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NFS: Add attribute update barriers to NFS writebacks
[deliverable/linux.git] / fs / nfs / inode.c
1 /*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sched.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 <asm/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 /**
75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
76 * @word: long word containing the bit lock
77 */
78 int nfs_wait_bit_killable(struct wait_bit_key *key)
79 {
80 if (fatal_signal_pending(current))
81 return -ERESTARTSYS;
82 freezable_schedule_unsafe();
83 return 0;
84 }
85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
86
87 /**
88 * nfs_compat_user_ino64 - returns the user-visible inode number
89 * @fileid: 64-bit fileid
90 *
91 * This function returns a 32-bit inode number if the boot parameter
92 * nfs.enable_ino64 is zero.
93 */
94 u64 nfs_compat_user_ino64(u64 fileid)
95 {
96 #ifdef CONFIG_COMPAT
97 compat_ulong_t ino;
98 #else
99 unsigned long ino;
100 #endif
101
102 if (enable_ino64)
103 return fileid;
104 ino = fileid;
105 if (sizeof(ino) < sizeof(fileid))
106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107 return ino;
108 }
109
110 int nfs_drop_inode(struct inode *inode)
111 {
112 return NFS_STALE(inode) || generic_drop_inode(inode);
113 }
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
115
116 void nfs_clear_inode(struct inode *inode)
117 {
118 /*
119 * The following should never happen...
120 */
121 WARN_ON_ONCE(nfs_have_writebacks(inode));
122 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123 nfs_zap_acl_cache(inode);
124 nfs_access_zap_cache(inode);
125 nfs_fscache_clear_inode(inode);
126 }
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
128
129 void nfs_evict_inode(struct inode *inode)
130 {
131 truncate_inode_pages_final(&inode->i_data);
132 clear_inode(inode);
133 nfs_clear_inode(inode);
134 }
135
136 /**
137 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
138 */
139 int nfs_sync_mapping(struct address_space *mapping)
140 {
141 int ret = 0;
142
143 if (mapping->nrpages != 0) {
144 unmap_mapping_range(mapping, 0, 0, 0);
145 ret = nfs_wb_all(mapping->host);
146 }
147 return ret;
148 }
149
150 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
151 {
152 struct nfs_inode *nfsi = NFS_I(inode);
153
154 if (inode->i_mapping->nrpages == 0)
155 flags &= ~NFS_INO_INVALID_DATA;
156 nfsi->cache_validity |= flags;
157 if (flags & NFS_INO_INVALID_DATA)
158 nfs_fscache_invalidate(inode);
159 }
160
161 /*
162 * Invalidate the local caches
163 */
164 static void nfs_zap_caches_locked(struct inode *inode)
165 {
166 struct nfs_inode *nfsi = NFS_I(inode);
167 int mode = inode->i_mode;
168
169 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
170
171 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
172 nfsi->attrtimeo_timestamp = jiffies;
173
174 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
175 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
176 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
177 | NFS_INO_INVALID_DATA
178 | NFS_INO_INVALID_ACCESS
179 | NFS_INO_INVALID_ACL
180 | NFS_INO_REVAL_PAGECACHE);
181 } else
182 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
183 | NFS_INO_INVALID_ACCESS
184 | NFS_INO_INVALID_ACL
185 | NFS_INO_REVAL_PAGECACHE);
186 nfs_zap_label_cache_locked(nfsi);
187 }
188
189 void nfs_zap_caches(struct inode *inode)
190 {
191 spin_lock(&inode->i_lock);
192 nfs_zap_caches_locked(inode);
193 spin_unlock(&inode->i_lock);
194 }
195 EXPORT_SYMBOL_GPL(nfs_zap_caches);
196
197 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
198 {
199 if (mapping->nrpages != 0) {
200 spin_lock(&inode->i_lock);
201 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
202 spin_unlock(&inode->i_lock);
203 }
204 }
205
206 void nfs_zap_acl_cache(struct inode *inode)
207 {
208 void (*clear_acl_cache)(struct inode *);
209
210 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
211 if (clear_acl_cache != NULL)
212 clear_acl_cache(inode);
213 spin_lock(&inode->i_lock);
214 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
215 spin_unlock(&inode->i_lock);
216 }
217 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
218
219 void nfs_invalidate_atime(struct inode *inode)
220 {
221 spin_lock(&inode->i_lock);
222 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
223 spin_unlock(&inode->i_lock);
224 }
225 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
226
227 /*
228 * Invalidate, but do not unhash, the inode.
229 * NB: must be called with inode->i_lock held!
230 */
231 static void nfs_invalidate_inode(struct inode *inode)
232 {
233 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
234 nfs_zap_caches_locked(inode);
235 }
236
237 struct nfs_find_desc {
238 struct nfs_fh *fh;
239 struct nfs_fattr *fattr;
240 };
241
242 /*
243 * In NFSv3 we can have 64bit inode numbers. In order to support
244 * this, and re-exported directories (also seen in NFSv2)
245 * we are forced to allow 2 different inodes to have the same
246 * i_ino.
247 */
248 static int
249 nfs_find_actor(struct inode *inode, void *opaque)
250 {
251 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
252 struct nfs_fh *fh = desc->fh;
253 struct nfs_fattr *fattr = desc->fattr;
254
255 if (NFS_FILEID(inode) != fattr->fileid)
256 return 0;
257 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
258 return 0;
259 if (nfs_compare_fh(NFS_FH(inode), fh))
260 return 0;
261 if (is_bad_inode(inode) || NFS_STALE(inode))
262 return 0;
263 return 1;
264 }
265
266 static int
267 nfs_init_locked(struct inode *inode, void *opaque)
268 {
269 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
270 struct nfs_fattr *fattr = desc->fattr;
271
272 set_nfs_fileid(inode, fattr->fileid);
273 nfs_copy_fh(NFS_FH(inode), desc->fh);
274 return 0;
275 }
276
277 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
278 static void nfs_clear_label_invalid(struct inode *inode)
279 {
280 spin_lock(&inode->i_lock);
281 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
282 spin_unlock(&inode->i_lock);
283 }
284
285 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
286 struct nfs4_label *label)
287 {
288 int error;
289
290 if (label == NULL)
291 return;
292
293 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
294 error = security_inode_notifysecctx(inode, label->label,
295 label->len);
296 if (error)
297 printk(KERN_ERR "%s() %s %d "
298 "security_inode_notifysecctx() %d\n",
299 __func__,
300 (char *)label->label,
301 label->len, error);
302 nfs_clear_label_invalid(inode);
303 }
304 }
305
306 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
307 {
308 struct nfs4_label *label = NULL;
309 int minor_version = server->nfs_client->cl_minorversion;
310
311 if (minor_version < 2)
312 return label;
313
314 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
315 return label;
316
317 label = kzalloc(sizeof(struct nfs4_label), flags);
318 if (label == NULL)
319 return ERR_PTR(-ENOMEM);
320
321 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
322 if (label->label == NULL) {
323 kfree(label);
324 return ERR_PTR(-ENOMEM);
325 }
326 label->len = NFS4_MAXLABELLEN;
327
328 return label;
329 }
330 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
331 #else
332 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
333 struct nfs4_label *label)
334 {
335 }
336 #endif
337 EXPORT_SYMBOL_GPL(nfs_setsecurity);
338
339 /*
340 * This is our front-end to iget that looks up inodes by file handle
341 * instead of inode number.
342 */
343 struct inode *
344 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
345 {
346 struct nfs_find_desc desc = {
347 .fh = fh,
348 .fattr = fattr
349 };
350 struct inode *inode = ERR_PTR(-ENOENT);
351 unsigned long hash;
352
353 nfs_attr_check_mountpoint(sb, fattr);
354
355 if (nfs_attr_use_mounted_on_fileid(fattr))
356 fattr->fileid = fattr->mounted_on_fileid;
357 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
358 goto out_no_inode;
359 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
360 goto out_no_inode;
361
362 hash = nfs_fattr_to_ino_t(fattr);
363
364 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
365 if (inode == NULL) {
366 inode = ERR_PTR(-ENOMEM);
367 goto out_no_inode;
368 }
369
370 if (inode->i_state & I_NEW) {
371 struct nfs_inode *nfsi = NFS_I(inode);
372 unsigned long now = jiffies;
373
374 /* We set i_ino for the few things that still rely on it,
375 * such as stat(2) */
376 inode->i_ino = hash;
377
378 /* We can't support update_atime(), since the server will reset it */
379 inode->i_flags |= S_NOATIME|S_NOCMTIME;
380 inode->i_mode = fattr->mode;
381 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
382 && nfs_server_capable(inode, NFS_CAP_MODE))
383 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
384 /* Why so? Because we want revalidate for devices/FIFOs, and
385 * that's precisely what we have in nfs_file_inode_operations.
386 */
387 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
388 if (S_ISREG(inode->i_mode)) {
389 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
390 inode->i_data.a_ops = &nfs_file_aops;
391 } else if (S_ISDIR(inode->i_mode)) {
392 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
393 inode->i_fop = &nfs_dir_operations;
394 inode->i_data.a_ops = &nfs_dir_aops;
395 /* Deal with crossing mountpoints */
396 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
397 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
398 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
399 inode->i_op = &nfs_referral_inode_operations;
400 else
401 inode->i_op = &nfs_mountpoint_inode_operations;
402 inode->i_fop = NULL;
403 inode->i_flags |= S_AUTOMOUNT;
404 }
405 } else if (S_ISLNK(inode->i_mode))
406 inode->i_op = &nfs_symlink_inode_operations;
407 else
408 init_special_inode(inode, inode->i_mode, fattr->rdev);
409
410 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
411 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
412 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
413 inode->i_version = 0;
414 inode->i_size = 0;
415 clear_nlink(inode);
416 inode->i_uid = make_kuid(&init_user_ns, -2);
417 inode->i_gid = make_kgid(&init_user_ns, -2);
418 inode->i_blocks = 0;
419 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
420 nfsi->write_io = 0;
421 nfsi->read_io = 0;
422
423 nfsi->read_cache_jiffies = fattr->time_start;
424 nfsi->attr_gencount = fattr->gencount;
425 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
426 inode->i_atime = fattr->atime;
427 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
428 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
429 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
430 inode->i_mtime = fattr->mtime;
431 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
432 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
433 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
434 inode->i_ctime = fattr->ctime;
435 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
436 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
437 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
438 inode->i_version = fattr->change_attr;
439 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
440 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
441 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
442 inode->i_size = nfs_size_to_loff_t(fattr->size);
443 else
444 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
445 | NFS_INO_REVAL_PAGECACHE);
446 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
447 set_nlink(inode, fattr->nlink);
448 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
449 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
450 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
451 inode->i_uid = fattr->uid;
452 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
453 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
454 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
455 inode->i_gid = fattr->gid;
456 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
457 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
458 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
459 inode->i_blocks = fattr->du.nfs2.blocks;
460 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
461 /*
462 * report the blocks in 512byte units
463 */
464 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
465 }
466
467 nfs_setsecurity(inode, fattr, label);
468
469 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
470 nfsi->attrtimeo_timestamp = now;
471 nfsi->access_cache = RB_ROOT;
472
473 nfs_fscache_init_inode(inode);
474
475 unlock_new_inode(inode);
476 } else
477 nfs_refresh_inode(inode, fattr);
478 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
479 inode->i_sb->s_id,
480 (unsigned long long)NFS_FILEID(inode),
481 nfs_display_fhandle_hash(fh),
482 atomic_read(&inode->i_count));
483
484 out:
485 return inode;
486
487 out_no_inode:
488 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
489 goto out;
490 }
491 EXPORT_SYMBOL_GPL(nfs_fhget);
492
493 #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)
494
495 int
496 nfs_setattr(struct dentry *dentry, struct iattr *attr)
497 {
498 struct inode *inode = dentry->d_inode;
499 struct nfs_fattr *fattr;
500 int error = -ENOMEM;
501
502 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
503
504 /* skip mode change if it's just for clearing setuid/setgid */
505 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
506 attr->ia_valid &= ~ATTR_MODE;
507
508 if (attr->ia_valid & ATTR_SIZE) {
509 loff_t i_size;
510
511 BUG_ON(!S_ISREG(inode->i_mode));
512
513 i_size = i_size_read(inode);
514 if (attr->ia_size == i_size)
515 attr->ia_valid &= ~ATTR_SIZE;
516 else if (attr->ia_size < i_size && IS_SWAPFILE(inode))
517 return -ETXTBSY;
518 }
519
520 /* Optimization: if the end result is no change, don't RPC */
521 attr->ia_valid &= NFS_VALID_ATTRS;
522 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
523 return 0;
524
525 trace_nfs_setattr_enter(inode);
526
527 /* Write all dirty data */
528 if (S_ISREG(inode->i_mode)) {
529 nfs_inode_dio_wait(inode);
530 nfs_wb_all(inode);
531 }
532
533 fattr = nfs_alloc_fattr();
534 if (fattr == NULL)
535 goto out;
536 /*
537 * Return any delegations if we're going to change ACLs
538 */
539 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
540 NFS_PROTO(inode)->return_delegation(inode);
541 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
542 if (error == 0)
543 error = nfs_refresh_inode(inode, fattr);
544 nfs_free_fattr(fattr);
545 out:
546 trace_nfs_setattr_exit(inode, error);
547 return error;
548 }
549 EXPORT_SYMBOL_GPL(nfs_setattr);
550
551 /**
552 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
553 * @inode: inode of the file used
554 * @offset: file offset to start truncating
555 *
556 * This is a copy of the common vmtruncate, but with the locking
557 * corrected to take into account the fact that NFS requires
558 * inode->i_size to be updated under the inode->i_lock.
559 * Note: must be called with inode->i_lock held!
560 */
561 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
562 {
563 int err;
564
565 err = inode_newsize_ok(inode, offset);
566 if (err)
567 goto out;
568
569 i_size_write(inode, offset);
570 /* Optimisation */
571 if (offset == 0)
572 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
573
574 spin_unlock(&inode->i_lock);
575 truncate_pagecache(inode, offset);
576 spin_lock(&inode->i_lock);
577 out:
578 return err;
579 }
580
581 /**
582 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
583 * @inode: pointer to struct inode
584 * @attr: pointer to struct iattr
585 *
586 * Note: we do this in the *proc.c in order to ensure that
587 * it works for things like exclusive creates too.
588 */
589 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
590 struct nfs_fattr *fattr)
591 {
592 /* Barrier: bump the attribute generation count. */
593 nfs_fattr_set_barrier(fattr);
594
595 spin_lock(&inode->i_lock);
596 NFS_I(inode)->attr_gencount = fattr->gencount;
597 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
598 if ((attr->ia_valid & ATTR_MODE) != 0) {
599 int mode = attr->ia_mode & S_IALLUGO;
600 mode |= inode->i_mode & ~S_IALLUGO;
601 inode->i_mode = mode;
602 }
603 if ((attr->ia_valid & ATTR_UID) != 0)
604 inode->i_uid = attr->ia_uid;
605 if ((attr->ia_valid & ATTR_GID) != 0)
606 inode->i_gid = attr->ia_gid;
607 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
608 | NFS_INO_INVALID_ACL);
609 }
610 if ((attr->ia_valid & ATTR_SIZE) != 0) {
611 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
612 nfs_vmtruncate(inode, attr->ia_size);
613 }
614 nfs_update_inode(inode, fattr);
615 spin_unlock(&inode->i_lock);
616 }
617 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
618
619 static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
620 {
621 struct dentry *parent;
622
623 parent = dget_parent(dentry);
624 nfs_force_use_readdirplus(parent->d_inode);
625 dput(parent);
626 }
627
628 static bool nfs_need_revalidate_inode(struct inode *inode)
629 {
630 if (NFS_I(inode)->cache_validity &
631 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
632 return true;
633 if (nfs_attribute_cache_expired(inode))
634 return true;
635 return false;
636 }
637
638 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
639 {
640 struct inode *inode = dentry->d_inode;
641 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
642 int err = 0;
643
644 trace_nfs_getattr_enter(inode);
645 /* Flush out writes to the server in order to update c/mtime. */
646 if (S_ISREG(inode->i_mode)) {
647 nfs_inode_dio_wait(inode);
648 err = filemap_write_and_wait(inode->i_mapping);
649 if (err)
650 goto out;
651 }
652
653 /*
654 * We may force a getattr if the user cares about atime.
655 *
656 * Note that we only have to check the vfsmount flags here:
657 * - NFS always sets S_NOATIME by so checking it would give a
658 * bogus result
659 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
660 * no point in checking those.
661 */
662 if ((mnt->mnt_flags & MNT_NOATIME) ||
663 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
664 need_atime = 0;
665
666 if (need_atime || nfs_need_revalidate_inode(inode)) {
667 struct nfs_server *server = NFS_SERVER(inode);
668
669 if (server->caps & NFS_CAP_READDIRPLUS)
670 nfs_request_parent_use_readdirplus(dentry);
671 err = __nfs_revalidate_inode(server, inode);
672 }
673 if (!err) {
674 generic_fillattr(inode, stat);
675 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
676 }
677 out:
678 trace_nfs_getattr_exit(inode, err);
679 return err;
680 }
681 EXPORT_SYMBOL_GPL(nfs_getattr);
682
683 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
684 {
685 atomic_set(&l_ctx->count, 1);
686 l_ctx->lockowner.l_owner = current->files;
687 l_ctx->lockowner.l_pid = current->tgid;
688 INIT_LIST_HEAD(&l_ctx->list);
689 nfs_iocounter_init(&l_ctx->io_count);
690 }
691
692 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
693 {
694 struct nfs_lock_context *head = &ctx->lock_context;
695 struct nfs_lock_context *pos = head;
696
697 do {
698 if (pos->lockowner.l_owner != current->files)
699 continue;
700 if (pos->lockowner.l_pid != current->tgid)
701 continue;
702 atomic_inc(&pos->count);
703 return pos;
704 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
705 return NULL;
706 }
707
708 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
709 {
710 struct nfs_lock_context *res, *new = NULL;
711 struct inode *inode = ctx->dentry->d_inode;
712
713 spin_lock(&inode->i_lock);
714 res = __nfs_find_lock_context(ctx);
715 if (res == NULL) {
716 spin_unlock(&inode->i_lock);
717 new = kmalloc(sizeof(*new), GFP_KERNEL);
718 if (new == NULL)
719 return ERR_PTR(-ENOMEM);
720 nfs_init_lock_context(new);
721 spin_lock(&inode->i_lock);
722 res = __nfs_find_lock_context(ctx);
723 if (res == NULL) {
724 list_add_tail(&new->list, &ctx->lock_context.list);
725 new->open_context = ctx;
726 res = new;
727 new = NULL;
728 }
729 }
730 spin_unlock(&inode->i_lock);
731 kfree(new);
732 return res;
733 }
734 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
735
736 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
737 {
738 struct nfs_open_context *ctx = l_ctx->open_context;
739 struct inode *inode = ctx->dentry->d_inode;
740
741 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
742 return;
743 list_del(&l_ctx->list);
744 spin_unlock(&inode->i_lock);
745 kfree(l_ctx);
746 }
747 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
748
749 /**
750 * nfs_close_context - Common close_context() routine NFSv2/v3
751 * @ctx: pointer to context
752 * @is_sync: is this a synchronous close
753 *
754 * always ensure that the attributes are up to date if we're mounted
755 * with close-to-open semantics
756 */
757 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
758 {
759 struct inode *inode;
760 struct nfs_server *server;
761
762 if (!(ctx->mode & FMODE_WRITE))
763 return;
764 if (!is_sync)
765 return;
766 inode = ctx->dentry->d_inode;
767 if (!list_empty(&NFS_I(inode)->open_files))
768 return;
769 server = NFS_SERVER(inode);
770 if (server->flags & NFS_MOUNT_NOCTO)
771 return;
772 nfs_revalidate_inode(server, inode);
773 }
774 EXPORT_SYMBOL_GPL(nfs_close_context);
775
776 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
777 {
778 struct nfs_open_context *ctx;
779 struct rpc_cred *cred = rpc_lookup_cred();
780 if (IS_ERR(cred))
781 return ERR_CAST(cred);
782
783 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
784 if (!ctx) {
785 put_rpccred(cred);
786 return ERR_PTR(-ENOMEM);
787 }
788 nfs_sb_active(dentry->d_sb);
789 ctx->dentry = dget(dentry);
790 ctx->cred = cred;
791 ctx->state = NULL;
792 ctx->mode = f_mode;
793 ctx->flags = 0;
794 ctx->error = 0;
795 nfs_init_lock_context(&ctx->lock_context);
796 ctx->lock_context.open_context = ctx;
797 INIT_LIST_HEAD(&ctx->list);
798 ctx->mdsthreshold = NULL;
799 return ctx;
800 }
801 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
802
803 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
804 {
805 if (ctx != NULL)
806 atomic_inc(&ctx->lock_context.count);
807 return ctx;
808 }
809 EXPORT_SYMBOL_GPL(get_nfs_open_context);
810
811 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
812 {
813 struct inode *inode = ctx->dentry->d_inode;
814 struct super_block *sb = ctx->dentry->d_sb;
815
816 if (!list_empty(&ctx->list)) {
817 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
818 return;
819 list_del(&ctx->list);
820 spin_unlock(&inode->i_lock);
821 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
822 return;
823 if (inode != NULL)
824 NFS_PROTO(inode)->close_context(ctx, is_sync);
825 if (ctx->cred != NULL)
826 put_rpccred(ctx->cred);
827 dput(ctx->dentry);
828 nfs_sb_deactive(sb);
829 kfree(ctx->mdsthreshold);
830 kfree(ctx);
831 }
832
833 void put_nfs_open_context(struct nfs_open_context *ctx)
834 {
835 __put_nfs_open_context(ctx, 0);
836 }
837 EXPORT_SYMBOL_GPL(put_nfs_open_context);
838
839 /*
840 * Ensure that mmap has a recent RPC credential for use when writing out
841 * shared pages
842 */
843 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
844 {
845 struct inode *inode = ctx->dentry->d_inode;
846 struct nfs_inode *nfsi = NFS_I(inode);
847
848 spin_lock(&inode->i_lock);
849 list_add(&ctx->list, &nfsi->open_files);
850 spin_unlock(&inode->i_lock);
851 }
852 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
853
854 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
855 {
856 filp->private_data = get_nfs_open_context(ctx);
857 if (list_empty(&ctx->list))
858 nfs_inode_attach_open_context(ctx);
859 }
860 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
861
862 /*
863 * Given an inode, search for an open context with the desired characteristics
864 */
865 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
866 {
867 struct nfs_inode *nfsi = NFS_I(inode);
868 struct nfs_open_context *pos, *ctx = NULL;
869
870 spin_lock(&inode->i_lock);
871 list_for_each_entry(pos, &nfsi->open_files, list) {
872 if (cred != NULL && pos->cred != cred)
873 continue;
874 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
875 continue;
876 ctx = get_nfs_open_context(pos);
877 break;
878 }
879 spin_unlock(&inode->i_lock);
880 return ctx;
881 }
882
883 static void nfs_file_clear_open_context(struct file *filp)
884 {
885 struct nfs_open_context *ctx = nfs_file_open_context(filp);
886
887 if (ctx) {
888 struct inode *inode = ctx->dentry->d_inode;
889
890 filp->private_data = NULL;
891 spin_lock(&inode->i_lock);
892 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
893 spin_unlock(&inode->i_lock);
894 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
895 }
896 }
897
898 /*
899 * These allocate and release file read/write context information.
900 */
901 int nfs_open(struct inode *inode, struct file *filp)
902 {
903 struct nfs_open_context *ctx;
904
905 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
906 if (IS_ERR(ctx))
907 return PTR_ERR(ctx);
908 nfs_file_set_open_context(filp, ctx);
909 put_nfs_open_context(ctx);
910 nfs_fscache_open_file(inode, filp);
911 return 0;
912 }
913
914 int nfs_release(struct inode *inode, struct file *filp)
915 {
916 nfs_file_clear_open_context(filp);
917 return 0;
918 }
919
920 /*
921 * This function is called whenever some part of NFS notices that
922 * the cached attributes have to be refreshed.
923 */
924 int
925 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
926 {
927 int status = -ESTALE;
928 struct nfs4_label *label = NULL;
929 struct nfs_fattr *fattr = NULL;
930 struct nfs_inode *nfsi = NFS_I(inode);
931
932 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
933 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
934
935 trace_nfs_revalidate_inode_enter(inode);
936
937 if (is_bad_inode(inode))
938 goto out;
939 if (NFS_STALE(inode))
940 goto out;
941
942 status = -ENOMEM;
943 fattr = nfs_alloc_fattr();
944 if (fattr == NULL)
945 goto out;
946
947 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
948
949 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
950 if (IS_ERR(label)) {
951 status = PTR_ERR(label);
952 goto out;
953 }
954
955 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
956 if (status != 0) {
957 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
958 inode->i_sb->s_id,
959 (unsigned long long)NFS_FILEID(inode), status);
960 if (status == -ESTALE) {
961 nfs_zap_caches(inode);
962 if (!S_ISDIR(inode->i_mode))
963 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
964 }
965 goto err_out;
966 }
967
968 status = nfs_refresh_inode(inode, fattr);
969 if (status) {
970 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
971 inode->i_sb->s_id,
972 (unsigned long long)NFS_FILEID(inode), status);
973 goto err_out;
974 }
975
976 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
977 nfs_zap_acl_cache(inode);
978
979 nfs_setsecurity(inode, fattr, label);
980
981 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
982 inode->i_sb->s_id,
983 (unsigned long long)NFS_FILEID(inode));
984
985 err_out:
986 nfs4_label_free(label);
987 out:
988 nfs_free_fattr(fattr);
989 trace_nfs_revalidate_inode_exit(inode, status);
990 return status;
991 }
992
993 int nfs_attribute_timeout(struct inode *inode)
994 {
995 struct nfs_inode *nfsi = NFS_I(inode);
996
997 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
998 }
999
1000 int nfs_attribute_cache_expired(struct inode *inode)
1001 {
1002 if (nfs_have_delegated_attributes(inode))
1003 return 0;
1004 return nfs_attribute_timeout(inode);
1005 }
1006
1007 /**
1008 * nfs_revalidate_inode - Revalidate the inode attributes
1009 * @server - pointer to nfs_server struct
1010 * @inode - pointer to inode struct
1011 *
1012 * Updates inode attribute information by retrieving the data from the server.
1013 */
1014 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1015 {
1016 if (!nfs_need_revalidate_inode(inode))
1017 return NFS_STALE(inode) ? -ESTALE : 0;
1018 return __nfs_revalidate_inode(server, inode);
1019 }
1020 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1021
1022 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode)
1023 {
1024 if (!(NFS_I(inode)->cache_validity &
1025 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
1026 && !nfs_attribute_cache_expired(inode))
1027 return NFS_STALE(inode) ? -ESTALE : 0;
1028 return -ECHILD;
1029 }
1030
1031 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1032 {
1033 struct nfs_inode *nfsi = NFS_I(inode);
1034 int ret;
1035
1036 if (mapping->nrpages != 0) {
1037 if (S_ISREG(inode->i_mode)) {
1038 ret = nfs_sync_mapping(mapping);
1039 if (ret < 0)
1040 return ret;
1041 }
1042 ret = invalidate_inode_pages2(mapping);
1043 if (ret < 0)
1044 return ret;
1045 }
1046 if (S_ISDIR(inode->i_mode)) {
1047 spin_lock(&inode->i_lock);
1048 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1049 spin_unlock(&inode->i_lock);
1050 }
1051 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1052 nfs_fscache_wait_on_invalidate(inode);
1053
1054 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1055 inode->i_sb->s_id,
1056 (unsigned long long)NFS_FILEID(inode));
1057 return 0;
1058 }
1059
1060 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1061 {
1062 if (nfs_have_delegated_attributes(inode))
1063 return false;
1064 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1065 || nfs_attribute_timeout(inode)
1066 || NFS_STALE(inode);
1067 }
1068
1069 /**
1070 * nfs_revalidate_mapping - Revalidate the pagecache
1071 * @inode - pointer to host inode
1072 * @mapping - pointer to mapping
1073 */
1074 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1075 {
1076 struct nfs_inode *nfsi = NFS_I(inode);
1077 unsigned long *bitlock = &nfsi->flags;
1078 int ret = 0;
1079
1080 /* swapfiles are not supposed to be shared. */
1081 if (IS_SWAPFILE(inode))
1082 goto out;
1083
1084 if (nfs_mapping_need_revalidate_inode(inode)) {
1085 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1086 if (ret < 0)
1087 goto out;
1088 }
1089
1090 /*
1091 * We must clear NFS_INO_INVALID_DATA first to ensure that
1092 * invalidations that come in while we're shooting down the mappings
1093 * are respected. But, that leaves a race window where one revalidator
1094 * can clear the flag, and then another checks it before the mapping
1095 * gets invalidated. Fix that by serializing access to this part of
1096 * the function.
1097 *
1098 * At the same time, we need to allow other tasks to see whether we
1099 * might be in the middle of invalidating the pages, so we only set
1100 * the bit lock here if it looks like we're going to be doing that.
1101 */
1102 for (;;) {
1103 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1104 nfs_wait_bit_killable, TASK_KILLABLE);
1105 if (ret)
1106 goto out;
1107 spin_lock(&inode->i_lock);
1108 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1109 spin_unlock(&inode->i_lock);
1110 continue;
1111 }
1112 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1113 break;
1114 spin_unlock(&inode->i_lock);
1115 goto out;
1116 }
1117
1118 set_bit(NFS_INO_INVALIDATING, bitlock);
1119 smp_wmb();
1120 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1121 spin_unlock(&inode->i_lock);
1122 trace_nfs_invalidate_mapping_enter(inode);
1123 ret = nfs_invalidate_mapping(inode, mapping);
1124 trace_nfs_invalidate_mapping_exit(inode, ret);
1125
1126 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1127 smp_mb__after_atomic();
1128 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1129 out:
1130 return ret;
1131 }
1132
1133 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1134 {
1135 struct nfs_inode *nfsi = NFS_I(inode);
1136 unsigned long ret = 0;
1137
1138 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1139 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1140 && inode->i_version == fattr->pre_change_attr) {
1141 inode->i_version = fattr->change_attr;
1142 if (S_ISDIR(inode->i_mode))
1143 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1144 ret |= NFS_INO_INVALID_ATTR;
1145 }
1146 /* If we have atomic WCC data, we may update some attributes */
1147 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1148 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1149 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1150 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1151 ret |= NFS_INO_INVALID_ATTR;
1152 }
1153
1154 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1155 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1156 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1157 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1158 if (S_ISDIR(inode->i_mode))
1159 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1160 ret |= NFS_INO_INVALID_ATTR;
1161 }
1162 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1163 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1164 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1165 && nfsi->nrequests == 0) {
1166 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1167 ret |= NFS_INO_INVALID_ATTR;
1168 }
1169
1170 return ret;
1171 }
1172
1173 /**
1174 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1175 * @inode - pointer to inode
1176 * @fattr - updated attributes
1177 *
1178 * Verifies the attribute cache. If we have just changed the attributes,
1179 * so that fattr carries weak cache consistency data, then it may
1180 * also update the ctime/mtime/change_attribute.
1181 */
1182 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1183 {
1184 struct nfs_inode *nfsi = NFS_I(inode);
1185 loff_t cur_size, new_isize;
1186 unsigned long invalid = 0;
1187
1188
1189 if (nfs_have_delegated_attributes(inode))
1190 return 0;
1191 /* Has the inode gone and changed behind our back? */
1192 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1193 return -EIO;
1194 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1195 return -EIO;
1196
1197 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1198 inode->i_version != fattr->change_attr)
1199 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1200
1201 /* Verify a few of the more important attributes */
1202 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1203 invalid |= NFS_INO_INVALID_ATTR;
1204
1205 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1206 cur_size = i_size_read(inode);
1207 new_isize = nfs_size_to_loff_t(fattr->size);
1208 if (cur_size != new_isize && nfsi->nrequests == 0)
1209 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1210 }
1211
1212 /* Have any file permissions changed? */
1213 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1214 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1215 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1216 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1217 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1218 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1219
1220 /* Has the link count changed? */
1221 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1222 invalid |= NFS_INO_INVALID_ATTR;
1223
1224 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1225 invalid |= NFS_INO_INVALID_ATIME;
1226
1227 if (invalid != 0)
1228 nfs_set_cache_invalid(inode, invalid);
1229
1230 nfsi->read_cache_jiffies = fattr->time_start;
1231 return 0;
1232 }
1233
1234 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1235 {
1236 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1237 return 0;
1238 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1239 }
1240
1241 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1242 {
1243 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1244 return 0;
1245 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1246 }
1247
1248 static atomic_long_t nfs_attr_generation_counter;
1249
1250 static unsigned long nfs_read_attr_generation_counter(void)
1251 {
1252 return atomic_long_read(&nfs_attr_generation_counter);
1253 }
1254
1255 unsigned long nfs_inc_attr_generation_counter(void)
1256 {
1257 return atomic_long_inc_return(&nfs_attr_generation_counter);
1258 }
1259
1260 void nfs_fattr_init(struct nfs_fattr *fattr)
1261 {
1262 fattr->valid = 0;
1263 fattr->time_start = jiffies;
1264 fattr->gencount = nfs_inc_attr_generation_counter();
1265 fattr->owner_name = NULL;
1266 fattr->group_name = NULL;
1267 }
1268 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1269
1270 /**
1271 * nfs_fattr_set_barrier
1272 * @fattr: attributes
1273 *
1274 * Used to set a barrier after an attribute was updated. This
1275 * barrier ensures that older attributes from RPC calls that may
1276 * have raced with our update cannot clobber these new values.
1277 * Note that you are still responsible for ensuring that other
1278 * operations which change the attribute on the server do not
1279 * collide.
1280 */
1281 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1282 {
1283 fattr->gencount = nfs_inc_attr_generation_counter();
1284 }
1285
1286 struct nfs_fattr *nfs_alloc_fattr(void)
1287 {
1288 struct nfs_fattr *fattr;
1289
1290 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1291 if (fattr != NULL)
1292 nfs_fattr_init(fattr);
1293 return fattr;
1294 }
1295 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1296
1297 struct nfs_fh *nfs_alloc_fhandle(void)
1298 {
1299 struct nfs_fh *fh;
1300
1301 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1302 if (fh != NULL)
1303 fh->size = 0;
1304 return fh;
1305 }
1306 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1307
1308 #ifdef NFS_DEBUG
1309 /*
1310 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1311 * in the same way that wireshark does
1312 *
1313 * @fh: file handle
1314 *
1315 * For debugging only.
1316 */
1317 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1318 {
1319 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1320 * not on the result */
1321 return nfs_fhandle_hash(fh);
1322 }
1323 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1324
1325 /*
1326 * _nfs_display_fhandle - display an NFS file handle on the console
1327 *
1328 * @fh: file handle to display
1329 * @caption: display caption
1330 *
1331 * For debugging only.
1332 */
1333 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1334 {
1335 unsigned short i;
1336
1337 if (fh == NULL || fh->size == 0) {
1338 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1339 return;
1340 }
1341
1342 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1343 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1344 for (i = 0; i < fh->size; i += 16) {
1345 __be32 *pos = (__be32 *)&fh->data[i];
1346
1347 switch ((fh->size - i - 1) >> 2) {
1348 case 0:
1349 printk(KERN_DEFAULT " %08x\n",
1350 be32_to_cpup(pos));
1351 break;
1352 case 1:
1353 printk(KERN_DEFAULT " %08x %08x\n",
1354 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1355 break;
1356 case 2:
1357 printk(KERN_DEFAULT " %08x %08x %08x\n",
1358 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1359 be32_to_cpup(pos + 2));
1360 break;
1361 default:
1362 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1363 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1364 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1365 }
1366 }
1367 }
1368 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1369 #endif
1370
1371 /**
1372 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1373 * @inode - pointer to inode
1374 * @fattr - attributes
1375 *
1376 * Attempt to divine whether or not an RPC call reply carrying stale
1377 * attributes got scheduled after another call carrying updated ones.
1378 *
1379 * To do so, the function first assumes that a more recent ctime means
1380 * that the attributes in fattr are newer, however it also attempt to
1381 * catch the case where ctime either didn't change, or went backwards
1382 * (if someone reset the clock on the server) by looking at whether
1383 * or not this RPC call was started after the inode was last updated.
1384 * Note also the check for wraparound of 'attr_gencount'
1385 *
1386 * The function returns 'true' if it thinks the attributes in 'fattr' are
1387 * more recent than the ones cached in the inode.
1388 *
1389 */
1390 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1391 {
1392 const struct nfs_inode *nfsi = NFS_I(inode);
1393
1394 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1395 nfs_ctime_need_update(inode, fattr) ||
1396 nfs_size_need_update(inode, fattr) ||
1397 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1398 }
1399
1400 /*
1401 * Don't trust the change_attribute, mtime, ctime or size if
1402 * a pnfs LAYOUTCOMMIT is outstanding
1403 */
1404 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1405 struct nfs_fattr *fattr)
1406 {
1407 if (pnfs_layoutcommit_outstanding(inode))
1408 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1409 NFS_ATTR_FATTR_MTIME |
1410 NFS_ATTR_FATTR_CTIME |
1411 NFS_ATTR_FATTR_SIZE);
1412 }
1413
1414 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1415 {
1416 int ret;
1417
1418 trace_nfs_refresh_inode_enter(inode);
1419
1420 nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1421
1422 if (nfs_inode_attrs_need_update(inode, fattr))
1423 ret = nfs_update_inode(inode, fattr);
1424 else
1425 ret = nfs_check_inode_attributes(inode, fattr);
1426
1427 trace_nfs_refresh_inode_exit(inode, ret);
1428 return ret;
1429 }
1430
1431 /**
1432 * nfs_refresh_inode - try to update the inode attribute cache
1433 * @inode - pointer to inode
1434 * @fattr - updated attributes
1435 *
1436 * Check that an RPC call that returned attributes has not overlapped with
1437 * other recent updates of the inode metadata, then decide whether it is
1438 * safe to do a full update of the inode attributes, or whether just to
1439 * call nfs_check_inode_attributes.
1440 */
1441 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1442 {
1443 int status;
1444
1445 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1446 return 0;
1447 spin_lock(&inode->i_lock);
1448 status = nfs_refresh_inode_locked(inode, fattr);
1449 spin_unlock(&inode->i_lock);
1450
1451 return status;
1452 }
1453 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1454
1455 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1456 {
1457 unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1458
1459 if (S_ISDIR(inode->i_mode))
1460 invalid |= NFS_INO_INVALID_DATA;
1461 nfs_set_cache_invalid(inode, invalid);
1462 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1463 return 0;
1464 return nfs_refresh_inode_locked(inode, fattr);
1465 }
1466
1467 /**
1468 * nfs_post_op_update_inode - try to update the inode attribute cache
1469 * @inode - pointer to inode
1470 * @fattr - updated attributes
1471 *
1472 * After an operation that has changed the inode metadata, mark the
1473 * attribute cache as being invalid, then try to update it.
1474 *
1475 * NB: if the server didn't return any post op attributes, this
1476 * function will force the retrieval of attributes before the next
1477 * NFS request. Thus it should be used only for operations that
1478 * are expected to change one or more attributes, to avoid
1479 * unnecessary NFS requests and trips through nfs_update_inode().
1480 */
1481 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1482 {
1483 int status;
1484
1485 spin_lock(&inode->i_lock);
1486 status = nfs_post_op_update_inode_locked(inode, fattr);
1487 spin_unlock(&inode->i_lock);
1488
1489 return status;
1490 }
1491 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1492
1493 /**
1494 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1495 * @inode - pointer to inode
1496 * @fattr - updated attributes
1497 *
1498 * After an operation that has changed the inode metadata, mark the
1499 * attribute cache as being invalid, then try to update it. Fake up
1500 * weak cache consistency data, if none exist.
1501 *
1502 * This function is mainly designed to be used by the ->write_done() functions.
1503 */
1504 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1505 {
1506 int status;
1507
1508 /* Don't do a WCC update if these attributes are already stale */
1509 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1510 !nfs_inode_attrs_need_update(inode, fattr)) {
1511 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1512 | NFS_ATTR_FATTR_PRESIZE
1513 | NFS_ATTR_FATTR_PREMTIME
1514 | NFS_ATTR_FATTR_PRECTIME);
1515 goto out_noforce;
1516 }
1517 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1518 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1519 fattr->pre_change_attr = inode->i_version;
1520 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1521 }
1522 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1523 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1524 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1525 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1526 }
1527 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1528 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1529 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1530 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1531 }
1532 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1533 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1534 fattr->pre_size = i_size_read(inode);
1535 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1536 }
1537 out_noforce:
1538 status = nfs_post_op_update_inode_locked(inode, fattr);
1539 return status;
1540 }
1541
1542 /**
1543 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1544 * @inode - pointer to inode
1545 * @fattr - updated attributes
1546 *
1547 * After an operation that has changed the inode metadata, mark the
1548 * attribute cache as being invalid, then try to update it. Fake up
1549 * weak cache consistency data, if none exist.
1550 *
1551 * This function is mainly designed to be used by the ->write_done() functions.
1552 */
1553 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1554 {
1555 int status;
1556
1557 spin_lock(&inode->i_lock);
1558 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1559 spin_unlock(&inode->i_lock);
1560 return status;
1561 }
1562 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1563
1564 /*
1565 * Many nfs protocol calls return the new file attributes after
1566 * an operation. Here we update the inode to reflect the state
1567 * of the server's inode.
1568 *
1569 * This is a bit tricky because we have to make sure all dirty pages
1570 * have been sent off to the server before calling invalidate_inode_pages.
1571 * To make sure no other process adds more write requests while we try
1572 * our best to flush them, we make them sleep during the attribute refresh.
1573 *
1574 * A very similar scenario holds for the dir cache.
1575 */
1576 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1577 {
1578 struct nfs_server *server;
1579 struct nfs_inode *nfsi = NFS_I(inode);
1580 loff_t cur_isize, new_isize;
1581 unsigned long invalid = 0;
1582 unsigned long now = jiffies;
1583 unsigned long save_cache_validity;
1584
1585 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1586 __func__, inode->i_sb->s_id, inode->i_ino,
1587 nfs_display_fhandle_hash(NFS_FH(inode)),
1588 atomic_read(&inode->i_count), fattr->valid);
1589
1590 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1591 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1592 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1593 NFS_SERVER(inode)->nfs_client->cl_hostname,
1594 inode->i_sb->s_id, (long long)nfsi->fileid,
1595 (long long)fattr->fileid);
1596 goto out_err;
1597 }
1598
1599 /*
1600 * Make sure the inode's type hasn't changed.
1601 */
1602 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1603 /*
1604 * Big trouble! The inode has become a different object.
1605 */
1606 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1607 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1608 goto out_err;
1609 }
1610
1611 server = NFS_SERVER(inode);
1612 /* Update the fsid? */
1613 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1614 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1615 !IS_AUTOMOUNT(inode))
1616 server->fsid = fattr->fsid;
1617
1618 /*
1619 * Update the read time so we don't revalidate too often.
1620 */
1621 nfsi->read_cache_jiffies = fattr->time_start;
1622
1623 save_cache_validity = nfsi->cache_validity;
1624 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1625 | NFS_INO_INVALID_ATIME
1626 | NFS_INO_REVAL_FORCED
1627 | NFS_INO_REVAL_PAGECACHE);
1628
1629 /* Do atomic weak cache consistency updates */
1630 invalid |= nfs_wcc_update_inode(inode, fattr);
1631
1632 /* More cache consistency checks */
1633 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1634 if (inode->i_version != fattr->change_attr) {
1635 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1636 inode->i_sb->s_id, inode->i_ino);
1637 invalid |= NFS_INO_INVALID_ATTR
1638 | NFS_INO_INVALID_DATA
1639 | NFS_INO_INVALID_ACCESS
1640 | NFS_INO_INVALID_ACL
1641 | NFS_INO_REVAL_PAGECACHE;
1642 if (S_ISDIR(inode->i_mode))
1643 nfs_force_lookup_revalidate(inode);
1644 inode->i_version = fattr->change_attr;
1645 }
1646 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1647 nfsi->cache_validity |= save_cache_validity;
1648
1649 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1650 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1651 } else if (server->caps & NFS_CAP_MTIME)
1652 nfsi->cache_validity |= save_cache_validity &
1653 (NFS_INO_INVALID_ATTR
1654 | NFS_INO_REVAL_FORCED);
1655
1656 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1657 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1658 } else if (server->caps & NFS_CAP_CTIME)
1659 nfsi->cache_validity |= save_cache_validity &
1660 (NFS_INO_INVALID_ATTR
1661 | NFS_INO_REVAL_FORCED);
1662
1663 /* Check if our cached file size is stale */
1664 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1665 new_isize = nfs_size_to_loff_t(fattr->size);
1666 cur_isize = i_size_read(inode);
1667 if (new_isize != cur_isize) {
1668 /* Do we perhaps have any outstanding writes, or has
1669 * the file grown beyond our last write? */
1670 if ((nfsi->nrequests == 0) || new_isize > cur_isize) {
1671 i_size_write(inode, new_isize);
1672 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1673 invalid &= ~NFS_INO_REVAL_PAGECACHE;
1674 }
1675 dprintk("NFS: isize change on server for file %s/%ld "
1676 "(%Ld to %Ld)\n",
1677 inode->i_sb->s_id,
1678 inode->i_ino,
1679 (long long)cur_isize,
1680 (long long)new_isize);
1681 }
1682 } else
1683 nfsi->cache_validity |= save_cache_validity &
1684 (NFS_INO_INVALID_ATTR
1685 | NFS_INO_REVAL_PAGECACHE
1686 | NFS_INO_REVAL_FORCED);
1687
1688
1689 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1690 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1691 else if (server->caps & NFS_CAP_ATIME)
1692 nfsi->cache_validity |= save_cache_validity &
1693 (NFS_INO_INVALID_ATIME
1694 | NFS_INO_REVAL_FORCED);
1695
1696 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1697 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1698 umode_t newmode = inode->i_mode & S_IFMT;
1699 newmode |= fattr->mode & S_IALLUGO;
1700 inode->i_mode = newmode;
1701 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1702 }
1703 } else if (server->caps & NFS_CAP_MODE)
1704 nfsi->cache_validity |= save_cache_validity &
1705 (NFS_INO_INVALID_ATTR
1706 | NFS_INO_INVALID_ACCESS
1707 | NFS_INO_INVALID_ACL
1708 | NFS_INO_REVAL_FORCED);
1709
1710 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1711 if (!uid_eq(inode->i_uid, fattr->uid)) {
1712 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1713 inode->i_uid = fattr->uid;
1714 }
1715 } else if (server->caps & NFS_CAP_OWNER)
1716 nfsi->cache_validity |= save_cache_validity &
1717 (NFS_INO_INVALID_ATTR
1718 | NFS_INO_INVALID_ACCESS
1719 | NFS_INO_INVALID_ACL
1720 | NFS_INO_REVAL_FORCED);
1721
1722 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1723 if (!gid_eq(inode->i_gid, fattr->gid)) {
1724 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1725 inode->i_gid = fattr->gid;
1726 }
1727 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1728 nfsi->cache_validity |= save_cache_validity &
1729 (NFS_INO_INVALID_ATTR
1730 | NFS_INO_INVALID_ACCESS
1731 | NFS_INO_INVALID_ACL
1732 | NFS_INO_REVAL_FORCED);
1733
1734 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1735 if (inode->i_nlink != fattr->nlink) {
1736 invalid |= NFS_INO_INVALID_ATTR;
1737 if (S_ISDIR(inode->i_mode))
1738 invalid |= NFS_INO_INVALID_DATA;
1739 set_nlink(inode, fattr->nlink);
1740 }
1741 } else if (server->caps & NFS_CAP_NLINK)
1742 nfsi->cache_validity |= save_cache_validity &
1743 (NFS_INO_INVALID_ATTR
1744 | NFS_INO_REVAL_FORCED);
1745
1746 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1747 /*
1748 * report the blocks in 512byte units
1749 */
1750 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1751 }
1752 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1753 inode->i_blocks = fattr->du.nfs2.blocks;
1754
1755 /* Update attrtimeo value if we're out of the unstable period */
1756 if (invalid & NFS_INO_INVALID_ATTR) {
1757 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1758 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1759 nfsi->attrtimeo_timestamp = now;
1760 /* Set barrier to be more recent than all outstanding updates */
1761 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1762 } else {
1763 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1764 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1765 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1766 nfsi->attrtimeo_timestamp = now;
1767 }
1768 /* Set the barrier to be more recent than this fattr */
1769 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1770 nfsi->attr_gencount = fattr->gencount;
1771 }
1772 invalid &= ~NFS_INO_INVALID_ATTR;
1773 /* Don't invalidate the data if we were to blame */
1774 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1775 || S_ISLNK(inode->i_mode)))
1776 invalid &= ~NFS_INO_INVALID_DATA;
1777 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1778 (save_cache_validity & NFS_INO_REVAL_FORCED))
1779 nfs_set_cache_invalid(inode, invalid);
1780
1781 return 0;
1782 out_err:
1783 /*
1784 * No need to worry about unhashing the dentry, as the
1785 * lookup validation will know that the inode is bad.
1786 * (But we fall through to invalidate the caches.)
1787 */
1788 nfs_invalidate_inode(inode);
1789 return -ESTALE;
1790 }
1791
1792 struct inode *nfs_alloc_inode(struct super_block *sb)
1793 {
1794 struct nfs_inode *nfsi;
1795 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1796 if (!nfsi)
1797 return NULL;
1798 nfsi->flags = 0UL;
1799 nfsi->cache_validity = 0UL;
1800 #if IS_ENABLED(CONFIG_NFS_V4)
1801 nfsi->nfs4_acl = NULL;
1802 #endif /* CONFIG_NFS_V4 */
1803 return &nfsi->vfs_inode;
1804 }
1805 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1806
1807 static void nfs_i_callback(struct rcu_head *head)
1808 {
1809 struct inode *inode = container_of(head, struct inode, i_rcu);
1810 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1811 }
1812
1813 void nfs_destroy_inode(struct inode *inode)
1814 {
1815 call_rcu(&inode->i_rcu, nfs_i_callback);
1816 }
1817 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1818
1819 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1820 {
1821 #if IS_ENABLED(CONFIG_NFS_V4)
1822 INIT_LIST_HEAD(&nfsi->open_states);
1823 nfsi->delegation = NULL;
1824 init_rwsem(&nfsi->rwsem);
1825 nfsi->layout = NULL;
1826 #endif
1827 }
1828
1829 static void init_once(void *foo)
1830 {
1831 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1832
1833 inode_init_once(&nfsi->vfs_inode);
1834 INIT_LIST_HEAD(&nfsi->open_files);
1835 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1836 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1837 INIT_LIST_HEAD(&nfsi->commit_info.list);
1838 nfsi->nrequests = 0;
1839 nfsi->commit_info.ncommit = 0;
1840 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1841 atomic_set(&nfsi->silly_count, 1);
1842 INIT_HLIST_HEAD(&nfsi->silly_list);
1843 init_waitqueue_head(&nfsi->waitqueue);
1844 nfs4_init_once(nfsi);
1845 }
1846
1847 static int __init nfs_init_inodecache(void)
1848 {
1849 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1850 sizeof(struct nfs_inode),
1851 0, (SLAB_RECLAIM_ACCOUNT|
1852 SLAB_MEM_SPREAD),
1853 init_once);
1854 if (nfs_inode_cachep == NULL)
1855 return -ENOMEM;
1856
1857 return 0;
1858 }
1859
1860 static void nfs_destroy_inodecache(void)
1861 {
1862 /*
1863 * Make sure all delayed rcu free inodes are flushed before we
1864 * destroy cache.
1865 */
1866 rcu_barrier();
1867 kmem_cache_destroy(nfs_inode_cachep);
1868 }
1869
1870 struct workqueue_struct *nfsiod_workqueue;
1871 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1872
1873 /*
1874 * start up the nfsiod workqueue
1875 */
1876 static int nfsiod_start(void)
1877 {
1878 struct workqueue_struct *wq;
1879 dprintk("RPC: creating workqueue nfsiod\n");
1880 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1881 if (wq == NULL)
1882 return -ENOMEM;
1883 nfsiod_workqueue = wq;
1884 return 0;
1885 }
1886
1887 /*
1888 * Destroy the nfsiod workqueue
1889 */
1890 static void nfsiod_stop(void)
1891 {
1892 struct workqueue_struct *wq;
1893
1894 wq = nfsiod_workqueue;
1895 if (wq == NULL)
1896 return;
1897 nfsiod_workqueue = NULL;
1898 destroy_workqueue(wq);
1899 }
1900
1901 int nfs_net_id;
1902 EXPORT_SYMBOL_GPL(nfs_net_id);
1903
1904 static int nfs_net_init(struct net *net)
1905 {
1906 nfs_clients_init(net);
1907 return nfs_fs_proc_net_init(net);
1908 }
1909
1910 static void nfs_net_exit(struct net *net)
1911 {
1912 nfs_fs_proc_net_exit(net);
1913 nfs_cleanup_cb_ident_idr(net);
1914 }
1915
1916 static struct pernet_operations nfs_net_ops = {
1917 .init = nfs_net_init,
1918 .exit = nfs_net_exit,
1919 .id = &nfs_net_id,
1920 .size = sizeof(struct nfs_net),
1921 };
1922
1923 /*
1924 * Initialize NFS
1925 */
1926 static int __init init_nfs_fs(void)
1927 {
1928 int err;
1929
1930 err = register_pernet_subsys(&nfs_net_ops);
1931 if (err < 0)
1932 goto out9;
1933
1934 err = nfs_fscache_register();
1935 if (err < 0)
1936 goto out8;
1937
1938 err = nfsiod_start();
1939 if (err)
1940 goto out7;
1941
1942 err = nfs_fs_proc_init();
1943 if (err)
1944 goto out6;
1945
1946 err = nfs_init_nfspagecache();
1947 if (err)
1948 goto out5;
1949
1950 err = nfs_init_inodecache();
1951 if (err)
1952 goto out4;
1953
1954 err = nfs_init_readpagecache();
1955 if (err)
1956 goto out3;
1957
1958 err = nfs_init_writepagecache();
1959 if (err)
1960 goto out2;
1961
1962 err = nfs_init_directcache();
1963 if (err)
1964 goto out1;
1965
1966 #ifdef CONFIG_PROC_FS
1967 rpc_proc_register(&init_net, &nfs_rpcstat);
1968 #endif
1969 if ((err = register_nfs_fs()) != 0)
1970 goto out0;
1971
1972 return 0;
1973 out0:
1974 #ifdef CONFIG_PROC_FS
1975 rpc_proc_unregister(&init_net, "nfs");
1976 #endif
1977 nfs_destroy_directcache();
1978 out1:
1979 nfs_destroy_writepagecache();
1980 out2:
1981 nfs_destroy_readpagecache();
1982 out3:
1983 nfs_destroy_inodecache();
1984 out4:
1985 nfs_destroy_nfspagecache();
1986 out5:
1987 nfs_fs_proc_exit();
1988 out6:
1989 nfsiod_stop();
1990 out7:
1991 nfs_fscache_unregister();
1992 out8:
1993 unregister_pernet_subsys(&nfs_net_ops);
1994 out9:
1995 return err;
1996 }
1997
1998 static void __exit exit_nfs_fs(void)
1999 {
2000 nfs_destroy_directcache();
2001 nfs_destroy_writepagecache();
2002 nfs_destroy_readpagecache();
2003 nfs_destroy_inodecache();
2004 nfs_destroy_nfspagecache();
2005 nfs_fscache_unregister();
2006 unregister_pernet_subsys(&nfs_net_ops);
2007 #ifdef CONFIG_PROC_FS
2008 rpc_proc_unregister(&init_net, "nfs");
2009 #endif
2010 unregister_nfs_fs();
2011 nfs_fs_proc_exit();
2012 nfsiod_stop();
2013 }
2014
2015 /* Not quite true; I just maintain it */
2016 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2017 MODULE_LICENSE("GPL");
2018 module_param(enable_ino64, bool, 0644);
2019
2020 module_init(init_nfs_fs)
2021 module_exit(exit_nfs_fs)
Linux kernel - Deliverables
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