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IB/uverbs: Fix device cleanup
[linux/fpc-iii.git] / fs / nfs / inode.c
blob109279d6d91bd61421ef572bbcaa1dfe9fa0e9c8
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
42 #include <linux/uaccess.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)
89 {
90 return nfs_wait_killable(TASK_KILLABLE);
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->i_version = 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->i_version = 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 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
739 int err = 0;
740
741 trace_nfs_getattr_enter(inode);
742 /* Flush out writes to the server in order to update c/mtime. */
743 if (S_ISREG(inode->i_mode)) {
744 err = filemap_write_and_wait(inode->i_mapping);
745 if (err)
746 goto out;
747 }
748
749 /*
750 * We may force a getattr if the user cares about atime.
751 *
752 * Note that we only have to check the vfsmount flags here:
753 * - NFS always sets S_NOATIME by so checking it would give a
754 * bogus result
755 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
756 * no point in checking those.
757 */
758 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
759 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
760 need_atime = 0;
761
762 if (need_atime || nfs_need_revalidate_inode(inode)) {
763 struct nfs_server *server = NFS_SERVER(inode);
764
765 if (!(server->flags & NFS_MOUNT_NOAC))
766 nfs_readdirplus_parent_cache_miss(path->dentry);
767 else
768 nfs_readdirplus_parent_cache_hit(path->dentry);
769 err = __nfs_revalidate_inode(server, inode);
770 } else
771 nfs_readdirplus_parent_cache_hit(path->dentry);
772 if (!err) {
773 generic_fillattr(inode, stat);
774 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
775 if (S_ISDIR(inode->i_mode))
776 stat->blksize = NFS_SERVER(inode)->dtsize;
777 }
778 out:
779 trace_nfs_getattr_exit(inode, err);
780 return err;
781 }
782 EXPORT_SYMBOL_GPL(nfs_getattr);
783
784 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
785 {
786 atomic_set(&l_ctx->count, 1);
787 l_ctx->lockowner = current->files;
788 INIT_LIST_HEAD(&l_ctx->list);
789 atomic_set(&l_ctx->io_count, 0);
790 }
791
792 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
793 {
794 struct nfs_lock_context *head = &ctx->lock_context;
795 struct nfs_lock_context *pos = head;
796
797 do {
798 if (pos->lockowner != current->files)
799 continue;
800 atomic_inc(&pos->count);
801 return pos;
802 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
803 return NULL;
804 }
805
806 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
807 {
808 struct nfs_lock_context *res, *new = NULL;
809 struct inode *inode = d_inode(ctx->dentry);
810
811 spin_lock(&inode->i_lock);
812 res = __nfs_find_lock_context(ctx);
813 if (res == NULL) {
814 spin_unlock(&inode->i_lock);
815 new = kmalloc(sizeof(*new), GFP_KERNEL);
816 if (new == NULL)
817 return ERR_PTR(-ENOMEM);
818 nfs_init_lock_context(new);
819 spin_lock(&inode->i_lock);
820 res = __nfs_find_lock_context(ctx);
821 if (res == NULL) {
822 list_add_tail(&new->list, &ctx->lock_context.list);
823 new->open_context = ctx;
824 res = new;
825 new = NULL;
826 }
827 }
828 spin_unlock(&inode->i_lock);
829 kfree(new);
830 return res;
831 }
832 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
833
834 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
835 {
836 struct nfs_open_context *ctx = l_ctx->open_context;
837 struct inode *inode = d_inode(ctx->dentry);
838
839 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
840 return;
841 list_del(&l_ctx->list);
842 spin_unlock(&inode->i_lock);
843 kfree(l_ctx);
844 }
845 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
846
847 /**
848 * nfs_close_context - Common close_context() routine NFSv2/v3
849 * @ctx: pointer to context
850 * @is_sync: is this a synchronous close
851 *
852 * Ensure that the attributes are up to date if we're mounted
853 * with close-to-open semantics and we have cached data that will
854 * need to be revalidated on open.
855 */
856 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
857 {
858 struct nfs_inode *nfsi;
859 struct inode *inode;
860 struct nfs_server *server;
861
862 if (!(ctx->mode & FMODE_WRITE))
863 return;
864 if (!is_sync)
865 return;
866 inode = d_inode(ctx->dentry);
867 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
868 return;
869 nfsi = NFS_I(inode);
870 if (inode->i_mapping->nrpages == 0)
871 return;
872 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
873 return;
874 if (!list_empty(&nfsi->open_files))
875 return;
876 server = NFS_SERVER(inode);
877 if (server->flags & NFS_MOUNT_NOCTO)
878 return;
879 nfs_revalidate_inode(server, inode);
880 }
881 EXPORT_SYMBOL_GPL(nfs_close_context);
882
883 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
884 fmode_t f_mode,
885 struct file *filp)
886 {
887 struct nfs_open_context *ctx;
888 struct rpc_cred *cred = rpc_lookup_cred();
889 if (IS_ERR(cred))
890 return ERR_CAST(cred);
891
892 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
893 if (!ctx) {
894 put_rpccred(cred);
895 return ERR_PTR(-ENOMEM);
896 }
897 nfs_sb_active(dentry->d_sb);
898 ctx->dentry = dget(dentry);
899 ctx->cred = cred;
900 ctx->state = NULL;
901 ctx->mode = f_mode;
902 ctx->flags = 0;
903 ctx->error = 0;
904 ctx->flock_owner = (fl_owner_t)filp;
905 nfs_init_lock_context(&ctx->lock_context);
906 ctx->lock_context.open_context = ctx;
907 INIT_LIST_HEAD(&ctx->list);
908 ctx->mdsthreshold = NULL;
909 return ctx;
910 }
911 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
912
913 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
914 {
915 if (ctx != NULL)
916 atomic_inc(&ctx->lock_context.count);
917 return ctx;
918 }
919 EXPORT_SYMBOL_GPL(get_nfs_open_context);
920
921 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
922 {
923 struct inode *inode = d_inode(ctx->dentry);
924 struct super_block *sb = ctx->dentry->d_sb;
925
926 if (!list_empty(&ctx->list)) {
927 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
928 return;
929 list_del(&ctx->list);
930 spin_unlock(&inode->i_lock);
931 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
932 return;
933 if (inode != NULL)
934 NFS_PROTO(inode)->close_context(ctx, is_sync);
935 if (ctx->cred != NULL)
936 put_rpccred(ctx->cred);
937 dput(ctx->dentry);
938 nfs_sb_deactive(sb);
939 kfree(ctx->mdsthreshold);
940 kfree(ctx);
941 }
942
943 void put_nfs_open_context(struct nfs_open_context *ctx)
944 {
945 __put_nfs_open_context(ctx, 0);
946 }
947 EXPORT_SYMBOL_GPL(put_nfs_open_context);
948
949 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
950 {
951 __put_nfs_open_context(ctx, 1);
952 }
953
954 /*
955 * Ensure that mmap has a recent RPC credential for use when writing out
956 * shared pages
957 */
958 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
959 {
960 struct inode *inode = d_inode(ctx->dentry);
961 struct nfs_inode *nfsi = NFS_I(inode);
962
963 spin_lock(&inode->i_lock);
964 if (ctx->mode & FMODE_WRITE)
965 list_add(&ctx->list, &nfsi->open_files);
966 else
967 list_add_tail(&ctx->list, &nfsi->open_files);
968 spin_unlock(&inode->i_lock);
969 }
970 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
971
972 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
973 {
974 filp->private_data = get_nfs_open_context(ctx);
975 if (list_empty(&ctx->list))
976 nfs_inode_attach_open_context(ctx);
977 }
978 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
979
980 /*
981 * Given an inode, search for an open context with the desired characteristics
982 */
983 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
984 {
985 struct nfs_inode *nfsi = NFS_I(inode);
986 struct nfs_open_context *pos, *ctx = NULL;
987
988 spin_lock(&inode->i_lock);
989 list_for_each_entry(pos, &nfsi->open_files, list) {
990 if (cred != NULL && pos->cred != cred)
991 continue;
992 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
993 continue;
994 ctx = get_nfs_open_context(pos);
995 break;
996 }
997 spin_unlock(&inode->i_lock);
998 return ctx;
999 }
1000
1001 void nfs_file_clear_open_context(struct file *filp)
1002 {
1003 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1004
1005 if (ctx) {
1006 struct inode *inode = d_inode(ctx->dentry);
1007
1008 /*
1009 * We fatal error on write before. Try to writeback
1010 * every page again.
1011 */
1012 if (ctx->error < 0)
1013 invalidate_inode_pages2(inode->i_mapping);
1014 filp->private_data = NULL;
1015 spin_lock(&inode->i_lock);
1016 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1017 spin_unlock(&inode->i_lock);
1018 put_nfs_open_context_sync(ctx);
1019 }
1020 }
1021
1022 /*
1023 * These allocate and release file read/write context information.
1024 */
1025 int nfs_open(struct inode *inode, struct file *filp)
1026 {
1027 struct nfs_open_context *ctx;
1028
1029 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1030 if (IS_ERR(ctx))
1031 return PTR_ERR(ctx);
1032 nfs_file_set_open_context(filp, ctx);
1033 put_nfs_open_context(ctx);
1034 nfs_fscache_open_file(inode, filp);
1035 return 0;
1036 }
1037
1038 /*
1039 * This function is called whenever some part of NFS notices that
1040 * the cached attributes have to be refreshed.
1041 */
1042 int
1043 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1044 {
1045 int status = -ESTALE;
1046 struct nfs4_label *label = NULL;
1047 struct nfs_fattr *fattr = NULL;
1048 struct nfs_inode *nfsi = NFS_I(inode);
1049
1050 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1051 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1052
1053 trace_nfs_revalidate_inode_enter(inode);
1054
1055 if (is_bad_inode(inode))
1056 goto out;
1057 if (NFS_STALE(inode))
1058 goto out;
1059
1060 /* pNFS: Attributes aren't updated until we layoutcommit */
1061 if (S_ISREG(inode->i_mode)) {
1062 status = pnfs_sync_inode(inode, false);
1063 if (status)
1064 goto out;
1065 }
1066
1067 status = -ENOMEM;
1068 fattr = nfs_alloc_fattr();
1069 if (fattr == NULL)
1070 goto out;
1071
1072 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1073
1074 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1075 if (IS_ERR(label)) {
1076 status = PTR_ERR(label);
1077 goto out;
1078 }
1079
1080 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1081 if (status != 0) {
1082 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1083 inode->i_sb->s_id,
1084 (unsigned long long)NFS_FILEID(inode), status);
1085 if (status == -ESTALE) {
1086 nfs_zap_caches(inode);
1087 if (!S_ISDIR(inode->i_mode))
1088 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1089 }
1090 goto err_out;
1091 }
1092
1093 status = nfs_refresh_inode(inode, fattr);
1094 if (status) {
1095 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1096 inode->i_sb->s_id,
1097 (unsigned long long)NFS_FILEID(inode), status);
1098 goto err_out;
1099 }
1100
1101 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1102 nfs_zap_acl_cache(inode);
1103
1104 nfs_setsecurity(inode, fattr, label);
1105
1106 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1107 inode->i_sb->s_id,
1108 (unsigned long long)NFS_FILEID(inode));
1109
1110 err_out:
1111 nfs4_label_free(label);
1112 out:
1113 nfs_free_fattr(fattr);
1114 trace_nfs_revalidate_inode_exit(inode, status);
1115 return status;
1116 }
1117
1118 int nfs_attribute_cache_expired(struct inode *inode)
1119 {
1120 if (nfs_have_delegated_attributes(inode))
1121 return 0;
1122 return nfs_attribute_timeout(inode);
1123 }
1124
1125 /**
1126 * nfs_revalidate_inode - Revalidate the inode attributes
1127 * @server - pointer to nfs_server struct
1128 * @inode - pointer to inode struct
1129 *
1130 * Updates inode attribute information by retrieving the data from the server.
1131 */
1132 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1133 {
1134 if (!nfs_need_revalidate_inode(inode))
1135 return NFS_STALE(inode) ? -ESTALE : 0;
1136 return __nfs_revalidate_inode(server, inode);
1137 }
1138 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1139
1140 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1141 {
1142 struct nfs_inode *nfsi = NFS_I(inode);
1143 int ret;
1144
1145 if (mapping->nrpages != 0) {
1146 if (S_ISREG(inode->i_mode)) {
1147 unmap_mapping_range(mapping, 0, 0, 0);
1148 ret = nfs_sync_mapping(mapping);
1149 if (ret < 0)
1150 return ret;
1151 }
1152 ret = invalidate_inode_pages2(mapping);
1153 if (ret < 0)
1154 return ret;
1155 }
1156 if (S_ISDIR(inode->i_mode)) {
1157 spin_lock(&inode->i_lock);
1158 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1159 spin_unlock(&inode->i_lock);
1160 }
1161 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1162 nfs_fscache_wait_on_invalidate(inode);
1163
1164 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1165 inode->i_sb->s_id,
1166 (unsigned long long)NFS_FILEID(inode));
1167 return 0;
1168 }
1169
1170 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1171 {
1172 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1173 NFS_STALE(inode);
1174 }
1175
1176 int nfs_revalidate_mapping_rcu(struct inode *inode)
1177 {
1178 struct nfs_inode *nfsi = NFS_I(inode);
1179 unsigned long *bitlock = &nfsi->flags;
1180 int ret = 0;
1181
1182 if (IS_SWAPFILE(inode))
1183 goto out;
1184 if (nfs_mapping_need_revalidate_inode(inode)) {
1185 ret = -ECHILD;
1186 goto out;
1187 }
1188 spin_lock(&inode->i_lock);
1189 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1190 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1191 ret = -ECHILD;
1192 spin_unlock(&inode->i_lock);
1193 out:
1194 return ret;
1195 }
1196
1197 /**
1198 * nfs_revalidate_mapping - Revalidate the pagecache
1199 * @inode - pointer to host inode
1200 * @mapping - pointer to mapping
1201 */
1202 int nfs_revalidate_mapping(struct inode *inode,
1203 struct address_space *mapping)
1204 {
1205 struct nfs_inode *nfsi = NFS_I(inode);
1206 unsigned long *bitlock = &nfsi->flags;
1207 int ret = 0;
1208
1209 /* swapfiles are not supposed to be shared. */
1210 if (IS_SWAPFILE(inode))
1211 goto out;
1212
1213 if (nfs_mapping_need_revalidate_inode(inode)) {
1214 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1215 if (ret < 0)
1216 goto out;
1217 }
1218
1219 /*
1220 * We must clear NFS_INO_INVALID_DATA first to ensure that
1221 * invalidations that come in while we're shooting down the mappings
1222 * are respected. But, that leaves a race window where one revalidator
1223 * can clear the flag, and then another checks it before the mapping
1224 * gets invalidated. Fix that by serializing access to this part of
1225 * the function.
1226 *
1227 * At the same time, we need to allow other tasks to see whether we
1228 * might be in the middle of invalidating the pages, so we only set
1229 * the bit lock here if it looks like we're going to be doing that.
1230 */
1231 for (;;) {
1232 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1233 nfs_wait_bit_killable, TASK_KILLABLE);
1234 if (ret)
1235 goto out;
1236 spin_lock(&inode->i_lock);
1237 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1238 spin_unlock(&inode->i_lock);
1239 continue;
1240 }
1241 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1242 break;
1243 spin_unlock(&inode->i_lock);
1244 goto out;
1245 }
1246
1247 set_bit(NFS_INO_INVALIDATING, bitlock);
1248 smp_wmb();
1249 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1250 spin_unlock(&inode->i_lock);
1251 trace_nfs_invalidate_mapping_enter(inode);
1252 ret = nfs_invalidate_mapping(inode, mapping);
1253 trace_nfs_invalidate_mapping_exit(inode, ret);
1254
1255 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1256 smp_mb__after_atomic();
1257 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1258 out:
1259 return ret;
1260 }
1261
1262 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1263 {
1264 struct inode *inode = &nfsi->vfs_inode;
1265
1266 assert_spin_locked(&inode->i_lock);
1267
1268 if (!S_ISREG(inode->i_mode))
1269 return false;
1270 if (list_empty(&nfsi->open_files))
1271 return false;
1272 /* Note: This relies on nfsi->open_files being ordered with writers
1273 * being placed at the head of the list.
1274 * See nfs_inode_attach_open_context()
1275 */
1276 return (list_first_entry(&nfsi->open_files,
1277 struct nfs_open_context,
1278 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1279 }
1280
1281 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1282 {
1283 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1284 }
1285
1286 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1287 {
1288 struct nfs_inode *nfsi = NFS_I(inode);
1289 unsigned long ret = 0;
1290
1291 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1292 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1293 && inode->i_version == fattr->pre_change_attr) {
1294 inode->i_version = fattr->change_attr;
1295 if (S_ISDIR(inode->i_mode))
1296 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1297 ret |= NFS_INO_INVALID_ATTR;
1298 }
1299 /* If we have atomic WCC data, we may update some attributes */
1300 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1301 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1302 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1303 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1304 ret |= NFS_INO_INVALID_ATTR;
1305 }
1306
1307 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1308 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1309 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1310 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1311 if (S_ISDIR(inode->i_mode))
1312 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1313 ret |= NFS_INO_INVALID_ATTR;
1314 }
1315 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1316 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1317 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1318 && nfsi->nrequests == 0) {
1319 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1320 ret |= NFS_INO_INVALID_ATTR;
1321 }
1322
1323 return ret;
1324 }
1325
1326 /**
1327 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1328 * @inode - pointer to inode
1329 * @fattr - updated attributes
1330 *
1331 * Verifies the attribute cache. If we have just changed the attributes,
1332 * so that fattr carries weak cache consistency data, then it may
1333 * also update the ctime/mtime/change_attribute.
1334 */
1335 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1336 {
1337 struct nfs_inode *nfsi = NFS_I(inode);
1338 loff_t cur_size, new_isize;
1339 unsigned long invalid = 0;
1340
1341
1342 if (nfs_have_delegated_attributes(inode))
1343 return 0;
1344 /* Has the inode gone and changed behind our back? */
1345 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1346 return -ESTALE;
1347 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1348 return -ESTALE;
1349
1350 if (!nfs_file_has_buffered_writers(nfsi)) {
1351 /* Verify a few of the more important attributes */
1352 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
1353 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1354
1355 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1356 invalid |= NFS_INO_INVALID_ATTR;
1357
1358 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1359 invalid |= NFS_INO_INVALID_ATTR;
1360
1361 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1362 cur_size = i_size_read(inode);
1363 new_isize = nfs_size_to_loff_t(fattr->size);
1364 if (cur_size != new_isize)
1365 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1366 }
1367 }
1368
1369 /* Have any file permissions changed? */
1370 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1371 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1372 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1373 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1374 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1375 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1376
1377 /* Has the link count changed? */
1378 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1379 invalid |= NFS_INO_INVALID_ATTR;
1380
1381 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1382 invalid |= NFS_INO_INVALID_ATIME;
1383
1384 if (invalid != 0)
1385 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1386
1387 nfsi->read_cache_jiffies = fattr->time_start;
1388 return 0;
1389 }
1390
1391 static atomic_long_t nfs_attr_generation_counter;
1392
1393 static unsigned long nfs_read_attr_generation_counter(void)
1394 {
1395 return atomic_long_read(&nfs_attr_generation_counter);
1396 }
1397
1398 unsigned long nfs_inc_attr_generation_counter(void)
1399 {
1400 return atomic_long_inc_return(&nfs_attr_generation_counter);
1401 }
1402 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1403
1404 void nfs_fattr_init(struct nfs_fattr *fattr)
1405 {
1406 fattr->valid = 0;
1407 fattr->time_start = jiffies;
1408 fattr->gencount = nfs_inc_attr_generation_counter();
1409 fattr->owner_name = NULL;
1410 fattr->group_name = NULL;
1411 }
1412 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1413
1414 /**
1415 * nfs_fattr_set_barrier
1416 * @fattr: attributes
1417 *
1418 * Used to set a barrier after an attribute was updated. This
1419 * barrier ensures that older attributes from RPC calls that may
1420 * have raced with our update cannot clobber these new values.
1421 * Note that you are still responsible for ensuring that other
1422 * operations which change the attribute on the server do not
1423 * collide.
1424 */
1425 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1426 {
1427 fattr->gencount = nfs_inc_attr_generation_counter();
1428 }
1429
1430 struct nfs_fattr *nfs_alloc_fattr(void)
1431 {
1432 struct nfs_fattr *fattr;
1433
1434 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1435 if (fattr != NULL)
1436 nfs_fattr_init(fattr);
1437 return fattr;
1438 }
1439 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1440
1441 struct nfs_fh *nfs_alloc_fhandle(void)
1442 {
1443 struct nfs_fh *fh;
1444
1445 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1446 if (fh != NULL)
1447 fh->size = 0;
1448 return fh;
1449 }
1450 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1451
1452 #ifdef NFS_DEBUG
1453 /*
1454 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1455 * in the same way that wireshark does
1456 *
1457 * @fh: file handle
1458 *
1459 * For debugging only.
1460 */
1461 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1462 {
1463 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1464 * not on the result */
1465 return nfs_fhandle_hash(fh);
1466 }
1467 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1468
1469 /*
1470 * _nfs_display_fhandle - display an NFS file handle on the console
1471 *
1472 * @fh: file handle to display
1473 * @caption: display caption
1474 *
1475 * For debugging only.
1476 */
1477 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1478 {
1479 unsigned short i;
1480
1481 if (fh == NULL || fh->size == 0) {
1482 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1483 return;
1484 }
1485
1486 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1487 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1488 for (i = 0; i < fh->size; i += 16) {
1489 __be32 *pos = (__be32 *)&fh->data[i];
1490
1491 switch ((fh->size - i - 1) >> 2) {
1492 case 0:
1493 printk(KERN_DEFAULT " %08x\n",
1494 be32_to_cpup(pos));
1495 break;
1496 case 1:
1497 printk(KERN_DEFAULT " %08x %08x\n",
1498 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1499 break;
1500 case 2:
1501 printk(KERN_DEFAULT " %08x %08x %08x\n",
1502 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1503 be32_to_cpup(pos + 2));
1504 break;
1505 default:
1506 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1507 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1508 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1509 }
1510 }
1511 }
1512 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1513 #endif
1514
1515 /**
1516 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1517 * @inode - pointer to inode
1518 * @fattr - attributes
1519 *
1520 * Attempt to divine whether or not an RPC call reply carrying stale
1521 * attributes got scheduled after another call carrying updated ones.
1522 *
1523 * To do so, the function first assumes that a more recent ctime means
1524 * that the attributes in fattr are newer, however it also attempt to
1525 * catch the case where ctime either didn't change, or went backwards
1526 * (if someone reset the clock on the server) by looking at whether
1527 * or not this RPC call was started after the inode was last updated.
1528 * Note also the check for wraparound of 'attr_gencount'
1529 *
1530 * The function returns 'true' if it thinks the attributes in 'fattr' are
1531 * more recent than the ones cached in the inode.
1532 *
1533 */
1534 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1535 {
1536 const struct nfs_inode *nfsi = NFS_I(inode);
1537
1538 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1539 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1540 }
1541
1542 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1543 {
1544 int ret;
1545
1546 trace_nfs_refresh_inode_enter(inode);
1547
1548 if (nfs_inode_attrs_need_update(inode, fattr))
1549 ret = nfs_update_inode(inode, fattr);
1550 else
1551 ret = nfs_check_inode_attributes(inode, fattr);
1552
1553 trace_nfs_refresh_inode_exit(inode, ret);
1554 return ret;
1555 }
1556
1557 /**
1558 * nfs_refresh_inode - try to update the inode attribute cache
1559 * @inode - pointer to inode
1560 * @fattr - updated attributes
1561 *
1562 * Check that an RPC call that returned attributes has not overlapped with
1563 * other recent updates of the inode metadata, then decide whether it is
1564 * safe to do a full update of the inode attributes, or whether just to
1565 * call nfs_check_inode_attributes.
1566 */
1567 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1568 {
1569 int status;
1570
1571 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1572 return 0;
1573 spin_lock(&inode->i_lock);
1574 status = nfs_refresh_inode_locked(inode, fattr);
1575 spin_unlock(&inode->i_lock);
1576
1577 return status;
1578 }
1579 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1580
1581 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1582 {
1583 unsigned long invalid = NFS_INO_INVALID_ATTR;
1584
1585 if (S_ISDIR(inode->i_mode))
1586 invalid |= NFS_INO_INVALID_DATA;
1587 nfs_set_cache_invalid(inode, invalid);
1588 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1589 return 0;
1590 return nfs_refresh_inode_locked(inode, fattr);
1591 }
1592
1593 /**
1594 * nfs_post_op_update_inode - try to update the inode attribute cache
1595 * @inode - pointer to inode
1596 * @fattr - updated attributes
1597 *
1598 * After an operation that has changed the inode metadata, mark the
1599 * attribute cache as being invalid, then try to update it.
1600 *
1601 * NB: if the server didn't return any post op attributes, this
1602 * function will force the retrieval of attributes before the next
1603 * NFS request. Thus it should be used only for operations that
1604 * are expected to change one or more attributes, to avoid
1605 * unnecessary NFS requests and trips through nfs_update_inode().
1606 */
1607 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1608 {
1609 int status;
1610
1611 spin_lock(&inode->i_lock);
1612 nfs_fattr_set_barrier(fattr);
1613 status = nfs_post_op_update_inode_locked(inode, fattr);
1614 spin_unlock(&inode->i_lock);
1615
1616 return status;
1617 }
1618 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1619
1620 /**
1621 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1622 * @inode - pointer to inode
1623 * @fattr - updated attributes
1624 *
1625 * After an operation that has changed the inode metadata, mark the
1626 * attribute cache as being invalid, then try to update it. Fake up
1627 * weak cache consistency data, if none exist.
1628 *
1629 * This function is mainly designed to be used by the ->write_done() functions.
1630 */
1631 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1632 {
1633 int status;
1634
1635 /* Don't do a WCC update if these attributes are already stale */
1636 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1637 !nfs_inode_attrs_need_update(inode, fattr)) {
1638 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1639 | NFS_ATTR_FATTR_PRESIZE
1640 | NFS_ATTR_FATTR_PREMTIME
1641 | NFS_ATTR_FATTR_PRECTIME);
1642 goto out_noforce;
1643 }
1644 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1645 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1646 fattr->pre_change_attr = inode->i_version;
1647 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1648 }
1649 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1650 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1651 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1652 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1653 }
1654 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1655 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1656 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1657 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1658 }
1659 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1660 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1661 fattr->pre_size = i_size_read(inode);
1662 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1663 }
1664 out_noforce:
1665 status = nfs_post_op_update_inode_locked(inode, fattr);
1666 return status;
1667 }
1668
1669 /**
1670 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1671 * @inode - pointer to inode
1672 * @fattr - updated attributes
1673 *
1674 * After an operation that has changed the inode metadata, mark the
1675 * attribute cache as being invalid, then try to update it. Fake up
1676 * weak cache consistency data, if none exist.
1677 *
1678 * This function is mainly designed to be used by the ->write_done() functions.
1679 */
1680 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1681 {
1682 int status;
1683
1684 spin_lock(&inode->i_lock);
1685 nfs_fattr_set_barrier(fattr);
1686 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1687 spin_unlock(&inode->i_lock);
1688 return status;
1689 }
1690 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1691
1692
1693 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1694 struct nfs_fattr *fattr)
1695 {
1696 bool ret1 = true, ret2 = true;
1697
1698 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1699 ret1 = (nfsi->fileid == fattr->fileid);
1700 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1701 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1702 return ret1 || ret2;
1703 }
1704
1705 /*
1706 * Many nfs protocol calls return the new file attributes after
1707 * an operation. Here we update the inode to reflect the state
1708 * of the server's inode.
1709 *
1710 * This is a bit tricky because we have to make sure all dirty pages
1711 * have been sent off to the server before calling invalidate_inode_pages.
1712 * To make sure no other process adds more write requests while we try
1713 * our best to flush them, we make them sleep during the attribute refresh.
1714 *
1715 * A very similar scenario holds for the dir cache.
1716 */
1717 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1718 {
1719 struct nfs_server *server;
1720 struct nfs_inode *nfsi = NFS_I(inode);
1721 loff_t cur_isize, new_isize;
1722 unsigned long invalid = 0;
1723 unsigned long now = jiffies;
1724 unsigned long save_cache_validity;
1725 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1726 bool cache_revalidated = true;
1727
1728 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1729 __func__, inode->i_sb->s_id, inode->i_ino,
1730 nfs_display_fhandle_hash(NFS_FH(inode)),
1731 atomic_read(&inode->i_count), fattr->valid);
1732
1733 if (!nfs_fileid_valid(nfsi, fattr)) {
1734 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1735 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1736 NFS_SERVER(inode)->nfs_client->cl_hostname,
1737 inode->i_sb->s_id, (long long)nfsi->fileid,
1738 (long long)fattr->fileid);
1739 goto out_err;
1740 }
1741
1742 /*
1743 * Make sure the inode's type hasn't changed.
1744 */
1745 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1746 /*
1747 * Big trouble! The inode has become a different object.
1748 */
1749 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1750 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1751 goto out_err;
1752 }
1753
1754 server = NFS_SERVER(inode);
1755 /* Update the fsid? */
1756 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1757 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1758 !IS_AUTOMOUNT(inode))
1759 server->fsid = fattr->fsid;
1760
1761 /*
1762 * Update the read time so we don't revalidate too often.
1763 */
1764 nfsi->read_cache_jiffies = fattr->time_start;
1765
1766 save_cache_validity = nfsi->cache_validity;
1767 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1768 | NFS_INO_INVALID_ATIME
1769 | NFS_INO_REVAL_FORCED
1770 | NFS_INO_REVAL_PAGECACHE);
1771
1772 /* Do atomic weak cache consistency updates */
1773 invalid |= nfs_wcc_update_inode(inode, fattr);
1774
1775 if (pnfs_layoutcommit_outstanding(inode)) {
1776 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1777 cache_revalidated = false;
1778 }
1779
1780 /* More cache consistency checks */
1781 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1782 if (inode->i_version != fattr->change_attr) {
1783 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1784 inode->i_sb->s_id, inode->i_ino);
1785 /* Could it be a race with writeback? */
1786 if (!have_writers) {
1787 invalid |= NFS_INO_INVALID_ATTR
1788 | NFS_INO_INVALID_DATA
1789 | NFS_INO_INVALID_ACCESS
1790 | NFS_INO_INVALID_ACL;
1791 if (S_ISDIR(inode->i_mode))
1792 nfs_force_lookup_revalidate(inode);
1793 }
1794 inode->i_version = fattr->change_attr;
1795 }
1796 } else {
1797 nfsi->cache_validity |= save_cache_validity;
1798 cache_revalidated = false;
1799 }
1800
1801 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1802 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1803 } else if (server->caps & NFS_CAP_MTIME) {
1804 nfsi->cache_validity |= save_cache_validity &
1805 (NFS_INO_INVALID_ATTR
1806 | NFS_INO_REVAL_FORCED);
1807 cache_revalidated = false;
1808 }
1809
1810 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1811 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1812 } else if (server->caps & NFS_CAP_CTIME) {
1813 nfsi->cache_validity |= save_cache_validity &
1814 (NFS_INO_INVALID_ATTR
1815 | NFS_INO_REVAL_FORCED);
1816 cache_revalidated = false;
1817 }
1818
1819 /* Check if our cached file size is stale */
1820 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1821 new_isize = nfs_size_to_loff_t(fattr->size);
1822 cur_isize = i_size_read(inode);
1823 if (new_isize != cur_isize) {
1824 /* Do we perhaps have any outstanding writes, or has
1825 * the file grown beyond our last write? */
1826 if (nfsi->nrequests == 0 || new_isize > cur_isize) {
1827 i_size_write(inode, new_isize);
1828 if (!have_writers)
1829 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1830 }
1831 dprintk("NFS: isize change on server for file %s/%ld "
1832 "(%Ld to %Ld)\n",
1833 inode->i_sb->s_id,
1834 inode->i_ino,
1835 (long long)cur_isize,
1836 (long long)new_isize);
1837 }
1838 } else {
1839 nfsi->cache_validity |= save_cache_validity &
1840 (NFS_INO_INVALID_ATTR
1841 | NFS_INO_REVAL_PAGECACHE
1842 | NFS_INO_REVAL_FORCED);
1843 cache_revalidated = false;
1844 }
1845
1846
1847 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1848 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1849 else if (server->caps & NFS_CAP_ATIME) {
1850 nfsi->cache_validity |= save_cache_validity &
1851 (NFS_INO_INVALID_ATIME
1852 | NFS_INO_REVAL_FORCED);
1853 cache_revalidated = false;
1854 }
1855
1856 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1857 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1858 umode_t newmode = inode->i_mode & S_IFMT;
1859 newmode |= fattr->mode & S_IALLUGO;
1860 inode->i_mode = newmode;
1861 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1862 }
1863 } else if (server->caps & NFS_CAP_MODE) {
1864 nfsi->cache_validity |= save_cache_validity &
1865 (NFS_INO_INVALID_ATTR
1866 | NFS_INO_INVALID_ACCESS
1867 | NFS_INO_INVALID_ACL
1868 | NFS_INO_REVAL_FORCED);
1869 cache_revalidated = false;
1870 }
1871
1872 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1873 if (!uid_eq(inode->i_uid, fattr->uid)) {
1874 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1875 inode->i_uid = fattr->uid;
1876 }
1877 } else if (server->caps & NFS_CAP_OWNER) {
1878 nfsi->cache_validity |= save_cache_validity &
1879 (NFS_INO_INVALID_ATTR
1880 | NFS_INO_INVALID_ACCESS
1881 | NFS_INO_INVALID_ACL
1882 | NFS_INO_REVAL_FORCED);
1883 cache_revalidated = false;
1884 }
1885
1886 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1887 if (!gid_eq(inode->i_gid, fattr->gid)) {
1888 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1889 inode->i_gid = fattr->gid;
1890 }
1891 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1892 nfsi->cache_validity |= save_cache_validity &
1893 (NFS_INO_INVALID_ATTR
1894 | NFS_INO_INVALID_ACCESS
1895 | NFS_INO_INVALID_ACL
1896 | NFS_INO_REVAL_FORCED);
1897 cache_revalidated = false;
1898 }
1899
1900 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1901 if (inode->i_nlink != fattr->nlink) {
1902 invalid |= NFS_INO_INVALID_ATTR;
1903 if (S_ISDIR(inode->i_mode))
1904 invalid |= NFS_INO_INVALID_DATA;
1905 set_nlink(inode, fattr->nlink);
1906 }
1907 } else if (server->caps & NFS_CAP_NLINK) {
1908 nfsi->cache_validity |= save_cache_validity &
1909 (NFS_INO_INVALID_ATTR
1910 | NFS_INO_REVAL_FORCED);
1911 cache_revalidated = false;
1912 }
1913
1914 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1915 /*
1916 * report the blocks in 512byte units
1917 */
1918 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1919 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1920 inode->i_blocks = fattr->du.nfs2.blocks;
1921 else
1922 cache_revalidated = false;
1923
1924 /* Update attrtimeo value if we're out of the unstable period */
1925 if (invalid & NFS_INO_INVALID_ATTR) {
1926 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1927 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1928 nfsi->attrtimeo_timestamp = now;
1929 /* Set barrier to be more recent than all outstanding updates */
1930 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1931 } else {
1932 if (cache_revalidated) {
1933 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1934 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1935 nfsi->attrtimeo <<= 1;
1936 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1937 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1938 }
1939 nfsi->attrtimeo_timestamp = now;
1940 }
1941 /* Set the barrier to be more recent than this fattr */
1942 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1943 nfsi->attr_gencount = fattr->gencount;
1944 }
1945
1946 /* Don't declare attrcache up to date if there were no attrs! */
1947 if (cache_revalidated)
1948 invalid &= ~NFS_INO_INVALID_ATTR;
1949
1950 /* Don't invalidate the data if we were to blame */
1951 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1952 || S_ISLNK(inode->i_mode)))
1953 invalid &= ~NFS_INO_INVALID_DATA;
1954 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1955 (save_cache_validity & NFS_INO_REVAL_FORCED))
1956 nfs_set_cache_invalid(inode, invalid);
1957
1958 return 0;
1959 out_err:
1960 /*
1961 * No need to worry about unhashing the dentry, as the
1962 * lookup validation will know that the inode is bad.
1963 * (But we fall through to invalidate the caches.)
1964 */
1965 nfs_invalidate_inode(inode);
1966 return -ESTALE;
1967 }
1968
1969 struct inode *nfs_alloc_inode(struct super_block *sb)
1970 {
1971 struct nfs_inode *nfsi;
1972 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1973 if (!nfsi)
1974 return NULL;
1975 nfsi->flags = 0UL;
1976 nfsi->cache_validity = 0UL;
1977 #if IS_ENABLED(CONFIG_NFS_V4)
1978 nfsi->nfs4_acl = NULL;
1979 #endif /* CONFIG_NFS_V4 */
1980 return &nfsi->vfs_inode;
1981 }
1982 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1983
1984 static void nfs_i_callback(struct rcu_head *head)
1985 {
1986 struct inode *inode = container_of(head, struct inode, i_rcu);
1987 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1988 }
1989
1990 void nfs_destroy_inode(struct inode *inode)
1991 {
1992 call_rcu(&inode->i_rcu, nfs_i_callback);
1993 }
1994 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1995
1996 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1997 {
1998 #if IS_ENABLED(CONFIG_NFS_V4)
1999 INIT_LIST_HEAD(&nfsi->open_states);
2000 nfsi->delegation = NULL;
2001 init_rwsem(&nfsi->rwsem);
2002 nfsi->layout = NULL;
2003 #endif
2004 }
2005
2006 static void init_once(void *foo)
2007 {
2008 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2009
2010 inode_init_once(&nfsi->vfs_inode);
2011 INIT_LIST_HEAD(&nfsi->open_files);
2012 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2013 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2014 INIT_LIST_HEAD(&nfsi->commit_info.list);
2015 nfsi->nrequests = 0;
2016 nfsi->commit_info.ncommit = 0;
2017 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2018 init_rwsem(&nfsi->rmdir_sem);
2019 nfs4_init_once(nfsi);
2020 }
2021
2022 static int __init nfs_init_inodecache(void)
2023 {
2024 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2025 sizeof(struct nfs_inode),
2026 0, (SLAB_RECLAIM_ACCOUNT|
2027 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2028 init_once);
2029 if (nfs_inode_cachep == NULL)
2030 return -ENOMEM;
2031
2032 return 0;
2033 }
2034
2035 static void nfs_destroy_inodecache(void)
2036 {
2037 /*
2038 * Make sure all delayed rcu free inodes are flushed before we
2039 * destroy cache.
2040 */
2041 rcu_barrier();
2042 kmem_cache_destroy(nfs_inode_cachep);
2043 }
2044
2045 struct workqueue_struct *nfsiod_workqueue;
2046 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2047
2048 /*
2049 * start up the nfsiod workqueue
2050 */
2051 static int nfsiod_start(void)
2052 {
2053 struct workqueue_struct *wq;
2054 dprintk("RPC: creating workqueue nfsiod\n");
2055 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2056 if (wq == NULL)
2057 return -ENOMEM;
2058 nfsiod_workqueue = wq;
2059 return 0;
2060 }
2061
2062 /*
2063 * Destroy the nfsiod workqueue
2064 */
2065 static void nfsiod_stop(void)
2066 {
2067 struct workqueue_struct *wq;
2068
2069 wq = nfsiod_workqueue;
2070 if (wq == NULL)
2071 return;
2072 nfsiod_workqueue = NULL;
2073 destroy_workqueue(wq);
2074 }
2075
2076 unsigned int nfs_net_id;
2077 EXPORT_SYMBOL_GPL(nfs_net_id);
2078
2079 static int nfs_net_init(struct net *net)
2080 {
2081 nfs_clients_init(net);
2082 return nfs_fs_proc_net_init(net);
2083 }
2084
2085 static void nfs_net_exit(struct net *net)
2086 {
2087 nfs_fs_proc_net_exit(net);
2088 nfs_cleanup_cb_ident_idr(net);
2089 }
2090
2091 static struct pernet_operations nfs_net_ops = {
2092 .init = nfs_net_init,
2093 .exit = nfs_net_exit,
2094 .id = &nfs_net_id,
2095 .size = sizeof(struct nfs_net),
2096 };
2097
2098 /*
2099 * Initialize NFS
2100 */
2101 static int __init init_nfs_fs(void)
2102 {
2103 int err;
2104
2105 err = register_pernet_subsys(&nfs_net_ops);
2106 if (err < 0)
2107 goto out9;
2108
2109 err = nfs_fscache_register();
2110 if (err < 0)
2111 goto out8;
2112
2113 err = nfsiod_start();
2114 if (err)
2115 goto out7;
2116
2117 err = nfs_fs_proc_init();
2118 if (err)
2119 goto out6;
2120
2121 err = nfs_init_nfspagecache();
2122 if (err)
2123 goto out5;
2124
2125 err = nfs_init_inodecache();
2126 if (err)
2127 goto out4;
2128
2129 err = nfs_init_readpagecache();
2130 if (err)
2131 goto out3;
2132
2133 err = nfs_init_writepagecache();
2134 if (err)
2135 goto out2;
2136
2137 err = nfs_init_directcache();
2138 if (err)
2139 goto out1;
2140
2141 rpc_proc_register(&init_net, &nfs_rpcstat);
2142
2143 err = register_nfs_fs();
2144 if (err)
2145 goto out0;
2146
2147 return 0;
2148 out0:
2149 rpc_proc_unregister(&init_net, "nfs");
2150 nfs_destroy_directcache();
2151 out1:
2152 nfs_destroy_writepagecache();
2153 out2:
2154 nfs_destroy_readpagecache();
2155 out3:
2156 nfs_destroy_inodecache();
2157 out4:
2158 nfs_destroy_nfspagecache();
2159 out5:
2160 nfs_fs_proc_exit();
2161 out6:
2162 nfsiod_stop();
2163 out7:
2164 nfs_fscache_unregister();
2165 out8:
2166 unregister_pernet_subsys(&nfs_net_ops);
2167 out9:
2168 return err;
2169 }
2170
2171 static void __exit exit_nfs_fs(void)
2172 {
2173 nfs_destroy_directcache();
2174 nfs_destroy_writepagecache();
2175 nfs_destroy_readpagecache();
2176 nfs_destroy_inodecache();
2177 nfs_destroy_nfspagecache();
2178 nfs_fscache_unregister();
2179 unregister_pernet_subsys(&nfs_net_ops);
2180 rpc_proc_unregister(&init_net, "nfs");
2181 unregister_nfs_fs();
2182 nfs_fs_proc_exit();
2183 nfsiod_stop();
2184 }
2185
2186 /* Not quite true; I just maintain it */
2187 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2188 MODULE_LICENSE("GPL");
2189 module_param(enable_ino64, bool, 0644);
2190
2191 module_init(init_nfs_fs)
2192 module_exit(exit_nfs_fs)
Linux with added FPC-III support