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vfs: change inode times to use struct timespec64
[thirdparty/linux.git] / fs / nfs / inode.c
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_have_delegated_attributes(inode);
199
200 if (have_delegation)
201 flags &= ~(NFS_INO_INVALID_CHANGE|NFS_INO_REVAL_PAGECACHE);
202 if (inode->i_mapping->nrpages == 0)
203 flags &= ~NFS_INO_INVALID_DATA;
204 nfsi->cache_validity |= flags;
205 if (flags & NFS_INO_INVALID_DATA)
206 nfs_fscache_invalidate(inode);
207 }
208
209 /*
210 * Invalidate the local caches
211 */
212 static void nfs_zap_caches_locked(struct inode *inode)
213 {
214 struct nfs_inode *nfsi = NFS_I(inode);
215 int mode = inode->i_mode;
216
217 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
218
219 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
220 nfsi->attrtimeo_timestamp = jiffies;
221
222 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
223 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
224 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
225 | NFS_INO_INVALID_DATA
226 | NFS_INO_INVALID_ACCESS
227 | NFS_INO_INVALID_ACL
228 | NFS_INO_REVAL_PAGECACHE);
229 } else
230 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
231 | NFS_INO_INVALID_ACCESS
232 | NFS_INO_INVALID_ACL
233 | NFS_INO_REVAL_PAGECACHE);
234 nfs_zap_label_cache_locked(nfsi);
235 }
236
237 void nfs_zap_caches(struct inode *inode)
238 {
239 spin_lock(&inode->i_lock);
240 nfs_zap_caches_locked(inode);
241 spin_unlock(&inode->i_lock);
242 }
243
244 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
245 {
246 if (mapping->nrpages != 0) {
247 spin_lock(&inode->i_lock);
248 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
249 spin_unlock(&inode->i_lock);
250 }
251 }
252
253 void nfs_zap_acl_cache(struct inode *inode)
254 {
255 void (*clear_acl_cache)(struct inode *);
256
257 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
258 if (clear_acl_cache != NULL)
259 clear_acl_cache(inode);
260 spin_lock(&inode->i_lock);
261 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
262 spin_unlock(&inode->i_lock);
263 }
264 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
265
266 void nfs_invalidate_atime(struct inode *inode)
267 {
268 spin_lock(&inode->i_lock);
269 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
270 spin_unlock(&inode->i_lock);
271 }
272 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
273
274 /*
275 * Invalidate, but do not unhash, the inode.
276 * NB: must be called with inode->i_lock held!
277 */
278 static void nfs_invalidate_inode(struct inode *inode)
279 {
280 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
281 nfs_zap_caches_locked(inode);
282 }
283
284 struct nfs_find_desc {
285 struct nfs_fh *fh;
286 struct nfs_fattr *fattr;
287 };
288
289 /*
290 * In NFSv3 we can have 64bit inode numbers. In order to support
291 * this, and re-exported directories (also seen in NFSv2)
292 * we are forced to allow 2 different inodes to have the same
293 * i_ino.
294 */
295 static int
296 nfs_find_actor(struct inode *inode, void *opaque)
297 {
298 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
299 struct nfs_fh *fh = desc->fh;
300 struct nfs_fattr *fattr = desc->fattr;
301
302 if (NFS_FILEID(inode) != fattr->fileid)
303 return 0;
304 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
305 return 0;
306 if (nfs_compare_fh(NFS_FH(inode), fh))
307 return 0;
308 if (is_bad_inode(inode) || NFS_STALE(inode))
309 return 0;
310 return 1;
311 }
312
313 static int
314 nfs_init_locked(struct inode *inode, void *opaque)
315 {
316 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
317 struct nfs_fattr *fattr = desc->fattr;
318
319 set_nfs_fileid(inode, fattr->fileid);
320 inode->i_mode = fattr->mode;
321 nfs_copy_fh(NFS_FH(inode), desc->fh);
322 return 0;
323 }
324
325 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
326 static void nfs_clear_label_invalid(struct inode *inode)
327 {
328 spin_lock(&inode->i_lock);
329 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
330 spin_unlock(&inode->i_lock);
331 }
332
333 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
334 struct nfs4_label *label)
335 {
336 int error;
337
338 if (label == NULL)
339 return;
340
341 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
342 error = security_inode_notifysecctx(inode, label->label,
343 label->len);
344 if (error)
345 printk(KERN_ERR "%s() %s %d "
346 "security_inode_notifysecctx() %d\n",
347 __func__,
348 (char *)label->label,
349 label->len, error);
350 nfs_clear_label_invalid(inode);
351 }
352 }
353
354 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
355 {
356 struct nfs4_label *label = NULL;
357 int minor_version = server->nfs_client->cl_minorversion;
358
359 if (minor_version < 2)
360 return label;
361
362 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
363 return label;
364
365 label = kzalloc(sizeof(struct nfs4_label), flags);
366 if (label == NULL)
367 return ERR_PTR(-ENOMEM);
368
369 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
370 if (label->label == NULL) {
371 kfree(label);
372 return ERR_PTR(-ENOMEM);
373 }
374 label->len = NFS4_MAXLABELLEN;
375
376 return label;
377 }
378 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
379 #else
380 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
381 struct nfs4_label *label)
382 {
383 }
384 #endif
385 EXPORT_SYMBOL_GPL(nfs_setsecurity);
386
387 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
388 struct inode *
389 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
390 {
391 struct nfs_find_desc desc = {
392 .fh = fh,
393 .fattr = fattr,
394 };
395 struct inode *inode;
396 unsigned long hash;
397
398 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
399 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
400 return NULL;
401
402 hash = nfs_fattr_to_ino_t(fattr);
403 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
404
405 dprintk("%s: returning %p\n", __func__, inode);
406 return inode;
407 }
408
409 /*
410 * This is our front-end to iget that looks up inodes by file handle
411 * instead of inode number.
412 */
413 struct inode *
414 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
415 {
416 struct nfs_find_desc desc = {
417 .fh = fh,
418 .fattr = fattr
419 };
420 struct inode *inode = ERR_PTR(-ENOENT);
421 unsigned long hash;
422
423 nfs_attr_check_mountpoint(sb, fattr);
424
425 if (nfs_attr_use_mounted_on_fileid(fattr))
426 fattr->fileid = fattr->mounted_on_fileid;
427 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
428 goto out_no_inode;
429 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
430 goto out_no_inode;
431
432 hash = nfs_fattr_to_ino_t(fattr);
433
434 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
435 if (inode == NULL) {
436 inode = ERR_PTR(-ENOMEM);
437 goto out_no_inode;
438 }
439
440 if (inode->i_state & I_NEW) {
441 struct nfs_inode *nfsi = NFS_I(inode);
442 unsigned long now = jiffies;
443
444 /* We set i_ino for the few things that still rely on it,
445 * such as stat(2) */
446 inode->i_ino = hash;
447
448 /* We can't support update_atime(), since the server will reset it */
449 inode->i_flags |= S_NOATIME|S_NOCMTIME;
450 inode->i_mode = fattr->mode;
451 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
452 && nfs_server_capable(inode, NFS_CAP_MODE))
453 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
454 /* Why so? Because we want revalidate for devices/FIFOs, and
455 * that's precisely what we have in nfs_file_inode_operations.
456 */
457 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
458 if (S_ISREG(inode->i_mode)) {
459 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
460 inode->i_data.a_ops = &nfs_file_aops;
461 } else if (S_ISDIR(inode->i_mode)) {
462 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
463 inode->i_fop = &nfs_dir_operations;
464 inode->i_data.a_ops = &nfs_dir_aops;
465 /* Deal with crossing mountpoints */
466 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
467 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
468 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
469 inode->i_op = &nfs_referral_inode_operations;
470 else
471 inode->i_op = &nfs_mountpoint_inode_operations;
472 inode->i_fop = NULL;
473 inode->i_flags |= S_AUTOMOUNT;
474 }
475 } else if (S_ISLNK(inode->i_mode)) {
476 inode->i_op = &nfs_symlink_inode_operations;
477 inode_nohighmem(inode);
478 } else
479 init_special_inode(inode, inode->i_mode, fattr->rdev);
480
481 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
482 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
483 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
484 inode_set_iversion_raw(inode, 0);
485 inode->i_size = 0;
486 clear_nlink(inode);
487 inode->i_uid = make_kuid(&init_user_ns, -2);
488 inode->i_gid = make_kgid(&init_user_ns, -2);
489 inode->i_blocks = 0;
490 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
491 nfsi->write_io = 0;
492 nfsi->read_io = 0;
493
494 nfsi->read_cache_jiffies = fattr->time_start;
495 nfsi->attr_gencount = fattr->gencount;
496 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
497 inode->i_atime = timespec_to_timespec64(fattr->atime);
498 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
499 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
500 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
501 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
502 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
503 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
504 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
505 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
506 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
507 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
508 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
509 inode_set_iversion_raw(inode, fattr->change_attr);
510 else
511 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
512 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
513 inode->i_size = nfs_size_to_loff_t(fattr->size);
514 else
515 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
516 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
517 set_nlink(inode, fattr->nlink);
518 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
519 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
520 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
521 inode->i_uid = fattr->uid;
522 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
524 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
525 inode->i_gid = fattr->gid;
526 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
528 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
529 inode->i_blocks = fattr->du.nfs2.blocks;
530 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
531 /*
532 * report the blocks in 512byte units
533 */
534 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
535 }
536
537 nfs_setsecurity(inode, fattr, label);
538
539 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
540 nfsi->attrtimeo_timestamp = now;
541 nfsi->access_cache = RB_ROOT;
542
543 nfs_fscache_init_inode(inode);
544
545 unlock_new_inode(inode);
546 } else {
547 int err = nfs_refresh_inode(inode, fattr);
548 if (err < 0) {
549 iput(inode);
550 inode = ERR_PTR(err);
551 goto out_no_inode;
552 }
553 }
554 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
555 inode->i_sb->s_id,
556 (unsigned long long)NFS_FILEID(inode),
557 nfs_display_fhandle_hash(fh),
558 atomic_read(&inode->i_count));
559
560 out:
561 return inode;
562
563 out_no_inode:
564 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
565 goto out;
566 }
567 EXPORT_SYMBOL_GPL(nfs_fhget);
568
569 #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)
570
571 int
572 nfs_setattr(struct dentry *dentry, struct iattr *attr)
573 {
574 struct inode *inode = d_inode(dentry);
575 struct nfs_fattr *fattr;
576 int error = 0;
577
578 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
579
580 /* skip mode change if it's just for clearing setuid/setgid */
581 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
582 attr->ia_valid &= ~ATTR_MODE;
583
584 if (attr->ia_valid & ATTR_SIZE) {
585 BUG_ON(!S_ISREG(inode->i_mode));
586
587 error = inode_newsize_ok(inode, attr->ia_size);
588 if (error)
589 return error;
590
591 if (attr->ia_size == i_size_read(inode))
592 attr->ia_valid &= ~ATTR_SIZE;
593 }
594
595 /* Optimization: if the end result is no change, don't RPC */
596 attr->ia_valid &= NFS_VALID_ATTRS;
597 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
598 return 0;
599
600 trace_nfs_setattr_enter(inode);
601
602 /* Write all dirty data */
603 if (S_ISREG(inode->i_mode))
604 nfs_sync_inode(inode);
605
606 fattr = nfs_alloc_fattr();
607 if (fattr == NULL) {
608 error = -ENOMEM;
609 goto out;
610 }
611
612 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
613 if (error == 0)
614 error = nfs_refresh_inode(inode, fattr);
615 nfs_free_fattr(fattr);
616 out:
617 trace_nfs_setattr_exit(inode, error);
618 return error;
619 }
620 EXPORT_SYMBOL_GPL(nfs_setattr);
621
622 /**
623 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
624 * @inode: inode of the file used
625 * @offset: file offset to start truncating
626 *
627 * This is a copy of the common vmtruncate, but with the locking
628 * corrected to take into account the fact that NFS requires
629 * inode->i_size to be updated under the inode->i_lock.
630 * Note: must be called with inode->i_lock held!
631 */
632 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
633 {
634 int err;
635
636 err = inode_newsize_ok(inode, offset);
637 if (err)
638 goto out;
639
640 i_size_write(inode, offset);
641 /* Optimisation */
642 if (offset == 0)
643 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
644 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
645
646 spin_unlock(&inode->i_lock);
647 truncate_pagecache(inode, offset);
648 spin_lock(&inode->i_lock);
649 out:
650 return err;
651 }
652
653 /**
654 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
655 * @inode: pointer to struct inode
656 * @attr: pointer to struct iattr
657 * @fattr: pointer to struct nfs_fattr
658 *
659 * Note: we do this in the *proc.c in order to ensure that
660 * it works for things like exclusive creates too.
661 */
662 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
663 struct nfs_fattr *fattr)
664 {
665 /* Barrier: bump the attribute generation count. */
666 nfs_fattr_set_barrier(fattr);
667
668 spin_lock(&inode->i_lock);
669 NFS_I(inode)->attr_gencount = fattr->gencount;
670 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
671 | NFS_INO_INVALID_CTIME);
672 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
673 if ((attr->ia_valid & ATTR_MODE) != 0) {
674 int mode = attr->ia_mode & S_IALLUGO;
675 mode |= inode->i_mode & ~S_IALLUGO;
676 inode->i_mode = mode;
677 }
678 if ((attr->ia_valid & ATTR_UID) != 0)
679 inode->i_uid = attr->ia_uid;
680 if ((attr->ia_valid & ATTR_GID) != 0)
681 inode->i_gid = attr->ia_gid;
682 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
683 | NFS_INO_INVALID_ACL);
684 }
685 if ((attr->ia_valid & ATTR_SIZE) != 0) {
686 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
687 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
688 nfs_vmtruncate(inode, attr->ia_size);
689 }
690 if (fattr->valid)
691 nfs_update_inode(inode, fattr);
692 spin_unlock(&inode->i_lock);
693 }
694 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
695
696 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
697 {
698 struct dentry *parent;
699
700 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
701 return;
702 parent = dget_parent(dentry);
703 nfs_force_use_readdirplus(d_inode(parent));
704 dput(parent);
705 }
706
707 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
708 {
709 struct dentry *parent;
710
711 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
712 return;
713 parent = dget_parent(dentry);
714 nfs_advise_use_readdirplus(d_inode(parent));
715 dput(parent);
716 }
717
718 static bool nfs_need_revalidate_inode(struct inode *inode)
719 {
720 if (NFS_I(inode)->cache_validity &
721 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
722 return true;
723 if (nfs_attribute_cache_expired(inode))
724 return true;
725 return false;
726 }
727
728 int nfs_getattr(const struct path *path, struct kstat *stat,
729 u32 request_mask, unsigned int query_flags)
730 {
731 struct inode *inode = d_inode(path->dentry);
732 struct nfs_server *server = NFS_SERVER(inode);
733 unsigned long cache_validity;
734 int err = 0;
735 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
736 bool do_update = false;
737
738 trace_nfs_getattr_enter(inode);
739
740 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
741 goto out_no_update;
742
743 /* Flush out writes to the server in order to update c/mtime. */
744 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
745 S_ISREG(inode->i_mode)) {
746 err = filemap_write_and_wait(inode->i_mapping);
747 if (err)
748 goto out;
749 }
750
751 /*
752 * We may force a getattr if the user cares about atime.
753 *
754 * Note that we only have to check the vfsmount flags here:
755 * - NFS always sets S_NOATIME by so checking it would give a
756 * bogus result
757 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
758 * no point in checking those.
759 */
760 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
761 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
762 request_mask &= ~STATX_ATIME;
763
764 /* Is the user requesting attributes that might need revalidation? */
765 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
766 STATX_MTIME|STATX_UID|STATX_GID|
767 STATX_SIZE|STATX_BLOCKS)))
768 goto out_no_revalidate;
769
770 /* Check whether the cached attributes are stale */
771 do_update |= force_sync || nfs_attribute_cache_expired(inode);
772 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
773 do_update |= cache_validity &
774 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
775 if (request_mask & STATX_ATIME)
776 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
777 if (request_mask & (STATX_CTIME|STATX_MTIME))
778 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
779 if (do_update) {
780 /* Update the attribute cache */
781 if (!(server->flags & NFS_MOUNT_NOAC))
782 nfs_readdirplus_parent_cache_miss(path->dentry);
783 else
784 nfs_readdirplus_parent_cache_hit(path->dentry);
785 err = __nfs_revalidate_inode(server, inode);
786 if (err)
787 goto out;
788 } else
789 nfs_readdirplus_parent_cache_hit(path->dentry);
790 out_no_revalidate:
791 /* Only return attributes that were revalidated. */
792 stat->result_mask &= request_mask;
793 out_no_update:
794 generic_fillattr(inode, stat);
795 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
796 if (S_ISDIR(inode->i_mode))
797 stat->blksize = NFS_SERVER(inode)->dtsize;
798 out:
799 trace_nfs_getattr_exit(inode, err);
800 return err;
801 }
802 EXPORT_SYMBOL_GPL(nfs_getattr);
803
804 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
805 {
806 refcount_set(&l_ctx->count, 1);
807 l_ctx->lockowner = current->files;
808 INIT_LIST_HEAD(&l_ctx->list);
809 atomic_set(&l_ctx->io_count, 0);
810 }
811
812 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
813 {
814 struct nfs_lock_context *head = &ctx->lock_context;
815 struct nfs_lock_context *pos = head;
816
817 do {
818 if (pos->lockowner != current->files)
819 continue;
820 refcount_inc(&pos->count);
821 return pos;
822 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
823 return NULL;
824 }
825
826 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
827 {
828 struct nfs_lock_context *res, *new = NULL;
829 struct inode *inode = d_inode(ctx->dentry);
830
831 spin_lock(&inode->i_lock);
832 res = __nfs_find_lock_context(ctx);
833 if (res == NULL) {
834 spin_unlock(&inode->i_lock);
835 new = kmalloc(sizeof(*new), GFP_KERNEL);
836 if (new == NULL)
837 return ERR_PTR(-ENOMEM);
838 nfs_init_lock_context(new);
839 spin_lock(&inode->i_lock);
840 res = __nfs_find_lock_context(ctx);
841 if (res == NULL) {
842 list_add_tail(&new->list, &ctx->lock_context.list);
843 new->open_context = ctx;
844 res = new;
845 new = NULL;
846 }
847 }
848 spin_unlock(&inode->i_lock);
849 kfree(new);
850 return res;
851 }
852 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
853
854 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
855 {
856 struct nfs_open_context *ctx = l_ctx->open_context;
857 struct inode *inode = d_inode(ctx->dentry);
858
859 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
860 return;
861 list_del(&l_ctx->list);
862 spin_unlock(&inode->i_lock);
863 kfree(l_ctx);
864 }
865 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
866
867 /**
868 * nfs_close_context - Common close_context() routine NFSv2/v3
869 * @ctx: pointer to context
870 * @is_sync: is this a synchronous close
871 *
872 * Ensure that the attributes are up to date if we're mounted
873 * with close-to-open semantics and we have cached data that will
874 * need to be revalidated on open.
875 */
876 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
877 {
878 struct nfs_inode *nfsi;
879 struct inode *inode;
880 struct nfs_server *server;
881
882 if (!(ctx->mode & FMODE_WRITE))
883 return;
884 if (!is_sync)
885 return;
886 inode = d_inode(ctx->dentry);
887 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
888 return;
889 nfsi = NFS_I(inode);
890 if (inode->i_mapping->nrpages == 0)
891 return;
892 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
893 return;
894 if (!list_empty(&nfsi->open_files))
895 return;
896 server = NFS_SERVER(inode);
897 if (server->flags & NFS_MOUNT_NOCTO)
898 return;
899 nfs_revalidate_inode(server, inode);
900 }
901 EXPORT_SYMBOL_GPL(nfs_close_context);
902
903 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
904 fmode_t f_mode,
905 struct file *filp)
906 {
907 struct nfs_open_context *ctx;
908 struct rpc_cred *cred = rpc_lookup_cred();
909 if (IS_ERR(cred))
910 return ERR_CAST(cred);
911
912 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
913 if (!ctx) {
914 put_rpccred(cred);
915 return ERR_PTR(-ENOMEM);
916 }
917 nfs_sb_active(dentry->d_sb);
918 ctx->dentry = dget(dentry);
919 ctx->cred = cred;
920 ctx->state = NULL;
921 ctx->mode = f_mode;
922 ctx->flags = 0;
923 ctx->error = 0;
924 ctx->flock_owner = (fl_owner_t)filp;
925 nfs_init_lock_context(&ctx->lock_context);
926 ctx->lock_context.open_context = ctx;
927 INIT_LIST_HEAD(&ctx->list);
928 ctx->mdsthreshold = NULL;
929 return ctx;
930 }
931 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
932
933 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
934 {
935 if (ctx != NULL)
936 refcount_inc(&ctx->lock_context.count);
937 return ctx;
938 }
939 EXPORT_SYMBOL_GPL(get_nfs_open_context);
940
941 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
942 {
943 struct inode *inode = d_inode(ctx->dentry);
944 struct super_block *sb = ctx->dentry->d_sb;
945
946 if (!list_empty(&ctx->list)) {
947 if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
948 return;
949 list_del(&ctx->list);
950 spin_unlock(&inode->i_lock);
951 } else if (!refcount_dec_and_test(&ctx->lock_context.count))
952 return;
953 if (inode != NULL)
954 NFS_PROTO(inode)->close_context(ctx, is_sync);
955 if (ctx->cred != NULL)
956 put_rpccred(ctx->cred);
957 dput(ctx->dentry);
958 nfs_sb_deactive(sb);
959 kfree(ctx->mdsthreshold);
960 kfree(ctx);
961 }
962
963 void put_nfs_open_context(struct nfs_open_context *ctx)
964 {
965 __put_nfs_open_context(ctx, 0);
966 }
967 EXPORT_SYMBOL_GPL(put_nfs_open_context);
968
969 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
970 {
971 __put_nfs_open_context(ctx, 1);
972 }
973
974 /*
975 * Ensure that mmap has a recent RPC credential for use when writing out
976 * shared pages
977 */
978 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
979 {
980 struct inode *inode = d_inode(ctx->dentry);
981 struct nfs_inode *nfsi = NFS_I(inode);
982
983 spin_lock(&inode->i_lock);
984 if (ctx->mode & FMODE_WRITE)
985 list_add(&ctx->list, &nfsi->open_files);
986 else
987 list_add_tail(&ctx->list, &nfsi->open_files);
988 spin_unlock(&inode->i_lock);
989 }
990 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
991
992 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
993 {
994 filp->private_data = get_nfs_open_context(ctx);
995 if (list_empty(&ctx->list))
996 nfs_inode_attach_open_context(ctx);
997 }
998 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
999
1000 /*
1001 * Given an inode, search for an open context with the desired characteristics
1002 */
1003 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1004 {
1005 struct nfs_inode *nfsi = NFS_I(inode);
1006 struct nfs_open_context *pos, *ctx = NULL;
1007
1008 spin_lock(&inode->i_lock);
1009 list_for_each_entry(pos, &nfsi->open_files, list) {
1010 if (cred != NULL && pos->cred != cred)
1011 continue;
1012 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1013 continue;
1014 ctx = get_nfs_open_context(pos);
1015 break;
1016 }
1017 spin_unlock(&inode->i_lock);
1018 return ctx;
1019 }
1020
1021 void nfs_file_clear_open_context(struct file *filp)
1022 {
1023 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1024
1025 if (ctx) {
1026 struct inode *inode = d_inode(ctx->dentry);
1027
1028 /*
1029 * We fatal error on write before. Try to writeback
1030 * every page again.
1031 */
1032 if (ctx->error < 0)
1033 invalidate_inode_pages2(inode->i_mapping);
1034 filp->private_data = NULL;
1035 spin_lock(&inode->i_lock);
1036 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1037 spin_unlock(&inode->i_lock);
1038 put_nfs_open_context_sync(ctx);
1039 }
1040 }
1041
1042 /*
1043 * These allocate and release file read/write context information.
1044 */
1045 int nfs_open(struct inode *inode, struct file *filp)
1046 {
1047 struct nfs_open_context *ctx;
1048
1049 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1050 if (IS_ERR(ctx))
1051 return PTR_ERR(ctx);
1052 nfs_file_set_open_context(filp, ctx);
1053 put_nfs_open_context(ctx);
1054 nfs_fscache_open_file(inode, filp);
1055 return 0;
1056 }
1057
1058 /*
1059 * This function is called whenever some part of NFS notices that
1060 * the cached attributes have to be refreshed.
1061 */
1062 int
1063 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1064 {
1065 int status = -ESTALE;
1066 struct nfs4_label *label = NULL;
1067 struct nfs_fattr *fattr = NULL;
1068 struct nfs_inode *nfsi = NFS_I(inode);
1069
1070 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1071 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1072
1073 trace_nfs_revalidate_inode_enter(inode);
1074
1075 if (is_bad_inode(inode))
1076 goto out;
1077 if (NFS_STALE(inode))
1078 goto out;
1079
1080 /* pNFS: Attributes aren't updated until we layoutcommit */
1081 if (S_ISREG(inode->i_mode)) {
1082 status = pnfs_sync_inode(inode, false);
1083 if (status)
1084 goto out;
1085 }
1086
1087 status = -ENOMEM;
1088 fattr = nfs_alloc_fattr();
1089 if (fattr == NULL)
1090 goto out;
1091
1092 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1093
1094 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1095 if (IS_ERR(label)) {
1096 status = PTR_ERR(label);
1097 goto out;
1098 }
1099
1100 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1101 if (status != 0) {
1102 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1103 inode->i_sb->s_id,
1104 (unsigned long long)NFS_FILEID(inode), status);
1105 if (status == -ESTALE) {
1106 nfs_zap_caches(inode);
1107 if (!S_ISDIR(inode->i_mode))
1108 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1109 }
1110 goto err_out;
1111 }
1112
1113 status = nfs_refresh_inode(inode, fattr);
1114 if (status) {
1115 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1116 inode->i_sb->s_id,
1117 (unsigned long long)NFS_FILEID(inode), status);
1118 goto err_out;
1119 }
1120
1121 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1122 nfs_zap_acl_cache(inode);
1123
1124 nfs_setsecurity(inode, fattr, label);
1125
1126 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1127 inode->i_sb->s_id,
1128 (unsigned long long)NFS_FILEID(inode));
1129
1130 err_out:
1131 nfs4_label_free(label);
1132 out:
1133 nfs_free_fattr(fattr);
1134 trace_nfs_revalidate_inode_exit(inode, status);
1135 return status;
1136 }
1137
1138 int nfs_attribute_cache_expired(struct inode *inode)
1139 {
1140 if (nfs_have_delegated_attributes(inode))
1141 return 0;
1142 return nfs_attribute_timeout(inode);
1143 }
1144
1145 /**
1146 * nfs_revalidate_inode - Revalidate the inode attributes
1147 * @server - pointer to nfs_server struct
1148 * @inode - pointer to inode struct
1149 *
1150 * Updates inode attribute information by retrieving the data from the server.
1151 */
1152 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1153 {
1154 if (!nfs_need_revalidate_inode(inode))
1155 return NFS_STALE(inode) ? -ESTALE : 0;
1156 return __nfs_revalidate_inode(server, inode);
1157 }
1158 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1159
1160 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1161 {
1162 struct nfs_inode *nfsi = NFS_I(inode);
1163 int ret;
1164
1165 if (mapping->nrpages != 0) {
1166 if (S_ISREG(inode->i_mode)) {
1167 ret = nfs_sync_mapping(mapping);
1168 if (ret < 0)
1169 return ret;
1170 }
1171 ret = invalidate_inode_pages2(mapping);
1172 if (ret < 0)
1173 return ret;
1174 }
1175 if (S_ISDIR(inode->i_mode)) {
1176 spin_lock(&inode->i_lock);
1177 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1178 spin_unlock(&inode->i_lock);
1179 }
1180 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1181 nfs_fscache_wait_on_invalidate(inode);
1182
1183 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1184 inode->i_sb->s_id,
1185 (unsigned long long)NFS_FILEID(inode));
1186 return 0;
1187 }
1188
1189 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1190 {
1191 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1192 NFS_STALE(inode);
1193 }
1194
1195 int nfs_revalidate_mapping_rcu(struct inode *inode)
1196 {
1197 struct nfs_inode *nfsi = NFS_I(inode);
1198 unsigned long *bitlock = &nfsi->flags;
1199 int ret = 0;
1200
1201 if (IS_SWAPFILE(inode))
1202 goto out;
1203 if (nfs_mapping_need_revalidate_inode(inode)) {
1204 ret = -ECHILD;
1205 goto out;
1206 }
1207 spin_lock(&inode->i_lock);
1208 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1209 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1210 ret = -ECHILD;
1211 spin_unlock(&inode->i_lock);
1212 out:
1213 return ret;
1214 }
1215
1216 /**
1217 * nfs_revalidate_mapping - Revalidate the pagecache
1218 * @inode - pointer to host inode
1219 * @mapping - pointer to mapping
1220 */
1221 int nfs_revalidate_mapping(struct inode *inode,
1222 struct address_space *mapping)
1223 {
1224 struct nfs_inode *nfsi = NFS_I(inode);
1225 unsigned long *bitlock = &nfsi->flags;
1226 int ret = 0;
1227
1228 /* swapfiles are not supposed to be shared. */
1229 if (IS_SWAPFILE(inode))
1230 goto out;
1231
1232 if (nfs_mapping_need_revalidate_inode(inode)) {
1233 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1234 if (ret < 0)
1235 goto out;
1236 }
1237
1238 /*
1239 * We must clear NFS_INO_INVALID_DATA first to ensure that
1240 * invalidations that come in while we're shooting down the mappings
1241 * are respected. But, that leaves a race window where one revalidator
1242 * can clear the flag, and then another checks it before the mapping
1243 * gets invalidated. Fix that by serializing access to this part of
1244 * the function.
1245 *
1246 * At the same time, we need to allow other tasks to see whether we
1247 * might be in the middle of invalidating the pages, so we only set
1248 * the bit lock here if it looks like we're going to be doing that.
1249 */
1250 for (;;) {
1251 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1252 nfs_wait_bit_killable, TASK_KILLABLE);
1253 if (ret)
1254 goto out;
1255 spin_lock(&inode->i_lock);
1256 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1257 spin_unlock(&inode->i_lock);
1258 continue;
1259 }
1260 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1261 break;
1262 spin_unlock(&inode->i_lock);
1263 goto out;
1264 }
1265
1266 set_bit(NFS_INO_INVALIDATING, bitlock);
1267 smp_wmb();
1268 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1269 spin_unlock(&inode->i_lock);
1270 trace_nfs_invalidate_mapping_enter(inode);
1271 ret = nfs_invalidate_mapping(inode, mapping);
1272 trace_nfs_invalidate_mapping_exit(inode, ret);
1273
1274 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1275 smp_mb__after_atomic();
1276 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1277 out:
1278 return ret;
1279 }
1280
1281 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1282 {
1283 struct inode *inode = &nfsi->vfs_inode;
1284
1285 assert_spin_locked(&inode->i_lock);
1286
1287 if (!S_ISREG(inode->i_mode))
1288 return false;
1289 if (list_empty(&nfsi->open_files))
1290 return false;
1291 /* Note: This relies on nfsi->open_files being ordered with writers
1292 * being placed at the head of the list.
1293 * See nfs_inode_attach_open_context()
1294 */
1295 return (list_first_entry(&nfsi->open_files,
1296 struct nfs_open_context,
1297 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1298 }
1299
1300 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1301 {
1302 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1303 }
1304
1305 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1306 {
1307 struct timespec ts;
1308
1309 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1310 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1311 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1312 inode_set_iversion_raw(inode, fattr->change_attr);
1313 if (S_ISDIR(inode->i_mode))
1314 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1315 }
1316 /* If we have atomic WCC data, we may update some attributes */
1317 ts = timespec64_to_timespec(inode->i_ctime);
1318 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1319 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1320 && timespec_equal(&ts, &fattr->pre_ctime)) {
1321 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1322 }
1323
1324 ts = timespec64_to_timespec(inode->i_mtime);
1325 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1326 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1327 && timespec_equal(&ts, &fattr->pre_mtime)) {
1328 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1329 if (S_ISDIR(inode->i_mode))
1330 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1331 }
1332 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1333 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1334 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1335 && !nfs_have_writebacks(inode)) {
1336 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1337 }
1338 }
1339
1340 /**
1341 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1342 * @inode - pointer to inode
1343 * @fattr - updated attributes
1344 *
1345 * Verifies the attribute cache. If we have just changed the attributes,
1346 * so that fattr carries weak cache consistency data, then it may
1347 * also update the ctime/mtime/change_attribute.
1348 */
1349 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1350 {
1351 struct nfs_inode *nfsi = NFS_I(inode);
1352 loff_t cur_size, new_isize;
1353 unsigned long invalid = 0;
1354 struct timespec ts;
1355
1356 if (nfs_have_delegated_attributes(inode))
1357 return 0;
1358 /* Has the inode gone and changed behind our back? */
1359 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1360 return -ESTALE;
1361 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1362 return -ESTALE;
1363
1364 if (!nfs_file_has_buffered_writers(nfsi)) {
1365 /* Verify a few of the more important attributes */
1366 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1367 invalid |= NFS_INO_INVALID_CHANGE
1368 | NFS_INO_REVAL_PAGECACHE;
1369
1370 ts = timespec64_to_timespec(inode->i_mtime);
1371 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime))
1372 invalid |= NFS_INO_INVALID_MTIME;
1373
1374 ts = timespec64_to_timespec(inode->i_ctime);
1375 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime))
1376 invalid |= NFS_INO_INVALID_CTIME;
1377
1378 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1379 cur_size = i_size_read(inode);
1380 new_isize = nfs_size_to_loff_t(fattr->size);
1381 if (cur_size != new_isize)
1382 invalid |= NFS_INO_INVALID_SIZE
1383 | NFS_INO_REVAL_PAGECACHE;
1384 }
1385 }
1386
1387 /* Have any file permissions changed? */
1388 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1389 invalid |= NFS_INO_INVALID_ACCESS
1390 | NFS_INO_INVALID_ACL
1391 | NFS_INO_INVALID_OTHER;
1392 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1393 invalid |= NFS_INO_INVALID_ACCESS
1394 | NFS_INO_INVALID_ACL
1395 | NFS_INO_INVALID_OTHER;
1396 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1397 invalid |= NFS_INO_INVALID_ACCESS
1398 | NFS_INO_INVALID_ACL
1399 | NFS_INO_INVALID_OTHER;
1400
1401 /* Has the link count changed? */
1402 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1403 invalid |= NFS_INO_INVALID_OTHER;
1404
1405 ts = timespec64_to_timespec(inode->i_atime);
1406 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime))
1407 invalid |= NFS_INO_INVALID_ATIME;
1408
1409 if (invalid != 0)
1410 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1411
1412 nfsi->read_cache_jiffies = fattr->time_start;
1413 return 0;
1414 }
1415
1416 static atomic_long_t nfs_attr_generation_counter;
1417
1418 static unsigned long nfs_read_attr_generation_counter(void)
1419 {
1420 return atomic_long_read(&nfs_attr_generation_counter);
1421 }
1422
1423 unsigned long nfs_inc_attr_generation_counter(void)
1424 {
1425 return atomic_long_inc_return(&nfs_attr_generation_counter);
1426 }
1427 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1428
1429 void nfs_fattr_init(struct nfs_fattr *fattr)
1430 {
1431 fattr->valid = 0;
1432 fattr->time_start = jiffies;
1433 fattr->gencount = nfs_inc_attr_generation_counter();
1434 fattr->owner_name = NULL;
1435 fattr->group_name = NULL;
1436 }
1437 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1438
1439 /**
1440 * nfs_fattr_set_barrier
1441 * @fattr: attributes
1442 *
1443 * Used to set a barrier after an attribute was updated. This
1444 * barrier ensures that older attributes from RPC calls that may
1445 * have raced with our update cannot clobber these new values.
1446 * Note that you are still responsible for ensuring that other
1447 * operations which change the attribute on the server do not
1448 * collide.
1449 */
1450 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1451 {
1452 fattr->gencount = nfs_inc_attr_generation_counter();
1453 }
1454
1455 struct nfs_fattr *nfs_alloc_fattr(void)
1456 {
1457 struct nfs_fattr *fattr;
1458
1459 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1460 if (fattr != NULL)
1461 nfs_fattr_init(fattr);
1462 return fattr;
1463 }
1464 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1465
1466 struct nfs_fh *nfs_alloc_fhandle(void)
1467 {
1468 struct nfs_fh *fh;
1469
1470 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1471 if (fh != NULL)
1472 fh->size = 0;
1473 return fh;
1474 }
1475 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1476
1477 #ifdef NFS_DEBUG
1478 /*
1479 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1480 * in the same way that wireshark does
1481 *
1482 * @fh: file handle
1483 *
1484 * For debugging only.
1485 */
1486 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1487 {
1488 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1489 * not on the result */
1490 return nfs_fhandle_hash(fh);
1491 }
1492 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1493
1494 /*
1495 * _nfs_display_fhandle - display an NFS file handle on the console
1496 *
1497 * @fh: file handle to display
1498 * @caption: display caption
1499 *
1500 * For debugging only.
1501 */
1502 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1503 {
1504 unsigned short i;
1505
1506 if (fh == NULL || fh->size == 0) {
1507 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1508 return;
1509 }
1510
1511 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1512 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1513 for (i = 0; i < fh->size; i += 16) {
1514 __be32 *pos = (__be32 *)&fh->data[i];
1515
1516 switch ((fh->size - i - 1) >> 2) {
1517 case 0:
1518 printk(KERN_DEFAULT " %08x\n",
1519 be32_to_cpup(pos));
1520 break;
1521 case 1:
1522 printk(KERN_DEFAULT " %08x %08x\n",
1523 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1524 break;
1525 case 2:
1526 printk(KERN_DEFAULT " %08x %08x %08x\n",
1527 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1528 be32_to_cpup(pos + 2));
1529 break;
1530 default:
1531 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1532 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1533 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1534 }
1535 }
1536 }
1537 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1538 #endif
1539
1540 /**
1541 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1542 * @inode - pointer to inode
1543 * @fattr - attributes
1544 *
1545 * Attempt to divine whether or not an RPC call reply carrying stale
1546 * attributes got scheduled after another call carrying updated ones.
1547 *
1548 * To do so, the function first assumes that a more recent ctime means
1549 * that the attributes in fattr are newer, however it also attempt to
1550 * catch the case where ctime either didn't change, or went backwards
1551 * (if someone reset the clock on the server) by looking at whether
1552 * or not this RPC call was started after the inode was last updated.
1553 * Note also the check for wraparound of 'attr_gencount'
1554 *
1555 * The function returns 'true' if it thinks the attributes in 'fattr' are
1556 * more recent than the ones cached in the inode.
1557 *
1558 */
1559 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1560 {
1561 const struct nfs_inode *nfsi = NFS_I(inode);
1562
1563 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1564 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1565 }
1566
1567 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1568 {
1569 int ret;
1570
1571 trace_nfs_refresh_inode_enter(inode);
1572
1573 if (nfs_inode_attrs_need_update(inode, fattr))
1574 ret = nfs_update_inode(inode, fattr);
1575 else
1576 ret = nfs_check_inode_attributes(inode, fattr);
1577
1578 trace_nfs_refresh_inode_exit(inode, ret);
1579 return ret;
1580 }
1581
1582 /**
1583 * nfs_refresh_inode - try to update the inode attribute cache
1584 * @inode - pointer to inode
1585 * @fattr - updated attributes
1586 *
1587 * Check that an RPC call that returned attributes has not overlapped with
1588 * other recent updates of the inode metadata, then decide whether it is
1589 * safe to do a full update of the inode attributes, or whether just to
1590 * call nfs_check_inode_attributes.
1591 */
1592 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1593 {
1594 int status;
1595
1596 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1597 return 0;
1598 spin_lock(&inode->i_lock);
1599 status = nfs_refresh_inode_locked(inode, fattr);
1600 spin_unlock(&inode->i_lock);
1601
1602 return status;
1603 }
1604 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1605
1606 static int nfs_post_op_update_inode_locked(struct inode *inode,
1607 struct nfs_fattr *fattr, unsigned int invalid)
1608 {
1609 if (S_ISDIR(inode->i_mode))
1610 invalid |= NFS_INO_INVALID_DATA;
1611 nfs_set_cache_invalid(inode, invalid);
1612 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1613 return 0;
1614 return nfs_refresh_inode_locked(inode, fattr);
1615 }
1616
1617 /**
1618 * nfs_post_op_update_inode - try to update the inode attribute cache
1619 * @inode - pointer to inode
1620 * @fattr - updated attributes
1621 *
1622 * After an operation that has changed the inode metadata, mark the
1623 * attribute cache as being invalid, then try to update it.
1624 *
1625 * NB: if the server didn't return any post op attributes, this
1626 * function will force the retrieval of attributes before the next
1627 * NFS request. Thus it should be used only for operations that
1628 * are expected to change one or more attributes, to avoid
1629 * unnecessary NFS requests and trips through nfs_update_inode().
1630 */
1631 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1632 {
1633 int status;
1634
1635 spin_lock(&inode->i_lock);
1636 nfs_fattr_set_barrier(fattr);
1637 status = nfs_post_op_update_inode_locked(inode, fattr,
1638 NFS_INO_INVALID_CHANGE
1639 | NFS_INO_INVALID_CTIME);
1640 spin_unlock(&inode->i_lock);
1641
1642 return status;
1643 }
1644 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1645
1646 /**
1647 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1648 * @inode - pointer to inode
1649 * @fattr - updated attributes
1650 *
1651 * After an operation that has changed the inode metadata, mark the
1652 * attribute cache as being invalid, then try to update it. Fake up
1653 * weak cache consistency data, if none exist.
1654 *
1655 * This function is mainly designed to be used by the ->write_done() functions.
1656 */
1657 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1658 {
1659 int status;
1660
1661 /* Don't do a WCC update if these attributes are already stale */
1662 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1663 !nfs_inode_attrs_need_update(inode, fattr)) {
1664 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1665 | NFS_ATTR_FATTR_PRESIZE
1666 | NFS_ATTR_FATTR_PREMTIME
1667 | NFS_ATTR_FATTR_PRECTIME);
1668 goto out_noforce;
1669 }
1670 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1671 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1672 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1673 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1674 }
1675 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1676 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1677 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime);
1678 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1679 }
1680 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1681 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1682 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime);
1683 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1684 }
1685 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1686 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1687 fattr->pre_size = i_size_read(inode);
1688 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1689 }
1690 out_noforce:
1691 status = nfs_post_op_update_inode_locked(inode, fattr,
1692 NFS_INO_INVALID_CHANGE
1693 | NFS_INO_INVALID_CTIME
1694 | NFS_INO_INVALID_MTIME);
1695 return status;
1696 }
1697
1698 /**
1699 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1700 * @inode - pointer to inode
1701 * @fattr - updated attributes
1702 *
1703 * After an operation that has changed the inode metadata, mark the
1704 * attribute cache as being invalid, then try to update it. Fake up
1705 * weak cache consistency data, if none exist.
1706 *
1707 * This function is mainly designed to be used by the ->write_done() functions.
1708 */
1709 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1710 {
1711 int status;
1712
1713 spin_lock(&inode->i_lock);
1714 nfs_fattr_set_barrier(fattr);
1715 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1716 spin_unlock(&inode->i_lock);
1717 return status;
1718 }
1719 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1720
1721
1722 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1723 struct nfs_fattr *fattr)
1724 {
1725 bool ret1 = true, ret2 = true;
1726
1727 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1728 ret1 = (nfsi->fileid == fattr->fileid);
1729 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1730 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1731 return ret1 || ret2;
1732 }
1733
1734 /*
1735 * Many nfs protocol calls return the new file attributes after
1736 * an operation. Here we update the inode to reflect the state
1737 * of the server's inode.
1738 *
1739 * This is a bit tricky because we have to make sure all dirty pages
1740 * have been sent off to the server before calling invalidate_inode_pages.
1741 * To make sure no other process adds more write requests while we try
1742 * our best to flush them, we make them sleep during the attribute refresh.
1743 *
1744 * A very similar scenario holds for the dir cache.
1745 */
1746 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1747 {
1748 struct nfs_server *server;
1749 struct nfs_inode *nfsi = NFS_I(inode);
1750 loff_t cur_isize, new_isize;
1751 unsigned long invalid = 0;
1752 unsigned long now = jiffies;
1753 unsigned long save_cache_validity;
1754 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1755 bool cache_revalidated = true;
1756
1757 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1758 __func__, inode->i_sb->s_id, inode->i_ino,
1759 nfs_display_fhandle_hash(NFS_FH(inode)),
1760 atomic_read(&inode->i_count), fattr->valid);
1761
1762 if (!nfs_fileid_valid(nfsi, fattr)) {
1763 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1764 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1765 NFS_SERVER(inode)->nfs_client->cl_hostname,
1766 inode->i_sb->s_id, (long long)nfsi->fileid,
1767 (long long)fattr->fileid);
1768 goto out_err;
1769 }
1770
1771 /*
1772 * Make sure the inode's type hasn't changed.
1773 */
1774 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1775 /*
1776 * Big trouble! The inode has become a different object.
1777 */
1778 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1779 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1780 goto out_err;
1781 }
1782
1783 server = NFS_SERVER(inode);
1784 /* Update the fsid? */
1785 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1786 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1787 !IS_AUTOMOUNT(inode))
1788 server->fsid = fattr->fsid;
1789
1790 /*
1791 * Update the read time so we don't revalidate too often.
1792 */
1793 nfsi->read_cache_jiffies = fattr->time_start;
1794
1795 save_cache_validity = nfsi->cache_validity;
1796 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1797 | NFS_INO_INVALID_ATIME
1798 | NFS_INO_REVAL_FORCED
1799 | NFS_INO_REVAL_PAGECACHE);
1800
1801 /* Do atomic weak cache consistency updates */
1802 nfs_wcc_update_inode(inode, fattr);
1803
1804 if (pnfs_layoutcommit_outstanding(inode)) {
1805 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1806 cache_revalidated = false;
1807 }
1808
1809 /* More cache consistency checks */
1810 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1811 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1812 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1813 inode->i_sb->s_id, inode->i_ino);
1814 /* Could it be a race with writeback? */
1815 if (!have_writers) {
1816 invalid |= NFS_INO_INVALID_CHANGE
1817 | NFS_INO_INVALID_DATA
1818 | NFS_INO_INVALID_ACCESS
1819 | NFS_INO_INVALID_ACL;
1820 /* Force revalidate of all attributes */
1821 save_cache_validity |= NFS_INO_INVALID_CTIME
1822 | NFS_INO_INVALID_MTIME
1823 | NFS_INO_INVALID_SIZE
1824 | NFS_INO_INVALID_OTHER;
1825 if (S_ISDIR(inode->i_mode))
1826 nfs_force_lookup_revalidate(inode);
1827 }
1828 inode_set_iversion_raw(inode, fattr->change_attr);
1829 }
1830 } else {
1831 nfsi->cache_validity |= save_cache_validity &
1832 (NFS_INO_INVALID_CHANGE
1833 | NFS_INO_REVAL_PAGECACHE
1834 | NFS_INO_REVAL_FORCED);
1835 cache_revalidated = false;
1836 }
1837
1838 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1839 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1840 } else if (server->caps & NFS_CAP_MTIME) {
1841 nfsi->cache_validity |= save_cache_validity &
1842 (NFS_INO_INVALID_MTIME
1843 | NFS_INO_REVAL_FORCED);
1844 cache_revalidated = false;
1845 }
1846
1847 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1848 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1849 } else if (server->caps & NFS_CAP_CTIME) {
1850 nfsi->cache_validity |= save_cache_validity &
1851 (NFS_INO_INVALID_CTIME
1852 | NFS_INO_REVAL_FORCED);
1853 cache_revalidated = false;
1854 }
1855
1856 /* Check if our cached file size is stale */
1857 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1858 new_isize = nfs_size_to_loff_t(fattr->size);
1859 cur_isize = i_size_read(inode);
1860 if (new_isize != cur_isize) {
1861 /* Do we perhaps have any outstanding writes, or has
1862 * the file grown beyond our last write? */
1863 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1864 i_size_write(inode, new_isize);
1865 if (!have_writers)
1866 invalid |= NFS_INO_INVALID_DATA;
1867 }
1868 dprintk("NFS: isize change on server for file %s/%ld "
1869 "(%Ld to %Ld)\n",
1870 inode->i_sb->s_id,
1871 inode->i_ino,
1872 (long long)cur_isize,
1873 (long long)new_isize);
1874 }
1875 } else {
1876 nfsi->cache_validity |= save_cache_validity &
1877 (NFS_INO_INVALID_SIZE
1878 | NFS_INO_REVAL_PAGECACHE
1879 | NFS_INO_REVAL_FORCED);
1880 cache_revalidated = false;
1881 }
1882
1883
1884 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1885 inode->i_atime = timespec_to_timespec64(fattr->atime);
1886 else if (server->caps & NFS_CAP_ATIME) {
1887 nfsi->cache_validity |= save_cache_validity &
1888 (NFS_INO_INVALID_ATIME
1889 | NFS_INO_REVAL_FORCED);
1890 cache_revalidated = false;
1891 }
1892
1893 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1894 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1895 umode_t newmode = inode->i_mode & S_IFMT;
1896 newmode |= fattr->mode & S_IALLUGO;
1897 inode->i_mode = newmode;
1898 invalid |= NFS_INO_INVALID_ACCESS
1899 | NFS_INO_INVALID_ACL
1900 | NFS_INO_INVALID_OTHER;
1901 }
1902 } else if (server->caps & NFS_CAP_MODE) {
1903 nfsi->cache_validity |= save_cache_validity &
1904 (NFS_INO_INVALID_ACCESS
1905 | NFS_INO_INVALID_ACL
1906 | NFS_INO_INVALID_OTHER
1907 | NFS_INO_REVAL_FORCED);
1908 cache_revalidated = false;
1909 }
1910
1911 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1912 if (!uid_eq(inode->i_uid, fattr->uid)) {
1913 invalid |= NFS_INO_INVALID_ACCESS
1914 | NFS_INO_INVALID_ACL
1915 | NFS_INO_INVALID_OTHER;
1916 inode->i_uid = fattr->uid;
1917 }
1918 } else if (server->caps & NFS_CAP_OWNER) {
1919 nfsi->cache_validity |= save_cache_validity &
1920 (NFS_INO_INVALID_ACCESS
1921 | NFS_INO_INVALID_ACL
1922 | NFS_INO_INVALID_OTHER
1923 | NFS_INO_REVAL_FORCED);
1924 cache_revalidated = false;
1925 }
1926
1927 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1928 if (!gid_eq(inode->i_gid, fattr->gid)) {
1929 invalid |= NFS_INO_INVALID_ACCESS
1930 | NFS_INO_INVALID_ACL
1931 | NFS_INO_INVALID_OTHER;
1932 inode->i_gid = fattr->gid;
1933 }
1934 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1935 nfsi->cache_validity |= save_cache_validity &
1936 (NFS_INO_INVALID_ACCESS
1937 | NFS_INO_INVALID_ACL
1938 | NFS_INO_INVALID_OTHER
1939 | NFS_INO_REVAL_FORCED);
1940 cache_revalidated = false;
1941 }
1942
1943 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1944 if (inode->i_nlink != fattr->nlink) {
1945 invalid |= NFS_INO_INVALID_OTHER;
1946 if (S_ISDIR(inode->i_mode))
1947 invalid |= NFS_INO_INVALID_DATA;
1948 set_nlink(inode, fattr->nlink);
1949 }
1950 } else if (server->caps & NFS_CAP_NLINK) {
1951 nfsi->cache_validity |= save_cache_validity &
1952 (NFS_INO_INVALID_OTHER
1953 | NFS_INO_REVAL_FORCED);
1954 cache_revalidated = false;
1955 }
1956
1957 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1958 /*
1959 * report the blocks in 512byte units
1960 */
1961 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1962 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1963 inode->i_blocks = fattr->du.nfs2.blocks;
1964 else
1965 cache_revalidated = false;
1966
1967 /* Update attrtimeo value if we're out of the unstable period */
1968 if (invalid & NFS_INO_INVALID_ATTR) {
1969 invalid &= ~NFS_INO_INVALID_ATTR;
1970 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1971 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1972 nfsi->attrtimeo_timestamp = now;
1973 /* Set barrier to be more recent than all outstanding updates */
1974 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1975 } else {
1976 if (cache_revalidated) {
1977 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1978 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1979 nfsi->attrtimeo <<= 1;
1980 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1981 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1982 }
1983 nfsi->attrtimeo_timestamp = now;
1984 }
1985 /* Set the barrier to be more recent than this fattr */
1986 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1987 nfsi->attr_gencount = fattr->gencount;
1988 }
1989
1990 /* Don't invalidate the data if we were to blame */
1991 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1992 || S_ISLNK(inode->i_mode)))
1993 invalid &= ~NFS_INO_INVALID_DATA;
1994 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1995 (save_cache_validity & NFS_INO_REVAL_FORCED))
1996 nfs_set_cache_invalid(inode, invalid);
1997
1998 return 0;
1999 out_err:
2000 /*
2001 * No need to worry about unhashing the dentry, as the
2002 * lookup validation will know that the inode is bad.
2003 * (But we fall through to invalidate the caches.)
2004 */
2005 nfs_invalidate_inode(inode);
2006 return -ESTALE;
2007 }
2008
2009 struct inode *nfs_alloc_inode(struct super_block *sb)
2010 {
2011 struct nfs_inode *nfsi;
2012 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2013 if (!nfsi)
2014 return NULL;
2015 nfsi->flags = 0UL;
2016 nfsi->cache_validity = 0UL;
2017 #if IS_ENABLED(CONFIG_NFS_V4)
2018 nfsi->nfs4_acl = NULL;
2019 #endif /* CONFIG_NFS_V4 */
2020 return &nfsi->vfs_inode;
2021 }
2022 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2023
2024 static void nfs_i_callback(struct rcu_head *head)
2025 {
2026 struct inode *inode = container_of(head, struct inode, i_rcu);
2027 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2028 }
2029
2030 void nfs_destroy_inode(struct inode *inode)
2031 {
2032 call_rcu(&inode->i_rcu, nfs_i_callback);
2033 }
2034 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
2035
2036 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2037 {
2038 #if IS_ENABLED(CONFIG_NFS_V4)
2039 INIT_LIST_HEAD(&nfsi->open_states);
2040 nfsi->delegation = NULL;
2041 init_rwsem(&nfsi->rwsem);
2042 nfsi->layout = NULL;
2043 #endif
2044 }
2045
2046 static void init_once(void *foo)
2047 {
2048 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2049
2050 inode_init_once(&nfsi->vfs_inode);
2051 INIT_LIST_HEAD(&nfsi->open_files);
2052 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2053 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2054 INIT_LIST_HEAD(&nfsi->commit_info.list);
2055 atomic_long_set(&nfsi->nrequests, 0);
2056 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2057 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2058 init_rwsem(&nfsi->rmdir_sem);
2059 mutex_init(&nfsi->commit_mutex);
2060 nfs4_init_once(nfsi);
2061 }
2062
2063 static int __init nfs_init_inodecache(void)
2064 {
2065 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2066 sizeof(struct nfs_inode),
2067 0, (SLAB_RECLAIM_ACCOUNT|
2068 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2069 init_once);
2070 if (nfs_inode_cachep == NULL)
2071 return -ENOMEM;
2072
2073 return 0;
2074 }
2075
2076 static void nfs_destroy_inodecache(void)
2077 {
2078 /*
2079 * Make sure all delayed rcu free inodes are flushed before we
2080 * destroy cache.
2081 */
2082 rcu_barrier();
2083 kmem_cache_destroy(nfs_inode_cachep);
2084 }
2085
2086 struct workqueue_struct *nfsiod_workqueue;
2087 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2088
2089 /*
2090 * start up the nfsiod workqueue
2091 */
2092 static int nfsiod_start(void)
2093 {
2094 struct workqueue_struct *wq;
2095 dprintk("RPC: creating workqueue nfsiod\n");
2096 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2097 if (wq == NULL)
2098 return -ENOMEM;
2099 nfsiod_workqueue = wq;
2100 return 0;
2101 }
2102
2103 /*
2104 * Destroy the nfsiod workqueue
2105 */
2106 static void nfsiod_stop(void)
2107 {
2108 struct workqueue_struct *wq;
2109
2110 wq = nfsiod_workqueue;
2111 if (wq == NULL)
2112 return;
2113 nfsiod_workqueue = NULL;
2114 destroy_workqueue(wq);
2115 }
2116
2117 unsigned int nfs_net_id;
2118 EXPORT_SYMBOL_GPL(nfs_net_id);
2119
2120 static int nfs_net_init(struct net *net)
2121 {
2122 nfs_clients_init(net);
2123 return nfs_fs_proc_net_init(net);
2124 }
2125
2126 static void nfs_net_exit(struct net *net)
2127 {
2128 struct nfs_net *nn = net_generic(net, nfs_net_id);
2129
2130 nfs_fs_proc_net_exit(net);
2131 nfs_cleanup_cb_ident_idr(net);
2132 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2133 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
2134 }
2135
2136 static struct pernet_operations nfs_net_ops = {
2137 .init = nfs_net_init,
2138 .exit = nfs_net_exit,
2139 .id = &nfs_net_id,
2140 .size = sizeof(struct nfs_net),
2141 };
2142
2143 /*
2144 * Initialize NFS
2145 */
2146 static int __init init_nfs_fs(void)
2147 {
2148 int err;
2149
2150 err = register_pernet_subsys(&nfs_net_ops);
2151 if (err < 0)
2152 goto out9;
2153
2154 err = nfs_fscache_register();
2155 if (err < 0)
2156 goto out8;
2157
2158 err = nfsiod_start();
2159 if (err)
2160 goto out7;
2161
2162 err = nfs_fs_proc_init();
2163 if (err)
2164 goto out6;
2165
2166 err = nfs_init_nfspagecache();
2167 if (err)
2168 goto out5;
2169
2170 err = nfs_init_inodecache();
2171 if (err)
2172 goto out4;
2173
2174 err = nfs_init_readpagecache();
2175 if (err)
2176 goto out3;
2177
2178 err = nfs_init_writepagecache();
2179 if (err)
2180 goto out2;
2181
2182 err = nfs_init_directcache();
2183 if (err)
2184 goto out1;
2185
2186 rpc_proc_register(&init_net, &nfs_rpcstat);
2187
2188 err = register_nfs_fs();
2189 if (err)
2190 goto out0;
2191
2192 return 0;
2193 out0:
2194 rpc_proc_unregister(&init_net, "nfs");
2195 nfs_destroy_directcache();
2196 out1:
2197 nfs_destroy_writepagecache();
2198 out2:
2199 nfs_destroy_readpagecache();
2200 out3:
2201 nfs_destroy_inodecache();
2202 out4:
2203 nfs_destroy_nfspagecache();
2204 out5:
2205 nfs_fs_proc_exit();
2206 out6:
2207 nfsiod_stop();
2208 out7:
2209 nfs_fscache_unregister();
2210 out8:
2211 unregister_pernet_subsys(&nfs_net_ops);
2212 out9:
2213 return err;
2214 }
2215
2216 static void __exit exit_nfs_fs(void)
2217 {
2218 nfs_destroy_directcache();
2219 nfs_destroy_writepagecache();
2220 nfs_destroy_readpagecache();
2221 nfs_destroy_inodecache();
2222 nfs_destroy_nfspagecache();
2223 nfs_fscache_unregister();
2224 unregister_pernet_subsys(&nfs_net_ops);
2225 rpc_proc_unregister(&init_net, "nfs");
2226 unregister_nfs_fs();
2227 nfs_fs_proc_exit();
2228 nfsiod_stop();
2229 }
2230
2231 /* Not quite true; I just maintain it */
2232 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2233 MODULE_LICENSE("GPL");
2234 module_param(enable_ino64, bool, 0644);
2235
2236 module_init(init_nfs_fs)
2237 module_exit(exit_nfs_fs)
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