4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
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>
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>
41 #include <asm/system.h>
42 #include <asm/uaccess.h>
46 #include "delegation.h"
50 #include "dns_resolve.h"
52 #define NFSDBG_FACILITY NFSDBG_VFS
54 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
56 /* Default is to see 64-bit inode numbers */
57 static int enable_ino64
= NFS_64_BIT_INODE_NUMBERS_ENABLED
;
59 static void nfs_invalidate_inode(struct inode
*);
60 static int nfs_update_inode(struct inode
*, struct nfs_fattr
*);
62 static struct kmem_cache
* nfs_inode_cachep
;
64 static inline unsigned long
65 nfs_fattr_to_ino_t(struct nfs_fattr
*fattr
)
67 return nfs_fileid_to_ino_t(fattr
->fileid
);
71 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
72 * @word: long word containing the bit lock
74 int nfs_wait_bit_killable(void *word
)
76 if (fatal_signal_pending(current
))
83 * nfs_compat_user_ino64 - returns the user-visible inode number
84 * @fileid: 64-bit fileid
86 * This function returns a 32-bit inode number if the boot parameter
87 * nfs.enable_ino64 is zero.
89 u64
nfs_compat_user_ino64(u64 fileid
)
96 if (sizeof(ino
) < sizeof(fileid
))
97 ino
^= fileid
>> (sizeof(fileid
)-sizeof(ino
)) * 8;
101 void nfs_clear_inode(struct inode
*inode
)
104 * The following should never happen...
106 BUG_ON(nfs_have_writebacks(inode
));
107 BUG_ON(!list_empty(&NFS_I(inode
)->open_files
));
108 nfs_zap_acl_cache(inode
);
109 nfs_access_zap_cache(inode
);
110 nfs_fscache_release_inode_cookie(inode
);
114 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
116 int nfs_sync_mapping(struct address_space
*mapping
)
120 if (mapping
->nrpages
!= 0) {
121 unmap_mapping_range(mapping
, 0, 0, 0);
122 ret
= nfs_wb_all(mapping
->host
);
128 * Invalidate the local caches
130 static void nfs_zap_caches_locked(struct inode
*inode
)
132 struct nfs_inode
*nfsi
= NFS_I(inode
);
133 int mode
= inode
->i_mode
;
135 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
137 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
138 nfsi
->attrtimeo_timestamp
= jiffies
;
140 memset(NFS_COOKIEVERF(inode
), 0, sizeof(NFS_COOKIEVERF(inode
)));
141 if (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
))
142 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
|NFS_INO_REVAL_PAGECACHE
;
144 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
|NFS_INO_REVAL_PAGECACHE
;
147 void nfs_zap_caches(struct inode
*inode
)
149 spin_lock(&inode
->i_lock
);
150 nfs_zap_caches_locked(inode
);
151 spin_unlock(&inode
->i_lock
);
154 void nfs_zap_mapping(struct inode
*inode
, struct address_space
*mapping
)
156 if (mapping
->nrpages
!= 0) {
157 spin_lock(&inode
->i_lock
);
158 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_DATA
;
159 spin_unlock(&inode
->i_lock
);
163 void nfs_zap_acl_cache(struct inode
*inode
)
165 void (*clear_acl_cache
)(struct inode
*);
167 clear_acl_cache
= NFS_PROTO(inode
)->clear_acl_cache
;
168 if (clear_acl_cache
!= NULL
)
169 clear_acl_cache(inode
);
170 spin_lock(&inode
->i_lock
);
171 NFS_I(inode
)->cache_validity
&= ~NFS_INO_INVALID_ACL
;
172 spin_unlock(&inode
->i_lock
);
175 void nfs_invalidate_atime(struct inode
*inode
)
177 spin_lock(&inode
->i_lock
);
178 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ATIME
;
179 spin_unlock(&inode
->i_lock
);
183 * Invalidate, but do not unhash, the inode.
184 * NB: must be called with inode->i_lock held!
186 static void nfs_invalidate_inode(struct inode
*inode
)
188 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
189 nfs_zap_caches_locked(inode
);
192 struct nfs_find_desc
{
194 struct nfs_fattr
*fattr
;
198 * In NFSv3 we can have 64bit inode numbers. In order to support
199 * this, and re-exported directories (also seen in NFSv2)
200 * we are forced to allow 2 different inodes to have the same
204 nfs_find_actor(struct inode
*inode
, void *opaque
)
206 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
207 struct nfs_fh
*fh
= desc
->fh
;
208 struct nfs_fattr
*fattr
= desc
->fattr
;
210 if (NFS_FILEID(inode
) != fattr
->fileid
)
212 if (nfs_compare_fh(NFS_FH(inode
), fh
))
214 if (is_bad_inode(inode
) || NFS_STALE(inode
))
220 nfs_init_locked(struct inode
*inode
, void *opaque
)
222 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
223 struct nfs_fattr
*fattr
= desc
->fattr
;
225 set_nfs_fileid(inode
, fattr
->fileid
);
226 nfs_copy_fh(NFS_FH(inode
), desc
->fh
);
230 /* Don't use READDIRPLUS on directories that we believe are too large */
231 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
234 * This is our front-end to iget that looks up inodes by file handle
235 * instead of inode number.
238 nfs_fhget(struct super_block
*sb
, struct nfs_fh
*fh
, struct nfs_fattr
*fattr
)
240 struct nfs_find_desc desc
= {
244 struct inode
*inode
= ERR_PTR(-ENOENT
);
247 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) == 0)
249 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) == 0)
252 hash
= nfs_fattr_to_ino_t(fattr
);
254 inode
= iget5_locked(sb
, hash
, nfs_find_actor
, nfs_init_locked
, &desc
);
256 inode
= ERR_PTR(-ENOMEM
);
260 if (inode
->i_state
& I_NEW
) {
261 struct nfs_inode
*nfsi
= NFS_I(inode
);
262 unsigned long now
= jiffies
;
264 /* We set i_ino for the few things that still rely on it,
268 /* We can't support update_atime(), since the server will reset it */
269 inode
->i_flags
|= S_NOATIME
|S_NOCMTIME
;
270 inode
->i_mode
= fattr
->mode
;
271 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) == 0
272 && nfs_server_capable(inode
, NFS_CAP_MODE
))
273 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
274 | NFS_INO_INVALID_ACCESS
275 | NFS_INO_INVALID_ACL
;
276 /* Why so? Because we want revalidate for devices/FIFOs, and
277 * that's precisely what we have in nfs_file_inode_operations.
279 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_inode_ops
;
280 if (S_ISREG(inode
->i_mode
)) {
281 inode
->i_fop
= &nfs_file_operations
;
282 inode
->i_data
.a_ops
= &nfs_file_aops
;
283 inode
->i_data
.backing_dev_info
= &NFS_SB(sb
)->backing_dev_info
;
284 } else if (S_ISDIR(inode
->i_mode
)) {
285 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->dir_inode_ops
;
286 inode
->i_fop
= &nfs_dir_operations
;
287 if (nfs_server_capable(inode
, NFS_CAP_READDIRPLUS
)
288 && fattr
->size
<= NFS_LIMIT_READDIRPLUS
)
289 set_bit(NFS_INO_ADVISE_RDPLUS
, &NFS_I(inode
)->flags
);
290 /* Deal with crossing mountpoints */
291 if ((fattr
->valid
& NFS_ATTR_FATTR_FSID
)
292 && !nfs_fsid_equal(&NFS_SB(sb
)->fsid
, &fattr
->fsid
)) {
293 if (fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
)
294 inode
->i_op
= &nfs_referral_inode_operations
;
296 inode
->i_op
= &nfs_mountpoint_inode_operations
;
298 set_bit(NFS_INO_MOUNTPOINT
, &nfsi
->flags
);
300 } else if (S_ISLNK(inode
->i_mode
))
301 inode
->i_op
= &nfs_symlink_inode_operations
;
303 init_special_inode(inode
, inode
->i_mode
, fattr
->rdev
);
305 memset(&inode
->i_atime
, 0, sizeof(inode
->i_atime
));
306 memset(&inode
->i_mtime
, 0, sizeof(inode
->i_mtime
));
307 memset(&inode
->i_ctime
, 0, sizeof(inode
->i_ctime
));
308 nfsi
->change_attr
= 0;
314 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
316 nfsi
->read_cache_jiffies
= fattr
->time_start
;
317 nfsi
->attr_gencount
= fattr
->gencount
;
318 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
319 inode
->i_atime
= fattr
->atime
;
320 else if (nfs_server_capable(inode
, NFS_CAP_ATIME
))
321 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
322 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
323 inode
->i_mtime
= fattr
->mtime
;
324 else if (nfs_server_capable(inode
, NFS_CAP_MTIME
))
325 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
326 | NFS_INO_INVALID_DATA
;
327 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
328 inode
->i_ctime
= fattr
->ctime
;
329 else if (nfs_server_capable(inode
, NFS_CAP_CTIME
))
330 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
331 | NFS_INO_INVALID_ACCESS
332 | NFS_INO_INVALID_ACL
;
333 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
334 nfsi
->change_attr
= fattr
->change_attr
;
335 else if (nfs_server_capable(inode
, NFS_CAP_CHANGE_ATTR
))
336 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
337 | NFS_INO_INVALID_DATA
;
338 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
339 inode
->i_size
= nfs_size_to_loff_t(fattr
->size
);
341 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
342 | NFS_INO_INVALID_DATA
343 | NFS_INO_REVAL_PAGECACHE
;
344 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
)
345 inode
->i_nlink
= fattr
->nlink
;
346 else if (nfs_server_capable(inode
, NFS_CAP_NLINK
))
347 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
348 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
)
349 inode
->i_uid
= fattr
->uid
;
350 else if (nfs_server_capable(inode
, NFS_CAP_OWNER
))
351 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
352 | NFS_INO_INVALID_ACCESS
353 | NFS_INO_INVALID_ACL
;
354 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
)
355 inode
->i_gid
= fattr
->gid
;
356 else if (nfs_server_capable(inode
, NFS_CAP_OWNER_GROUP
))
357 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
358 | NFS_INO_INVALID_ACCESS
359 | NFS_INO_INVALID_ACL
;
360 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
361 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
362 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
364 * report the blocks in 512byte units
366 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
368 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
369 nfsi
->attrtimeo_timestamp
= now
;
370 nfsi
->access_cache
= RB_ROOT
;
372 nfs_fscache_init_inode_cookie(inode
);
374 unlock_new_inode(inode
);
376 nfs_refresh_inode(inode
, fattr
);
377 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
379 (long long)NFS_FILEID(inode
),
380 atomic_read(&inode
->i_count
));
386 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode
));
390 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE)
393 nfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
395 struct inode
*inode
= dentry
->d_inode
;
396 struct nfs_fattr
*fattr
;
399 nfs_inc_stats(inode
, NFSIOS_VFSSETATTR
);
401 /* skip mode change if it's just for clearing setuid/setgid */
402 if (attr
->ia_valid
& (ATTR_KILL_SUID
| ATTR_KILL_SGID
))
403 attr
->ia_valid
&= ~ATTR_MODE
;
405 if (attr
->ia_valid
& ATTR_SIZE
) {
406 if (!S_ISREG(inode
->i_mode
) || attr
->ia_size
== i_size_read(inode
))
407 attr
->ia_valid
&= ~ATTR_SIZE
;
410 /* Optimization: if the end result is no change, don't RPC */
411 attr
->ia_valid
&= NFS_VALID_ATTRS
;
412 if ((attr
->ia_valid
& ~ATTR_FILE
) == 0)
415 /* Write all dirty data */
416 if (S_ISREG(inode
->i_mode
)) {
417 filemap_write_and_wait(inode
->i_mapping
);
421 fattr
= nfs_alloc_fattr();
425 * Return any delegations if we're going to change ACLs
427 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0)
428 nfs_inode_return_delegation(inode
);
429 error
= NFS_PROTO(inode
)->setattr(dentry
, fattr
, attr
);
431 nfs_refresh_inode(inode
, fattr
);
432 nfs_free_fattr(fattr
);
438 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
439 * @inode: inode of the file used
440 * @offset: file offset to start truncating
442 * This is a copy of the common vmtruncate, but with the locking
443 * corrected to take into account the fact that NFS requires
444 * inode->i_size to be updated under the inode->i_lock.
446 static int nfs_vmtruncate(struct inode
* inode
, loff_t offset
)
451 err
= inode_newsize_ok(inode
, offset
);
455 spin_lock(&inode
->i_lock
);
456 oldsize
= inode
->i_size
;
457 i_size_write(inode
, offset
);
458 spin_unlock(&inode
->i_lock
);
460 truncate_pagecache(inode
, oldsize
, offset
);
466 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
467 * @inode: pointer to struct inode
468 * @attr: pointer to struct iattr
470 * Note: we do this in the *proc.c in order to ensure that
471 * it works for things like exclusive creates too.
473 void nfs_setattr_update_inode(struct inode
*inode
, struct iattr
*attr
)
475 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0) {
476 spin_lock(&inode
->i_lock
);
477 if ((attr
->ia_valid
& ATTR_MODE
) != 0) {
478 int mode
= attr
->ia_mode
& S_IALLUGO
;
479 mode
|= inode
->i_mode
& ~S_IALLUGO
;
480 inode
->i_mode
= mode
;
482 if ((attr
->ia_valid
& ATTR_UID
) != 0)
483 inode
->i_uid
= attr
->ia_uid
;
484 if ((attr
->ia_valid
& ATTR_GID
) != 0)
485 inode
->i_gid
= attr
->ia_gid
;
486 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
487 spin_unlock(&inode
->i_lock
);
489 if ((attr
->ia_valid
& ATTR_SIZE
) != 0) {
490 nfs_inc_stats(inode
, NFSIOS_SETATTRTRUNC
);
491 nfs_vmtruncate(inode
, attr
->ia_size
);
495 int nfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
497 struct inode
*inode
= dentry
->d_inode
;
498 int need_atime
= NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_ATIME
;
501 /* Flush out writes to the server in order to update c/mtime. */
502 if (S_ISREG(inode
->i_mode
)) {
503 err
= filemap_write_and_wait(inode
->i_mapping
);
509 * We may force a getattr if the user cares about atime.
511 * Note that we only have to check the vfsmount flags here:
512 * - NFS always sets S_NOATIME by so checking it would give a
514 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
515 * no point in checking those.
517 if ((mnt
->mnt_flags
& MNT_NOATIME
) ||
518 ((mnt
->mnt_flags
& MNT_NODIRATIME
) && S_ISDIR(inode
->i_mode
)))
522 err
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
524 err
= nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
526 generic_fillattr(inode
, stat
);
527 stat
->ino
= nfs_compat_user_ino64(NFS_FILEID(inode
));
533 static void nfs_init_lock_context(struct nfs_lock_context
*l_ctx
)
535 atomic_set(&l_ctx
->count
, 1);
536 l_ctx
->lockowner
= current
->files
;
537 l_ctx
->pid
= current
->tgid
;
538 INIT_LIST_HEAD(&l_ctx
->list
);
541 static struct nfs_lock_context
*__nfs_find_lock_context(struct nfs_open_context
*ctx
)
543 struct nfs_lock_context
*pos
;
545 list_for_each_entry(pos
, &ctx
->lock_context
.list
, list
) {
546 if (pos
->lockowner
!= current
->files
)
548 if (pos
->pid
!= current
->tgid
)
550 atomic_inc(&pos
->count
);
556 struct nfs_lock_context
*nfs_get_lock_context(struct nfs_open_context
*ctx
)
558 struct nfs_lock_context
*res
, *new = NULL
;
559 struct inode
*inode
= ctx
->path
.dentry
->d_inode
;
561 spin_lock(&inode
->i_lock
);
562 res
= __nfs_find_lock_context(ctx
);
564 spin_unlock(&inode
->i_lock
);
565 new = kmalloc(sizeof(*new), GFP_KERNEL
);
568 nfs_init_lock_context(new);
569 spin_lock(&inode
->i_lock
);
570 res
= __nfs_find_lock_context(ctx
);
572 list_add_tail(&new->list
, &ctx
->lock_context
.list
);
573 new->open_context
= ctx
;
578 spin_unlock(&inode
->i_lock
);
583 void nfs_put_lock_context(struct nfs_lock_context
*l_ctx
)
585 struct nfs_open_context
*ctx
= l_ctx
->open_context
;
586 struct inode
*inode
= ctx
->path
.dentry
->d_inode
;
588 if (!atomic_dec_and_lock(&l_ctx
->count
, &inode
->i_lock
))
590 list_del(&l_ctx
->list
);
591 spin_unlock(&inode
->i_lock
);
596 * nfs_close_context - Common close_context() routine NFSv2/v3
597 * @ctx: pointer to context
598 * @is_sync: is this a synchronous close
600 * always ensure that the attributes are up to date if we're mounted
601 * with close-to-open semantics
603 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
)
606 struct nfs_server
*server
;
608 if (!(ctx
->mode
& FMODE_WRITE
))
612 inode
= ctx
->path
.dentry
->d_inode
;
613 if (!list_empty(&NFS_I(inode
)->open_files
))
615 server
= NFS_SERVER(inode
);
616 if (server
->flags
& NFS_MOUNT_NOCTO
)
618 nfs_revalidate_inode(server
, inode
);
621 static struct nfs_open_context
*alloc_nfs_open_context(struct path
*path
, struct rpc_cred
*cred
)
623 struct nfs_open_context
*ctx
;
625 ctx
= kmalloc(sizeof(*ctx
), GFP_KERNEL
);
628 path_get(&ctx
->path
);
629 ctx
->cred
= get_rpccred(cred
);
634 nfs_init_lock_context(&ctx
->lock_context
);
635 ctx
->lock_context
.open_context
= ctx
;
640 struct nfs_open_context
*get_nfs_open_context(struct nfs_open_context
*ctx
)
643 atomic_inc(&ctx
->lock_context
.count
);
647 static void __put_nfs_open_context(struct nfs_open_context
*ctx
, int is_sync
)
649 struct inode
*inode
= ctx
->path
.dentry
->d_inode
;
651 if (!atomic_dec_and_lock(&ctx
->lock_context
.count
, &inode
->i_lock
))
653 list_del(&ctx
->list
);
654 spin_unlock(&inode
->i_lock
);
655 NFS_PROTO(inode
)->close_context(ctx
, is_sync
);
656 if (ctx
->cred
!= NULL
)
657 put_rpccred(ctx
->cred
);
658 path_put(&ctx
->path
);
662 void put_nfs_open_context(struct nfs_open_context
*ctx
)
664 __put_nfs_open_context(ctx
, 0);
668 * Ensure that mmap has a recent RPC credential for use when writing out
671 static void nfs_file_set_open_context(struct file
*filp
, struct nfs_open_context
*ctx
)
673 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
674 struct nfs_inode
*nfsi
= NFS_I(inode
);
676 filp
->private_data
= get_nfs_open_context(ctx
);
677 spin_lock(&inode
->i_lock
);
678 list_add(&ctx
->list
, &nfsi
->open_files
);
679 spin_unlock(&inode
->i_lock
);
683 * Given an inode, search for an open context with the desired characteristics
685 struct nfs_open_context
*nfs_find_open_context(struct inode
*inode
, struct rpc_cred
*cred
, fmode_t mode
)
687 struct nfs_inode
*nfsi
= NFS_I(inode
);
688 struct nfs_open_context
*pos
, *ctx
= NULL
;
690 spin_lock(&inode
->i_lock
);
691 list_for_each_entry(pos
, &nfsi
->open_files
, list
) {
692 if (cred
!= NULL
&& pos
->cred
!= cred
)
694 if ((pos
->mode
& (FMODE_READ
|FMODE_WRITE
)) != mode
)
696 ctx
= get_nfs_open_context(pos
);
699 spin_unlock(&inode
->i_lock
);
703 static void nfs_file_clear_open_context(struct file
*filp
)
705 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
706 struct nfs_open_context
*ctx
= nfs_file_open_context(filp
);
709 filp
->private_data
= NULL
;
710 spin_lock(&inode
->i_lock
);
711 list_move_tail(&ctx
->list
, &NFS_I(inode
)->open_files
);
712 spin_unlock(&inode
->i_lock
);
713 __put_nfs_open_context(ctx
, filp
->f_flags
& O_DIRECT
? 0 : 1);
718 * These allocate and release file read/write context information.
720 int nfs_open(struct inode
*inode
, struct file
*filp
)
722 struct nfs_open_context
*ctx
;
723 struct rpc_cred
*cred
;
725 cred
= rpc_lookup_cred();
727 return PTR_ERR(cred
);
728 ctx
= alloc_nfs_open_context(&filp
->f_path
, cred
);
732 ctx
->mode
= filp
->f_mode
;
733 nfs_file_set_open_context(filp
, ctx
);
734 put_nfs_open_context(ctx
);
735 nfs_fscache_set_inode_cookie(inode
, filp
);
739 int nfs_release(struct inode
*inode
, struct file
*filp
)
741 nfs_file_clear_open_context(filp
);
746 * This function is called whenever some part of NFS notices that
747 * the cached attributes have to be refreshed.
750 __nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
752 int status
= -ESTALE
;
753 struct nfs_fattr
*fattr
= NULL
;
754 struct nfs_inode
*nfsi
= NFS_I(inode
);
756 dfprintk(PAGECACHE
, "NFS: revalidating (%s/%Ld)\n",
757 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
759 if (is_bad_inode(inode
))
761 if (NFS_STALE(inode
))
765 fattr
= nfs_alloc_fattr();
769 nfs_inc_stats(inode
, NFSIOS_INODEREVALIDATE
);
770 status
= NFS_PROTO(inode
)->getattr(server
, NFS_FH(inode
), fattr
);
772 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
774 (long long)NFS_FILEID(inode
), status
);
775 if (status
== -ESTALE
) {
776 nfs_zap_caches(inode
);
777 if (!S_ISDIR(inode
->i_mode
))
778 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
783 status
= nfs_refresh_inode(inode
, fattr
);
785 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
787 (long long)NFS_FILEID(inode
), status
);
791 if (nfsi
->cache_validity
& NFS_INO_INVALID_ACL
)
792 nfs_zap_acl_cache(inode
);
794 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) revalidation complete\n",
796 (long long)NFS_FILEID(inode
));
799 nfs_free_fattr(fattr
);
803 int nfs_attribute_timeout(struct inode
*inode
)
805 struct nfs_inode
*nfsi
= NFS_I(inode
);
807 return !time_in_range_open(jiffies
, nfsi
->read_cache_jiffies
, nfsi
->read_cache_jiffies
+ nfsi
->attrtimeo
);
810 static int nfs_attribute_cache_expired(struct inode
*inode
)
812 if (nfs_have_delegated_attributes(inode
))
814 return nfs_attribute_timeout(inode
);
818 * nfs_revalidate_inode - Revalidate the inode attributes
819 * @server - pointer to nfs_server struct
820 * @inode - pointer to inode struct
822 * Updates inode attribute information by retrieving the data from the server.
824 int nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
826 if (!(NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_ATTR
)
827 && !nfs_attribute_cache_expired(inode
))
828 return NFS_STALE(inode
) ? -ESTALE
: 0;
829 return __nfs_revalidate_inode(server
, inode
);
832 static int nfs_invalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
834 struct nfs_inode
*nfsi
= NFS_I(inode
);
836 if (mapping
->nrpages
!= 0) {
837 int ret
= invalidate_inode_pages2(mapping
);
841 spin_lock(&inode
->i_lock
);
842 nfsi
->cache_validity
&= ~NFS_INO_INVALID_DATA
;
843 if (S_ISDIR(inode
->i_mode
))
844 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
845 spin_unlock(&inode
->i_lock
);
846 nfs_inc_stats(inode
, NFSIOS_DATAINVALIDATE
);
847 nfs_fscache_reset_inode_cookie(inode
);
848 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) data cache invalidated\n",
849 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
854 * nfs_revalidate_mapping - Revalidate the pagecache
855 * @inode - pointer to host inode
856 * @mapping - pointer to mapping
858 int nfs_revalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
860 struct nfs_inode
*nfsi
= NFS_I(inode
);
863 if ((nfsi
->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
864 || nfs_attribute_cache_expired(inode
)
865 || NFS_STALE(inode
)) {
866 ret
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
870 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
)
871 ret
= nfs_invalidate_mapping(inode
, mapping
);
876 static void nfs_wcc_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
878 struct nfs_inode
*nfsi
= NFS_I(inode
);
880 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
)
881 && (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
882 && nfsi
->change_attr
== fattr
->pre_change_attr
) {
883 nfsi
->change_attr
= fattr
->change_attr
;
884 if (S_ISDIR(inode
->i_mode
))
885 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
887 /* If we have atomic WCC data, we may update some attributes */
888 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
)
889 && (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
890 && timespec_equal(&inode
->i_ctime
, &fattr
->pre_ctime
))
891 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
893 if ((fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
)
894 && (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
895 && timespec_equal(&inode
->i_mtime
, &fattr
->pre_mtime
)) {
896 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
897 if (S_ISDIR(inode
->i_mode
))
898 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
900 if ((fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
)
901 && (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
902 && i_size_read(inode
) == nfs_size_to_loff_t(fattr
->pre_size
)
903 && nfsi
->npages
== 0)
904 i_size_write(inode
, nfs_size_to_loff_t(fattr
->size
));
908 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
909 * @inode - pointer to inode
910 * @fattr - updated attributes
912 * Verifies the attribute cache. If we have just changed the attributes,
913 * so that fattr carries weak cache consistency data, then it may
914 * also update the ctime/mtime/change_attribute.
916 static int nfs_check_inode_attributes(struct inode
*inode
, struct nfs_fattr
*fattr
)
918 struct nfs_inode
*nfsi
= NFS_I(inode
);
919 loff_t cur_size
, new_isize
;
920 unsigned long invalid
= 0;
923 /* Has the inode gone and changed behind our back? */
924 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
)
926 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
))
929 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
930 nfsi
->change_attr
!= fattr
->change_attr
)
931 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
933 /* Verify a few of the more important attributes */
934 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) && !timespec_equal(&inode
->i_mtime
, &fattr
->mtime
))
935 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
937 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
938 cur_size
= i_size_read(inode
);
939 new_isize
= nfs_size_to_loff_t(fattr
->size
);
940 if (cur_size
!= new_isize
&& nfsi
->npages
== 0)
941 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
944 /* Have any file permissions changed? */
945 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) && (inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
))
946 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
947 if ((fattr
->valid
& NFS_ATTR_FATTR_OWNER
) && inode
->i_uid
!= fattr
->uid
)
948 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
949 if ((fattr
->valid
& NFS_ATTR_FATTR_GROUP
) && inode
->i_gid
!= fattr
->gid
)
950 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
952 /* Has the link count changed? */
953 if ((fattr
->valid
& NFS_ATTR_FATTR_NLINK
) && inode
->i_nlink
!= fattr
->nlink
)
954 invalid
|= NFS_INO_INVALID_ATTR
;
956 if ((fattr
->valid
& NFS_ATTR_FATTR_ATIME
) && !timespec_equal(&inode
->i_atime
, &fattr
->atime
))
957 invalid
|= NFS_INO_INVALID_ATIME
;
960 nfsi
->cache_validity
|= invalid
;
962 nfsi
->read_cache_jiffies
= fattr
->time_start
;
966 static int nfs_ctime_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
968 if (!(fattr
->valid
& NFS_ATTR_FATTR_CTIME
))
970 return timespec_compare(&fattr
->ctime
, &inode
->i_ctime
) > 0;
973 static int nfs_size_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
975 if (!(fattr
->valid
& NFS_ATTR_FATTR_SIZE
))
977 return nfs_size_to_loff_t(fattr
->size
) > i_size_read(inode
);
980 static atomic_long_t nfs_attr_generation_counter
;
982 static unsigned long nfs_read_attr_generation_counter(void)
984 return atomic_long_read(&nfs_attr_generation_counter
);
987 unsigned long nfs_inc_attr_generation_counter(void)
989 return atomic_long_inc_return(&nfs_attr_generation_counter
);
992 void nfs_fattr_init(struct nfs_fattr
*fattr
)
995 fattr
->time_start
= jiffies
;
996 fattr
->gencount
= nfs_inc_attr_generation_counter();
999 struct nfs_fattr
*nfs_alloc_fattr(void)
1001 struct nfs_fattr
*fattr
;
1003 fattr
= kmalloc(sizeof(*fattr
), GFP_NOFS
);
1005 nfs_fattr_init(fattr
);
1009 struct nfs_fh
*nfs_alloc_fhandle(void)
1013 fh
= kmalloc(sizeof(struct nfs_fh
), GFP_NOFS
);
1020 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1021 * @inode - pointer to inode
1022 * @fattr - attributes
1024 * Attempt to divine whether or not an RPC call reply carrying stale
1025 * attributes got scheduled after another call carrying updated ones.
1027 * To do so, the function first assumes that a more recent ctime means
1028 * that the attributes in fattr are newer, however it also attempt to
1029 * catch the case where ctime either didn't change, or went backwards
1030 * (if someone reset the clock on the server) by looking at whether
1031 * or not this RPC call was started after the inode was last updated.
1032 * Note also the check for wraparound of 'attr_gencount'
1034 * The function returns 'true' if it thinks the attributes in 'fattr' are
1035 * more recent than the ones cached in the inode.
1038 static int nfs_inode_attrs_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1040 const struct nfs_inode
*nfsi
= NFS_I(inode
);
1042 return ((long)fattr
->gencount
- (long)nfsi
->attr_gencount
) > 0 ||
1043 nfs_ctime_need_update(inode
, fattr
) ||
1044 nfs_size_need_update(inode
, fattr
) ||
1045 ((long)nfsi
->attr_gencount
- (long)nfs_read_attr_generation_counter() > 0);
1048 static int nfs_refresh_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1050 if (nfs_inode_attrs_need_update(inode
, fattr
))
1051 return nfs_update_inode(inode
, fattr
);
1052 return nfs_check_inode_attributes(inode
, fattr
);
1056 * nfs_refresh_inode - try to update the inode attribute cache
1057 * @inode - pointer to inode
1058 * @fattr - updated attributes
1060 * Check that an RPC call that returned attributes has not overlapped with
1061 * other recent updates of the inode metadata, then decide whether it is
1062 * safe to do a full update of the inode attributes, or whether just to
1063 * call nfs_check_inode_attributes.
1065 int nfs_refresh_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1069 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1071 spin_lock(&inode
->i_lock
);
1072 status
= nfs_refresh_inode_locked(inode
, fattr
);
1073 spin_unlock(&inode
->i_lock
);
1078 static int nfs_post_op_update_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1080 struct nfs_inode
*nfsi
= NFS_I(inode
);
1082 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1083 if (S_ISDIR(inode
->i_mode
))
1084 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
1085 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1087 return nfs_refresh_inode_locked(inode
, fattr
);
1091 * nfs_post_op_update_inode - try to update the inode attribute cache
1092 * @inode - pointer to inode
1093 * @fattr - updated attributes
1095 * After an operation that has changed the inode metadata, mark the
1096 * attribute cache as being invalid, then try to update it.
1098 * NB: if the server didn't return any post op attributes, this
1099 * function will force the retrieval of attributes before the next
1100 * NFS request. Thus it should be used only for operations that
1101 * are expected to change one or more attributes, to avoid
1102 * unnecessary NFS requests and trips through nfs_update_inode().
1104 int nfs_post_op_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1108 spin_lock(&inode
->i_lock
);
1109 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1110 spin_unlock(&inode
->i_lock
);
1115 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1116 * @inode - pointer to inode
1117 * @fattr - updated attributes
1119 * After an operation that has changed the inode metadata, mark the
1120 * attribute cache as being invalid, then try to update it. Fake up
1121 * weak cache consistency data, if none exist.
1123 * This function is mainly designed to be used by the ->write_done() functions.
1125 int nfs_post_op_update_inode_force_wcc(struct inode
*inode
, struct nfs_fattr
*fattr
)
1129 spin_lock(&inode
->i_lock
);
1130 /* Don't do a WCC update if these attributes are already stale */
1131 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0 ||
1132 !nfs_inode_attrs_need_update(inode
, fattr
)) {
1133 fattr
->valid
&= ~(NFS_ATTR_FATTR_PRECHANGE
1134 | NFS_ATTR_FATTR_PRESIZE
1135 | NFS_ATTR_FATTR_PREMTIME
1136 | NFS_ATTR_FATTR_PRECTIME
);
1139 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
1140 (fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
) == 0) {
1141 fattr
->pre_change_attr
= NFS_I(inode
)->change_attr
;
1142 fattr
->valid
|= NFS_ATTR_FATTR_PRECHANGE
;
1144 if ((fattr
->valid
& NFS_ATTR_FATTR_CTIME
) != 0 &&
1145 (fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
) == 0) {
1146 memcpy(&fattr
->pre_ctime
, &inode
->i_ctime
, sizeof(fattr
->pre_ctime
));
1147 fattr
->valid
|= NFS_ATTR_FATTR_PRECTIME
;
1149 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) != 0 &&
1150 (fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
) == 0) {
1151 memcpy(&fattr
->pre_mtime
, &inode
->i_mtime
, sizeof(fattr
->pre_mtime
));
1152 fattr
->valid
|= NFS_ATTR_FATTR_PREMTIME
;
1154 if ((fattr
->valid
& NFS_ATTR_FATTR_SIZE
) != 0 &&
1155 (fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
) == 0) {
1156 fattr
->pre_size
= i_size_read(inode
);
1157 fattr
->valid
|= NFS_ATTR_FATTR_PRESIZE
;
1160 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1161 spin_unlock(&inode
->i_lock
);
1166 * Many nfs protocol calls return the new file attributes after
1167 * an operation. Here we update the inode to reflect the state
1168 * of the server's inode.
1170 * This is a bit tricky because we have to make sure all dirty pages
1171 * have been sent off to the server before calling invalidate_inode_pages.
1172 * To make sure no other process adds more write requests while we try
1173 * our best to flush them, we make them sleep during the attribute refresh.
1175 * A very similar scenario holds for the dir cache.
1177 static int nfs_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1179 struct nfs_server
*server
;
1180 struct nfs_inode
*nfsi
= NFS_I(inode
);
1181 loff_t cur_isize
, new_isize
;
1182 unsigned long invalid
= 0;
1183 unsigned long now
= jiffies
;
1184 unsigned long save_cache_validity
;
1186 dfprintk(VFS
, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1187 __func__
, inode
->i_sb
->s_id
, inode
->i_ino
,
1188 atomic_read(&inode
->i_count
), fattr
->valid
);
1190 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
)
1194 * Make sure the inode's type hasn't changed.
1196 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
))
1199 server
= NFS_SERVER(inode
);
1200 /* Update the fsid? */
1201 if (S_ISDIR(inode
->i_mode
) && (fattr
->valid
& NFS_ATTR_FATTR_FSID
) &&
1202 !nfs_fsid_equal(&server
->fsid
, &fattr
->fsid
) &&
1203 !test_bit(NFS_INO_MOUNTPOINT
, &nfsi
->flags
))
1204 server
->fsid
= fattr
->fsid
;
1207 * Update the read time so we don't revalidate too often.
1209 nfsi
->read_cache_jiffies
= fattr
->time_start
;
1211 save_cache_validity
= nfsi
->cache_validity
;
1212 nfsi
->cache_validity
&= ~(NFS_INO_INVALID_ATTR
1213 | NFS_INO_INVALID_ATIME
1214 | NFS_INO_REVAL_FORCED
1215 | NFS_INO_REVAL_PAGECACHE
);
1217 /* Do atomic weak cache consistency updates */
1218 nfs_wcc_update_inode(inode
, fattr
);
1220 /* More cache consistency checks */
1221 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) {
1222 if (nfsi
->change_attr
!= fattr
->change_attr
) {
1223 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1224 inode
->i_sb
->s_id
, inode
->i_ino
);
1225 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1226 if (S_ISDIR(inode
->i_mode
))
1227 nfs_force_lookup_revalidate(inode
);
1228 nfsi
->change_attr
= fattr
->change_attr
;
1230 } else if (server
->caps
& NFS_CAP_CHANGE_ATTR
)
1231 invalid
|= save_cache_validity
;
1233 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
) {
1234 /* NFSv2/v3: Check if the mtime agrees */
1235 if (!timespec_equal(&inode
->i_mtime
, &fattr
->mtime
)) {
1236 dprintk("NFS: mtime change on server for file %s/%ld\n",
1237 inode
->i_sb
->s_id
, inode
->i_ino
);
1238 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
;
1239 if (S_ISDIR(inode
->i_mode
))
1240 nfs_force_lookup_revalidate(inode
);
1241 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1243 } else if (server
->caps
& NFS_CAP_MTIME
)
1244 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1245 | NFS_INO_INVALID_DATA
1246 | NFS_INO_REVAL_PAGECACHE
1247 | NFS_INO_REVAL_FORCED
);
1249 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
) {
1250 /* If ctime has changed we should definitely clear access+acl caches */
1251 if (!timespec_equal(&inode
->i_ctime
, &fattr
->ctime
)) {
1252 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1253 /* and probably clear data for a directory too as utimes can cause
1254 * havoc with our cache.
1256 if (S_ISDIR(inode
->i_mode
)) {
1257 invalid
|= NFS_INO_INVALID_DATA
;
1258 nfs_force_lookup_revalidate(inode
);
1260 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1262 } else if (server
->caps
& NFS_CAP_CTIME
)
1263 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1264 | NFS_INO_INVALID_ACCESS
1265 | NFS_INO_INVALID_ACL
1266 | NFS_INO_REVAL_FORCED
);
1268 /* Check if our cached file size is stale */
1269 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
1270 new_isize
= nfs_size_to_loff_t(fattr
->size
);
1271 cur_isize
= i_size_read(inode
);
1272 if (new_isize
!= cur_isize
) {
1273 /* Do we perhaps have any outstanding writes, or has
1274 * the file grown beyond our last write? */
1275 if (nfsi
->npages
== 0 || new_isize
> cur_isize
) {
1276 i_size_write(inode
, new_isize
);
1277 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
;
1279 dprintk("NFS: isize change on server for file %s/%ld\n",
1280 inode
->i_sb
->s_id
, inode
->i_ino
);
1283 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1284 | NFS_INO_REVAL_PAGECACHE
1285 | NFS_INO_REVAL_FORCED
);
1288 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
1289 memcpy(&inode
->i_atime
, &fattr
->atime
, sizeof(inode
->i_atime
));
1290 else if (server
->caps
& NFS_CAP_ATIME
)
1291 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATIME
1292 | NFS_INO_REVAL_FORCED
);
1294 if (fattr
->valid
& NFS_ATTR_FATTR_MODE
) {
1295 if ((inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
)) {
1296 umode_t newmode
= inode
->i_mode
& S_IFMT
;
1297 newmode
|= fattr
->mode
& S_IALLUGO
;
1298 inode
->i_mode
= newmode
;
1299 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1301 } else if (server
->caps
& NFS_CAP_MODE
)
1302 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1303 | NFS_INO_INVALID_ACCESS
1304 | NFS_INO_INVALID_ACL
1305 | NFS_INO_REVAL_FORCED
);
1307 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
) {
1308 if (inode
->i_uid
!= fattr
->uid
) {
1309 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1310 inode
->i_uid
= fattr
->uid
;
1312 } else if (server
->caps
& NFS_CAP_OWNER
)
1313 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1314 | NFS_INO_INVALID_ACCESS
1315 | NFS_INO_INVALID_ACL
1316 | NFS_INO_REVAL_FORCED
);
1318 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
) {
1319 if (inode
->i_gid
!= fattr
->gid
) {
1320 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1321 inode
->i_gid
= fattr
->gid
;
1323 } else if (server
->caps
& NFS_CAP_OWNER_GROUP
)
1324 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1325 | NFS_INO_INVALID_ACCESS
1326 | NFS_INO_INVALID_ACL
1327 | NFS_INO_REVAL_FORCED
);
1329 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
) {
1330 if (inode
->i_nlink
!= fattr
->nlink
) {
1331 invalid
|= NFS_INO_INVALID_ATTR
;
1332 if (S_ISDIR(inode
->i_mode
))
1333 invalid
|= NFS_INO_INVALID_DATA
;
1334 inode
->i_nlink
= fattr
->nlink
;
1336 } else if (server
->caps
& NFS_CAP_NLINK
)
1337 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1338 | NFS_INO_REVAL_FORCED
);
1340 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
1342 * report the blocks in 512byte units
1344 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
1346 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
1347 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
1349 /* Update attrtimeo value if we're out of the unstable period */
1350 if (invalid
& NFS_INO_INVALID_ATTR
) {
1351 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
1352 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
1353 nfsi
->attrtimeo_timestamp
= now
;
1354 nfsi
->attr_gencount
= nfs_inc_attr_generation_counter();
1356 if (!time_in_range_open(now
, nfsi
->attrtimeo_timestamp
, nfsi
->attrtimeo_timestamp
+ nfsi
->attrtimeo
)) {
1357 if ((nfsi
->attrtimeo
<<= 1) > NFS_MAXATTRTIMEO(inode
))
1358 nfsi
->attrtimeo
= NFS_MAXATTRTIMEO(inode
);
1359 nfsi
->attrtimeo_timestamp
= now
;
1362 invalid
&= ~NFS_INO_INVALID_ATTR
;
1363 /* Don't invalidate the data if we were to blame */
1364 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
)
1365 || S_ISLNK(inode
->i_mode
)))
1366 invalid
&= ~NFS_INO_INVALID_DATA
;
1367 if (!nfs_have_delegation(inode
, FMODE_READ
) ||
1368 (save_cache_validity
& NFS_INO_REVAL_FORCED
))
1369 nfsi
->cache_validity
|= invalid
;
1374 * Big trouble! The inode has become a different object.
1376 printk(KERN_DEBUG
"%s: inode %ld mode changed, %07o to %07o\n",
1377 __func__
, inode
->i_ino
, inode
->i_mode
, fattr
->mode
);
1380 * No need to worry about unhashing the dentry, as the
1381 * lookup validation will know that the inode is bad.
1382 * (But we fall through to invalidate the caches.)
1384 nfs_invalidate_inode(inode
);
1388 printk(KERN_ERR
"NFS: server %s error: fileid changed\n"
1389 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1390 NFS_SERVER(inode
)->nfs_client
->cl_hostname
, inode
->i_sb
->s_id
,
1391 (long long)nfsi
->fileid
, (long long)fattr
->fileid
);
1396 #ifdef CONFIG_NFS_V4
1399 * Clean out any remaining NFSv4 state that might be left over due
1400 * to open() calls that passed nfs_atomic_lookup, but failed to call
1403 void nfs4_clear_inode(struct inode
*inode
)
1405 /* If we are holding a delegation, return it! */
1406 nfs_inode_return_delegation_noreclaim(inode
);
1407 /* First call standard NFS clear_inode() code */
1408 nfs_clear_inode(inode
);
1412 struct inode
*nfs_alloc_inode(struct super_block
*sb
)
1414 struct nfs_inode
*nfsi
;
1415 nfsi
= (struct nfs_inode
*)kmem_cache_alloc(nfs_inode_cachep
, GFP_KERNEL
);
1419 nfsi
->cache_validity
= 0UL;
1420 #ifdef CONFIG_NFS_V3_ACL
1421 nfsi
->acl_access
= ERR_PTR(-EAGAIN
);
1422 nfsi
->acl_default
= ERR_PTR(-EAGAIN
);
1424 #ifdef CONFIG_NFS_V4
1425 nfsi
->nfs4_acl
= NULL
;
1426 #endif /* CONFIG_NFS_V4 */
1427 return &nfsi
->vfs_inode
;
1430 void nfs_destroy_inode(struct inode
*inode
)
1432 kmem_cache_free(nfs_inode_cachep
, NFS_I(inode
));
1435 static inline void nfs4_init_once(struct nfs_inode
*nfsi
)
1437 #ifdef CONFIG_NFS_V4
1438 INIT_LIST_HEAD(&nfsi
->open_states
);
1439 nfsi
->delegation
= NULL
;
1440 nfsi
->delegation_state
= 0;
1441 init_rwsem(&nfsi
->rwsem
);
1445 static void init_once(void *foo
)
1447 struct nfs_inode
*nfsi
= (struct nfs_inode
*) foo
;
1449 inode_init_once(&nfsi
->vfs_inode
);
1450 INIT_LIST_HEAD(&nfsi
->open_files
);
1451 INIT_LIST_HEAD(&nfsi
->access_cache_entry_lru
);
1452 INIT_LIST_HEAD(&nfsi
->access_cache_inode_lru
);
1453 INIT_RADIX_TREE(&nfsi
->nfs_page_tree
, GFP_ATOMIC
);
1456 atomic_set(&nfsi
->silly_count
, 1);
1457 INIT_HLIST_HEAD(&nfsi
->silly_list
);
1458 init_waitqueue_head(&nfsi
->waitqueue
);
1459 nfs4_init_once(nfsi
);
1462 static int __init
nfs_init_inodecache(void)
1464 nfs_inode_cachep
= kmem_cache_create("nfs_inode_cache",
1465 sizeof(struct nfs_inode
),
1466 0, (SLAB_RECLAIM_ACCOUNT
|
1469 if (nfs_inode_cachep
== NULL
)
1475 static void nfs_destroy_inodecache(void)
1477 kmem_cache_destroy(nfs_inode_cachep
);
1480 struct workqueue_struct
*nfsiod_workqueue
;
1483 * start up the nfsiod workqueue
1485 static int nfsiod_start(void)
1487 struct workqueue_struct
*wq
;
1488 dprintk("RPC: creating workqueue nfsiod\n");
1489 wq
= create_singlethread_workqueue("nfsiod");
1492 nfsiod_workqueue
= wq
;
1497 * Destroy the nfsiod workqueue
1499 static void nfsiod_stop(void)
1501 struct workqueue_struct
*wq
;
1503 wq
= nfsiod_workqueue
;
1506 nfsiod_workqueue
= NULL
;
1507 destroy_workqueue(wq
);
1513 static int __init
init_nfs_fs(void)
1517 err
= nfs_dns_resolver_init();
1521 err
= nfs_fscache_register();
1525 err
= nfsiod_start();
1529 err
= nfs_fs_proc_init();
1533 err
= nfs_init_nfspagecache();
1537 err
= nfs_init_inodecache();
1541 err
= nfs_init_readpagecache();
1545 err
= nfs_init_writepagecache();
1549 err
= nfs_init_directcache();
1553 #ifdef CONFIG_PROC_FS
1554 rpc_proc_register(&nfs_rpcstat
);
1556 if ((err
= register_nfs_fs()) != 0)
1560 #ifdef CONFIG_PROC_FS
1561 rpc_proc_unregister("nfs");
1563 nfs_destroy_directcache();
1565 nfs_destroy_writepagecache();
1567 nfs_destroy_readpagecache();
1569 nfs_destroy_inodecache();
1571 nfs_destroy_nfspagecache();
1577 nfs_fscache_unregister();
1579 nfs_dns_resolver_destroy();
1584 static void __exit
exit_nfs_fs(void)
1586 nfs_destroy_directcache();
1587 nfs_destroy_writepagecache();
1588 nfs_destroy_readpagecache();
1589 nfs_destroy_inodecache();
1590 nfs_destroy_nfspagecache();
1591 nfs_fscache_unregister();
1592 nfs_dns_resolver_destroy();
1593 #ifdef CONFIG_PROC_FS
1594 rpc_proc_unregister("nfs");
1596 unregister_nfs_fs();
1601 /* Not quite true; I just maintain it */
1602 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1603 MODULE_LICENSE("GPL");
1604 module_param(enable_ino64
, bool, 0644);
1606 module_init(init_nfs_fs
)
1607 module_exit(exit_nfs_fs
)