1391 }
1392
1393 /**
1394 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1395 * @inode: pointer to inode
1396 * @fattr: updated attributes
1397 *
1398 * Verifies the attribute cache. If we have just changed the attributes,
1399 * so that fattr carries weak cache consistency data, then it may
1400 * also update the ctime/mtime/change_attribute.
1401 */
1402 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1403 {
1404 struct nfs_inode *nfsi = NFS_I(inode);
1405 loff_t cur_size, new_isize;
1406 unsigned long invalid = 0;
1407 struct timespec64 ts;
1408
1409 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1410 return 0;
1411
1412 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1413 /* Only a mounted-on-fileid? Just exit */
1414 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1415 return 0;
1416 /* Has the inode gone and changed behind our back? */
1417 } else if (nfsi->fileid != fattr->fileid) {
1418 /* Is this perhaps the mounted-on fileid? */
1419 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1420 nfsi->fileid == fattr->mounted_on_fileid)
1421 return 0;
1422 return -ESTALE;
1423 }
1424 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1425 return -ESTALE;
1426
1427
1428 if (!nfs_file_has_buffered_writers(nfsi)) {
1429 /* Verify a few of the more important attributes */
1430 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1431 invalid |= NFS_INO_INVALID_CHANGE
1432 | NFS_INO_REVAL_PAGECACHE;
1433
1434 ts = inode->i_mtime;
1435 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1436 invalid |= NFS_INO_INVALID_MTIME;
1437
1438 ts = inode->i_ctime;
1439 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1440 invalid |= NFS_INO_INVALID_CTIME;
1441
1442 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1443 cur_size = i_size_read(inode);
1444 new_isize = nfs_size_to_loff_t(fattr->size);
1445 if (cur_size != new_isize)
1446 invalid |= NFS_INO_INVALID_SIZE
1447 | NFS_INO_REVAL_PAGECACHE;
1448 }
1449 }
1450
1451 /* Have any file permissions changed? */
1452 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1453 invalid |= NFS_INO_INVALID_ACCESS
1454 | NFS_INO_INVALID_ACL
1455 | NFS_INO_INVALID_OTHER;
1456 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1457 invalid |= NFS_INO_INVALID_ACCESS
1458 | NFS_INO_INVALID_ACL
1459 | NFS_INO_INVALID_OTHER;
1460 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1461 invalid |= NFS_INO_INVALID_ACCESS
1462 | NFS_INO_INVALID_ACL
1463 | NFS_INO_INVALID_OTHER;
1464
1465 /* Has the link count changed? */
1466 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1467 invalid |= NFS_INO_INVALID_OTHER;
1468
1469 ts = inode->i_atime;
1470 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1471 invalid |= NFS_INO_INVALID_ATIME;
1472
1473 if (invalid != 0)
1474 nfs_set_cache_invalid(inode, invalid);
1475
1476 nfsi->read_cache_jiffies = fattr->time_start;
1477 return 0;
1478 }
1479
1480 static atomic_long_t nfs_attr_generation_counter;
1481
1482 static unsigned long nfs_read_attr_generation_counter(void)
1483 {
1484 return atomic_long_read(&nfs_attr_generation_counter);
1485 }
1486
1487 unsigned long nfs_inc_attr_generation_counter(void)
1488 {
1489 return atomic_long_inc_return(&nfs_attr_generation_counter);
1490 }
1491 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1492
1493 void nfs_fattr_init(struct nfs_fattr *fattr)
1494 {
1495 fattr->valid = 0;
1496 fattr->time_start = jiffies;
1497 fattr->gencount = nfs_inc_attr_generation_counter();
1498 fattr->owner_name = NULL;
1499 fattr->group_name = NULL;
1500 }
1501 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1502
1503 /**
1504 * nfs_fattr_set_barrier
1505 * @fattr: attributes
1506 *
1507 * Used to set a barrier after an attribute was updated. This
1508 * barrier ensures that older attributes from RPC calls that may
1509 * have raced with our update cannot clobber these new values.
1510 * Note that you are still responsible for ensuring that other
1511 * operations which change the attribute on the server do not
1512 * collide.
1513 */
1514 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1515 {
1516 fattr->gencount = nfs_inc_attr_generation_counter();
1517 }
1518
1519 struct nfs_fattr *nfs_alloc_fattr(void)
1520 {
1521 struct nfs_fattr *fattr;
1522
1523 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1524 if (fattr != NULL)
1525 nfs_fattr_init(fattr);
1526 return fattr;
1527 }
1528 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1529
1530 struct nfs_fh *nfs_alloc_fhandle(void)
1531 {
1532 struct nfs_fh *fh;
1533
1534 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1535 if (fh != NULL)
1536 fh->size = 0;
1537 return fh;
1538 }
1539 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1540
1541 #ifdef NFS_DEBUG
1542 /*
1543 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1544 * in the same way that wireshark does
1545 *
1546 * @fh: file handle
1547 *
1548 * For debugging only.
1549 */
1550 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1551 {
1552 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1553 * not on the result */
1554 return nfs_fhandle_hash(fh);
1555 }
1556 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1557
1558 /*
1559 * _nfs_display_fhandle - display an NFS file handle on the console
1560 *
1561 * @fh: file handle to display
1562 * @caption: display caption
1563 *
1564 * For debugging only.
1565 */
1566 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1567 {
1568 unsigned short i;
1569
1570 if (fh == NULL || fh->size == 0) {
1571 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1572 return;
1573 }
1574
1575 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1576 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1577 for (i = 0; i < fh->size; i += 16) {
1578 __be32 *pos = (__be32 *)&fh->data[i];
1579
1580 switch ((fh->size - i - 1) >> 2) {
1581 case 0:
1582 printk(KERN_DEFAULT " %08x\n",
1583 be32_to_cpup(pos));
1584 break;
1585 case 1:
1586 printk(KERN_DEFAULT " %08x %08x\n",
1587 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1588 break;
1589 case 2:
1590 printk(KERN_DEFAULT " %08x %08x %08x\n",
1591 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1592 be32_to_cpup(pos + 2));
1593 break;
1594 default:
1595 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1596 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1597 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1598 }
1599 }
1600 }
1601 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1602 #endif
1603
1604 /**
1605 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1606 * @inode: pointer to inode
1607 * @fattr: attributes
1608 *
1609 * Attempt to divine whether or not an RPC call reply carrying stale
1610 * attributes got scheduled after another call carrying updated ones.
1611 *
1612 * To do so, the function first assumes that a more recent ctime means
1613 * that the attributes in fattr are newer, however it also attempt to
1614 * catch the case where ctime either didn't change, or went backwards
1615 * (if someone reset the clock on the server) by looking at whether
1616 * or not this RPC call was started after the inode was last updated.
1617 * Note also the check for wraparound of 'attr_gencount'
1618 *
1619 * The function returns 'true' if it thinks the attributes in 'fattr' are
1620 * more recent than the ones cached in the inode.
1621 *
1622 */
1623 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1624 {
1625 const struct nfs_inode *nfsi = NFS_I(inode);
1626
1627 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1628 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1629 }
1630
1631 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1632 {
1633 int ret;
1634
1635 trace_nfs_refresh_inode_enter(inode);
1636
1637 if (nfs_inode_attrs_need_update(inode, fattr))
1638 ret = nfs_update_inode(inode, fattr);
1639 else
1640 ret = nfs_check_inode_attributes(inode, fattr);
1641
1642 trace_nfs_refresh_inode_exit(inode, ret);
1643 return ret;
1644 }
1645
1646 /**
1647 * nfs_refresh_inode - try to update the inode attribute cache
1648 * @inode: pointer to inode
1649 * @fattr: updated attributes
1650 *
1651 * Check that an RPC call that returned attributes has not overlapped with
1652 * other recent updates of the inode metadata, then decide whether it is
1653 * safe to do a full update of the inode attributes, or whether just to
1654 * call nfs_check_inode_attributes.
1655 */
1656 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1657 {
1658 int status;
1659
1660 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1661 return 0;
1662 spin_lock(&inode->i_lock);
1663 status = nfs_refresh_inode_locked(inode, fattr);
1664 spin_unlock(&inode->i_lock);
1665
1666 return status;
1667 }
1668 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1669
1670 static int nfs_post_op_update_inode_locked(struct inode *inode,
1671 struct nfs_fattr *fattr, unsigned int invalid)
1672 {
1673 if (S_ISDIR(inode->i_mode))
1674 invalid |= NFS_INO_INVALID_DATA;
1675 nfs_set_cache_invalid(inode, invalid);
1676 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1677 return 0;
1678 return nfs_refresh_inode_locked(inode, fattr);
1679 }
1680
1681 /**
1682 * nfs_post_op_update_inode - try to update the inode attribute cache
1683 * @inode: pointer to inode
1684 * @fattr: updated attributes
1685 *
1686 * After an operation that has changed the inode metadata, mark the
1687 * attribute cache as being invalid, then try to update it.
1688 *
1689 * NB: if the server didn't return any post op attributes, this
1690 * function will force the retrieval of attributes before the next
1691 * NFS request. Thus it should be used only for operations that
1692 * are expected to change one or more attributes, to avoid
1693 * unnecessary NFS requests and trips through nfs_update_inode().
1694 */
1695 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1696 {
1697 int status;
1698
1699 spin_lock(&inode->i_lock);
1700 nfs_fattr_set_barrier(fattr);
1701 status = nfs_post_op_update_inode_locked(inode, fattr,
1702 NFS_INO_INVALID_CHANGE
1703 | NFS_INO_INVALID_CTIME
1704 | NFS_INO_REVAL_FORCED);
1705 spin_unlock(&inode->i_lock);
1706
1707 return status;
1708 }
1709 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1710
1711 /**
1712 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1713 * @inode: pointer to inode
1714 * @fattr: updated attributes
1715 *
1716 * After an operation that has changed the inode metadata, mark the
1717 * attribute cache as being invalid, then try to update it. Fake up
1718 * weak cache consistency data, if none exist.
1719 *
1720 * This function is mainly designed to be used by the ->write_done() functions.
1721 */
1722 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1723 {
1724 int status;
1725
1726 /* Don't do a WCC update if these attributes are already stale */
1727 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1728 !nfs_inode_attrs_need_update(inode, fattr)) {
1729 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1730 | NFS_ATTR_FATTR_PRESIZE
1731 | NFS_ATTR_FATTR_PREMTIME
1732 | NFS_ATTR_FATTR_PRECTIME);
1733 goto out_noforce;
1734 }
1735 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1736 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1737 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1738 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1739 }
1740 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1741 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1742 fattr->pre_ctime = inode->i_ctime;
1743 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1744 }
1745 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1746 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1747 fattr->pre_mtime = inode->i_mtime;
1748 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1749 }
1750 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1751 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1752 fattr->pre_size = i_size_read(inode);
1753 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1754 }
1755 out_noforce:
1756 status = nfs_post_op_update_inode_locked(inode, fattr,
1757 NFS_INO_INVALID_CHANGE
1758 | NFS_INO_INVALID_CTIME
1759 | NFS_INO_INVALID_MTIME);
1760 return status;
1761 }
1762
1763 /**
1764 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1765 * @inode: pointer to inode
1766 * @fattr: updated attributes
1767 *
1768 * After an operation that has changed the inode metadata, mark the
1769 * attribute cache as being invalid, then try to update it. Fake up
1770 * weak cache consistency data, if none exist.
1771 *
1772 * This function is mainly designed to be used by the ->write_done() functions.
1773 */
1774 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1775 {
1776 int status;
1777
1778 spin_lock(&inode->i_lock);
1779 nfs_fattr_set_barrier(fattr);
1780 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1781 spin_unlock(&inode->i_lock);
1782 return status;
1783 }
1784 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1785
1786
1787 /*
1788 * Many nfs protocol calls return the new file attributes after
1789 * an operation. Here we update the inode to reflect the state
1790 * of the server's inode.
1791 *
1792 * This is a bit tricky because we have to make sure all dirty pages
1793 * have been sent off to the server before calling invalidate_inode_pages.
1794 * To make sure no other process adds more write requests while we try
1795 * our best to flush them, we make them sleep during the attribute refresh.
1796 *
1797 * A very similar scenario holds for the dir cache.
1798 */
1799 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1800 {
1801 struct nfs_server *server;
1802 struct nfs_inode *nfsi = NFS_I(inode);
1803 loff_t cur_isize, new_isize;
1804 unsigned long invalid = 0;
1805 unsigned long now = jiffies;
1806 unsigned long save_cache_validity;
1807 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1808 bool cache_revalidated = true;
1809 bool attr_changed = false;
1810 bool have_delegation;
1811
1812 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1813 __func__, inode->i_sb->s_id, inode->i_ino,
1814 nfs_display_fhandle_hash(NFS_FH(inode)),
1815 atomic_read(&inode->i_count), fattr->valid);
1816
1817 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1818 /* Only a mounted-on-fileid? Just exit */
1819 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1820 return 0;
1821 /* Has the inode gone and changed behind our back? */
1822 } else if (nfsi->fileid != fattr->fileid) {
1823 /* Is this perhaps the mounted-on fileid? */
1824 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1825 nfsi->fileid == fattr->mounted_on_fileid)
1826 return 0;
1827 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1828 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1829 NFS_SERVER(inode)->nfs_client->cl_hostname,
1830 inode->i_sb->s_id, (long long)nfsi->fileid,
1831 (long long)fattr->fileid);
1832 goto out_err;
1833 }
1834
1835 /*
1836 * Make sure the inode's type hasn't changed.
1837 */
1838 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1839 /*
1840 * Big trouble! The inode has become a different object.
1841 */
1842 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1843 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1844 goto out_err;
1845 }
1846
1847 server = NFS_SERVER(inode);
1848 /* Update the fsid? */
1849 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1850 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1851 !IS_AUTOMOUNT(inode))
1852 server->fsid = fattr->fsid;
1853
1854 /* Save the delegation state before clearing cache_validity */
1855 have_delegation = nfs_have_delegated_attributes(inode);
1856
1857 /*
1858 * Update the read time so we don't revalidate too often.
1859 */
1860 nfsi->read_cache_jiffies = fattr->time_start;
1861
1862 save_cache_validity = nfsi->cache_validity;
1863 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1864 | NFS_INO_INVALID_ATIME
1865 | NFS_INO_REVAL_FORCED
1866 | NFS_INO_REVAL_PAGECACHE);
1867
1868 /* Do atomic weak cache consistency updates */
1869 nfs_wcc_update_inode(inode, fattr);
1870
1871 if (pnfs_layoutcommit_outstanding(inode)) {
1872 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1873 cache_revalidated = false;
1874 }
1875
1876 /* More cache consistency checks */
1877 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1878 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1879 /* Could it be a race with writeback? */
1880 if (!(have_writers || have_delegation)) {
1881 invalid |= NFS_INO_INVALID_DATA
1882 | NFS_INO_INVALID_ACCESS
1883 | NFS_INO_INVALID_ACL;
1884 /* Force revalidate of all attributes */
1885 save_cache_validity |= NFS_INO_INVALID_CTIME
1886 | NFS_INO_INVALID_MTIME
1887 | NFS_INO_INVALID_SIZE
1888 | NFS_INO_INVALID_OTHER;
1889 if (S_ISDIR(inode->i_mode))
1890 nfs_force_lookup_revalidate(inode);
1891 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1892 inode->i_sb->s_id,
1893 inode->i_ino);
1894 } else if (!have_delegation)
1895 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1896 inode_set_iversion_raw(inode, fattr->change_attr);
1897 attr_changed = true;
1898 }
1899 } else {
1900 nfsi->cache_validity |= save_cache_validity &
1901 (NFS_INO_INVALID_CHANGE
1902 | NFS_INO_REVAL_PAGECACHE
1903 | NFS_INO_REVAL_FORCED);
1904 cache_revalidated = false;
1905 }
1906
1907 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1908 inode->i_mtime = fattr->mtime;
1909 } else if (server->caps & NFS_CAP_MTIME) {
1910 nfsi->cache_validity |= save_cache_validity &
1911 (NFS_INO_INVALID_MTIME
1912 | NFS_INO_REVAL_FORCED);
1913 cache_revalidated = false;
1914 }
1915
1916 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1917 inode->i_ctime = fattr->ctime;
1918 } else if (server->caps & NFS_CAP_CTIME) {
1919 nfsi->cache_validity |= save_cache_validity &
1920 (NFS_INO_INVALID_CTIME
1921 | NFS_INO_REVAL_FORCED);
1922 cache_revalidated = false;
1923 }
1924
1925 /* Check if our cached file size is stale */
1926 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1927 new_isize = nfs_size_to_loff_t(fattr->size);
1928 cur_isize = i_size_read(inode);
1929 if (new_isize != cur_isize && !have_delegation) {
1930 /* Do we perhaps have any outstanding writes, or has
1931 * the file grown beyond our last write? */
1932 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1933 i_size_write(inode, new_isize);
1934 if (!have_writers)
1935 invalid |= NFS_INO_INVALID_DATA;
1936 attr_changed = true;
1937 }
1938 dprintk("NFS: isize change on server for file %s/%ld "
1939 "(%Ld to %Ld)\n",
1940 inode->i_sb->s_id,
1941 inode->i_ino,
1942 (long long)cur_isize,
1943 (long long)new_isize);
1944 }
1945 } else {
1946 nfsi->cache_validity |= save_cache_validity &
1947 (NFS_INO_INVALID_SIZE
1948 | NFS_INO_REVAL_PAGECACHE
1949 | NFS_INO_REVAL_FORCED);
1950 cache_revalidated = false;
1951 }
1952
1953
1954 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1955 inode->i_atime = fattr->atime;
1956 else if (server->caps & NFS_CAP_ATIME) {
1957 nfsi->cache_validity |= save_cache_validity &
1958 (NFS_INO_INVALID_ATIME
1959 | NFS_INO_REVAL_FORCED);
1960 cache_revalidated = false;
1961 }
1962
1963 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1964 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1965 umode_t newmode = inode->i_mode & S_IFMT;
1966 newmode |= fattr->mode & S_IALLUGO;
1967 inode->i_mode = newmode;
1968 invalid |= NFS_INO_INVALID_ACCESS
1969 | NFS_INO_INVALID_ACL;
1970 attr_changed = true;
1971 }
1972 } else if (server->caps & NFS_CAP_MODE) {
1973 nfsi->cache_validity |= save_cache_validity &
1974 (NFS_INO_INVALID_OTHER
1975 | NFS_INO_REVAL_FORCED);
1976 cache_revalidated = false;
1977 }
1978
1979 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1980 if (!uid_eq(inode->i_uid, fattr->uid)) {
1981 invalid |= NFS_INO_INVALID_ACCESS
1982 | NFS_INO_INVALID_ACL;
1983 inode->i_uid = fattr->uid;
1984 attr_changed = true;
1985 }
1986 } else if (server->caps & NFS_CAP_OWNER) {
1987 nfsi->cache_validity |= save_cache_validity &
1988 (NFS_INO_INVALID_OTHER
1989 | NFS_INO_REVAL_FORCED);
1990 cache_revalidated = false;
1991 }
1992
1993 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1994 if (!gid_eq(inode->i_gid, fattr->gid)) {
1995 invalid |= NFS_INO_INVALID_ACCESS
1996 | NFS_INO_INVALID_ACL;
1997 inode->i_gid = fattr->gid;
1998 attr_changed = true;
1999 }
2000 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
2001 nfsi->cache_validity |= save_cache_validity &
2002 (NFS_INO_INVALID_OTHER
2003 | NFS_INO_REVAL_FORCED);
2004 cache_revalidated = false;
2005 }
2006
2007 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2008 if (inode->i_nlink != fattr->nlink) {
2009 if (S_ISDIR(inode->i_mode))
2010 invalid |= NFS_INO_INVALID_DATA;
2011 set_nlink(inode, fattr->nlink);
2012 attr_changed = true;
2013 }
2014 } else if (server->caps & NFS_CAP_NLINK) {
2015 nfsi->cache_validity |= save_cache_validity &
2016 (NFS_INO_INVALID_OTHER
2017 | NFS_INO_REVAL_FORCED);
2018 cache_revalidated = false;
2019 }
2020
2021 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2022 /*
2023 * report the blocks in 512byte units
2024 */
2025 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2026 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2027 inode->i_blocks = fattr->du.nfs2.blocks;
2028 else
2029 cache_revalidated = false;
2030
2031 /* Update attrtimeo value if we're out of the unstable period */
2032 if (attr_changed) {
2033 invalid &= ~NFS_INO_INVALID_ATTR;
2034 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2035 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2036 nfsi->attrtimeo_timestamp = now;
2037 /* Set barrier to be more recent than all outstanding updates */
2038 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2039 } else {
2040 if (cache_revalidated) {
2041 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2042 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2043 nfsi->attrtimeo <<= 1;
2044 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2045 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2046 }
2047 nfsi->attrtimeo_timestamp = now;
2048 }
2049 /* Set the barrier to be more recent than this fattr */
2050 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2051 nfsi->attr_gencount = fattr->gencount;
2052 }
2053
2054 /* Don't invalidate the data if we were to blame */
2055 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2056 || S_ISLNK(inode->i_mode)))
2057 invalid &= ~NFS_INO_INVALID_DATA;
2058 nfs_set_cache_invalid(inode, invalid);
2059
2060 return 0;
2061 out_err:
2062 /*
2063 * No need to worry about unhashing the dentry, as the
2064 * lookup validation will know that the inode is bad.
2065 * (But we fall through to invalidate the caches.)
2066 */
2067 nfs_invalidate_inode(inode);
2068 return -ESTALE;
2069 }
2070
2071 struct inode *nfs_alloc_inode(struct super_block *sb)
2072 {
2073 struct nfs_inode *nfsi;
2074 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2075 if (!nfsi)
2076 return NULL;
2077 nfsi->flags = 0UL;
2078 nfsi->cache_validity = 0UL;
2079 #if IS_ENABLED(CONFIG_NFS_V4)
2080 nfsi->nfs4_acl = NULL;
2081 #endif /* CONFIG_NFS_V4 */
2082 return &nfsi->vfs_inode;
2083 }
2084 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2085
2086 void nfs_free_inode(struct inode *inode)
2087 {
2088 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2089 }
2090 EXPORT_SYMBOL_GPL(nfs_free_inode);
2091
2092 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2093 {
2094 #if IS_ENABLED(CONFIG_NFS_V4)
2095 INIT_LIST_HEAD(&nfsi->open_states);
2096 nfsi->delegation = NULL;
2097 init_rwsem(&nfsi->rwsem);
2098 nfsi->layout = NULL;
2099 #endif
2100 }
2101
2102 static void init_once(void *foo)
2103 {
2104 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2105
2106 inode_init_once(&nfsi->vfs_inode);
2107 INIT_LIST_HEAD(&nfsi->open_files);
2108 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2109 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2110 INIT_LIST_HEAD(&nfsi->commit_info.list);
2111 atomic_long_set(&nfsi->nrequests, 0);
2112 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2113 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2114 init_rwsem(&nfsi->rmdir_sem);
2115 mutex_init(&nfsi->commit_mutex);
2116 nfs4_init_once(nfsi);
2117 nfsi->cache_change_attribute = 0;
2118 }
2119
2120 static int __init nfs_init_inodecache(void)
2121 {
2122 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2123 sizeof(struct nfs_inode),
2124 0, (SLAB_RECLAIM_ACCOUNT|
2125 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2126 init_once);
2127 if (nfs_inode_cachep == NULL)
2128 return -ENOMEM;
2129
2130 return 0;
2131 }
2132
2133 static void nfs_destroy_inodecache(void)
2134 {
2135 /*
2136 * Make sure all delayed rcu free inodes are flushed before we
2137 * destroy cache.
2138 */
2139 rcu_barrier();
2140 kmem_cache_destroy(nfs_inode_cachep);
2141 }
2142
2143 struct workqueue_struct *nfsiod_workqueue;
2144 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2145
2146 /*
2147 * start up the nfsiod workqueue
2148 */
2149 static int nfsiod_start(void)
2150 {
2151 struct workqueue_struct *wq;
2152 dprintk("RPC: creating workqueue nfsiod\n");
2153 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2154 if (wq == NULL)
2155 return -ENOMEM;
2156 nfsiod_workqueue = wq;
2157 return 0;
2158 }
2159
2160 /*
2161 * Destroy the nfsiod workqueue
2162 */
2163 static void nfsiod_stop(void)
2164 {
2165 struct workqueue_struct *wq;
2166
2167 wq = nfsiod_workqueue;
2168 if (wq == NULL)
2169 return;
2170 nfsiod_workqueue = NULL;
2171 destroy_workqueue(wq);
2172 }
2173
2174 unsigned int nfs_net_id;
2175 EXPORT_SYMBOL_GPL(nfs_net_id);
2176
2177 static int nfs_net_init(struct net *net)
2178 {
2179 nfs_clients_init(net);
2180 return nfs_fs_proc_net_init(net);
2181 }
2182
2183 static void nfs_net_exit(struct net *net)
2184 {
2185 nfs_fs_proc_net_exit(net);
2186 nfs_clients_exit(net);
2187 }
2188
2189 static struct pernet_operations nfs_net_ops = {
2190 .init = nfs_net_init,
2191 .exit = nfs_net_exit,
2192 .id = &nfs_net_id,
2193 .size = sizeof(struct nfs_net),
2194 };
2195
2196 /*
2197 * Initialize NFS
2198 */
2199 static int __init init_nfs_fs(void)
2200 {
2201 int err;
2202
2203 err = nfs_sysfs_init();
2204 if (err < 0)
2205 goto out10;
2206
2207 err = register_pernet_subsys(&nfs_net_ops);
2208 if (err < 0)
2209 goto out9;
2210
2211 err = nfs_fscache_register();
2212 if (err < 0)
2213 goto out8;
2214
2215 err = nfsiod_start();
2216 if (err)
2217 goto out7;
2218
2219 err = nfs_fs_proc_init();
2220 if (err)
2221 goto out6;
2222
2223 err = nfs_init_nfspagecache();
2224 if (err)
2225 goto out5;
2226
2227 err = nfs_init_inodecache();
2228 if (err)
2229 goto out4;
2230
2231 err = nfs_init_readpagecache();
2232 if (err)
2233 goto out3;
2234
2235 err = nfs_init_writepagecache();
2236 if (err)
2237 goto out2;
2238
2239 err = nfs_init_directcache();
2240 if (err)
2241 goto out1;
2242
2243 rpc_proc_register(&init_net, &nfs_rpcstat);
2244
2245 err = register_nfs_fs();
2246 if (err)
2247 goto out0;
2248
2249 return 0;
2250 out0:
2251 rpc_proc_unregister(&init_net, "nfs");
2252 nfs_destroy_directcache();
2253 out1:
2254 nfs_destroy_writepagecache();
2255 out2:
2256 nfs_destroy_readpagecache();
2257 out3:
2258 nfs_destroy_inodecache();
2259 out4:
2260 nfs_destroy_nfspagecache();
2261 out5:
2262 nfs_fs_proc_exit();
2263 out6:
2264 nfsiod_stop();
2265 out7:
2266 nfs_fscache_unregister();
2267 out8:
2268 unregister_pernet_subsys(&nfs_net_ops);
2269 out9:
2270 nfs_sysfs_exit();
2271 out10:
2272 return err;
2273 }
2274
2275 static void __exit exit_nfs_fs(void)
2276 {
2277 nfs_destroy_directcache();
2278 nfs_destroy_writepagecache();
2279 nfs_destroy_readpagecache();
2280 nfs_destroy_inodecache();
2281 nfs_destroy_nfspagecache();
2282 nfs_fscache_unregister();
2283 unregister_pernet_subsys(&nfs_net_ops);
2284 rpc_proc_unregister(&init_net, "nfs");
2285 unregister_nfs_fs();
2286 nfs_fs_proc_exit();
2287 nfsiod_stop();
2288 nfs_sysfs_exit();
2289 }
2290
2291 /* Not quite true; I just maintain it */
2292 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2293 MODULE_LICENSE("GPL");
2294 module_param(enable_ino64, bool, 0644);
2295
2296 module_init(init_nfs_fs)
2297 module_exit(exit_nfs_fs)
Linux with added FPC-III support