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netfilter: nft_set_rbtree: fix panic when destroying set by GC
[linux/fpc-iii.git] / fs / nfs / inode.c
blobb65aee481d131d00734c057cd16f4532f2898211
1 /*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sched/signal.h>
19 #include <linux/time.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38 #include <linux/slab.h>
39 #include <linux/compat.h>
40 #include <linux/freezer.h>
41 #include <linux/uaccess.h>
42 #include <linux/iversion.h>
43
44 #include "nfs4_fs.h"
45 #include "callback.h"
46 #include "delegation.h"
47 #include "iostat.h"
48 #include "internal.h"
49 #include "fscache.h"
50 #include "pnfs.h"
51 #include "nfs.h"
52 #include "netns.h"
53
54 #include "nfstrace.h"
55
56 #define NFSDBG_FACILITY NFSDBG_VFS
57
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
62
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
65
66 static struct kmem_cache * nfs_inode_cachep;
67
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
70 {
71 return nfs_fileid_to_ino_t(fattr->fileid);
72 }
73
74 static int nfs_wait_killable(int mode)
75 {
76 freezable_schedule_unsafe();
77 if (signal_pending_state(mode, current))
78 return -ERESTARTSYS;
79 return 0;
80 }
81
82 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
83 {
84 return nfs_wait_killable(mode);
85 }
86 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
87
88 /**
89 * nfs_compat_user_ino64 - returns the user-visible inode number
90 * @fileid: 64-bit fileid
91 *
92 * This function returns a 32-bit inode number if the boot parameter
93 * nfs.enable_ino64 is zero.
94 */
95 u64 nfs_compat_user_ino64(u64 fileid)
96 {
97 #ifdef CONFIG_COMPAT
98 compat_ulong_t ino;
99 #else
100 unsigned long ino;
101 #endif
102
103 if (enable_ino64)
104 return fileid;
105 ino = fileid;
106 if (sizeof(ino) < sizeof(fileid))
107 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
108 return ino;
109 }
110
111 int nfs_drop_inode(struct inode *inode)
112 {
113 return NFS_STALE(inode) || generic_drop_inode(inode);
114 }
115 EXPORT_SYMBOL_GPL(nfs_drop_inode);
116
117 void nfs_clear_inode(struct inode *inode)
118 {
119 /*
120 * The following should never happen...
121 */
122 WARN_ON_ONCE(nfs_have_writebacks(inode));
123 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
124 nfs_zap_acl_cache(inode);
125 nfs_access_zap_cache(inode);
126 nfs_fscache_clear_inode(inode);
127 }
128 EXPORT_SYMBOL_GPL(nfs_clear_inode);
129
130 void nfs_evict_inode(struct inode *inode)
131 {
132 truncate_inode_pages_final(&inode->i_data);
133 clear_inode(inode);
134 nfs_clear_inode(inode);
135 }
136
137 int nfs_sync_inode(struct inode *inode)
138 {
139 inode_dio_wait(inode);
140 return nfs_wb_all(inode);
141 }
142 EXPORT_SYMBOL_GPL(nfs_sync_inode);
143
144 /**
145 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
146 */
147 int nfs_sync_mapping(struct address_space *mapping)
148 {
149 int ret = 0;
150
151 if (mapping->nrpages != 0) {
152 unmap_mapping_range(mapping, 0, 0, 0);
153 ret = nfs_wb_all(mapping->host);
154 }
155 return ret;
156 }
157
158 static int nfs_attribute_timeout(struct inode *inode)
159 {
160 struct nfs_inode *nfsi = NFS_I(inode);
161
162 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
163 }
164
165 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
166 {
167 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
168
169 /* Special case for the pagecache or access cache */
170 if (flags == NFS_INO_REVAL_PAGECACHE &&
171 !(cache_validity & NFS_INO_REVAL_FORCED))
172 return false;
173 return (cache_validity & flags) != 0;
174 }
175
176 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
177 {
178 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
179
180 if ((cache_validity & flags) != 0)
181 return true;
182 if (nfs_attribute_timeout(inode))
183 return true;
184 return false;
185 }
186
187 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
188 {
189 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
190 return nfs_check_cache_invalid_delegated(inode, flags);
191
192 return nfs_check_cache_invalid_not_delegated(inode, flags);
193 }
194
195 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
196 {
197 struct nfs_inode *nfsi = NFS_I(inode);
198 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
199
200 if (have_delegation) {
201 if (!(flags & NFS_INO_REVAL_FORCED))
202 flags &= ~NFS_INO_INVALID_OTHER;
203 flags &= ~(NFS_INO_INVALID_CHANGE
204 | NFS_INO_INVALID_SIZE
205 | NFS_INO_REVAL_PAGECACHE);
206 }
207
208 if (inode->i_mapping->nrpages == 0)
209 flags &= ~NFS_INO_INVALID_DATA;
210 nfsi->cache_validity |= flags;
211 if (flags & NFS_INO_INVALID_DATA)
212 nfs_fscache_invalidate(inode);
213 }
214
215 /*
216 * Invalidate the local caches
217 */
218 static void nfs_zap_caches_locked(struct inode *inode)
219 {
220 struct nfs_inode *nfsi = NFS_I(inode);
221 int mode = inode->i_mode;
222
223 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
224
225 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
226 nfsi->attrtimeo_timestamp = jiffies;
227
228 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
229 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
230 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
231 | NFS_INO_INVALID_DATA
232 | NFS_INO_INVALID_ACCESS
233 | NFS_INO_INVALID_ACL
234 | NFS_INO_REVAL_PAGECACHE);
235 } else
236 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
237 | NFS_INO_INVALID_ACCESS
238 | NFS_INO_INVALID_ACL
239 | NFS_INO_REVAL_PAGECACHE);
240 nfs_zap_label_cache_locked(nfsi);
241 }
242
243 void nfs_zap_caches(struct inode *inode)
244 {
245 spin_lock(&inode->i_lock);
246 nfs_zap_caches_locked(inode);
247 spin_unlock(&inode->i_lock);
248 }
249
250 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
251 {
252 if (mapping->nrpages != 0) {
253 spin_lock(&inode->i_lock);
254 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
255 spin_unlock(&inode->i_lock);
256 }
257 }
258
259 void nfs_zap_acl_cache(struct inode *inode)
260 {
261 void (*clear_acl_cache)(struct inode *);
262
263 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
264 if (clear_acl_cache != NULL)
265 clear_acl_cache(inode);
266 spin_lock(&inode->i_lock);
267 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
268 spin_unlock(&inode->i_lock);
269 }
270 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
271
272 void nfs_invalidate_atime(struct inode *inode)
273 {
274 spin_lock(&inode->i_lock);
275 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
276 spin_unlock(&inode->i_lock);
277 }
278 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
279
280 /*
281 * Invalidate, but do not unhash, the inode.
282 * NB: must be called with inode->i_lock held!
283 */
284 static void nfs_invalidate_inode(struct inode *inode)
285 {
286 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
287 nfs_zap_caches_locked(inode);
288 }
289
290 struct nfs_find_desc {
291 struct nfs_fh *fh;
292 struct nfs_fattr *fattr;
293 };
294
295 /*
296 * In NFSv3 we can have 64bit inode numbers. In order to support
297 * this, and re-exported directories (also seen in NFSv2)
298 * we are forced to allow 2 different inodes to have the same
299 * i_ino.
300 */
301 static int
302 nfs_find_actor(struct inode *inode, void *opaque)
303 {
304 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
305 struct nfs_fh *fh = desc->fh;
306 struct nfs_fattr *fattr = desc->fattr;
307
308 if (NFS_FILEID(inode) != fattr->fileid)
309 return 0;
310 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
311 return 0;
312 if (nfs_compare_fh(NFS_FH(inode), fh))
313 return 0;
314 if (is_bad_inode(inode) || NFS_STALE(inode))
315 return 0;
316 return 1;
317 }
318
319 static int
320 nfs_init_locked(struct inode *inode, void *opaque)
321 {
322 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
323 struct nfs_fattr *fattr = desc->fattr;
324
325 set_nfs_fileid(inode, fattr->fileid);
326 inode->i_mode = fattr->mode;
327 nfs_copy_fh(NFS_FH(inode), desc->fh);
328 return 0;
329 }
330
331 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
332 static void nfs_clear_label_invalid(struct inode *inode)
333 {
334 spin_lock(&inode->i_lock);
335 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
336 spin_unlock(&inode->i_lock);
337 }
338
339 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
340 struct nfs4_label *label)
341 {
342 int error;
343
344 if (label == NULL)
345 return;
346
347 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
348 error = security_inode_notifysecctx(inode, label->label,
349 label->len);
350 if (error)
351 printk(KERN_ERR "%s() %s %d "
352 "security_inode_notifysecctx() %d\n",
353 __func__,
354 (char *)label->label,
355 label->len, error);
356 nfs_clear_label_invalid(inode);
357 }
358 }
359
360 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
361 {
362 struct nfs4_label *label = NULL;
363 int minor_version = server->nfs_client->cl_minorversion;
364
365 if (minor_version < 2)
366 return label;
367
368 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
369 return label;
370
371 label = kzalloc(sizeof(struct nfs4_label), flags);
372 if (label == NULL)
373 return ERR_PTR(-ENOMEM);
374
375 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
376 if (label->label == NULL) {
377 kfree(label);
378 return ERR_PTR(-ENOMEM);
379 }
380 label->len = NFS4_MAXLABELLEN;
381
382 return label;
383 }
384 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
385 #else
386 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
387 struct nfs4_label *label)
388 {
389 }
390 #endif
391 EXPORT_SYMBOL_GPL(nfs_setsecurity);
392
393 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
394 struct inode *
395 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
396 {
397 struct nfs_find_desc desc = {
398 .fh = fh,
399 .fattr = fattr,
400 };
401 struct inode *inode;
402 unsigned long hash;
403
404 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
405 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
406 return NULL;
407
408 hash = nfs_fattr_to_ino_t(fattr);
409 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
410
411 dprintk("%s: returning %p\n", __func__, inode);
412 return inode;
413 }
414
415 /*
416 * This is our front-end to iget that looks up inodes by file handle
417 * instead of inode number.
418 */
419 struct inode *
420 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
421 {
422 struct nfs_find_desc desc = {
423 .fh = fh,
424 .fattr = fattr
425 };
426 struct inode *inode = ERR_PTR(-ENOENT);
427 unsigned long hash;
428
429 nfs_attr_check_mountpoint(sb, fattr);
430
431 if (nfs_attr_use_mounted_on_fileid(fattr))
432 fattr->fileid = fattr->mounted_on_fileid;
433 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
434 goto out_no_inode;
435 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
436 goto out_no_inode;
437
438 hash = nfs_fattr_to_ino_t(fattr);
439
440 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
441 if (inode == NULL) {
442 inode = ERR_PTR(-ENOMEM);
443 goto out_no_inode;
444 }
445
446 if (inode->i_state & I_NEW) {
447 struct nfs_inode *nfsi = NFS_I(inode);
448 unsigned long now = jiffies;
449
450 /* We set i_ino for the few things that still rely on it,
451 * such as stat(2) */
452 inode->i_ino = hash;
453
454 /* We can't support update_atime(), since the server will reset it */
455 inode->i_flags |= S_NOATIME|S_NOCMTIME;
456 inode->i_mode = fattr->mode;
457 nfsi->cache_validity = 0;
458 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
459 && nfs_server_capable(inode, NFS_CAP_MODE))
460 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
461 /* Why so? Because we want revalidate for devices/FIFOs, and
462 * that's precisely what we have in nfs_file_inode_operations.
463 */
464 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
465 if (S_ISREG(inode->i_mode)) {
466 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
467 inode->i_data.a_ops = &nfs_file_aops;
468 } else if (S_ISDIR(inode->i_mode)) {
469 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
470 inode->i_fop = &nfs_dir_operations;
471 inode->i_data.a_ops = &nfs_dir_aops;
472 /* Deal with crossing mountpoints */
473 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
474 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
475 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
476 inode->i_op = &nfs_referral_inode_operations;
477 else
478 inode->i_op = &nfs_mountpoint_inode_operations;
479 inode->i_fop = NULL;
480 inode->i_flags |= S_AUTOMOUNT;
481 }
482 } else if (S_ISLNK(inode->i_mode)) {
483 inode->i_op = &nfs_symlink_inode_operations;
484 inode_nohighmem(inode);
485 } else
486 init_special_inode(inode, inode->i_mode, fattr->rdev);
487
488 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
489 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
490 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
491 inode_set_iversion_raw(inode, 0);
492 inode->i_size = 0;
493 clear_nlink(inode);
494 inode->i_uid = make_kuid(&init_user_ns, -2);
495 inode->i_gid = make_kgid(&init_user_ns, -2);
496 inode->i_blocks = 0;
497 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
498 nfsi->write_io = 0;
499 nfsi->read_io = 0;
500
501 nfsi->read_cache_jiffies = fattr->time_start;
502 nfsi->attr_gencount = fattr->gencount;
503 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
504 inode->i_atime = timespec_to_timespec64(fattr->atime);
505 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
506 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
507 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
508 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
509 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
510 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
511 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
512 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
513 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
514 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
515 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
516 inode_set_iversion_raw(inode, fattr->change_attr);
517 else
518 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
519 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
520 inode->i_size = nfs_size_to_loff_t(fattr->size);
521 else
522 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
523 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
524 set_nlink(inode, fattr->nlink);
525 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
526 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
527 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
528 inode->i_uid = fattr->uid;
529 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
530 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
531 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
532 inode->i_gid = fattr->gid;
533 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
534 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
535 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
536 inode->i_blocks = fattr->du.nfs2.blocks;
537 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
538 /*
539 * report the blocks in 512byte units
540 */
541 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
542 }
543
544 if (nfsi->cache_validity != 0)
545 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
546
547 nfs_setsecurity(inode, fattr, label);
548
549 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
550 nfsi->attrtimeo_timestamp = now;
551 nfsi->access_cache = RB_ROOT;
552
553 nfs_fscache_init_inode(inode);
554
555 unlock_new_inode(inode);
556 } else {
557 int err = nfs_refresh_inode(inode, fattr);
558 if (err < 0) {
559 iput(inode);
560 inode = ERR_PTR(err);
561 goto out_no_inode;
562 }
563 }
564 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
565 inode->i_sb->s_id,
566 (unsigned long long)NFS_FILEID(inode),
567 nfs_display_fhandle_hash(fh),
568 atomic_read(&inode->i_count));
569
570 out:
571 return inode;
572
573 out_no_inode:
574 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
575 goto out;
576 }
577 EXPORT_SYMBOL_GPL(nfs_fhget);
578
579 #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)
580
581 int
582 nfs_setattr(struct dentry *dentry, struct iattr *attr)
583 {
584 struct inode *inode = d_inode(dentry);
585 struct nfs_fattr *fattr;
586 int error = 0;
587
588 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
589
590 /* skip mode change if it's just for clearing setuid/setgid */
591 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
592 attr->ia_valid &= ~ATTR_MODE;
593
594 if (attr->ia_valid & ATTR_SIZE) {
595 BUG_ON(!S_ISREG(inode->i_mode));
596
597 error = inode_newsize_ok(inode, attr->ia_size);
598 if (error)
599 return error;
600
601 if (attr->ia_size == i_size_read(inode))
602 attr->ia_valid &= ~ATTR_SIZE;
603 }
604
605 /* Optimization: if the end result is no change, don't RPC */
606 attr->ia_valid &= NFS_VALID_ATTRS;
607 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
608 return 0;
609
610 trace_nfs_setattr_enter(inode);
611
612 /* Write all dirty data */
613 if (S_ISREG(inode->i_mode))
614 nfs_sync_inode(inode);
615
616 fattr = nfs_alloc_fattr();
617 if (fattr == NULL) {
618 error = -ENOMEM;
619 goto out;
620 }
621
622 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
623 if (error == 0)
624 error = nfs_refresh_inode(inode, fattr);
625 nfs_free_fattr(fattr);
626 out:
627 trace_nfs_setattr_exit(inode, error);
628 return error;
629 }
630 EXPORT_SYMBOL_GPL(nfs_setattr);
631
632 /**
633 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
634 * @inode: inode of the file used
635 * @offset: file offset to start truncating
636 *
637 * This is a copy of the common vmtruncate, but with the locking
638 * corrected to take into account the fact that NFS requires
639 * inode->i_size to be updated under the inode->i_lock.
640 * Note: must be called with inode->i_lock held!
641 */
642 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
643 {
644 int err;
645
646 err = inode_newsize_ok(inode, offset);
647 if (err)
648 goto out;
649
650 i_size_write(inode, offset);
651 /* Optimisation */
652 if (offset == 0)
653 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
654 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
655
656 spin_unlock(&inode->i_lock);
657 truncate_pagecache(inode, offset);
658 spin_lock(&inode->i_lock);
659 out:
660 return err;
661 }
662
663 /**
664 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
665 * @inode: pointer to struct inode
666 * @attr: pointer to struct iattr
667 * @fattr: pointer to struct nfs_fattr
668 *
669 * Note: we do this in the *proc.c in order to ensure that
670 * it works for things like exclusive creates too.
671 */
672 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
673 struct nfs_fattr *fattr)
674 {
675 /* Barrier: bump the attribute generation count. */
676 nfs_fattr_set_barrier(fattr);
677
678 spin_lock(&inode->i_lock);
679 NFS_I(inode)->attr_gencount = fattr->gencount;
680 if ((attr->ia_valid & ATTR_SIZE) != 0) {
681 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
682 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
683 nfs_vmtruncate(inode, attr->ia_size);
684 }
685 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
686 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
687 if ((attr->ia_valid & ATTR_MODE) != 0) {
688 int mode = attr->ia_mode & S_IALLUGO;
689 mode |= inode->i_mode & ~S_IALLUGO;
690 inode->i_mode = mode;
691 }
692 if ((attr->ia_valid & ATTR_UID) != 0)
693 inode->i_uid = attr->ia_uid;
694 if ((attr->ia_valid & ATTR_GID) != 0)
695 inode->i_gid = attr->ia_gid;
696 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
697 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
698 else
699 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
700 | NFS_INO_INVALID_CTIME);
701 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
702 | NFS_INO_INVALID_ACL);
703 }
704 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
705 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
706 | NFS_INO_INVALID_CTIME);
707 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
708 inode->i_atime = timespec_to_timespec64(fattr->atime);
709 else if (attr->ia_valid & ATTR_ATIME_SET)
710 inode->i_atime = attr->ia_atime;
711 else
712 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
713
714 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
715 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
716 else
717 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
718 | NFS_INO_INVALID_CTIME);
719 }
720 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
721 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
722 | NFS_INO_INVALID_CTIME);
723 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
724 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
725 else if (attr->ia_valid & ATTR_MTIME_SET)
726 inode->i_mtime = attr->ia_mtime;
727 else
728 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
729
730 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
731 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
732 else
733 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
734 | NFS_INO_INVALID_CTIME);
735 }
736 if (fattr->valid)
737 nfs_update_inode(inode, fattr);
738 spin_unlock(&inode->i_lock);
739 }
740 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
741
742 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
743 {
744 struct dentry *parent;
745
746 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
747 return;
748 parent = dget_parent(dentry);
749 nfs_force_use_readdirplus(d_inode(parent));
750 dput(parent);
751 }
752
753 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
754 {
755 struct dentry *parent;
756
757 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
758 return;
759 parent = dget_parent(dentry);
760 nfs_advise_use_readdirplus(d_inode(parent));
761 dput(parent);
762 }
763
764 static bool nfs_need_revalidate_inode(struct inode *inode)
765 {
766 if (NFS_I(inode)->cache_validity &
767 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
768 return true;
769 if (nfs_attribute_cache_expired(inode))
770 return true;
771 return false;
772 }
773
774 int nfs_getattr(const struct path *path, struct kstat *stat,
775 u32 request_mask, unsigned int query_flags)
776 {
777 struct inode *inode = d_inode(path->dentry);
778 struct nfs_server *server = NFS_SERVER(inode);
779 unsigned long cache_validity;
780 int err = 0;
781 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
782 bool do_update = false;
783
784 trace_nfs_getattr_enter(inode);
785
786 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
787 goto out_no_update;
788
789 /* Flush out writes to the server in order to update c/mtime. */
790 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
791 S_ISREG(inode->i_mode)) {
792 err = filemap_write_and_wait(inode->i_mapping);
793 if (err)
794 goto out;
795 }
796
797 /*
798 * We may force a getattr if the user cares about atime.
799 *
800 * Note that we only have to check the vfsmount flags here:
801 * - NFS always sets S_NOATIME by so checking it would give a
802 * bogus result
803 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
804 * no point in checking those.
805 */
806 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
807 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
808 request_mask &= ~STATX_ATIME;
809
810 /* Is the user requesting attributes that might need revalidation? */
811 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
812 STATX_MTIME|STATX_UID|STATX_GID|
813 STATX_SIZE|STATX_BLOCKS)))
814 goto out_no_revalidate;
815
816 /* Check whether the cached attributes are stale */
817 do_update |= force_sync || nfs_attribute_cache_expired(inode);
818 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
819 do_update |= cache_validity &
820 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
821 if (request_mask & STATX_ATIME)
822 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
823 if (request_mask & (STATX_CTIME|STATX_MTIME))
824 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
825 if (do_update) {
826 /* Update the attribute cache */
827 if (!(server->flags & NFS_MOUNT_NOAC))
828 nfs_readdirplus_parent_cache_miss(path->dentry);
829 else
830 nfs_readdirplus_parent_cache_hit(path->dentry);
831 err = __nfs_revalidate_inode(server, inode);
832 if (err)
833 goto out;
834 } else
835 nfs_readdirplus_parent_cache_hit(path->dentry);
836 out_no_revalidate:
837 /* Only return attributes that were revalidated. */
838 stat->result_mask &= request_mask;
839 out_no_update:
840 generic_fillattr(inode, stat);
841 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
842 if (S_ISDIR(inode->i_mode))
843 stat->blksize = NFS_SERVER(inode)->dtsize;
844 out:
845 trace_nfs_getattr_exit(inode, err);
846 return err;
847 }
848 EXPORT_SYMBOL_GPL(nfs_getattr);
849
850 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
851 {
852 refcount_set(&l_ctx->count, 1);
853 l_ctx->lockowner = current->files;
854 INIT_LIST_HEAD(&l_ctx->list);
855 atomic_set(&l_ctx->io_count, 0);
856 }
857
858 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
859 {
860 struct nfs_lock_context *head = &ctx->lock_context;
861 struct nfs_lock_context *pos = head;
862
863 do {
864 if (pos->lockowner != current->files)
865 continue;
866 refcount_inc(&pos->count);
867 return pos;
868 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
869 return NULL;
870 }
871
872 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
873 {
874 struct nfs_lock_context *res, *new = NULL;
875 struct inode *inode = d_inode(ctx->dentry);
876
877 spin_lock(&inode->i_lock);
878 res = __nfs_find_lock_context(ctx);
879 if (res == NULL) {
880 spin_unlock(&inode->i_lock);
881 new = kmalloc(sizeof(*new), GFP_KERNEL);
882 if (new == NULL)
883 return ERR_PTR(-ENOMEM);
884 nfs_init_lock_context(new);
885 spin_lock(&inode->i_lock);
886 res = __nfs_find_lock_context(ctx);
887 if (res == NULL) {
888 list_add_tail(&new->list, &ctx->lock_context.list);
889 new->open_context = ctx;
890 res = new;
891 new = NULL;
892 }
893 }
894 spin_unlock(&inode->i_lock);
895 kfree(new);
896 return res;
897 }
898 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
899
900 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
901 {
902 struct nfs_open_context *ctx = l_ctx->open_context;
903 struct inode *inode = d_inode(ctx->dentry);
904
905 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
906 return;
907 list_del(&l_ctx->list);
908 spin_unlock(&inode->i_lock);
909 kfree(l_ctx);
910 }
911 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
912
913 /**
914 * nfs_close_context - Common close_context() routine NFSv2/v3
915 * @ctx: pointer to context
916 * @is_sync: is this a synchronous close
917 *
918 * Ensure that the attributes are up to date if we're mounted
919 * with close-to-open semantics and we have cached data that will
920 * need to be revalidated on open.
921 */
922 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
923 {
924 struct nfs_inode *nfsi;
925 struct inode *inode;
926 struct nfs_server *server;
927
928 if (!(ctx->mode & FMODE_WRITE))
929 return;
930 if (!is_sync)
931 return;
932 inode = d_inode(ctx->dentry);
933 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
934 return;
935 nfsi = NFS_I(inode);
936 if (inode->i_mapping->nrpages == 0)
937 return;
938 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
939 return;
940 if (!list_empty(&nfsi->open_files))
941 return;
942 server = NFS_SERVER(inode);
943 if (server->flags & NFS_MOUNT_NOCTO)
944 return;
945 nfs_revalidate_inode(server, inode);
946 }
947 EXPORT_SYMBOL_GPL(nfs_close_context);
948
949 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
950 fmode_t f_mode,
951 struct file *filp)
952 {
953 struct nfs_open_context *ctx;
954 struct rpc_cred *cred = rpc_lookup_cred();
955 if (IS_ERR(cred))
956 return ERR_CAST(cred);
957
958 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
959 if (!ctx) {
960 put_rpccred(cred);
961 return ERR_PTR(-ENOMEM);
962 }
963 nfs_sb_active(dentry->d_sb);
964 ctx->dentry = dget(dentry);
965 ctx->cred = cred;
966 ctx->state = NULL;
967 ctx->mode = f_mode;
968 ctx->flags = 0;
969 ctx->error = 0;
970 ctx->flock_owner = (fl_owner_t)filp;
971 nfs_init_lock_context(&ctx->lock_context);
972 ctx->lock_context.open_context = ctx;
973 INIT_LIST_HEAD(&ctx->list);
974 ctx->mdsthreshold = NULL;
975 return ctx;
976 }
977 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
978
979 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
980 {
981 if (ctx != NULL)
982 refcount_inc(&ctx->lock_context.count);
983 return ctx;
984 }
985 EXPORT_SYMBOL_GPL(get_nfs_open_context);
986
987 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
988 {
989 struct inode *inode = d_inode(ctx->dentry);
990 struct super_block *sb = ctx->dentry->d_sb;
991
992 if (!list_empty(&ctx->list)) {
993 if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
994 return;
995 list_del(&ctx->list);
996 spin_unlock(&inode->i_lock);
997 } else if (!refcount_dec_and_test(&ctx->lock_context.count))
998 return;
999 if (inode != NULL)
1000 NFS_PROTO(inode)->close_context(ctx, is_sync);
1001 if (ctx->cred != NULL)
1002 put_rpccred(ctx->cred);
1003 dput(ctx->dentry);
1004 nfs_sb_deactive(sb);
1005 kfree(ctx->mdsthreshold);
1006 kfree(ctx);
1007 }
1008
1009 void put_nfs_open_context(struct nfs_open_context *ctx)
1010 {
1011 __put_nfs_open_context(ctx, 0);
1012 }
1013 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1014
1015 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1016 {
1017 __put_nfs_open_context(ctx, 1);
1018 }
1019
1020 /*
1021 * Ensure that mmap has a recent RPC credential for use when writing out
1022 * shared pages
1023 */
1024 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1025 {
1026 struct inode *inode = d_inode(ctx->dentry);
1027 struct nfs_inode *nfsi = NFS_I(inode);
1028
1029 spin_lock(&inode->i_lock);
1030 if (ctx->mode & FMODE_WRITE)
1031 list_add(&ctx->list, &nfsi->open_files);
1032 else
1033 list_add_tail(&ctx->list, &nfsi->open_files);
1034 spin_unlock(&inode->i_lock);
1035 }
1036 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1037
1038 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1039 {
1040 filp->private_data = get_nfs_open_context(ctx);
1041 if (list_empty(&ctx->list))
1042 nfs_inode_attach_open_context(ctx);
1043 }
1044 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1045
1046 /*
1047 * Given an inode, search for an open context with the desired characteristics
1048 */
1049 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1050 {
1051 struct nfs_inode *nfsi = NFS_I(inode);
1052 struct nfs_open_context *pos, *ctx = NULL;
1053
1054 spin_lock(&inode->i_lock);
1055 list_for_each_entry(pos, &nfsi->open_files, list) {
1056 if (cred != NULL && pos->cred != cred)
1057 continue;
1058 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1059 continue;
1060 ctx = get_nfs_open_context(pos);
1061 break;
1062 }
1063 spin_unlock(&inode->i_lock);
1064 return ctx;
1065 }
1066
1067 void nfs_file_clear_open_context(struct file *filp)
1068 {
1069 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1070
1071 if (ctx) {
1072 struct inode *inode = d_inode(ctx->dentry);
1073
1074 /*
1075 * We fatal error on write before. Try to writeback
1076 * every page again.
1077 */
1078 if (ctx->error < 0)
1079 invalidate_inode_pages2(inode->i_mapping);
1080 filp->private_data = NULL;
1081 spin_lock(&inode->i_lock);
1082 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1083 spin_unlock(&inode->i_lock);
1084 put_nfs_open_context_sync(ctx);
1085 }
1086 }
1087
1088 /*
1089 * These allocate and release file read/write context information.
1090 */
1091 int nfs_open(struct inode *inode, struct file *filp)
1092 {
1093 struct nfs_open_context *ctx;
1094
1095 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1096 if (IS_ERR(ctx))
1097 return PTR_ERR(ctx);
1098 nfs_file_set_open_context(filp, ctx);
1099 put_nfs_open_context(ctx);
1100 nfs_fscache_open_file(inode, filp);
1101 return 0;
1102 }
1103
1104 /*
1105 * This function is called whenever some part of NFS notices that
1106 * the cached attributes have to be refreshed.
1107 */
1108 int
1109 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1110 {
1111 int status = -ESTALE;
1112 struct nfs4_label *label = NULL;
1113 struct nfs_fattr *fattr = NULL;
1114 struct nfs_inode *nfsi = NFS_I(inode);
1115
1116 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1117 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1118
1119 trace_nfs_revalidate_inode_enter(inode);
1120
1121 if (is_bad_inode(inode))
1122 goto out;
1123 if (NFS_STALE(inode))
1124 goto out;
1125
1126 /* pNFS: Attributes aren't updated until we layoutcommit */
1127 if (S_ISREG(inode->i_mode)) {
1128 status = pnfs_sync_inode(inode, false);
1129 if (status)
1130 goto out;
1131 }
1132
1133 status = -ENOMEM;
1134 fattr = nfs_alloc_fattr();
1135 if (fattr == NULL)
1136 goto out;
1137
1138 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1139
1140 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1141 if (IS_ERR(label)) {
1142 status = PTR_ERR(label);
1143 goto out;
1144 }
1145
1146 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1147 label, inode);
1148 if (status != 0) {
1149 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1150 inode->i_sb->s_id,
1151 (unsigned long long)NFS_FILEID(inode), status);
1152 if (status == -ESTALE) {
1153 nfs_zap_caches(inode);
1154 if (!S_ISDIR(inode->i_mode))
1155 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1156 }
1157 goto err_out;
1158 }
1159
1160 status = nfs_refresh_inode(inode, fattr);
1161 if (status) {
1162 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1163 inode->i_sb->s_id,
1164 (unsigned long long)NFS_FILEID(inode), status);
1165 goto err_out;
1166 }
1167
1168 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1169 nfs_zap_acl_cache(inode);
1170
1171 nfs_setsecurity(inode, fattr, label);
1172
1173 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1174 inode->i_sb->s_id,
1175 (unsigned long long)NFS_FILEID(inode));
1176
1177 err_out:
1178 nfs4_label_free(label);
1179 out:
1180 nfs_free_fattr(fattr);
1181 trace_nfs_revalidate_inode_exit(inode, status);
1182 return status;
1183 }
1184
1185 int nfs_attribute_cache_expired(struct inode *inode)
1186 {
1187 if (nfs_have_delegated_attributes(inode))
1188 return 0;
1189 return nfs_attribute_timeout(inode);
1190 }
1191
1192 /**
1193 * nfs_revalidate_inode - Revalidate the inode attributes
1194 * @server - pointer to nfs_server struct
1195 * @inode - pointer to inode struct
1196 *
1197 * Updates inode attribute information by retrieving the data from the server.
1198 */
1199 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1200 {
1201 if (!nfs_need_revalidate_inode(inode))
1202 return NFS_STALE(inode) ? -ESTALE : 0;
1203 return __nfs_revalidate_inode(server, inode);
1204 }
1205 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1206
1207 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1208 {
1209 struct nfs_inode *nfsi = NFS_I(inode);
1210 int ret;
1211
1212 if (mapping->nrpages != 0) {
1213 if (S_ISREG(inode->i_mode)) {
1214 ret = nfs_sync_mapping(mapping);
1215 if (ret < 0)
1216 return ret;
1217 }
1218 ret = invalidate_inode_pages2(mapping);
1219 if (ret < 0)
1220 return ret;
1221 }
1222 if (S_ISDIR(inode->i_mode)) {
1223 spin_lock(&inode->i_lock);
1224 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1225 spin_unlock(&inode->i_lock);
1226 }
1227 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1228 nfs_fscache_wait_on_invalidate(inode);
1229
1230 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1231 inode->i_sb->s_id,
1232 (unsigned long long)NFS_FILEID(inode));
1233 return 0;
1234 }
1235
1236 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1237 {
1238 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1239 NFS_STALE(inode);
1240 }
1241
1242 int nfs_revalidate_mapping_rcu(struct inode *inode)
1243 {
1244 struct nfs_inode *nfsi = NFS_I(inode);
1245 unsigned long *bitlock = &nfsi->flags;
1246 int ret = 0;
1247
1248 if (IS_SWAPFILE(inode))
1249 goto out;
1250 if (nfs_mapping_need_revalidate_inode(inode)) {
1251 ret = -ECHILD;
1252 goto out;
1253 }
1254 spin_lock(&inode->i_lock);
1255 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1256 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1257 ret = -ECHILD;
1258 spin_unlock(&inode->i_lock);
1259 out:
1260 return ret;
1261 }
1262
1263 /**
1264 * nfs_revalidate_mapping - Revalidate the pagecache
1265 * @inode - pointer to host inode
1266 * @mapping - pointer to mapping
1267 */
1268 int nfs_revalidate_mapping(struct inode *inode,
1269 struct address_space *mapping)
1270 {
1271 struct nfs_inode *nfsi = NFS_I(inode);
1272 unsigned long *bitlock = &nfsi->flags;
1273 int ret = 0;
1274
1275 /* swapfiles are not supposed to be shared. */
1276 if (IS_SWAPFILE(inode))
1277 goto out;
1278
1279 if (nfs_mapping_need_revalidate_inode(inode)) {
1280 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1281 if (ret < 0)
1282 goto out;
1283 }
1284
1285 /*
1286 * We must clear NFS_INO_INVALID_DATA first to ensure that
1287 * invalidations that come in while we're shooting down the mappings
1288 * are respected. But, that leaves a race window where one revalidator
1289 * can clear the flag, and then another checks it before the mapping
1290 * gets invalidated. Fix that by serializing access to this part of
1291 * the function.
1292 *
1293 * At the same time, we need to allow other tasks to see whether we
1294 * might be in the middle of invalidating the pages, so we only set
1295 * the bit lock here if it looks like we're going to be doing that.
1296 */
1297 for (;;) {
1298 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1299 nfs_wait_bit_killable, TASK_KILLABLE);
1300 if (ret)
1301 goto out;
1302 spin_lock(&inode->i_lock);
1303 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1304 spin_unlock(&inode->i_lock);
1305 continue;
1306 }
1307 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1308 break;
1309 spin_unlock(&inode->i_lock);
1310 goto out;
1311 }
1312
1313 set_bit(NFS_INO_INVALIDATING, bitlock);
1314 smp_wmb();
1315 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1316 spin_unlock(&inode->i_lock);
1317 trace_nfs_invalidate_mapping_enter(inode);
1318 ret = nfs_invalidate_mapping(inode, mapping);
1319 trace_nfs_invalidate_mapping_exit(inode, ret);
1320
1321 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1322 smp_mb__after_atomic();
1323 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1324 out:
1325 return ret;
1326 }
1327
1328 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1329 {
1330 struct inode *inode = &nfsi->vfs_inode;
1331
1332 assert_spin_locked(&inode->i_lock);
1333
1334 if (!S_ISREG(inode->i_mode))
1335 return false;
1336 if (list_empty(&nfsi->open_files))
1337 return false;
1338 /* Note: This relies on nfsi->open_files being ordered with writers
1339 * being placed at the head of the list.
1340 * See nfs_inode_attach_open_context()
1341 */
1342 return (list_first_entry(&nfsi->open_files,
1343 struct nfs_open_context,
1344 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1345 }
1346
1347 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1348 {
1349 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1350 }
1351
1352 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1353 {
1354 struct timespec ts;
1355
1356 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1357 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1358 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1359 inode_set_iversion_raw(inode, fattr->change_attr);
1360 if (S_ISDIR(inode->i_mode))
1361 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1362 }
1363 /* If we have atomic WCC data, we may update some attributes */
1364 ts = timespec64_to_timespec(inode->i_ctime);
1365 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1366 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1367 && timespec_equal(&ts, &fattr->pre_ctime)) {
1368 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1369 }
1370
1371 ts = timespec64_to_timespec(inode->i_mtime);
1372 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1373 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1374 && timespec_equal(&ts, &fattr->pre_mtime)) {
1375 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1376 if (S_ISDIR(inode->i_mode))
1377 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1378 }
1379 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1380 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1381 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1382 && !nfs_have_writebacks(inode)) {
1383 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1384 }
1385 }
1386
1387 /**
1388 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1389 * @inode - pointer to inode
1390 * @fattr - updated attributes
1391 *
1392 * Verifies the attribute cache. If we have just changed the attributes,
1393 * so that fattr carries weak cache consistency data, then it may
1394 * also update the ctime/mtime/change_attribute.
1395 */
1396 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1397 {
1398 struct nfs_inode *nfsi = NFS_I(inode);
1399 loff_t cur_size, new_isize;
1400 unsigned long invalid = 0;
1401 struct timespec ts;
1402
1403 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1404 return 0;
1405
1406 /* Has the inode gone and changed behind our back? */
1407 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1408 return -ESTALE;
1409 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1410 return -ESTALE;
1411
1412 if (!nfs_file_has_buffered_writers(nfsi)) {
1413 /* Verify a few of the more important attributes */
1414 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1415 invalid |= NFS_INO_INVALID_CHANGE
1416 | NFS_INO_REVAL_PAGECACHE;
1417
1418 ts = timespec64_to_timespec(inode->i_mtime);
1419 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime))
1420 invalid |= NFS_INO_INVALID_MTIME;
1421
1422 ts = timespec64_to_timespec(inode->i_ctime);
1423 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime))
1424 invalid |= NFS_INO_INVALID_CTIME;
1425
1426 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1427 cur_size = i_size_read(inode);
1428 new_isize = nfs_size_to_loff_t(fattr->size);
1429 if (cur_size != new_isize)
1430 invalid |= NFS_INO_INVALID_SIZE
1431 | NFS_INO_REVAL_PAGECACHE;
1432 }
1433 }
1434
1435 /* Have any file permissions changed? */
1436 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1437 invalid |= NFS_INO_INVALID_ACCESS
1438 | NFS_INO_INVALID_ACL
1439 | NFS_INO_INVALID_OTHER;
1440 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1441 invalid |= NFS_INO_INVALID_ACCESS
1442 | NFS_INO_INVALID_ACL
1443 | NFS_INO_INVALID_OTHER;
1444 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1445 invalid |= NFS_INO_INVALID_ACCESS
1446 | NFS_INO_INVALID_ACL
1447 | NFS_INO_INVALID_OTHER;
1448
1449 /* Has the link count changed? */
1450 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1451 invalid |= NFS_INO_INVALID_OTHER;
1452
1453 ts = timespec64_to_timespec(inode->i_atime);
1454 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime))
1455 invalid |= NFS_INO_INVALID_ATIME;
1456
1457 if (invalid != 0)
1458 nfs_set_cache_invalid(inode, invalid);
1459
1460 nfsi->read_cache_jiffies = fattr->time_start;
1461 return 0;
1462 }
1463
1464 static atomic_long_t nfs_attr_generation_counter;
1465
1466 static unsigned long nfs_read_attr_generation_counter(void)
1467 {
1468 return atomic_long_read(&nfs_attr_generation_counter);
1469 }
1470
1471 unsigned long nfs_inc_attr_generation_counter(void)
1472 {
1473 return atomic_long_inc_return(&nfs_attr_generation_counter);
1474 }
1475 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1476
1477 void nfs_fattr_init(struct nfs_fattr *fattr)
1478 {
1479 fattr->valid = 0;
1480 fattr->time_start = jiffies;
1481 fattr->gencount = nfs_inc_attr_generation_counter();
1482 fattr->owner_name = NULL;
1483 fattr->group_name = NULL;
1484 }
1485 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1486
1487 /**
1488 * nfs_fattr_set_barrier
1489 * @fattr: attributes
1490 *
1491 * Used to set a barrier after an attribute was updated. This
1492 * barrier ensures that older attributes from RPC calls that may
1493 * have raced with our update cannot clobber these new values.
1494 * Note that you are still responsible for ensuring that other
1495 * operations which change the attribute on the server do not
1496 * collide.
1497 */
1498 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1499 {
1500 fattr->gencount = nfs_inc_attr_generation_counter();
1501 }
1502
1503 struct nfs_fattr *nfs_alloc_fattr(void)
1504 {
1505 struct nfs_fattr *fattr;
1506
1507 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1508 if (fattr != NULL)
1509 nfs_fattr_init(fattr);
1510 return fattr;
1511 }
1512 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1513
1514 struct nfs_fh *nfs_alloc_fhandle(void)
1515 {
1516 struct nfs_fh *fh;
1517
1518 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1519 if (fh != NULL)
1520 fh->size = 0;
1521 return fh;
1522 }
1523 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1524
1525 #ifdef NFS_DEBUG
1526 /*
1527 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1528 * in the same way that wireshark does
1529 *
1530 * @fh: file handle
1531 *
1532 * For debugging only.
1533 */
1534 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1535 {
1536 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1537 * not on the result */
1538 return nfs_fhandle_hash(fh);
1539 }
1540 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1541
1542 /*
1543 * _nfs_display_fhandle - display an NFS file handle on the console
1544 *
1545 * @fh: file handle to display
1546 * @caption: display caption
1547 *
1548 * For debugging only.
1549 */
1550 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1551 {
1552 unsigned short i;
1553
1554 if (fh == NULL || fh->size == 0) {
1555 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1556 return;
1557 }
1558
1559 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1560 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1561 for (i = 0; i < fh->size; i += 16) {
1562 __be32 *pos = (__be32 *)&fh->data[i];
1563
1564 switch ((fh->size - i - 1) >> 2) {
1565 case 0:
1566 printk(KERN_DEFAULT " %08x\n",
1567 be32_to_cpup(pos));
1568 break;
1569 case 1:
1570 printk(KERN_DEFAULT " %08x %08x\n",
1571 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1572 break;
1573 case 2:
1574 printk(KERN_DEFAULT " %08x %08x %08x\n",
1575 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1576 be32_to_cpup(pos + 2));
1577 break;
1578 default:
1579 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1580 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1581 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1582 }
1583 }
1584 }
1585 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1586 #endif
1587
1588 /**
1589 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1590 * @inode - pointer to inode
1591 * @fattr - attributes
1592 *
1593 * Attempt to divine whether or not an RPC call reply carrying stale
1594 * attributes got scheduled after another call carrying updated ones.
1595 *
1596 * To do so, the function first assumes that a more recent ctime means
1597 * that the attributes in fattr are newer, however it also attempt to
1598 * catch the case where ctime either didn't change, or went backwards
1599 * (if someone reset the clock on the server) by looking at whether
1600 * or not this RPC call was started after the inode was last updated.
1601 * Note also the check for wraparound of 'attr_gencount'
1602 *
1603 * The function returns 'true' if it thinks the attributes in 'fattr' are
1604 * more recent than the ones cached in the inode.
1605 *
1606 */
1607 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1608 {
1609 const struct nfs_inode *nfsi = NFS_I(inode);
1610
1611 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1612 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1613 }
1614
1615 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1616 {
1617 int ret;
1618
1619 trace_nfs_refresh_inode_enter(inode);
1620
1621 if (nfs_inode_attrs_need_update(inode, fattr))
1622 ret = nfs_update_inode(inode, fattr);
1623 else
1624 ret = nfs_check_inode_attributes(inode, fattr);
1625
1626 trace_nfs_refresh_inode_exit(inode, ret);
1627 return ret;
1628 }
1629
1630 /**
1631 * nfs_refresh_inode - try to update the inode attribute cache
1632 * @inode - pointer to inode
1633 * @fattr - updated attributes
1634 *
1635 * Check that an RPC call that returned attributes has not overlapped with
1636 * other recent updates of the inode metadata, then decide whether it is
1637 * safe to do a full update of the inode attributes, or whether just to
1638 * call nfs_check_inode_attributes.
1639 */
1640 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1641 {
1642 int status;
1643
1644 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1645 return 0;
1646 spin_lock(&inode->i_lock);
1647 status = nfs_refresh_inode_locked(inode, fattr);
1648 spin_unlock(&inode->i_lock);
1649
1650 return status;
1651 }
1652 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1653
1654 static int nfs_post_op_update_inode_locked(struct inode *inode,
1655 struct nfs_fattr *fattr, unsigned int invalid)
1656 {
1657 if (S_ISDIR(inode->i_mode))
1658 invalid |= NFS_INO_INVALID_DATA;
1659 nfs_set_cache_invalid(inode, invalid);
1660 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1661 return 0;
1662 return nfs_refresh_inode_locked(inode, fattr);
1663 }
1664
1665 /**
1666 * nfs_post_op_update_inode - try to update the inode attribute cache
1667 * @inode - pointer to inode
1668 * @fattr - updated attributes
1669 *
1670 * After an operation that has changed the inode metadata, mark the
1671 * attribute cache as being invalid, then try to update it.
1672 *
1673 * NB: if the server didn't return any post op attributes, this
1674 * function will force the retrieval of attributes before the next
1675 * NFS request. Thus it should be used only for operations that
1676 * are expected to change one or more attributes, to avoid
1677 * unnecessary NFS requests and trips through nfs_update_inode().
1678 */
1679 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1680 {
1681 int status;
1682
1683 spin_lock(&inode->i_lock);
1684 nfs_fattr_set_barrier(fattr);
1685 status = nfs_post_op_update_inode_locked(inode, fattr,
1686 NFS_INO_INVALID_CHANGE
1687 | NFS_INO_INVALID_CTIME
1688 | NFS_INO_REVAL_FORCED);
1689 spin_unlock(&inode->i_lock);
1690
1691 return status;
1692 }
1693 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1694
1695 /**
1696 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1697 * @inode - pointer to inode
1698 * @fattr - updated attributes
1699 *
1700 * After an operation that has changed the inode metadata, mark the
1701 * attribute cache as being invalid, then try to update it. Fake up
1702 * weak cache consistency data, if none exist.
1703 *
1704 * This function is mainly designed to be used by the ->write_done() functions.
1705 */
1706 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1707 {
1708 int status;
1709
1710 /* Don't do a WCC update if these attributes are already stale */
1711 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1712 !nfs_inode_attrs_need_update(inode, fattr)) {
1713 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1714 | NFS_ATTR_FATTR_PRESIZE
1715 | NFS_ATTR_FATTR_PREMTIME
1716 | NFS_ATTR_FATTR_PRECTIME);
1717 goto out_noforce;
1718 }
1719 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1720 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1721 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1722 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1723 }
1724 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1725 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1726 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime);
1727 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1728 }
1729 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1730 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1731 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime);
1732 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1733 }
1734 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1735 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1736 fattr->pre_size = i_size_read(inode);
1737 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1738 }
1739 out_noforce:
1740 status = nfs_post_op_update_inode_locked(inode, fattr,
1741 NFS_INO_INVALID_CHANGE
1742 | NFS_INO_INVALID_CTIME
1743 | NFS_INO_INVALID_MTIME);
1744 return status;
1745 }
1746
1747 /**
1748 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1749 * @inode - pointer to inode
1750 * @fattr - updated attributes
1751 *
1752 * After an operation that has changed the inode metadata, mark the
1753 * attribute cache as being invalid, then try to update it. Fake up
1754 * weak cache consistency data, if none exist.
1755 *
1756 * This function is mainly designed to be used by the ->write_done() functions.
1757 */
1758 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1759 {
1760 int status;
1761
1762 spin_lock(&inode->i_lock);
1763 nfs_fattr_set_barrier(fattr);
1764 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1765 spin_unlock(&inode->i_lock);
1766 return status;
1767 }
1768 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1769
1770
1771 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1772 struct nfs_fattr *fattr)
1773 {
1774 bool ret1 = true, ret2 = true;
1775
1776 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1777 ret1 = (nfsi->fileid == fattr->fileid);
1778 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1779 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1780 return ret1 || ret2;
1781 }
1782
1783 /*
1784 * Many nfs protocol calls return the new file attributes after
1785 * an operation. Here we update the inode to reflect the state
1786 * of the server's inode.
1787 *
1788 * This is a bit tricky because we have to make sure all dirty pages
1789 * have been sent off to the server before calling invalidate_inode_pages.
1790 * To make sure no other process adds more write requests while we try
1791 * our best to flush them, we make them sleep during the attribute refresh.
1792 *
1793 * A very similar scenario holds for the dir cache.
1794 */
1795 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1796 {
1797 struct nfs_server *server;
1798 struct nfs_inode *nfsi = NFS_I(inode);
1799 loff_t cur_isize, new_isize;
1800 unsigned long invalid = 0;
1801 unsigned long now = jiffies;
1802 unsigned long save_cache_validity;
1803 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1804 bool cache_revalidated = true;
1805 bool attr_changed = false;
1806 bool have_delegation;
1807
1808 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1809 __func__, inode->i_sb->s_id, inode->i_ino,
1810 nfs_display_fhandle_hash(NFS_FH(inode)),
1811 atomic_read(&inode->i_count), fattr->valid);
1812
1813 if (!nfs_fileid_valid(nfsi, fattr)) {
1814 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1815 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1816 NFS_SERVER(inode)->nfs_client->cl_hostname,
1817 inode->i_sb->s_id, (long long)nfsi->fileid,
1818 (long long)fattr->fileid);
1819 goto out_err;
1820 }
1821
1822 /*
1823 * Make sure the inode's type hasn't changed.
1824 */
1825 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1826 /*
1827 * Big trouble! The inode has become a different object.
1828 */
1829 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1830 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1831 goto out_err;
1832 }
1833
1834 server = NFS_SERVER(inode);
1835 /* Update the fsid? */
1836 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1837 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1838 !IS_AUTOMOUNT(inode))
1839 server->fsid = fattr->fsid;
1840
1841 /* Save the delegation state before clearing cache_validity */
1842 have_delegation = nfs_have_delegated_attributes(inode);
1843
1844 /*
1845 * Update the read time so we don't revalidate too often.
1846 */
1847 nfsi->read_cache_jiffies = fattr->time_start;
1848
1849 save_cache_validity = nfsi->cache_validity;
1850 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1851 | NFS_INO_INVALID_ATIME
1852 | NFS_INO_REVAL_FORCED
1853 | NFS_INO_REVAL_PAGECACHE);
1854
1855 /* Do atomic weak cache consistency updates */
1856 nfs_wcc_update_inode(inode, fattr);
1857
1858 if (pnfs_layoutcommit_outstanding(inode)) {
1859 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1860 cache_revalidated = false;
1861 }
1862
1863 /* More cache consistency checks */
1864 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1865 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1866 /* Could it be a race with writeback? */
1867 if (!(have_writers || have_delegation)) {
1868 invalid |= NFS_INO_INVALID_DATA
1869 | NFS_INO_INVALID_ACCESS
1870 | NFS_INO_INVALID_ACL;
1871 /* Force revalidate of all attributes */
1872 save_cache_validity |= NFS_INO_INVALID_CTIME
1873 | NFS_INO_INVALID_MTIME
1874 | NFS_INO_INVALID_SIZE
1875 | NFS_INO_INVALID_OTHER;
1876 if (S_ISDIR(inode->i_mode))
1877 nfs_force_lookup_revalidate(inode);
1878 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1879 inode->i_sb->s_id,
1880 inode->i_ino);
1881 }
1882 inode_set_iversion_raw(inode, fattr->change_attr);
1883 attr_changed = true;
1884 }
1885 } else {
1886 nfsi->cache_validity |= save_cache_validity &
1887 (NFS_INO_INVALID_CHANGE
1888 | NFS_INO_REVAL_PAGECACHE
1889 | NFS_INO_REVAL_FORCED);
1890 cache_revalidated = false;
1891 }
1892
1893 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1894 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1895 } else if (server->caps & NFS_CAP_MTIME) {
1896 nfsi->cache_validity |= save_cache_validity &
1897 (NFS_INO_INVALID_MTIME
1898 | NFS_INO_REVAL_FORCED);
1899 cache_revalidated = false;
1900 }
1901
1902 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1903 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1904 } else if (server->caps & NFS_CAP_CTIME) {
1905 nfsi->cache_validity |= save_cache_validity &
1906 (NFS_INO_INVALID_CTIME
1907 | NFS_INO_REVAL_FORCED);
1908 cache_revalidated = false;
1909 }
1910
1911 /* Check if our cached file size is stale */
1912 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1913 new_isize = nfs_size_to_loff_t(fattr->size);
1914 cur_isize = i_size_read(inode);
1915 if (new_isize != cur_isize && !have_delegation) {
1916 /* Do we perhaps have any outstanding writes, or has
1917 * the file grown beyond our last write? */
1918 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1919 i_size_write(inode, new_isize);
1920 if (!have_writers)
1921 invalid |= NFS_INO_INVALID_DATA;
1922 attr_changed = true;
1923 }
1924 dprintk("NFS: isize change on server for file %s/%ld "
1925 "(%Ld to %Ld)\n",
1926 inode->i_sb->s_id,
1927 inode->i_ino,
1928 (long long)cur_isize,
1929 (long long)new_isize);
1930 }
1931 } else {
1932 nfsi->cache_validity |= save_cache_validity &
1933 (NFS_INO_INVALID_SIZE
1934 | NFS_INO_REVAL_PAGECACHE
1935 | NFS_INO_REVAL_FORCED);
1936 cache_revalidated = false;
1937 }
1938
1939
1940 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1941 inode->i_atime = timespec_to_timespec64(fattr->atime);
1942 else if (server->caps & NFS_CAP_ATIME) {
1943 nfsi->cache_validity |= save_cache_validity &
1944 (NFS_INO_INVALID_ATIME
1945 | NFS_INO_REVAL_FORCED);
1946 cache_revalidated = false;
1947 }
1948
1949 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1950 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1951 umode_t newmode = inode->i_mode & S_IFMT;
1952 newmode |= fattr->mode & S_IALLUGO;
1953 inode->i_mode = newmode;
1954 invalid |= NFS_INO_INVALID_ACCESS
1955 | NFS_INO_INVALID_ACL;
1956 attr_changed = true;
1957 }
1958 } else if (server->caps & NFS_CAP_MODE) {
1959 nfsi->cache_validity |= save_cache_validity &
1960 (NFS_INO_INVALID_OTHER
1961 | NFS_INO_REVAL_FORCED);
1962 cache_revalidated = false;
1963 }
1964
1965 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1966 if (!uid_eq(inode->i_uid, fattr->uid)) {
1967 invalid |= NFS_INO_INVALID_ACCESS
1968 | NFS_INO_INVALID_ACL;
1969 inode->i_uid = fattr->uid;
1970 attr_changed = true;
1971 }
1972 } else if (server->caps & NFS_CAP_OWNER) {
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_GROUP) {
1980 if (!gid_eq(inode->i_gid, fattr->gid)) {
1981 invalid |= NFS_INO_INVALID_ACCESS
1982 | NFS_INO_INVALID_ACL;
1983 inode->i_gid = fattr->gid;
1984 attr_changed = true;
1985 }
1986 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
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_NLINK) {
1994 if (inode->i_nlink != fattr->nlink) {
1995 if (S_ISDIR(inode->i_mode))
1996 invalid |= NFS_INO_INVALID_DATA;
1997 set_nlink(inode, fattr->nlink);
1998 attr_changed = true;
1999 }
2000 } else if (server->caps & NFS_CAP_NLINK) {
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_SPACE_USED) {
2008 /*
2009 * report the blocks in 512byte units
2010 */
2011 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2012 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2013 inode->i_blocks = fattr->du.nfs2.blocks;
2014 else
2015 cache_revalidated = false;
2016
2017 /* Update attrtimeo value if we're out of the unstable period */
2018 if (attr_changed) {
2019 invalid &= ~NFS_INO_INVALID_ATTR;
2020 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2021 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2022 nfsi->attrtimeo_timestamp = now;
2023 /* Set barrier to be more recent than all outstanding updates */
2024 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2025 } else {
2026 if (cache_revalidated) {
2027 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2028 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2029 nfsi->attrtimeo <<= 1;
2030 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2031 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2032 }
2033 nfsi->attrtimeo_timestamp = now;
2034 }
2035 /* Set the barrier to be more recent than this fattr */
2036 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2037 nfsi->attr_gencount = fattr->gencount;
2038 }
2039
2040 /* Don't invalidate the data if we were to blame */
2041 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2042 || S_ISLNK(inode->i_mode)))
2043 invalid &= ~NFS_INO_INVALID_DATA;
2044 nfs_set_cache_invalid(inode, invalid);
2045
2046 return 0;
2047 out_err:
2048 /*
2049 * No need to worry about unhashing the dentry, as the
2050 * lookup validation will know that the inode is bad.
2051 * (But we fall through to invalidate the caches.)
2052 */
2053 nfs_invalidate_inode(inode);
2054 return -ESTALE;
2055 }
2056
2057 struct inode *nfs_alloc_inode(struct super_block *sb)
2058 {
2059 struct nfs_inode *nfsi;
2060 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2061 if (!nfsi)
2062 return NULL;
2063 nfsi->flags = 0UL;
2064 nfsi->cache_validity = 0UL;
2065 #if IS_ENABLED(CONFIG_NFS_V4)
2066 nfsi->nfs4_acl = NULL;
2067 #endif /* CONFIG_NFS_V4 */
2068 return &nfsi->vfs_inode;
2069 }
2070 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2071
2072 static void nfs_i_callback(struct rcu_head *head)
2073 {
2074 struct inode *inode = container_of(head, struct inode, i_rcu);
2075 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2076 }
2077
2078 void nfs_destroy_inode(struct inode *inode)
2079 {
2080 call_rcu(&inode->i_rcu, nfs_i_callback);
2081 }
2082 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
2083
2084 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2085 {
2086 #if IS_ENABLED(CONFIG_NFS_V4)
2087 INIT_LIST_HEAD(&nfsi->open_states);
2088 nfsi->delegation = NULL;
2089 init_rwsem(&nfsi->rwsem);
2090 nfsi->layout = NULL;
2091 #endif
2092 }
2093
2094 static void init_once(void *foo)
2095 {
2096 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2097
2098 inode_init_once(&nfsi->vfs_inode);
2099 INIT_LIST_HEAD(&nfsi->open_files);
2100 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2101 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2102 INIT_LIST_HEAD(&nfsi->commit_info.list);
2103 atomic_long_set(&nfsi->nrequests, 0);
2104 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2105 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2106 init_rwsem(&nfsi->rmdir_sem);
2107 mutex_init(&nfsi->commit_mutex);
2108 nfs4_init_once(nfsi);
2109 }
2110
2111 static int __init nfs_init_inodecache(void)
2112 {
2113 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2114 sizeof(struct nfs_inode),
2115 0, (SLAB_RECLAIM_ACCOUNT|
2116 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2117 init_once);
2118 if (nfs_inode_cachep == NULL)
2119 return -ENOMEM;
2120
2121 return 0;
2122 }
2123
2124 static void nfs_destroy_inodecache(void)
2125 {
2126 /*
2127 * Make sure all delayed rcu free inodes are flushed before we
2128 * destroy cache.
2129 */
2130 rcu_barrier();
2131 kmem_cache_destroy(nfs_inode_cachep);
2132 }
2133
2134 struct workqueue_struct *nfsiod_workqueue;
2135 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2136
2137 /*
2138 * start up the nfsiod workqueue
2139 */
2140 static int nfsiod_start(void)
2141 {
2142 struct workqueue_struct *wq;
2143 dprintk("RPC: creating workqueue nfsiod\n");
2144 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2145 if (wq == NULL)
2146 return -ENOMEM;
2147 nfsiod_workqueue = wq;
2148 return 0;
2149 }
2150
2151 /*
2152 * Destroy the nfsiod workqueue
2153 */
2154 static void nfsiod_stop(void)
2155 {
2156 struct workqueue_struct *wq;
2157
2158 wq = nfsiod_workqueue;
2159 if (wq == NULL)
2160 return;
2161 nfsiod_workqueue = NULL;
2162 destroy_workqueue(wq);
2163 }
2164
2165 unsigned int nfs_net_id;
2166 EXPORT_SYMBOL_GPL(nfs_net_id);
2167
2168 static int nfs_net_init(struct net *net)
2169 {
2170 nfs_clients_init(net);
2171 return nfs_fs_proc_net_init(net);
2172 }
2173
2174 static void nfs_net_exit(struct net *net)
2175 {
2176 struct nfs_net *nn = net_generic(net, nfs_net_id);
2177
2178 nfs_fs_proc_net_exit(net);
2179 nfs_cleanup_cb_ident_idr(net);
2180 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2181 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
2182 }
2183
2184 static struct pernet_operations nfs_net_ops = {
2185 .init = nfs_net_init,
2186 .exit = nfs_net_exit,
2187 .id = &nfs_net_id,
2188 .size = sizeof(struct nfs_net),
2189 };
2190
2191 /*
2192 * Initialize NFS
2193 */
2194 static int __init init_nfs_fs(void)
2195 {
2196 int err;
2197
2198 err = register_pernet_subsys(&nfs_net_ops);
2199 if (err < 0)
2200 goto out9;
2201
2202 err = nfs_fscache_register();
2203 if (err < 0)
2204 goto out8;
2205
2206 err = nfsiod_start();
2207 if (err)
2208 goto out7;
2209
2210 err = nfs_fs_proc_init();
2211 if (err)
2212 goto out6;
2213
2214 err = nfs_init_nfspagecache();
2215 if (err)
2216 goto out5;
2217
2218 err = nfs_init_inodecache();
2219 if (err)
2220 goto out4;
2221
2222 err = nfs_init_readpagecache();
2223 if (err)
2224 goto out3;
2225
2226 err = nfs_init_writepagecache();
2227 if (err)
2228 goto out2;
2229
2230 err = nfs_init_directcache();
2231 if (err)
2232 goto out1;
2233
2234 rpc_proc_register(&init_net, &nfs_rpcstat);
2235
2236 err = register_nfs_fs();
2237 if (err)
2238 goto out0;
2239
2240 return 0;
2241 out0:
2242 rpc_proc_unregister(&init_net, "nfs");
2243 nfs_destroy_directcache();
2244 out1:
2245 nfs_destroy_writepagecache();
2246 out2:
2247 nfs_destroy_readpagecache();
2248 out3:
2249 nfs_destroy_inodecache();
2250 out4:
2251 nfs_destroy_nfspagecache();
2252 out5:
2253 nfs_fs_proc_exit();
2254 out6:
2255 nfsiod_stop();
2256 out7:
2257 nfs_fscache_unregister();
2258 out8:
2259 unregister_pernet_subsys(&nfs_net_ops);
2260 out9:
2261 return err;
2262 }
2263
2264 static void __exit exit_nfs_fs(void)
2265 {
2266 nfs_destroy_directcache();
2267 nfs_destroy_writepagecache();
2268 nfs_destroy_readpagecache();
2269 nfs_destroy_inodecache();
2270 nfs_destroy_nfspagecache();
2271 nfs_fscache_unregister();
2272 unregister_pernet_subsys(&nfs_net_ops);
2273 rpc_proc_unregister(&init_net, "nfs");
2274 unregister_nfs_fs();
2275 nfs_fs_proc_exit();
2276 nfsiod_stop();
2277 }
2278
2279 /* Not quite true; I just maintain it */
2280 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2281 MODULE_LICENSE("GPL");
2282 module_param(enable_ino64, bool, 0644);
2283
2284 module_init(init_nfs_fs)
2285 module_exit(exit_nfs_fs)
Linux with added FPC-III support