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>
41 #include <linux/crc32.h>
43 #include <asm/uaccess.h>
47 #include "delegation.h"
55 #define NFSDBG_FACILITY NFSDBG_VFS
57 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59 /* Default is to see 64-bit inode numbers */
60 static bool enable_ino64
= NFS_64_BIT_INODE_NUMBERS_ENABLED
;
62 static void nfs_invalidate_inode(struct inode
*);
63 static int nfs_update_inode(struct inode
*, struct nfs_fattr
*);
65 static struct kmem_cache
* nfs_inode_cachep
;
67 static inline unsigned long
68 nfs_fattr_to_ino_t(struct nfs_fattr
*fattr
)
70 return nfs_fileid_to_ino_t(fattr
->fileid
);
74 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
75 * @word: long word containing the bit lock
77 int nfs_wait_bit_killable(void *word
)
79 if (fatal_signal_pending(current
))
81 freezable_schedule_unsafe();
84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable
);
87 * nfs_compat_user_ino64 - returns the user-visible inode number
88 * @fileid: 64-bit fileid
90 * This function returns a 32-bit inode number if the boot parameter
91 * nfs.enable_ino64 is zero.
93 u64
nfs_compat_user_ino64(u64 fileid
)
104 if (sizeof(ino
) < sizeof(fileid
))
105 ino
^= fileid
>> (sizeof(fileid
)-sizeof(ino
)) * 8;
109 int nfs_drop_inode(struct inode
*inode
)
111 return NFS_STALE(inode
) || generic_drop_inode(inode
);
113 EXPORT_SYMBOL_GPL(nfs_drop_inode
);
115 void nfs_clear_inode(struct inode
*inode
)
118 * The following should never happen...
120 WARN_ON_ONCE(nfs_have_writebacks(inode
));
121 WARN_ON_ONCE(!list_empty(&NFS_I(inode
)->open_files
));
122 nfs_zap_acl_cache(inode
);
123 nfs_access_zap_cache(inode
);
124 nfs_fscache_release_inode_cookie(inode
);
126 EXPORT_SYMBOL_GPL(nfs_clear_inode
);
128 void nfs_evict_inode(struct inode
*inode
)
130 truncate_inode_pages(&inode
->i_data
, 0);
132 nfs_clear_inode(inode
);
136 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
138 int nfs_sync_mapping(struct address_space
*mapping
)
142 if (mapping
->nrpages
!= 0) {
143 unmap_mapping_range(mapping
, 0, 0, 0);
144 ret
= nfs_wb_all(mapping
->host
);
150 * Invalidate the local caches
152 static void nfs_zap_caches_locked(struct inode
*inode
)
154 struct nfs_inode
*nfsi
= NFS_I(inode
);
155 int mode
= inode
->i_mode
;
157 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
159 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
160 nfsi
->attrtimeo_timestamp
= jiffies
;
162 memset(NFS_I(inode
)->cookieverf
, 0, sizeof(NFS_I(inode
)->cookieverf
));
163 if (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
)) {
164 nfs_fscache_invalidate(inode
);
165 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
166 | NFS_INO_INVALID_LABEL
167 | NFS_INO_INVALID_DATA
168 | NFS_INO_INVALID_ACCESS
169 | NFS_INO_INVALID_ACL
170 | NFS_INO_REVAL_PAGECACHE
;
172 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
173 | NFS_INO_INVALID_LABEL
174 | NFS_INO_INVALID_ACCESS
175 | NFS_INO_INVALID_ACL
176 | NFS_INO_REVAL_PAGECACHE
;
179 void nfs_zap_caches(struct inode
*inode
)
181 spin_lock(&inode
->i_lock
);
182 nfs_zap_caches_locked(inode
);
183 spin_unlock(&inode
->i_lock
);
186 void nfs_zap_mapping(struct inode
*inode
, struct address_space
*mapping
)
188 if (mapping
->nrpages
!= 0) {
189 spin_lock(&inode
->i_lock
);
190 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_DATA
;
191 nfs_fscache_invalidate(inode
);
192 spin_unlock(&inode
->i_lock
);
196 void nfs_zap_acl_cache(struct inode
*inode
)
198 void (*clear_acl_cache
)(struct inode
*);
200 clear_acl_cache
= NFS_PROTO(inode
)->clear_acl_cache
;
201 if (clear_acl_cache
!= NULL
)
202 clear_acl_cache(inode
);
203 spin_lock(&inode
->i_lock
);
204 NFS_I(inode
)->cache_validity
&= ~NFS_INO_INVALID_ACL
;
205 spin_unlock(&inode
->i_lock
);
207 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache
);
209 void nfs_invalidate_atime(struct inode
*inode
)
211 spin_lock(&inode
->i_lock
);
212 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ATIME
;
213 spin_unlock(&inode
->i_lock
);
215 EXPORT_SYMBOL_GPL(nfs_invalidate_atime
);
218 * Invalidate, but do not unhash, the inode.
219 * NB: must be called with inode->i_lock held!
221 static void nfs_invalidate_inode(struct inode
*inode
)
223 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
224 nfs_zap_caches_locked(inode
);
227 struct nfs_find_desc
{
229 struct nfs_fattr
*fattr
;
233 * In NFSv3 we can have 64bit inode numbers. In order to support
234 * this, and re-exported directories (also seen in NFSv2)
235 * we are forced to allow 2 different inodes to have the same
239 nfs_find_actor(struct inode
*inode
, void *opaque
)
241 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
242 struct nfs_fh
*fh
= desc
->fh
;
243 struct nfs_fattr
*fattr
= desc
->fattr
;
245 if (NFS_FILEID(inode
) != fattr
->fileid
)
247 if ((S_IFMT
& inode
->i_mode
) != (S_IFMT
& fattr
->mode
))
249 if (nfs_compare_fh(NFS_FH(inode
), fh
))
251 if (is_bad_inode(inode
) || NFS_STALE(inode
))
257 nfs_init_locked(struct inode
*inode
, void *opaque
)
259 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
260 struct nfs_fattr
*fattr
= desc
->fattr
;
262 set_nfs_fileid(inode
, fattr
->fileid
);
263 nfs_copy_fh(NFS_FH(inode
), desc
->fh
);
267 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
268 void nfs_setsecurity(struct inode
*inode
, struct nfs_fattr
*fattr
,
269 struct nfs4_label
*label
)
276 if (nfs_server_capable(inode
, NFS_CAP_SECURITY_LABEL
) == 0)
279 if (NFS_SERVER(inode
)->nfs_client
->cl_minorversion
< 2)
282 if ((fattr
->valid
& NFS_ATTR_FATTR_V4_SECURITY_LABEL
) && inode
->i_security
) {
283 error
= security_inode_notifysecctx(inode
, label
->label
,
286 printk(KERN_ERR
"%s() %s %d "
287 "security_inode_notifysecctx() %d\n",
289 (char *)label
->label
,
294 struct nfs4_label
*nfs4_label_alloc(struct nfs_server
*server
, gfp_t flags
)
296 struct nfs4_label
*label
= NULL
;
297 int minor_version
= server
->nfs_client
->cl_minorversion
;
299 if (minor_version
< 2)
302 if (!(server
->caps
& NFS_CAP_SECURITY_LABEL
))
305 label
= kzalloc(sizeof(struct nfs4_label
), flags
);
307 return ERR_PTR(-ENOMEM
);
309 label
->label
= kzalloc(NFS4_MAXLABELLEN
, flags
);
310 if (label
->label
== NULL
) {
312 return ERR_PTR(-ENOMEM
);
314 label
->len
= NFS4_MAXLABELLEN
;
318 EXPORT_SYMBOL_GPL(nfs4_label_alloc
);
320 void inline nfs_setsecurity(struct inode
*inode
, struct nfs_fattr
*fattr
,
321 struct nfs4_label
*label
)
325 EXPORT_SYMBOL_GPL(nfs_setsecurity
);
328 * This is our front-end to iget that looks up inodes by file handle
329 * instead of inode number.
332 nfs_fhget(struct super_block
*sb
, struct nfs_fh
*fh
, struct nfs_fattr
*fattr
, struct nfs4_label
*label
)
334 struct nfs_find_desc desc
= {
338 struct inode
*inode
= ERR_PTR(-ENOENT
);
341 nfs_attr_check_mountpoint(sb
, fattr
);
343 if (((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) == 0) &&
344 !nfs_attr_use_mounted_on_fileid(fattr
))
346 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) == 0)
349 hash
= nfs_fattr_to_ino_t(fattr
);
351 inode
= iget5_locked(sb
, hash
, nfs_find_actor
, nfs_init_locked
, &desc
);
353 inode
= ERR_PTR(-ENOMEM
);
357 if (inode
->i_state
& I_NEW
) {
358 struct nfs_inode
*nfsi
= NFS_I(inode
);
359 unsigned long now
= jiffies
;
361 /* We set i_ino for the few things that still rely on it,
365 /* We can't support update_atime(), since the server will reset it */
366 inode
->i_flags
|= S_NOATIME
|S_NOCMTIME
;
367 inode
->i_mode
= fattr
->mode
;
368 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) == 0
369 && nfs_server_capable(inode
, NFS_CAP_MODE
))
370 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
371 /* Why so? Because we want revalidate for devices/FIFOs, and
372 * that's precisely what we have in nfs_file_inode_operations.
374 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_inode_ops
;
375 if (S_ISREG(inode
->i_mode
)) {
376 inode
->i_fop
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_ops
;
377 inode
->i_data
.a_ops
= &nfs_file_aops
;
378 inode
->i_data
.backing_dev_info
= &NFS_SB(sb
)->backing_dev_info
;
379 } else if (S_ISDIR(inode
->i_mode
)) {
380 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->dir_inode_ops
;
381 inode
->i_fop
= &nfs_dir_operations
;
382 inode
->i_data
.a_ops
= &nfs_dir_aops
;
383 /* Deal with crossing mountpoints */
384 if (fattr
->valid
& NFS_ATTR_FATTR_MOUNTPOINT
||
385 fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
) {
386 if (fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
)
387 inode
->i_op
= &nfs_referral_inode_operations
;
389 inode
->i_op
= &nfs_mountpoint_inode_operations
;
391 inode
->i_flags
|= S_AUTOMOUNT
;
393 } else if (S_ISLNK(inode
->i_mode
))
394 inode
->i_op
= &nfs_symlink_inode_operations
;
396 init_special_inode(inode
, inode
->i_mode
, fattr
->rdev
);
398 memset(&inode
->i_atime
, 0, sizeof(inode
->i_atime
));
399 memset(&inode
->i_mtime
, 0, sizeof(inode
->i_mtime
));
400 memset(&inode
->i_ctime
, 0, sizeof(inode
->i_ctime
));
401 inode
->i_version
= 0;
404 inode
->i_uid
= make_kuid(&init_user_ns
, -2);
405 inode
->i_gid
= make_kgid(&init_user_ns
, -2);
407 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
411 nfsi
->read_cache_jiffies
= fattr
->time_start
;
412 nfsi
->attr_gencount
= fattr
->gencount
;
413 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
414 inode
->i_atime
= fattr
->atime
;
415 else if (nfs_server_capable(inode
, NFS_CAP_ATIME
))
416 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
417 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
418 inode
->i_mtime
= fattr
->mtime
;
419 else if (nfs_server_capable(inode
, NFS_CAP_MTIME
))
420 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
421 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
422 inode
->i_ctime
= fattr
->ctime
;
423 else if (nfs_server_capable(inode
, NFS_CAP_CTIME
))
424 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
425 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
426 inode
->i_version
= fattr
->change_attr
;
427 else if (nfs_server_capable(inode
, NFS_CAP_CHANGE_ATTR
))
428 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
429 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
430 inode
->i_size
= nfs_size_to_loff_t(fattr
->size
);
432 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
433 | NFS_INO_REVAL_PAGECACHE
;
434 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
)
435 set_nlink(inode
, fattr
->nlink
);
436 else if (nfs_server_capable(inode
, NFS_CAP_NLINK
))
437 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
438 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
)
439 inode
->i_uid
= fattr
->uid
;
440 else if (nfs_server_capable(inode
, NFS_CAP_OWNER
))
441 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
442 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
)
443 inode
->i_gid
= fattr
->gid
;
444 else if (nfs_server_capable(inode
, NFS_CAP_OWNER_GROUP
))
445 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
446 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
447 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
448 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
450 * report the blocks in 512byte units
452 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
455 nfs_setsecurity(inode
, fattr
, label
);
457 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
458 nfsi
->attrtimeo_timestamp
= now
;
459 nfsi
->access_cache
= RB_ROOT
;
461 nfs_fscache_init_inode_cookie(inode
);
463 unlock_new_inode(inode
);
465 nfs_refresh_inode(inode
, fattr
);
466 nfs_setsecurity(inode
, fattr
, label
);
467 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
469 (long long)NFS_FILEID(inode
),
470 nfs_display_fhandle_hash(fh
),
471 atomic_read(&inode
->i_count
));
477 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode
));
480 EXPORT_SYMBOL_GPL(nfs_fhget
);
482 #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)
485 nfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
487 struct inode
*inode
= dentry
->d_inode
;
488 struct nfs_fattr
*fattr
;
491 nfs_inc_stats(inode
, NFSIOS_VFSSETATTR
);
493 /* skip mode change if it's just for clearing setuid/setgid */
494 if (attr
->ia_valid
& (ATTR_KILL_SUID
| ATTR_KILL_SGID
))
495 attr
->ia_valid
&= ~ATTR_MODE
;
497 if (attr
->ia_valid
& ATTR_SIZE
) {
498 if (!S_ISREG(inode
->i_mode
) || attr
->ia_size
== i_size_read(inode
))
499 attr
->ia_valid
&= ~ATTR_SIZE
;
502 /* Optimization: if the end result is no change, don't RPC */
503 attr
->ia_valid
&= NFS_VALID_ATTRS
;
504 if ((attr
->ia_valid
& ~(ATTR_FILE
|ATTR_OPEN
)) == 0)
507 /* Write all dirty data */
508 if (S_ISREG(inode
->i_mode
)) {
509 nfs_inode_dio_wait(inode
);
513 fattr
= nfs_alloc_fattr();
517 * Return any delegations if we're going to change ACLs
519 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0)
520 NFS_PROTO(inode
)->return_delegation(inode
);
521 error
= NFS_PROTO(inode
)->setattr(dentry
, fattr
, attr
);
523 error
= nfs_refresh_inode(inode
, fattr
);
524 nfs_free_fattr(fattr
);
528 EXPORT_SYMBOL_GPL(nfs_setattr
);
531 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
532 * @inode: inode of the file used
533 * @offset: file offset to start truncating
535 * This is a copy of the common vmtruncate, but with the locking
536 * corrected to take into account the fact that NFS requires
537 * inode->i_size to be updated under the inode->i_lock.
539 static int nfs_vmtruncate(struct inode
* inode
, loff_t offset
)
544 err
= inode_newsize_ok(inode
, offset
);
548 spin_lock(&inode
->i_lock
);
549 oldsize
= inode
->i_size
;
550 i_size_write(inode
, offset
);
551 spin_unlock(&inode
->i_lock
);
553 truncate_pagecache(inode
, oldsize
, offset
);
559 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
560 * @inode: pointer to struct inode
561 * @attr: pointer to struct iattr
563 * Note: we do this in the *proc.c in order to ensure that
564 * it works for things like exclusive creates too.
566 void nfs_setattr_update_inode(struct inode
*inode
, struct iattr
*attr
)
568 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0) {
569 spin_lock(&inode
->i_lock
);
570 if ((attr
->ia_valid
& ATTR_MODE
) != 0) {
571 int mode
= attr
->ia_mode
& S_IALLUGO
;
572 mode
|= inode
->i_mode
& ~S_IALLUGO
;
573 inode
->i_mode
= mode
;
575 if ((attr
->ia_valid
& ATTR_UID
) != 0)
576 inode
->i_uid
= attr
->ia_uid
;
577 if ((attr
->ia_valid
& ATTR_GID
) != 0)
578 inode
->i_gid
= attr
->ia_gid
;
579 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
580 spin_unlock(&inode
->i_lock
);
582 if ((attr
->ia_valid
& ATTR_SIZE
) != 0) {
583 nfs_inc_stats(inode
, NFSIOS_SETATTRTRUNC
);
584 nfs_vmtruncate(inode
, attr
->ia_size
);
587 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode
);
589 int nfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
591 struct inode
*inode
= dentry
->d_inode
;
592 int need_atime
= NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_ATIME
;
595 /* Flush out writes to the server in order to update c/mtime. */
596 if (S_ISREG(inode
->i_mode
)) {
597 nfs_inode_dio_wait(inode
);
598 err
= filemap_write_and_wait(inode
->i_mapping
);
604 * We may force a getattr if the user cares about atime.
606 * Note that we only have to check the vfsmount flags here:
607 * - NFS always sets S_NOATIME by so checking it would give a
609 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
610 * no point in checking those.
612 if ((mnt
->mnt_flags
& MNT_NOATIME
) ||
613 ((mnt
->mnt_flags
& MNT_NODIRATIME
) && S_ISDIR(inode
->i_mode
)))
617 err
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
619 err
= nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
621 generic_fillattr(inode
, stat
);
622 stat
->ino
= nfs_compat_user_ino64(NFS_FILEID(inode
));
627 EXPORT_SYMBOL_GPL(nfs_getattr
);
629 static void nfs_init_lock_context(struct nfs_lock_context
*l_ctx
)
631 atomic_set(&l_ctx
->count
, 1);
632 l_ctx
->lockowner
.l_owner
= current
->files
;
633 l_ctx
->lockowner
.l_pid
= current
->tgid
;
634 INIT_LIST_HEAD(&l_ctx
->list
);
635 nfs_iocounter_init(&l_ctx
->io_count
);
638 static struct nfs_lock_context
*__nfs_find_lock_context(struct nfs_open_context
*ctx
)
640 struct nfs_lock_context
*head
= &ctx
->lock_context
;
641 struct nfs_lock_context
*pos
= head
;
644 if (pos
->lockowner
.l_owner
!= current
->files
)
646 if (pos
->lockowner
.l_pid
!= current
->tgid
)
648 atomic_inc(&pos
->count
);
650 } while ((pos
= list_entry(pos
->list
.next
, typeof(*pos
), list
)) != head
);
654 struct nfs_lock_context
*nfs_get_lock_context(struct nfs_open_context
*ctx
)
656 struct nfs_lock_context
*res
, *new = NULL
;
657 struct inode
*inode
= ctx
->dentry
->d_inode
;
659 spin_lock(&inode
->i_lock
);
660 res
= __nfs_find_lock_context(ctx
);
662 spin_unlock(&inode
->i_lock
);
663 new = kmalloc(sizeof(*new), GFP_KERNEL
);
665 return ERR_PTR(-ENOMEM
);
666 nfs_init_lock_context(new);
667 spin_lock(&inode
->i_lock
);
668 res
= __nfs_find_lock_context(ctx
);
670 list_add_tail(&new->list
, &ctx
->lock_context
.list
);
671 new->open_context
= ctx
;
676 spin_unlock(&inode
->i_lock
);
681 void nfs_put_lock_context(struct nfs_lock_context
*l_ctx
)
683 struct nfs_open_context
*ctx
= l_ctx
->open_context
;
684 struct inode
*inode
= ctx
->dentry
->d_inode
;
686 if (!atomic_dec_and_lock(&l_ctx
->count
, &inode
->i_lock
))
688 list_del(&l_ctx
->list
);
689 spin_unlock(&inode
->i_lock
);
694 * nfs_close_context - Common close_context() routine NFSv2/v3
695 * @ctx: pointer to context
696 * @is_sync: is this a synchronous close
698 * always ensure that the attributes are up to date if we're mounted
699 * with close-to-open semantics
701 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
)
704 struct nfs_server
*server
;
706 if (!(ctx
->mode
& FMODE_WRITE
))
710 inode
= ctx
->dentry
->d_inode
;
711 if (!list_empty(&NFS_I(inode
)->open_files
))
713 server
= NFS_SERVER(inode
);
714 if (server
->flags
& NFS_MOUNT_NOCTO
)
716 nfs_revalidate_inode(server
, inode
);
718 EXPORT_SYMBOL_GPL(nfs_close_context
);
720 struct nfs_open_context
*alloc_nfs_open_context(struct dentry
*dentry
, fmode_t f_mode
)
722 struct nfs_open_context
*ctx
;
723 struct rpc_cred
*cred
= rpc_lookup_cred();
725 return ERR_CAST(cred
);
727 ctx
= kmalloc(sizeof(*ctx
), GFP_KERNEL
);
730 return ERR_PTR(-ENOMEM
);
732 nfs_sb_active(dentry
->d_sb
);
733 ctx
->dentry
= dget(dentry
);
739 nfs_init_lock_context(&ctx
->lock_context
);
740 ctx
->lock_context
.open_context
= ctx
;
741 INIT_LIST_HEAD(&ctx
->list
);
742 ctx
->mdsthreshold
= NULL
;
745 EXPORT_SYMBOL_GPL(alloc_nfs_open_context
);
747 struct nfs_open_context
*get_nfs_open_context(struct nfs_open_context
*ctx
)
750 atomic_inc(&ctx
->lock_context
.count
);
753 EXPORT_SYMBOL_GPL(get_nfs_open_context
);
755 static void __put_nfs_open_context(struct nfs_open_context
*ctx
, int is_sync
)
757 struct inode
*inode
= ctx
->dentry
->d_inode
;
758 struct super_block
*sb
= ctx
->dentry
->d_sb
;
760 if (!list_empty(&ctx
->list
)) {
761 if (!atomic_dec_and_lock(&ctx
->lock_context
.count
, &inode
->i_lock
))
763 list_del(&ctx
->list
);
764 spin_unlock(&inode
->i_lock
);
765 } else if (!atomic_dec_and_test(&ctx
->lock_context
.count
))
768 NFS_PROTO(inode
)->close_context(ctx
, is_sync
);
769 if (ctx
->cred
!= NULL
)
770 put_rpccred(ctx
->cred
);
773 kfree(ctx
->mdsthreshold
);
777 void put_nfs_open_context(struct nfs_open_context
*ctx
)
779 __put_nfs_open_context(ctx
, 0);
781 EXPORT_SYMBOL_GPL(put_nfs_open_context
);
784 * Ensure that mmap has a recent RPC credential for use when writing out
787 void nfs_inode_attach_open_context(struct nfs_open_context
*ctx
)
789 struct inode
*inode
= ctx
->dentry
->d_inode
;
790 struct nfs_inode
*nfsi
= NFS_I(inode
);
792 spin_lock(&inode
->i_lock
);
793 list_add(&ctx
->list
, &nfsi
->open_files
);
794 spin_unlock(&inode
->i_lock
);
796 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context
);
798 void nfs_file_set_open_context(struct file
*filp
, struct nfs_open_context
*ctx
)
800 filp
->private_data
= get_nfs_open_context(ctx
);
801 if (list_empty(&ctx
->list
))
802 nfs_inode_attach_open_context(ctx
);
804 EXPORT_SYMBOL_GPL(nfs_file_set_open_context
);
807 * Given an inode, search for an open context with the desired characteristics
809 struct nfs_open_context
*nfs_find_open_context(struct inode
*inode
, struct rpc_cred
*cred
, fmode_t mode
)
811 struct nfs_inode
*nfsi
= NFS_I(inode
);
812 struct nfs_open_context
*pos
, *ctx
= NULL
;
814 spin_lock(&inode
->i_lock
);
815 list_for_each_entry(pos
, &nfsi
->open_files
, list
) {
816 if (cred
!= NULL
&& pos
->cred
!= cred
)
818 if ((pos
->mode
& (FMODE_READ
|FMODE_WRITE
)) != mode
)
820 ctx
= get_nfs_open_context(pos
);
823 spin_unlock(&inode
->i_lock
);
827 static void nfs_file_clear_open_context(struct file
*filp
)
829 struct nfs_open_context
*ctx
= nfs_file_open_context(filp
);
832 struct inode
*inode
= ctx
->dentry
->d_inode
;
834 filp
->private_data
= NULL
;
835 spin_lock(&inode
->i_lock
);
836 list_move_tail(&ctx
->list
, &NFS_I(inode
)->open_files
);
837 spin_unlock(&inode
->i_lock
);
838 __put_nfs_open_context(ctx
, filp
->f_flags
& O_DIRECT
? 0 : 1);
843 * These allocate and release file read/write context information.
845 int nfs_open(struct inode
*inode
, struct file
*filp
)
847 struct nfs_open_context
*ctx
;
849 ctx
= alloc_nfs_open_context(filp
->f_path
.dentry
, filp
->f_mode
);
852 nfs_file_set_open_context(filp
, ctx
);
853 put_nfs_open_context(ctx
);
854 nfs_fscache_set_inode_cookie(inode
, filp
);
858 int nfs_release(struct inode
*inode
, struct file
*filp
)
860 nfs_file_clear_open_context(filp
);
865 * This function is called whenever some part of NFS notices that
866 * the cached attributes have to be refreshed.
869 __nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
871 int status
= -ESTALE
;
872 struct nfs4_label
*label
= NULL
;
873 struct nfs_fattr
*fattr
= NULL
;
874 struct nfs_inode
*nfsi
= NFS_I(inode
);
876 dfprintk(PAGECACHE
, "NFS: revalidating (%s/%Ld)\n",
877 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
879 if (is_bad_inode(inode
))
881 if (NFS_STALE(inode
))
885 fattr
= nfs_alloc_fattr();
889 nfs_inc_stats(inode
, NFSIOS_INODEREVALIDATE
);
891 label
= nfs4_label_alloc(NFS_SERVER(inode
), GFP_KERNEL
);
893 status
= PTR_ERR(label
);
897 status
= NFS_PROTO(inode
)->getattr(server
, NFS_FH(inode
), fattr
, label
);
899 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
901 (long long)NFS_FILEID(inode
), status
);
902 if (status
== -ESTALE
) {
903 nfs_zap_caches(inode
);
904 if (!S_ISDIR(inode
->i_mode
))
905 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
910 status
= nfs_refresh_inode(inode
, fattr
);
912 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
914 (long long)NFS_FILEID(inode
), status
);
918 if (nfsi
->cache_validity
& NFS_INO_INVALID_ACL
)
919 nfs_zap_acl_cache(inode
);
921 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) revalidation complete\n",
923 (long long)NFS_FILEID(inode
));
926 nfs4_label_free(label
);
928 nfs_free_fattr(fattr
);
932 int nfs_attribute_timeout(struct inode
*inode
)
934 struct nfs_inode
*nfsi
= NFS_I(inode
);
936 return !time_in_range_open(jiffies
, nfsi
->read_cache_jiffies
, nfsi
->read_cache_jiffies
+ nfsi
->attrtimeo
);
939 int nfs_attribute_cache_expired(struct inode
*inode
)
941 if (nfs_have_delegated_attributes(inode
))
943 return nfs_attribute_timeout(inode
);
947 * nfs_revalidate_inode - Revalidate the inode attributes
948 * @server - pointer to nfs_server struct
949 * @inode - pointer to inode struct
951 * Updates inode attribute information by retrieving the data from the server.
953 int nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
955 if (!(NFS_I(inode
)->cache_validity
&
956 (NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_LABEL
))
957 && !nfs_attribute_cache_expired(inode
))
958 return NFS_STALE(inode
) ? -ESTALE
: 0;
959 return __nfs_revalidate_inode(server
, inode
);
961 EXPORT_SYMBOL_GPL(nfs_revalidate_inode
);
963 static int nfs_invalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
965 struct nfs_inode
*nfsi
= NFS_I(inode
);
967 if (mapping
->nrpages
!= 0) {
968 int ret
= invalidate_inode_pages2(mapping
);
972 spin_lock(&inode
->i_lock
);
973 nfsi
->cache_validity
&= ~NFS_INO_INVALID_DATA
;
974 if (S_ISDIR(inode
->i_mode
))
975 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
976 spin_unlock(&inode
->i_lock
);
977 nfs_inc_stats(inode
, NFSIOS_DATAINVALIDATE
);
978 nfs_fscache_wait_on_invalidate(inode
);
979 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) data cache invalidated\n",
980 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
984 static bool nfs_mapping_need_revalidate_inode(struct inode
*inode
)
986 if (nfs_have_delegated_attributes(inode
))
988 return (NFS_I(inode
)->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
989 || nfs_attribute_timeout(inode
)
994 * nfs_revalidate_mapping - Revalidate the pagecache
995 * @inode - pointer to host inode
996 * @mapping - pointer to mapping
998 int nfs_revalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
1000 struct nfs_inode
*nfsi
= NFS_I(inode
);
1003 /* swapfiles are not supposed to be shared. */
1004 if (IS_SWAPFILE(inode
))
1007 if (nfs_mapping_need_revalidate_inode(inode
)) {
1008 ret
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
1012 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
)
1013 ret
= nfs_invalidate_mapping(inode
, mapping
);
1018 static unsigned long nfs_wcc_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1020 struct nfs_inode
*nfsi
= NFS_I(inode
);
1021 unsigned long ret
= 0;
1023 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
)
1024 && (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
1025 && inode
->i_version
== fattr
->pre_change_attr
) {
1026 inode
->i_version
= fattr
->change_attr
;
1027 if (S_ISDIR(inode
->i_mode
))
1028 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
1029 ret
|= NFS_INO_INVALID_ATTR
;
1031 /* If we have atomic WCC data, we may update some attributes */
1032 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
)
1033 && (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
1034 && timespec_equal(&inode
->i_ctime
, &fattr
->pre_ctime
)) {
1035 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1036 ret
|= NFS_INO_INVALID_ATTR
;
1039 if ((fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
)
1040 && (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
1041 && timespec_equal(&inode
->i_mtime
, &fattr
->pre_mtime
)) {
1042 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1043 if (S_ISDIR(inode
->i_mode
))
1044 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
1045 ret
|= NFS_INO_INVALID_ATTR
;
1047 if ((fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
)
1048 && (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
1049 && i_size_read(inode
) == nfs_size_to_loff_t(fattr
->pre_size
)
1050 && nfsi
->npages
== 0) {
1051 i_size_write(inode
, nfs_size_to_loff_t(fattr
->size
));
1052 ret
|= NFS_INO_INVALID_ATTR
;
1055 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
)
1056 nfs_fscache_invalidate(inode
);
1062 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1063 * @inode - pointer to inode
1064 * @fattr - updated attributes
1066 * Verifies the attribute cache. If we have just changed the attributes,
1067 * so that fattr carries weak cache consistency data, then it may
1068 * also update the ctime/mtime/change_attribute.
1070 static int nfs_check_inode_attributes(struct inode
*inode
, struct nfs_fattr
*fattr
)
1072 struct nfs_inode
*nfsi
= NFS_I(inode
);
1073 loff_t cur_size
, new_isize
;
1074 unsigned long invalid
= 0;
1077 if (nfs_have_delegated_attributes(inode
))
1079 /* Has the inode gone and changed behind our back? */
1080 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
)
1082 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
))
1085 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
1086 inode
->i_version
!= fattr
->change_attr
)
1087 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1089 /* Verify a few of the more important attributes */
1090 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) && !timespec_equal(&inode
->i_mtime
, &fattr
->mtime
))
1091 invalid
|= NFS_INO_INVALID_ATTR
;
1093 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
1094 cur_size
= i_size_read(inode
);
1095 new_isize
= nfs_size_to_loff_t(fattr
->size
);
1096 if (cur_size
!= new_isize
&& nfsi
->npages
== 0)
1097 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1100 /* Have any file permissions changed? */
1101 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) && (inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
))
1102 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1103 if ((fattr
->valid
& NFS_ATTR_FATTR_OWNER
) && !uid_eq(inode
->i_uid
, fattr
->uid
))
1104 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1105 if ((fattr
->valid
& NFS_ATTR_FATTR_GROUP
) && !gid_eq(inode
->i_gid
, fattr
->gid
))
1106 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1108 /* Has the link count changed? */
1109 if ((fattr
->valid
& NFS_ATTR_FATTR_NLINK
) && inode
->i_nlink
!= fattr
->nlink
)
1110 invalid
|= NFS_INO_INVALID_ATTR
;
1112 if ((fattr
->valid
& NFS_ATTR_FATTR_ATIME
) && !timespec_equal(&inode
->i_atime
, &fattr
->atime
))
1113 invalid
|= NFS_INO_INVALID_ATIME
;
1116 nfsi
->cache_validity
|= invalid
;
1118 nfsi
->read_cache_jiffies
= fattr
->time_start
;
1122 static int nfs_ctime_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1124 if (!(fattr
->valid
& NFS_ATTR_FATTR_CTIME
))
1126 return timespec_compare(&fattr
->ctime
, &inode
->i_ctime
) > 0;
1129 static int nfs_size_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1131 if (!(fattr
->valid
& NFS_ATTR_FATTR_SIZE
))
1133 return nfs_size_to_loff_t(fattr
->size
) > i_size_read(inode
);
1136 static atomic_long_t nfs_attr_generation_counter
;
1138 static unsigned long nfs_read_attr_generation_counter(void)
1140 return atomic_long_read(&nfs_attr_generation_counter
);
1143 unsigned long nfs_inc_attr_generation_counter(void)
1145 return atomic_long_inc_return(&nfs_attr_generation_counter
);
1148 void nfs_fattr_init(struct nfs_fattr
*fattr
)
1151 fattr
->time_start
= jiffies
;
1152 fattr
->gencount
= nfs_inc_attr_generation_counter();
1153 fattr
->owner_name
= NULL
;
1154 fattr
->group_name
= NULL
;
1156 EXPORT_SYMBOL_GPL(nfs_fattr_init
);
1158 struct nfs_fattr
*nfs_alloc_fattr(void)
1160 struct nfs_fattr
*fattr
;
1162 fattr
= kmalloc(sizeof(*fattr
), GFP_NOFS
);
1164 nfs_fattr_init(fattr
);
1167 EXPORT_SYMBOL_GPL(nfs_alloc_fattr
);
1169 struct nfs_fh
*nfs_alloc_fhandle(void)
1173 fh
= kmalloc(sizeof(struct nfs_fh
), GFP_NOFS
);
1178 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle
);
1182 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1183 * in the same way that wireshark does
1187 * For debugging only.
1189 u32
_nfs_display_fhandle_hash(const struct nfs_fh
*fh
)
1191 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1192 * not on the result */
1193 return ~crc32(0xFFFFFFFF, &fh
->data
[0], fh
->size
);
1197 * _nfs_display_fhandle - display an NFS file handle on the console
1199 * @fh: file handle to display
1200 * @caption: display caption
1202 * For debugging only.
1204 void _nfs_display_fhandle(const struct nfs_fh
*fh
, const char *caption
)
1208 if (fh
== NULL
|| fh
->size
== 0) {
1209 printk(KERN_DEFAULT
"%s at %p is empty\n", caption
, fh
);
1213 printk(KERN_DEFAULT
"%s at %p is %u bytes, crc: 0x%08x:\n",
1214 caption
, fh
, fh
->size
, _nfs_display_fhandle_hash(fh
));
1215 for (i
= 0; i
< fh
->size
; i
+= 16) {
1216 __be32
*pos
= (__be32
*)&fh
->data
[i
];
1218 switch ((fh
->size
- i
- 1) >> 2) {
1220 printk(KERN_DEFAULT
" %08x\n",
1224 printk(KERN_DEFAULT
" %08x %08x\n",
1225 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1));
1228 printk(KERN_DEFAULT
" %08x %08x %08x\n",
1229 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1),
1230 be32_to_cpup(pos
+ 2));
1233 printk(KERN_DEFAULT
" %08x %08x %08x %08x\n",
1234 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1),
1235 be32_to_cpup(pos
+ 2), be32_to_cpup(pos
+ 3));
1242 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1243 * @inode - pointer to inode
1244 * @fattr - attributes
1246 * Attempt to divine whether or not an RPC call reply carrying stale
1247 * attributes got scheduled after another call carrying updated ones.
1249 * To do so, the function first assumes that a more recent ctime means
1250 * that the attributes in fattr are newer, however it also attempt to
1251 * catch the case where ctime either didn't change, or went backwards
1252 * (if someone reset the clock on the server) by looking at whether
1253 * or not this RPC call was started after the inode was last updated.
1254 * Note also the check for wraparound of 'attr_gencount'
1256 * The function returns 'true' if it thinks the attributes in 'fattr' are
1257 * more recent than the ones cached in the inode.
1260 static int nfs_inode_attrs_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1262 const struct nfs_inode
*nfsi
= NFS_I(inode
);
1264 return ((long)fattr
->gencount
- (long)nfsi
->attr_gencount
) > 0 ||
1265 nfs_ctime_need_update(inode
, fattr
) ||
1266 nfs_size_need_update(inode
, fattr
) ||
1267 ((long)nfsi
->attr_gencount
- (long)nfs_read_attr_generation_counter() > 0);
1270 static int nfs_refresh_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1272 if (nfs_inode_attrs_need_update(inode
, fattr
))
1273 return nfs_update_inode(inode
, fattr
);
1274 return nfs_check_inode_attributes(inode
, fattr
);
1278 * nfs_refresh_inode - try to update the inode attribute cache
1279 * @inode - pointer to inode
1280 * @fattr - updated attributes
1282 * Check that an RPC call that returned attributes has not overlapped with
1283 * other recent updates of the inode metadata, then decide whether it is
1284 * safe to do a full update of the inode attributes, or whether just to
1285 * call nfs_check_inode_attributes.
1287 int nfs_refresh_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1291 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1293 spin_lock(&inode
->i_lock
);
1294 status
= nfs_refresh_inode_locked(inode
, fattr
);
1295 spin_unlock(&inode
->i_lock
);
1299 EXPORT_SYMBOL_GPL(nfs_refresh_inode
);
1301 static int nfs_post_op_update_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1303 struct nfs_inode
*nfsi
= NFS_I(inode
);
1305 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1306 if (S_ISDIR(inode
->i_mode
)) {
1307 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
1308 nfs_fscache_invalidate(inode
);
1310 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1312 return nfs_refresh_inode_locked(inode
, fattr
);
1316 * nfs_post_op_update_inode - try to update the inode attribute cache
1317 * @inode - pointer to inode
1318 * @fattr - updated attributes
1320 * After an operation that has changed the inode metadata, mark the
1321 * attribute cache as being invalid, then try to update it.
1323 * NB: if the server didn't return any post op attributes, this
1324 * function will force the retrieval of attributes before the next
1325 * NFS request. Thus it should be used only for operations that
1326 * are expected to change one or more attributes, to avoid
1327 * unnecessary NFS requests and trips through nfs_update_inode().
1329 int nfs_post_op_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1333 spin_lock(&inode
->i_lock
);
1334 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1335 spin_unlock(&inode
->i_lock
);
1339 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode
);
1342 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1343 * @inode - pointer to inode
1344 * @fattr - updated attributes
1346 * After an operation that has changed the inode metadata, mark the
1347 * attribute cache as being invalid, then try to update it. Fake up
1348 * weak cache consistency data, if none exist.
1350 * This function is mainly designed to be used by the ->write_done() functions.
1352 int nfs_post_op_update_inode_force_wcc(struct inode
*inode
, struct nfs_fattr
*fattr
)
1356 spin_lock(&inode
->i_lock
);
1357 /* Don't do a WCC update if these attributes are already stale */
1358 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0 ||
1359 !nfs_inode_attrs_need_update(inode
, fattr
)) {
1360 fattr
->valid
&= ~(NFS_ATTR_FATTR_PRECHANGE
1361 | NFS_ATTR_FATTR_PRESIZE
1362 | NFS_ATTR_FATTR_PREMTIME
1363 | NFS_ATTR_FATTR_PRECTIME
);
1366 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
1367 (fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
) == 0) {
1368 fattr
->pre_change_attr
= inode
->i_version
;
1369 fattr
->valid
|= NFS_ATTR_FATTR_PRECHANGE
;
1371 if ((fattr
->valid
& NFS_ATTR_FATTR_CTIME
) != 0 &&
1372 (fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
) == 0) {
1373 memcpy(&fattr
->pre_ctime
, &inode
->i_ctime
, sizeof(fattr
->pre_ctime
));
1374 fattr
->valid
|= NFS_ATTR_FATTR_PRECTIME
;
1376 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) != 0 &&
1377 (fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
) == 0) {
1378 memcpy(&fattr
->pre_mtime
, &inode
->i_mtime
, sizeof(fattr
->pre_mtime
));
1379 fattr
->valid
|= NFS_ATTR_FATTR_PREMTIME
;
1381 if ((fattr
->valid
& NFS_ATTR_FATTR_SIZE
) != 0 &&
1382 (fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
) == 0) {
1383 fattr
->pre_size
= i_size_read(inode
);
1384 fattr
->valid
|= NFS_ATTR_FATTR_PRESIZE
;
1387 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1388 spin_unlock(&inode
->i_lock
);
1391 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc
);
1394 * Many nfs protocol calls return the new file attributes after
1395 * an operation. Here we update the inode to reflect the state
1396 * of the server's inode.
1398 * This is a bit tricky because we have to make sure all dirty pages
1399 * have been sent off to the server before calling invalidate_inode_pages.
1400 * To make sure no other process adds more write requests while we try
1401 * our best to flush them, we make them sleep during the attribute refresh.
1403 * A very similar scenario holds for the dir cache.
1405 static int nfs_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1407 struct nfs_server
*server
;
1408 struct nfs_inode
*nfsi
= NFS_I(inode
);
1409 loff_t cur_isize
, new_isize
;
1410 unsigned long invalid
= 0;
1411 unsigned long now
= jiffies
;
1412 unsigned long save_cache_validity
;
1414 dfprintk(VFS
, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1415 __func__
, inode
->i_sb
->s_id
, inode
->i_ino
,
1416 nfs_display_fhandle_hash(NFS_FH(inode
)),
1417 atomic_read(&inode
->i_count
), fattr
->valid
);
1419 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
) {
1420 printk(KERN_ERR
"NFS: server %s error: fileid changed\n"
1421 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1422 NFS_SERVER(inode
)->nfs_client
->cl_hostname
,
1423 inode
->i_sb
->s_id
, (long long)nfsi
->fileid
,
1424 (long long)fattr
->fileid
);
1429 * Make sure the inode's type hasn't changed.
1431 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
)) {
1433 * Big trouble! The inode has become a different object.
1435 printk(KERN_DEBUG
"NFS: %s: inode %ld mode changed, %07o to %07o\n",
1436 __func__
, inode
->i_ino
, inode
->i_mode
, fattr
->mode
);
1440 server
= NFS_SERVER(inode
);
1441 /* Update the fsid? */
1442 if (S_ISDIR(inode
->i_mode
) && (fattr
->valid
& NFS_ATTR_FATTR_FSID
) &&
1443 !nfs_fsid_equal(&server
->fsid
, &fattr
->fsid
) &&
1444 !IS_AUTOMOUNT(inode
))
1445 server
->fsid
= fattr
->fsid
;
1448 * Update the read time so we don't revalidate too often.
1450 nfsi
->read_cache_jiffies
= fattr
->time_start
;
1452 save_cache_validity
= nfsi
->cache_validity
;
1453 nfsi
->cache_validity
&= ~(NFS_INO_INVALID_ATTR
1454 | NFS_INO_INVALID_ATIME
1455 | NFS_INO_REVAL_FORCED
1456 | NFS_INO_REVAL_PAGECACHE
);
1458 /* Do atomic weak cache consistency updates */
1459 invalid
|= nfs_wcc_update_inode(inode
, fattr
);
1461 /* More cache consistency checks */
1462 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) {
1463 if (inode
->i_version
!= fattr
->change_attr
) {
1464 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1465 inode
->i_sb
->s_id
, inode
->i_ino
);
1466 invalid
|= NFS_INO_INVALID_ATTR
1467 | NFS_INO_INVALID_DATA
1468 | NFS_INO_INVALID_ACCESS
1469 | NFS_INO_INVALID_ACL
1470 | NFS_INO_REVAL_PAGECACHE
;
1471 if (S_ISDIR(inode
->i_mode
))
1472 nfs_force_lookup_revalidate(inode
);
1473 inode
->i_version
= fattr
->change_attr
;
1475 } else if (server
->caps
& NFS_CAP_CHANGE_ATTR
)
1476 invalid
|= save_cache_validity
;
1478 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
) {
1479 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1480 } else if (server
->caps
& NFS_CAP_MTIME
)
1481 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1482 | NFS_INO_REVAL_FORCED
);
1484 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
) {
1485 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1486 } else if (server
->caps
& NFS_CAP_CTIME
)
1487 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1488 | NFS_INO_REVAL_FORCED
);
1490 /* Check if our cached file size is stale */
1491 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
1492 new_isize
= nfs_size_to_loff_t(fattr
->size
);
1493 cur_isize
= i_size_read(inode
);
1494 if (new_isize
!= cur_isize
) {
1495 /* Do we perhaps have any outstanding writes, or has
1496 * the file grown beyond our last write? */
1497 if ((nfsi
->npages
== 0 && !test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) ||
1498 new_isize
> cur_isize
) {
1499 i_size_write(inode
, new_isize
);
1500 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
;
1502 dprintk("NFS: isize change on server for file %s/%ld "
1506 (long long)cur_isize
,
1507 (long long)new_isize
);
1510 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1511 | NFS_INO_REVAL_PAGECACHE
1512 | NFS_INO_REVAL_FORCED
);
1515 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
1516 memcpy(&inode
->i_atime
, &fattr
->atime
, sizeof(inode
->i_atime
));
1517 else if (server
->caps
& NFS_CAP_ATIME
)
1518 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATIME
1519 | NFS_INO_REVAL_FORCED
);
1521 if (fattr
->valid
& NFS_ATTR_FATTR_MODE
) {
1522 if ((inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
)) {
1523 umode_t newmode
= inode
->i_mode
& S_IFMT
;
1524 newmode
|= fattr
->mode
& S_IALLUGO
;
1525 inode
->i_mode
= newmode
;
1526 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1528 } else if (server
->caps
& NFS_CAP_MODE
)
1529 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1530 | NFS_INO_INVALID_ACCESS
1531 | NFS_INO_INVALID_ACL
1532 | NFS_INO_REVAL_FORCED
);
1534 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
) {
1535 if (!uid_eq(inode
->i_uid
, fattr
->uid
)) {
1536 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1537 inode
->i_uid
= fattr
->uid
;
1539 } else if (server
->caps
& NFS_CAP_OWNER
)
1540 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1541 | NFS_INO_INVALID_ACCESS
1542 | NFS_INO_INVALID_ACL
1543 | NFS_INO_REVAL_FORCED
);
1545 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
) {
1546 if (!gid_eq(inode
->i_gid
, fattr
->gid
)) {
1547 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1548 inode
->i_gid
= fattr
->gid
;
1550 } else if (server
->caps
& NFS_CAP_OWNER_GROUP
)
1551 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1552 | NFS_INO_INVALID_ACCESS
1553 | NFS_INO_INVALID_ACL
1554 | NFS_INO_REVAL_FORCED
);
1556 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
) {
1557 if (inode
->i_nlink
!= fattr
->nlink
) {
1558 invalid
|= NFS_INO_INVALID_ATTR
;
1559 if (S_ISDIR(inode
->i_mode
))
1560 invalid
|= NFS_INO_INVALID_DATA
;
1561 set_nlink(inode
, fattr
->nlink
);
1563 } else if (server
->caps
& NFS_CAP_NLINK
)
1564 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1565 | NFS_INO_REVAL_FORCED
);
1567 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
1569 * report the blocks in 512byte units
1571 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
1573 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
1574 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
1576 /* Update attrtimeo value if we're out of the unstable period */
1577 if (invalid
& (NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_LABEL
)) {
1578 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
1579 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
1580 nfsi
->attrtimeo_timestamp
= now
;
1581 nfsi
->attr_gencount
= nfs_inc_attr_generation_counter();
1583 if (!time_in_range_open(now
, nfsi
->attrtimeo_timestamp
, nfsi
->attrtimeo_timestamp
+ nfsi
->attrtimeo
)) {
1584 if ((nfsi
->attrtimeo
<<= 1) > NFS_MAXATTRTIMEO(inode
))
1585 nfsi
->attrtimeo
= NFS_MAXATTRTIMEO(inode
);
1586 nfsi
->attrtimeo_timestamp
= now
;
1589 invalid
&= ~NFS_INO_INVALID_ATTR
;
1590 invalid
&= ~NFS_INO_INVALID_LABEL
;
1591 /* Don't invalidate the data if we were to blame */
1592 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
)
1593 || S_ISLNK(inode
->i_mode
)))
1594 invalid
&= ~NFS_INO_INVALID_DATA
;
1595 if (!NFS_PROTO(inode
)->have_delegation(inode
, FMODE_READ
) ||
1596 (save_cache_validity
& NFS_INO_REVAL_FORCED
))
1597 nfsi
->cache_validity
|= invalid
;
1599 if (invalid
& NFS_INO_INVALID_DATA
)
1600 nfs_fscache_invalidate(inode
);
1605 * No need to worry about unhashing the dentry, as the
1606 * lookup validation will know that the inode is bad.
1607 * (But we fall through to invalidate the caches.)
1609 nfs_invalidate_inode(inode
);
1613 struct inode
*nfs_alloc_inode(struct super_block
*sb
)
1615 struct nfs_inode
*nfsi
;
1616 nfsi
= (struct nfs_inode
*)kmem_cache_alloc(nfs_inode_cachep
, GFP_KERNEL
);
1620 nfsi
->cache_validity
= 0UL;
1621 #ifdef CONFIG_NFS_V3_ACL
1622 nfsi
->acl_access
= ERR_PTR(-EAGAIN
);
1623 nfsi
->acl_default
= ERR_PTR(-EAGAIN
);
1625 #if IS_ENABLED(CONFIG_NFS_V4)
1626 nfsi
->nfs4_acl
= NULL
;
1627 #endif /* CONFIG_NFS_V4 */
1628 return &nfsi
->vfs_inode
;
1630 EXPORT_SYMBOL_GPL(nfs_alloc_inode
);
1632 static void nfs_i_callback(struct rcu_head
*head
)
1634 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
1635 kmem_cache_free(nfs_inode_cachep
, NFS_I(inode
));
1638 void nfs_destroy_inode(struct inode
*inode
)
1640 call_rcu(&inode
->i_rcu
, nfs_i_callback
);
1642 EXPORT_SYMBOL_GPL(nfs_destroy_inode
);
1644 static inline void nfs4_init_once(struct nfs_inode
*nfsi
)
1646 #if IS_ENABLED(CONFIG_NFS_V4)
1647 INIT_LIST_HEAD(&nfsi
->open_states
);
1648 nfsi
->delegation
= NULL
;
1649 nfsi
->delegation_state
= 0;
1650 init_rwsem(&nfsi
->rwsem
);
1651 nfsi
->layout
= NULL
;
1655 static void init_once(void *foo
)
1657 struct nfs_inode
*nfsi
= (struct nfs_inode
*) foo
;
1659 inode_init_once(&nfsi
->vfs_inode
);
1660 INIT_LIST_HEAD(&nfsi
->open_files
);
1661 INIT_LIST_HEAD(&nfsi
->access_cache_entry_lru
);
1662 INIT_LIST_HEAD(&nfsi
->access_cache_inode_lru
);
1663 INIT_LIST_HEAD(&nfsi
->commit_info
.list
);
1665 nfsi
->commit_info
.ncommit
= 0;
1666 atomic_set(&nfsi
->commit_info
.rpcs_out
, 0);
1667 atomic_set(&nfsi
->silly_count
, 1);
1668 INIT_HLIST_HEAD(&nfsi
->silly_list
);
1669 init_waitqueue_head(&nfsi
->waitqueue
);
1670 nfs4_init_once(nfsi
);
1673 static int __init
nfs_init_inodecache(void)
1675 nfs_inode_cachep
= kmem_cache_create("nfs_inode_cache",
1676 sizeof(struct nfs_inode
),
1677 0, (SLAB_RECLAIM_ACCOUNT
|
1680 if (nfs_inode_cachep
== NULL
)
1686 static void nfs_destroy_inodecache(void)
1689 * Make sure all delayed rcu free inodes are flushed before we
1693 kmem_cache_destroy(nfs_inode_cachep
);
1696 struct workqueue_struct
*nfsiod_workqueue
;
1697 EXPORT_SYMBOL_GPL(nfsiod_workqueue
);
1700 * start up the nfsiod workqueue
1702 static int nfsiod_start(void)
1704 struct workqueue_struct
*wq
;
1705 dprintk("RPC: creating workqueue nfsiod\n");
1706 wq
= alloc_workqueue("nfsiod", WQ_MEM_RECLAIM
, 0);
1709 nfsiod_workqueue
= wq
;
1714 * Destroy the nfsiod workqueue
1716 static void nfsiod_stop(void)
1718 struct workqueue_struct
*wq
;
1720 wq
= nfsiod_workqueue
;
1723 nfsiod_workqueue
= NULL
;
1724 destroy_workqueue(wq
);
1728 EXPORT_SYMBOL_GPL(nfs_net_id
);
1730 static int nfs_net_init(struct net
*net
)
1732 nfs_clients_init(net
);
1736 static void nfs_net_exit(struct net
*net
)
1738 nfs_cleanup_cb_ident_idr(net
);
1741 static struct pernet_operations nfs_net_ops
= {
1742 .init
= nfs_net_init
,
1743 .exit
= nfs_net_exit
,
1745 .size
= sizeof(struct nfs_net
),
1751 static int __init
init_nfs_fs(void)
1755 err
= register_pernet_subsys(&nfs_net_ops
);
1759 err
= nfs_fscache_register();
1763 err
= nfsiod_start();
1767 err
= nfs_fs_proc_init();
1771 err
= nfs_init_nfspagecache();
1775 err
= nfs_init_inodecache();
1779 err
= nfs_init_readpagecache();
1783 err
= nfs_init_writepagecache();
1787 err
= nfs_init_directcache();
1791 #ifdef CONFIG_PROC_FS
1792 rpc_proc_register(&init_net
, &nfs_rpcstat
);
1794 if ((err
= register_nfs_fs()) != 0)
1799 #ifdef CONFIG_PROC_FS
1800 rpc_proc_unregister(&init_net
, "nfs");
1802 nfs_destroy_directcache();
1804 nfs_destroy_writepagecache();
1806 nfs_destroy_readpagecache();
1808 nfs_destroy_inodecache();
1810 nfs_destroy_nfspagecache();
1816 nfs_fscache_unregister();
1818 unregister_pernet_subsys(&nfs_net_ops
);
1823 static void __exit
exit_nfs_fs(void)
1825 nfs_destroy_directcache();
1826 nfs_destroy_writepagecache();
1827 nfs_destroy_readpagecache();
1828 nfs_destroy_inodecache();
1829 nfs_destroy_nfspagecache();
1830 nfs_fscache_unregister();
1831 unregister_pernet_subsys(&nfs_net_ops
);
1832 #ifdef CONFIG_PROC_FS
1833 rpc_proc_unregister(&init_net
, "nfs");
1835 unregister_nfs_fs();
1840 /* Not quite true; I just maintain it */
1841 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1842 MODULE_LICENSE("GPL");
1843 module_param(enable_ino64
, bool, 0644);
1845 module_init(init_nfs_fs
)
1846 module_exit(exit_nfs_fs
)