4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, 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/smp_lock.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/nfs_idmap.h>
37 #include <linux/vfs.h>
38 #include <linux/inet.h>
39 #include <linux/nfs_xdr.h>
41 #include <asm/system.h>
42 #include <asm/uaccess.h>
46 #include "delegation.h"
50 #define NFSDBG_FACILITY NFSDBG_VFS
52 static void nfs_invalidate_inode(struct inode
*);
53 static int nfs_update_inode(struct inode
*, struct nfs_fattr
*);
55 static void nfs_zap_acl_cache(struct inode
*);
57 static struct kmem_cache
* nfs_inode_cachep
;
59 static inline unsigned long
60 nfs_fattr_to_ino_t(struct nfs_fattr
*fattr
)
62 return nfs_fileid_to_ino_t(fattr
->fileid
);
65 int nfs_write_inode(struct inode
*inode
, int sync
)
70 ret
= filemap_fdatawait(inode
->i_mapping
);
72 ret
= nfs_commit_inode(inode
, FLUSH_SYNC
);
74 ret
= nfs_commit_inode(inode
, 0);
77 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
81 void nfs_clear_inode(struct inode
*inode
)
84 * The following should never happen...
86 BUG_ON(nfs_have_writebacks(inode
));
87 BUG_ON(!list_empty(&NFS_I(inode
)->open_files
));
88 nfs_zap_acl_cache(inode
);
89 nfs_access_zap_cache(inode
);
93 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
95 int nfs_sync_mapping(struct address_space
*mapping
)
99 if (mapping
->nrpages
== 0)
101 unmap_mapping_range(mapping
, 0, 0, 0);
102 ret
= filemap_write_and_wait(mapping
);
105 ret
= nfs_wb_all(mapping
->host
);
111 * Invalidate the local caches
113 static void nfs_zap_caches_locked(struct inode
*inode
)
115 struct nfs_inode
*nfsi
= NFS_I(inode
);
116 int mode
= inode
->i_mode
;
118 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
120 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
121 nfsi
->attrtimeo_timestamp
= jiffies
;
123 memset(NFS_COOKIEVERF(inode
), 0, sizeof(NFS_COOKIEVERF(inode
)));
124 if (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
))
125 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
|NFS_INO_REVAL_PAGECACHE
;
127 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
|NFS_INO_REVAL_PAGECACHE
;
130 void nfs_zap_caches(struct inode
*inode
)
132 spin_lock(&inode
->i_lock
);
133 nfs_zap_caches_locked(inode
);
134 spin_unlock(&inode
->i_lock
);
137 void nfs_zap_mapping(struct inode
*inode
, struct address_space
*mapping
)
139 if (mapping
->nrpages
!= 0) {
140 spin_lock(&inode
->i_lock
);
141 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_DATA
;
142 spin_unlock(&inode
->i_lock
);
146 static void nfs_zap_acl_cache(struct inode
*inode
)
148 void (*clear_acl_cache
)(struct inode
*);
150 clear_acl_cache
= NFS_PROTO(inode
)->clear_acl_cache
;
151 if (clear_acl_cache
!= NULL
)
152 clear_acl_cache(inode
);
153 spin_lock(&inode
->i_lock
);
154 NFS_I(inode
)->cache_validity
&= ~NFS_INO_INVALID_ACL
;
155 spin_unlock(&inode
->i_lock
);
158 void nfs_invalidate_atime(struct inode
*inode
)
160 spin_lock(&inode
->i_lock
);
161 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ATIME
;
162 spin_unlock(&inode
->i_lock
);
166 * Invalidate, but do not unhash, the inode.
167 * NB: must be called with inode->i_lock held!
169 static void nfs_invalidate_inode(struct inode
*inode
)
171 set_bit(NFS_INO_STALE
, &NFS_FLAGS(inode
));
172 nfs_zap_caches_locked(inode
);
175 struct nfs_find_desc
{
177 struct nfs_fattr
*fattr
;
181 * In NFSv3 we can have 64bit inode numbers. In order to support
182 * this, and re-exported directories (also seen in NFSv2)
183 * we are forced to allow 2 different inodes to have the same
187 nfs_find_actor(struct inode
*inode
, void *opaque
)
189 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
190 struct nfs_fh
*fh
= desc
->fh
;
191 struct nfs_fattr
*fattr
= desc
->fattr
;
193 if (NFS_FILEID(inode
) != fattr
->fileid
)
195 if (nfs_compare_fh(NFS_FH(inode
), fh
))
197 if (is_bad_inode(inode
) || NFS_STALE(inode
))
203 nfs_init_locked(struct inode
*inode
, void *opaque
)
205 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
206 struct nfs_fattr
*fattr
= desc
->fattr
;
208 NFS_FILEID(inode
) = fattr
->fileid
;
209 nfs_copy_fh(NFS_FH(inode
), desc
->fh
);
213 /* Don't use READDIRPLUS on directories that we believe are too large */
214 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
217 * This is our front-end to iget that looks up inodes by file handle
218 * instead of inode number.
221 nfs_fhget(struct super_block
*sb
, struct nfs_fh
*fh
, struct nfs_fattr
*fattr
)
223 struct nfs_find_desc desc
= {
227 struct inode
*inode
= ERR_PTR(-ENOENT
);
230 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
234 printk("NFS: Buggy server - nlink == 0!\n");
238 hash
= nfs_fattr_to_ino_t(fattr
);
240 inode
= iget5_locked(sb
, hash
, nfs_find_actor
, nfs_init_locked
, &desc
);
242 inode
= ERR_PTR(-ENOMEM
);
246 if (inode
->i_state
& I_NEW
) {
247 struct nfs_inode
*nfsi
= NFS_I(inode
);
248 unsigned long now
= jiffies
;
250 /* We set i_ino for the few things that still rely on it,
254 /* We can't support update_atime(), since the server will reset it */
255 inode
->i_flags
|= S_NOATIME
|S_NOCMTIME
;
256 inode
->i_mode
= fattr
->mode
;
257 /* Why so? Because we want revalidate for devices/FIFOs, and
258 * that's precisely what we have in nfs_file_inode_operations.
260 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_inode_ops
;
261 if (S_ISREG(inode
->i_mode
)) {
262 inode
->i_fop
= &nfs_file_operations
;
263 inode
->i_data
.a_ops
= &nfs_file_aops
;
264 inode
->i_data
.backing_dev_info
= &NFS_SB(sb
)->backing_dev_info
;
265 } else if (S_ISDIR(inode
->i_mode
)) {
266 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->dir_inode_ops
;
267 inode
->i_fop
= &nfs_dir_operations
;
268 if (nfs_server_capable(inode
, NFS_CAP_READDIRPLUS
)
269 && fattr
->size
<= NFS_LIMIT_READDIRPLUS
)
270 set_bit(NFS_INO_ADVISE_RDPLUS
, &NFS_FLAGS(inode
));
271 /* Deal with crossing mountpoints */
272 if (!nfs_fsid_equal(&NFS_SB(sb
)->fsid
, &fattr
->fsid
)) {
273 if (fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
)
274 inode
->i_op
= &nfs_referral_inode_operations
;
276 inode
->i_op
= &nfs_mountpoint_inode_operations
;
279 } else if (S_ISLNK(inode
->i_mode
))
280 inode
->i_op
= &nfs_symlink_inode_operations
;
282 init_special_inode(inode
, inode
->i_mode
, fattr
->rdev
);
284 nfsi
->read_cache_jiffies
= fattr
->time_start
;
285 nfsi
->last_updated
= now
;
286 nfsi
->cache_change_attribute
= now
;
287 inode
->i_atime
= fattr
->atime
;
288 inode
->i_mtime
= fattr
->mtime
;
289 inode
->i_ctime
= fattr
->ctime
;
290 if (fattr
->valid
& NFS_ATTR_FATTR_V4
)
291 nfsi
->change_attr
= fattr
->change_attr
;
292 inode
->i_size
= nfs_size_to_loff_t(fattr
->size
);
293 inode
->i_nlink
= fattr
->nlink
;
294 inode
->i_uid
= fattr
->uid
;
295 inode
->i_gid
= fattr
->gid
;
296 if (fattr
->valid
& (NFS_ATTR_FATTR_V3
| NFS_ATTR_FATTR_V4
)) {
298 * report the blocks in 512byte units
300 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
302 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
304 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
305 nfsi
->attrtimeo_timestamp
= now
;
306 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
307 nfsi
->access_cache
= RB_ROOT
;
309 unlock_new_inode(inode
);
311 nfs_refresh_inode(inode
, fattr
);
312 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
314 (long long)NFS_FILEID(inode
),
315 atomic_read(&inode
->i_count
));
321 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode
));
325 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
328 nfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
330 struct inode
*inode
= dentry
->d_inode
;
331 struct nfs_fattr fattr
;
334 nfs_inc_stats(inode
, NFSIOS_VFSSETATTR
);
336 if (attr
->ia_valid
& ATTR_SIZE
) {
337 if (!S_ISREG(inode
->i_mode
) || attr
->ia_size
== i_size_read(inode
))
338 attr
->ia_valid
&= ~ATTR_SIZE
;
341 /* Optimization: if the end result is no change, don't RPC */
342 attr
->ia_valid
&= NFS_VALID_ATTRS
;
343 if (attr
->ia_valid
== 0)
347 /* Write all dirty data */
348 if (S_ISREG(inode
->i_mode
)) {
349 filemap_write_and_wait(inode
->i_mapping
);
353 * Return any delegations if we're going to change ACLs
355 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0)
356 nfs_inode_return_delegation(inode
);
357 error
= NFS_PROTO(inode
)->setattr(dentry
, &fattr
, attr
);
359 nfs_refresh_inode(inode
, &fattr
);
365 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
366 * @inode: pointer to struct inode
367 * @attr: pointer to struct iattr
369 * Note: we do this in the *proc.c in order to ensure that
370 * it works for things like exclusive creates too.
372 void nfs_setattr_update_inode(struct inode
*inode
, struct iattr
*attr
)
374 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0) {
375 if ((attr
->ia_valid
& ATTR_MODE
) != 0) {
376 int mode
= attr
->ia_mode
& S_IALLUGO
;
377 mode
|= inode
->i_mode
& ~S_IALLUGO
;
378 inode
->i_mode
= mode
;
380 if ((attr
->ia_valid
& ATTR_UID
) != 0)
381 inode
->i_uid
= attr
->ia_uid
;
382 if ((attr
->ia_valid
& ATTR_GID
) != 0)
383 inode
->i_gid
= attr
->ia_gid
;
384 spin_lock(&inode
->i_lock
);
385 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
386 spin_unlock(&inode
->i_lock
);
388 if ((attr
->ia_valid
& ATTR_SIZE
) != 0) {
389 nfs_inc_stats(inode
, NFSIOS_SETATTRTRUNC
);
390 inode
->i_size
= attr
->ia_size
;
391 vmtruncate(inode
, attr
->ia_size
);
395 static int nfs_wait_schedule(void *word
)
397 if (signal_pending(current
))
404 * Wait for the inode to get unlocked.
406 static int nfs_wait_on_inode(struct inode
*inode
)
408 struct rpc_clnt
*clnt
= NFS_CLIENT(inode
);
409 struct nfs_inode
*nfsi
= NFS_I(inode
);
413 rpc_clnt_sigmask(clnt
, &oldmask
);
414 error
= wait_on_bit_lock(&nfsi
->flags
, NFS_INO_REVALIDATING
,
415 nfs_wait_schedule
, TASK_INTERRUPTIBLE
);
416 rpc_clnt_sigunmask(clnt
, &oldmask
);
421 static void nfs_wake_up_inode(struct inode
*inode
)
423 struct nfs_inode
*nfsi
= NFS_I(inode
);
425 clear_bit(NFS_INO_REVALIDATING
, &nfsi
->flags
);
426 smp_mb__after_clear_bit();
427 wake_up_bit(&nfsi
->flags
, NFS_INO_REVALIDATING
);
430 int nfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
432 struct inode
*inode
= dentry
->d_inode
;
433 int need_atime
= NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_ATIME
;
436 /* Flush out writes to the server in order to update c/mtime */
437 if (S_ISREG(inode
->i_mode
))
438 nfs_wb_nocommit(inode
);
441 * We may force a getattr if the user cares about atime.
443 * Note that we only have to check the vfsmount flags here:
444 * - NFS always sets S_NOATIME by so checking it would give a
446 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
447 * no point in checking those.
449 if ((mnt
->mnt_flags
& MNT_NOATIME
) ||
450 ((mnt
->mnt_flags
& MNT_NODIRATIME
) && S_ISDIR(inode
->i_mode
)))
454 err
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
456 err
= nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
458 generic_fillattr(inode
, stat
);
459 stat
->ino
= NFS_FILEID(inode
);
464 static struct nfs_open_context
*alloc_nfs_open_context(struct vfsmount
*mnt
, struct dentry
*dentry
, struct rpc_cred
*cred
)
466 struct nfs_open_context
*ctx
;
468 ctx
= kmalloc(sizeof(*ctx
), GFP_KERNEL
);
470 ctx
->path
.dentry
= dget(dentry
);
471 ctx
->path
.mnt
= mntget(mnt
);
472 ctx
->cred
= get_rpccred(cred
);
474 ctx
->lockowner
= current
->files
;
477 atomic_set(&ctx
->count
, 1);
482 struct nfs_open_context
*get_nfs_open_context(struct nfs_open_context
*ctx
)
485 atomic_inc(&ctx
->count
);
489 void put_nfs_open_context(struct nfs_open_context
*ctx
)
491 struct inode
*inode
= ctx
->path
.dentry
->d_inode
;
493 if (!atomic_dec_and_lock(&ctx
->count
, &inode
->i_lock
))
495 list_del(&ctx
->list
);
496 spin_unlock(&inode
->i_lock
);
497 if (ctx
->state
!= NULL
)
498 nfs4_close_state(&ctx
->path
, ctx
->state
, ctx
->mode
);
499 if (ctx
->cred
!= NULL
)
500 put_rpccred(ctx
->cred
);
501 dput(ctx
->path
.dentry
);
502 mntput(ctx
->path
.mnt
);
507 * Ensure that mmap has a recent RPC credential for use when writing out
510 static void nfs_file_set_open_context(struct file
*filp
, struct nfs_open_context
*ctx
)
512 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
513 struct nfs_inode
*nfsi
= NFS_I(inode
);
515 filp
->private_data
= get_nfs_open_context(ctx
);
516 spin_lock(&inode
->i_lock
);
517 list_add(&ctx
->list
, &nfsi
->open_files
);
518 spin_unlock(&inode
->i_lock
);
522 * Given an inode, search for an open context with the desired characteristics
524 struct nfs_open_context
*nfs_find_open_context(struct inode
*inode
, struct rpc_cred
*cred
, int mode
)
526 struct nfs_inode
*nfsi
= NFS_I(inode
);
527 struct nfs_open_context
*pos
, *ctx
= NULL
;
529 spin_lock(&inode
->i_lock
);
530 list_for_each_entry(pos
, &nfsi
->open_files
, list
) {
531 if (cred
!= NULL
&& pos
->cred
!= cred
)
533 if ((pos
->mode
& mode
) == mode
) {
534 ctx
= get_nfs_open_context(pos
);
538 spin_unlock(&inode
->i_lock
);
542 static void nfs_file_clear_open_context(struct file
*filp
)
544 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
545 struct nfs_open_context
*ctx
= nfs_file_open_context(filp
);
548 filp
->private_data
= NULL
;
549 spin_lock(&inode
->i_lock
);
550 list_move_tail(&ctx
->list
, &NFS_I(inode
)->open_files
);
551 spin_unlock(&inode
->i_lock
);
552 put_nfs_open_context(ctx
);
557 * These allocate and release file read/write context information.
559 int nfs_open(struct inode
*inode
, struct file
*filp
)
561 struct nfs_open_context
*ctx
;
562 struct rpc_cred
*cred
;
564 cred
= rpcauth_lookupcred(NFS_CLIENT(inode
)->cl_auth
, 0);
566 return PTR_ERR(cred
);
567 ctx
= alloc_nfs_open_context(filp
->f_path
.mnt
, filp
->f_path
.dentry
, cred
);
571 ctx
->mode
= filp
->f_mode
;
572 nfs_file_set_open_context(filp
, ctx
);
573 put_nfs_open_context(ctx
);
577 int nfs_release(struct inode
*inode
, struct file
*filp
)
579 nfs_file_clear_open_context(filp
);
584 * This function is called whenever some part of NFS notices that
585 * the cached attributes have to be refreshed.
588 __nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
590 int status
= -ESTALE
;
591 struct nfs_fattr fattr
;
592 struct nfs_inode
*nfsi
= NFS_I(inode
);
594 dfprintk(PAGECACHE
, "NFS: revalidating (%s/%Ld)\n",
595 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
597 nfs_inc_stats(inode
, NFSIOS_INODEREVALIDATE
);
599 if (is_bad_inode(inode
))
601 if (NFS_STALE(inode
))
604 status
= nfs_wait_on_inode(inode
);
609 if (NFS_STALE(inode
))
612 status
= NFS_PROTO(inode
)->getattr(server
, NFS_FH(inode
), &fattr
);
614 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
616 (long long)NFS_FILEID(inode
), status
);
617 if (status
== -ESTALE
) {
618 nfs_zap_caches(inode
);
619 if (!S_ISDIR(inode
->i_mode
))
620 set_bit(NFS_INO_STALE
, &NFS_FLAGS(inode
));
625 spin_lock(&inode
->i_lock
);
626 status
= nfs_update_inode(inode
, &fattr
);
628 spin_unlock(&inode
->i_lock
);
629 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
631 (long long)NFS_FILEID(inode
), status
);
634 spin_unlock(&inode
->i_lock
);
636 if (nfsi
->cache_validity
& NFS_INO_INVALID_ACL
)
637 nfs_zap_acl_cache(inode
);
639 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) revalidation complete\n",
641 (long long)NFS_FILEID(inode
));
644 nfs_wake_up_inode(inode
);
651 int nfs_attribute_timeout(struct inode
*inode
)
653 struct nfs_inode
*nfsi
= NFS_I(inode
);
655 if (nfs_have_delegation(inode
, FMODE_READ
))
657 return !time_in_range(jiffies
, nfsi
->read_cache_jiffies
, nfsi
->read_cache_jiffies
+ nfsi
->attrtimeo
);
661 * nfs_revalidate_inode - Revalidate the inode attributes
662 * @server - pointer to nfs_server struct
663 * @inode - pointer to inode struct
665 * Updates inode attribute information by retrieving the data from the server.
667 int nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
669 if (!(NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_ATTR
)
670 && !nfs_attribute_timeout(inode
))
671 return NFS_STALE(inode
) ? -ESTALE
: 0;
672 return __nfs_revalidate_inode(server
, inode
);
675 static int nfs_invalidate_mapping_nolock(struct inode
*inode
, struct address_space
*mapping
)
677 struct nfs_inode
*nfsi
= NFS_I(inode
);
679 if (mapping
->nrpages
!= 0) {
680 int ret
= invalidate_inode_pages2(mapping
);
684 spin_lock(&inode
->i_lock
);
685 nfsi
->cache_validity
&= ~NFS_INO_INVALID_DATA
;
686 if (S_ISDIR(inode
->i_mode
))
687 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
688 spin_unlock(&inode
->i_lock
);
689 nfs_inc_stats(inode
, NFSIOS_DATAINVALIDATE
);
690 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) data cache invalidated\n",
691 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
695 static int nfs_invalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
699 mutex_lock(&inode
->i_mutex
);
700 if (NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_DATA
) {
701 ret
= nfs_sync_mapping(mapping
);
703 ret
= nfs_invalidate_mapping_nolock(inode
, mapping
);
705 mutex_unlock(&inode
->i_mutex
);
710 * nfs_revalidate_mapping_nolock - Revalidate the pagecache
711 * @inode - pointer to host inode
712 * @mapping - pointer to mapping
714 int nfs_revalidate_mapping_nolock(struct inode
*inode
, struct address_space
*mapping
)
716 struct nfs_inode
*nfsi
= NFS_I(inode
);
719 if ((nfsi
->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
720 || nfs_attribute_timeout(inode
) || NFS_STALE(inode
)) {
721 ret
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
725 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
)
726 ret
= nfs_invalidate_mapping_nolock(inode
, mapping
);
732 * nfs_revalidate_mapping - Revalidate the pagecache
733 * @inode - pointer to host inode
734 * @mapping - pointer to mapping
736 * This version of the function will take the inode->i_mutex and attempt to
737 * flush out all dirty data if it needs to invalidate the page cache.
739 int nfs_revalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
741 struct nfs_inode
*nfsi
= NFS_I(inode
);
744 if ((nfsi
->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
745 || nfs_attribute_timeout(inode
) || NFS_STALE(inode
)) {
746 ret
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
750 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
)
751 ret
= nfs_invalidate_mapping(inode
, mapping
);
756 static void nfs_wcc_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
758 struct nfs_inode
*nfsi
= NFS_I(inode
);
760 if ((fattr
->valid
& NFS_ATTR_WCC_V4
) != 0 &&
761 nfsi
->change_attr
== fattr
->pre_change_attr
) {
762 nfsi
->change_attr
= fattr
->change_attr
;
763 if (S_ISDIR(inode
->i_mode
))
764 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
766 /* If we have atomic WCC data, we may update some attributes */
767 if ((fattr
->valid
& NFS_ATTR_WCC
) != 0) {
768 if (timespec_equal(&inode
->i_ctime
, &fattr
->pre_ctime
))
769 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
770 if (timespec_equal(&inode
->i_mtime
, &fattr
->pre_mtime
)) {
771 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
772 if (S_ISDIR(inode
->i_mode
))
773 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
775 if (inode
->i_size
== fattr
->pre_size
&& nfsi
->npages
== 0)
776 inode
->i_size
= fattr
->size
;
781 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
782 * @inode - pointer to inode
783 * @fattr - updated attributes
785 * Verifies the attribute cache. If we have just changed the attributes,
786 * so that fattr carries weak cache consistency data, then it may
787 * also update the ctime/mtime/change_attribute.
789 static int nfs_check_inode_attributes(struct inode
*inode
, struct nfs_fattr
*fattr
)
791 struct nfs_inode
*nfsi
= NFS_I(inode
);
792 loff_t cur_size
, new_isize
;
795 /* Has the inode gone and changed behind our back? */
796 if (nfsi
->fileid
!= fattr
->fileid
797 || (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
)) {
801 /* Do atomic weak cache consistency updates */
802 nfs_wcc_update_inode(inode
, fattr
);
804 if ((fattr
->valid
& NFS_ATTR_FATTR_V4
) != 0 &&
805 nfsi
->change_attr
!= fattr
->change_attr
)
806 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
808 /* Verify a few of the more important attributes */
809 if (!timespec_equal(&inode
->i_mtime
, &fattr
->mtime
))
810 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
812 cur_size
= i_size_read(inode
);
813 new_isize
= nfs_size_to_loff_t(fattr
->size
);
814 if (cur_size
!= new_isize
&& nfsi
->npages
== 0)
815 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
817 /* Have any file permissions changed? */
818 if ((inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
)
819 || inode
->i_uid
!= fattr
->uid
820 || inode
->i_gid
!= fattr
->gid
)
821 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
823 /* Has the link count changed? */
824 if (inode
->i_nlink
!= fattr
->nlink
)
825 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
827 if (!timespec_equal(&inode
->i_atime
, &fattr
->atime
))
828 nfsi
->cache_validity
|= NFS_INO_INVALID_ATIME
;
830 nfsi
->read_cache_jiffies
= fattr
->time_start
;
835 * nfs_refresh_inode - try to update the inode attribute cache
836 * @inode - pointer to inode
837 * @fattr - updated attributes
839 * Check that an RPC call that returned attributes has not overlapped with
840 * other recent updates of the inode metadata, then decide whether it is
841 * safe to do a full update of the inode attributes, or whether just to
842 * call nfs_check_inode_attributes.
844 int nfs_refresh_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
846 struct nfs_inode
*nfsi
= NFS_I(inode
);
849 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
851 spin_lock(&inode
->i_lock
);
852 if (time_after(fattr
->time_start
, nfsi
->last_updated
))
853 status
= nfs_update_inode(inode
, fattr
);
855 status
= nfs_check_inode_attributes(inode
, fattr
);
857 spin_unlock(&inode
->i_lock
);
862 * nfs_post_op_update_inode - try to update the inode attribute cache
863 * @inode - pointer to inode
864 * @fattr - updated attributes
866 * After an operation that has changed the inode metadata, mark the
867 * attribute cache as being invalid, then try to update it.
869 * NB: if the server didn't return any post op attributes, this
870 * function will force the retrieval of attributes before the next
871 * NFS request. Thus it should be used only for operations that
872 * are expected to change one or more attributes, to avoid
873 * unnecessary NFS requests and trips through nfs_update_inode().
875 int nfs_post_op_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
877 struct nfs_inode
*nfsi
= NFS_I(inode
);
879 if (fattr
->valid
& NFS_ATTR_FATTR
) {
880 if (S_ISDIR(inode
->i_mode
)) {
881 spin_lock(&inode
->i_lock
);
882 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
883 spin_unlock(&inode
->i_lock
);
885 return nfs_refresh_inode(inode
, fattr
);
888 spin_lock(&inode
->i_lock
);
889 nfsi
->cache_validity
|= NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
890 if (S_ISDIR(inode
->i_mode
))
891 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
892 spin_unlock(&inode
->i_lock
);
897 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
898 * @inode - pointer to inode
899 * @fattr - updated attributes
901 * After an operation that has changed the inode metadata, mark the
902 * attribute cache as being invalid, then try to update it. Fake up
903 * weak cache consistency data, if none exist.
905 * This function is mainly designed to be used by the ->write_done() functions.
907 int nfs_post_op_update_inode_force_wcc(struct inode
*inode
, struct nfs_fattr
*fattr
)
909 if ((fattr
->valid
& NFS_ATTR_FATTR_V4
) != 0 &&
910 (fattr
->valid
& NFS_ATTR_WCC_V4
) == 0) {
911 fattr
->pre_change_attr
= NFS_I(inode
)->change_attr
;
912 fattr
->valid
|= NFS_ATTR_WCC_V4
;
914 if ((fattr
->valid
& NFS_ATTR_FATTR
) != 0 &&
915 (fattr
->valid
& NFS_ATTR_WCC
) == 0) {
916 memcpy(&fattr
->pre_ctime
, &inode
->i_ctime
, sizeof(fattr
->pre_ctime
));
917 memcpy(&fattr
->pre_mtime
, &inode
->i_mtime
, sizeof(fattr
->pre_mtime
));
918 fattr
->pre_size
= inode
->i_size
;
919 fattr
->valid
|= NFS_ATTR_WCC
;
921 return nfs_post_op_update_inode(inode
, fattr
);
925 * Many nfs protocol calls return the new file attributes after
926 * an operation. Here we update the inode to reflect the state
927 * of the server's inode.
929 * This is a bit tricky because we have to make sure all dirty pages
930 * have been sent off to the server before calling invalidate_inode_pages.
931 * To make sure no other process adds more write requests while we try
932 * our best to flush them, we make them sleep during the attribute refresh.
934 * A very similar scenario holds for the dir cache.
936 static int nfs_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
938 struct nfs_server
*server
;
939 struct nfs_inode
*nfsi
= NFS_I(inode
);
940 loff_t cur_isize
, new_isize
;
941 unsigned int invalid
= 0;
942 unsigned long now
= jiffies
;
944 dfprintk(VFS
, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
945 __FUNCTION__
, inode
->i_sb
->s_id
, inode
->i_ino
,
946 atomic_read(&inode
->i_count
), fattr
->valid
);
948 if (nfsi
->fileid
!= fattr
->fileid
)
952 * Make sure the inode's type hasn't changed.
954 if ((inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
))
957 server
= NFS_SERVER(inode
);
958 /* Update the fsid? */
959 if (S_ISDIR(inode
->i_mode
)
960 && !nfs_fsid_equal(&server
->fsid
, &fattr
->fsid
))
961 server
->fsid
= fattr
->fsid
;
964 * Update the read time so we don't revalidate too often.
966 nfsi
->read_cache_jiffies
= fattr
->time_start
;
968 nfsi
->cache_validity
&= ~(NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ATIME
969 | NFS_INO_REVAL_PAGECACHE
);
971 /* Do atomic weak cache consistency updates */
972 nfs_wcc_update_inode(inode
, fattr
);
974 /* More cache consistency checks */
975 if (!(fattr
->valid
& NFS_ATTR_FATTR_V4
)) {
976 /* NFSv2/v3: Check if the mtime agrees */
977 if (!timespec_equal(&inode
->i_mtime
, &fattr
->mtime
)) {
978 dprintk("NFS: mtime change on server for file %s/%ld\n",
979 inode
->i_sb
->s_id
, inode
->i_ino
);
980 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
;
981 nfsi
->cache_change_attribute
= now
;
983 /* If ctime has changed we should definitely clear access+acl caches */
984 if (!timespec_equal(&inode
->i_ctime
, &fattr
->ctime
))
985 invalid
|= NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
986 } else if (nfsi
->change_attr
!= fattr
->change_attr
) {
987 dprintk("NFS: change_attr change on server for file %s/%ld\n",
988 inode
->i_sb
->s_id
, inode
->i_ino
);
989 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
990 nfsi
->cache_change_attribute
= now
;
993 /* Check if our cached file size is stale */
994 new_isize
= nfs_size_to_loff_t(fattr
->size
);
995 cur_isize
= i_size_read(inode
);
996 if (new_isize
!= cur_isize
) {
997 /* Do we perhaps have any outstanding writes, or has
998 * the file grown beyond our last write? */
999 if (nfsi
->npages
== 0 || new_isize
> cur_isize
) {
1000 inode
->i_size
= new_isize
;
1001 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
;
1003 dprintk("NFS: isize change on server for file %s/%ld\n",
1004 inode
->i_sb
->s_id
, inode
->i_ino
);
1008 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1009 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1010 memcpy(&inode
->i_atime
, &fattr
->atime
, sizeof(inode
->i_atime
));
1011 nfsi
->change_attr
= fattr
->change_attr
;
1013 if ((inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
) ||
1014 inode
->i_uid
!= fattr
->uid
||
1015 inode
->i_gid
!= fattr
->gid
)
1016 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1018 inode
->i_mode
= fattr
->mode
;
1019 inode
->i_nlink
= fattr
->nlink
;
1020 inode
->i_uid
= fattr
->uid
;
1021 inode
->i_gid
= fattr
->gid
;
1023 if (fattr
->valid
& (NFS_ATTR_FATTR_V3
| NFS_ATTR_FATTR_V4
)) {
1025 * report the blocks in 512byte units
1027 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
1029 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
1032 /* Update attrtimeo value if we're out of the unstable period */
1033 if (invalid
& NFS_INO_INVALID_ATTR
) {
1034 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
1035 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
1036 nfsi
->attrtimeo_timestamp
= now
;
1037 nfsi
->last_updated
= now
;
1039 if (!time_in_range(now
, nfsi
->attrtimeo_timestamp
, nfsi
->attrtimeo_timestamp
+ nfsi
->attrtimeo
)) {
1040 if ((nfsi
->attrtimeo
<<= 1) > NFS_MAXATTRTIMEO(inode
))
1041 nfsi
->attrtimeo
= NFS_MAXATTRTIMEO(inode
);
1042 nfsi
->attrtimeo_timestamp
= now
;
1045 * Avoid jiffy wraparound issues with nfsi->last_updated
1047 if (!time_in_range(nfsi
->last_updated
, nfsi
->read_cache_jiffies
, now
))
1048 nfsi
->last_updated
= nfsi
->read_cache_jiffies
;
1050 invalid
&= ~NFS_INO_INVALID_ATTR
;
1051 /* Don't invalidate the data if we were to blame */
1052 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
)
1053 || S_ISLNK(inode
->i_mode
)))
1054 invalid
&= ~NFS_INO_INVALID_DATA
;
1055 if (!nfs_have_delegation(inode
, FMODE_READ
) ||
1056 (nfsi
->cache_validity
& NFS_INO_REVAL_FORCED
))
1057 nfsi
->cache_validity
|= invalid
;
1058 nfsi
->cache_validity
&= ~NFS_INO_REVAL_FORCED
;
1063 * Big trouble! The inode has become a different object.
1065 printk(KERN_DEBUG
"%s: inode %ld mode changed, %07o to %07o\n",
1066 __FUNCTION__
, inode
->i_ino
, inode
->i_mode
, fattr
->mode
);
1069 * No need to worry about unhashing the dentry, as the
1070 * lookup validation will know that the inode is bad.
1071 * (But we fall through to invalidate the caches.)
1073 nfs_invalidate_inode(inode
);
1077 printk(KERN_ERR
"NFS: server %s error: fileid changed\n"
1078 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1079 NFS_SERVER(inode
)->nfs_client
->cl_hostname
, inode
->i_sb
->s_id
,
1080 (long long)nfsi
->fileid
, (long long)fattr
->fileid
);
1085 #ifdef CONFIG_NFS_V4
1088 * Clean out any remaining NFSv4 state that might be left over due
1089 * to open() calls that passed nfs_atomic_lookup, but failed to call
1092 void nfs4_clear_inode(struct inode
*inode
)
1094 /* If we are holding a delegation, return it! */
1095 nfs_inode_return_delegation(inode
);
1096 /* First call standard NFS clear_inode() code */
1097 nfs_clear_inode(inode
);
1101 struct inode
*nfs_alloc_inode(struct super_block
*sb
)
1103 struct nfs_inode
*nfsi
;
1104 nfsi
= (struct nfs_inode
*)kmem_cache_alloc(nfs_inode_cachep
, GFP_KERNEL
);
1108 nfsi
->cache_validity
= 0UL;
1109 #ifdef CONFIG_NFS_V3_ACL
1110 nfsi
->acl_access
= ERR_PTR(-EAGAIN
);
1111 nfsi
->acl_default
= ERR_PTR(-EAGAIN
);
1113 #ifdef CONFIG_NFS_V4
1114 nfsi
->nfs4_acl
= NULL
;
1115 #endif /* CONFIG_NFS_V4 */
1116 return &nfsi
->vfs_inode
;
1119 void nfs_destroy_inode(struct inode
*inode
)
1121 kmem_cache_free(nfs_inode_cachep
, NFS_I(inode
));
1124 static inline void nfs4_init_once(struct nfs_inode
*nfsi
)
1126 #ifdef CONFIG_NFS_V4
1127 INIT_LIST_HEAD(&nfsi
->open_states
);
1128 nfsi
->delegation
= NULL
;
1129 nfsi
->delegation_state
= 0;
1130 init_rwsem(&nfsi
->rwsem
);
1134 static void init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
1136 struct nfs_inode
*nfsi
= (struct nfs_inode
*) foo
;
1138 inode_init_once(&nfsi
->vfs_inode
);
1139 INIT_LIST_HEAD(&nfsi
->open_files
);
1140 INIT_LIST_HEAD(&nfsi
->access_cache_entry_lru
);
1141 INIT_LIST_HEAD(&nfsi
->access_cache_inode_lru
);
1142 INIT_RADIX_TREE(&nfsi
->nfs_page_tree
, GFP_ATOMIC
);
1145 nfs4_init_once(nfsi
);
1148 static int __init
nfs_init_inodecache(void)
1150 nfs_inode_cachep
= kmem_cache_create("nfs_inode_cache",
1151 sizeof(struct nfs_inode
),
1152 0, (SLAB_RECLAIM_ACCOUNT
|
1155 if (nfs_inode_cachep
== NULL
)
1161 static void nfs_destroy_inodecache(void)
1163 kmem_cache_destroy(nfs_inode_cachep
);
1169 static int __init
init_nfs_fs(void)
1173 err
= nfs_fs_proc_init();
1177 err
= nfs_init_nfspagecache();
1181 err
= nfs_init_inodecache();
1185 err
= nfs_init_readpagecache();
1189 err
= nfs_init_writepagecache();
1193 err
= nfs_init_directcache();
1197 #ifdef CONFIG_PROC_FS
1198 rpc_proc_register(&nfs_rpcstat
);
1200 if ((err
= register_nfs_fs()) != 0)
1204 #ifdef CONFIG_PROC_FS
1205 rpc_proc_unregister("nfs");
1207 nfs_destroy_directcache();
1209 nfs_destroy_writepagecache();
1211 nfs_destroy_readpagecache();
1213 nfs_destroy_inodecache();
1215 nfs_destroy_nfspagecache();
1222 static void __exit
exit_nfs_fs(void)
1224 nfs_destroy_directcache();
1225 nfs_destroy_writepagecache();
1226 nfs_destroy_readpagecache();
1227 nfs_destroy_inodecache();
1228 nfs_destroy_nfspagecache();
1229 #ifdef CONFIG_PROC_FS
1230 rpc_proc_unregister("nfs");
1232 unregister_nfs_fs();
1236 /* Not quite true; I just maintain it */
1237 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1238 MODULE_LICENSE("GPL");
1240 module_init(init_nfs_fs
)
1241 module_exit(exit_nfs_fs
)