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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[cris-mirror.git] / fs / nfs / inode.c
blob7d893543cf3b37acdb7afe7ad423cecb63204697
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 int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode)
89 {
90 return nfs_wait_killable(mode);
91 }
92
93 /**
94 * nfs_compat_user_ino64 - returns the user-visible inode number
95 * @fileid: 64-bit fileid
96 *
97 * This function returns a 32-bit inode number if the boot parameter
98 * nfs.enable_ino64 is zero.
99 */
100 u64 nfs_compat_user_ino64(u64 fileid)
101 {
102 #ifdef CONFIG_COMPAT
103 compat_ulong_t ino;
104 #else
105 unsigned long ino;
106 #endif
107
108 if (enable_ino64)
109 return fileid;
110 ino = fileid;
111 if (sizeof(ino) < sizeof(fileid))
112 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
113 return ino;
114 }
115
116 int nfs_drop_inode(struct inode *inode)
117 {
118 return NFS_STALE(inode) || generic_drop_inode(inode);
119 }
120 EXPORT_SYMBOL_GPL(nfs_drop_inode);
121
122 void nfs_clear_inode(struct inode *inode)
123 {
124 /*
125 * The following should never happen...
126 */
127 WARN_ON_ONCE(nfs_have_writebacks(inode));
128 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
129 nfs_zap_acl_cache(inode);
130 nfs_access_zap_cache(inode);
131 nfs_fscache_clear_inode(inode);
132 }
133 EXPORT_SYMBOL_GPL(nfs_clear_inode);
134
135 void nfs_evict_inode(struct inode *inode)
136 {
137 truncate_inode_pages_final(&inode->i_data);
138 clear_inode(inode);
139 nfs_clear_inode(inode);
140 }
141
142 int nfs_sync_inode(struct inode *inode)
143 {
144 inode_dio_wait(inode);
145 return nfs_wb_all(inode);
146 }
147 EXPORT_SYMBOL_GPL(nfs_sync_inode);
148
149 /**
150 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
151 */
152 int nfs_sync_mapping(struct address_space *mapping)
153 {
154 int ret = 0;
155
156 if (mapping->nrpages != 0) {
157 unmap_mapping_range(mapping, 0, 0, 0);
158 ret = nfs_wb_all(mapping->host);
159 }
160 return ret;
161 }
162
163 static int nfs_attribute_timeout(struct inode *inode)
164 {
165 struct nfs_inode *nfsi = NFS_I(inode);
166
167 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
168 }
169
170 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
171 {
172 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
173
174 /* Special case for the pagecache or access cache */
175 if (flags == NFS_INO_REVAL_PAGECACHE &&
176 !(cache_validity & NFS_INO_REVAL_FORCED))
177 return false;
178 return (cache_validity & flags) != 0;
179 }
180
181 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
182 {
183 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
184
185 if ((cache_validity & flags) != 0)
186 return true;
187 if (nfs_attribute_timeout(inode))
188 return true;
189 return false;
190 }
191
192 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
193 {
194 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
195 return nfs_check_cache_invalid_delegated(inode, flags);
196
197 return nfs_check_cache_invalid_not_delegated(inode, flags);
198 }
199
200 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
201 {
202 struct nfs_inode *nfsi = NFS_I(inode);
203
204 if (inode->i_mapping->nrpages == 0)
205 flags &= ~NFS_INO_INVALID_DATA;
206 nfsi->cache_validity |= flags;
207 if (flags & NFS_INO_INVALID_DATA)
208 nfs_fscache_invalidate(inode);
209 }
210
211 /*
212 * Invalidate the local caches
213 */
214 static void nfs_zap_caches_locked(struct inode *inode)
215 {
216 struct nfs_inode *nfsi = NFS_I(inode);
217 int mode = inode->i_mode;
218
219 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
220
221 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
222 nfsi->attrtimeo_timestamp = jiffies;
223
224 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
225 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
226 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
227 | NFS_INO_INVALID_DATA
228 | NFS_INO_INVALID_ACCESS
229 | NFS_INO_INVALID_ACL
230 | NFS_INO_REVAL_PAGECACHE);
231 } else
232 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
233 | NFS_INO_INVALID_ACCESS
234 | NFS_INO_INVALID_ACL
235 | NFS_INO_REVAL_PAGECACHE);
236 nfs_zap_label_cache_locked(nfsi);
237 }
238
239 void nfs_zap_caches(struct inode *inode)
240 {
241 spin_lock(&inode->i_lock);
242 nfs_zap_caches_locked(inode);
243 spin_unlock(&inode->i_lock);
244 }
245
246 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
247 {
248 if (mapping->nrpages != 0) {
249 spin_lock(&inode->i_lock);
250 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
251 spin_unlock(&inode->i_lock);
252 }
253 }
254
255 void nfs_zap_acl_cache(struct inode *inode)
256 {
257 void (*clear_acl_cache)(struct inode *);
258
259 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
260 if (clear_acl_cache != NULL)
261 clear_acl_cache(inode);
262 spin_lock(&inode->i_lock);
263 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
264 spin_unlock(&inode->i_lock);
265 }
266 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
267
268 void nfs_invalidate_atime(struct inode *inode)
269 {
270 spin_lock(&inode->i_lock);
271 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
272 spin_unlock(&inode->i_lock);
273 }
274 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
275
276 /*
277 * Invalidate, but do not unhash, the inode.
278 * NB: must be called with inode->i_lock held!
279 */
280 static void nfs_invalidate_inode(struct inode *inode)
281 {
282 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
283 nfs_zap_caches_locked(inode);
284 }
285
286 struct nfs_find_desc {
287 struct nfs_fh *fh;
288 struct nfs_fattr *fattr;
289 };
290
291 /*
292 * In NFSv3 we can have 64bit inode numbers. In order to support
293 * this, and re-exported directories (also seen in NFSv2)
294 * we are forced to allow 2 different inodes to have the same
295 * i_ino.
296 */
297 static int
298 nfs_find_actor(struct inode *inode, void *opaque)
299 {
300 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
301 struct nfs_fh *fh = desc->fh;
302 struct nfs_fattr *fattr = desc->fattr;
303
304 if (NFS_FILEID(inode) != fattr->fileid)
305 return 0;
306 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
307 return 0;
308 if (nfs_compare_fh(NFS_FH(inode), fh))
309 return 0;
310 if (is_bad_inode(inode) || NFS_STALE(inode))
311 return 0;
312 return 1;
313 }
314
315 static int
316 nfs_init_locked(struct inode *inode, void *opaque)
317 {
318 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
319 struct nfs_fattr *fattr = desc->fattr;
320
321 set_nfs_fileid(inode, fattr->fileid);
322 inode->i_mode = fattr->mode;
323 nfs_copy_fh(NFS_FH(inode), desc->fh);
324 return 0;
325 }
326
327 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
328 static void nfs_clear_label_invalid(struct inode *inode)
329 {
330 spin_lock(&inode->i_lock);
331 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
332 spin_unlock(&inode->i_lock);
333 }
334
335 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
336 struct nfs4_label *label)
337 {
338 int error;
339
340 if (label == NULL)
341 return;
342
343 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
344 error = security_inode_notifysecctx(inode, label->label,
345 label->len);
346 if (error)
347 printk(KERN_ERR "%s() %s %d "
348 "security_inode_notifysecctx() %d\n",
349 __func__,
350 (char *)label->label,
351 label->len, error);
352 nfs_clear_label_invalid(inode);
353 }
354 }
355
356 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
357 {
358 struct nfs4_label *label = NULL;
359 int minor_version = server->nfs_client->cl_minorversion;
360
361 if (minor_version < 2)
362 return label;
363
364 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
365 return label;
366
367 label = kzalloc(sizeof(struct nfs4_label), flags);
368 if (label == NULL)
369 return ERR_PTR(-ENOMEM);
370
371 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
372 if (label->label == NULL) {
373 kfree(label);
374 return ERR_PTR(-ENOMEM);
375 }
376 label->len = NFS4_MAXLABELLEN;
377
378 return label;
379 }
380 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
381 #else
382 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
383 struct nfs4_label *label)
384 {
385 }
386 #endif
387 EXPORT_SYMBOL_GPL(nfs_setsecurity);
388
389 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
390 struct inode *
391 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
392 {
393 struct nfs_find_desc desc = {
394 .fh = fh,
395 .fattr = fattr,
396 };
397 struct inode *inode;
398 unsigned long hash;
399
400 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
401 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
402 return NULL;
403
404 hash = nfs_fattr_to_ino_t(fattr);
405 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
406
407 dprintk("%s: returning %p\n", __func__, inode);
408 return inode;
409 }
410
411 /*
412 * This is our front-end to iget that looks up inodes by file handle
413 * instead of inode number.
414 */
415 struct inode *
416 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
417 {
418 struct nfs_find_desc desc = {
419 .fh = fh,
420 .fattr = fattr
421 };
422 struct inode *inode = ERR_PTR(-ENOENT);
423 unsigned long hash;
424
425 nfs_attr_check_mountpoint(sb, fattr);
426
427 if (nfs_attr_use_mounted_on_fileid(fattr))
428 fattr->fileid = fattr->mounted_on_fileid;
429 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
430 goto out_no_inode;
431 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
432 goto out_no_inode;
433
434 hash = nfs_fattr_to_ino_t(fattr);
435
436 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
437 if (inode == NULL) {
438 inode = ERR_PTR(-ENOMEM);
439 goto out_no_inode;
440 }
441
442 if (inode->i_state & I_NEW) {
443 struct nfs_inode *nfsi = NFS_I(inode);
444 unsigned long now = jiffies;
445
446 /* We set i_ino for the few things that still rely on it,
447 * such as stat(2) */
448 inode->i_ino = hash;
449
450 /* We can't support update_atime(), since the server will reset it */
451 inode->i_flags |= S_NOATIME|S_NOCMTIME;
452 inode->i_mode = fattr->mode;
453 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
454 && nfs_server_capable(inode, NFS_CAP_MODE))
455 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
456 /* Why so? Because we want revalidate for devices/FIFOs, and
457 * that's precisely what we have in nfs_file_inode_operations.
458 */
459 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
460 if (S_ISREG(inode->i_mode)) {
461 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
462 inode->i_data.a_ops = &nfs_file_aops;
463 } else if (S_ISDIR(inode->i_mode)) {
464 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
465 inode->i_fop = &nfs_dir_operations;
466 inode->i_data.a_ops = &nfs_dir_aops;
467 /* Deal with crossing mountpoints */
468 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
469 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
470 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
471 inode->i_op = &nfs_referral_inode_operations;
472 else
473 inode->i_op = &nfs_mountpoint_inode_operations;
474 inode->i_fop = NULL;
475 inode->i_flags |= S_AUTOMOUNT;
476 }
477 } else if (S_ISLNK(inode->i_mode)) {
478 inode->i_op = &nfs_symlink_inode_operations;
479 inode_nohighmem(inode);
480 } else
481 init_special_inode(inode, inode->i_mode, fattr->rdev);
482
483 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
484 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
485 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
486 inode_set_iversion_raw(inode, 0);
487 inode->i_size = 0;
488 clear_nlink(inode);
489 inode->i_uid = make_kuid(&init_user_ns, -2);
490 inode->i_gid = make_kgid(&init_user_ns, -2);
491 inode->i_blocks = 0;
492 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
493 nfsi->write_io = 0;
494 nfsi->read_io = 0;
495
496 nfsi->read_cache_jiffies = fattr->time_start;
497 nfsi->attr_gencount = fattr->gencount;
498 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
499 inode->i_atime = fattr->atime;
500 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
501 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
502 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
503 inode->i_mtime = fattr->mtime;
504 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
505 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
506 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
507 inode->i_ctime = fattr->ctime;
508 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
510 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
511 inode_set_iversion_raw(inode, fattr->change_attr);
512 else
513 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
514 | NFS_INO_REVAL_PAGECACHE);
515 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
516 inode->i_size = nfs_size_to_loff_t(fattr->size);
517 else
518 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
519 | NFS_INO_REVAL_PAGECACHE);
520 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
521 set_nlink(inode, fattr->nlink);
522 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
524 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
525 inode->i_uid = fattr->uid;
526 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
528 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
529 inode->i_gid = fattr->gid;
530 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
532 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
533 inode->i_blocks = fattr->du.nfs2.blocks;
534 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
535 /*
536 * report the blocks in 512byte units
537 */
538 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
539 }
540
541 nfs_setsecurity(inode, fattr, label);
542
543 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
544 nfsi->attrtimeo_timestamp = now;
545 nfsi->access_cache = RB_ROOT;
546
547 nfs_fscache_init_inode(inode);
548
549 unlock_new_inode(inode);
550 } else {
551 int err = nfs_refresh_inode(inode, fattr);
552 if (err < 0) {
553 iput(inode);
554 inode = ERR_PTR(err);
555 goto out_no_inode;
556 }
557 }
558 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
559 inode->i_sb->s_id,
560 (unsigned long long)NFS_FILEID(inode),
561 nfs_display_fhandle_hash(fh),
562 atomic_read(&inode->i_count));
563
564 out:
565 return inode;
566
567 out_no_inode:
568 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
569 goto out;
570 }
571 EXPORT_SYMBOL_GPL(nfs_fhget);
572
573 #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)
574
575 int
576 nfs_setattr(struct dentry *dentry, struct iattr *attr)
577 {
578 struct inode *inode = d_inode(dentry);
579 struct nfs_fattr *fattr;
580 int error = 0;
581
582 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
583
584 /* skip mode change if it's just for clearing setuid/setgid */
585 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
586 attr->ia_valid &= ~ATTR_MODE;
587
588 if (attr->ia_valid & ATTR_SIZE) {
589 BUG_ON(!S_ISREG(inode->i_mode));
590
591 error = inode_newsize_ok(inode, attr->ia_size);
592 if (error)
593 return error;
594
595 if (attr->ia_size == i_size_read(inode))
596 attr->ia_valid &= ~ATTR_SIZE;
597 }
598
599 /* Optimization: if the end result is no change, don't RPC */
600 attr->ia_valid &= NFS_VALID_ATTRS;
601 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
602 return 0;
603
604 trace_nfs_setattr_enter(inode);
605
606 /* Write all dirty data */
607 if (S_ISREG(inode->i_mode))
608 nfs_sync_inode(inode);
609
610 fattr = nfs_alloc_fattr();
611 if (fattr == NULL) {
612 error = -ENOMEM;
613 goto out;
614 }
615
616 /*
617 * Return any delegations if we're going to change ACLs
618 */
619 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
620 NFS_PROTO(inode)->return_delegation(inode);
621 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
622 if (error == 0)
623 error = nfs_refresh_inode(inode, fattr);
624 nfs_free_fattr(fattr);
625 out:
626 trace_nfs_setattr_exit(inode, error);
627 return error;
628 }
629 EXPORT_SYMBOL_GPL(nfs_setattr);
630
631 /**
632 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
633 * @inode: inode of the file used
634 * @offset: file offset to start truncating
635 *
636 * This is a copy of the common vmtruncate, but with the locking
637 * corrected to take into account the fact that NFS requires
638 * inode->i_size to be updated under the inode->i_lock.
639 * Note: must be called with inode->i_lock held!
640 */
641 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
642 {
643 int err;
644
645 err = inode_newsize_ok(inode, offset);
646 if (err)
647 goto out;
648
649 i_size_write(inode, offset);
650 /* Optimisation */
651 if (offset == 0)
652 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
653
654 spin_unlock(&inode->i_lock);
655 truncate_pagecache(inode, offset);
656 spin_lock(&inode->i_lock);
657 out:
658 return err;
659 }
660
661 /**
662 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
663 * @inode: pointer to struct inode
664 * @attr: pointer to struct iattr
665 *
666 * Note: we do this in the *proc.c in order to ensure that
667 * it works for things like exclusive creates too.
668 */
669 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
670 struct nfs_fattr *fattr)
671 {
672 /* Barrier: bump the attribute generation count. */
673 nfs_fattr_set_barrier(fattr);
674
675 spin_lock(&inode->i_lock);
676 NFS_I(inode)->attr_gencount = fattr->gencount;
677 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
678 if ((attr->ia_valid & ATTR_MODE) != 0) {
679 int mode = attr->ia_mode & S_IALLUGO;
680 mode |= inode->i_mode & ~S_IALLUGO;
681 inode->i_mode = mode;
682 }
683 if ((attr->ia_valid & ATTR_UID) != 0)
684 inode->i_uid = attr->ia_uid;
685 if ((attr->ia_valid & ATTR_GID) != 0)
686 inode->i_gid = attr->ia_gid;
687 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
688 | NFS_INO_INVALID_ACL);
689 }
690 if ((attr->ia_valid & ATTR_SIZE) != 0) {
691 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
692 nfs_vmtruncate(inode, attr->ia_size);
693 }
694 if (fattr->valid)
695 nfs_update_inode(inode, fattr);
696 else
697 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
698 spin_unlock(&inode->i_lock);
699 }
700 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
701
702 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
703 {
704 struct dentry *parent;
705
706 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
707 return;
708 parent = dget_parent(dentry);
709 nfs_force_use_readdirplus(d_inode(parent));
710 dput(parent);
711 }
712
713 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
714 {
715 struct dentry *parent;
716
717 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
718 return;
719 parent = dget_parent(dentry);
720 nfs_advise_use_readdirplus(d_inode(parent));
721 dput(parent);
722 }
723
724 static bool nfs_need_revalidate_inode(struct inode *inode)
725 {
726 if (NFS_I(inode)->cache_validity &
727 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
728 return true;
729 if (nfs_attribute_cache_expired(inode))
730 return true;
731 return false;
732 }
733
734 int nfs_getattr(const struct path *path, struct kstat *stat,
735 u32 request_mask, unsigned int query_flags)
736 {
737 struct inode *inode = d_inode(path->dentry);
738 struct nfs_server *server = NFS_SERVER(inode);
739 unsigned long cache_validity;
740 int err = 0;
741 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
742 bool do_update = false;
743
744 trace_nfs_getattr_enter(inode);
745
746 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
747 goto out_no_update;
748
749 /* Flush out writes to the server in order to update c/mtime. */
750 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
751 S_ISREG(inode->i_mode)) {
752 err = filemap_write_and_wait(inode->i_mapping);
753 if (err)
754 goto out;
755 }
756
757 /*
758 * We may force a getattr if the user cares about atime.
759 *
760 * Note that we only have to check the vfsmount flags here:
761 * - NFS always sets S_NOATIME by so checking it would give a
762 * bogus result
763 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
764 * no point in checking those.
765 */
766 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
767 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
768 request_mask &= ~STATX_ATIME;
769
770 /* Is the user requesting attributes that might need revalidation? */
771 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
772 STATX_MTIME|STATX_UID|STATX_GID|
773 STATX_SIZE|STATX_BLOCKS)))
774 goto out_no_revalidate;
775
776 /* Check whether the cached attributes are stale */
777 do_update |= force_sync || nfs_attribute_cache_expired(inode);
778 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
779 do_update |= cache_validity &
780 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
781 if (request_mask & STATX_ATIME)
782 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
783 if (request_mask & (STATX_CTIME|STATX_MTIME))
784 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
785 if (do_update) {
786 /* Update the attribute cache */
787 if (!(server->flags & NFS_MOUNT_NOAC))
788 nfs_readdirplus_parent_cache_miss(path->dentry);
789 else
790 nfs_readdirplus_parent_cache_hit(path->dentry);
791 err = __nfs_revalidate_inode(server, inode);
792 if (err)
793 goto out;
794 } else
795 nfs_readdirplus_parent_cache_hit(path->dentry);
796 out_no_revalidate:
797 /* Only return attributes that were revalidated. */
798 stat->result_mask &= request_mask;
799 out_no_update:
800 generic_fillattr(inode, stat);
801 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
802 if (S_ISDIR(inode->i_mode))
803 stat->blksize = NFS_SERVER(inode)->dtsize;
804 out:
805 trace_nfs_getattr_exit(inode, err);
806 return err;
807 }
808 EXPORT_SYMBOL_GPL(nfs_getattr);
809
810 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
811 {
812 refcount_set(&l_ctx->count, 1);
813 l_ctx->lockowner = current->files;
814 INIT_LIST_HEAD(&l_ctx->list);
815 atomic_set(&l_ctx->io_count, 0);
816 }
817
818 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
819 {
820 struct nfs_lock_context *head = &ctx->lock_context;
821 struct nfs_lock_context *pos = head;
822
823 do {
824 if (pos->lockowner != current->files)
825 continue;
826 refcount_inc(&pos->count);
827 return pos;
828 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
829 return NULL;
830 }
831
832 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
833 {
834 struct nfs_lock_context *res, *new = NULL;
835 struct inode *inode = d_inode(ctx->dentry);
836
837 spin_lock(&inode->i_lock);
838 res = __nfs_find_lock_context(ctx);
839 if (res == NULL) {
840 spin_unlock(&inode->i_lock);
841 new = kmalloc(sizeof(*new), GFP_KERNEL);
842 if (new == NULL)
843 return ERR_PTR(-ENOMEM);
844 nfs_init_lock_context(new);
845 spin_lock(&inode->i_lock);
846 res = __nfs_find_lock_context(ctx);
847 if (res == NULL) {
848 list_add_tail(&new->list, &ctx->lock_context.list);
849 new->open_context = ctx;
850 res = new;
851 new = NULL;
852 }
853 }
854 spin_unlock(&inode->i_lock);
855 kfree(new);
856 return res;
857 }
858 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
859
860 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
861 {
862 struct nfs_open_context *ctx = l_ctx->open_context;
863 struct inode *inode = d_inode(ctx->dentry);
864
865 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
866 return;
867 list_del(&l_ctx->list);
868 spin_unlock(&inode->i_lock);
869 kfree(l_ctx);
870 }
871 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
872
873 /**
874 * nfs_close_context - Common close_context() routine NFSv2/v3
875 * @ctx: pointer to context
876 * @is_sync: is this a synchronous close
877 *
878 * Ensure that the attributes are up to date if we're mounted
879 * with close-to-open semantics and we have cached data that will
880 * need to be revalidated on open.
881 */
882 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
883 {
884 struct nfs_inode *nfsi;
885 struct inode *inode;
886 struct nfs_server *server;
887
888 if (!(ctx->mode & FMODE_WRITE))
889 return;
890 if (!is_sync)
891 return;
892 inode = d_inode(ctx->dentry);
893 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
894 return;
895 nfsi = NFS_I(inode);
896 if (inode->i_mapping->nrpages == 0)
897 return;
898 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
899 return;
900 if (!list_empty(&nfsi->open_files))
901 return;
902 server = NFS_SERVER(inode);
903 if (server->flags & NFS_MOUNT_NOCTO)
904 return;
905 nfs_revalidate_inode(server, inode);
906 }
907 EXPORT_SYMBOL_GPL(nfs_close_context);
908
909 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
910 fmode_t f_mode,
911 struct file *filp)
912 {
913 struct nfs_open_context *ctx;
914 struct rpc_cred *cred = rpc_lookup_cred();
915 if (IS_ERR(cred))
916 return ERR_CAST(cred);
917
918 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
919 if (!ctx) {
920 put_rpccred(cred);
921 return ERR_PTR(-ENOMEM);
922 }
923 nfs_sb_active(dentry->d_sb);
924 ctx->dentry = dget(dentry);
925 ctx->cred = cred;
926 ctx->state = NULL;
927 ctx->mode = f_mode;
928 ctx->flags = 0;
929 ctx->error = 0;
930 ctx->flock_owner = (fl_owner_t)filp;
931 nfs_init_lock_context(&ctx->lock_context);
932 ctx->lock_context.open_context = ctx;
933 INIT_LIST_HEAD(&ctx->list);
934 ctx->mdsthreshold = NULL;
935 return ctx;
936 }
937 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
938
939 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
940 {
941 if (ctx != NULL)
942 refcount_inc(&ctx->lock_context.count);
943 return ctx;
944 }
945 EXPORT_SYMBOL_GPL(get_nfs_open_context);
946
947 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
948 {
949 struct inode *inode = d_inode(ctx->dentry);
950 struct super_block *sb = ctx->dentry->d_sb;
951
952 if (!list_empty(&ctx->list)) {
953 if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
954 return;
955 list_del(&ctx->list);
956 spin_unlock(&inode->i_lock);
957 } else if (!refcount_dec_and_test(&ctx->lock_context.count))
958 return;
959 if (inode != NULL)
960 NFS_PROTO(inode)->close_context(ctx, is_sync);
961 if (ctx->cred != NULL)
962 put_rpccred(ctx->cred);
963 dput(ctx->dentry);
964 nfs_sb_deactive(sb);
965 kfree(ctx->mdsthreshold);
966 kfree(ctx);
967 }
968
969 void put_nfs_open_context(struct nfs_open_context *ctx)
970 {
971 __put_nfs_open_context(ctx, 0);
972 }
973 EXPORT_SYMBOL_GPL(put_nfs_open_context);
974
975 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
976 {
977 __put_nfs_open_context(ctx, 1);
978 }
979
980 /*
981 * Ensure that mmap has a recent RPC credential for use when writing out
982 * shared pages
983 */
984 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
985 {
986 struct inode *inode = d_inode(ctx->dentry);
987 struct nfs_inode *nfsi = NFS_I(inode);
988
989 spin_lock(&inode->i_lock);
990 if (ctx->mode & FMODE_WRITE)
991 list_add(&ctx->list, &nfsi->open_files);
992 else
993 list_add_tail(&ctx->list, &nfsi->open_files);
994 spin_unlock(&inode->i_lock);
995 }
996 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
997
998 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
999 {
1000 filp->private_data = get_nfs_open_context(ctx);
1001 if (list_empty(&ctx->list))
1002 nfs_inode_attach_open_context(ctx);
1003 }
1004 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1005
1006 /*
1007 * Given an inode, search for an open context with the desired characteristics
1008 */
1009 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1010 {
1011 struct nfs_inode *nfsi = NFS_I(inode);
1012 struct nfs_open_context *pos, *ctx = NULL;
1013
1014 spin_lock(&inode->i_lock);
1015 list_for_each_entry(pos, &nfsi->open_files, list) {
1016 if (cred != NULL && pos->cred != cred)
1017 continue;
1018 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1019 continue;
1020 ctx = get_nfs_open_context(pos);
1021 break;
1022 }
1023 spin_unlock(&inode->i_lock);
1024 return ctx;
1025 }
1026
1027 void nfs_file_clear_open_context(struct file *filp)
1028 {
1029 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1030
1031 if (ctx) {
1032 struct inode *inode = d_inode(ctx->dentry);
1033
1034 /*
1035 * We fatal error on write before. Try to writeback
1036 * every page again.
1037 */
1038 if (ctx->error < 0)
1039 invalidate_inode_pages2(inode->i_mapping);
1040 filp->private_data = NULL;
1041 spin_lock(&inode->i_lock);
1042 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1043 spin_unlock(&inode->i_lock);
1044 put_nfs_open_context_sync(ctx);
1045 }
1046 }
1047
1048 /*
1049 * These allocate and release file read/write context information.
1050 */
1051 int nfs_open(struct inode *inode, struct file *filp)
1052 {
1053 struct nfs_open_context *ctx;
1054
1055 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1056 if (IS_ERR(ctx))
1057 return PTR_ERR(ctx);
1058 nfs_file_set_open_context(filp, ctx);
1059 put_nfs_open_context(ctx);
1060 nfs_fscache_open_file(inode, filp);
1061 return 0;
1062 }
1063
1064 /*
1065 * This function is called whenever some part of NFS notices that
1066 * the cached attributes have to be refreshed.
1067 */
1068 int
1069 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1070 {
1071 int status = -ESTALE;
1072 struct nfs4_label *label = NULL;
1073 struct nfs_fattr *fattr = NULL;
1074 struct nfs_inode *nfsi = NFS_I(inode);
1075
1076 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1077 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1078
1079 trace_nfs_revalidate_inode_enter(inode);
1080
1081 if (is_bad_inode(inode))
1082 goto out;
1083 if (NFS_STALE(inode))
1084 goto out;
1085
1086 /* pNFS: Attributes aren't updated until we layoutcommit */
1087 if (S_ISREG(inode->i_mode)) {
1088 status = pnfs_sync_inode(inode, false);
1089 if (status)
1090 goto out;
1091 }
1092
1093 status = -ENOMEM;
1094 fattr = nfs_alloc_fattr();
1095 if (fattr == NULL)
1096 goto out;
1097
1098 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1099
1100 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1101 if (IS_ERR(label)) {
1102 status = PTR_ERR(label);
1103 goto out;
1104 }
1105
1106 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1107 if (status != 0) {
1108 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1109 inode->i_sb->s_id,
1110 (unsigned long long)NFS_FILEID(inode), status);
1111 if (status == -ESTALE) {
1112 nfs_zap_caches(inode);
1113 if (!S_ISDIR(inode->i_mode))
1114 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1115 }
1116 goto err_out;
1117 }
1118
1119 status = nfs_refresh_inode(inode, fattr);
1120 if (status) {
1121 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1122 inode->i_sb->s_id,
1123 (unsigned long long)NFS_FILEID(inode), status);
1124 goto err_out;
1125 }
1126
1127 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1128 nfs_zap_acl_cache(inode);
1129
1130 nfs_setsecurity(inode, fattr, label);
1131
1132 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1133 inode->i_sb->s_id,
1134 (unsigned long long)NFS_FILEID(inode));
1135
1136 err_out:
1137 nfs4_label_free(label);
1138 out:
1139 nfs_free_fattr(fattr);
1140 trace_nfs_revalidate_inode_exit(inode, status);
1141 return status;
1142 }
1143
1144 int nfs_attribute_cache_expired(struct inode *inode)
1145 {
1146 if (nfs_have_delegated_attributes(inode))
1147 return 0;
1148 return nfs_attribute_timeout(inode);
1149 }
1150
1151 /**
1152 * nfs_revalidate_inode - Revalidate the inode attributes
1153 * @server - pointer to nfs_server struct
1154 * @inode - pointer to inode struct
1155 *
1156 * Updates inode attribute information by retrieving the data from the server.
1157 */
1158 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1159 {
1160 if (!nfs_need_revalidate_inode(inode))
1161 return NFS_STALE(inode) ? -ESTALE : 0;
1162 return __nfs_revalidate_inode(server, inode);
1163 }
1164 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1165
1166 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1167 {
1168 struct nfs_inode *nfsi = NFS_I(inode);
1169 int ret;
1170
1171 if (mapping->nrpages != 0) {
1172 if (S_ISREG(inode->i_mode)) {
1173 ret = nfs_sync_mapping(mapping);
1174 if (ret < 0)
1175 return ret;
1176 }
1177 ret = invalidate_inode_pages2(mapping);
1178 if (ret < 0)
1179 return ret;
1180 }
1181 if (S_ISDIR(inode->i_mode)) {
1182 spin_lock(&inode->i_lock);
1183 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1184 spin_unlock(&inode->i_lock);
1185 }
1186 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1187 nfs_fscache_wait_on_invalidate(inode);
1188
1189 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1190 inode->i_sb->s_id,
1191 (unsigned long long)NFS_FILEID(inode));
1192 return 0;
1193 }
1194
1195 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1196 {
1197 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1198 NFS_STALE(inode);
1199 }
1200
1201 int nfs_revalidate_mapping_rcu(struct inode *inode)
1202 {
1203 struct nfs_inode *nfsi = NFS_I(inode);
1204 unsigned long *bitlock = &nfsi->flags;
1205 int ret = 0;
1206
1207 if (IS_SWAPFILE(inode))
1208 goto out;
1209 if (nfs_mapping_need_revalidate_inode(inode)) {
1210 ret = -ECHILD;
1211 goto out;
1212 }
1213 spin_lock(&inode->i_lock);
1214 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1215 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1216 ret = -ECHILD;
1217 spin_unlock(&inode->i_lock);
1218 out:
1219 return ret;
1220 }
1221
1222 /**
1223 * nfs_revalidate_mapping - Revalidate the pagecache
1224 * @inode - pointer to host inode
1225 * @mapping - pointer to mapping
1226 */
1227 int nfs_revalidate_mapping(struct inode *inode,
1228 struct address_space *mapping)
1229 {
1230 struct nfs_inode *nfsi = NFS_I(inode);
1231 unsigned long *bitlock = &nfsi->flags;
1232 int ret = 0;
1233
1234 /* swapfiles are not supposed to be shared. */
1235 if (IS_SWAPFILE(inode))
1236 goto out;
1237
1238 if (nfs_mapping_need_revalidate_inode(inode)) {
1239 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1240 if (ret < 0)
1241 goto out;
1242 }
1243
1244 /*
1245 * We must clear NFS_INO_INVALID_DATA first to ensure that
1246 * invalidations that come in while we're shooting down the mappings
1247 * are respected. But, that leaves a race window where one revalidator
1248 * can clear the flag, and then another checks it before the mapping
1249 * gets invalidated. Fix that by serializing access to this part of
1250 * the function.
1251 *
1252 * At the same time, we need to allow other tasks to see whether we
1253 * might be in the middle of invalidating the pages, so we only set
1254 * the bit lock here if it looks like we're going to be doing that.
1255 */
1256 for (;;) {
1257 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1258 nfs_wait_bit_killable, TASK_KILLABLE);
1259 if (ret)
1260 goto out;
1261 spin_lock(&inode->i_lock);
1262 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1263 spin_unlock(&inode->i_lock);
1264 continue;
1265 }
1266 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1267 break;
1268 spin_unlock(&inode->i_lock);
1269 goto out;
1270 }
1271
1272 set_bit(NFS_INO_INVALIDATING, bitlock);
1273 smp_wmb();
1274 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1275 spin_unlock(&inode->i_lock);
1276 trace_nfs_invalidate_mapping_enter(inode);
1277 ret = nfs_invalidate_mapping(inode, mapping);
1278 trace_nfs_invalidate_mapping_exit(inode, ret);
1279
1280 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1281 smp_mb__after_atomic();
1282 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1283 out:
1284 return ret;
1285 }
1286
1287 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1288 {
1289 struct inode *inode = &nfsi->vfs_inode;
1290
1291 assert_spin_locked(&inode->i_lock);
1292
1293 if (!S_ISREG(inode->i_mode))
1294 return false;
1295 if (list_empty(&nfsi->open_files))
1296 return false;
1297 /* Note: This relies on nfsi->open_files being ordered with writers
1298 * being placed at the head of the list.
1299 * See nfs_inode_attach_open_context()
1300 */
1301 return (list_first_entry(&nfsi->open_files,
1302 struct nfs_open_context,
1303 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1304 }
1305
1306 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1307 {
1308 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1309 }
1310
1311 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1312 {
1313 unsigned long ret = 0;
1314
1315 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1316 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1317 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1318 inode_set_iversion_raw(inode, fattr->change_attr);
1319 if (S_ISDIR(inode->i_mode))
1320 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1321 ret |= NFS_INO_INVALID_ATTR;
1322 }
1323 /* If we have atomic WCC data, we may update some attributes */
1324 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1325 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1326 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1327 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1328 ret |= NFS_INO_INVALID_ATTR;
1329 }
1330
1331 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1332 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1333 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1334 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1335 if (S_ISDIR(inode->i_mode))
1336 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1337 ret |= NFS_INO_INVALID_ATTR;
1338 }
1339 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1340 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1341 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1342 && !nfs_have_writebacks(inode)) {
1343 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1344 ret |= NFS_INO_INVALID_ATTR;
1345 }
1346
1347 return ret;
1348 }
1349
1350 /**
1351 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1352 * @inode - pointer to inode
1353 * @fattr - updated attributes
1354 *
1355 * Verifies the attribute cache. If we have just changed the attributes,
1356 * so that fattr carries weak cache consistency data, then it may
1357 * also update the ctime/mtime/change_attribute.
1358 */
1359 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1360 {
1361 struct nfs_inode *nfsi = NFS_I(inode);
1362 loff_t cur_size, new_isize;
1363 unsigned long invalid = 0;
1364
1365
1366 if (nfs_have_delegated_attributes(inode))
1367 return 0;
1368 /* Has the inode gone and changed behind our back? */
1369 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1370 return -ESTALE;
1371 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1372 return -ESTALE;
1373
1374 if (!nfs_file_has_buffered_writers(nfsi)) {
1375 /* Verify a few of the more important attributes */
1376 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1377 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1378
1379 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1380 invalid |= NFS_INO_INVALID_ATTR;
1381
1382 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1383 invalid |= NFS_INO_INVALID_ATTR;
1384
1385 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1386 cur_size = i_size_read(inode);
1387 new_isize = nfs_size_to_loff_t(fattr->size);
1388 if (cur_size != new_isize)
1389 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1390 }
1391 }
1392
1393 /* Have any file permissions changed? */
1394 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1395 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1396 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1397 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1398 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1399 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
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_ATTR;
1404
1405 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1406 invalid |= NFS_INO_INVALID_ATIME;
1407
1408 if (invalid != 0)
1409 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1410
1411 nfsi->read_cache_jiffies = fattr->time_start;
1412 return 0;
1413 }
1414
1415 static atomic_long_t nfs_attr_generation_counter;
1416
1417 static unsigned long nfs_read_attr_generation_counter(void)
1418 {
1419 return atomic_long_read(&nfs_attr_generation_counter);
1420 }
1421
1422 unsigned long nfs_inc_attr_generation_counter(void)
1423 {
1424 return atomic_long_inc_return(&nfs_attr_generation_counter);
1425 }
1426 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1427
1428 void nfs_fattr_init(struct nfs_fattr *fattr)
1429 {
1430 fattr->valid = 0;
1431 fattr->time_start = jiffies;
1432 fattr->gencount = nfs_inc_attr_generation_counter();
1433 fattr->owner_name = NULL;
1434 fattr->group_name = NULL;
1435 }
1436 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1437
1438 /**
1439 * nfs_fattr_set_barrier
1440 * @fattr: attributes
1441 *
1442 * Used to set a barrier after an attribute was updated. This
1443 * barrier ensures that older attributes from RPC calls that may
1444 * have raced with our update cannot clobber these new values.
1445 * Note that you are still responsible for ensuring that other
1446 * operations which change the attribute on the server do not
1447 * collide.
1448 */
1449 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1450 {
1451 fattr->gencount = nfs_inc_attr_generation_counter();
1452 }
1453
1454 struct nfs_fattr *nfs_alloc_fattr(void)
1455 {
1456 struct nfs_fattr *fattr;
1457
1458 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1459 if (fattr != NULL)
1460 nfs_fattr_init(fattr);
1461 return fattr;
1462 }
1463 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1464
1465 struct nfs_fh *nfs_alloc_fhandle(void)
1466 {
1467 struct nfs_fh *fh;
1468
1469 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1470 if (fh != NULL)
1471 fh->size = 0;
1472 return fh;
1473 }
1474 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1475
1476 #ifdef NFS_DEBUG
1477 /*
1478 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1479 * in the same way that wireshark does
1480 *
1481 * @fh: file handle
1482 *
1483 * For debugging only.
1484 */
1485 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1486 {
1487 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1488 * not on the result */
1489 return nfs_fhandle_hash(fh);
1490 }
1491 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1492
1493 /*
1494 * _nfs_display_fhandle - display an NFS file handle on the console
1495 *
1496 * @fh: file handle to display
1497 * @caption: display caption
1498 *
1499 * For debugging only.
1500 */
1501 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1502 {
1503 unsigned short i;
1504
1505 if (fh == NULL || fh->size == 0) {
1506 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1507 return;
1508 }
1509
1510 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1511 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1512 for (i = 0; i < fh->size; i += 16) {
1513 __be32 *pos = (__be32 *)&fh->data[i];
1514
1515 switch ((fh->size - i - 1) >> 2) {
1516 case 0:
1517 printk(KERN_DEFAULT " %08x\n",
1518 be32_to_cpup(pos));
1519 break;
1520 case 1:
1521 printk(KERN_DEFAULT " %08x %08x\n",
1522 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1523 break;
1524 case 2:
1525 printk(KERN_DEFAULT " %08x %08x %08x\n",
1526 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1527 be32_to_cpup(pos + 2));
1528 break;
1529 default:
1530 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1531 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1532 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1533 }
1534 }
1535 }
1536 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1537 #endif
1538
1539 /**
1540 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1541 * @inode - pointer to inode
1542 * @fattr - attributes
1543 *
1544 * Attempt to divine whether or not an RPC call reply carrying stale
1545 * attributes got scheduled after another call carrying updated ones.
1546 *
1547 * To do so, the function first assumes that a more recent ctime means
1548 * that the attributes in fattr are newer, however it also attempt to
1549 * catch the case where ctime either didn't change, or went backwards
1550 * (if someone reset the clock on the server) by looking at whether
1551 * or not this RPC call was started after the inode was last updated.
1552 * Note also the check for wraparound of 'attr_gencount'
1553 *
1554 * The function returns 'true' if it thinks the attributes in 'fattr' are
1555 * more recent than the ones cached in the inode.
1556 *
1557 */
1558 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1559 {
1560 const struct nfs_inode *nfsi = NFS_I(inode);
1561
1562 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1563 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1564 }
1565
1566 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1567 {
1568 int ret;
1569
1570 trace_nfs_refresh_inode_enter(inode);
1571
1572 if (nfs_inode_attrs_need_update(inode, fattr))
1573 ret = nfs_update_inode(inode, fattr);
1574 else
1575 ret = nfs_check_inode_attributes(inode, fattr);
1576
1577 trace_nfs_refresh_inode_exit(inode, ret);
1578 return ret;
1579 }
1580
1581 /**
1582 * nfs_refresh_inode - try to update the inode attribute cache
1583 * @inode - pointer to inode
1584 * @fattr - updated attributes
1585 *
1586 * Check that an RPC call that returned attributes has not overlapped with
1587 * other recent updates of the inode metadata, then decide whether it is
1588 * safe to do a full update of the inode attributes, or whether just to
1589 * call nfs_check_inode_attributes.
1590 */
1591 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1592 {
1593 int status;
1594
1595 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1596 return 0;
1597 spin_lock(&inode->i_lock);
1598 status = nfs_refresh_inode_locked(inode, fattr);
1599 spin_unlock(&inode->i_lock);
1600
1601 return status;
1602 }
1603 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1604
1605 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1606 {
1607 unsigned long invalid = NFS_INO_INVALID_ATTR;
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 spin_unlock(&inode->i_lock);
1639
1640 return status;
1641 }
1642 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1643
1644 /**
1645 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1646 * @inode - pointer to inode
1647 * @fattr - updated attributes
1648 *
1649 * After an operation that has changed the inode metadata, mark the
1650 * attribute cache as being invalid, then try to update it. Fake up
1651 * weak cache consistency data, if none exist.
1652 *
1653 * This function is mainly designed to be used by the ->write_done() functions.
1654 */
1655 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1656 {
1657 int status;
1658
1659 /* Don't do a WCC update if these attributes are already stale */
1660 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1661 !nfs_inode_attrs_need_update(inode, fattr)) {
1662 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1663 | NFS_ATTR_FATTR_PRESIZE
1664 | NFS_ATTR_FATTR_PREMTIME
1665 | NFS_ATTR_FATTR_PRECTIME);
1666 goto out_noforce;
1667 }
1668 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1669 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1670 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1671 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1672 }
1673 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1674 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1675 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1676 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1677 }
1678 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1679 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1680 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1681 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1682 }
1683 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1684 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1685 fattr->pre_size = i_size_read(inode);
1686 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1687 }
1688 out_noforce:
1689 status = nfs_post_op_update_inode_locked(inode, fattr);
1690 return status;
1691 }
1692
1693 /**
1694 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1695 * @inode - pointer to inode
1696 * @fattr - updated attributes
1697 *
1698 * After an operation that has changed the inode metadata, mark the
1699 * attribute cache as being invalid, then try to update it. Fake up
1700 * weak cache consistency data, if none exist.
1701 *
1702 * This function is mainly designed to be used by the ->write_done() functions.
1703 */
1704 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1705 {
1706 int status;
1707
1708 spin_lock(&inode->i_lock);
1709 nfs_fattr_set_barrier(fattr);
1710 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1711 spin_unlock(&inode->i_lock);
1712 return status;
1713 }
1714 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1715
1716
1717 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1718 struct nfs_fattr *fattr)
1719 {
1720 bool ret1 = true, ret2 = true;
1721
1722 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1723 ret1 = (nfsi->fileid == fattr->fileid);
1724 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1725 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1726 return ret1 || ret2;
1727 }
1728
1729 /*
1730 * Many nfs protocol calls return the new file attributes after
1731 * an operation. Here we update the inode to reflect the state
1732 * of the server's inode.
1733 *
1734 * This is a bit tricky because we have to make sure all dirty pages
1735 * have been sent off to the server before calling invalidate_inode_pages.
1736 * To make sure no other process adds more write requests while we try
1737 * our best to flush them, we make them sleep during the attribute refresh.
1738 *
1739 * A very similar scenario holds for the dir cache.
1740 */
1741 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1742 {
1743 struct nfs_server *server;
1744 struct nfs_inode *nfsi = NFS_I(inode);
1745 loff_t cur_isize, new_isize;
1746 unsigned long invalid = 0;
1747 unsigned long now = jiffies;
1748 unsigned long save_cache_validity;
1749 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1750 bool cache_revalidated = true;
1751
1752 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1753 __func__, inode->i_sb->s_id, inode->i_ino,
1754 nfs_display_fhandle_hash(NFS_FH(inode)),
1755 atomic_read(&inode->i_count), fattr->valid);
1756
1757 if (!nfs_fileid_valid(nfsi, fattr)) {
1758 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1759 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1760 NFS_SERVER(inode)->nfs_client->cl_hostname,
1761 inode->i_sb->s_id, (long long)nfsi->fileid,
1762 (long long)fattr->fileid);
1763 goto out_err;
1764 }
1765
1766 /*
1767 * Make sure the inode's type hasn't changed.
1768 */
1769 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1770 /*
1771 * Big trouble! The inode has become a different object.
1772 */
1773 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1774 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1775 goto out_err;
1776 }
1777
1778 server = NFS_SERVER(inode);
1779 /* Update the fsid? */
1780 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1781 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1782 !IS_AUTOMOUNT(inode))
1783 server->fsid = fattr->fsid;
1784
1785 /*
1786 * Update the read time so we don't revalidate too often.
1787 */
1788 nfsi->read_cache_jiffies = fattr->time_start;
1789
1790 save_cache_validity = nfsi->cache_validity;
1791 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1792 | NFS_INO_INVALID_ATIME
1793 | NFS_INO_REVAL_FORCED
1794 | NFS_INO_REVAL_PAGECACHE);
1795
1796 /* Do atomic weak cache consistency updates */
1797 invalid |= nfs_wcc_update_inode(inode, fattr);
1798
1799 if (pnfs_layoutcommit_outstanding(inode)) {
1800 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1801 cache_revalidated = false;
1802 }
1803
1804 /* More cache consistency checks */
1805 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1806 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1807 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1808 inode->i_sb->s_id, inode->i_ino);
1809 /* Could it be a race with writeback? */
1810 if (!have_writers) {
1811 invalid |= NFS_INO_INVALID_ATTR
1812 | NFS_INO_INVALID_DATA
1813 | NFS_INO_INVALID_ACCESS
1814 | NFS_INO_INVALID_ACL;
1815 if (S_ISDIR(inode->i_mode))
1816 nfs_force_lookup_revalidate(inode);
1817 }
1818 inode_set_iversion_raw(inode, fattr->change_attr);
1819 }
1820 } else {
1821 nfsi->cache_validity |= save_cache_validity;
1822 cache_revalidated = false;
1823 }
1824
1825 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1826 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1827 } else if (server->caps & NFS_CAP_MTIME) {
1828 nfsi->cache_validity |= save_cache_validity &
1829 (NFS_INO_INVALID_ATTR
1830 | NFS_INO_REVAL_FORCED);
1831 cache_revalidated = false;
1832 }
1833
1834 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1835 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1836 } else if (server->caps & NFS_CAP_CTIME) {
1837 nfsi->cache_validity |= save_cache_validity &
1838 (NFS_INO_INVALID_ATTR
1839 | NFS_INO_REVAL_FORCED);
1840 cache_revalidated = false;
1841 }
1842
1843 /* Check if our cached file size is stale */
1844 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1845 new_isize = nfs_size_to_loff_t(fattr->size);
1846 cur_isize = i_size_read(inode);
1847 if (new_isize != cur_isize) {
1848 /* Do we perhaps have any outstanding writes, or has
1849 * the file grown beyond our last write? */
1850 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1851 i_size_write(inode, new_isize);
1852 if (!have_writers)
1853 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1854 }
1855 dprintk("NFS: isize change on server for file %s/%ld "
1856 "(%Ld to %Ld)\n",
1857 inode->i_sb->s_id,
1858 inode->i_ino,
1859 (long long)cur_isize,
1860 (long long)new_isize);
1861 }
1862 } else {
1863 nfsi->cache_validity |= save_cache_validity &
1864 (NFS_INO_INVALID_ATTR
1865 | NFS_INO_REVAL_PAGECACHE
1866 | NFS_INO_REVAL_FORCED);
1867 cache_revalidated = false;
1868 }
1869
1870
1871 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1872 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1873 else if (server->caps & NFS_CAP_ATIME) {
1874 nfsi->cache_validity |= save_cache_validity &
1875 (NFS_INO_INVALID_ATIME
1876 | NFS_INO_REVAL_FORCED);
1877 cache_revalidated = false;
1878 }
1879
1880 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1881 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1882 umode_t newmode = inode->i_mode & S_IFMT;
1883 newmode |= fattr->mode & S_IALLUGO;
1884 inode->i_mode = newmode;
1885 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1886 }
1887 } else if (server->caps & NFS_CAP_MODE) {
1888 nfsi->cache_validity |= save_cache_validity &
1889 (NFS_INO_INVALID_ATTR
1890 | NFS_INO_INVALID_ACCESS
1891 | NFS_INO_INVALID_ACL
1892 | NFS_INO_REVAL_FORCED);
1893 cache_revalidated = false;
1894 }
1895
1896 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1897 if (!uid_eq(inode->i_uid, fattr->uid)) {
1898 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1899 inode->i_uid = fattr->uid;
1900 }
1901 } else if (server->caps & NFS_CAP_OWNER) {
1902 nfsi->cache_validity |= save_cache_validity &
1903 (NFS_INO_INVALID_ATTR
1904 | NFS_INO_INVALID_ACCESS
1905 | NFS_INO_INVALID_ACL
1906 | NFS_INO_REVAL_FORCED);
1907 cache_revalidated = false;
1908 }
1909
1910 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1911 if (!gid_eq(inode->i_gid, fattr->gid)) {
1912 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1913 inode->i_gid = fattr->gid;
1914 }
1915 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1916 nfsi->cache_validity |= save_cache_validity &
1917 (NFS_INO_INVALID_ATTR
1918 | NFS_INO_INVALID_ACCESS
1919 | NFS_INO_INVALID_ACL
1920 | NFS_INO_REVAL_FORCED);
1921 cache_revalidated = false;
1922 }
1923
1924 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1925 if (inode->i_nlink != fattr->nlink) {
1926 invalid |= NFS_INO_INVALID_ATTR;
1927 if (S_ISDIR(inode->i_mode))
1928 invalid |= NFS_INO_INVALID_DATA;
1929 set_nlink(inode, fattr->nlink);
1930 }
1931 } else if (server->caps & NFS_CAP_NLINK) {
1932 nfsi->cache_validity |= save_cache_validity &
1933 (NFS_INO_INVALID_ATTR
1934 | NFS_INO_REVAL_FORCED);
1935 cache_revalidated = false;
1936 }
1937
1938 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1939 /*
1940 * report the blocks in 512byte units
1941 */
1942 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1943 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1944 inode->i_blocks = fattr->du.nfs2.blocks;
1945 else
1946 cache_revalidated = false;
1947
1948 /* Update attrtimeo value if we're out of the unstable period */
1949 if (invalid & NFS_INO_INVALID_ATTR) {
1950 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1951 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1952 nfsi->attrtimeo_timestamp = now;
1953 /* Set barrier to be more recent than all outstanding updates */
1954 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1955 } else {
1956 if (cache_revalidated) {
1957 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1958 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1959 nfsi->attrtimeo <<= 1;
1960 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1961 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1962 }
1963 nfsi->attrtimeo_timestamp = now;
1964 }
1965 /* Set the barrier to be more recent than this fattr */
1966 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1967 nfsi->attr_gencount = fattr->gencount;
1968 }
1969
1970 /* Don't declare attrcache up to date if there were no attrs! */
1971 if (cache_revalidated)
1972 invalid &= ~NFS_INO_INVALID_ATTR;
1973
1974 /* Don't invalidate the data if we were to blame */
1975 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1976 || S_ISLNK(inode->i_mode)))
1977 invalid &= ~NFS_INO_INVALID_DATA;
1978 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1979 (save_cache_validity & NFS_INO_REVAL_FORCED))
1980 nfs_set_cache_invalid(inode, invalid);
1981
1982 return 0;
1983 out_err:
1984 /*
1985 * No need to worry about unhashing the dentry, as the
1986 * lookup validation will know that the inode is bad.
1987 * (But we fall through to invalidate the caches.)
1988 */
1989 nfs_invalidate_inode(inode);
1990 return -ESTALE;
1991 }
1992
1993 struct inode *nfs_alloc_inode(struct super_block *sb)
1994 {
1995 struct nfs_inode *nfsi;
1996 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1997 if (!nfsi)
1998 return NULL;
1999 nfsi->flags = 0UL;
2000 nfsi->cache_validity = 0UL;
2001 #if IS_ENABLED(CONFIG_NFS_V4)
2002 nfsi->nfs4_acl = NULL;
2003 #endif /* CONFIG_NFS_V4 */
2004 return &nfsi->vfs_inode;
2005 }
2006 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2007
2008 static void nfs_i_callback(struct rcu_head *head)
2009 {
2010 struct inode *inode = container_of(head, struct inode, i_rcu);
2011 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2012 }
2013
2014 void nfs_destroy_inode(struct inode *inode)
2015 {
2016 call_rcu(&inode->i_rcu, nfs_i_callback);
2017 }
2018 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
2019
2020 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2021 {
2022 #if IS_ENABLED(CONFIG_NFS_V4)
2023 INIT_LIST_HEAD(&nfsi->open_states);
2024 nfsi->delegation = NULL;
2025 init_rwsem(&nfsi->rwsem);
2026 nfsi->layout = NULL;
2027 #endif
2028 }
2029
2030 static void init_once(void *foo)
2031 {
2032 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2033
2034 inode_init_once(&nfsi->vfs_inode);
2035 INIT_LIST_HEAD(&nfsi->open_files);
2036 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2037 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2038 INIT_LIST_HEAD(&nfsi->commit_info.list);
2039 atomic_long_set(&nfsi->nrequests, 0);
2040 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2041 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2042 init_rwsem(&nfsi->rmdir_sem);
2043 mutex_init(&nfsi->commit_mutex);
2044 nfs4_init_once(nfsi);
2045 }
2046
2047 static int __init nfs_init_inodecache(void)
2048 {
2049 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2050 sizeof(struct nfs_inode),
2051 0, (SLAB_RECLAIM_ACCOUNT|
2052 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2053 init_once);
2054 if (nfs_inode_cachep == NULL)
2055 return -ENOMEM;
2056
2057 return 0;
2058 }
2059
2060 static void nfs_destroy_inodecache(void)
2061 {
2062 /*
2063 * Make sure all delayed rcu free inodes are flushed before we
2064 * destroy cache.
2065 */
2066 rcu_barrier();
2067 kmem_cache_destroy(nfs_inode_cachep);
2068 }
2069
2070 struct workqueue_struct *nfsiod_workqueue;
2071 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2072
2073 /*
2074 * start up the nfsiod workqueue
2075 */
2076 static int nfsiod_start(void)
2077 {
2078 struct workqueue_struct *wq;
2079 dprintk("RPC: creating workqueue nfsiod\n");
2080 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2081 if (wq == NULL)
2082 return -ENOMEM;
2083 nfsiod_workqueue = wq;
2084 return 0;
2085 }
2086
2087 /*
2088 * Destroy the nfsiod workqueue
2089 */
2090 static void nfsiod_stop(void)
2091 {
2092 struct workqueue_struct *wq;
2093
2094 wq = nfsiod_workqueue;
2095 if (wq == NULL)
2096 return;
2097 nfsiod_workqueue = NULL;
2098 destroy_workqueue(wq);
2099 }
2100
2101 unsigned int nfs_net_id;
2102 EXPORT_SYMBOL_GPL(nfs_net_id);
2103
2104 static int nfs_net_init(struct net *net)
2105 {
2106 nfs_clients_init(net);
2107 return nfs_fs_proc_net_init(net);
2108 }
2109
2110 static void nfs_net_exit(struct net *net)
2111 {
2112 struct nfs_net *nn = net_generic(net, nfs_net_id);
2113
2114 nfs_fs_proc_net_exit(net);
2115 nfs_cleanup_cb_ident_idr(net);
2116 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2117 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
2118 }
2119
2120 static struct pernet_operations nfs_net_ops = {
2121 .init = nfs_net_init,
2122 .exit = nfs_net_exit,
2123 .id = &nfs_net_id,
2124 .size = sizeof(struct nfs_net),
2125 };
2126
2127 /*
2128 * Initialize NFS
2129 */
2130 static int __init init_nfs_fs(void)
2131 {
2132 int err;
2133
2134 err = register_pernet_subsys(&nfs_net_ops);
2135 if (err < 0)
2136 goto out9;
2137
2138 err = nfs_fscache_register();
2139 if (err < 0)
2140 goto out8;
2141
2142 err = nfsiod_start();
2143 if (err)
2144 goto out7;
2145
2146 err = nfs_fs_proc_init();
2147 if (err)
2148 goto out6;
2149
2150 err = nfs_init_nfspagecache();
2151 if (err)
2152 goto out5;
2153
2154 err = nfs_init_inodecache();
2155 if (err)
2156 goto out4;
2157
2158 err = nfs_init_readpagecache();
2159 if (err)
2160 goto out3;
2161
2162 err = nfs_init_writepagecache();
2163 if (err)
2164 goto out2;
2165
2166 err = nfs_init_directcache();
2167 if (err)
2168 goto out1;
2169
2170 rpc_proc_register(&init_net, &nfs_rpcstat);
2171
2172 err = register_nfs_fs();
2173 if (err)
2174 goto out0;
2175
2176 return 0;
2177 out0:
2178 rpc_proc_unregister(&init_net, "nfs");
2179 nfs_destroy_directcache();
2180 out1:
2181 nfs_destroy_writepagecache();
2182 out2:
2183 nfs_destroy_readpagecache();
2184 out3:
2185 nfs_destroy_inodecache();
2186 out4:
2187 nfs_destroy_nfspagecache();
2188 out5:
2189 nfs_fs_proc_exit();
2190 out6:
2191 nfsiod_stop();
2192 out7:
2193 nfs_fscache_unregister();
2194 out8:
2195 unregister_pernet_subsys(&nfs_net_ops);
2196 out9:
2197 return err;
2198 }
2199
2200 static void __exit exit_nfs_fs(void)
2201 {
2202 nfs_destroy_directcache();
2203 nfs_destroy_writepagecache();
2204 nfs_destroy_readpagecache();
2205 nfs_destroy_inodecache();
2206 nfs_destroy_nfspagecache();
2207 nfs_fscache_unregister();
2208 unregister_pernet_subsys(&nfs_net_ops);
2209 rpc_proc_unregister(&init_net, "nfs");
2210 unregister_nfs_fs();
2211 nfs_fs_proc_exit();
2212 nfsiod_stop();
2213 }
2214
2215 /* Not quite true; I just maintain it */
2216 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2217 MODULE_LICENSE("GPL");
2218 module_param(enable_ino64, bool, 0644);
2219
2220 module_init(init_nfs_fs)
2221 module_exit(exit_nfs_fs)
CRIS linux kernel tree