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nfs41: implement DESTROY_CLIENTID operation
[linux-btrfs-devel.git] / fs / nfs / inode.c
blobfe1203797b2b08a2de481d598c8851657a8b19d3
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/nfs_idmap.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41
42 #include <asm/system.h>
43 #include <asm/uaccess.h>
44
45 #include "nfs4_fs.h"
46 #include "callback.h"
47 #include "delegation.h"
48 #include "iostat.h"
49 #include "internal.h"
50 #include "fscache.h"
51 #include "dns_resolve.h"
52 #include "pnfs.h"
53
54 #define NFSDBG_FACILITY NFSDBG_VFS
55
56 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
57
58 /* Default is to see 64-bit inode numbers */
59 static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
60
61 static void nfs_invalidate_inode(struct inode *);
62 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
63
64 static struct kmem_cache * nfs_inode_cachep;
65
66 static inline unsigned long
67 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
68 {
69 return nfs_fileid_to_ino_t(fattr->fileid);
70 }
71
72 /**
73 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
74 * @word: long word containing the bit lock
75 */
76 int nfs_wait_bit_killable(void *word)
77 {
78 if (fatal_signal_pending(current))
79 return -ERESTARTSYS;
80 schedule();
81 return 0;
82 }
83
84 /**
85 * nfs_compat_user_ino64 - returns the user-visible inode number
86 * @fileid: 64-bit fileid
87 *
88 * This function returns a 32-bit inode number if the boot parameter
89 * nfs.enable_ino64 is zero.
90 */
91 u64 nfs_compat_user_ino64(u64 fileid)
92 {
93 #ifdef CONFIG_COMPAT
94 compat_ulong_t ino;
95 #else
96 unsigned long ino;
97 #endif
98
99 if (enable_ino64)
100 return fileid;
101 ino = fileid;
102 if (sizeof(ino) < sizeof(fileid))
103 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
104 return ino;
105 }
106
107 static void nfs_clear_inode(struct inode *inode)
108 {
109 /*
110 * The following should never happen...
111 */
112 BUG_ON(nfs_have_writebacks(inode));
113 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
114 nfs_zap_acl_cache(inode);
115 nfs_access_zap_cache(inode);
116 nfs_fscache_release_inode_cookie(inode);
117 }
118
119 void nfs_evict_inode(struct inode *inode)
120 {
121 truncate_inode_pages(&inode->i_data, 0);
122 end_writeback(inode);
123 nfs_clear_inode(inode);
124 }
125
126 /**
127 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
128 */
129 int nfs_sync_mapping(struct address_space *mapping)
130 {
131 int ret = 0;
132
133 if (mapping->nrpages != 0) {
134 unmap_mapping_range(mapping, 0, 0, 0);
135 ret = nfs_wb_all(mapping->host);
136 }
137 return ret;
138 }
139
140 /*
141 * Invalidate the local caches
142 */
143 static void nfs_zap_caches_locked(struct inode *inode)
144 {
145 struct nfs_inode *nfsi = NFS_I(inode);
146 int mode = inode->i_mode;
147
148 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
149
150 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
151 nfsi->attrtimeo_timestamp = jiffies;
152
153 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
154 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
155 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
156 else
157 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
158 }
159
160 void nfs_zap_caches(struct inode *inode)
161 {
162 spin_lock(&inode->i_lock);
163 nfs_zap_caches_locked(inode);
164 spin_unlock(&inode->i_lock);
165 }
166
167 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
168 {
169 if (mapping->nrpages != 0) {
170 spin_lock(&inode->i_lock);
171 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
172 spin_unlock(&inode->i_lock);
173 }
174 }
175
176 void nfs_zap_acl_cache(struct inode *inode)
177 {
178 void (*clear_acl_cache)(struct inode *);
179
180 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
181 if (clear_acl_cache != NULL)
182 clear_acl_cache(inode);
183 spin_lock(&inode->i_lock);
184 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
185 spin_unlock(&inode->i_lock);
186 }
187
188 void nfs_invalidate_atime(struct inode *inode)
189 {
190 spin_lock(&inode->i_lock);
191 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
192 spin_unlock(&inode->i_lock);
193 }
194
195 /*
196 * Invalidate, but do not unhash, the inode.
197 * NB: must be called with inode->i_lock held!
198 */
199 static void nfs_invalidate_inode(struct inode *inode)
200 {
201 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
202 nfs_zap_caches_locked(inode);
203 }
204
205 struct nfs_find_desc {
206 struct nfs_fh *fh;
207 struct nfs_fattr *fattr;
208 };
209
210 /*
211 * In NFSv3 we can have 64bit inode numbers. In order to support
212 * this, and re-exported directories (also seen in NFSv2)
213 * we are forced to allow 2 different inodes to have the same
214 * i_ino.
215 */
216 static int
217 nfs_find_actor(struct inode *inode, void *opaque)
218 {
219 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
220 struct nfs_fh *fh = desc->fh;
221 struct nfs_fattr *fattr = desc->fattr;
222
223 if (NFS_FILEID(inode) != fattr->fileid)
224 return 0;
225 if (nfs_compare_fh(NFS_FH(inode), fh))
226 return 0;
227 if (is_bad_inode(inode) || NFS_STALE(inode))
228 return 0;
229 return 1;
230 }
231
232 static int
233 nfs_init_locked(struct inode *inode, void *opaque)
234 {
235 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
236 struct nfs_fattr *fattr = desc->fattr;
237
238 set_nfs_fileid(inode, fattr->fileid);
239 nfs_copy_fh(NFS_FH(inode), desc->fh);
240 return 0;
241 }
242
243 /*
244 * This is our front-end to iget that looks up inodes by file handle
245 * instead of inode number.
246 */
247 struct inode *
248 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
249 {
250 struct nfs_find_desc desc = {
251 .fh = fh,
252 .fattr = fattr
253 };
254 struct inode *inode = ERR_PTR(-ENOENT);
255 unsigned long hash;
256
257 nfs_attr_check_mountpoint(sb, fattr);
258
259 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
260 !nfs_attr_use_mounted_on_fileid(fattr))
261 goto out_no_inode;
262 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
263 goto out_no_inode;
264
265 hash = nfs_fattr_to_ino_t(fattr);
266
267 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
268 if (inode == NULL) {
269 inode = ERR_PTR(-ENOMEM);
270 goto out_no_inode;
271 }
272
273 if (inode->i_state & I_NEW) {
274 struct nfs_inode *nfsi = NFS_I(inode);
275 unsigned long now = jiffies;
276
277 /* We set i_ino for the few things that still rely on it,
278 * such as stat(2) */
279 inode->i_ino = hash;
280
281 /* We can't support update_atime(), since the server will reset it */
282 inode->i_flags |= S_NOATIME|S_NOCMTIME;
283 inode->i_mode = fattr->mode;
284 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
285 && nfs_server_capable(inode, NFS_CAP_MODE))
286 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
287 | NFS_INO_INVALID_ACCESS
288 | NFS_INO_INVALID_ACL;
289 /* Why so? Because we want revalidate for devices/FIFOs, and
290 * that's precisely what we have in nfs_file_inode_operations.
291 */
292 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
293 if (S_ISREG(inode->i_mode)) {
294 inode->i_fop = &nfs_file_operations;
295 inode->i_data.a_ops = &nfs_file_aops;
296 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
297 } else if (S_ISDIR(inode->i_mode)) {
298 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
299 inode->i_fop = &nfs_dir_operations;
300 inode->i_data.a_ops = &nfs_dir_aops;
301 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS))
302 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
303 /* Deal with crossing mountpoints */
304 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
305 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
306 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
307 inode->i_op = &nfs_referral_inode_operations;
308 else
309 inode->i_op = &nfs_mountpoint_inode_operations;
310 inode->i_fop = NULL;
311 inode->i_flags |= S_AUTOMOUNT;
312 }
313 } else if (S_ISLNK(inode->i_mode))
314 inode->i_op = &nfs_symlink_inode_operations;
315 else
316 init_special_inode(inode, inode->i_mode, fattr->rdev);
317
318 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
319 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
320 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
321 nfsi->change_attr = 0;
322 inode->i_size = 0;
323 inode->i_nlink = 0;
324 inode->i_uid = -2;
325 inode->i_gid = -2;
326 inode->i_blocks = 0;
327 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
328
329 nfsi->read_cache_jiffies = fattr->time_start;
330 nfsi->attr_gencount = fattr->gencount;
331 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
332 inode->i_atime = fattr->atime;
333 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
334 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
335 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
336 inode->i_mtime = fattr->mtime;
337 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
338 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
339 | NFS_INO_INVALID_DATA;
340 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
341 inode->i_ctime = fattr->ctime;
342 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
343 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
344 | NFS_INO_INVALID_ACCESS
345 | NFS_INO_INVALID_ACL;
346 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
347 nfsi->change_attr = fattr->change_attr;
348 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
349 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
350 | NFS_INO_INVALID_DATA;
351 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
352 inode->i_size = nfs_size_to_loff_t(fattr->size);
353 else
354 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
355 | NFS_INO_INVALID_DATA
356 | NFS_INO_REVAL_PAGECACHE;
357 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
358 inode->i_nlink = fattr->nlink;
359 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
360 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
361 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
362 inode->i_uid = fattr->uid;
363 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
364 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
365 | NFS_INO_INVALID_ACCESS
366 | NFS_INO_INVALID_ACL;
367 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
368 inode->i_gid = fattr->gid;
369 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
370 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
371 | NFS_INO_INVALID_ACCESS
372 | NFS_INO_INVALID_ACL;
373 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
374 inode->i_blocks = fattr->du.nfs2.blocks;
375 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
376 /*
377 * report the blocks in 512byte units
378 */
379 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
380 }
381 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
382 nfsi->attrtimeo_timestamp = now;
383 nfsi->access_cache = RB_ROOT;
384
385 nfs_fscache_init_inode_cookie(inode);
386
387 unlock_new_inode(inode);
388 } else
389 nfs_refresh_inode(inode, fattr);
390 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
391 inode->i_sb->s_id,
392 (long long)NFS_FILEID(inode),
393 atomic_read(&inode->i_count));
394
395 out:
396 return inode;
397
398 out_no_inode:
399 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
400 goto out;
401 }
402
403 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE)
404
405 int
406 nfs_setattr(struct dentry *dentry, struct iattr *attr)
407 {
408 struct inode *inode = dentry->d_inode;
409 struct nfs_fattr *fattr;
410 int error = -ENOMEM;
411
412 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
413
414 /* skip mode change if it's just for clearing setuid/setgid */
415 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
416 attr->ia_valid &= ~ATTR_MODE;
417
418 if (attr->ia_valid & ATTR_SIZE) {
419 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
420 attr->ia_valid &= ~ATTR_SIZE;
421 }
422
423 /* Optimization: if the end result is no change, don't RPC */
424 attr->ia_valid &= NFS_VALID_ATTRS;
425 if ((attr->ia_valid & ~ATTR_FILE) == 0)
426 return 0;
427
428 /* Write all dirty data */
429 if (S_ISREG(inode->i_mode))
430 nfs_wb_all(inode);
431
432 fattr = nfs_alloc_fattr();
433 if (fattr == NULL)
434 goto out;
435 /*
436 * Return any delegations if we're going to change ACLs
437 */
438 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
439 nfs_inode_return_delegation(inode);
440 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
441 if (error == 0)
442 nfs_refresh_inode(inode, fattr);
443 nfs_free_fattr(fattr);
444 out:
445 return error;
446 }
447
448 /**
449 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
450 * @inode: inode of the file used
451 * @offset: file offset to start truncating
452 *
453 * This is a copy of the common vmtruncate, but with the locking
454 * corrected to take into account the fact that NFS requires
455 * inode->i_size to be updated under the inode->i_lock.
456 */
457 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
458 {
459 loff_t oldsize;
460 int err;
461
462 err = inode_newsize_ok(inode, offset);
463 if (err)
464 goto out;
465
466 spin_lock(&inode->i_lock);
467 oldsize = inode->i_size;
468 i_size_write(inode, offset);
469 spin_unlock(&inode->i_lock);
470
471 truncate_pagecache(inode, oldsize, offset);
472 out:
473 return err;
474 }
475
476 /**
477 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
478 * @inode: pointer to struct inode
479 * @attr: pointer to struct iattr
480 *
481 * Note: we do this in the *proc.c in order to ensure that
482 * it works for things like exclusive creates too.
483 */
484 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
485 {
486 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
487 spin_lock(&inode->i_lock);
488 if ((attr->ia_valid & ATTR_MODE) != 0) {
489 int mode = attr->ia_mode & S_IALLUGO;
490 mode |= inode->i_mode & ~S_IALLUGO;
491 inode->i_mode = mode;
492 }
493 if ((attr->ia_valid & ATTR_UID) != 0)
494 inode->i_uid = attr->ia_uid;
495 if ((attr->ia_valid & ATTR_GID) != 0)
496 inode->i_gid = attr->ia_gid;
497 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
498 spin_unlock(&inode->i_lock);
499 }
500 if ((attr->ia_valid & ATTR_SIZE) != 0) {
501 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
502 nfs_vmtruncate(inode, attr->ia_size);
503 }
504 }
505
506 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
507 {
508 struct inode *inode = dentry->d_inode;
509 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
510 int err;
511
512 /* Flush out writes to the server in order to update c/mtime. */
513 if (S_ISREG(inode->i_mode)) {
514 err = filemap_write_and_wait(inode->i_mapping);
515 if (err)
516 goto out;
517 }
518
519 /*
520 * We may force a getattr if the user cares about atime.
521 *
522 * Note that we only have to check the vfsmount flags here:
523 * - NFS always sets S_NOATIME by so checking it would give a
524 * bogus result
525 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
526 * no point in checking those.
527 */
528 if ((mnt->mnt_flags & MNT_NOATIME) ||
529 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
530 need_atime = 0;
531
532 if (need_atime)
533 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
534 else
535 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
536 if (!err) {
537 generic_fillattr(inode, stat);
538 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
539 }
540 out:
541 return err;
542 }
543
544 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
545 {
546 atomic_set(&l_ctx->count, 1);
547 l_ctx->lockowner = current->files;
548 l_ctx->pid = current->tgid;
549 INIT_LIST_HEAD(&l_ctx->list);
550 }
551
552 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
553 {
554 struct nfs_lock_context *pos;
555
556 list_for_each_entry(pos, &ctx->lock_context.list, list) {
557 if (pos->lockowner != current->files)
558 continue;
559 if (pos->pid != current->tgid)
560 continue;
561 atomic_inc(&pos->count);
562 return pos;
563 }
564 return NULL;
565 }
566
567 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
568 {
569 struct nfs_lock_context *res, *new = NULL;
570 struct inode *inode = ctx->dentry->d_inode;
571
572 spin_lock(&inode->i_lock);
573 res = __nfs_find_lock_context(ctx);
574 if (res == NULL) {
575 spin_unlock(&inode->i_lock);
576 new = kmalloc(sizeof(*new), GFP_KERNEL);
577 if (new == NULL)
578 return NULL;
579 nfs_init_lock_context(new);
580 spin_lock(&inode->i_lock);
581 res = __nfs_find_lock_context(ctx);
582 if (res == NULL) {
583 list_add_tail(&new->list, &ctx->lock_context.list);
584 new->open_context = ctx;
585 res = new;
586 new = NULL;
587 }
588 }
589 spin_unlock(&inode->i_lock);
590 kfree(new);
591 return res;
592 }
593
594 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
595 {
596 struct nfs_open_context *ctx = l_ctx->open_context;
597 struct inode *inode = ctx->dentry->d_inode;
598
599 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
600 return;
601 list_del(&l_ctx->list);
602 spin_unlock(&inode->i_lock);
603 kfree(l_ctx);
604 }
605
606 /**
607 * nfs_close_context - Common close_context() routine NFSv2/v3
608 * @ctx: pointer to context
609 * @is_sync: is this a synchronous close
610 *
611 * always ensure that the attributes are up to date if we're mounted
612 * with close-to-open semantics
613 */
614 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
615 {
616 struct inode *inode;
617 struct nfs_server *server;
618
619 if (!(ctx->mode & FMODE_WRITE))
620 return;
621 if (!is_sync)
622 return;
623 inode = ctx->dentry->d_inode;
624 if (!list_empty(&NFS_I(inode)->open_files))
625 return;
626 server = NFS_SERVER(inode);
627 if (server->flags & NFS_MOUNT_NOCTO)
628 return;
629 nfs_revalidate_inode(server, inode);
630 }
631
632 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred, fmode_t f_mode)
633 {
634 struct nfs_open_context *ctx;
635
636 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
637 if (ctx != NULL) {
638 nfs_sb_active(dentry->d_sb);
639 ctx->dentry = dget(dentry);
640 ctx->cred = get_rpccred(cred);
641 ctx->state = NULL;
642 ctx->mode = f_mode;
643 ctx->flags = 0;
644 ctx->error = 0;
645 nfs_init_lock_context(&ctx->lock_context);
646 ctx->lock_context.open_context = ctx;
647 INIT_LIST_HEAD(&ctx->list);
648 }
649 return ctx;
650 }
651
652 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
653 {
654 if (ctx != NULL)
655 atomic_inc(&ctx->lock_context.count);
656 return ctx;
657 }
658
659 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
660 {
661 struct inode *inode = ctx->dentry->d_inode;
662 struct super_block *sb = ctx->dentry->d_sb;
663
664 if (!list_empty(&ctx->list)) {
665 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
666 return;
667 list_del(&ctx->list);
668 spin_unlock(&inode->i_lock);
669 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
670 return;
671 if (inode != NULL)
672 NFS_PROTO(inode)->close_context(ctx, is_sync);
673 if (ctx->cred != NULL)
674 put_rpccred(ctx->cred);
675 dput(ctx->dentry);
676 nfs_sb_deactive(sb);
677 kfree(ctx);
678 }
679
680 void put_nfs_open_context(struct nfs_open_context *ctx)
681 {
682 __put_nfs_open_context(ctx, 0);
683 }
684
685 /*
686 * Ensure that mmap has a recent RPC credential for use when writing out
687 * shared pages
688 */
689 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
690 {
691 struct inode *inode = filp->f_path.dentry->d_inode;
692 struct nfs_inode *nfsi = NFS_I(inode);
693
694 filp->private_data = get_nfs_open_context(ctx);
695 spin_lock(&inode->i_lock);
696 list_add(&ctx->list, &nfsi->open_files);
697 spin_unlock(&inode->i_lock);
698 }
699
700 /*
701 * Given an inode, search for an open context with the desired characteristics
702 */
703 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
704 {
705 struct nfs_inode *nfsi = NFS_I(inode);
706 struct nfs_open_context *pos, *ctx = NULL;
707
708 spin_lock(&inode->i_lock);
709 list_for_each_entry(pos, &nfsi->open_files, list) {
710 if (cred != NULL && pos->cred != cred)
711 continue;
712 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
713 continue;
714 ctx = get_nfs_open_context(pos);
715 break;
716 }
717 spin_unlock(&inode->i_lock);
718 return ctx;
719 }
720
721 static void nfs_file_clear_open_context(struct file *filp)
722 {
723 struct inode *inode = filp->f_path.dentry->d_inode;
724 struct nfs_open_context *ctx = nfs_file_open_context(filp);
725
726 if (ctx) {
727 filp->private_data = NULL;
728 spin_lock(&inode->i_lock);
729 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
730 spin_unlock(&inode->i_lock);
731 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
732 }
733 }
734
735 /*
736 * These allocate and release file read/write context information.
737 */
738 int nfs_open(struct inode *inode, struct file *filp)
739 {
740 struct nfs_open_context *ctx;
741 struct rpc_cred *cred;
742
743 cred = rpc_lookup_cred();
744 if (IS_ERR(cred))
745 return PTR_ERR(cred);
746 ctx = alloc_nfs_open_context(filp->f_path.dentry, cred, filp->f_mode);
747 put_rpccred(cred);
748 if (ctx == NULL)
749 return -ENOMEM;
750 nfs_file_set_open_context(filp, ctx);
751 put_nfs_open_context(ctx);
752 nfs_fscache_set_inode_cookie(inode, filp);
753 return 0;
754 }
755
756 int nfs_release(struct inode *inode, struct file *filp)
757 {
758 nfs_file_clear_open_context(filp);
759 return 0;
760 }
761
762 /*
763 * This function is called whenever some part of NFS notices that
764 * the cached attributes have to be refreshed.
765 */
766 int
767 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
768 {
769 int status = -ESTALE;
770 struct nfs_fattr *fattr = NULL;
771 struct nfs_inode *nfsi = NFS_I(inode);
772
773 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
774 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
775
776 if (is_bad_inode(inode))
777 goto out;
778 if (NFS_STALE(inode))
779 goto out;
780
781 status = -ENOMEM;
782 fattr = nfs_alloc_fattr();
783 if (fattr == NULL)
784 goto out;
785
786 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
787 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
788 if (status != 0) {
789 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
790 inode->i_sb->s_id,
791 (long long)NFS_FILEID(inode), status);
792 if (status == -ESTALE) {
793 nfs_zap_caches(inode);
794 if (!S_ISDIR(inode->i_mode))
795 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
796 }
797 goto out;
798 }
799
800 status = nfs_refresh_inode(inode, fattr);
801 if (status) {
802 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
803 inode->i_sb->s_id,
804 (long long)NFS_FILEID(inode), status);
805 goto out;
806 }
807
808 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
809 nfs_zap_acl_cache(inode);
810
811 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
812 inode->i_sb->s_id,
813 (long long)NFS_FILEID(inode));
814
815 out:
816 nfs_free_fattr(fattr);
817 return status;
818 }
819
820 int nfs_attribute_timeout(struct inode *inode)
821 {
822 struct nfs_inode *nfsi = NFS_I(inode);
823
824 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
825 }
826
827 static int nfs_attribute_cache_expired(struct inode *inode)
828 {
829 if (nfs_have_delegated_attributes(inode))
830 return 0;
831 return nfs_attribute_timeout(inode);
832 }
833
834 /**
835 * nfs_revalidate_inode - Revalidate the inode attributes
836 * @server - pointer to nfs_server struct
837 * @inode - pointer to inode struct
838 *
839 * Updates inode attribute information by retrieving the data from the server.
840 */
841 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
842 {
843 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
844 && !nfs_attribute_cache_expired(inode))
845 return NFS_STALE(inode) ? -ESTALE : 0;
846 return __nfs_revalidate_inode(server, inode);
847 }
848
849 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
850 {
851 struct nfs_inode *nfsi = NFS_I(inode);
852
853 if (mapping->nrpages != 0) {
854 int ret = invalidate_inode_pages2(mapping);
855 if (ret < 0)
856 return ret;
857 }
858 spin_lock(&inode->i_lock);
859 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
860 if (S_ISDIR(inode->i_mode))
861 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
862 spin_unlock(&inode->i_lock);
863 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
864 nfs_fscache_reset_inode_cookie(inode);
865 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
866 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
867 return 0;
868 }
869
870 /**
871 * nfs_revalidate_mapping - Revalidate the pagecache
872 * @inode - pointer to host inode
873 * @mapping - pointer to mapping
874 */
875 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
876 {
877 struct nfs_inode *nfsi = NFS_I(inode);
878 int ret = 0;
879
880 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
881 || nfs_attribute_cache_expired(inode)
882 || NFS_STALE(inode)) {
883 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
884 if (ret < 0)
885 goto out;
886 }
887 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
888 ret = nfs_invalidate_mapping(inode, mapping);
889 out:
890 return ret;
891 }
892
893 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
894 {
895 struct nfs_inode *nfsi = NFS_I(inode);
896 unsigned long ret = 0;
897
898 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
899 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
900 && nfsi->change_attr == fattr->pre_change_attr) {
901 nfsi->change_attr = fattr->change_attr;
902 if (S_ISDIR(inode->i_mode))
903 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
904 ret |= NFS_INO_INVALID_ATTR;
905 }
906 /* If we have atomic WCC data, we may update some attributes */
907 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
908 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
909 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
910 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
911 ret |= NFS_INO_INVALID_ATTR;
912 }
913
914 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
915 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
916 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
917 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
918 if (S_ISDIR(inode->i_mode))
919 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
920 ret |= NFS_INO_INVALID_ATTR;
921 }
922 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
923 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
924 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
925 && nfsi->npages == 0) {
926 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
927 ret |= NFS_INO_INVALID_ATTR;
928 }
929 return ret;
930 }
931
932 /**
933 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
934 * @inode - pointer to inode
935 * @fattr - updated attributes
936 *
937 * Verifies the attribute cache. If we have just changed the attributes,
938 * so that fattr carries weak cache consistency data, then it may
939 * also update the ctime/mtime/change_attribute.
940 */
941 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
942 {
943 struct nfs_inode *nfsi = NFS_I(inode);
944 loff_t cur_size, new_isize;
945 unsigned long invalid = 0;
946
947
948 /* Has the inode gone and changed behind our back? */
949 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
950 return -EIO;
951 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
952 return -EIO;
953
954 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
955 nfsi->change_attr != fattr->change_attr)
956 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
957
958 /* Verify a few of the more important attributes */
959 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
960 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
961
962 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
963 cur_size = i_size_read(inode);
964 new_isize = nfs_size_to_loff_t(fattr->size);
965 if (cur_size != new_isize && nfsi->npages == 0)
966 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
967 }
968
969 /* Have any file permissions changed? */
970 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
971 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
972 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
973 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
974 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
975 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
976
977 /* Has the link count changed? */
978 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
979 invalid |= NFS_INO_INVALID_ATTR;
980
981 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
982 invalid |= NFS_INO_INVALID_ATIME;
983
984 if (invalid != 0)
985 nfsi->cache_validity |= invalid;
986
987 nfsi->read_cache_jiffies = fattr->time_start;
988 return 0;
989 }
990
991 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
992 {
993 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
994 return 0;
995 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
996 }
997
998 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
999 {
1000 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1001 return 0;
1002 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1003 }
1004
1005 static atomic_long_t nfs_attr_generation_counter;
1006
1007 static unsigned long nfs_read_attr_generation_counter(void)
1008 {
1009 return atomic_long_read(&nfs_attr_generation_counter);
1010 }
1011
1012 unsigned long nfs_inc_attr_generation_counter(void)
1013 {
1014 return atomic_long_inc_return(&nfs_attr_generation_counter);
1015 }
1016
1017 void nfs_fattr_init(struct nfs_fattr *fattr)
1018 {
1019 fattr->valid = 0;
1020 fattr->time_start = jiffies;
1021 fattr->gencount = nfs_inc_attr_generation_counter();
1022 }
1023
1024 struct nfs_fattr *nfs_alloc_fattr(void)
1025 {
1026 struct nfs_fattr *fattr;
1027
1028 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1029 if (fattr != NULL)
1030 nfs_fattr_init(fattr);
1031 return fattr;
1032 }
1033
1034 struct nfs_fh *nfs_alloc_fhandle(void)
1035 {
1036 struct nfs_fh *fh;
1037
1038 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1039 if (fh != NULL)
1040 fh->size = 0;
1041 return fh;
1042 }
1043
1044 /**
1045 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1046 * @inode - pointer to inode
1047 * @fattr - attributes
1048 *
1049 * Attempt to divine whether or not an RPC call reply carrying stale
1050 * attributes got scheduled after another call carrying updated ones.
1051 *
1052 * To do so, the function first assumes that a more recent ctime means
1053 * that the attributes in fattr are newer, however it also attempt to
1054 * catch the case where ctime either didn't change, or went backwards
1055 * (if someone reset the clock on the server) by looking at whether
1056 * or not this RPC call was started after the inode was last updated.
1057 * Note also the check for wraparound of 'attr_gencount'
1058 *
1059 * The function returns 'true' if it thinks the attributes in 'fattr' are
1060 * more recent than the ones cached in the inode.
1061 *
1062 */
1063 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1064 {
1065 const struct nfs_inode *nfsi = NFS_I(inode);
1066
1067 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1068 nfs_ctime_need_update(inode, fattr) ||
1069 nfs_size_need_update(inode, fattr) ||
1070 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1071 }
1072
1073 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1074 {
1075 if (nfs_inode_attrs_need_update(inode, fattr))
1076 return nfs_update_inode(inode, fattr);
1077 return nfs_check_inode_attributes(inode, fattr);
1078 }
1079
1080 /**
1081 * nfs_refresh_inode - try to update the inode attribute cache
1082 * @inode - pointer to inode
1083 * @fattr - updated attributes
1084 *
1085 * Check that an RPC call that returned attributes has not overlapped with
1086 * other recent updates of the inode metadata, then decide whether it is
1087 * safe to do a full update of the inode attributes, or whether just to
1088 * call nfs_check_inode_attributes.
1089 */
1090 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1091 {
1092 int status;
1093
1094 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1095 return 0;
1096 spin_lock(&inode->i_lock);
1097 status = nfs_refresh_inode_locked(inode, fattr);
1098 spin_unlock(&inode->i_lock);
1099
1100 return status;
1101 }
1102
1103 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1104 {
1105 struct nfs_inode *nfsi = NFS_I(inode);
1106
1107 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1108 if (S_ISDIR(inode->i_mode))
1109 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1110 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1111 return 0;
1112 return nfs_refresh_inode_locked(inode, fattr);
1113 }
1114
1115 /**
1116 * nfs_post_op_update_inode - try to update the inode attribute cache
1117 * @inode - pointer to inode
1118 * @fattr - updated attributes
1119 *
1120 * After an operation that has changed the inode metadata, mark the
1121 * attribute cache as being invalid, then try to update it.
1122 *
1123 * NB: if the server didn't return any post op attributes, this
1124 * function will force the retrieval of attributes before the next
1125 * NFS request. Thus it should be used only for operations that
1126 * are expected to change one or more attributes, to avoid
1127 * unnecessary NFS requests and trips through nfs_update_inode().
1128 */
1129 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1130 {
1131 int status;
1132
1133 spin_lock(&inode->i_lock);
1134 status = nfs_post_op_update_inode_locked(inode, fattr);
1135 spin_unlock(&inode->i_lock);
1136 return status;
1137 }
1138
1139 /**
1140 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1141 * @inode - pointer to inode
1142 * @fattr - updated attributes
1143 *
1144 * After an operation that has changed the inode metadata, mark the
1145 * attribute cache as being invalid, then try to update it. Fake up
1146 * weak cache consistency data, if none exist.
1147 *
1148 * This function is mainly designed to be used by the ->write_done() functions.
1149 */
1150 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1151 {
1152 int status;
1153
1154 spin_lock(&inode->i_lock);
1155 /* Don't do a WCC update if these attributes are already stale */
1156 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1157 !nfs_inode_attrs_need_update(inode, fattr)) {
1158 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1159 | NFS_ATTR_FATTR_PRESIZE
1160 | NFS_ATTR_FATTR_PREMTIME
1161 | NFS_ATTR_FATTR_PRECTIME);
1162 goto out_noforce;
1163 }
1164 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1165 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1166 fattr->pre_change_attr = NFS_I(inode)->change_attr;
1167 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1168 }
1169 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1170 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1171 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1172 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1173 }
1174 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1175 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1176 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1177 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1178 }
1179 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1180 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1181 fattr->pre_size = i_size_read(inode);
1182 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1183 }
1184 out_noforce:
1185 status = nfs_post_op_update_inode_locked(inode, fattr);
1186 spin_unlock(&inode->i_lock);
1187 return status;
1188 }
1189
1190 /*
1191 * Many nfs protocol calls return the new file attributes after
1192 * an operation. Here we update the inode to reflect the state
1193 * of the server's inode.
1194 *
1195 * This is a bit tricky because we have to make sure all dirty pages
1196 * have been sent off to the server before calling invalidate_inode_pages.
1197 * To make sure no other process adds more write requests while we try
1198 * our best to flush them, we make them sleep during the attribute refresh.
1199 *
1200 * A very similar scenario holds for the dir cache.
1201 */
1202 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1203 {
1204 struct nfs_server *server;
1205 struct nfs_inode *nfsi = NFS_I(inode);
1206 loff_t cur_isize, new_isize;
1207 unsigned long invalid = 0;
1208 unsigned long now = jiffies;
1209 unsigned long save_cache_validity;
1210
1211 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1212 __func__, inode->i_sb->s_id, inode->i_ino,
1213 atomic_read(&inode->i_count), fattr->valid);
1214
1215 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1216 goto out_fileid;
1217
1218 /*
1219 * Make sure the inode's type hasn't changed.
1220 */
1221 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1222 goto out_changed;
1223
1224 server = NFS_SERVER(inode);
1225 /* Update the fsid? */
1226 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1227 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1228 !IS_AUTOMOUNT(inode))
1229 server->fsid = fattr->fsid;
1230
1231 /*
1232 * Update the read time so we don't revalidate too often.
1233 */
1234 nfsi->read_cache_jiffies = fattr->time_start;
1235
1236 save_cache_validity = nfsi->cache_validity;
1237 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1238 | NFS_INO_INVALID_ATIME
1239 | NFS_INO_REVAL_FORCED
1240 | NFS_INO_REVAL_PAGECACHE);
1241
1242 /* Do atomic weak cache consistency updates */
1243 invalid |= nfs_wcc_update_inode(inode, fattr);
1244
1245 /* More cache consistency checks */
1246 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1247 if (nfsi->change_attr != fattr->change_attr) {
1248 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1249 inode->i_sb->s_id, inode->i_ino);
1250 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1251 if (S_ISDIR(inode->i_mode))
1252 nfs_force_lookup_revalidate(inode);
1253 nfsi->change_attr = fattr->change_attr;
1254 }
1255 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1256 invalid |= save_cache_validity;
1257
1258 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1259 /* NFSv2/v3: Check if the mtime agrees */
1260 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1261 dprintk("NFS: mtime change on server for file %s/%ld\n",
1262 inode->i_sb->s_id, inode->i_ino);
1263 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1264 if (S_ISDIR(inode->i_mode))
1265 nfs_force_lookup_revalidate(inode);
1266 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1267 }
1268 } else if (server->caps & NFS_CAP_MTIME)
1269 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1270 | NFS_INO_INVALID_DATA
1271 | NFS_INO_REVAL_PAGECACHE
1272 | NFS_INO_REVAL_FORCED);
1273
1274 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1275 /* If ctime has changed we should definitely clear access+acl caches */
1276 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1277 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1278 /* and probably clear data for a directory too as utimes can cause
1279 * havoc with our cache.
1280 */
1281 if (S_ISDIR(inode->i_mode)) {
1282 invalid |= NFS_INO_INVALID_DATA;
1283 nfs_force_lookup_revalidate(inode);
1284 }
1285 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1286 }
1287 } else if (server->caps & NFS_CAP_CTIME)
1288 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1289 | NFS_INO_INVALID_ACCESS
1290 | NFS_INO_INVALID_ACL
1291 | NFS_INO_REVAL_FORCED);
1292
1293 /* Check if our cached file size is stale */
1294 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1295 new_isize = nfs_size_to_loff_t(fattr->size);
1296 cur_isize = i_size_read(inode);
1297 if (new_isize != cur_isize) {
1298 /* Do we perhaps have any outstanding writes, or has
1299 * the file grown beyond our last write? */
1300 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1301 new_isize > cur_isize) {
1302 i_size_write(inode, new_isize);
1303 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1304 }
1305 dprintk("NFS: isize change on server for file %s/%ld "
1306 "(%Ld to %Ld)\n",
1307 inode->i_sb->s_id,
1308 inode->i_ino,
1309 (long long)cur_isize,
1310 (long long)new_isize);
1311 }
1312 } else
1313 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1314 | NFS_INO_REVAL_PAGECACHE
1315 | NFS_INO_REVAL_FORCED);
1316
1317
1318 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1319 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1320 else if (server->caps & NFS_CAP_ATIME)
1321 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1322 | NFS_INO_REVAL_FORCED);
1323
1324 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1325 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1326 umode_t newmode = inode->i_mode & S_IFMT;
1327 newmode |= fattr->mode & S_IALLUGO;
1328 inode->i_mode = newmode;
1329 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1330 }
1331 } else if (server->caps & NFS_CAP_MODE)
1332 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1333 | NFS_INO_INVALID_ACCESS
1334 | NFS_INO_INVALID_ACL
1335 | NFS_INO_REVAL_FORCED);
1336
1337 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1338 if (inode->i_uid != fattr->uid) {
1339 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1340 inode->i_uid = fattr->uid;
1341 }
1342 } else if (server->caps & NFS_CAP_OWNER)
1343 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1344 | NFS_INO_INVALID_ACCESS
1345 | NFS_INO_INVALID_ACL
1346 | NFS_INO_REVAL_FORCED);
1347
1348 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1349 if (inode->i_gid != fattr->gid) {
1350 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1351 inode->i_gid = fattr->gid;
1352 }
1353 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1354 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1355 | NFS_INO_INVALID_ACCESS
1356 | NFS_INO_INVALID_ACL
1357 | NFS_INO_REVAL_FORCED);
1358
1359 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1360 if (inode->i_nlink != fattr->nlink) {
1361 invalid |= NFS_INO_INVALID_ATTR;
1362 if (S_ISDIR(inode->i_mode))
1363 invalid |= NFS_INO_INVALID_DATA;
1364 inode->i_nlink = fattr->nlink;
1365 }
1366 } else if (server->caps & NFS_CAP_NLINK)
1367 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1368 | NFS_INO_REVAL_FORCED);
1369
1370 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1371 /*
1372 * report the blocks in 512byte units
1373 */
1374 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1375 }
1376 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1377 inode->i_blocks = fattr->du.nfs2.blocks;
1378
1379 /* Update attrtimeo value if we're out of the unstable period */
1380 if (invalid & NFS_INO_INVALID_ATTR) {
1381 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1382 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1383 nfsi->attrtimeo_timestamp = now;
1384 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1385 } else {
1386 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1387 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1388 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1389 nfsi->attrtimeo_timestamp = now;
1390 }
1391 }
1392 invalid &= ~NFS_INO_INVALID_ATTR;
1393 /* Don't invalidate the data if we were to blame */
1394 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1395 || S_ISLNK(inode->i_mode)))
1396 invalid &= ~NFS_INO_INVALID_DATA;
1397 if (!nfs_have_delegation(inode, FMODE_READ) ||
1398 (save_cache_validity & NFS_INO_REVAL_FORCED))
1399 nfsi->cache_validity |= invalid;
1400
1401 return 0;
1402 out_changed:
1403 /*
1404 * Big trouble! The inode has become a different object.
1405 */
1406 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1407 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1408 out_err:
1409 /*
1410 * No need to worry about unhashing the dentry, as the
1411 * lookup validation will know that the inode is bad.
1412 * (But we fall through to invalidate the caches.)
1413 */
1414 nfs_invalidate_inode(inode);
1415 return -ESTALE;
1416
1417 out_fileid:
1418 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1419 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1420 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
1421 (long long)nfsi->fileid, (long long)fattr->fileid);
1422 goto out_err;
1423 }
1424
1425
1426 #ifdef CONFIG_NFS_V4
1427
1428 /*
1429 * Clean out any remaining NFSv4 state that might be left over due
1430 * to open() calls that passed nfs_atomic_lookup, but failed to call
1431 * nfs_open().
1432 */
1433 void nfs4_evict_inode(struct inode *inode)
1434 {
1435 truncate_inode_pages(&inode->i_data, 0);
1436 end_writeback(inode);
1437 pnfs_return_layout(inode);
1438 pnfs_destroy_layout(NFS_I(inode));
1439 /* If we are holding a delegation, return it! */
1440 nfs_inode_return_delegation_noreclaim(inode);
1441 /* First call standard NFS clear_inode() code */
1442 nfs_clear_inode(inode);
1443 }
1444 #endif
1445
1446 struct inode *nfs_alloc_inode(struct super_block *sb)
1447 {
1448 struct nfs_inode *nfsi;
1449 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1450 if (!nfsi)
1451 return NULL;
1452 nfsi->flags = 0UL;
1453 nfsi->cache_validity = 0UL;
1454 #ifdef CONFIG_NFS_V3_ACL
1455 nfsi->acl_access = ERR_PTR(-EAGAIN);
1456 nfsi->acl_default = ERR_PTR(-EAGAIN);
1457 #endif
1458 #ifdef CONFIG_NFS_V4
1459 nfsi->nfs4_acl = NULL;
1460 #endif /* CONFIG_NFS_V4 */
1461 return &nfsi->vfs_inode;
1462 }
1463
1464 static void nfs_i_callback(struct rcu_head *head)
1465 {
1466 struct inode *inode = container_of(head, struct inode, i_rcu);
1467 INIT_LIST_HEAD(&inode->i_dentry);
1468 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1469 }
1470
1471 void nfs_destroy_inode(struct inode *inode)
1472 {
1473 call_rcu(&inode->i_rcu, nfs_i_callback);
1474 }
1475
1476 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1477 {
1478 #ifdef CONFIG_NFS_V4
1479 INIT_LIST_HEAD(&nfsi->open_states);
1480 nfsi->delegation = NULL;
1481 nfsi->delegation_state = 0;
1482 init_rwsem(&nfsi->rwsem);
1483 nfsi->layout = NULL;
1484 atomic_set(&nfsi->commits_outstanding, 0);
1485 #endif
1486 }
1487
1488 static void init_once(void *foo)
1489 {
1490 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1491
1492 inode_init_once(&nfsi->vfs_inode);
1493 INIT_LIST_HEAD(&nfsi->open_files);
1494 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1495 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1496 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1497 nfsi->npages = 0;
1498 nfsi->ncommit = 0;
1499 atomic_set(&nfsi->silly_count, 1);
1500 INIT_HLIST_HEAD(&nfsi->silly_list);
1501 init_waitqueue_head(&nfsi->waitqueue);
1502 nfs4_init_once(nfsi);
1503 }
1504
1505 static int __init nfs_init_inodecache(void)
1506 {
1507 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1508 sizeof(struct nfs_inode),
1509 0, (SLAB_RECLAIM_ACCOUNT|
1510 SLAB_MEM_SPREAD),
1511 init_once);
1512 if (nfs_inode_cachep == NULL)
1513 return -ENOMEM;
1514
1515 return 0;
1516 }
1517
1518 static void nfs_destroy_inodecache(void)
1519 {
1520 kmem_cache_destroy(nfs_inode_cachep);
1521 }
1522
1523 struct workqueue_struct *nfsiod_workqueue;
1524
1525 /*
1526 * start up the nfsiod workqueue
1527 */
1528 static int nfsiod_start(void)
1529 {
1530 struct workqueue_struct *wq;
1531 dprintk("RPC: creating workqueue nfsiod\n");
1532 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1533 if (wq == NULL)
1534 return -ENOMEM;
1535 nfsiod_workqueue = wq;
1536 return 0;
1537 }
1538
1539 /*
1540 * Destroy the nfsiod workqueue
1541 */
1542 static void nfsiod_stop(void)
1543 {
1544 struct workqueue_struct *wq;
1545
1546 wq = nfsiod_workqueue;
1547 if (wq == NULL)
1548 return;
1549 nfsiod_workqueue = NULL;
1550 destroy_workqueue(wq);
1551 }
1552
1553 /*
1554 * Initialize NFS
1555 */
1556 static int __init init_nfs_fs(void)
1557 {
1558 int err;
1559
1560 err = nfs_idmap_init();
1561 if (err < 0)
1562 goto out9;
1563
1564 err = nfs_dns_resolver_init();
1565 if (err < 0)
1566 goto out8;
1567
1568 err = nfs_fscache_register();
1569 if (err < 0)
1570 goto out7;
1571
1572 err = nfsiod_start();
1573 if (err)
1574 goto out6;
1575
1576 err = nfs_fs_proc_init();
1577 if (err)
1578 goto out5;
1579
1580 err = nfs_init_nfspagecache();
1581 if (err)
1582 goto out4;
1583
1584 err = nfs_init_inodecache();
1585 if (err)
1586 goto out3;
1587
1588 err = nfs_init_readpagecache();
1589 if (err)
1590 goto out2;
1591
1592 err = nfs_init_writepagecache();
1593 if (err)
1594 goto out1;
1595
1596 err = nfs_init_directcache();
1597 if (err)
1598 goto out0;
1599
1600 #ifdef CONFIG_PROC_FS
1601 rpc_proc_register(&nfs_rpcstat);
1602 #endif
1603 if ((err = register_nfs_fs()) != 0)
1604 goto out;
1605 return 0;
1606 out:
1607 #ifdef CONFIG_PROC_FS
1608 rpc_proc_unregister("nfs");
1609 #endif
1610 nfs_destroy_directcache();
1611 out0:
1612 nfs_destroy_writepagecache();
1613 out1:
1614 nfs_destroy_readpagecache();
1615 out2:
1616 nfs_destroy_inodecache();
1617 out3:
1618 nfs_destroy_nfspagecache();
1619 out4:
1620 nfs_fs_proc_exit();
1621 out5:
1622 nfsiod_stop();
1623 out6:
1624 nfs_fscache_unregister();
1625 out7:
1626 nfs_dns_resolver_destroy();
1627 out8:
1628 nfs_idmap_quit();
1629 out9:
1630 return err;
1631 }
1632
1633 static void __exit exit_nfs_fs(void)
1634 {
1635 nfs_destroy_directcache();
1636 nfs_destroy_writepagecache();
1637 nfs_destroy_readpagecache();
1638 nfs_destroy_inodecache();
1639 nfs_destroy_nfspagecache();
1640 nfs_fscache_unregister();
1641 nfs_dns_resolver_destroy();
1642 nfs_idmap_quit();
1643 #ifdef CONFIG_PROC_FS
1644 rpc_proc_unregister("nfs");
1645 #endif
1646 nfs_cleanup_cb_ident_idr();
1647 unregister_nfs_fs();
1648 nfs_fs_proc_exit();
1649 nfsiod_stop();
1650 }
1651
1652 /* Not quite true; I just maintain it */
1653 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1654 MODULE_LICENSE("GPL");
1655 module_param(enable_ino64, bool, 0644);
1656
1657 module_init(init_nfs_fs)
1658 module_exit(exit_nfs_fs)
Linux Btrfs Development