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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / fs / nfs / inode.c
blob5ca4d96b19421881c6b3b0fba493e605d6d70eeb
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.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 /*
390 * This is our front-end to iget that looks up inodes by file handle
391 * instead of inode number.
392 */
393 struct inode *
394 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
395 {
396 struct nfs_find_desc desc = {
397 .fh = fh,
398 .fattr = fattr
399 };
400 struct inode *inode = ERR_PTR(-ENOENT);
401 unsigned long hash;
402
403 nfs_attr_check_mountpoint(sb, fattr);
404
405 if (nfs_attr_use_mounted_on_fileid(fattr))
406 fattr->fileid = fattr->mounted_on_fileid;
407 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
408 goto out_no_inode;
409 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
410 goto out_no_inode;
411
412 hash = nfs_fattr_to_ino_t(fattr);
413
414 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
415 if (inode == NULL) {
416 inode = ERR_PTR(-ENOMEM);
417 goto out_no_inode;
418 }
419
420 if (inode->i_state & I_NEW) {
421 struct nfs_inode *nfsi = NFS_I(inode);
422 unsigned long now = jiffies;
423
424 /* We set i_ino for the few things that still rely on it,
425 * such as stat(2) */
426 inode->i_ino = hash;
427
428 /* We can't support update_atime(), since the server will reset it */
429 inode->i_flags |= S_NOATIME|S_NOCMTIME;
430 inode->i_mode = fattr->mode;
431 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
432 && nfs_server_capable(inode, NFS_CAP_MODE))
433 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
434 /* Why so? Because we want revalidate for devices/FIFOs, and
435 * that's precisely what we have in nfs_file_inode_operations.
436 */
437 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
438 if (S_ISREG(inode->i_mode)) {
439 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
440 inode->i_data.a_ops = &nfs_file_aops;
441 } else if (S_ISDIR(inode->i_mode)) {
442 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
443 inode->i_fop = &nfs_dir_operations;
444 inode->i_data.a_ops = &nfs_dir_aops;
445 /* Deal with crossing mountpoints */
446 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
447 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
448 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
449 inode->i_op = &nfs_referral_inode_operations;
450 else
451 inode->i_op = &nfs_mountpoint_inode_operations;
452 inode->i_fop = NULL;
453 inode->i_flags |= S_AUTOMOUNT;
454 }
455 } else if (S_ISLNK(inode->i_mode)) {
456 inode->i_op = &nfs_symlink_inode_operations;
457 inode_nohighmem(inode);
458 } else
459 init_special_inode(inode, inode->i_mode, fattr->rdev);
460
461 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
462 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
463 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
464 inode->i_version = 0;
465 inode->i_size = 0;
466 clear_nlink(inode);
467 inode->i_uid = make_kuid(&init_user_ns, -2);
468 inode->i_gid = make_kgid(&init_user_ns, -2);
469 inode->i_blocks = 0;
470 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
471 nfsi->write_io = 0;
472 nfsi->read_io = 0;
473
474 nfsi->read_cache_jiffies = fattr->time_start;
475 nfsi->attr_gencount = fattr->gencount;
476 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
477 inode->i_atime = fattr->atime;
478 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
479 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
480 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
481 inode->i_mtime = fattr->mtime;
482 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
483 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
484 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
485 inode->i_ctime = fattr->ctime;
486 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
487 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
488 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
489 inode->i_version = fattr->change_attr;
490 else
491 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
492 | NFS_INO_REVAL_PAGECACHE);
493 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
494 inode->i_size = nfs_size_to_loff_t(fattr->size);
495 else
496 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
497 | NFS_INO_REVAL_PAGECACHE);
498 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
499 set_nlink(inode, fattr->nlink);
500 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
501 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
502 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
503 inode->i_uid = fattr->uid;
504 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
505 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
506 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
507 inode->i_gid = fattr->gid;
508 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
510 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
511 inode->i_blocks = fattr->du.nfs2.blocks;
512 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
513 /*
514 * report the blocks in 512byte units
515 */
516 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
517 }
518
519 nfs_setsecurity(inode, fattr, label);
520
521 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
522 nfsi->attrtimeo_timestamp = now;
523 nfsi->access_cache = RB_ROOT;
524
525 nfs_fscache_init_inode(inode);
526
527 unlock_new_inode(inode);
528 } else
529 nfs_refresh_inode(inode, fattr);
530 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
531 inode->i_sb->s_id,
532 (unsigned long long)NFS_FILEID(inode),
533 nfs_display_fhandle_hash(fh),
534 atomic_read(&inode->i_count));
535
536 out:
537 return inode;
538
539 out_no_inode:
540 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
541 goto out;
542 }
543 EXPORT_SYMBOL_GPL(nfs_fhget);
544
545 #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)
546
547 int
548 nfs_setattr(struct dentry *dentry, struct iattr *attr)
549 {
550 struct inode *inode = d_inode(dentry);
551 struct nfs_fattr *fattr;
552 int error = 0;
553
554 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
555
556 /* skip mode change if it's just for clearing setuid/setgid */
557 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
558 attr->ia_valid &= ~ATTR_MODE;
559
560 if (attr->ia_valid & ATTR_SIZE) {
561 BUG_ON(!S_ISREG(inode->i_mode));
562
563 error = inode_newsize_ok(inode, attr->ia_size);
564 if (error)
565 return error;
566
567 if (attr->ia_size == i_size_read(inode))
568 attr->ia_valid &= ~ATTR_SIZE;
569 }
570
571 /* Optimization: if the end result is no change, don't RPC */
572 attr->ia_valid &= NFS_VALID_ATTRS;
573 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
574 return 0;
575
576 trace_nfs_setattr_enter(inode);
577
578 /* Write all dirty data */
579 if (S_ISREG(inode->i_mode))
580 nfs_sync_inode(inode);
581
582 fattr = nfs_alloc_fattr();
583 if (fattr == NULL) {
584 error = -ENOMEM;
585 goto out;
586 }
587
588 /*
589 * Return any delegations if we're going to change ACLs
590 */
591 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
592 NFS_PROTO(inode)->return_delegation(inode);
593 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
594 if (error == 0)
595 error = nfs_refresh_inode(inode, fattr);
596 nfs_free_fattr(fattr);
597 out:
598 trace_nfs_setattr_exit(inode, error);
599 return error;
600 }
601 EXPORT_SYMBOL_GPL(nfs_setattr);
602
603 /**
604 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
605 * @inode: inode of the file used
606 * @offset: file offset to start truncating
607 *
608 * This is a copy of the common vmtruncate, but with the locking
609 * corrected to take into account the fact that NFS requires
610 * inode->i_size to be updated under the inode->i_lock.
611 * Note: must be called with inode->i_lock held!
612 */
613 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
614 {
615 int err;
616
617 err = inode_newsize_ok(inode, offset);
618 if (err)
619 goto out;
620
621 i_size_write(inode, offset);
622 /* Optimisation */
623 if (offset == 0)
624 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
625
626 spin_unlock(&inode->i_lock);
627 truncate_pagecache(inode, offset);
628 spin_lock(&inode->i_lock);
629 out:
630 return err;
631 }
632
633 /**
634 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
635 * @inode: pointer to struct inode
636 * @attr: pointer to struct iattr
637 *
638 * Note: we do this in the *proc.c in order to ensure that
639 * it works for things like exclusive creates too.
640 */
641 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
642 struct nfs_fattr *fattr)
643 {
644 /* Barrier: bump the attribute generation count. */
645 nfs_fattr_set_barrier(fattr);
646
647 spin_lock(&inode->i_lock);
648 NFS_I(inode)->attr_gencount = fattr->gencount;
649 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
650 if ((attr->ia_valid & ATTR_MODE) != 0) {
651 int mode = attr->ia_mode & S_IALLUGO;
652 mode |= inode->i_mode & ~S_IALLUGO;
653 inode->i_mode = mode;
654 }
655 if ((attr->ia_valid & ATTR_UID) != 0)
656 inode->i_uid = attr->ia_uid;
657 if ((attr->ia_valid & ATTR_GID) != 0)
658 inode->i_gid = attr->ia_gid;
659 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
660 | NFS_INO_INVALID_ACL);
661 }
662 if ((attr->ia_valid & ATTR_SIZE) != 0) {
663 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
664 nfs_vmtruncate(inode, attr->ia_size);
665 }
666 if (fattr->valid)
667 nfs_update_inode(inode, fattr);
668 else
669 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
670 spin_unlock(&inode->i_lock);
671 }
672 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
673
674 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
675 {
676 struct dentry *parent;
677
678 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
679 return;
680 parent = dget_parent(dentry);
681 nfs_force_use_readdirplus(d_inode(parent));
682 dput(parent);
683 }
684
685 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
686 {
687 struct dentry *parent;
688
689 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
690 return;
691 parent = dget_parent(dentry);
692 nfs_advise_use_readdirplus(d_inode(parent));
693 dput(parent);
694 }
695
696 static bool nfs_need_revalidate_inode(struct inode *inode)
697 {
698 if (NFS_I(inode)->cache_validity &
699 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
700 return true;
701 if (nfs_attribute_cache_expired(inode))
702 return true;
703 return false;
704 }
705
706 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
707 {
708 struct inode *inode = d_inode(dentry);
709 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
710 int err = 0;
711
712 trace_nfs_getattr_enter(inode);
713 /* Flush out writes to the server in order to update c/mtime. */
714 if (S_ISREG(inode->i_mode)) {
715 err = filemap_write_and_wait(inode->i_mapping);
716 if (err)
717 goto out;
718 }
719
720 /*
721 * We may force a getattr if the user cares about atime.
722 *
723 * Note that we only have to check the vfsmount flags here:
724 * - NFS always sets S_NOATIME by so checking it would give a
725 * bogus result
726 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
727 * no point in checking those.
728 */
729 if ((mnt->mnt_flags & MNT_NOATIME) ||
730 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
731 need_atime = 0;
732
733 if (need_atime || nfs_need_revalidate_inode(inode)) {
734 struct nfs_server *server = NFS_SERVER(inode);
735
736 nfs_readdirplus_parent_cache_miss(dentry);
737 err = __nfs_revalidate_inode(server, inode);
738 } else
739 nfs_readdirplus_parent_cache_hit(dentry);
740 if (!err) {
741 generic_fillattr(inode, stat);
742 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
743 if (S_ISDIR(inode->i_mode))
744 stat->blksize = NFS_SERVER(inode)->dtsize;
745 }
746 out:
747 trace_nfs_getattr_exit(inode, err);
748 return err;
749 }
750 EXPORT_SYMBOL_GPL(nfs_getattr);
751
752 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
753 {
754 atomic_set(&l_ctx->count, 1);
755 l_ctx->lockowner = current->files;
756 INIT_LIST_HEAD(&l_ctx->list);
757 atomic_set(&l_ctx->io_count, 0);
758 }
759
760 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
761 {
762 struct nfs_lock_context *head = &ctx->lock_context;
763 struct nfs_lock_context *pos = head;
764
765 do {
766 if (pos->lockowner != current->files)
767 continue;
768 atomic_inc(&pos->count);
769 return pos;
770 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
771 return NULL;
772 }
773
774 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
775 {
776 struct nfs_lock_context *res, *new = NULL;
777 struct inode *inode = d_inode(ctx->dentry);
778
779 spin_lock(&inode->i_lock);
780 res = __nfs_find_lock_context(ctx);
781 if (res == NULL) {
782 spin_unlock(&inode->i_lock);
783 new = kmalloc(sizeof(*new), GFP_KERNEL);
784 if (new == NULL)
785 return ERR_PTR(-ENOMEM);
786 nfs_init_lock_context(new);
787 spin_lock(&inode->i_lock);
788 res = __nfs_find_lock_context(ctx);
789 if (res == NULL) {
790 list_add_tail(&new->list, &ctx->lock_context.list);
791 new->open_context = ctx;
792 res = new;
793 new = NULL;
794 }
795 }
796 spin_unlock(&inode->i_lock);
797 kfree(new);
798 return res;
799 }
800 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
801
802 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
803 {
804 struct nfs_open_context *ctx = l_ctx->open_context;
805 struct inode *inode = d_inode(ctx->dentry);
806
807 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
808 return;
809 list_del(&l_ctx->list);
810 spin_unlock(&inode->i_lock);
811 kfree(l_ctx);
812 }
813 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
814
815 /**
816 * nfs_close_context - Common close_context() routine NFSv2/v3
817 * @ctx: pointer to context
818 * @is_sync: is this a synchronous close
819 *
820 * Ensure that the attributes are up to date if we're mounted
821 * with close-to-open semantics and we have cached data that will
822 * need to be revalidated on open.
823 */
824 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
825 {
826 struct nfs_inode *nfsi;
827 struct inode *inode;
828 struct nfs_server *server;
829
830 if (!(ctx->mode & FMODE_WRITE))
831 return;
832 if (!is_sync)
833 return;
834 inode = d_inode(ctx->dentry);
835 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
836 return;
837 nfsi = NFS_I(inode);
838 if (inode->i_mapping->nrpages == 0)
839 return;
840 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
841 return;
842 if (!list_empty(&nfsi->open_files))
843 return;
844 server = NFS_SERVER(inode);
845 if (server->flags & NFS_MOUNT_NOCTO)
846 return;
847 nfs_revalidate_inode(server, inode);
848 }
849 EXPORT_SYMBOL_GPL(nfs_close_context);
850
851 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
852 fmode_t f_mode,
853 struct file *filp)
854 {
855 struct nfs_open_context *ctx;
856 struct rpc_cred *cred = rpc_lookup_cred();
857 if (IS_ERR(cred))
858 return ERR_CAST(cred);
859
860 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
861 if (!ctx) {
862 put_rpccred(cred);
863 return ERR_PTR(-ENOMEM);
864 }
865 nfs_sb_active(dentry->d_sb);
866 ctx->dentry = dget(dentry);
867 ctx->cred = cred;
868 ctx->state = NULL;
869 ctx->mode = f_mode;
870 ctx->flags = 0;
871 ctx->error = 0;
872 ctx->flock_owner = (fl_owner_t)filp;
873 nfs_init_lock_context(&ctx->lock_context);
874 ctx->lock_context.open_context = ctx;
875 INIT_LIST_HEAD(&ctx->list);
876 ctx->mdsthreshold = NULL;
877 return ctx;
878 }
879 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
880
881 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
882 {
883 if (ctx != NULL)
884 atomic_inc(&ctx->lock_context.count);
885 return ctx;
886 }
887 EXPORT_SYMBOL_GPL(get_nfs_open_context);
888
889 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
890 {
891 struct inode *inode = d_inode(ctx->dentry);
892 struct super_block *sb = ctx->dentry->d_sb;
893
894 if (!list_empty(&ctx->list)) {
895 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
896 return;
897 list_del(&ctx->list);
898 spin_unlock(&inode->i_lock);
899 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
900 return;
901 if (inode != NULL)
902 NFS_PROTO(inode)->close_context(ctx, is_sync);
903 if (ctx->cred != NULL)
904 put_rpccred(ctx->cred);
905 dput(ctx->dentry);
906 nfs_sb_deactive(sb);
907 kfree(ctx->mdsthreshold);
908 kfree(ctx);
909 }
910
911 void put_nfs_open_context(struct nfs_open_context *ctx)
912 {
913 __put_nfs_open_context(ctx, 0);
914 }
915 EXPORT_SYMBOL_GPL(put_nfs_open_context);
916
917 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
918 {
919 __put_nfs_open_context(ctx, 1);
920 }
921
922 /*
923 * Ensure that mmap has a recent RPC credential for use when writing out
924 * shared pages
925 */
926 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
927 {
928 struct inode *inode = d_inode(ctx->dentry);
929 struct nfs_inode *nfsi = NFS_I(inode);
930
931 spin_lock(&inode->i_lock);
932 if (ctx->mode & FMODE_WRITE)
933 list_add(&ctx->list, &nfsi->open_files);
934 else
935 list_add_tail(&ctx->list, &nfsi->open_files);
936 spin_unlock(&inode->i_lock);
937 }
938 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
939
940 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
941 {
942 filp->private_data = get_nfs_open_context(ctx);
943 if (list_empty(&ctx->list))
944 nfs_inode_attach_open_context(ctx);
945 }
946 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
947
948 /*
949 * Given an inode, search for an open context with the desired characteristics
950 */
951 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
952 {
953 struct nfs_inode *nfsi = NFS_I(inode);
954 struct nfs_open_context *pos, *ctx = NULL;
955
956 spin_lock(&inode->i_lock);
957 list_for_each_entry(pos, &nfsi->open_files, list) {
958 if (cred != NULL && pos->cred != cred)
959 continue;
960 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
961 continue;
962 ctx = get_nfs_open_context(pos);
963 break;
964 }
965 spin_unlock(&inode->i_lock);
966 return ctx;
967 }
968
969 void nfs_file_clear_open_context(struct file *filp)
970 {
971 struct nfs_open_context *ctx = nfs_file_open_context(filp);
972
973 if (ctx) {
974 struct inode *inode = d_inode(ctx->dentry);
975
976 /*
977 * We fatal error on write before. Try to writeback
978 * every page again.
979 */
980 if (ctx->error < 0)
981 invalidate_inode_pages2(inode->i_mapping);
982 filp->private_data = NULL;
983 spin_lock(&inode->i_lock);
984 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
985 spin_unlock(&inode->i_lock);
986 put_nfs_open_context_sync(ctx);
987 }
988 }
989
990 /*
991 * These allocate and release file read/write context information.
992 */
993 int nfs_open(struct inode *inode, struct file *filp)
994 {
995 struct nfs_open_context *ctx;
996
997 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
998 if (IS_ERR(ctx))
999 return PTR_ERR(ctx);
1000 nfs_file_set_open_context(filp, ctx);
1001 put_nfs_open_context(ctx);
1002 nfs_fscache_open_file(inode, filp);
1003 return 0;
1004 }
1005
1006 /*
1007 * This function is called whenever some part of NFS notices that
1008 * the cached attributes have to be refreshed.
1009 */
1010 int
1011 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1012 {
1013 int status = -ESTALE;
1014 struct nfs4_label *label = NULL;
1015 struct nfs_fattr *fattr = NULL;
1016 struct nfs_inode *nfsi = NFS_I(inode);
1017
1018 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1019 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1020
1021 trace_nfs_revalidate_inode_enter(inode);
1022
1023 if (is_bad_inode(inode))
1024 goto out;
1025 if (NFS_STALE(inode))
1026 goto out;
1027
1028 /* pNFS: Attributes aren't updated until we layoutcommit */
1029 if (S_ISREG(inode->i_mode)) {
1030 status = pnfs_sync_inode(inode, false);
1031 if (status)
1032 goto out;
1033 }
1034
1035 status = -ENOMEM;
1036 fattr = nfs_alloc_fattr();
1037 if (fattr == NULL)
1038 goto out;
1039
1040 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1041
1042 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1043 if (IS_ERR(label)) {
1044 status = PTR_ERR(label);
1045 goto out;
1046 }
1047
1048 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1049 if (status != 0) {
1050 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1051 inode->i_sb->s_id,
1052 (unsigned long long)NFS_FILEID(inode), status);
1053 if (status == -ESTALE) {
1054 nfs_zap_caches(inode);
1055 if (!S_ISDIR(inode->i_mode))
1056 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1057 }
1058 goto err_out;
1059 }
1060
1061 status = nfs_refresh_inode(inode, fattr);
1062 if (status) {
1063 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1064 inode->i_sb->s_id,
1065 (unsigned long long)NFS_FILEID(inode), status);
1066 goto err_out;
1067 }
1068
1069 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1070 nfs_zap_acl_cache(inode);
1071
1072 nfs_setsecurity(inode, fattr, label);
1073
1074 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1075 inode->i_sb->s_id,
1076 (unsigned long long)NFS_FILEID(inode));
1077
1078 err_out:
1079 nfs4_label_free(label);
1080 out:
1081 nfs_free_fattr(fattr);
1082 trace_nfs_revalidate_inode_exit(inode, status);
1083 return status;
1084 }
1085
1086 int nfs_attribute_cache_expired(struct inode *inode)
1087 {
1088 if (nfs_have_delegated_attributes(inode))
1089 return 0;
1090 return nfs_attribute_timeout(inode);
1091 }
1092
1093 /**
1094 * nfs_revalidate_inode - Revalidate the inode attributes
1095 * @server - pointer to nfs_server struct
1096 * @inode - pointer to inode struct
1097 *
1098 * Updates inode attribute information by retrieving the data from the server.
1099 */
1100 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1101 {
1102 if (!nfs_need_revalidate_inode(inode))
1103 return NFS_STALE(inode) ? -ESTALE : 0;
1104 return __nfs_revalidate_inode(server, inode);
1105 }
1106 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1107
1108 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1109 {
1110 struct nfs_inode *nfsi = NFS_I(inode);
1111 int ret;
1112
1113 if (mapping->nrpages != 0) {
1114 if (S_ISREG(inode->i_mode)) {
1115 unmap_mapping_range(mapping, 0, 0, 0);
1116 ret = nfs_sync_mapping(mapping);
1117 if (ret < 0)
1118 return ret;
1119 }
1120 ret = invalidate_inode_pages2(mapping);
1121 if (ret < 0)
1122 return ret;
1123 }
1124 if (S_ISDIR(inode->i_mode)) {
1125 spin_lock(&inode->i_lock);
1126 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1127 spin_unlock(&inode->i_lock);
1128 }
1129 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1130 nfs_fscache_wait_on_invalidate(inode);
1131
1132 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1133 inode->i_sb->s_id,
1134 (unsigned long long)NFS_FILEID(inode));
1135 return 0;
1136 }
1137
1138 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1139 {
1140 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1141 NFS_STALE(inode);
1142 }
1143
1144 int nfs_revalidate_mapping_rcu(struct inode *inode)
1145 {
1146 struct nfs_inode *nfsi = NFS_I(inode);
1147 unsigned long *bitlock = &nfsi->flags;
1148 int ret = 0;
1149
1150 if (IS_SWAPFILE(inode))
1151 goto out;
1152 if (nfs_mapping_need_revalidate_inode(inode)) {
1153 ret = -ECHILD;
1154 goto out;
1155 }
1156 spin_lock(&inode->i_lock);
1157 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1158 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1159 ret = -ECHILD;
1160 spin_unlock(&inode->i_lock);
1161 out:
1162 return ret;
1163 }
1164
1165 /**
1166 * nfs_revalidate_mapping - Revalidate the pagecache
1167 * @inode - pointer to host inode
1168 * @mapping - pointer to mapping
1169 */
1170 int nfs_revalidate_mapping(struct inode *inode,
1171 struct address_space *mapping)
1172 {
1173 struct nfs_inode *nfsi = NFS_I(inode);
1174 unsigned long *bitlock = &nfsi->flags;
1175 int ret = 0;
1176
1177 /* swapfiles are not supposed to be shared. */
1178 if (IS_SWAPFILE(inode))
1179 goto out;
1180
1181 if (nfs_mapping_need_revalidate_inode(inode)) {
1182 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1183 if (ret < 0)
1184 goto out;
1185 }
1186
1187 /*
1188 * We must clear NFS_INO_INVALID_DATA first to ensure that
1189 * invalidations that come in while we're shooting down the mappings
1190 * are respected. But, that leaves a race window where one revalidator
1191 * can clear the flag, and then another checks it before the mapping
1192 * gets invalidated. Fix that by serializing access to this part of
1193 * the function.
1194 *
1195 * At the same time, we need to allow other tasks to see whether we
1196 * might be in the middle of invalidating the pages, so we only set
1197 * the bit lock here if it looks like we're going to be doing that.
1198 */
1199 for (;;) {
1200 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1201 nfs_wait_bit_killable, TASK_KILLABLE);
1202 if (ret)
1203 goto out;
1204 spin_lock(&inode->i_lock);
1205 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1206 spin_unlock(&inode->i_lock);
1207 continue;
1208 }
1209 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1210 break;
1211 spin_unlock(&inode->i_lock);
1212 goto out;
1213 }
1214
1215 set_bit(NFS_INO_INVALIDATING, bitlock);
1216 smp_wmb();
1217 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1218 spin_unlock(&inode->i_lock);
1219 trace_nfs_invalidate_mapping_enter(inode);
1220 ret = nfs_invalidate_mapping(inode, mapping);
1221 trace_nfs_invalidate_mapping_exit(inode, ret);
1222
1223 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1224 smp_mb__after_atomic();
1225 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1226 out:
1227 return ret;
1228 }
1229
1230 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1231 {
1232 struct inode *inode = &nfsi->vfs_inode;
1233
1234 assert_spin_locked(&inode->i_lock);
1235
1236 if (!S_ISREG(inode->i_mode))
1237 return false;
1238 if (list_empty(&nfsi->open_files))
1239 return false;
1240 /* Note: This relies on nfsi->open_files being ordered with writers
1241 * being placed at the head of the list.
1242 * See nfs_inode_attach_open_context()
1243 */
1244 return (list_first_entry(&nfsi->open_files,
1245 struct nfs_open_context,
1246 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1247 }
1248
1249 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1250 {
1251 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1252 }
1253
1254 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1255 {
1256 struct nfs_inode *nfsi = NFS_I(inode);
1257 unsigned long ret = 0;
1258
1259 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1260 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1261 && inode->i_version == fattr->pre_change_attr) {
1262 inode->i_version = fattr->change_attr;
1263 if (S_ISDIR(inode->i_mode))
1264 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1265 ret |= NFS_INO_INVALID_ATTR;
1266 }
1267 /* If we have atomic WCC data, we may update some attributes */
1268 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1269 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1270 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1271 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1272 ret |= NFS_INO_INVALID_ATTR;
1273 }
1274
1275 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1276 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1277 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1278 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1279 if (S_ISDIR(inode->i_mode))
1280 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1281 ret |= NFS_INO_INVALID_ATTR;
1282 }
1283 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1284 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1285 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1286 && nfsi->nrequests == 0) {
1287 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1288 ret |= NFS_INO_INVALID_ATTR;
1289 }
1290
1291 return ret;
1292 }
1293
1294 /**
1295 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1296 * @inode - pointer to inode
1297 * @fattr - updated attributes
1298 *
1299 * Verifies the attribute cache. If we have just changed the attributes,
1300 * so that fattr carries weak cache consistency data, then it may
1301 * also update the ctime/mtime/change_attribute.
1302 */
1303 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1304 {
1305 struct nfs_inode *nfsi = NFS_I(inode);
1306 loff_t cur_size, new_isize;
1307 unsigned long invalid = 0;
1308
1309
1310 if (nfs_have_delegated_attributes(inode))
1311 return 0;
1312 /* Has the inode gone and changed behind our back? */
1313 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1314 return -EIO;
1315 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1316 return -EIO;
1317
1318 if (!nfs_file_has_buffered_writers(nfsi)) {
1319 /* Verify a few of the more important attributes */
1320 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
1321 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1322
1323 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1324 invalid |= NFS_INO_INVALID_ATTR;
1325
1326 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1327 invalid |= NFS_INO_INVALID_ATTR;
1328
1329 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1330 cur_size = i_size_read(inode);
1331 new_isize = nfs_size_to_loff_t(fattr->size);
1332 if (cur_size != new_isize)
1333 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1334 }
1335 }
1336
1337 /* Have any file permissions changed? */
1338 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1339 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1340 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1341 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1342 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1343 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1344
1345 /* Has the link count changed? */
1346 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1347 invalid |= NFS_INO_INVALID_ATTR;
1348
1349 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1350 invalid |= NFS_INO_INVALID_ATIME;
1351
1352 if (invalid != 0)
1353 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1354
1355 nfsi->read_cache_jiffies = fattr->time_start;
1356 return 0;
1357 }
1358
1359 static atomic_long_t nfs_attr_generation_counter;
1360
1361 static unsigned long nfs_read_attr_generation_counter(void)
1362 {
1363 return atomic_long_read(&nfs_attr_generation_counter);
1364 }
1365
1366 unsigned long nfs_inc_attr_generation_counter(void)
1367 {
1368 return atomic_long_inc_return(&nfs_attr_generation_counter);
1369 }
1370 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1371
1372 void nfs_fattr_init(struct nfs_fattr *fattr)
1373 {
1374 fattr->valid = 0;
1375 fattr->time_start = jiffies;
1376 fattr->gencount = nfs_inc_attr_generation_counter();
1377 fattr->owner_name = NULL;
1378 fattr->group_name = NULL;
1379 }
1380 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1381
1382 /**
1383 * nfs_fattr_set_barrier
1384 * @fattr: attributes
1385 *
1386 * Used to set a barrier after an attribute was updated. This
1387 * barrier ensures that older attributes from RPC calls that may
1388 * have raced with our update cannot clobber these new values.
1389 * Note that you are still responsible for ensuring that other
1390 * operations which change the attribute on the server do not
1391 * collide.
1392 */
1393 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1394 {
1395 fattr->gencount = nfs_inc_attr_generation_counter();
1396 }
1397
1398 struct nfs_fattr *nfs_alloc_fattr(void)
1399 {
1400 struct nfs_fattr *fattr;
1401
1402 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1403 if (fattr != NULL)
1404 nfs_fattr_init(fattr);
1405 return fattr;
1406 }
1407 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1408
1409 struct nfs_fh *nfs_alloc_fhandle(void)
1410 {
1411 struct nfs_fh *fh;
1412
1413 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1414 if (fh != NULL)
1415 fh->size = 0;
1416 return fh;
1417 }
1418 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1419
1420 #ifdef NFS_DEBUG
1421 /*
1422 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1423 * in the same way that wireshark does
1424 *
1425 * @fh: file handle
1426 *
1427 * For debugging only.
1428 */
1429 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1430 {
1431 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1432 * not on the result */
1433 return nfs_fhandle_hash(fh);
1434 }
1435 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1436
1437 /*
1438 * _nfs_display_fhandle - display an NFS file handle on the console
1439 *
1440 * @fh: file handle to display
1441 * @caption: display caption
1442 *
1443 * For debugging only.
1444 */
1445 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1446 {
1447 unsigned short i;
1448
1449 if (fh == NULL || fh->size == 0) {
1450 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1451 return;
1452 }
1453
1454 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1455 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1456 for (i = 0; i < fh->size; i += 16) {
1457 __be32 *pos = (__be32 *)&fh->data[i];
1458
1459 switch ((fh->size - i - 1) >> 2) {
1460 case 0:
1461 printk(KERN_DEFAULT " %08x\n",
1462 be32_to_cpup(pos));
1463 break;
1464 case 1:
1465 printk(KERN_DEFAULT " %08x %08x\n",
1466 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1467 break;
1468 case 2:
1469 printk(KERN_DEFAULT " %08x %08x %08x\n",
1470 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1471 be32_to_cpup(pos + 2));
1472 break;
1473 default:
1474 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1475 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1476 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1477 }
1478 }
1479 }
1480 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1481 #endif
1482
1483 /**
1484 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1485 * @inode - pointer to inode
1486 * @fattr - attributes
1487 *
1488 * Attempt to divine whether or not an RPC call reply carrying stale
1489 * attributes got scheduled after another call carrying updated ones.
1490 *
1491 * To do so, the function first assumes that a more recent ctime means
1492 * that the attributes in fattr are newer, however it also attempt to
1493 * catch the case where ctime either didn't change, or went backwards
1494 * (if someone reset the clock on the server) by looking at whether
1495 * or not this RPC call was started after the inode was last updated.
1496 * Note also the check for wraparound of 'attr_gencount'
1497 *
1498 * The function returns 'true' if it thinks the attributes in 'fattr' are
1499 * more recent than the ones cached in the inode.
1500 *
1501 */
1502 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1503 {
1504 const struct nfs_inode *nfsi = NFS_I(inode);
1505
1506 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1507 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1508 }
1509
1510 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1511 {
1512 int ret;
1513
1514 trace_nfs_refresh_inode_enter(inode);
1515
1516 if (nfs_inode_attrs_need_update(inode, fattr))
1517 ret = nfs_update_inode(inode, fattr);
1518 else
1519 ret = nfs_check_inode_attributes(inode, fattr);
1520
1521 trace_nfs_refresh_inode_exit(inode, ret);
1522 return ret;
1523 }
1524
1525 /**
1526 * nfs_refresh_inode - try to update the inode attribute cache
1527 * @inode - pointer to inode
1528 * @fattr - updated attributes
1529 *
1530 * Check that an RPC call that returned attributes has not overlapped with
1531 * other recent updates of the inode metadata, then decide whether it is
1532 * safe to do a full update of the inode attributes, or whether just to
1533 * call nfs_check_inode_attributes.
1534 */
1535 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1536 {
1537 int status;
1538
1539 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1540 return 0;
1541 spin_lock(&inode->i_lock);
1542 status = nfs_refresh_inode_locked(inode, fattr);
1543 spin_unlock(&inode->i_lock);
1544
1545 return status;
1546 }
1547 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1548
1549 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1550 {
1551 unsigned long invalid = NFS_INO_INVALID_ATTR;
1552
1553 if (S_ISDIR(inode->i_mode))
1554 invalid |= NFS_INO_INVALID_DATA;
1555 nfs_set_cache_invalid(inode, invalid);
1556 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1557 return 0;
1558 return nfs_refresh_inode_locked(inode, fattr);
1559 }
1560
1561 /**
1562 * nfs_post_op_update_inode - try to update the inode attribute cache
1563 * @inode - pointer to inode
1564 * @fattr - updated attributes
1565 *
1566 * After an operation that has changed the inode metadata, mark the
1567 * attribute cache as being invalid, then try to update it.
1568 *
1569 * NB: if the server didn't return any post op attributes, this
1570 * function will force the retrieval of attributes before the next
1571 * NFS request. Thus it should be used only for operations that
1572 * are expected to change one or more attributes, to avoid
1573 * unnecessary NFS requests and trips through nfs_update_inode().
1574 */
1575 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1576 {
1577 int status;
1578
1579 spin_lock(&inode->i_lock);
1580 nfs_fattr_set_barrier(fattr);
1581 status = nfs_post_op_update_inode_locked(inode, fattr);
1582 spin_unlock(&inode->i_lock);
1583
1584 return status;
1585 }
1586 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1587
1588 /**
1589 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1590 * @inode - pointer to inode
1591 * @fattr - updated attributes
1592 *
1593 * After an operation that has changed the inode metadata, mark the
1594 * attribute cache as being invalid, then try to update it. Fake up
1595 * weak cache consistency data, if none exist.
1596 *
1597 * This function is mainly designed to be used by the ->write_done() functions.
1598 */
1599 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1600 {
1601 int status;
1602
1603 /* Don't do a WCC update if these attributes are already stale */
1604 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1605 !nfs_inode_attrs_need_update(inode, fattr)) {
1606 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1607 | NFS_ATTR_FATTR_PRESIZE
1608 | NFS_ATTR_FATTR_PREMTIME
1609 | NFS_ATTR_FATTR_PRECTIME);
1610 goto out_noforce;
1611 }
1612 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1613 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1614 fattr->pre_change_attr = inode->i_version;
1615 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1616 }
1617 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1618 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1619 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1620 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1621 }
1622 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1623 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1624 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1625 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1626 }
1627 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1628 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1629 fattr->pre_size = i_size_read(inode);
1630 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1631 }
1632 out_noforce:
1633 status = nfs_post_op_update_inode_locked(inode, fattr);
1634 return status;
1635 }
1636
1637 /**
1638 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1639 * @inode - pointer to inode
1640 * @fattr - updated attributes
1641 *
1642 * After an operation that has changed the inode metadata, mark the
1643 * attribute cache as being invalid, then try to update it. Fake up
1644 * weak cache consistency data, if none exist.
1645 *
1646 * This function is mainly designed to be used by the ->write_done() functions.
1647 */
1648 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1649 {
1650 int status;
1651
1652 spin_lock(&inode->i_lock);
1653 nfs_fattr_set_barrier(fattr);
1654 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1655 spin_unlock(&inode->i_lock);
1656 return status;
1657 }
1658 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1659
1660
1661 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1662 struct nfs_fattr *fattr)
1663 {
1664 bool ret1 = true, ret2 = true;
1665
1666 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1667 ret1 = (nfsi->fileid == fattr->fileid);
1668 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1669 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1670 return ret1 || ret2;
1671 }
1672
1673 /*
1674 * Many nfs protocol calls return the new file attributes after
1675 * an operation. Here we update the inode to reflect the state
1676 * of the server's inode.
1677 *
1678 * This is a bit tricky because we have to make sure all dirty pages
1679 * have been sent off to the server before calling invalidate_inode_pages.
1680 * To make sure no other process adds more write requests while we try
1681 * our best to flush them, we make them sleep during the attribute refresh.
1682 *
1683 * A very similar scenario holds for the dir cache.
1684 */
1685 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1686 {
1687 struct nfs_server *server;
1688 struct nfs_inode *nfsi = NFS_I(inode);
1689 loff_t cur_isize, new_isize;
1690 unsigned long invalid = 0;
1691 unsigned long now = jiffies;
1692 unsigned long save_cache_validity;
1693 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1694 bool cache_revalidated = true;
1695
1696 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1697 __func__, inode->i_sb->s_id, inode->i_ino,
1698 nfs_display_fhandle_hash(NFS_FH(inode)),
1699 atomic_read(&inode->i_count), fattr->valid);
1700
1701 if (!nfs_fileid_valid(nfsi, fattr)) {
1702 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1703 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1704 NFS_SERVER(inode)->nfs_client->cl_hostname,
1705 inode->i_sb->s_id, (long long)nfsi->fileid,
1706 (long long)fattr->fileid);
1707 goto out_err;
1708 }
1709
1710 /*
1711 * Make sure the inode's type hasn't changed.
1712 */
1713 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1714 /*
1715 * Big trouble! The inode has become a different object.
1716 */
1717 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1718 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1719 goto out_err;
1720 }
1721
1722 server = NFS_SERVER(inode);
1723 /* Update the fsid? */
1724 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1725 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1726 !IS_AUTOMOUNT(inode))
1727 server->fsid = fattr->fsid;
1728
1729 /*
1730 * Update the read time so we don't revalidate too often.
1731 */
1732 nfsi->read_cache_jiffies = fattr->time_start;
1733
1734 save_cache_validity = nfsi->cache_validity;
1735 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1736 | NFS_INO_INVALID_ATIME
1737 | NFS_INO_REVAL_FORCED
1738 | NFS_INO_REVAL_PAGECACHE);
1739
1740 /* Do atomic weak cache consistency updates */
1741 invalid |= nfs_wcc_update_inode(inode, fattr);
1742
1743 if (pnfs_layoutcommit_outstanding(inode)) {
1744 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1745 cache_revalidated = false;
1746 }
1747
1748 /* More cache consistency checks */
1749 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1750 if (inode->i_version != fattr->change_attr) {
1751 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1752 inode->i_sb->s_id, inode->i_ino);
1753 /* Could it be a race with writeback? */
1754 if (!have_writers) {
1755 invalid |= NFS_INO_INVALID_ATTR
1756 | NFS_INO_INVALID_DATA
1757 | NFS_INO_INVALID_ACCESS
1758 | NFS_INO_INVALID_ACL;
1759 if (S_ISDIR(inode->i_mode))
1760 nfs_force_lookup_revalidate(inode);
1761 }
1762 inode->i_version = fattr->change_attr;
1763 }
1764 } else {
1765 nfsi->cache_validity |= save_cache_validity;
1766 cache_revalidated = false;
1767 }
1768
1769 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1770 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1771 } else if (server->caps & NFS_CAP_MTIME) {
1772 nfsi->cache_validity |= save_cache_validity &
1773 (NFS_INO_INVALID_ATTR
1774 | NFS_INO_REVAL_FORCED);
1775 cache_revalidated = false;
1776 }
1777
1778 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1779 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1780 } else if (server->caps & NFS_CAP_CTIME) {
1781 nfsi->cache_validity |= save_cache_validity &
1782 (NFS_INO_INVALID_ATTR
1783 | NFS_INO_REVAL_FORCED);
1784 cache_revalidated = false;
1785 }
1786
1787 /* Check if our cached file size is stale */
1788 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1789 new_isize = nfs_size_to_loff_t(fattr->size);
1790 cur_isize = i_size_read(inode);
1791 if (new_isize != cur_isize) {
1792 /* Do we perhaps have any outstanding writes, or has
1793 * the file grown beyond our last write? */
1794 if (nfsi->nrequests == 0 || new_isize > cur_isize) {
1795 i_size_write(inode, new_isize);
1796 if (!have_writers)
1797 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1798 }
1799 dprintk("NFS: isize change on server for file %s/%ld "
1800 "(%Ld to %Ld)\n",
1801 inode->i_sb->s_id,
1802 inode->i_ino,
1803 (long long)cur_isize,
1804 (long long)new_isize);
1805 }
1806 } else {
1807 nfsi->cache_validity |= save_cache_validity &
1808 (NFS_INO_INVALID_ATTR
1809 | NFS_INO_REVAL_PAGECACHE
1810 | NFS_INO_REVAL_FORCED);
1811 cache_revalidated = false;
1812 }
1813
1814
1815 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1816 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1817 else if (server->caps & NFS_CAP_ATIME) {
1818 nfsi->cache_validity |= save_cache_validity &
1819 (NFS_INO_INVALID_ATIME
1820 | NFS_INO_REVAL_FORCED);
1821 cache_revalidated = false;
1822 }
1823
1824 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1825 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1826 umode_t newmode = inode->i_mode & S_IFMT;
1827 newmode |= fattr->mode & S_IALLUGO;
1828 inode->i_mode = newmode;
1829 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1830 }
1831 } else if (server->caps & NFS_CAP_MODE) {
1832 nfsi->cache_validity |= save_cache_validity &
1833 (NFS_INO_INVALID_ATTR
1834 | NFS_INO_INVALID_ACCESS
1835 | NFS_INO_INVALID_ACL
1836 | NFS_INO_REVAL_FORCED);
1837 cache_revalidated = false;
1838 }
1839
1840 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1841 if (!uid_eq(inode->i_uid, fattr->uid)) {
1842 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1843 inode->i_uid = fattr->uid;
1844 }
1845 } else if (server->caps & NFS_CAP_OWNER) {
1846 nfsi->cache_validity |= save_cache_validity &
1847 (NFS_INO_INVALID_ATTR
1848 | NFS_INO_INVALID_ACCESS
1849 | NFS_INO_INVALID_ACL
1850 | NFS_INO_REVAL_FORCED);
1851 cache_revalidated = false;
1852 }
1853
1854 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1855 if (!gid_eq(inode->i_gid, fattr->gid)) {
1856 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1857 inode->i_gid = fattr->gid;
1858 }
1859 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1860 nfsi->cache_validity |= save_cache_validity &
1861 (NFS_INO_INVALID_ATTR
1862 | NFS_INO_INVALID_ACCESS
1863 | NFS_INO_INVALID_ACL
1864 | NFS_INO_REVAL_FORCED);
1865 cache_revalidated = false;
1866 }
1867
1868 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1869 if (inode->i_nlink != fattr->nlink) {
1870 invalid |= NFS_INO_INVALID_ATTR;
1871 if (S_ISDIR(inode->i_mode))
1872 invalid |= NFS_INO_INVALID_DATA;
1873 set_nlink(inode, fattr->nlink);
1874 }
1875 } else if (server->caps & NFS_CAP_NLINK) {
1876 nfsi->cache_validity |= save_cache_validity &
1877 (NFS_INO_INVALID_ATTR
1878 | NFS_INO_REVAL_FORCED);
1879 cache_revalidated = false;
1880 }
1881
1882 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1883 /*
1884 * report the blocks in 512byte units
1885 */
1886 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1887 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1888 inode->i_blocks = fattr->du.nfs2.blocks;
1889 else
1890 cache_revalidated = false;
1891
1892 /* Update attrtimeo value if we're out of the unstable period */
1893 if (invalid & NFS_INO_INVALID_ATTR) {
1894 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1895 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1896 nfsi->attrtimeo_timestamp = now;
1897 /* Set barrier to be more recent than all outstanding updates */
1898 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1899 } else {
1900 if (cache_revalidated) {
1901 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1902 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1903 nfsi->attrtimeo <<= 1;
1904 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1905 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1906 }
1907 nfsi->attrtimeo_timestamp = now;
1908 }
1909 /* Set the barrier to be more recent than this fattr */
1910 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1911 nfsi->attr_gencount = fattr->gencount;
1912 }
1913
1914 /* Don't declare attrcache up to date if there were no attrs! */
1915 if (cache_revalidated)
1916 invalid &= ~NFS_INO_INVALID_ATTR;
1917
1918 /* Don't invalidate the data if we were to blame */
1919 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1920 || S_ISLNK(inode->i_mode)))
1921 invalid &= ~NFS_INO_INVALID_DATA;
1922 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1923 (save_cache_validity & NFS_INO_REVAL_FORCED))
1924 nfs_set_cache_invalid(inode, invalid);
1925
1926 return 0;
1927 out_err:
1928 /*
1929 * No need to worry about unhashing the dentry, as the
1930 * lookup validation will know that the inode is bad.
1931 * (But we fall through to invalidate the caches.)
1932 */
1933 nfs_invalidate_inode(inode);
1934 return -ESTALE;
1935 }
1936
1937 struct inode *nfs_alloc_inode(struct super_block *sb)
1938 {
1939 struct nfs_inode *nfsi;
1940 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1941 if (!nfsi)
1942 return NULL;
1943 nfsi->flags = 0UL;
1944 nfsi->cache_validity = 0UL;
1945 #if IS_ENABLED(CONFIG_NFS_V4)
1946 nfsi->nfs4_acl = NULL;
1947 #endif /* CONFIG_NFS_V4 */
1948 return &nfsi->vfs_inode;
1949 }
1950 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1951
1952 static void nfs_i_callback(struct rcu_head *head)
1953 {
1954 struct inode *inode = container_of(head, struct inode, i_rcu);
1955 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1956 }
1957
1958 void nfs_destroy_inode(struct inode *inode)
1959 {
1960 call_rcu(&inode->i_rcu, nfs_i_callback);
1961 }
1962 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1963
1964 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1965 {
1966 #if IS_ENABLED(CONFIG_NFS_V4)
1967 INIT_LIST_HEAD(&nfsi->open_states);
1968 nfsi->delegation = NULL;
1969 init_rwsem(&nfsi->rwsem);
1970 nfsi->layout = NULL;
1971 #endif
1972 }
1973
1974 static void init_once(void *foo)
1975 {
1976 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1977
1978 inode_init_once(&nfsi->vfs_inode);
1979 INIT_LIST_HEAD(&nfsi->open_files);
1980 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1981 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1982 INIT_LIST_HEAD(&nfsi->commit_info.list);
1983 nfsi->nrequests = 0;
1984 nfsi->commit_info.ncommit = 0;
1985 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1986 init_rwsem(&nfsi->rmdir_sem);
1987 nfs4_init_once(nfsi);
1988 }
1989
1990 static int __init nfs_init_inodecache(void)
1991 {
1992 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1993 sizeof(struct nfs_inode),
1994 0, (SLAB_RECLAIM_ACCOUNT|
1995 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1996 init_once);
1997 if (nfs_inode_cachep == NULL)
1998 return -ENOMEM;
1999
2000 return 0;
2001 }
2002
2003 static void nfs_destroy_inodecache(void)
2004 {
2005 /*
2006 * Make sure all delayed rcu free inodes are flushed before we
2007 * destroy cache.
2008 */
2009 rcu_barrier();
2010 kmem_cache_destroy(nfs_inode_cachep);
2011 }
2012
2013 struct workqueue_struct *nfsiod_workqueue;
2014 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2015
2016 /*
2017 * start up the nfsiod workqueue
2018 */
2019 static int nfsiod_start(void)
2020 {
2021 struct workqueue_struct *wq;
2022 dprintk("RPC: creating workqueue nfsiod\n");
2023 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2024 if (wq == NULL)
2025 return -ENOMEM;
2026 nfsiod_workqueue = wq;
2027 return 0;
2028 }
2029
2030 /*
2031 * Destroy the nfsiod workqueue
2032 */
2033 static void nfsiod_stop(void)
2034 {
2035 struct workqueue_struct *wq;
2036
2037 wq = nfsiod_workqueue;
2038 if (wq == NULL)
2039 return;
2040 nfsiod_workqueue = NULL;
2041 destroy_workqueue(wq);
2042 }
2043
2044 unsigned int nfs_net_id;
2045 EXPORT_SYMBOL_GPL(nfs_net_id);
2046
2047 static int nfs_net_init(struct net *net)
2048 {
2049 nfs_clients_init(net);
2050 return nfs_fs_proc_net_init(net);
2051 }
2052
2053 static void nfs_net_exit(struct net *net)
2054 {
2055 nfs_fs_proc_net_exit(net);
2056 nfs_cleanup_cb_ident_idr(net);
2057 }
2058
2059 static struct pernet_operations nfs_net_ops = {
2060 .init = nfs_net_init,
2061 .exit = nfs_net_exit,
2062 .id = &nfs_net_id,
2063 .size = sizeof(struct nfs_net),
2064 };
2065
2066 /*
2067 * Initialize NFS
2068 */
2069 static int __init init_nfs_fs(void)
2070 {
2071 int err;
2072
2073 err = register_pernet_subsys(&nfs_net_ops);
2074 if (err < 0)
2075 goto out9;
2076
2077 err = nfs_fscache_register();
2078 if (err < 0)
2079 goto out8;
2080
2081 err = nfsiod_start();
2082 if (err)
2083 goto out7;
2084
2085 err = nfs_fs_proc_init();
2086 if (err)
2087 goto out6;
2088
2089 err = nfs_init_nfspagecache();
2090 if (err)
2091 goto out5;
2092
2093 err = nfs_init_inodecache();
2094 if (err)
2095 goto out4;
2096
2097 err = nfs_init_readpagecache();
2098 if (err)
2099 goto out3;
2100
2101 err = nfs_init_writepagecache();
2102 if (err)
2103 goto out2;
2104
2105 err = nfs_init_directcache();
2106 if (err)
2107 goto out1;
2108
2109 rpc_proc_register(&init_net, &nfs_rpcstat);
2110
2111 err = register_nfs_fs();
2112 if (err)
2113 goto out0;
2114
2115 return 0;
2116 out0:
2117 rpc_proc_unregister(&init_net, "nfs");
2118 nfs_destroy_directcache();
2119 out1:
2120 nfs_destroy_writepagecache();
2121 out2:
2122 nfs_destroy_readpagecache();
2123 out3:
2124 nfs_destroy_inodecache();
2125 out4:
2126 nfs_destroy_nfspagecache();
2127 out5:
2128 nfs_fs_proc_exit();
2129 out6:
2130 nfsiod_stop();
2131 out7:
2132 nfs_fscache_unregister();
2133 out8:
2134 unregister_pernet_subsys(&nfs_net_ops);
2135 out9:
2136 return err;
2137 }
2138
2139 static void __exit exit_nfs_fs(void)
2140 {
2141 nfs_destroy_directcache();
2142 nfs_destroy_writepagecache();
2143 nfs_destroy_readpagecache();
2144 nfs_destroy_inodecache();
2145 nfs_destroy_nfspagecache();
2146 nfs_fscache_unregister();
2147 unregister_pernet_subsys(&nfs_net_ops);
2148 rpc_proc_unregister(&init_net, "nfs");
2149 unregister_nfs_fs();
2150 nfs_fs_proc_exit();
2151 nfsiod_stop();
2152 }
2153
2154 /* Not quite true; I just maintain it */
2155 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2156 MODULE_LICENSE("GPL");
2157 module_param(enable_ino64, bool, 0644);
2158
2159 module_init(init_nfs_fs)
2160 module_exit(exit_nfs_fs)
Linux with added FPC-III support