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Linux 5.10.7
[linux/fpc-iii.git] / fs / nfs / inode.c
blob43af053f467a7686c8720902ecb9cdb804391631
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 */
16
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/sched/signal.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/stat.h>
25 #include <linux/errno.h>
26 #include <linux/unistd.h>
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/stats.h>
29 #include <linux/sunrpc/metrics.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_mount.h>
32 #include <linux/nfs4_mount.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
42 #include <linux/uaccess.h>
43 #include <linux/iversion.h>
44
45 #include "nfs4_fs.h"
46 #include "callback.h"
47 #include "delegation.h"
48 #include "iostat.h"
49 #include "internal.h"
50 #include "fscache.h"
51 #include "pnfs.h"
52 #include "nfs.h"
53 #include "netns.h"
54 #include "sysfs.h"
55
56 #include "nfstrace.h"
57
58 #define NFSDBG_FACILITY NFSDBG_VFS
59
60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62 /* Default is to see 64-bit inode numbers */
63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67 static struct kmem_cache * nfs_inode_cachep;
68
69 static inline unsigned long
70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 {
72 return nfs_fileid_to_ino_t(fattr->fileid);
73 }
74
75 static int nfs_wait_killable(int mode)
76 {
77 freezable_schedule_unsafe();
78 if (signal_pending_state(mode, current))
79 return -ERESTARTSYS;
80 return 0;
81 }
82
83 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84 {
85 return nfs_wait_killable(mode);
86 }
87 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
88
89 /**
90 * nfs_compat_user_ino64 - returns the user-visible inode number
91 * @fileid: 64-bit fileid
92 *
93 * This function returns a 32-bit inode number if the boot parameter
94 * nfs.enable_ino64 is zero.
95 */
96 u64 nfs_compat_user_ino64(u64 fileid)
97 {
98 #ifdef CONFIG_COMPAT
99 compat_ulong_t ino;
100 #else
101 unsigned long ino;
102 #endif
103
104 if (enable_ino64)
105 return fileid;
106 ino = fileid;
107 if (sizeof(ino) < sizeof(fileid))
108 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
109 return ino;
110 }
111
112 int nfs_drop_inode(struct inode *inode)
113 {
114 return NFS_STALE(inode) || generic_drop_inode(inode);
115 }
116 EXPORT_SYMBOL_GPL(nfs_drop_inode);
117
118 void nfs_clear_inode(struct inode *inode)
119 {
120 /*
121 * The following should never happen...
122 */
123 WARN_ON_ONCE(nfs_have_writebacks(inode));
124 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
125 nfs_zap_acl_cache(inode);
126 nfs_access_zap_cache(inode);
127 nfs_fscache_clear_inode(inode);
128 }
129 EXPORT_SYMBOL_GPL(nfs_clear_inode);
130
131 void nfs_evict_inode(struct inode *inode)
132 {
133 truncate_inode_pages_final(&inode->i_data);
134 clear_inode(inode);
135 nfs_clear_inode(inode);
136 }
137
138 int nfs_sync_inode(struct inode *inode)
139 {
140 inode_dio_wait(inode);
141 return nfs_wb_all(inode);
142 }
143 EXPORT_SYMBOL_GPL(nfs_sync_inode);
144
145 /**
146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
147 * @mapping: pointer to struct address_space
148 */
149 int nfs_sync_mapping(struct address_space *mapping)
150 {
151 int ret = 0;
152
153 if (mapping->nrpages != 0) {
154 unmap_mapping_range(mapping, 0, 0, 0);
155 ret = nfs_wb_all(mapping->host);
156 }
157 return ret;
158 }
159
160 static int nfs_attribute_timeout(struct inode *inode)
161 {
162 struct nfs_inode *nfsi = NFS_I(inode);
163
164 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
165 }
166
167 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
168 {
169 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
170
171 /* Special case for the pagecache or access cache */
172 if (flags == NFS_INO_REVAL_PAGECACHE &&
173 !(cache_validity & NFS_INO_REVAL_FORCED))
174 return false;
175 return (cache_validity & flags) != 0;
176 }
177
178 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
179 {
180 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
181
182 if ((cache_validity & flags) != 0)
183 return true;
184 if (nfs_attribute_timeout(inode))
185 return true;
186 return false;
187 }
188
189 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
190 {
191 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
192 return nfs_check_cache_invalid_delegated(inode, flags);
193
194 return nfs_check_cache_invalid_not_delegated(inode, flags);
195 }
196 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
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 | NFS_INO_INVALID_XATTR);
210 }
211
212 if (inode->i_mapping->nrpages == 0)
213 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
214 nfsi->cache_validity |= flags;
215 if (flags & NFS_INO_INVALID_DATA)
216 nfs_fscache_invalidate(inode);
217 }
218
219 /*
220 * Invalidate the local caches
221 */
222 static void nfs_zap_caches_locked(struct inode *inode)
223 {
224 struct nfs_inode *nfsi = NFS_I(inode);
225 int mode = inode->i_mode;
226
227 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
228
229 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
230 nfsi->attrtimeo_timestamp = jiffies;
231
232 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
233 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
234 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
235 | NFS_INO_INVALID_DATA
236 | NFS_INO_INVALID_ACCESS
237 | NFS_INO_INVALID_ACL
238 | NFS_INO_INVALID_XATTR
239 | NFS_INO_REVAL_PAGECACHE);
240 } else
241 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
242 | NFS_INO_INVALID_ACCESS
243 | NFS_INO_INVALID_ACL
244 | NFS_INO_INVALID_XATTR
245 | NFS_INO_REVAL_PAGECACHE);
246 nfs_zap_label_cache_locked(nfsi);
247 }
248
249 void nfs_zap_caches(struct inode *inode)
250 {
251 spin_lock(&inode->i_lock);
252 nfs_zap_caches_locked(inode);
253 spin_unlock(&inode->i_lock);
254 }
255
256 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
257 {
258 if (mapping->nrpages != 0) {
259 spin_lock(&inode->i_lock);
260 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
261 spin_unlock(&inode->i_lock);
262 }
263 }
264
265 void nfs_zap_acl_cache(struct inode *inode)
266 {
267 void (*clear_acl_cache)(struct inode *);
268
269 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
270 if (clear_acl_cache != NULL)
271 clear_acl_cache(inode);
272 spin_lock(&inode->i_lock);
273 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
274 spin_unlock(&inode->i_lock);
275 }
276 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
277
278 void nfs_invalidate_atime(struct inode *inode)
279 {
280 spin_lock(&inode->i_lock);
281 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
282 spin_unlock(&inode->i_lock);
283 }
284 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
285
286 /*
287 * Invalidate, but do not unhash, the inode.
288 * NB: must be called with inode->i_lock held!
289 */
290 static void nfs_set_inode_stale_locked(struct inode *inode)
291 {
292 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
293 nfs_zap_caches_locked(inode);
294 trace_nfs_set_inode_stale(inode);
295 }
296
297 void nfs_set_inode_stale(struct inode *inode)
298 {
299 spin_lock(&inode->i_lock);
300 nfs_set_inode_stale_locked(inode);
301 spin_unlock(&inode->i_lock);
302 }
303
304 struct nfs_find_desc {
305 struct nfs_fh *fh;
306 struct nfs_fattr *fattr;
307 };
308
309 /*
310 * In NFSv3 we can have 64bit inode numbers. In order to support
311 * this, and re-exported directories (also seen in NFSv2)
312 * we are forced to allow 2 different inodes to have the same
313 * i_ino.
314 */
315 static int
316 nfs_find_actor(struct inode *inode, void *opaque)
317 {
318 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
319 struct nfs_fh *fh = desc->fh;
320 struct nfs_fattr *fattr = desc->fattr;
321
322 if (NFS_FILEID(inode) != fattr->fileid)
323 return 0;
324 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
325 return 0;
326 if (nfs_compare_fh(NFS_FH(inode), fh))
327 return 0;
328 if (is_bad_inode(inode) || NFS_STALE(inode))
329 return 0;
330 return 1;
331 }
332
333 static int
334 nfs_init_locked(struct inode *inode, void *opaque)
335 {
336 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
337 struct nfs_fattr *fattr = desc->fattr;
338
339 set_nfs_fileid(inode, fattr->fileid);
340 inode->i_mode = fattr->mode;
341 nfs_copy_fh(NFS_FH(inode), desc->fh);
342 return 0;
343 }
344
345 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
346 static void nfs_clear_label_invalid(struct inode *inode)
347 {
348 spin_lock(&inode->i_lock);
349 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
350 spin_unlock(&inode->i_lock);
351 }
352
353 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
354 struct nfs4_label *label)
355 {
356 int error;
357
358 if (label == NULL)
359 return;
360
361 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
362 error = security_inode_notifysecctx(inode, label->label,
363 label->len);
364 if (error)
365 printk(KERN_ERR "%s() %s %d "
366 "security_inode_notifysecctx() %d\n",
367 __func__,
368 (char *)label->label,
369 label->len, error);
370 nfs_clear_label_invalid(inode);
371 }
372 }
373
374 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
375 {
376 struct nfs4_label *label = NULL;
377 int minor_version = server->nfs_client->cl_minorversion;
378
379 if (minor_version < 2)
380 return label;
381
382 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
383 return label;
384
385 label = kzalloc(sizeof(struct nfs4_label), flags);
386 if (label == NULL)
387 return ERR_PTR(-ENOMEM);
388
389 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
390 if (label->label == NULL) {
391 kfree(label);
392 return ERR_PTR(-ENOMEM);
393 }
394 label->len = NFS4_MAXLABELLEN;
395
396 return label;
397 }
398 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
399 #else
400 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
401 struct nfs4_label *label)
402 {
403 }
404 #endif
405 EXPORT_SYMBOL_GPL(nfs_setsecurity);
406
407 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
408 struct inode *
409 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
410 {
411 struct nfs_find_desc desc = {
412 .fh = fh,
413 .fattr = fattr,
414 };
415 struct inode *inode;
416 unsigned long hash;
417
418 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
419 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
420 return NULL;
421
422 hash = nfs_fattr_to_ino_t(fattr);
423 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
424
425 dprintk("%s: returning %p\n", __func__, inode);
426 return inode;
427 }
428
429 /*
430 * This is our front-end to iget that looks up inodes by file handle
431 * instead of inode number.
432 */
433 struct inode *
434 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
435 {
436 struct nfs_find_desc desc = {
437 .fh = fh,
438 .fattr = fattr
439 };
440 struct inode *inode = ERR_PTR(-ENOENT);
441 unsigned long hash;
442
443 nfs_attr_check_mountpoint(sb, fattr);
444
445 if (nfs_attr_use_mounted_on_fileid(fattr))
446 fattr->fileid = fattr->mounted_on_fileid;
447 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
448 goto out_no_inode;
449 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
450 goto out_no_inode;
451
452 hash = nfs_fattr_to_ino_t(fattr);
453
454 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
455 if (inode == NULL) {
456 inode = ERR_PTR(-ENOMEM);
457 goto out_no_inode;
458 }
459
460 if (inode->i_state & I_NEW) {
461 struct nfs_inode *nfsi = NFS_I(inode);
462 unsigned long now = jiffies;
463
464 /* We set i_ino for the few things that still rely on it,
465 * such as stat(2) */
466 inode->i_ino = hash;
467
468 /* We can't support update_atime(), since the server will reset it */
469 inode->i_flags |= S_NOATIME|S_NOCMTIME;
470 inode->i_mode = fattr->mode;
471 nfsi->cache_validity = 0;
472 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
473 && nfs_server_capable(inode, NFS_CAP_MODE))
474 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
475 /* Why so? Because we want revalidate for devices/FIFOs, and
476 * that's precisely what we have in nfs_file_inode_operations.
477 */
478 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
479 if (S_ISREG(inode->i_mode)) {
480 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
481 inode->i_data.a_ops = &nfs_file_aops;
482 } else if (S_ISDIR(inode->i_mode)) {
483 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
484 inode->i_fop = &nfs_dir_operations;
485 inode->i_data.a_ops = &nfs_dir_aops;
486 /* Deal with crossing mountpoints */
487 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
488 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
489 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
490 inode->i_op = &nfs_referral_inode_operations;
491 else
492 inode->i_op = &nfs_mountpoint_inode_operations;
493 inode->i_fop = NULL;
494 inode->i_flags |= S_AUTOMOUNT;
495 }
496 } else if (S_ISLNK(inode->i_mode)) {
497 inode->i_op = &nfs_symlink_inode_operations;
498 inode_nohighmem(inode);
499 } else
500 init_special_inode(inode, inode->i_mode, fattr->rdev);
501
502 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
503 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
504 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
505 inode_set_iversion_raw(inode, 0);
506 inode->i_size = 0;
507 clear_nlink(inode);
508 inode->i_uid = make_kuid(&init_user_ns, -2);
509 inode->i_gid = make_kgid(&init_user_ns, -2);
510 inode->i_blocks = 0;
511 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
512 nfsi->write_io = 0;
513 nfsi->read_io = 0;
514
515 nfsi->read_cache_jiffies = fattr->time_start;
516 nfsi->attr_gencount = fattr->gencount;
517 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
518 inode->i_atime = fattr->atime;
519 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
520 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
521 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
522 inode->i_mtime = fattr->mtime;
523 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
524 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
525 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
526 inode->i_ctime = fattr->ctime;
527 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
528 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
529 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
530 inode_set_iversion_raw(inode, fattr->change_attr);
531 else
532 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
533 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
534 inode->i_size = nfs_size_to_loff_t(fattr->size);
535 else
536 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
537 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
538 set_nlink(inode, fattr->nlink);
539 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
540 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
541 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
542 inode->i_uid = fattr->uid;
543 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
544 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
545 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
546 inode->i_gid = fattr->gid;
547 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
548 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
549 if (nfs_server_capable(inode, NFS_CAP_XATTR))
550 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
551 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
552 inode->i_blocks = fattr->du.nfs2.blocks;
553 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
554 /*
555 * report the blocks in 512byte units
556 */
557 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
558 }
559
560 if (nfsi->cache_validity != 0)
561 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
562
563 nfs_setsecurity(inode, fattr, label);
564
565 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
566 nfsi->attrtimeo_timestamp = now;
567 nfsi->access_cache = RB_ROOT;
568
569 nfs_fscache_init_inode(inode);
570
571 unlock_new_inode(inode);
572 } else {
573 int err = nfs_refresh_inode(inode, fattr);
574 if (err < 0) {
575 iput(inode);
576 inode = ERR_PTR(err);
577 goto out_no_inode;
578 }
579 }
580 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
581 inode->i_sb->s_id,
582 (unsigned long long)NFS_FILEID(inode),
583 nfs_display_fhandle_hash(fh),
584 atomic_read(&inode->i_count));
585
586 out:
587 return inode;
588
589 out_no_inode:
590 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
591 goto out;
592 }
593 EXPORT_SYMBOL_GPL(nfs_fhget);
594
595 #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)
596
597 int
598 nfs_setattr(struct dentry *dentry, struct iattr *attr)
599 {
600 struct inode *inode = d_inode(dentry);
601 struct nfs_fattr *fattr;
602 int error = 0;
603
604 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
605
606 /* skip mode change if it's just for clearing setuid/setgid */
607 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
608 attr->ia_valid &= ~ATTR_MODE;
609
610 if (attr->ia_valid & ATTR_SIZE) {
611 BUG_ON(!S_ISREG(inode->i_mode));
612
613 error = inode_newsize_ok(inode, attr->ia_size);
614 if (error)
615 return error;
616
617 if (attr->ia_size == i_size_read(inode))
618 attr->ia_valid &= ~ATTR_SIZE;
619 }
620
621 /* Optimization: if the end result is no change, don't RPC */
622 attr->ia_valid &= NFS_VALID_ATTRS;
623 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
624 return 0;
625
626 trace_nfs_setattr_enter(inode);
627
628 /* Write all dirty data */
629 if (S_ISREG(inode->i_mode))
630 nfs_sync_inode(inode);
631
632 fattr = nfs_alloc_fattr();
633 if (fattr == NULL) {
634 error = -ENOMEM;
635 goto out;
636 }
637
638 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
639 if (error == 0)
640 error = nfs_refresh_inode(inode, fattr);
641 nfs_free_fattr(fattr);
642 out:
643 trace_nfs_setattr_exit(inode, error);
644 return error;
645 }
646 EXPORT_SYMBOL_GPL(nfs_setattr);
647
648 /**
649 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
650 * @inode: inode of the file used
651 * @offset: file offset to start truncating
652 *
653 * This is a copy of the common vmtruncate, but with the locking
654 * corrected to take into account the fact that NFS requires
655 * inode->i_size to be updated under the inode->i_lock.
656 * Note: must be called with inode->i_lock held!
657 */
658 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
659 {
660 int err;
661
662 err = inode_newsize_ok(inode, offset);
663 if (err)
664 goto out;
665
666 i_size_write(inode, offset);
667 /* Optimisation */
668 if (offset == 0)
669 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
670 NFS_INO_DATA_INVAL_DEFER);
671 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
672
673 spin_unlock(&inode->i_lock);
674 truncate_pagecache(inode, offset);
675 spin_lock(&inode->i_lock);
676 out:
677 return err;
678 }
679
680 /**
681 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
682 * @inode: pointer to struct inode
683 * @attr: pointer to struct iattr
684 * @fattr: pointer to struct nfs_fattr
685 *
686 * Note: we do this in the *proc.c in order to ensure that
687 * it works for things like exclusive creates too.
688 */
689 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
690 struct nfs_fattr *fattr)
691 {
692 /* Barrier: bump the attribute generation count. */
693 nfs_fattr_set_barrier(fattr);
694
695 spin_lock(&inode->i_lock);
696 NFS_I(inode)->attr_gencount = fattr->gencount;
697 if ((attr->ia_valid & ATTR_SIZE) != 0) {
698 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
699 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
700 nfs_vmtruncate(inode, attr->ia_size);
701 }
702 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
703 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
704 if ((attr->ia_valid & ATTR_MODE) != 0) {
705 int mode = attr->ia_mode & S_IALLUGO;
706 mode |= inode->i_mode & ~S_IALLUGO;
707 inode->i_mode = mode;
708 }
709 if ((attr->ia_valid & ATTR_UID) != 0)
710 inode->i_uid = attr->ia_uid;
711 if ((attr->ia_valid & ATTR_GID) != 0)
712 inode->i_gid = attr->ia_gid;
713 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
714 inode->i_ctime = fattr->ctime;
715 else
716 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
717 | NFS_INO_INVALID_CTIME);
718 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
719 | NFS_INO_INVALID_ACL);
720 }
721 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
722 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
723 | NFS_INO_INVALID_CTIME);
724 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
725 inode->i_atime = fattr->atime;
726 else if (attr->ia_valid & ATTR_ATIME_SET)
727 inode->i_atime = attr->ia_atime;
728 else
729 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
730
731 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
732 inode->i_ctime = fattr->ctime;
733 else
734 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
735 | NFS_INO_INVALID_CTIME);
736 }
737 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
738 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
739 | NFS_INO_INVALID_CTIME);
740 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
741 inode->i_mtime = fattr->mtime;
742 else if (attr->ia_valid & ATTR_MTIME_SET)
743 inode->i_mtime = attr->ia_mtime;
744 else
745 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
746
747 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
748 inode->i_ctime = fattr->ctime;
749 else
750 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
751 | NFS_INO_INVALID_CTIME);
752 }
753 if (fattr->valid)
754 nfs_update_inode(inode, fattr);
755 spin_unlock(&inode->i_lock);
756 }
757 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
758
759 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
760 {
761 struct dentry *parent;
762
763 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
764 return;
765 parent = dget_parent(dentry);
766 nfs_force_use_readdirplus(d_inode(parent));
767 dput(parent);
768 }
769
770 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
771 {
772 struct dentry *parent;
773
774 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
775 return;
776 parent = dget_parent(dentry);
777 nfs_advise_use_readdirplus(d_inode(parent));
778 dput(parent);
779 }
780
781 static bool nfs_need_revalidate_inode(struct inode *inode)
782 {
783 if (NFS_I(inode)->cache_validity &
784 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
785 return true;
786 if (nfs_attribute_cache_expired(inode))
787 return true;
788 return false;
789 }
790
791 int nfs_getattr(const struct path *path, struct kstat *stat,
792 u32 request_mask, unsigned int query_flags)
793 {
794 struct inode *inode = d_inode(path->dentry);
795 struct nfs_server *server = NFS_SERVER(inode);
796 unsigned long cache_validity;
797 int err = 0;
798 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
799 bool do_update = false;
800
801 trace_nfs_getattr_enter(inode);
802
803 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
804 nfs_readdirplus_parent_cache_hit(path->dentry);
805 goto out_no_update;
806 }
807
808 /* Flush out writes to the server in order to update c/mtime. */
809 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
810 S_ISREG(inode->i_mode)) {
811 err = filemap_write_and_wait(inode->i_mapping);
812 if (err)
813 goto out;
814 }
815
816 /*
817 * We may force a getattr if the user cares about atime.
818 *
819 * Note that we only have to check the vfsmount flags here:
820 * - NFS always sets S_NOATIME by so checking it would give a
821 * bogus result
822 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
823 * no point in checking those.
824 */
825 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
826 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
827 request_mask &= ~STATX_ATIME;
828
829 /* Is the user requesting attributes that might need revalidation? */
830 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
831 STATX_MTIME|STATX_UID|STATX_GID|
832 STATX_SIZE|STATX_BLOCKS)))
833 goto out_no_revalidate;
834
835 /* Check whether the cached attributes are stale */
836 do_update |= force_sync || nfs_attribute_cache_expired(inode);
837 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
838 do_update |= cache_validity &
839 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
840 if (request_mask & STATX_ATIME)
841 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
842 if (request_mask & (STATX_CTIME|STATX_MTIME))
843 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
844 if (request_mask & STATX_BLOCKS)
845 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
846 if (do_update) {
847 /* Update the attribute cache */
848 if (!(server->flags & NFS_MOUNT_NOAC))
849 nfs_readdirplus_parent_cache_miss(path->dentry);
850 else
851 nfs_readdirplus_parent_cache_hit(path->dentry);
852 err = __nfs_revalidate_inode(server, inode);
853 if (err)
854 goto out;
855 } else
856 nfs_readdirplus_parent_cache_hit(path->dentry);
857 out_no_revalidate:
858 /* Only return attributes that were revalidated. */
859 stat->result_mask &= request_mask;
860 out_no_update:
861 generic_fillattr(inode, stat);
862 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
863 if (S_ISDIR(inode->i_mode))
864 stat->blksize = NFS_SERVER(inode)->dtsize;
865 out:
866 trace_nfs_getattr_exit(inode, err);
867 return err;
868 }
869 EXPORT_SYMBOL_GPL(nfs_getattr);
870
871 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
872 {
873 refcount_set(&l_ctx->count, 1);
874 l_ctx->lockowner = current->files;
875 INIT_LIST_HEAD(&l_ctx->list);
876 atomic_set(&l_ctx->io_count, 0);
877 }
878
879 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
880 {
881 struct nfs_lock_context *pos;
882
883 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
884 if (pos->lockowner != current->files)
885 continue;
886 if (refcount_inc_not_zero(&pos->count))
887 return pos;
888 }
889 return NULL;
890 }
891
892 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
893 {
894 struct nfs_lock_context *res, *new = NULL;
895 struct inode *inode = d_inode(ctx->dentry);
896
897 rcu_read_lock();
898 res = __nfs_find_lock_context(ctx);
899 rcu_read_unlock();
900 if (res == NULL) {
901 new = kmalloc(sizeof(*new), GFP_KERNEL);
902 if (new == NULL)
903 return ERR_PTR(-ENOMEM);
904 nfs_init_lock_context(new);
905 spin_lock(&inode->i_lock);
906 res = __nfs_find_lock_context(ctx);
907 if (res == NULL) {
908 new->open_context = get_nfs_open_context(ctx);
909 if (new->open_context) {
910 list_add_tail_rcu(&new->list,
911 &ctx->lock_context.list);
912 res = new;
913 new = NULL;
914 } else
915 res = ERR_PTR(-EBADF);
916 }
917 spin_unlock(&inode->i_lock);
918 kfree(new);
919 }
920 return res;
921 }
922 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
923
924 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
925 {
926 struct nfs_open_context *ctx = l_ctx->open_context;
927 struct inode *inode = d_inode(ctx->dentry);
928
929 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
930 return;
931 list_del_rcu(&l_ctx->list);
932 spin_unlock(&inode->i_lock);
933 put_nfs_open_context(ctx);
934 kfree_rcu(l_ctx, rcu_head);
935 }
936 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
937
938 /**
939 * nfs_close_context - Common close_context() routine NFSv2/v3
940 * @ctx: pointer to context
941 * @is_sync: is this a synchronous close
942 *
943 * Ensure that the attributes are up to date if we're mounted
944 * with close-to-open semantics and we have cached data that will
945 * need to be revalidated on open.
946 */
947 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
948 {
949 struct nfs_inode *nfsi;
950 struct inode *inode;
951 struct nfs_server *server;
952
953 if (!(ctx->mode & FMODE_WRITE))
954 return;
955 if (!is_sync)
956 return;
957 inode = d_inode(ctx->dentry);
958 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
959 return;
960 nfsi = NFS_I(inode);
961 if (inode->i_mapping->nrpages == 0)
962 return;
963 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
964 return;
965 if (!list_empty(&nfsi->open_files))
966 return;
967 server = NFS_SERVER(inode);
968 if (server->flags & NFS_MOUNT_NOCTO)
969 return;
970 nfs_revalidate_inode(server, inode);
971 }
972 EXPORT_SYMBOL_GPL(nfs_close_context);
973
974 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
975 fmode_t f_mode,
976 struct file *filp)
977 {
978 struct nfs_open_context *ctx;
979
980 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
981 if (!ctx)
982 return ERR_PTR(-ENOMEM);
983 nfs_sb_active(dentry->d_sb);
984 ctx->dentry = dget(dentry);
985 if (filp)
986 ctx->cred = get_cred(filp->f_cred);
987 else
988 ctx->cred = get_current_cred();
989 ctx->ll_cred = NULL;
990 ctx->state = NULL;
991 ctx->mode = f_mode;
992 ctx->flags = 0;
993 ctx->error = 0;
994 ctx->flock_owner = (fl_owner_t)filp;
995 nfs_init_lock_context(&ctx->lock_context);
996 ctx->lock_context.open_context = ctx;
997 INIT_LIST_HEAD(&ctx->list);
998 ctx->mdsthreshold = NULL;
999 return ctx;
1000 }
1001 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1002
1003 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1004 {
1005 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1006 return ctx;
1007 return NULL;
1008 }
1009 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1010
1011 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1012 {
1013 struct inode *inode = d_inode(ctx->dentry);
1014 struct super_block *sb = ctx->dentry->d_sb;
1015
1016 if (!refcount_dec_and_test(&ctx->lock_context.count))
1017 return;
1018 if (!list_empty(&ctx->list)) {
1019 spin_lock(&inode->i_lock);
1020 list_del_rcu(&ctx->list);
1021 spin_unlock(&inode->i_lock);
1022 }
1023 if (inode != NULL)
1024 NFS_PROTO(inode)->close_context(ctx, is_sync);
1025 put_cred(ctx->cred);
1026 dput(ctx->dentry);
1027 nfs_sb_deactive(sb);
1028 put_rpccred(ctx->ll_cred);
1029 kfree(ctx->mdsthreshold);
1030 kfree_rcu(ctx, rcu_head);
1031 }
1032
1033 void put_nfs_open_context(struct nfs_open_context *ctx)
1034 {
1035 __put_nfs_open_context(ctx, 0);
1036 }
1037 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1038
1039 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1040 {
1041 __put_nfs_open_context(ctx, 1);
1042 }
1043
1044 /*
1045 * Ensure that mmap has a recent RPC credential for use when writing out
1046 * shared pages
1047 */
1048 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1049 {
1050 struct inode *inode = d_inode(ctx->dentry);
1051 struct nfs_inode *nfsi = NFS_I(inode);
1052
1053 spin_lock(&inode->i_lock);
1054 if (list_empty(&nfsi->open_files) &&
1055 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1056 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1057 NFS_INO_REVAL_FORCED;
1058 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1059 spin_unlock(&inode->i_lock);
1060 }
1061 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1062
1063 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1064 {
1065 filp->private_data = get_nfs_open_context(ctx);
1066 if (list_empty(&ctx->list))
1067 nfs_inode_attach_open_context(ctx);
1068 }
1069 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1070
1071 /*
1072 * Given an inode, search for an open context with the desired characteristics
1073 */
1074 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1075 {
1076 struct nfs_inode *nfsi = NFS_I(inode);
1077 struct nfs_open_context *pos, *ctx = NULL;
1078
1079 rcu_read_lock();
1080 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1081 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1082 continue;
1083 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1084 continue;
1085 ctx = get_nfs_open_context(pos);
1086 if (ctx)
1087 break;
1088 }
1089 rcu_read_unlock();
1090 return ctx;
1091 }
1092
1093 void nfs_file_clear_open_context(struct file *filp)
1094 {
1095 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1096
1097 if (ctx) {
1098 struct inode *inode = d_inode(ctx->dentry);
1099
1100 /*
1101 * We fatal error on write before. Try to writeback
1102 * every page again.
1103 */
1104 if (ctx->error < 0)
1105 invalidate_inode_pages2(inode->i_mapping);
1106 filp->private_data = NULL;
1107 put_nfs_open_context_sync(ctx);
1108 }
1109 }
1110
1111 /*
1112 * These allocate and release file read/write context information.
1113 */
1114 int nfs_open(struct inode *inode, struct file *filp)
1115 {
1116 struct nfs_open_context *ctx;
1117
1118 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1119 if (IS_ERR(ctx))
1120 return PTR_ERR(ctx);
1121 nfs_file_set_open_context(filp, ctx);
1122 put_nfs_open_context(ctx);
1123 nfs_fscache_open_file(inode, filp);
1124 return 0;
1125 }
1126 EXPORT_SYMBOL_GPL(nfs_open);
1127
1128 /*
1129 * This function is called whenever some part of NFS notices that
1130 * the cached attributes have to be refreshed.
1131 */
1132 int
1133 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1134 {
1135 int status = -ESTALE;
1136 struct nfs4_label *label = NULL;
1137 struct nfs_fattr *fattr = NULL;
1138 struct nfs_inode *nfsi = NFS_I(inode);
1139
1140 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1141 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1142
1143 trace_nfs_revalidate_inode_enter(inode);
1144
1145 if (is_bad_inode(inode))
1146 goto out;
1147 if (NFS_STALE(inode))
1148 goto out;
1149
1150 /* pNFS: Attributes aren't updated until we layoutcommit */
1151 if (S_ISREG(inode->i_mode)) {
1152 status = pnfs_sync_inode(inode, false);
1153 if (status)
1154 goto out;
1155 }
1156
1157 status = -ENOMEM;
1158 fattr = nfs_alloc_fattr();
1159 if (fattr == NULL)
1160 goto out;
1161
1162 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1163
1164 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1165 if (IS_ERR(label)) {
1166 status = PTR_ERR(label);
1167 goto out;
1168 }
1169
1170 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1171 label, inode);
1172 if (status != 0) {
1173 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1174 inode->i_sb->s_id,
1175 (unsigned long long)NFS_FILEID(inode), status);
1176 switch (status) {
1177 case -ETIMEDOUT:
1178 /* A soft timeout occurred. Use cached information? */
1179 if (server->flags & NFS_MOUNT_SOFTREVAL)
1180 status = 0;
1181 break;
1182 case -ESTALE:
1183 if (!S_ISDIR(inode->i_mode))
1184 nfs_set_inode_stale(inode);
1185 else
1186 nfs_zap_caches(inode);
1187 }
1188 goto err_out;
1189 }
1190
1191 status = nfs_refresh_inode(inode, fattr);
1192 if (status) {
1193 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1194 inode->i_sb->s_id,
1195 (unsigned long long)NFS_FILEID(inode), status);
1196 goto err_out;
1197 }
1198
1199 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1200 nfs_zap_acl_cache(inode);
1201
1202 nfs_setsecurity(inode, fattr, label);
1203
1204 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1205 inode->i_sb->s_id,
1206 (unsigned long long)NFS_FILEID(inode));
1207
1208 err_out:
1209 nfs4_label_free(label);
1210 out:
1211 nfs_free_fattr(fattr);
1212 trace_nfs_revalidate_inode_exit(inode, status);
1213 return status;
1214 }
1215
1216 int nfs_attribute_cache_expired(struct inode *inode)
1217 {
1218 if (nfs_have_delegated_attributes(inode))
1219 return 0;
1220 return nfs_attribute_timeout(inode);
1221 }
1222
1223 /**
1224 * nfs_revalidate_inode - Revalidate the inode attributes
1225 * @server: pointer to nfs_server struct
1226 * @inode: pointer to inode struct
1227 *
1228 * Updates inode attribute information by retrieving the data from the server.
1229 */
1230 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1231 {
1232 if (!nfs_need_revalidate_inode(inode))
1233 return NFS_STALE(inode) ? -ESTALE : 0;
1234 return __nfs_revalidate_inode(server, inode);
1235 }
1236 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1237
1238 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1239 {
1240 struct nfs_inode *nfsi = NFS_I(inode);
1241 int ret;
1242
1243 if (mapping->nrpages != 0) {
1244 if (S_ISREG(inode->i_mode)) {
1245 ret = nfs_sync_mapping(mapping);
1246 if (ret < 0)
1247 return ret;
1248 }
1249 ret = invalidate_inode_pages2(mapping);
1250 if (ret < 0)
1251 return ret;
1252 }
1253 if (S_ISDIR(inode->i_mode)) {
1254 spin_lock(&inode->i_lock);
1255 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1256 spin_unlock(&inode->i_lock);
1257 }
1258 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1259 nfs_fscache_wait_on_invalidate(inode);
1260
1261 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1262 inode->i_sb->s_id,
1263 (unsigned long long)NFS_FILEID(inode));
1264 return 0;
1265 }
1266
1267 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1268 {
1269 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1270 NFS_STALE(inode);
1271 }
1272
1273 int nfs_revalidate_mapping_rcu(struct inode *inode)
1274 {
1275 struct nfs_inode *nfsi = NFS_I(inode);
1276 unsigned long *bitlock = &nfsi->flags;
1277 int ret = 0;
1278
1279 if (IS_SWAPFILE(inode))
1280 goto out;
1281 if (nfs_mapping_need_revalidate_inode(inode)) {
1282 ret = -ECHILD;
1283 goto out;
1284 }
1285 spin_lock(&inode->i_lock);
1286 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1287 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1288 ret = -ECHILD;
1289 spin_unlock(&inode->i_lock);
1290 out:
1291 return ret;
1292 }
1293
1294 /**
1295 * nfs_revalidate_mapping - Revalidate the pagecache
1296 * @inode: pointer to host inode
1297 * @mapping: pointer to mapping
1298 */
1299 int nfs_revalidate_mapping(struct inode *inode,
1300 struct address_space *mapping)
1301 {
1302 struct nfs_inode *nfsi = NFS_I(inode);
1303 unsigned long *bitlock = &nfsi->flags;
1304 int ret = 0;
1305
1306 /* swapfiles are not supposed to be shared. */
1307 if (IS_SWAPFILE(inode))
1308 goto out;
1309
1310 if (nfs_mapping_need_revalidate_inode(inode)) {
1311 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1312 if (ret < 0)
1313 goto out;
1314 }
1315
1316 /*
1317 * We must clear NFS_INO_INVALID_DATA first to ensure that
1318 * invalidations that come in while we're shooting down the mappings
1319 * are respected. But, that leaves a race window where one revalidator
1320 * can clear the flag, and then another checks it before the mapping
1321 * gets invalidated. Fix that by serializing access to this part of
1322 * the function.
1323 *
1324 * At the same time, we need to allow other tasks to see whether we
1325 * might be in the middle of invalidating the pages, so we only set
1326 * the bit lock here if it looks like we're going to be doing that.
1327 */
1328 for (;;) {
1329 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1330 nfs_wait_bit_killable, TASK_KILLABLE);
1331 if (ret)
1332 goto out;
1333 spin_lock(&inode->i_lock);
1334 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1335 spin_unlock(&inode->i_lock);
1336 continue;
1337 }
1338 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1339 break;
1340 spin_unlock(&inode->i_lock);
1341 goto out;
1342 }
1343
1344 set_bit(NFS_INO_INVALIDATING, bitlock);
1345 smp_wmb();
1346 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1347 NFS_INO_DATA_INVAL_DEFER);
1348 spin_unlock(&inode->i_lock);
1349 trace_nfs_invalidate_mapping_enter(inode);
1350 ret = nfs_invalidate_mapping(inode, mapping);
1351 trace_nfs_invalidate_mapping_exit(inode, ret);
1352
1353 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1354 smp_mb__after_atomic();
1355 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1356 out:
1357 return ret;
1358 }
1359
1360 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1361 {
1362 struct inode *inode = &nfsi->vfs_inode;
1363
1364 if (!S_ISREG(inode->i_mode))
1365 return false;
1366 if (list_empty(&nfsi->open_files))
1367 return false;
1368 return inode_is_open_for_write(inode);
1369 }
1370
1371 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1372 {
1373 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1374 }
1375
1376 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1377 {
1378 struct timespec64 ts;
1379
1380 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1381 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1382 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1383 inode_set_iversion_raw(inode, fattr->change_attr);
1384 if (S_ISDIR(inode->i_mode))
1385 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1386 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1387 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1388 }
1389 /* If we have atomic WCC data, we may update some attributes */
1390 ts = inode->i_ctime;
1391 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1392 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1393 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1394 inode->i_ctime = fattr->ctime;
1395 }
1396
1397 ts = inode->i_mtime;
1398 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1399 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1400 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1401 inode->i_mtime = fattr->mtime;
1402 if (S_ISDIR(inode->i_mode))
1403 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1404 }
1405 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1406 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1407 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1408 && !nfs_have_writebacks(inode)) {
1409 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1410 }
1411 }
1412
1413 /**
1414 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1415 * @inode: pointer to inode
1416 * @fattr: updated attributes
1417 *
1418 * Verifies the attribute cache. If we have just changed the attributes,
1419 * so that fattr carries weak cache consistency data, then it may
1420 * also update the ctime/mtime/change_attribute.
1421 */
1422 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1423 {
1424 struct nfs_inode *nfsi = NFS_I(inode);
1425 loff_t cur_size, new_isize;
1426 unsigned long invalid = 0;
1427 struct timespec64 ts;
1428
1429 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1430 return 0;
1431
1432 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1433 /* Only a mounted-on-fileid? Just exit */
1434 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1435 return 0;
1436 /* Has the inode gone and changed behind our back? */
1437 } else if (nfsi->fileid != fattr->fileid) {
1438 /* Is this perhaps the mounted-on fileid? */
1439 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1440 nfsi->fileid == fattr->mounted_on_fileid)
1441 return 0;
1442 return -ESTALE;
1443 }
1444 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1445 return -ESTALE;
1446
1447
1448 if (!nfs_file_has_buffered_writers(nfsi)) {
1449 /* Verify a few of the more important attributes */
1450 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1451 invalid |= NFS_INO_INVALID_CHANGE
1452 | NFS_INO_REVAL_PAGECACHE;
1453
1454 ts = inode->i_mtime;
1455 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1456 invalid |= NFS_INO_INVALID_MTIME;
1457
1458 ts = inode->i_ctime;
1459 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1460 invalid |= NFS_INO_INVALID_CTIME;
1461
1462 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1463 cur_size = i_size_read(inode);
1464 new_isize = nfs_size_to_loff_t(fattr->size);
1465 if (cur_size != new_isize)
1466 invalid |= NFS_INO_INVALID_SIZE
1467 | NFS_INO_REVAL_PAGECACHE;
1468 }
1469 }
1470
1471 /* Have any file permissions changed? */
1472 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1473 invalid |= NFS_INO_INVALID_ACCESS
1474 | NFS_INO_INVALID_ACL
1475 | NFS_INO_INVALID_OTHER;
1476 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1477 invalid |= NFS_INO_INVALID_ACCESS
1478 | NFS_INO_INVALID_ACL
1479 | NFS_INO_INVALID_OTHER;
1480 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1481 invalid |= NFS_INO_INVALID_ACCESS
1482 | NFS_INO_INVALID_ACL
1483 | NFS_INO_INVALID_OTHER;
1484
1485 /* Has the link count changed? */
1486 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1487 invalid |= NFS_INO_INVALID_OTHER;
1488
1489 ts = inode->i_atime;
1490 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1491 invalid |= NFS_INO_INVALID_ATIME;
1492
1493 if (invalid != 0)
1494 nfs_set_cache_invalid(inode, invalid);
1495
1496 nfsi->read_cache_jiffies = fattr->time_start;
1497 return 0;
1498 }
1499
1500 static atomic_long_t nfs_attr_generation_counter;
1501
1502 static unsigned long nfs_read_attr_generation_counter(void)
1503 {
1504 return atomic_long_read(&nfs_attr_generation_counter);
1505 }
1506
1507 unsigned long nfs_inc_attr_generation_counter(void)
1508 {
1509 return atomic_long_inc_return(&nfs_attr_generation_counter);
1510 }
1511 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1512
1513 void nfs_fattr_init(struct nfs_fattr *fattr)
1514 {
1515 fattr->valid = 0;
1516 fattr->time_start = jiffies;
1517 fattr->gencount = nfs_inc_attr_generation_counter();
1518 fattr->owner_name = NULL;
1519 fattr->group_name = NULL;
1520 }
1521 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1522
1523 /**
1524 * nfs_fattr_set_barrier
1525 * @fattr: attributes
1526 *
1527 * Used to set a barrier after an attribute was updated. This
1528 * barrier ensures that older attributes from RPC calls that may
1529 * have raced with our update cannot clobber these new values.
1530 * Note that you are still responsible for ensuring that other
1531 * operations which change the attribute on the server do not
1532 * collide.
1533 */
1534 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1535 {
1536 fattr->gencount = nfs_inc_attr_generation_counter();
1537 }
1538
1539 struct nfs_fattr *nfs_alloc_fattr(void)
1540 {
1541 struct nfs_fattr *fattr;
1542
1543 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1544 if (fattr != NULL)
1545 nfs_fattr_init(fattr);
1546 return fattr;
1547 }
1548 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1549
1550 struct nfs_fh *nfs_alloc_fhandle(void)
1551 {
1552 struct nfs_fh *fh;
1553
1554 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1555 if (fh != NULL)
1556 fh->size = 0;
1557 return fh;
1558 }
1559 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1560
1561 #ifdef NFS_DEBUG
1562 /*
1563 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1564 * in the same way that wireshark does
1565 *
1566 * @fh: file handle
1567 *
1568 * For debugging only.
1569 */
1570 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1571 {
1572 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1573 * not on the result */
1574 return nfs_fhandle_hash(fh);
1575 }
1576 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1577
1578 /*
1579 * _nfs_display_fhandle - display an NFS file handle on the console
1580 *
1581 * @fh: file handle to display
1582 * @caption: display caption
1583 *
1584 * For debugging only.
1585 */
1586 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1587 {
1588 unsigned short i;
1589
1590 if (fh == NULL || fh->size == 0) {
1591 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1592 return;
1593 }
1594
1595 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1596 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1597 for (i = 0; i < fh->size; i += 16) {
1598 __be32 *pos = (__be32 *)&fh->data[i];
1599
1600 switch ((fh->size - i - 1) >> 2) {
1601 case 0:
1602 printk(KERN_DEFAULT " %08x\n",
1603 be32_to_cpup(pos));
1604 break;
1605 case 1:
1606 printk(KERN_DEFAULT " %08x %08x\n",
1607 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1608 break;
1609 case 2:
1610 printk(KERN_DEFAULT " %08x %08x %08x\n",
1611 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1612 be32_to_cpup(pos + 2));
1613 break;
1614 default:
1615 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1616 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1617 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1618 }
1619 }
1620 }
1621 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1622 #endif
1623
1624 /**
1625 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1626 * @inode: pointer to inode
1627 * @fattr: attributes
1628 *
1629 * Attempt to divine whether or not an RPC call reply carrying stale
1630 * attributes got scheduled after another call carrying updated ones.
1631 *
1632 * To do so, the function first assumes that a more recent ctime means
1633 * that the attributes in fattr are newer, however it also attempt to
1634 * catch the case where ctime either didn't change, or went backwards
1635 * (if someone reset the clock on the server) by looking at whether
1636 * or not this RPC call was started after the inode was last updated.
1637 * Note also the check for wraparound of 'attr_gencount'
1638 *
1639 * The function returns 'true' if it thinks the attributes in 'fattr' are
1640 * more recent than the ones cached in the inode.
1641 *
1642 */
1643 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1644 {
1645 const struct nfs_inode *nfsi = NFS_I(inode);
1646
1647 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1648 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1649 }
1650
1651 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1652 {
1653 int ret;
1654
1655 trace_nfs_refresh_inode_enter(inode);
1656
1657 if (nfs_inode_attrs_need_update(inode, fattr))
1658 ret = nfs_update_inode(inode, fattr);
1659 else
1660 ret = nfs_check_inode_attributes(inode, fattr);
1661
1662 trace_nfs_refresh_inode_exit(inode, ret);
1663 return ret;
1664 }
1665
1666 /**
1667 * nfs_refresh_inode - try to update the inode attribute cache
1668 * @inode: pointer to inode
1669 * @fattr: updated attributes
1670 *
1671 * Check that an RPC call that returned attributes has not overlapped with
1672 * other recent updates of the inode metadata, then decide whether it is
1673 * safe to do a full update of the inode attributes, or whether just to
1674 * call nfs_check_inode_attributes.
1675 */
1676 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1677 {
1678 int status;
1679
1680 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1681 return 0;
1682 spin_lock(&inode->i_lock);
1683 status = nfs_refresh_inode_locked(inode, fattr);
1684 spin_unlock(&inode->i_lock);
1685
1686 return status;
1687 }
1688 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1689
1690 static int nfs_post_op_update_inode_locked(struct inode *inode,
1691 struct nfs_fattr *fattr, unsigned int invalid)
1692 {
1693 if (S_ISDIR(inode->i_mode))
1694 invalid |= NFS_INO_INVALID_DATA;
1695 nfs_set_cache_invalid(inode, invalid);
1696 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1697 return 0;
1698 return nfs_refresh_inode_locked(inode, fattr);
1699 }
1700
1701 /**
1702 * nfs_post_op_update_inode - try to update the inode attribute cache
1703 * @inode: pointer to inode
1704 * @fattr: updated attributes
1705 *
1706 * After an operation that has changed the inode metadata, mark the
1707 * attribute cache as being invalid, then try to update it.
1708 *
1709 * NB: if the server didn't return any post op attributes, this
1710 * function will force the retrieval of attributes before the next
1711 * NFS request. Thus it should be used only for operations that
1712 * are expected to change one or more attributes, to avoid
1713 * unnecessary NFS requests and trips through nfs_update_inode().
1714 */
1715 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1716 {
1717 int status;
1718
1719 spin_lock(&inode->i_lock);
1720 nfs_fattr_set_barrier(fattr);
1721 status = nfs_post_op_update_inode_locked(inode, fattr,
1722 NFS_INO_INVALID_CHANGE
1723 | NFS_INO_INVALID_CTIME
1724 | NFS_INO_REVAL_FORCED);
1725 spin_unlock(&inode->i_lock);
1726
1727 return status;
1728 }
1729 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1730
1731 /**
1732 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1733 * @inode: pointer to inode
1734 * @fattr: updated attributes
1735 *
1736 * After an operation that has changed the inode metadata, mark the
1737 * attribute cache as being invalid, then try to update it. Fake up
1738 * weak cache consistency data, if none exist.
1739 *
1740 * This function is mainly designed to be used by the ->write_done() functions.
1741 */
1742 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1743 {
1744 int status;
1745
1746 /* Don't do a WCC update if these attributes are already stale */
1747 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1748 !nfs_inode_attrs_need_update(inode, fattr)) {
1749 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1750 | NFS_ATTR_FATTR_PRESIZE
1751 | NFS_ATTR_FATTR_PREMTIME
1752 | NFS_ATTR_FATTR_PRECTIME);
1753 goto out_noforce;
1754 }
1755 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1756 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1757 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1758 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1759 }
1760 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1761 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1762 fattr->pre_ctime = inode->i_ctime;
1763 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1764 }
1765 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1766 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1767 fattr->pre_mtime = inode->i_mtime;
1768 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1769 }
1770 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1771 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1772 fattr->pre_size = i_size_read(inode);
1773 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1774 }
1775 out_noforce:
1776 status = nfs_post_op_update_inode_locked(inode, fattr,
1777 NFS_INO_INVALID_CHANGE
1778 | NFS_INO_INVALID_CTIME
1779 | NFS_INO_INVALID_MTIME
1780 | NFS_INO_INVALID_BLOCKS);
1781 return status;
1782 }
1783
1784 /**
1785 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1786 * @inode: pointer to inode
1787 * @fattr: updated attributes
1788 *
1789 * After an operation that has changed the inode metadata, mark the
1790 * attribute cache as being invalid, then try to update it. Fake up
1791 * weak cache consistency data, if none exist.
1792 *
1793 * This function is mainly designed to be used by the ->write_done() functions.
1794 */
1795 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1796 {
1797 int status;
1798
1799 spin_lock(&inode->i_lock);
1800 nfs_fattr_set_barrier(fattr);
1801 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1802 spin_unlock(&inode->i_lock);
1803 return status;
1804 }
1805 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1806
1807
1808 /*
1809 * Many nfs protocol calls return the new file attributes after
1810 * an operation. Here we update the inode to reflect the state
1811 * of the server's inode.
1812 *
1813 * This is a bit tricky because we have to make sure all dirty pages
1814 * have been sent off to the server before calling invalidate_inode_pages.
1815 * To make sure no other process adds more write requests while we try
1816 * our best to flush them, we make them sleep during the attribute refresh.
1817 *
1818 * A very similar scenario holds for the dir cache.
1819 */
1820 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1821 {
1822 struct nfs_server *server;
1823 struct nfs_inode *nfsi = NFS_I(inode);
1824 loff_t cur_isize, new_isize;
1825 unsigned long invalid = 0;
1826 unsigned long now = jiffies;
1827 unsigned long save_cache_validity;
1828 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1829 bool cache_revalidated = true;
1830 bool attr_changed = false;
1831 bool have_delegation;
1832
1833 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1834 __func__, inode->i_sb->s_id, inode->i_ino,
1835 nfs_display_fhandle_hash(NFS_FH(inode)),
1836 atomic_read(&inode->i_count), fattr->valid);
1837
1838 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1839 /* Only a mounted-on-fileid? Just exit */
1840 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1841 return 0;
1842 /* Has the inode gone and changed behind our back? */
1843 } else if (nfsi->fileid != fattr->fileid) {
1844 /* Is this perhaps the mounted-on fileid? */
1845 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1846 nfsi->fileid == fattr->mounted_on_fileid)
1847 return 0;
1848 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1849 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1850 NFS_SERVER(inode)->nfs_client->cl_hostname,
1851 inode->i_sb->s_id, (long long)nfsi->fileid,
1852 (long long)fattr->fileid);
1853 goto out_err;
1854 }
1855
1856 /*
1857 * Make sure the inode's type hasn't changed.
1858 */
1859 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1860 /*
1861 * Big trouble! The inode has become a different object.
1862 */
1863 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1864 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1865 goto out_err;
1866 }
1867
1868 server = NFS_SERVER(inode);
1869 /* Update the fsid? */
1870 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1871 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1872 !IS_AUTOMOUNT(inode))
1873 server->fsid = fattr->fsid;
1874
1875 /* Save the delegation state before clearing cache_validity */
1876 have_delegation = nfs_have_delegated_attributes(inode);
1877
1878 /*
1879 * Update the read time so we don't revalidate too often.
1880 */
1881 nfsi->read_cache_jiffies = fattr->time_start;
1882
1883 save_cache_validity = nfsi->cache_validity;
1884 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1885 | NFS_INO_INVALID_ATIME
1886 | NFS_INO_REVAL_FORCED
1887 | NFS_INO_REVAL_PAGECACHE
1888 | NFS_INO_INVALID_BLOCKS);
1889
1890 /* Do atomic weak cache consistency updates */
1891 nfs_wcc_update_inode(inode, fattr);
1892
1893 if (pnfs_layoutcommit_outstanding(inode)) {
1894 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1895 cache_revalidated = false;
1896 }
1897
1898 /* More cache consistency checks */
1899 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1900 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1901 /* Could it be a race with writeback? */
1902 if (!(have_writers || have_delegation)) {
1903 invalid |= NFS_INO_INVALID_DATA
1904 | NFS_INO_INVALID_ACCESS
1905 | NFS_INO_INVALID_ACL
1906 | NFS_INO_INVALID_XATTR;
1907 /* Force revalidate of all attributes */
1908 save_cache_validity |= NFS_INO_INVALID_CTIME
1909 | NFS_INO_INVALID_MTIME
1910 | NFS_INO_INVALID_SIZE
1911 | NFS_INO_INVALID_OTHER;
1912 if (S_ISDIR(inode->i_mode))
1913 nfs_force_lookup_revalidate(inode);
1914 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1915 inode->i_sb->s_id,
1916 inode->i_ino);
1917 } else if (!have_delegation)
1918 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1919 inode_set_iversion_raw(inode, fattr->change_attr);
1920 attr_changed = true;
1921 }
1922 } else {
1923 nfsi->cache_validity |= save_cache_validity &
1924 (NFS_INO_INVALID_CHANGE
1925 | NFS_INO_REVAL_PAGECACHE
1926 | NFS_INO_REVAL_FORCED);
1927 cache_revalidated = false;
1928 }
1929
1930 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1931 inode->i_mtime = fattr->mtime;
1932 } else if (server->caps & NFS_CAP_MTIME) {
1933 nfsi->cache_validity |= save_cache_validity &
1934 (NFS_INO_INVALID_MTIME
1935 | NFS_INO_REVAL_FORCED);
1936 cache_revalidated = false;
1937 }
1938
1939 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1940 inode->i_ctime = fattr->ctime;
1941 } else if (server->caps & NFS_CAP_CTIME) {
1942 nfsi->cache_validity |= save_cache_validity &
1943 (NFS_INO_INVALID_CTIME
1944 | NFS_INO_REVAL_FORCED);
1945 cache_revalidated = false;
1946 }
1947
1948 /* Check if our cached file size is stale */
1949 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1950 new_isize = nfs_size_to_loff_t(fattr->size);
1951 cur_isize = i_size_read(inode);
1952 if (new_isize != cur_isize && !have_delegation) {
1953 /* Do we perhaps have any outstanding writes, or has
1954 * the file grown beyond our last write? */
1955 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1956 i_size_write(inode, new_isize);
1957 if (!have_writers)
1958 invalid |= NFS_INO_INVALID_DATA;
1959 attr_changed = true;
1960 }
1961 dprintk("NFS: isize change on server for file %s/%ld "
1962 "(%Ld to %Ld)\n",
1963 inode->i_sb->s_id,
1964 inode->i_ino,
1965 (long long)cur_isize,
1966 (long long)new_isize);
1967 }
1968 } else {
1969 nfsi->cache_validity |= save_cache_validity &
1970 (NFS_INO_INVALID_SIZE
1971 | NFS_INO_REVAL_PAGECACHE
1972 | NFS_INO_REVAL_FORCED);
1973 cache_revalidated = false;
1974 }
1975
1976
1977 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1978 inode->i_atime = fattr->atime;
1979 else if (server->caps & NFS_CAP_ATIME) {
1980 nfsi->cache_validity |= save_cache_validity &
1981 (NFS_INO_INVALID_ATIME
1982 | NFS_INO_REVAL_FORCED);
1983 cache_revalidated = false;
1984 }
1985
1986 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1987 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1988 umode_t newmode = inode->i_mode & S_IFMT;
1989 newmode |= fattr->mode & S_IALLUGO;
1990 inode->i_mode = newmode;
1991 invalid |= NFS_INO_INVALID_ACCESS
1992 | NFS_INO_INVALID_ACL;
1993 attr_changed = true;
1994 }
1995 } else if (server->caps & NFS_CAP_MODE) {
1996 nfsi->cache_validity |= save_cache_validity &
1997 (NFS_INO_INVALID_OTHER
1998 | NFS_INO_REVAL_FORCED);
1999 cache_revalidated = false;
2000 }
2001
2002 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2003 if (!uid_eq(inode->i_uid, fattr->uid)) {
2004 invalid |= NFS_INO_INVALID_ACCESS
2005 | NFS_INO_INVALID_ACL;
2006 inode->i_uid = fattr->uid;
2007 attr_changed = true;
2008 }
2009 } else if (server->caps & NFS_CAP_OWNER) {
2010 nfsi->cache_validity |= save_cache_validity &
2011 (NFS_INO_INVALID_OTHER
2012 | NFS_INO_REVAL_FORCED);
2013 cache_revalidated = false;
2014 }
2015
2016 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2017 if (!gid_eq(inode->i_gid, fattr->gid)) {
2018 invalid |= NFS_INO_INVALID_ACCESS
2019 | NFS_INO_INVALID_ACL;
2020 inode->i_gid = fattr->gid;
2021 attr_changed = true;
2022 }
2023 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
2024 nfsi->cache_validity |= save_cache_validity &
2025 (NFS_INO_INVALID_OTHER
2026 | NFS_INO_REVAL_FORCED);
2027 cache_revalidated = false;
2028 }
2029
2030 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2031 if (inode->i_nlink != fattr->nlink) {
2032 if (S_ISDIR(inode->i_mode))
2033 invalid |= NFS_INO_INVALID_DATA;
2034 set_nlink(inode, fattr->nlink);
2035 attr_changed = true;
2036 }
2037 } else if (server->caps & NFS_CAP_NLINK) {
2038 nfsi->cache_validity |= save_cache_validity &
2039 (NFS_INO_INVALID_OTHER
2040 | NFS_INO_REVAL_FORCED);
2041 cache_revalidated = false;
2042 }
2043
2044 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2045 /*
2046 * report the blocks in 512byte units
2047 */
2048 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2049 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2050 inode->i_blocks = fattr->du.nfs2.blocks;
2051 else {
2052 nfsi->cache_validity |= save_cache_validity &
2053 (NFS_INO_INVALID_BLOCKS
2054 | NFS_INO_REVAL_FORCED);
2055 cache_revalidated = false;
2056 }
2057
2058 /* Update attrtimeo value if we're out of the unstable period */
2059 if (attr_changed) {
2060 invalid &= ~NFS_INO_INVALID_ATTR;
2061 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2062 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2063 nfsi->attrtimeo_timestamp = now;
2064 /* Set barrier to be more recent than all outstanding updates */
2065 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2066 } else {
2067 if (cache_revalidated) {
2068 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2069 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2070 nfsi->attrtimeo <<= 1;
2071 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2072 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2073 }
2074 nfsi->attrtimeo_timestamp = now;
2075 }
2076 /* Set the barrier to be more recent than this fattr */
2077 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2078 nfsi->attr_gencount = fattr->gencount;
2079 }
2080
2081 /* Don't invalidate the data if we were to blame */
2082 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2083 || S_ISLNK(inode->i_mode)))
2084 invalid &= ~NFS_INO_INVALID_DATA;
2085 nfs_set_cache_invalid(inode, invalid);
2086
2087 return 0;
2088 out_err:
2089 /*
2090 * No need to worry about unhashing the dentry, as the
2091 * lookup validation will know that the inode is bad.
2092 * (But we fall through to invalidate the caches.)
2093 */
2094 nfs_set_inode_stale_locked(inode);
2095 return -ESTALE;
2096 }
2097
2098 struct inode *nfs_alloc_inode(struct super_block *sb)
2099 {
2100 struct nfs_inode *nfsi;
2101 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2102 if (!nfsi)
2103 return NULL;
2104 nfsi->flags = 0UL;
2105 nfsi->cache_validity = 0UL;
2106 #if IS_ENABLED(CONFIG_NFS_V4)
2107 nfsi->nfs4_acl = NULL;
2108 #endif /* CONFIG_NFS_V4 */
2109 #ifdef CONFIG_NFS_V4_2
2110 nfsi->xattr_cache = NULL;
2111 #endif
2112 return &nfsi->vfs_inode;
2113 }
2114 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2115
2116 void nfs_free_inode(struct inode *inode)
2117 {
2118 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2119 }
2120 EXPORT_SYMBOL_GPL(nfs_free_inode);
2121
2122 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2123 {
2124 #if IS_ENABLED(CONFIG_NFS_V4)
2125 INIT_LIST_HEAD(&nfsi->open_states);
2126 nfsi->delegation = NULL;
2127 init_rwsem(&nfsi->rwsem);
2128 nfsi->layout = NULL;
2129 #endif
2130 }
2131
2132 static void init_once(void *foo)
2133 {
2134 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2135
2136 inode_init_once(&nfsi->vfs_inode);
2137 INIT_LIST_HEAD(&nfsi->open_files);
2138 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2139 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2140 INIT_LIST_HEAD(&nfsi->commit_info.list);
2141 atomic_long_set(&nfsi->nrequests, 0);
2142 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2143 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2144 init_rwsem(&nfsi->rmdir_sem);
2145 mutex_init(&nfsi->commit_mutex);
2146 nfs4_init_once(nfsi);
2147 nfsi->cache_change_attribute = 0;
2148 }
2149
2150 static int __init nfs_init_inodecache(void)
2151 {
2152 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2153 sizeof(struct nfs_inode),
2154 0, (SLAB_RECLAIM_ACCOUNT|
2155 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2156 init_once);
2157 if (nfs_inode_cachep == NULL)
2158 return -ENOMEM;
2159
2160 return 0;
2161 }
2162
2163 static void nfs_destroy_inodecache(void)
2164 {
2165 /*
2166 * Make sure all delayed rcu free inodes are flushed before we
2167 * destroy cache.
2168 */
2169 rcu_barrier();
2170 kmem_cache_destroy(nfs_inode_cachep);
2171 }
2172
2173 struct workqueue_struct *nfsiod_workqueue;
2174 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2175
2176 /*
2177 * start up the nfsiod workqueue
2178 */
2179 static int nfsiod_start(void)
2180 {
2181 struct workqueue_struct *wq;
2182 dprintk("RPC: creating workqueue nfsiod\n");
2183 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2184 if (wq == NULL)
2185 return -ENOMEM;
2186 nfsiod_workqueue = wq;
2187 return 0;
2188 }
2189
2190 /*
2191 * Destroy the nfsiod workqueue
2192 */
2193 static void nfsiod_stop(void)
2194 {
2195 struct workqueue_struct *wq;
2196
2197 wq = nfsiod_workqueue;
2198 if (wq == NULL)
2199 return;
2200 nfsiod_workqueue = NULL;
2201 destroy_workqueue(wq);
2202 }
2203
2204 unsigned int nfs_net_id;
2205 EXPORT_SYMBOL_GPL(nfs_net_id);
2206
2207 static int nfs_net_init(struct net *net)
2208 {
2209 nfs_clients_init(net);
2210 return nfs_fs_proc_net_init(net);
2211 }
2212
2213 static void nfs_net_exit(struct net *net)
2214 {
2215 nfs_fs_proc_net_exit(net);
2216 nfs_clients_exit(net);
2217 }
2218
2219 static struct pernet_operations nfs_net_ops = {
2220 .init = nfs_net_init,
2221 .exit = nfs_net_exit,
2222 .id = &nfs_net_id,
2223 .size = sizeof(struct nfs_net),
2224 };
2225
2226 /*
2227 * Initialize NFS
2228 */
2229 static int __init init_nfs_fs(void)
2230 {
2231 int err;
2232
2233 err = nfs_sysfs_init();
2234 if (err < 0)
2235 goto out10;
2236
2237 err = register_pernet_subsys(&nfs_net_ops);
2238 if (err < 0)
2239 goto out9;
2240
2241 err = nfs_fscache_register();
2242 if (err < 0)
2243 goto out8;
2244
2245 err = nfsiod_start();
2246 if (err)
2247 goto out7;
2248
2249 err = nfs_fs_proc_init();
2250 if (err)
2251 goto out6;
2252
2253 err = nfs_init_nfspagecache();
2254 if (err)
2255 goto out5;
2256
2257 err = nfs_init_inodecache();
2258 if (err)
2259 goto out4;
2260
2261 err = nfs_init_readpagecache();
2262 if (err)
2263 goto out3;
2264
2265 err = nfs_init_writepagecache();
2266 if (err)
2267 goto out2;
2268
2269 err = nfs_init_directcache();
2270 if (err)
2271 goto out1;
2272
2273 rpc_proc_register(&init_net, &nfs_rpcstat);
2274
2275 err = register_nfs_fs();
2276 if (err)
2277 goto out0;
2278
2279 return 0;
2280 out0:
2281 rpc_proc_unregister(&init_net, "nfs");
2282 nfs_destroy_directcache();
2283 out1:
2284 nfs_destroy_writepagecache();
2285 out2:
2286 nfs_destroy_readpagecache();
2287 out3:
2288 nfs_destroy_inodecache();
2289 out4:
2290 nfs_destroy_nfspagecache();
2291 out5:
2292 nfs_fs_proc_exit();
2293 out6:
2294 nfsiod_stop();
2295 out7:
2296 nfs_fscache_unregister();
2297 out8:
2298 unregister_pernet_subsys(&nfs_net_ops);
2299 out9:
2300 nfs_sysfs_exit();
2301 out10:
2302 return err;
2303 }
2304
2305 static void __exit exit_nfs_fs(void)
2306 {
2307 nfs_destroy_directcache();
2308 nfs_destroy_writepagecache();
2309 nfs_destroy_readpagecache();
2310 nfs_destroy_inodecache();
2311 nfs_destroy_nfspagecache();
2312 nfs_fscache_unregister();
2313 unregister_pernet_subsys(&nfs_net_ops);
2314 rpc_proc_unregister(&init_net, "nfs");
2315 unregister_nfs_fs();
2316 nfs_fs_proc_exit();
2317 nfsiod_stop();
2318 nfs_sysfs_exit();
2319 }
2320
2321 /* Not quite true; I just maintain it */
2322 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2323 MODULE_LICENSE("GPL");
2324 module_param(enable_ino64, bool, 0644);
2325
2326 module_init(init_nfs_fs)
2327 module_exit(exit_nfs_fs)
Linux with added FPC-III support