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/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38 #include <linux/slab.h>
39 #include <linux/compat.h>
40 #include <linux/freezer.h>
42 #include <asm/uaccess.h>
46 #include "delegation.h"
56 #define NFSDBG_FACILITY NFSDBG_VFS
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64
= NFS_64_BIT_INODE_NUMBERS_ENABLED
;
63 static void nfs_invalidate_inode(struct inode
*);
64 static int nfs_update_inode(struct inode
*, struct nfs_fattr
*);
66 static struct kmem_cache
* nfs_inode_cachep
;
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr
*fattr
)
71 return nfs_fileid_to_ino_t(fattr
->fileid
);
75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
76 * @word: long word containing the bit lock
78 int nfs_wait_bit_killable(struct wait_bit_key
*key
)
80 if (fatal_signal_pending(current
))
82 freezable_schedule_unsafe();
85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable
);
88 * nfs_compat_user_ino64 - returns the user-visible inode number
89 * @fileid: 64-bit fileid
91 * This function returns a 32-bit inode number if the boot parameter
92 * nfs.enable_ino64 is zero.
94 u64
nfs_compat_user_ino64(u64 fileid
)
105 if (sizeof(ino
) < sizeof(fileid
))
106 ino
^= fileid
>> (sizeof(fileid
)-sizeof(ino
)) * 8;
110 int nfs_drop_inode(struct inode
*inode
)
112 return NFS_STALE(inode
) || generic_drop_inode(inode
);
114 EXPORT_SYMBOL_GPL(nfs_drop_inode
);
116 void nfs_clear_inode(struct inode
*inode
)
119 * The following should never happen...
121 WARN_ON_ONCE(nfs_have_writebacks(inode
));
122 WARN_ON_ONCE(!list_empty(&NFS_I(inode
)->open_files
));
123 nfs_zap_acl_cache(inode
);
124 nfs_access_zap_cache(inode
);
125 nfs_fscache_clear_inode(inode
);
127 EXPORT_SYMBOL_GPL(nfs_clear_inode
);
129 void nfs_evict_inode(struct inode
*inode
)
131 truncate_inode_pages_final(&inode
->i_data
);
133 nfs_clear_inode(inode
);
137 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
139 int nfs_sync_mapping(struct address_space
*mapping
)
143 if (mapping
->nrpages
!= 0) {
144 unmap_mapping_range(mapping
, 0, 0, 0);
145 ret
= nfs_wb_all(mapping
->host
);
150 static void nfs_set_cache_invalid(struct inode
*inode
, unsigned long flags
)
152 struct nfs_inode
*nfsi
= NFS_I(inode
);
154 if (inode
->i_mapping
->nrpages
== 0)
155 flags
&= ~NFS_INO_INVALID_DATA
;
156 nfsi
->cache_validity
|= flags
;
157 if (flags
& NFS_INO_INVALID_DATA
)
158 nfs_fscache_invalidate(inode
);
162 * Invalidate the local caches
164 static void nfs_zap_caches_locked(struct inode
*inode
)
166 struct nfs_inode
*nfsi
= NFS_I(inode
);
167 int mode
= inode
->i_mode
;
169 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
171 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
172 nfsi
->attrtimeo_timestamp
= jiffies
;
174 memset(NFS_I(inode
)->cookieverf
, 0, sizeof(NFS_I(inode
)->cookieverf
));
175 if (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
)) {
176 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
177 | NFS_INO_INVALID_DATA
178 | NFS_INO_INVALID_ACCESS
179 | NFS_INO_INVALID_ACL
180 | NFS_INO_REVAL_PAGECACHE
);
182 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
183 | NFS_INO_INVALID_ACCESS
184 | NFS_INO_INVALID_ACL
185 | NFS_INO_REVAL_PAGECACHE
);
186 nfs_zap_label_cache_locked(nfsi
);
189 void nfs_zap_caches(struct inode
*inode
)
191 spin_lock(&inode
->i_lock
);
192 nfs_zap_caches_locked(inode
);
193 spin_unlock(&inode
->i_lock
);
196 void nfs_zap_mapping(struct inode
*inode
, struct address_space
*mapping
)
198 if (mapping
->nrpages
!= 0) {
199 spin_lock(&inode
->i_lock
);
200 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_DATA
);
201 spin_unlock(&inode
->i_lock
);
205 void nfs_zap_acl_cache(struct inode
*inode
)
207 void (*clear_acl_cache
)(struct inode
*);
209 clear_acl_cache
= NFS_PROTO(inode
)->clear_acl_cache
;
210 if (clear_acl_cache
!= NULL
)
211 clear_acl_cache(inode
);
212 spin_lock(&inode
->i_lock
);
213 NFS_I(inode
)->cache_validity
&= ~NFS_INO_INVALID_ACL
;
214 spin_unlock(&inode
->i_lock
);
216 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache
);
218 void nfs_invalidate_atime(struct inode
*inode
)
220 spin_lock(&inode
->i_lock
);
221 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATIME
);
222 spin_unlock(&inode
->i_lock
);
224 EXPORT_SYMBOL_GPL(nfs_invalidate_atime
);
227 * Invalidate, but do not unhash, the inode.
228 * NB: must be called with inode->i_lock held!
230 static void nfs_invalidate_inode(struct inode
*inode
)
232 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
233 nfs_zap_caches_locked(inode
);
236 struct nfs_find_desc
{
238 struct nfs_fattr
*fattr
;
242 * In NFSv3 we can have 64bit inode numbers. In order to support
243 * this, and re-exported directories (also seen in NFSv2)
244 * we are forced to allow 2 different inodes to have the same
248 nfs_find_actor(struct inode
*inode
, void *opaque
)
250 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
251 struct nfs_fh
*fh
= desc
->fh
;
252 struct nfs_fattr
*fattr
= desc
->fattr
;
254 if (NFS_FILEID(inode
) != fattr
->fileid
)
256 if ((S_IFMT
& inode
->i_mode
) != (S_IFMT
& fattr
->mode
))
258 if (nfs_compare_fh(NFS_FH(inode
), fh
))
260 if (is_bad_inode(inode
) || NFS_STALE(inode
))
266 nfs_init_locked(struct inode
*inode
, void *opaque
)
268 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
269 struct nfs_fattr
*fattr
= desc
->fattr
;
271 set_nfs_fileid(inode
, fattr
->fileid
);
272 nfs_copy_fh(NFS_FH(inode
), desc
->fh
);
276 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
277 static void nfs_clear_label_invalid(struct inode
*inode
)
279 spin_lock(&inode
->i_lock
);
280 NFS_I(inode
)->cache_validity
&= ~NFS_INO_INVALID_LABEL
;
281 spin_unlock(&inode
->i_lock
);
284 void nfs_setsecurity(struct inode
*inode
, struct nfs_fattr
*fattr
,
285 struct nfs4_label
*label
)
292 if ((fattr
->valid
& NFS_ATTR_FATTR_V4_SECURITY_LABEL
) && inode
->i_security
) {
293 error
= security_inode_notifysecctx(inode
, label
->label
,
296 printk(KERN_ERR
"%s() %s %d "
297 "security_inode_notifysecctx() %d\n",
299 (char *)label
->label
,
301 nfs_clear_label_invalid(inode
);
305 struct nfs4_label
*nfs4_label_alloc(struct nfs_server
*server
, gfp_t flags
)
307 struct nfs4_label
*label
= NULL
;
308 int minor_version
= server
->nfs_client
->cl_minorversion
;
310 if (minor_version
< 2)
313 if (!(server
->caps
& NFS_CAP_SECURITY_LABEL
))
316 label
= kzalloc(sizeof(struct nfs4_label
), flags
);
318 return ERR_PTR(-ENOMEM
);
320 label
->label
= kzalloc(NFS4_MAXLABELLEN
, flags
);
321 if (label
->label
== NULL
) {
323 return ERR_PTR(-ENOMEM
);
325 label
->len
= NFS4_MAXLABELLEN
;
329 EXPORT_SYMBOL_GPL(nfs4_label_alloc
);
331 void nfs_setsecurity(struct inode
*inode
, struct nfs_fattr
*fattr
,
332 struct nfs4_label
*label
)
336 EXPORT_SYMBOL_GPL(nfs_setsecurity
);
339 * This is our front-end to iget that looks up inodes by file handle
340 * instead of inode number.
343 nfs_fhget(struct super_block
*sb
, struct nfs_fh
*fh
, struct nfs_fattr
*fattr
, struct nfs4_label
*label
)
345 struct nfs_find_desc desc
= {
349 struct inode
*inode
= ERR_PTR(-ENOENT
);
352 nfs_attr_check_mountpoint(sb
, fattr
);
354 if (((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) == 0) &&
355 !nfs_attr_use_mounted_on_fileid(fattr
))
357 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) == 0)
360 hash
= nfs_fattr_to_ino_t(fattr
);
362 inode
= iget5_locked(sb
, hash
, nfs_find_actor
, nfs_init_locked
, &desc
);
364 inode
= ERR_PTR(-ENOMEM
);
368 if (inode
->i_state
& I_NEW
) {
369 struct nfs_inode
*nfsi
= NFS_I(inode
);
370 unsigned long now
= jiffies
;
372 /* We set i_ino for the few things that still rely on it,
376 /* We can't support update_atime(), since the server will reset it */
377 inode
->i_flags
|= S_NOATIME
|S_NOCMTIME
;
378 inode
->i_mode
= fattr
->mode
;
379 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) == 0
380 && nfs_server_capable(inode
, NFS_CAP_MODE
))
381 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
382 /* Why so? Because we want revalidate for devices/FIFOs, and
383 * that's precisely what we have in nfs_file_inode_operations.
385 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_inode_ops
;
386 if (S_ISREG(inode
->i_mode
)) {
387 inode
->i_fop
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_ops
;
388 inode
->i_data
.a_ops
= &nfs_file_aops
;
389 inode
->i_data
.backing_dev_info
= &NFS_SB(sb
)->backing_dev_info
;
390 } else if (S_ISDIR(inode
->i_mode
)) {
391 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->dir_inode_ops
;
392 inode
->i_fop
= &nfs_dir_operations
;
393 inode
->i_data
.a_ops
= &nfs_dir_aops
;
394 /* Deal with crossing mountpoints */
395 if (fattr
->valid
& NFS_ATTR_FATTR_MOUNTPOINT
||
396 fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
) {
397 if (fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
)
398 inode
->i_op
= &nfs_referral_inode_operations
;
400 inode
->i_op
= &nfs_mountpoint_inode_operations
;
402 inode
->i_flags
|= S_AUTOMOUNT
;
404 } else if (S_ISLNK(inode
->i_mode
))
405 inode
->i_op
= &nfs_symlink_inode_operations
;
407 init_special_inode(inode
, inode
->i_mode
, fattr
->rdev
);
409 memset(&inode
->i_atime
, 0, sizeof(inode
->i_atime
));
410 memset(&inode
->i_mtime
, 0, sizeof(inode
->i_mtime
));
411 memset(&inode
->i_ctime
, 0, sizeof(inode
->i_ctime
));
412 inode
->i_version
= 0;
415 inode
->i_uid
= make_kuid(&init_user_ns
, -2);
416 inode
->i_gid
= make_kgid(&init_user_ns
, -2);
418 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
422 nfsi
->read_cache_jiffies
= fattr
->time_start
;
423 nfsi
->attr_gencount
= fattr
->gencount
;
424 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
425 inode
->i_atime
= fattr
->atime
;
426 else if (nfs_server_capable(inode
, NFS_CAP_ATIME
))
427 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
428 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
429 inode
->i_mtime
= fattr
->mtime
;
430 else if (nfs_server_capable(inode
, NFS_CAP_MTIME
))
431 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
432 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
433 inode
->i_ctime
= fattr
->ctime
;
434 else if (nfs_server_capable(inode
, NFS_CAP_CTIME
))
435 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
436 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
437 inode
->i_version
= fattr
->change_attr
;
438 else if (nfs_server_capable(inode
, NFS_CAP_CHANGE_ATTR
))
439 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
440 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
441 inode
->i_size
= nfs_size_to_loff_t(fattr
->size
);
443 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
444 | NFS_INO_REVAL_PAGECACHE
);
445 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
)
446 set_nlink(inode
, fattr
->nlink
);
447 else if (nfs_server_capable(inode
, NFS_CAP_NLINK
))
448 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
449 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
)
450 inode
->i_uid
= fattr
->uid
;
451 else if (nfs_server_capable(inode
, NFS_CAP_OWNER
))
452 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
453 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
)
454 inode
->i_gid
= fattr
->gid
;
455 else if (nfs_server_capable(inode
, NFS_CAP_OWNER_GROUP
))
456 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ATTR
);
457 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
458 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
459 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
461 * report the blocks in 512byte units
463 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
466 nfs_setsecurity(inode
, fattr
, label
);
468 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
469 nfsi
->attrtimeo_timestamp
= now
;
470 nfsi
->access_cache
= RB_ROOT
;
472 nfs_fscache_init_inode(inode
);
474 unlock_new_inode(inode
);
476 nfs_refresh_inode(inode
, fattr
);
477 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
479 (unsigned long long)NFS_FILEID(inode
),
480 nfs_display_fhandle_hash(fh
),
481 atomic_read(&inode
->i_count
));
487 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode
));
490 EXPORT_SYMBOL_GPL(nfs_fhget
);
492 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
495 nfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
497 struct inode
*inode
= dentry
->d_inode
;
498 struct nfs_fattr
*fattr
;
501 nfs_inc_stats(inode
, NFSIOS_VFSSETATTR
);
503 /* skip mode change if it's just for clearing setuid/setgid */
504 if (attr
->ia_valid
& (ATTR_KILL_SUID
| ATTR_KILL_SGID
))
505 attr
->ia_valid
&= ~ATTR_MODE
;
507 if (attr
->ia_valid
& ATTR_SIZE
) {
508 BUG_ON(!S_ISREG(inode
->i_mode
));
510 if (attr
->ia_size
== i_size_read(inode
))
511 attr
->ia_valid
&= ~ATTR_SIZE
;
514 /* Optimization: if the end result is no change, don't RPC */
515 attr
->ia_valid
&= NFS_VALID_ATTRS
;
516 if ((attr
->ia_valid
& ~(ATTR_FILE
|ATTR_OPEN
)) == 0)
519 trace_nfs_setattr_enter(inode
);
521 /* Write all dirty data */
522 if (S_ISREG(inode
->i_mode
)) {
523 nfs_inode_dio_wait(inode
);
527 fattr
= nfs_alloc_fattr();
531 * Return any delegations if we're going to change ACLs
533 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0)
534 NFS_PROTO(inode
)->return_delegation(inode
);
535 error
= NFS_PROTO(inode
)->setattr(dentry
, fattr
, attr
);
537 error
= nfs_refresh_inode(inode
, fattr
);
538 nfs_free_fattr(fattr
);
540 trace_nfs_setattr_exit(inode
, error
);
543 EXPORT_SYMBOL_GPL(nfs_setattr
);
546 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
547 * @inode: inode of the file used
548 * @offset: file offset to start truncating
550 * This is a copy of the common vmtruncate, but with the locking
551 * corrected to take into account the fact that NFS requires
552 * inode->i_size to be updated under the inode->i_lock.
554 static int nfs_vmtruncate(struct inode
* inode
, loff_t offset
)
558 err
= inode_newsize_ok(inode
, offset
);
562 spin_lock(&inode
->i_lock
);
563 i_size_write(inode
, offset
);
566 NFS_I(inode
)->cache_validity
&= ~NFS_INO_INVALID_DATA
;
567 spin_unlock(&inode
->i_lock
);
569 truncate_pagecache(inode
, offset
);
575 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
576 * @inode: pointer to struct inode
577 * @attr: pointer to struct iattr
579 * Note: we do this in the *proc.c in order to ensure that
580 * it works for things like exclusive creates too.
582 void nfs_setattr_update_inode(struct inode
*inode
, struct iattr
*attr
)
584 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0) {
585 spin_lock(&inode
->i_lock
);
586 if ((attr
->ia_valid
& ATTR_MODE
) != 0) {
587 int mode
= attr
->ia_mode
& S_IALLUGO
;
588 mode
|= inode
->i_mode
& ~S_IALLUGO
;
589 inode
->i_mode
= mode
;
591 if ((attr
->ia_valid
& ATTR_UID
) != 0)
592 inode
->i_uid
= attr
->ia_uid
;
593 if ((attr
->ia_valid
& ATTR_GID
) != 0)
594 inode
->i_gid
= attr
->ia_gid
;
595 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_ACCESS
596 | NFS_INO_INVALID_ACL
);
597 spin_unlock(&inode
->i_lock
);
599 if ((attr
->ia_valid
& ATTR_SIZE
) != 0) {
600 nfs_inc_stats(inode
, NFSIOS_SETATTRTRUNC
);
601 nfs_vmtruncate(inode
, attr
->ia_size
);
604 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode
);
606 static void nfs_request_parent_use_readdirplus(struct dentry
*dentry
)
608 struct dentry
*parent
;
610 parent
= dget_parent(dentry
);
611 nfs_force_use_readdirplus(parent
->d_inode
);
615 static bool nfs_need_revalidate_inode(struct inode
*inode
)
617 if (NFS_I(inode
)->cache_validity
&
618 (NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_LABEL
))
620 if (nfs_attribute_cache_expired(inode
))
625 int nfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
627 struct inode
*inode
= dentry
->d_inode
;
628 int need_atime
= NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_ATIME
;
631 trace_nfs_getattr_enter(inode
);
632 /* Flush out writes to the server in order to update c/mtime. */
633 if (S_ISREG(inode
->i_mode
)) {
634 nfs_inode_dio_wait(inode
);
635 err
= filemap_write_and_wait(inode
->i_mapping
);
641 * We may force a getattr if the user cares about atime.
643 * Note that we only have to check the vfsmount flags here:
644 * - NFS always sets S_NOATIME by so checking it would give a
646 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
647 * no point in checking those.
649 if ((mnt
->mnt_flags
& MNT_NOATIME
) ||
650 ((mnt
->mnt_flags
& MNT_NODIRATIME
) && S_ISDIR(inode
->i_mode
)))
653 if (need_atime
|| nfs_need_revalidate_inode(inode
)) {
654 struct nfs_server
*server
= NFS_SERVER(inode
);
656 if (server
->caps
& NFS_CAP_READDIRPLUS
)
657 nfs_request_parent_use_readdirplus(dentry
);
658 err
= __nfs_revalidate_inode(server
, inode
);
661 generic_fillattr(inode
, stat
);
662 stat
->ino
= nfs_compat_user_ino64(NFS_FILEID(inode
));
665 trace_nfs_getattr_exit(inode
, err
);
668 EXPORT_SYMBOL_GPL(nfs_getattr
);
670 static void nfs_init_lock_context(struct nfs_lock_context
*l_ctx
)
672 atomic_set(&l_ctx
->count
, 1);
673 l_ctx
->lockowner
.l_owner
= current
->files
;
674 l_ctx
->lockowner
.l_pid
= current
->tgid
;
675 INIT_LIST_HEAD(&l_ctx
->list
);
676 nfs_iocounter_init(&l_ctx
->io_count
);
679 static struct nfs_lock_context
*__nfs_find_lock_context(struct nfs_open_context
*ctx
)
681 struct nfs_lock_context
*head
= &ctx
->lock_context
;
682 struct nfs_lock_context
*pos
= head
;
685 if (pos
->lockowner
.l_owner
!= current
->files
)
687 if (pos
->lockowner
.l_pid
!= current
->tgid
)
689 atomic_inc(&pos
->count
);
691 } while ((pos
= list_entry(pos
->list
.next
, typeof(*pos
), list
)) != head
);
695 struct nfs_lock_context
*nfs_get_lock_context(struct nfs_open_context
*ctx
)
697 struct nfs_lock_context
*res
, *new = NULL
;
698 struct inode
*inode
= ctx
->dentry
->d_inode
;
700 spin_lock(&inode
->i_lock
);
701 res
= __nfs_find_lock_context(ctx
);
703 spin_unlock(&inode
->i_lock
);
704 new = kmalloc(sizeof(*new), GFP_KERNEL
);
706 return ERR_PTR(-ENOMEM
);
707 nfs_init_lock_context(new);
708 spin_lock(&inode
->i_lock
);
709 res
= __nfs_find_lock_context(ctx
);
711 list_add_tail(&new->list
, &ctx
->lock_context
.list
);
712 new->open_context
= ctx
;
717 spin_unlock(&inode
->i_lock
);
722 void nfs_put_lock_context(struct nfs_lock_context
*l_ctx
)
724 struct nfs_open_context
*ctx
= l_ctx
->open_context
;
725 struct inode
*inode
= ctx
->dentry
->d_inode
;
727 if (!atomic_dec_and_lock(&l_ctx
->count
, &inode
->i_lock
))
729 list_del(&l_ctx
->list
);
730 spin_unlock(&inode
->i_lock
);
735 * nfs_close_context - Common close_context() routine NFSv2/v3
736 * @ctx: pointer to context
737 * @is_sync: is this a synchronous close
739 * always ensure that the attributes are up to date if we're mounted
740 * with close-to-open semantics
742 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
)
745 struct nfs_server
*server
;
747 if (!(ctx
->mode
& FMODE_WRITE
))
751 inode
= ctx
->dentry
->d_inode
;
752 if (!list_empty(&NFS_I(inode
)->open_files
))
754 server
= NFS_SERVER(inode
);
755 if (server
->flags
& NFS_MOUNT_NOCTO
)
757 nfs_revalidate_inode(server
, inode
);
759 EXPORT_SYMBOL_GPL(nfs_close_context
);
761 struct nfs_open_context
*alloc_nfs_open_context(struct dentry
*dentry
, fmode_t f_mode
)
763 struct nfs_open_context
*ctx
;
764 struct rpc_cred
*cred
= rpc_lookup_cred();
766 return ERR_CAST(cred
);
768 ctx
= kmalloc(sizeof(*ctx
), GFP_KERNEL
);
771 return ERR_PTR(-ENOMEM
);
773 nfs_sb_active(dentry
->d_sb
);
774 ctx
->dentry
= dget(dentry
);
780 nfs_init_lock_context(&ctx
->lock_context
);
781 ctx
->lock_context
.open_context
= ctx
;
782 INIT_LIST_HEAD(&ctx
->list
);
783 ctx
->mdsthreshold
= NULL
;
786 EXPORT_SYMBOL_GPL(alloc_nfs_open_context
);
788 struct nfs_open_context
*get_nfs_open_context(struct nfs_open_context
*ctx
)
791 atomic_inc(&ctx
->lock_context
.count
);
794 EXPORT_SYMBOL_GPL(get_nfs_open_context
);
796 static void __put_nfs_open_context(struct nfs_open_context
*ctx
, int is_sync
)
798 struct inode
*inode
= ctx
->dentry
->d_inode
;
799 struct super_block
*sb
= ctx
->dentry
->d_sb
;
801 if (!list_empty(&ctx
->list
)) {
802 if (!atomic_dec_and_lock(&ctx
->lock_context
.count
, &inode
->i_lock
))
804 list_del(&ctx
->list
);
805 spin_unlock(&inode
->i_lock
);
806 } else if (!atomic_dec_and_test(&ctx
->lock_context
.count
))
809 NFS_PROTO(inode
)->close_context(ctx
, is_sync
);
810 if (ctx
->cred
!= NULL
)
811 put_rpccred(ctx
->cred
);
814 kfree(ctx
->mdsthreshold
);
818 void put_nfs_open_context(struct nfs_open_context
*ctx
)
820 __put_nfs_open_context(ctx
, 0);
822 EXPORT_SYMBOL_GPL(put_nfs_open_context
);
825 * Ensure that mmap has a recent RPC credential for use when writing out
828 void nfs_inode_attach_open_context(struct nfs_open_context
*ctx
)
830 struct inode
*inode
= ctx
->dentry
->d_inode
;
831 struct nfs_inode
*nfsi
= NFS_I(inode
);
833 spin_lock(&inode
->i_lock
);
834 list_add(&ctx
->list
, &nfsi
->open_files
);
835 spin_unlock(&inode
->i_lock
);
837 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context
);
839 void nfs_file_set_open_context(struct file
*filp
, struct nfs_open_context
*ctx
)
841 filp
->private_data
= get_nfs_open_context(ctx
);
842 if (list_empty(&ctx
->list
))
843 nfs_inode_attach_open_context(ctx
);
845 EXPORT_SYMBOL_GPL(nfs_file_set_open_context
);
848 * Given an inode, search for an open context with the desired characteristics
850 struct nfs_open_context
*nfs_find_open_context(struct inode
*inode
, struct rpc_cred
*cred
, fmode_t mode
)
852 struct nfs_inode
*nfsi
= NFS_I(inode
);
853 struct nfs_open_context
*pos
, *ctx
= NULL
;
855 spin_lock(&inode
->i_lock
);
856 list_for_each_entry(pos
, &nfsi
->open_files
, list
) {
857 if (cred
!= NULL
&& pos
->cred
!= cred
)
859 if ((pos
->mode
& (FMODE_READ
|FMODE_WRITE
)) != mode
)
861 ctx
= get_nfs_open_context(pos
);
864 spin_unlock(&inode
->i_lock
);
868 static void nfs_file_clear_open_context(struct file
*filp
)
870 struct nfs_open_context
*ctx
= nfs_file_open_context(filp
);
873 struct inode
*inode
= ctx
->dentry
->d_inode
;
875 filp
->private_data
= NULL
;
876 spin_lock(&inode
->i_lock
);
877 list_move_tail(&ctx
->list
, &NFS_I(inode
)->open_files
);
878 spin_unlock(&inode
->i_lock
);
879 __put_nfs_open_context(ctx
, filp
->f_flags
& O_DIRECT
? 0 : 1);
884 * These allocate and release file read/write context information.
886 int nfs_open(struct inode
*inode
, struct file
*filp
)
888 struct nfs_open_context
*ctx
;
890 ctx
= alloc_nfs_open_context(filp
->f_path
.dentry
, filp
->f_mode
);
893 nfs_file_set_open_context(filp
, ctx
);
894 put_nfs_open_context(ctx
);
895 nfs_fscache_open_file(inode
, filp
);
899 int nfs_release(struct inode
*inode
, struct file
*filp
)
901 nfs_file_clear_open_context(filp
);
906 * This function is called whenever some part of NFS notices that
907 * the cached attributes have to be refreshed.
910 __nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
912 int status
= -ESTALE
;
913 struct nfs4_label
*label
= NULL
;
914 struct nfs_fattr
*fattr
= NULL
;
915 struct nfs_inode
*nfsi
= NFS_I(inode
);
917 dfprintk(PAGECACHE
, "NFS: revalidating (%s/%Lu)\n",
918 inode
->i_sb
->s_id
, (unsigned long long)NFS_FILEID(inode
));
920 trace_nfs_revalidate_inode_enter(inode
);
922 if (is_bad_inode(inode
))
924 if (NFS_STALE(inode
))
928 fattr
= nfs_alloc_fattr();
932 nfs_inc_stats(inode
, NFSIOS_INODEREVALIDATE
);
934 label
= nfs4_label_alloc(NFS_SERVER(inode
), GFP_KERNEL
);
936 status
= PTR_ERR(label
);
940 status
= NFS_PROTO(inode
)->getattr(server
, NFS_FH(inode
), fattr
, label
);
942 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
944 (unsigned long long)NFS_FILEID(inode
), status
);
945 if (status
== -ESTALE
) {
946 nfs_zap_caches(inode
);
947 if (!S_ISDIR(inode
->i_mode
))
948 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
953 status
= nfs_refresh_inode(inode
, fattr
);
955 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
957 (unsigned long long)NFS_FILEID(inode
), status
);
961 if (nfsi
->cache_validity
& NFS_INO_INVALID_ACL
)
962 nfs_zap_acl_cache(inode
);
964 nfs_setsecurity(inode
, fattr
, label
);
966 dfprintk(PAGECACHE
, "NFS: (%s/%Lu) revalidation complete\n",
968 (unsigned long long)NFS_FILEID(inode
));
971 nfs4_label_free(label
);
973 nfs_free_fattr(fattr
);
974 trace_nfs_revalidate_inode_exit(inode
, status
);
978 int nfs_attribute_timeout(struct inode
*inode
)
980 struct nfs_inode
*nfsi
= NFS_I(inode
);
982 return !time_in_range_open(jiffies
, nfsi
->read_cache_jiffies
, nfsi
->read_cache_jiffies
+ nfsi
->attrtimeo
);
985 int nfs_attribute_cache_expired(struct inode
*inode
)
987 if (nfs_have_delegated_attributes(inode
))
989 return nfs_attribute_timeout(inode
);
993 * nfs_revalidate_inode - Revalidate the inode attributes
994 * @server - pointer to nfs_server struct
995 * @inode - pointer to inode struct
997 * Updates inode attribute information by retrieving the data from the server.
999 int nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
1001 if (!nfs_need_revalidate_inode(inode
))
1002 return NFS_STALE(inode
) ? -ESTALE
: 0;
1003 return __nfs_revalidate_inode(server
, inode
);
1005 EXPORT_SYMBOL_GPL(nfs_revalidate_inode
);
1007 int nfs_revalidate_inode_rcu(struct nfs_server
*server
, struct inode
*inode
)
1009 if (!(NFS_I(inode
)->cache_validity
&
1010 (NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_LABEL
))
1011 && !nfs_attribute_cache_expired(inode
))
1012 return NFS_STALE(inode
) ? -ESTALE
: 0;
1016 static int nfs_invalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
1018 struct nfs_inode
*nfsi
= NFS_I(inode
);
1021 if (mapping
->nrpages
!= 0) {
1022 if (S_ISREG(inode
->i_mode
)) {
1023 ret
= nfs_sync_mapping(mapping
);
1027 ret
= invalidate_inode_pages2(mapping
);
1031 if (S_ISDIR(inode
->i_mode
)) {
1032 spin_lock(&inode
->i_lock
);
1033 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
1034 spin_unlock(&inode
->i_lock
);
1036 nfs_inc_stats(inode
, NFSIOS_DATAINVALIDATE
);
1037 nfs_fscache_wait_on_invalidate(inode
);
1039 dfprintk(PAGECACHE
, "NFS: (%s/%Lu) data cache invalidated\n",
1041 (unsigned long long)NFS_FILEID(inode
));
1045 static bool nfs_mapping_need_revalidate_inode(struct inode
*inode
)
1047 if (nfs_have_delegated_attributes(inode
))
1049 return (NFS_I(inode
)->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
1050 || nfs_attribute_timeout(inode
)
1051 || NFS_STALE(inode
);
1055 * nfs_revalidate_mapping - Revalidate the pagecache
1056 * @inode - pointer to host inode
1057 * @mapping - pointer to mapping
1059 int nfs_revalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
1061 struct nfs_inode
*nfsi
= NFS_I(inode
);
1062 unsigned long *bitlock
= &nfsi
->flags
;
1065 /* swapfiles are not supposed to be shared. */
1066 if (IS_SWAPFILE(inode
))
1069 if (nfs_mapping_need_revalidate_inode(inode
)) {
1070 ret
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
1076 * We must clear NFS_INO_INVALID_DATA first to ensure that
1077 * invalidations that come in while we're shooting down the mappings
1078 * are respected. But, that leaves a race window where one revalidator
1079 * can clear the flag, and then another checks it before the mapping
1080 * gets invalidated. Fix that by serializing access to this part of
1083 * At the same time, we need to allow other tasks to see whether we
1084 * might be in the middle of invalidating the pages, so we only set
1085 * the bit lock here if it looks like we're going to be doing that.
1088 ret
= wait_on_bit_action(bitlock
, NFS_INO_INVALIDATING
,
1089 nfs_wait_bit_killable
, TASK_KILLABLE
);
1092 spin_lock(&inode
->i_lock
);
1093 if (test_bit(NFS_INO_INVALIDATING
, bitlock
)) {
1094 spin_unlock(&inode
->i_lock
);
1097 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
)
1099 spin_unlock(&inode
->i_lock
);
1103 set_bit(NFS_INO_INVALIDATING
, bitlock
);
1105 nfsi
->cache_validity
&= ~NFS_INO_INVALID_DATA
;
1106 spin_unlock(&inode
->i_lock
);
1107 trace_nfs_invalidate_mapping_enter(inode
);
1108 ret
= nfs_invalidate_mapping(inode
, mapping
);
1109 trace_nfs_invalidate_mapping_exit(inode
, ret
);
1111 clear_bit_unlock(NFS_INO_INVALIDATING
, bitlock
);
1112 smp_mb__after_atomic();
1113 wake_up_bit(bitlock
, NFS_INO_INVALIDATING
);
1118 static unsigned long nfs_wcc_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1120 struct nfs_inode
*nfsi
= NFS_I(inode
);
1121 unsigned long ret
= 0;
1123 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
)
1124 && (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
1125 && inode
->i_version
== fattr
->pre_change_attr
) {
1126 inode
->i_version
= fattr
->change_attr
;
1127 if (S_ISDIR(inode
->i_mode
))
1128 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_DATA
);
1129 ret
|= NFS_INO_INVALID_ATTR
;
1131 /* If we have atomic WCC data, we may update some attributes */
1132 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
)
1133 && (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
1134 && timespec_equal(&inode
->i_ctime
, &fattr
->pre_ctime
)) {
1135 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1136 ret
|= NFS_INO_INVALID_ATTR
;
1139 if ((fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
)
1140 && (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
1141 && timespec_equal(&inode
->i_mtime
, &fattr
->pre_mtime
)) {
1142 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1143 if (S_ISDIR(inode
->i_mode
))
1144 nfs_set_cache_invalid(inode
, NFS_INO_INVALID_DATA
);
1145 ret
|= NFS_INO_INVALID_ATTR
;
1147 if ((fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
)
1148 && (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
1149 && i_size_read(inode
) == nfs_size_to_loff_t(fattr
->pre_size
)
1150 && nfsi
->npages
== 0) {
1151 i_size_write(inode
, nfs_size_to_loff_t(fattr
->size
));
1152 ret
|= NFS_INO_INVALID_ATTR
;
1159 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1160 * @inode - pointer to inode
1161 * @fattr - updated attributes
1163 * Verifies the attribute cache. If we have just changed the attributes,
1164 * so that fattr carries weak cache consistency data, then it may
1165 * also update the ctime/mtime/change_attribute.
1167 static int nfs_check_inode_attributes(struct inode
*inode
, struct nfs_fattr
*fattr
)
1169 struct nfs_inode
*nfsi
= NFS_I(inode
);
1170 loff_t cur_size
, new_isize
;
1171 unsigned long invalid
= 0;
1174 if (nfs_have_delegated_attributes(inode
))
1176 /* Has the inode gone and changed behind our back? */
1177 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
)
1179 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
))
1182 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
1183 inode
->i_version
!= fattr
->change_attr
)
1184 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1186 /* Verify a few of the more important attributes */
1187 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) && !timespec_equal(&inode
->i_mtime
, &fattr
->mtime
))
1188 invalid
|= NFS_INO_INVALID_ATTR
;
1190 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
1191 cur_size
= i_size_read(inode
);
1192 new_isize
= nfs_size_to_loff_t(fattr
->size
);
1193 if (cur_size
!= new_isize
&& nfsi
->npages
== 0)
1194 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1197 /* Have any file permissions changed? */
1198 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) && (inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
))
1199 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1200 if ((fattr
->valid
& NFS_ATTR_FATTR_OWNER
) && !uid_eq(inode
->i_uid
, fattr
->uid
))
1201 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1202 if ((fattr
->valid
& NFS_ATTR_FATTR_GROUP
) && !gid_eq(inode
->i_gid
, fattr
->gid
))
1203 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1205 /* Has the link count changed? */
1206 if ((fattr
->valid
& NFS_ATTR_FATTR_NLINK
) && inode
->i_nlink
!= fattr
->nlink
)
1207 invalid
|= NFS_INO_INVALID_ATTR
;
1209 if ((fattr
->valid
& NFS_ATTR_FATTR_ATIME
) && !timespec_equal(&inode
->i_atime
, &fattr
->atime
))
1210 invalid
|= NFS_INO_INVALID_ATIME
;
1213 nfs_set_cache_invalid(inode
, invalid
);
1215 nfsi
->read_cache_jiffies
= fattr
->time_start
;
1219 static int nfs_ctime_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1221 if (!(fattr
->valid
& NFS_ATTR_FATTR_CTIME
))
1223 return timespec_compare(&fattr
->ctime
, &inode
->i_ctime
) > 0;
1226 static int nfs_size_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1228 if (!(fattr
->valid
& NFS_ATTR_FATTR_SIZE
))
1230 return nfs_size_to_loff_t(fattr
->size
) > i_size_read(inode
);
1233 static atomic_long_t nfs_attr_generation_counter
;
1235 static unsigned long nfs_read_attr_generation_counter(void)
1237 return atomic_long_read(&nfs_attr_generation_counter
);
1240 unsigned long nfs_inc_attr_generation_counter(void)
1242 return atomic_long_inc_return(&nfs_attr_generation_counter
);
1245 void nfs_fattr_init(struct nfs_fattr
*fattr
)
1248 fattr
->time_start
= jiffies
;
1249 fattr
->gencount
= nfs_inc_attr_generation_counter();
1250 fattr
->owner_name
= NULL
;
1251 fattr
->group_name
= NULL
;
1253 EXPORT_SYMBOL_GPL(nfs_fattr_init
);
1255 struct nfs_fattr
*nfs_alloc_fattr(void)
1257 struct nfs_fattr
*fattr
;
1259 fattr
= kmalloc(sizeof(*fattr
), GFP_NOFS
);
1261 nfs_fattr_init(fattr
);
1264 EXPORT_SYMBOL_GPL(nfs_alloc_fattr
);
1266 struct nfs_fh
*nfs_alloc_fhandle(void)
1270 fh
= kmalloc(sizeof(struct nfs_fh
), GFP_NOFS
);
1275 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle
);
1279 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1280 * in the same way that wireshark does
1284 * For debugging only.
1286 u32
_nfs_display_fhandle_hash(const struct nfs_fh
*fh
)
1288 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1289 * not on the result */
1290 return nfs_fhandle_hash(fh
);
1292 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash
);
1295 * _nfs_display_fhandle - display an NFS file handle on the console
1297 * @fh: file handle to display
1298 * @caption: display caption
1300 * For debugging only.
1302 void _nfs_display_fhandle(const struct nfs_fh
*fh
, const char *caption
)
1306 if (fh
== NULL
|| fh
->size
== 0) {
1307 printk(KERN_DEFAULT
"%s at %p is empty\n", caption
, fh
);
1311 printk(KERN_DEFAULT
"%s at %p is %u bytes, crc: 0x%08x:\n",
1312 caption
, fh
, fh
->size
, _nfs_display_fhandle_hash(fh
));
1313 for (i
= 0; i
< fh
->size
; i
+= 16) {
1314 __be32
*pos
= (__be32
*)&fh
->data
[i
];
1316 switch ((fh
->size
- i
- 1) >> 2) {
1318 printk(KERN_DEFAULT
" %08x\n",
1322 printk(KERN_DEFAULT
" %08x %08x\n",
1323 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1));
1326 printk(KERN_DEFAULT
" %08x %08x %08x\n",
1327 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1),
1328 be32_to_cpup(pos
+ 2));
1331 printk(KERN_DEFAULT
" %08x %08x %08x %08x\n",
1332 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1),
1333 be32_to_cpup(pos
+ 2), be32_to_cpup(pos
+ 3));
1337 EXPORT_SYMBOL_GPL(_nfs_display_fhandle
);
1341 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1342 * @inode - pointer to inode
1343 * @fattr - attributes
1345 * Attempt to divine whether or not an RPC call reply carrying stale
1346 * attributes got scheduled after another call carrying updated ones.
1348 * To do so, the function first assumes that a more recent ctime means
1349 * that the attributes in fattr are newer, however it also attempt to
1350 * catch the case where ctime either didn't change, or went backwards
1351 * (if someone reset the clock on the server) by looking at whether
1352 * or not this RPC call was started after the inode was last updated.
1353 * Note also the check for wraparound of 'attr_gencount'
1355 * The function returns 'true' if it thinks the attributes in 'fattr' are
1356 * more recent than the ones cached in the inode.
1359 static int nfs_inode_attrs_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1361 const struct nfs_inode
*nfsi
= NFS_I(inode
);
1363 return ((long)fattr
->gencount
- (long)nfsi
->attr_gencount
) > 0 ||
1364 nfs_ctime_need_update(inode
, fattr
) ||
1365 nfs_size_need_update(inode
, fattr
) ||
1366 ((long)nfsi
->attr_gencount
- (long)nfs_read_attr_generation_counter() > 0);
1370 * Don't trust the change_attribute, mtime, ctime or size if
1371 * a pnfs LAYOUTCOMMIT is outstanding
1373 static void nfs_inode_attrs_handle_layoutcommit(struct inode
*inode
,
1374 struct nfs_fattr
*fattr
)
1376 if (pnfs_layoutcommit_outstanding(inode
))
1377 fattr
->valid
&= ~(NFS_ATTR_FATTR_CHANGE
|
1378 NFS_ATTR_FATTR_MTIME
|
1379 NFS_ATTR_FATTR_CTIME
|
1380 NFS_ATTR_FATTR_SIZE
);
1383 static int nfs_refresh_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1387 trace_nfs_refresh_inode_enter(inode
);
1389 nfs_inode_attrs_handle_layoutcommit(inode
, fattr
);
1391 if (nfs_inode_attrs_need_update(inode
, fattr
))
1392 ret
= nfs_update_inode(inode
, fattr
);
1394 ret
= nfs_check_inode_attributes(inode
, fattr
);
1396 trace_nfs_refresh_inode_exit(inode
, ret
);
1401 * nfs_refresh_inode - try to update the inode attribute cache
1402 * @inode - pointer to inode
1403 * @fattr - updated attributes
1405 * Check that an RPC call that returned attributes has not overlapped with
1406 * other recent updates of the inode metadata, then decide whether it is
1407 * safe to do a full update of the inode attributes, or whether just to
1408 * call nfs_check_inode_attributes.
1410 int nfs_refresh_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1414 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1416 spin_lock(&inode
->i_lock
);
1417 status
= nfs_refresh_inode_locked(inode
, fattr
);
1418 spin_unlock(&inode
->i_lock
);
1422 EXPORT_SYMBOL_GPL(nfs_refresh_inode
);
1424 static int nfs_post_op_update_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1426 unsigned long invalid
= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1428 if (S_ISDIR(inode
->i_mode
))
1429 invalid
|= NFS_INO_INVALID_DATA
;
1430 nfs_set_cache_invalid(inode
, invalid
);
1431 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1433 return nfs_refresh_inode_locked(inode
, fattr
);
1437 * nfs_post_op_update_inode - try to update the inode attribute cache
1438 * @inode - pointer to inode
1439 * @fattr - updated attributes
1441 * After an operation that has changed the inode metadata, mark the
1442 * attribute cache as being invalid, then try to update it.
1444 * NB: if the server didn't return any post op attributes, this
1445 * function will force the retrieval of attributes before the next
1446 * NFS request. Thus it should be used only for operations that
1447 * are expected to change one or more attributes, to avoid
1448 * unnecessary NFS requests and trips through nfs_update_inode().
1450 int nfs_post_op_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1454 spin_lock(&inode
->i_lock
);
1455 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1456 spin_unlock(&inode
->i_lock
);
1460 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode
);
1463 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1464 * @inode - pointer to inode
1465 * @fattr - updated attributes
1467 * After an operation that has changed the inode metadata, mark the
1468 * attribute cache as being invalid, then try to update it. Fake up
1469 * weak cache consistency data, if none exist.
1471 * This function is mainly designed to be used by the ->write_done() functions.
1473 int nfs_post_op_update_inode_force_wcc(struct inode
*inode
, struct nfs_fattr
*fattr
)
1477 spin_lock(&inode
->i_lock
);
1478 /* Don't do a WCC update if these attributes are already stale */
1479 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0 ||
1480 !nfs_inode_attrs_need_update(inode
, fattr
)) {
1481 fattr
->valid
&= ~(NFS_ATTR_FATTR_PRECHANGE
1482 | NFS_ATTR_FATTR_PRESIZE
1483 | NFS_ATTR_FATTR_PREMTIME
1484 | NFS_ATTR_FATTR_PRECTIME
);
1487 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
1488 (fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
) == 0) {
1489 fattr
->pre_change_attr
= inode
->i_version
;
1490 fattr
->valid
|= NFS_ATTR_FATTR_PRECHANGE
;
1492 if ((fattr
->valid
& NFS_ATTR_FATTR_CTIME
) != 0 &&
1493 (fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
) == 0) {
1494 memcpy(&fattr
->pre_ctime
, &inode
->i_ctime
, sizeof(fattr
->pre_ctime
));
1495 fattr
->valid
|= NFS_ATTR_FATTR_PRECTIME
;
1497 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) != 0 &&
1498 (fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
) == 0) {
1499 memcpy(&fattr
->pre_mtime
, &inode
->i_mtime
, sizeof(fattr
->pre_mtime
));
1500 fattr
->valid
|= NFS_ATTR_FATTR_PREMTIME
;
1502 if ((fattr
->valid
& NFS_ATTR_FATTR_SIZE
) != 0 &&
1503 (fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
) == 0) {
1504 fattr
->pre_size
= i_size_read(inode
);
1505 fattr
->valid
|= NFS_ATTR_FATTR_PRESIZE
;
1508 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1509 spin_unlock(&inode
->i_lock
);
1512 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc
);
1515 * Many nfs protocol calls return the new file attributes after
1516 * an operation. Here we update the inode to reflect the state
1517 * of the server's inode.
1519 * This is a bit tricky because we have to make sure all dirty pages
1520 * have been sent off to the server before calling invalidate_inode_pages.
1521 * To make sure no other process adds more write requests while we try
1522 * our best to flush them, we make them sleep during the attribute refresh.
1524 * A very similar scenario holds for the dir cache.
1526 static int nfs_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1528 struct nfs_server
*server
;
1529 struct nfs_inode
*nfsi
= NFS_I(inode
);
1530 loff_t cur_isize
, new_isize
;
1531 unsigned long invalid
= 0;
1532 unsigned long now
= jiffies
;
1533 unsigned long save_cache_validity
;
1535 dfprintk(VFS
, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1536 __func__
, inode
->i_sb
->s_id
, inode
->i_ino
,
1537 nfs_display_fhandle_hash(NFS_FH(inode
)),
1538 atomic_read(&inode
->i_count
), fattr
->valid
);
1540 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
) {
1541 printk(KERN_ERR
"NFS: server %s error: fileid changed\n"
1542 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1543 NFS_SERVER(inode
)->nfs_client
->cl_hostname
,
1544 inode
->i_sb
->s_id
, (long long)nfsi
->fileid
,
1545 (long long)fattr
->fileid
);
1550 * Make sure the inode's type hasn't changed.
1552 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
)) {
1554 * Big trouble! The inode has become a different object.
1556 printk(KERN_DEBUG
"NFS: %s: inode %lu mode changed, %07o to %07o\n",
1557 __func__
, inode
->i_ino
, inode
->i_mode
, fattr
->mode
);
1561 server
= NFS_SERVER(inode
);
1562 /* Update the fsid? */
1563 if (S_ISDIR(inode
->i_mode
) && (fattr
->valid
& NFS_ATTR_FATTR_FSID
) &&
1564 !nfs_fsid_equal(&server
->fsid
, &fattr
->fsid
) &&
1565 !IS_AUTOMOUNT(inode
))
1566 server
->fsid
= fattr
->fsid
;
1569 * Update the read time so we don't revalidate too often.
1571 nfsi
->read_cache_jiffies
= fattr
->time_start
;
1573 save_cache_validity
= nfsi
->cache_validity
;
1574 nfsi
->cache_validity
&= ~(NFS_INO_INVALID_ATTR
1575 | NFS_INO_INVALID_ATIME
1576 | NFS_INO_REVAL_FORCED
1577 | NFS_INO_REVAL_PAGECACHE
);
1579 /* Do atomic weak cache consistency updates */
1580 invalid
|= nfs_wcc_update_inode(inode
, fattr
);
1582 /* More cache consistency checks */
1583 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) {
1584 if (inode
->i_version
!= fattr
->change_attr
) {
1585 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1586 inode
->i_sb
->s_id
, inode
->i_ino
);
1587 invalid
|= NFS_INO_INVALID_ATTR
1588 | NFS_INO_INVALID_DATA
1589 | NFS_INO_INVALID_ACCESS
1590 | NFS_INO_INVALID_ACL
1591 | NFS_INO_REVAL_PAGECACHE
;
1592 if (S_ISDIR(inode
->i_mode
))
1593 nfs_force_lookup_revalidate(inode
);
1594 inode
->i_version
= fattr
->change_attr
;
1596 } else if (server
->caps
& NFS_CAP_CHANGE_ATTR
)
1597 nfsi
->cache_validity
|= save_cache_validity
;
1599 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
) {
1600 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1601 } else if (server
->caps
& NFS_CAP_MTIME
)
1602 nfsi
->cache_validity
|= save_cache_validity
&
1603 (NFS_INO_INVALID_ATTR
1604 | NFS_INO_REVAL_FORCED
);
1606 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
) {
1607 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1608 } else if (server
->caps
& NFS_CAP_CTIME
)
1609 nfsi
->cache_validity
|= save_cache_validity
&
1610 (NFS_INO_INVALID_ATTR
1611 | NFS_INO_REVAL_FORCED
);
1613 /* Check if our cached file size is stale */
1614 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
1615 new_isize
= nfs_size_to_loff_t(fattr
->size
);
1616 cur_isize
= i_size_read(inode
);
1617 if (new_isize
!= cur_isize
) {
1618 /* Do we perhaps have any outstanding writes, or has
1619 * the file grown beyond our last write? */
1620 if ((nfsi
->npages
== 0) || new_isize
> cur_isize
) {
1621 i_size_write(inode
, new_isize
);
1622 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
;
1623 invalid
&= ~NFS_INO_REVAL_PAGECACHE
;
1625 dprintk("NFS: isize change on server for file %s/%ld "
1629 (long long)cur_isize
,
1630 (long long)new_isize
);
1633 nfsi
->cache_validity
|= save_cache_validity
&
1634 (NFS_INO_INVALID_ATTR
1635 | NFS_INO_REVAL_PAGECACHE
1636 | NFS_INO_REVAL_FORCED
);
1639 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
1640 memcpy(&inode
->i_atime
, &fattr
->atime
, sizeof(inode
->i_atime
));
1641 else if (server
->caps
& NFS_CAP_ATIME
)
1642 nfsi
->cache_validity
|= save_cache_validity
&
1643 (NFS_INO_INVALID_ATIME
1644 | NFS_INO_REVAL_FORCED
);
1646 if (fattr
->valid
& NFS_ATTR_FATTR_MODE
) {
1647 if ((inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
)) {
1648 umode_t newmode
= inode
->i_mode
& S_IFMT
;
1649 newmode
|= fattr
->mode
& S_IALLUGO
;
1650 inode
->i_mode
= newmode
;
1651 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1653 } else if (server
->caps
& NFS_CAP_MODE
)
1654 nfsi
->cache_validity
|= save_cache_validity
&
1655 (NFS_INO_INVALID_ATTR
1656 | NFS_INO_INVALID_ACCESS
1657 | NFS_INO_INVALID_ACL
1658 | NFS_INO_REVAL_FORCED
);
1660 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
) {
1661 if (!uid_eq(inode
->i_uid
, fattr
->uid
)) {
1662 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1663 inode
->i_uid
= fattr
->uid
;
1665 } else if (server
->caps
& NFS_CAP_OWNER
)
1666 nfsi
->cache_validity
|= save_cache_validity
&
1667 (NFS_INO_INVALID_ATTR
1668 | NFS_INO_INVALID_ACCESS
1669 | NFS_INO_INVALID_ACL
1670 | NFS_INO_REVAL_FORCED
);
1672 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
) {
1673 if (!gid_eq(inode
->i_gid
, fattr
->gid
)) {
1674 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1675 inode
->i_gid
= fattr
->gid
;
1677 } else if (server
->caps
& NFS_CAP_OWNER_GROUP
)
1678 nfsi
->cache_validity
|= save_cache_validity
&
1679 (NFS_INO_INVALID_ATTR
1680 | NFS_INO_INVALID_ACCESS
1681 | NFS_INO_INVALID_ACL
1682 | NFS_INO_REVAL_FORCED
);
1684 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
) {
1685 if (inode
->i_nlink
!= fattr
->nlink
) {
1686 invalid
|= NFS_INO_INVALID_ATTR
;
1687 if (S_ISDIR(inode
->i_mode
))
1688 invalid
|= NFS_INO_INVALID_DATA
;
1689 set_nlink(inode
, fattr
->nlink
);
1691 } else if (server
->caps
& NFS_CAP_NLINK
)
1692 nfsi
->cache_validity
|= save_cache_validity
&
1693 (NFS_INO_INVALID_ATTR
1694 | NFS_INO_REVAL_FORCED
);
1696 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
1698 * report the blocks in 512byte units
1700 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
1702 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
1703 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
1705 /* Update attrtimeo value if we're out of the unstable period */
1706 if (invalid
& NFS_INO_INVALID_ATTR
) {
1707 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
1708 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
1709 nfsi
->attrtimeo_timestamp
= now
;
1710 nfsi
->attr_gencount
= nfs_inc_attr_generation_counter();
1712 if (!time_in_range_open(now
, nfsi
->attrtimeo_timestamp
, nfsi
->attrtimeo_timestamp
+ nfsi
->attrtimeo
)) {
1713 if ((nfsi
->attrtimeo
<<= 1) > NFS_MAXATTRTIMEO(inode
))
1714 nfsi
->attrtimeo
= NFS_MAXATTRTIMEO(inode
);
1715 nfsi
->attrtimeo_timestamp
= now
;
1718 invalid
&= ~NFS_INO_INVALID_ATTR
;
1719 /* Don't invalidate the data if we were to blame */
1720 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
)
1721 || S_ISLNK(inode
->i_mode
)))
1722 invalid
&= ~NFS_INO_INVALID_DATA
;
1723 if (!NFS_PROTO(inode
)->have_delegation(inode
, FMODE_READ
) ||
1724 (save_cache_validity
& NFS_INO_REVAL_FORCED
))
1725 nfs_set_cache_invalid(inode
, invalid
);
1730 * No need to worry about unhashing the dentry, as the
1731 * lookup validation will know that the inode is bad.
1732 * (But we fall through to invalidate the caches.)
1734 nfs_invalidate_inode(inode
);
1738 struct inode
*nfs_alloc_inode(struct super_block
*sb
)
1740 struct nfs_inode
*nfsi
;
1741 nfsi
= (struct nfs_inode
*)kmem_cache_alloc(nfs_inode_cachep
, GFP_KERNEL
);
1745 nfsi
->cache_validity
= 0UL;
1746 #if IS_ENABLED(CONFIG_NFS_V4)
1747 nfsi
->nfs4_acl
= NULL
;
1748 #endif /* CONFIG_NFS_V4 */
1749 return &nfsi
->vfs_inode
;
1751 EXPORT_SYMBOL_GPL(nfs_alloc_inode
);
1753 static void nfs_i_callback(struct rcu_head
*head
)
1755 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
1756 kmem_cache_free(nfs_inode_cachep
, NFS_I(inode
));
1759 void nfs_destroy_inode(struct inode
*inode
)
1761 call_rcu(&inode
->i_rcu
, nfs_i_callback
);
1763 EXPORT_SYMBOL_GPL(nfs_destroy_inode
);
1765 static inline void nfs4_init_once(struct nfs_inode
*nfsi
)
1767 #if IS_ENABLED(CONFIG_NFS_V4)
1768 INIT_LIST_HEAD(&nfsi
->open_states
);
1769 nfsi
->delegation
= NULL
;
1770 nfsi
->delegation_state
= 0;
1771 init_rwsem(&nfsi
->rwsem
);
1772 nfsi
->layout
= NULL
;
1776 static void init_once(void *foo
)
1778 struct nfs_inode
*nfsi
= (struct nfs_inode
*) foo
;
1780 inode_init_once(&nfsi
->vfs_inode
);
1781 INIT_LIST_HEAD(&nfsi
->open_files
);
1782 INIT_LIST_HEAD(&nfsi
->access_cache_entry_lru
);
1783 INIT_LIST_HEAD(&nfsi
->access_cache_inode_lru
);
1784 INIT_LIST_HEAD(&nfsi
->commit_info
.list
);
1786 nfsi
->commit_info
.ncommit
= 0;
1787 atomic_set(&nfsi
->commit_info
.rpcs_out
, 0);
1788 atomic_set(&nfsi
->silly_count
, 1);
1789 INIT_HLIST_HEAD(&nfsi
->silly_list
);
1790 init_waitqueue_head(&nfsi
->waitqueue
);
1791 nfs4_init_once(nfsi
);
1794 static int __init
nfs_init_inodecache(void)
1796 nfs_inode_cachep
= kmem_cache_create("nfs_inode_cache",
1797 sizeof(struct nfs_inode
),
1798 0, (SLAB_RECLAIM_ACCOUNT
|
1801 if (nfs_inode_cachep
== NULL
)
1807 static void nfs_destroy_inodecache(void)
1810 * Make sure all delayed rcu free inodes are flushed before we
1814 kmem_cache_destroy(nfs_inode_cachep
);
1817 struct workqueue_struct
*nfsiod_workqueue
;
1818 EXPORT_SYMBOL_GPL(nfsiod_workqueue
);
1821 * start up the nfsiod workqueue
1823 static int nfsiod_start(void)
1825 struct workqueue_struct
*wq
;
1826 dprintk("RPC: creating workqueue nfsiod\n");
1827 wq
= alloc_workqueue("nfsiod", WQ_MEM_RECLAIM
, 0);
1830 nfsiod_workqueue
= wq
;
1835 * Destroy the nfsiod workqueue
1837 static void nfsiod_stop(void)
1839 struct workqueue_struct
*wq
;
1841 wq
= nfsiod_workqueue
;
1844 nfsiod_workqueue
= NULL
;
1845 destroy_workqueue(wq
);
1849 EXPORT_SYMBOL_GPL(nfs_net_id
);
1851 static int nfs_net_init(struct net
*net
)
1853 nfs_clients_init(net
);
1854 return nfs_fs_proc_net_init(net
);
1857 static void nfs_net_exit(struct net
*net
)
1859 nfs_fs_proc_net_exit(net
);
1860 nfs_cleanup_cb_ident_idr(net
);
1863 static struct pernet_operations nfs_net_ops
= {
1864 .init
= nfs_net_init
,
1865 .exit
= nfs_net_exit
,
1867 .size
= sizeof(struct nfs_net
),
1873 static int __init
init_nfs_fs(void)
1877 err
= register_pernet_subsys(&nfs_net_ops
);
1881 err
= nfs_fscache_register();
1885 err
= nfsiod_start();
1889 err
= nfs_fs_proc_init();
1893 err
= nfs_init_nfspagecache();
1897 err
= nfs_init_inodecache();
1901 err
= nfs_init_readpagecache();
1905 err
= nfs_init_writepagecache();
1909 err
= nfs_init_directcache();
1913 #ifdef CONFIG_PROC_FS
1914 rpc_proc_register(&init_net
, &nfs_rpcstat
);
1916 if ((err
= register_nfs_fs()) != 0)
1921 #ifdef CONFIG_PROC_FS
1922 rpc_proc_unregister(&init_net
, "nfs");
1924 nfs_destroy_directcache();
1926 nfs_destroy_writepagecache();
1928 nfs_destroy_readpagecache();
1930 nfs_destroy_inodecache();
1932 nfs_destroy_nfspagecache();
1938 nfs_fscache_unregister();
1940 unregister_pernet_subsys(&nfs_net_ops
);
1945 static void __exit
exit_nfs_fs(void)
1947 nfs_destroy_directcache();
1948 nfs_destroy_writepagecache();
1949 nfs_destroy_readpagecache();
1950 nfs_destroy_inodecache();
1951 nfs_destroy_nfspagecache();
1952 nfs_fscache_unregister();
1953 unregister_pernet_subsys(&nfs_net_ops
);
1954 #ifdef CONFIG_PROC_FS
1955 rpc_proc_unregister(&init_net
, "nfs");
1957 unregister_nfs_fs();
1962 /* Not quite true; I just maintain it */
1963 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1964 MODULE_LICENSE("GPL");
1965 module_param(enable_ino64
, bool, 0644);
1967 module_init(init_nfs_fs
)
1968 module_exit(exit_nfs_fs
)