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(void *word
)
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(&inode
->i_data
, 0);
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
);
151 * Invalidate the local caches
153 static void nfs_zap_caches_locked(struct inode
*inode
)
155 struct nfs_inode
*nfsi
= NFS_I(inode
);
156 int mode
= inode
->i_mode
;
158 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
160 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
161 nfsi
->attrtimeo_timestamp
= jiffies
;
163 memset(NFS_I(inode
)->cookieverf
, 0, sizeof(NFS_I(inode
)->cookieverf
));
164 if (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
)) {
165 nfs_fscache_invalidate(inode
);
166 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
167 | NFS_INO_INVALID_LABEL
168 | NFS_INO_INVALID_DATA
169 | NFS_INO_INVALID_ACCESS
170 | NFS_INO_INVALID_ACL
171 | NFS_INO_REVAL_PAGECACHE
;
173 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
174 | NFS_INO_INVALID_LABEL
175 | NFS_INO_INVALID_ACCESS
176 | NFS_INO_INVALID_ACL
177 | NFS_INO_REVAL_PAGECACHE
;
180 void nfs_zap_caches(struct inode
*inode
)
182 spin_lock(&inode
->i_lock
);
183 nfs_zap_caches_locked(inode
);
184 spin_unlock(&inode
->i_lock
);
187 void nfs_zap_mapping(struct inode
*inode
, struct address_space
*mapping
)
189 if (mapping
->nrpages
!= 0) {
190 spin_lock(&inode
->i_lock
);
191 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_DATA
;
192 nfs_fscache_invalidate(inode
);
193 spin_unlock(&inode
->i_lock
);
197 void nfs_zap_acl_cache(struct inode
*inode
)
199 void (*clear_acl_cache
)(struct inode
*);
201 clear_acl_cache
= NFS_PROTO(inode
)->clear_acl_cache
;
202 if (clear_acl_cache
!= NULL
)
203 clear_acl_cache(inode
);
204 spin_lock(&inode
->i_lock
);
205 NFS_I(inode
)->cache_validity
&= ~NFS_INO_INVALID_ACL
;
206 spin_unlock(&inode
->i_lock
);
208 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache
);
210 void nfs_invalidate_atime(struct inode
*inode
)
212 spin_lock(&inode
->i_lock
);
213 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ATIME
;
214 spin_unlock(&inode
->i_lock
);
216 EXPORT_SYMBOL_GPL(nfs_invalidate_atime
);
219 * Invalidate, but do not unhash, the inode.
220 * NB: must be called with inode->i_lock held!
222 static void nfs_invalidate_inode(struct inode
*inode
)
224 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
225 nfs_zap_caches_locked(inode
);
228 struct nfs_find_desc
{
230 struct nfs_fattr
*fattr
;
234 * In NFSv3 we can have 64bit inode numbers. In order to support
235 * this, and re-exported directories (also seen in NFSv2)
236 * we are forced to allow 2 different inodes to have the same
240 nfs_find_actor(struct inode
*inode
, void *opaque
)
242 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
243 struct nfs_fh
*fh
= desc
->fh
;
244 struct nfs_fattr
*fattr
= desc
->fattr
;
246 if (NFS_FILEID(inode
) != fattr
->fileid
)
248 if ((S_IFMT
& inode
->i_mode
) != (S_IFMT
& fattr
->mode
))
250 if (nfs_compare_fh(NFS_FH(inode
), fh
))
252 if (is_bad_inode(inode
) || NFS_STALE(inode
))
258 nfs_init_locked(struct inode
*inode
, void *opaque
)
260 struct nfs_find_desc
*desc
= (struct nfs_find_desc
*)opaque
;
261 struct nfs_fattr
*fattr
= desc
->fattr
;
263 set_nfs_fileid(inode
, fattr
->fileid
);
264 nfs_copy_fh(NFS_FH(inode
), desc
->fh
);
268 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
269 void nfs_setsecurity(struct inode
*inode
, struct nfs_fattr
*fattr
,
270 struct nfs4_label
*label
)
277 if ((fattr
->valid
& NFS_ATTR_FATTR_V4_SECURITY_LABEL
) && inode
->i_security
) {
278 error
= security_inode_notifysecctx(inode
, label
->label
,
281 printk(KERN_ERR
"%s() %s %d "
282 "security_inode_notifysecctx() %d\n",
284 (char *)label
->label
,
289 struct nfs4_label
*nfs4_label_alloc(struct nfs_server
*server
, gfp_t flags
)
291 struct nfs4_label
*label
= NULL
;
292 int minor_version
= server
->nfs_client
->cl_minorversion
;
294 if (minor_version
< 2)
297 if (!(server
->caps
& NFS_CAP_SECURITY_LABEL
))
300 label
= kzalloc(sizeof(struct nfs4_label
), flags
);
302 return ERR_PTR(-ENOMEM
);
304 label
->label
= kzalloc(NFS4_MAXLABELLEN
, flags
);
305 if (label
->label
== NULL
) {
307 return ERR_PTR(-ENOMEM
);
309 label
->len
= NFS4_MAXLABELLEN
;
313 EXPORT_SYMBOL_GPL(nfs4_label_alloc
);
315 void nfs_setsecurity(struct inode
*inode
, struct nfs_fattr
*fattr
,
316 struct nfs4_label
*label
)
320 EXPORT_SYMBOL_GPL(nfs_setsecurity
);
323 * This is our front-end to iget that looks up inodes by file handle
324 * instead of inode number.
327 nfs_fhget(struct super_block
*sb
, struct nfs_fh
*fh
, struct nfs_fattr
*fattr
, struct nfs4_label
*label
)
329 struct nfs_find_desc desc
= {
333 struct inode
*inode
= ERR_PTR(-ENOENT
);
336 nfs_attr_check_mountpoint(sb
, fattr
);
338 if (((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) == 0) &&
339 !nfs_attr_use_mounted_on_fileid(fattr
))
341 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) == 0)
344 hash
= nfs_fattr_to_ino_t(fattr
);
346 inode
= iget5_locked(sb
, hash
, nfs_find_actor
, nfs_init_locked
, &desc
);
348 inode
= ERR_PTR(-ENOMEM
);
352 if (inode
->i_state
& I_NEW
) {
353 struct nfs_inode
*nfsi
= NFS_I(inode
);
354 unsigned long now
= jiffies
;
356 /* We set i_ino for the few things that still rely on it,
360 /* We can't support update_atime(), since the server will reset it */
361 inode
->i_flags
|= S_NOATIME
|S_NOCMTIME
;
362 inode
->i_mode
= fattr
->mode
;
363 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) == 0
364 && nfs_server_capable(inode
, NFS_CAP_MODE
))
365 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
366 /* Why so? Because we want revalidate for devices/FIFOs, and
367 * that's precisely what we have in nfs_file_inode_operations.
369 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_inode_ops
;
370 if (S_ISREG(inode
->i_mode
)) {
371 inode
->i_fop
= NFS_SB(sb
)->nfs_client
->rpc_ops
->file_ops
;
372 inode
->i_data
.a_ops
= &nfs_file_aops
;
373 inode
->i_data
.backing_dev_info
= &NFS_SB(sb
)->backing_dev_info
;
374 } else if (S_ISDIR(inode
->i_mode
)) {
375 inode
->i_op
= NFS_SB(sb
)->nfs_client
->rpc_ops
->dir_inode_ops
;
376 inode
->i_fop
= &nfs_dir_operations
;
377 inode
->i_data
.a_ops
= &nfs_dir_aops
;
378 /* Deal with crossing mountpoints */
379 if (fattr
->valid
& NFS_ATTR_FATTR_MOUNTPOINT
||
380 fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
) {
381 if (fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
)
382 inode
->i_op
= &nfs_referral_inode_operations
;
384 inode
->i_op
= &nfs_mountpoint_inode_operations
;
386 inode
->i_flags
|= S_AUTOMOUNT
;
388 } else if (S_ISLNK(inode
->i_mode
))
389 inode
->i_op
= &nfs_symlink_inode_operations
;
391 init_special_inode(inode
, inode
->i_mode
, fattr
->rdev
);
393 memset(&inode
->i_atime
, 0, sizeof(inode
->i_atime
));
394 memset(&inode
->i_mtime
, 0, sizeof(inode
->i_mtime
));
395 memset(&inode
->i_ctime
, 0, sizeof(inode
->i_ctime
));
396 inode
->i_version
= 0;
399 inode
->i_uid
= make_kuid(&init_user_ns
, -2);
400 inode
->i_gid
= make_kgid(&init_user_ns
, -2);
402 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
406 nfsi
->read_cache_jiffies
= fattr
->time_start
;
407 nfsi
->attr_gencount
= fattr
->gencount
;
408 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
409 inode
->i_atime
= fattr
->atime
;
410 else if (nfs_server_capable(inode
, NFS_CAP_ATIME
))
411 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
412 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
413 inode
->i_mtime
= fattr
->mtime
;
414 else if (nfs_server_capable(inode
, NFS_CAP_MTIME
))
415 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
416 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
417 inode
->i_ctime
= fattr
->ctime
;
418 else if (nfs_server_capable(inode
, NFS_CAP_CTIME
))
419 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
420 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
421 inode
->i_version
= fattr
->change_attr
;
422 else if (nfs_server_capable(inode
, NFS_CAP_CHANGE_ATTR
))
423 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
424 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
425 inode
->i_size
= nfs_size_to_loff_t(fattr
->size
);
427 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
428 | NFS_INO_REVAL_PAGECACHE
;
429 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
)
430 set_nlink(inode
, fattr
->nlink
);
431 else if (nfs_server_capable(inode
, NFS_CAP_NLINK
))
432 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
433 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
)
434 inode
->i_uid
= fattr
->uid
;
435 else if (nfs_server_capable(inode
, NFS_CAP_OWNER
))
436 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
437 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
)
438 inode
->i_gid
= fattr
->gid
;
439 else if (nfs_server_capable(inode
, NFS_CAP_OWNER_GROUP
))
440 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
;
441 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
442 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
443 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
445 * report the blocks in 512byte units
447 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
450 nfs_setsecurity(inode
, fattr
, label
);
452 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
453 nfsi
->attrtimeo_timestamp
= now
;
454 nfsi
->access_cache
= RB_ROOT
;
456 nfs_fscache_init_inode(inode
);
458 unlock_new_inode(inode
);
460 nfs_refresh_inode(inode
, fattr
);
461 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
463 (long long)NFS_FILEID(inode
),
464 nfs_display_fhandle_hash(fh
),
465 atomic_read(&inode
->i_count
));
471 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode
));
474 EXPORT_SYMBOL_GPL(nfs_fhget
);
476 #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)
479 nfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
481 struct inode
*inode
= dentry
->d_inode
;
482 struct nfs_fattr
*fattr
;
485 nfs_inc_stats(inode
, NFSIOS_VFSSETATTR
);
487 /* skip mode change if it's just for clearing setuid/setgid */
488 if (attr
->ia_valid
& (ATTR_KILL_SUID
| ATTR_KILL_SGID
))
489 attr
->ia_valid
&= ~ATTR_MODE
;
491 if (attr
->ia_valid
& ATTR_SIZE
) {
492 if (!S_ISREG(inode
->i_mode
) || attr
->ia_size
== i_size_read(inode
))
493 attr
->ia_valid
&= ~ATTR_SIZE
;
496 /* Optimization: if the end result is no change, don't RPC */
497 attr
->ia_valid
&= NFS_VALID_ATTRS
;
498 if ((attr
->ia_valid
& ~(ATTR_FILE
|ATTR_OPEN
)) == 0)
501 trace_nfs_setattr_enter(inode
);
503 /* Write all dirty data */
504 if (S_ISREG(inode
->i_mode
)) {
505 nfs_inode_dio_wait(inode
);
509 fattr
= nfs_alloc_fattr();
513 * Return any delegations if we're going to change ACLs
515 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0)
516 NFS_PROTO(inode
)->return_delegation(inode
);
517 error
= NFS_PROTO(inode
)->setattr(dentry
, fattr
, attr
);
519 error
= nfs_refresh_inode(inode
, fattr
);
520 nfs_free_fattr(fattr
);
522 trace_nfs_setattr_exit(inode
, error
);
525 EXPORT_SYMBOL_GPL(nfs_setattr
);
528 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
529 * @inode: inode of the file used
530 * @offset: file offset to start truncating
532 * This is a copy of the common vmtruncate, but with the locking
533 * corrected to take into account the fact that NFS requires
534 * inode->i_size to be updated under the inode->i_lock.
536 static int nfs_vmtruncate(struct inode
* inode
, loff_t offset
)
540 err
= inode_newsize_ok(inode
, offset
);
544 spin_lock(&inode
->i_lock
);
545 i_size_write(inode
, offset
);
546 spin_unlock(&inode
->i_lock
);
548 truncate_pagecache(inode
, offset
);
554 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
555 * @inode: pointer to struct inode
556 * @attr: pointer to struct iattr
558 * Note: we do this in the *proc.c in order to ensure that
559 * it works for things like exclusive creates too.
561 void nfs_setattr_update_inode(struct inode
*inode
, struct iattr
*attr
)
563 if ((attr
->ia_valid
& (ATTR_MODE
|ATTR_UID
|ATTR_GID
)) != 0) {
564 spin_lock(&inode
->i_lock
);
565 if ((attr
->ia_valid
& ATTR_MODE
) != 0) {
566 int mode
= attr
->ia_mode
& S_IALLUGO
;
567 mode
|= inode
->i_mode
& ~S_IALLUGO
;
568 inode
->i_mode
= mode
;
570 if ((attr
->ia_valid
& ATTR_UID
) != 0)
571 inode
->i_uid
= attr
->ia_uid
;
572 if ((attr
->ia_valid
& ATTR_GID
) != 0)
573 inode
->i_gid
= attr
->ia_gid
;
574 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
575 spin_unlock(&inode
->i_lock
);
577 if ((attr
->ia_valid
& ATTR_SIZE
) != 0) {
578 nfs_inc_stats(inode
, NFSIOS_SETATTRTRUNC
);
579 nfs_vmtruncate(inode
, attr
->ia_size
);
582 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode
);
584 int nfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
586 struct inode
*inode
= dentry
->d_inode
;
587 int need_atime
= NFS_I(inode
)->cache_validity
& NFS_INO_INVALID_ATIME
;
590 trace_nfs_getattr_enter(inode
);
591 /* Flush out writes to the server in order to update c/mtime. */
592 if (S_ISREG(inode
->i_mode
)) {
593 nfs_inode_dio_wait(inode
);
594 err
= filemap_write_and_wait(inode
->i_mapping
);
600 * We may force a getattr if the user cares about atime.
602 * Note that we only have to check the vfsmount flags here:
603 * - NFS always sets S_NOATIME by so checking it would give a
605 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
606 * no point in checking those.
608 if ((mnt
->mnt_flags
& MNT_NOATIME
) ||
609 ((mnt
->mnt_flags
& MNT_NODIRATIME
) && S_ISDIR(inode
->i_mode
)))
613 err
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
615 err
= nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
617 generic_fillattr(inode
, stat
);
618 stat
->ino
= nfs_compat_user_ino64(NFS_FILEID(inode
));
621 trace_nfs_getattr_exit(inode
, err
);
624 EXPORT_SYMBOL_GPL(nfs_getattr
);
626 static void nfs_init_lock_context(struct nfs_lock_context
*l_ctx
)
628 atomic_set(&l_ctx
->count
, 1);
629 l_ctx
->lockowner
.l_owner
= current
->files
;
630 l_ctx
->lockowner
.l_pid
= current
->tgid
;
631 INIT_LIST_HEAD(&l_ctx
->list
);
632 nfs_iocounter_init(&l_ctx
->io_count
);
635 static struct nfs_lock_context
*__nfs_find_lock_context(struct nfs_open_context
*ctx
)
637 struct nfs_lock_context
*head
= &ctx
->lock_context
;
638 struct nfs_lock_context
*pos
= head
;
641 if (pos
->lockowner
.l_owner
!= current
->files
)
643 if (pos
->lockowner
.l_pid
!= current
->tgid
)
645 atomic_inc(&pos
->count
);
647 } while ((pos
= list_entry(pos
->list
.next
, typeof(*pos
), list
)) != head
);
651 struct nfs_lock_context
*nfs_get_lock_context(struct nfs_open_context
*ctx
)
653 struct nfs_lock_context
*res
, *new = NULL
;
654 struct inode
*inode
= ctx
->dentry
->d_inode
;
656 spin_lock(&inode
->i_lock
);
657 res
= __nfs_find_lock_context(ctx
);
659 spin_unlock(&inode
->i_lock
);
660 new = kmalloc(sizeof(*new), GFP_KERNEL
);
662 return ERR_PTR(-ENOMEM
);
663 nfs_init_lock_context(new);
664 spin_lock(&inode
->i_lock
);
665 res
= __nfs_find_lock_context(ctx
);
667 list_add_tail(&new->list
, &ctx
->lock_context
.list
);
668 new->open_context
= ctx
;
673 spin_unlock(&inode
->i_lock
);
678 void nfs_put_lock_context(struct nfs_lock_context
*l_ctx
)
680 struct nfs_open_context
*ctx
= l_ctx
->open_context
;
681 struct inode
*inode
= ctx
->dentry
->d_inode
;
683 if (!atomic_dec_and_lock(&l_ctx
->count
, &inode
->i_lock
))
685 list_del(&l_ctx
->list
);
686 spin_unlock(&inode
->i_lock
);
691 * nfs_close_context - Common close_context() routine NFSv2/v3
692 * @ctx: pointer to context
693 * @is_sync: is this a synchronous close
695 * always ensure that the attributes are up to date if we're mounted
696 * with close-to-open semantics
698 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
)
701 struct nfs_server
*server
;
703 if (!(ctx
->mode
& FMODE_WRITE
))
707 inode
= ctx
->dentry
->d_inode
;
708 if (!list_empty(&NFS_I(inode
)->open_files
))
710 server
= NFS_SERVER(inode
);
711 if (server
->flags
& NFS_MOUNT_NOCTO
)
713 nfs_revalidate_inode(server
, inode
);
715 EXPORT_SYMBOL_GPL(nfs_close_context
);
717 struct nfs_open_context
*alloc_nfs_open_context(struct dentry
*dentry
, fmode_t f_mode
)
719 struct nfs_open_context
*ctx
;
720 struct rpc_cred
*cred
= rpc_lookup_cred();
722 return ERR_CAST(cred
);
724 ctx
= kmalloc(sizeof(*ctx
), GFP_KERNEL
);
727 return ERR_PTR(-ENOMEM
);
729 nfs_sb_active(dentry
->d_sb
);
730 ctx
->dentry
= dget(dentry
);
736 nfs_init_lock_context(&ctx
->lock_context
);
737 ctx
->lock_context
.open_context
= ctx
;
738 INIT_LIST_HEAD(&ctx
->list
);
739 ctx
->mdsthreshold
= NULL
;
742 EXPORT_SYMBOL_GPL(alloc_nfs_open_context
);
744 struct nfs_open_context
*get_nfs_open_context(struct nfs_open_context
*ctx
)
747 atomic_inc(&ctx
->lock_context
.count
);
750 EXPORT_SYMBOL_GPL(get_nfs_open_context
);
752 static void __put_nfs_open_context(struct nfs_open_context
*ctx
, int is_sync
)
754 struct inode
*inode
= ctx
->dentry
->d_inode
;
755 struct super_block
*sb
= ctx
->dentry
->d_sb
;
757 if (!list_empty(&ctx
->list
)) {
758 if (!atomic_dec_and_lock(&ctx
->lock_context
.count
, &inode
->i_lock
))
760 list_del(&ctx
->list
);
761 spin_unlock(&inode
->i_lock
);
762 } else if (!atomic_dec_and_test(&ctx
->lock_context
.count
))
765 NFS_PROTO(inode
)->close_context(ctx
, is_sync
);
766 if (ctx
->cred
!= NULL
)
767 put_rpccred(ctx
->cred
);
770 kfree(ctx
->mdsthreshold
);
774 void put_nfs_open_context(struct nfs_open_context
*ctx
)
776 __put_nfs_open_context(ctx
, 0);
778 EXPORT_SYMBOL_GPL(put_nfs_open_context
);
781 * Ensure that mmap has a recent RPC credential for use when writing out
784 void nfs_inode_attach_open_context(struct nfs_open_context
*ctx
)
786 struct inode
*inode
= ctx
->dentry
->d_inode
;
787 struct nfs_inode
*nfsi
= NFS_I(inode
);
789 spin_lock(&inode
->i_lock
);
790 list_add(&ctx
->list
, &nfsi
->open_files
);
791 spin_unlock(&inode
->i_lock
);
793 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context
);
795 void nfs_file_set_open_context(struct file
*filp
, struct nfs_open_context
*ctx
)
797 filp
->private_data
= get_nfs_open_context(ctx
);
798 if (list_empty(&ctx
->list
))
799 nfs_inode_attach_open_context(ctx
);
801 EXPORT_SYMBOL_GPL(nfs_file_set_open_context
);
804 * Given an inode, search for an open context with the desired characteristics
806 struct nfs_open_context
*nfs_find_open_context(struct inode
*inode
, struct rpc_cred
*cred
, fmode_t mode
)
808 struct nfs_inode
*nfsi
= NFS_I(inode
);
809 struct nfs_open_context
*pos
, *ctx
= NULL
;
811 spin_lock(&inode
->i_lock
);
812 list_for_each_entry(pos
, &nfsi
->open_files
, list
) {
813 if (cred
!= NULL
&& pos
->cred
!= cred
)
815 if ((pos
->mode
& (FMODE_READ
|FMODE_WRITE
)) != mode
)
817 ctx
= get_nfs_open_context(pos
);
820 spin_unlock(&inode
->i_lock
);
824 static void nfs_file_clear_open_context(struct file
*filp
)
826 struct nfs_open_context
*ctx
= nfs_file_open_context(filp
);
829 struct inode
*inode
= ctx
->dentry
->d_inode
;
831 filp
->private_data
= NULL
;
832 spin_lock(&inode
->i_lock
);
833 list_move_tail(&ctx
->list
, &NFS_I(inode
)->open_files
);
834 spin_unlock(&inode
->i_lock
);
835 __put_nfs_open_context(ctx
, filp
->f_flags
& O_DIRECT
? 0 : 1);
840 * These allocate and release file read/write context information.
842 int nfs_open(struct inode
*inode
, struct file
*filp
)
844 struct nfs_open_context
*ctx
;
846 ctx
= alloc_nfs_open_context(filp
->f_path
.dentry
, filp
->f_mode
);
849 nfs_file_set_open_context(filp
, ctx
);
850 put_nfs_open_context(ctx
);
851 nfs_fscache_open_file(inode
, filp
);
855 int nfs_release(struct inode
*inode
, struct file
*filp
)
857 nfs_file_clear_open_context(filp
);
862 * This function is called whenever some part of NFS notices that
863 * the cached attributes have to be refreshed.
866 __nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
868 int status
= -ESTALE
;
869 struct nfs4_label
*label
= NULL
;
870 struct nfs_fattr
*fattr
= NULL
;
871 struct nfs_inode
*nfsi
= NFS_I(inode
);
873 dfprintk(PAGECACHE
, "NFS: revalidating (%s/%Ld)\n",
874 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
876 trace_nfs_revalidate_inode_enter(inode
);
878 if (is_bad_inode(inode
))
880 if (NFS_STALE(inode
))
884 fattr
= nfs_alloc_fattr();
888 nfs_inc_stats(inode
, NFSIOS_INODEREVALIDATE
);
890 label
= nfs4_label_alloc(NFS_SERVER(inode
), GFP_KERNEL
);
892 status
= PTR_ERR(label
);
896 status
= NFS_PROTO(inode
)->getattr(server
, NFS_FH(inode
), fattr
, label
);
898 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
900 (long long)NFS_FILEID(inode
), status
);
901 if (status
== -ESTALE
) {
902 nfs_zap_caches(inode
);
903 if (!S_ISDIR(inode
->i_mode
))
904 set_bit(NFS_INO_STALE
, &NFS_I(inode
)->flags
);
909 status
= nfs_refresh_inode(inode
, fattr
);
911 dfprintk(PAGECACHE
, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
913 (long long)NFS_FILEID(inode
), status
);
917 if (nfsi
->cache_validity
& NFS_INO_INVALID_ACL
)
918 nfs_zap_acl_cache(inode
);
920 nfs_setsecurity(inode
, fattr
, label
);
922 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) revalidation complete\n",
924 (long long)NFS_FILEID(inode
));
927 nfs4_label_free(label
);
929 nfs_free_fattr(fattr
);
930 trace_nfs_revalidate_inode_exit(inode
, status
);
934 int nfs_attribute_timeout(struct inode
*inode
)
936 struct nfs_inode
*nfsi
= NFS_I(inode
);
938 return !time_in_range_open(jiffies
, nfsi
->read_cache_jiffies
, nfsi
->read_cache_jiffies
+ nfsi
->attrtimeo
);
941 int nfs_attribute_cache_expired(struct inode
*inode
)
943 if (nfs_have_delegated_attributes(inode
))
945 return nfs_attribute_timeout(inode
);
949 * nfs_revalidate_inode - Revalidate the inode attributes
950 * @server - pointer to nfs_server struct
951 * @inode - pointer to inode struct
953 * Updates inode attribute information by retrieving the data from the server.
955 int nfs_revalidate_inode(struct nfs_server
*server
, struct inode
*inode
)
957 if (!(NFS_I(inode
)->cache_validity
&
958 (NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_LABEL
))
959 && !nfs_attribute_cache_expired(inode
))
960 return NFS_STALE(inode
) ? -ESTALE
: 0;
961 return __nfs_revalidate_inode(server
, inode
);
963 EXPORT_SYMBOL_GPL(nfs_revalidate_inode
);
965 static int nfs_invalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
967 struct nfs_inode
*nfsi
= NFS_I(inode
);
970 if (mapping
->nrpages
!= 0) {
971 if (S_ISREG(inode
->i_mode
)) {
972 ret
= nfs_sync_mapping(mapping
);
976 ret
= invalidate_inode_pages2(mapping
);
980 spin_lock(&inode
->i_lock
);
981 nfsi
->cache_validity
&= ~NFS_INO_INVALID_DATA
;
982 if (S_ISDIR(inode
->i_mode
))
983 memset(nfsi
->cookieverf
, 0, sizeof(nfsi
->cookieverf
));
984 spin_unlock(&inode
->i_lock
);
985 nfs_inc_stats(inode
, NFSIOS_DATAINVALIDATE
);
986 nfs_fscache_wait_on_invalidate(inode
);
988 dfprintk(PAGECACHE
, "NFS: (%s/%Ld) data cache invalidated\n",
989 inode
->i_sb
->s_id
, (long long)NFS_FILEID(inode
));
993 static bool nfs_mapping_need_revalidate_inode(struct inode
*inode
)
995 if (nfs_have_delegated_attributes(inode
))
997 return (NFS_I(inode
)->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
998 || nfs_attribute_timeout(inode
)
1003 * nfs_revalidate_mapping - Revalidate the pagecache
1004 * @inode - pointer to host inode
1005 * @mapping - pointer to mapping
1007 int nfs_revalidate_mapping(struct inode
*inode
, struct address_space
*mapping
)
1009 struct nfs_inode
*nfsi
= NFS_I(inode
);
1012 /* swapfiles are not supposed to be shared. */
1013 if (IS_SWAPFILE(inode
))
1016 if (nfs_mapping_need_revalidate_inode(inode
)) {
1017 ret
= __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
1021 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
) {
1022 trace_nfs_invalidate_mapping_enter(inode
);
1023 ret
= nfs_invalidate_mapping(inode
, mapping
);
1024 trace_nfs_invalidate_mapping_exit(inode
, ret
);
1031 static unsigned long nfs_wcc_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1033 struct nfs_inode
*nfsi
= NFS_I(inode
);
1034 unsigned long ret
= 0;
1036 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
)
1037 && (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
)
1038 && inode
->i_version
== fattr
->pre_change_attr
) {
1039 inode
->i_version
= fattr
->change_attr
;
1040 if (S_ISDIR(inode
->i_mode
))
1041 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
1042 ret
|= NFS_INO_INVALID_ATTR
;
1044 /* If we have atomic WCC data, we may update some attributes */
1045 if ((fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
)
1046 && (fattr
->valid
& NFS_ATTR_FATTR_CTIME
)
1047 && timespec_equal(&inode
->i_ctime
, &fattr
->pre_ctime
)) {
1048 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1049 ret
|= NFS_INO_INVALID_ATTR
;
1052 if ((fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
)
1053 && (fattr
->valid
& NFS_ATTR_FATTR_MTIME
)
1054 && timespec_equal(&inode
->i_mtime
, &fattr
->pre_mtime
)) {
1055 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1056 if (S_ISDIR(inode
->i_mode
))
1057 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
1058 ret
|= NFS_INO_INVALID_ATTR
;
1060 if ((fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
)
1061 && (fattr
->valid
& NFS_ATTR_FATTR_SIZE
)
1062 && i_size_read(inode
) == nfs_size_to_loff_t(fattr
->pre_size
)
1063 && nfsi
->npages
== 0) {
1064 i_size_write(inode
, nfs_size_to_loff_t(fattr
->size
));
1065 ret
|= NFS_INO_INVALID_ATTR
;
1068 if (nfsi
->cache_validity
& NFS_INO_INVALID_DATA
)
1069 nfs_fscache_invalidate(inode
);
1075 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1076 * @inode - pointer to inode
1077 * @fattr - updated attributes
1079 * Verifies the attribute cache. If we have just changed the attributes,
1080 * so that fattr carries weak cache consistency data, then it may
1081 * also update the ctime/mtime/change_attribute.
1083 static int nfs_check_inode_attributes(struct inode
*inode
, struct nfs_fattr
*fattr
)
1085 struct nfs_inode
*nfsi
= NFS_I(inode
);
1086 loff_t cur_size
, new_isize
;
1087 unsigned long invalid
= 0;
1090 if (nfs_have_delegated_attributes(inode
))
1092 /* Has the inode gone and changed behind our back? */
1093 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
)
1095 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
))
1098 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
1099 inode
->i_version
!= fattr
->change_attr
)
1100 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1102 /* Verify a few of the more important attributes */
1103 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) && !timespec_equal(&inode
->i_mtime
, &fattr
->mtime
))
1104 invalid
|= NFS_INO_INVALID_ATTR
;
1106 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
1107 cur_size
= i_size_read(inode
);
1108 new_isize
= nfs_size_to_loff_t(fattr
->size
);
1109 if (cur_size
!= new_isize
&& nfsi
->npages
== 0)
1110 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1113 /* Have any file permissions changed? */
1114 if ((fattr
->valid
& NFS_ATTR_FATTR_MODE
) && (inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
))
1115 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1116 if ((fattr
->valid
& NFS_ATTR_FATTR_OWNER
) && !uid_eq(inode
->i_uid
, fattr
->uid
))
1117 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1118 if ((fattr
->valid
& NFS_ATTR_FATTR_GROUP
) && !gid_eq(inode
->i_gid
, fattr
->gid
))
1119 invalid
|= NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
;
1121 /* Has the link count changed? */
1122 if ((fattr
->valid
& NFS_ATTR_FATTR_NLINK
) && inode
->i_nlink
!= fattr
->nlink
)
1123 invalid
|= NFS_INO_INVALID_ATTR
;
1125 if ((fattr
->valid
& NFS_ATTR_FATTR_ATIME
) && !timespec_equal(&inode
->i_atime
, &fattr
->atime
))
1126 invalid
|= NFS_INO_INVALID_ATIME
;
1129 nfsi
->cache_validity
|= invalid
;
1131 nfsi
->read_cache_jiffies
= fattr
->time_start
;
1135 static int nfs_ctime_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1137 if (!(fattr
->valid
& NFS_ATTR_FATTR_CTIME
))
1139 return timespec_compare(&fattr
->ctime
, &inode
->i_ctime
) > 0;
1142 static int nfs_size_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1144 if (!(fattr
->valid
& NFS_ATTR_FATTR_SIZE
))
1146 return nfs_size_to_loff_t(fattr
->size
) > i_size_read(inode
);
1149 static atomic_long_t nfs_attr_generation_counter
;
1151 static unsigned long nfs_read_attr_generation_counter(void)
1153 return atomic_long_read(&nfs_attr_generation_counter
);
1156 unsigned long nfs_inc_attr_generation_counter(void)
1158 return atomic_long_inc_return(&nfs_attr_generation_counter
);
1161 void nfs_fattr_init(struct nfs_fattr
*fattr
)
1164 fattr
->time_start
= jiffies
;
1165 fattr
->gencount
= nfs_inc_attr_generation_counter();
1166 fattr
->owner_name
= NULL
;
1167 fattr
->group_name
= NULL
;
1169 EXPORT_SYMBOL_GPL(nfs_fattr_init
);
1171 struct nfs_fattr
*nfs_alloc_fattr(void)
1173 struct nfs_fattr
*fattr
;
1175 fattr
= kmalloc(sizeof(*fattr
), GFP_NOFS
);
1177 nfs_fattr_init(fattr
);
1180 EXPORT_SYMBOL_GPL(nfs_alloc_fattr
);
1182 struct nfs_fh
*nfs_alloc_fhandle(void)
1186 fh
= kmalloc(sizeof(struct nfs_fh
), GFP_NOFS
);
1191 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle
);
1195 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1196 * in the same way that wireshark does
1200 * For debugging only.
1202 u32
_nfs_display_fhandle_hash(const struct nfs_fh
*fh
)
1204 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1205 * not on the result */
1206 return nfs_fhandle_hash(fh
);
1208 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash
);
1211 * _nfs_display_fhandle - display an NFS file handle on the console
1213 * @fh: file handle to display
1214 * @caption: display caption
1216 * For debugging only.
1218 void _nfs_display_fhandle(const struct nfs_fh
*fh
, const char *caption
)
1222 if (fh
== NULL
|| fh
->size
== 0) {
1223 printk(KERN_DEFAULT
"%s at %p is empty\n", caption
, fh
);
1227 printk(KERN_DEFAULT
"%s at %p is %u bytes, crc: 0x%08x:\n",
1228 caption
, fh
, fh
->size
, _nfs_display_fhandle_hash(fh
));
1229 for (i
= 0; i
< fh
->size
; i
+= 16) {
1230 __be32
*pos
= (__be32
*)&fh
->data
[i
];
1232 switch ((fh
->size
- i
- 1) >> 2) {
1234 printk(KERN_DEFAULT
" %08x\n",
1238 printk(KERN_DEFAULT
" %08x %08x\n",
1239 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1));
1242 printk(KERN_DEFAULT
" %08x %08x %08x\n",
1243 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1),
1244 be32_to_cpup(pos
+ 2));
1247 printk(KERN_DEFAULT
" %08x %08x %08x %08x\n",
1248 be32_to_cpup(pos
), be32_to_cpup(pos
+ 1),
1249 be32_to_cpup(pos
+ 2), be32_to_cpup(pos
+ 3));
1253 EXPORT_SYMBOL_GPL(_nfs_display_fhandle
);
1257 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1258 * @inode - pointer to inode
1259 * @fattr - attributes
1261 * Attempt to divine whether or not an RPC call reply carrying stale
1262 * attributes got scheduled after another call carrying updated ones.
1264 * To do so, the function first assumes that a more recent ctime means
1265 * that the attributes in fattr are newer, however it also attempt to
1266 * catch the case where ctime either didn't change, or went backwards
1267 * (if someone reset the clock on the server) by looking at whether
1268 * or not this RPC call was started after the inode was last updated.
1269 * Note also the check for wraparound of 'attr_gencount'
1271 * The function returns 'true' if it thinks the attributes in 'fattr' are
1272 * more recent than the ones cached in the inode.
1275 static int nfs_inode_attrs_need_update(const struct inode
*inode
, const struct nfs_fattr
*fattr
)
1277 const struct nfs_inode
*nfsi
= NFS_I(inode
);
1279 return ((long)fattr
->gencount
- (long)nfsi
->attr_gencount
) > 0 ||
1280 nfs_ctime_need_update(inode
, fattr
) ||
1281 nfs_size_need_update(inode
, fattr
) ||
1282 ((long)nfsi
->attr_gencount
- (long)nfs_read_attr_generation_counter() > 0);
1285 static int nfs_refresh_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1289 trace_nfs_refresh_inode_enter(inode
);
1291 if (nfs_inode_attrs_need_update(inode
, fattr
))
1292 ret
= nfs_update_inode(inode
, fattr
);
1294 ret
= nfs_check_inode_attributes(inode
, fattr
);
1296 trace_nfs_refresh_inode_exit(inode
, ret
);
1301 * nfs_refresh_inode - try to update the inode attribute cache
1302 * @inode - pointer to inode
1303 * @fattr - updated attributes
1305 * Check that an RPC call that returned attributes has not overlapped with
1306 * other recent updates of the inode metadata, then decide whether it is
1307 * safe to do a full update of the inode attributes, or whether just to
1308 * call nfs_check_inode_attributes.
1310 int nfs_refresh_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1314 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1316 spin_lock(&inode
->i_lock
);
1317 status
= nfs_refresh_inode_locked(inode
, fattr
);
1318 spin_unlock(&inode
->i_lock
);
1322 EXPORT_SYMBOL_GPL(nfs_refresh_inode
);
1324 static int nfs_post_op_update_inode_locked(struct inode
*inode
, struct nfs_fattr
*fattr
)
1326 struct nfs_inode
*nfsi
= NFS_I(inode
);
1328 nfsi
->cache_validity
|= NFS_INO_INVALID_ATTR
|NFS_INO_REVAL_PAGECACHE
;
1329 if (S_ISDIR(inode
->i_mode
)) {
1330 nfsi
->cache_validity
|= NFS_INO_INVALID_DATA
;
1331 nfs_fscache_invalidate(inode
);
1333 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0)
1335 return nfs_refresh_inode_locked(inode
, fattr
);
1339 * nfs_post_op_update_inode - try to update the inode attribute cache
1340 * @inode - pointer to inode
1341 * @fattr - updated attributes
1343 * After an operation that has changed the inode metadata, mark the
1344 * attribute cache as being invalid, then try to update it.
1346 * NB: if the server didn't return any post op attributes, this
1347 * function will force the retrieval of attributes before the next
1348 * NFS request. Thus it should be used only for operations that
1349 * are expected to change one or more attributes, to avoid
1350 * unnecessary NFS requests and trips through nfs_update_inode().
1352 int nfs_post_op_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1356 spin_lock(&inode
->i_lock
);
1357 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1358 spin_unlock(&inode
->i_lock
);
1362 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode
);
1365 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1366 * @inode - pointer to inode
1367 * @fattr - updated attributes
1369 * After an operation that has changed the inode metadata, mark the
1370 * attribute cache as being invalid, then try to update it. Fake up
1371 * weak cache consistency data, if none exist.
1373 * This function is mainly designed to be used by the ->write_done() functions.
1375 int nfs_post_op_update_inode_force_wcc(struct inode
*inode
, struct nfs_fattr
*fattr
)
1379 spin_lock(&inode
->i_lock
);
1380 /* Don't do a WCC update if these attributes are already stale */
1381 if ((fattr
->valid
& NFS_ATTR_FATTR
) == 0 ||
1382 !nfs_inode_attrs_need_update(inode
, fattr
)) {
1383 fattr
->valid
&= ~(NFS_ATTR_FATTR_PRECHANGE
1384 | NFS_ATTR_FATTR_PRESIZE
1385 | NFS_ATTR_FATTR_PREMTIME
1386 | NFS_ATTR_FATTR_PRECTIME
);
1389 if ((fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) != 0 &&
1390 (fattr
->valid
& NFS_ATTR_FATTR_PRECHANGE
) == 0) {
1391 fattr
->pre_change_attr
= inode
->i_version
;
1392 fattr
->valid
|= NFS_ATTR_FATTR_PRECHANGE
;
1394 if ((fattr
->valid
& NFS_ATTR_FATTR_CTIME
) != 0 &&
1395 (fattr
->valid
& NFS_ATTR_FATTR_PRECTIME
) == 0) {
1396 memcpy(&fattr
->pre_ctime
, &inode
->i_ctime
, sizeof(fattr
->pre_ctime
));
1397 fattr
->valid
|= NFS_ATTR_FATTR_PRECTIME
;
1399 if ((fattr
->valid
& NFS_ATTR_FATTR_MTIME
) != 0 &&
1400 (fattr
->valid
& NFS_ATTR_FATTR_PREMTIME
) == 0) {
1401 memcpy(&fattr
->pre_mtime
, &inode
->i_mtime
, sizeof(fattr
->pre_mtime
));
1402 fattr
->valid
|= NFS_ATTR_FATTR_PREMTIME
;
1404 if ((fattr
->valid
& NFS_ATTR_FATTR_SIZE
) != 0 &&
1405 (fattr
->valid
& NFS_ATTR_FATTR_PRESIZE
) == 0) {
1406 fattr
->pre_size
= i_size_read(inode
);
1407 fattr
->valid
|= NFS_ATTR_FATTR_PRESIZE
;
1410 status
= nfs_post_op_update_inode_locked(inode
, fattr
);
1411 spin_unlock(&inode
->i_lock
);
1414 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc
);
1417 * Many nfs protocol calls return the new file attributes after
1418 * an operation. Here we update the inode to reflect the state
1419 * of the server's inode.
1421 * This is a bit tricky because we have to make sure all dirty pages
1422 * have been sent off to the server before calling invalidate_inode_pages.
1423 * To make sure no other process adds more write requests while we try
1424 * our best to flush them, we make them sleep during the attribute refresh.
1426 * A very similar scenario holds for the dir cache.
1428 static int nfs_update_inode(struct inode
*inode
, struct nfs_fattr
*fattr
)
1430 struct nfs_server
*server
;
1431 struct nfs_inode
*nfsi
= NFS_I(inode
);
1432 loff_t cur_isize
, new_isize
;
1433 unsigned long invalid
= 0;
1434 unsigned long now
= jiffies
;
1435 unsigned long save_cache_validity
;
1437 dfprintk(VFS
, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1438 __func__
, inode
->i_sb
->s_id
, inode
->i_ino
,
1439 nfs_display_fhandle_hash(NFS_FH(inode
)),
1440 atomic_read(&inode
->i_count
), fattr
->valid
);
1442 if ((fattr
->valid
& NFS_ATTR_FATTR_FILEID
) && nfsi
->fileid
!= fattr
->fileid
) {
1443 printk(KERN_ERR
"NFS: server %s error: fileid changed\n"
1444 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1445 NFS_SERVER(inode
)->nfs_client
->cl_hostname
,
1446 inode
->i_sb
->s_id
, (long long)nfsi
->fileid
,
1447 (long long)fattr
->fileid
);
1452 * Make sure the inode's type hasn't changed.
1454 if ((fattr
->valid
& NFS_ATTR_FATTR_TYPE
) && (inode
->i_mode
& S_IFMT
) != (fattr
->mode
& S_IFMT
)) {
1456 * Big trouble! The inode has become a different object.
1458 printk(KERN_DEBUG
"NFS: %s: inode %ld mode changed, %07o to %07o\n",
1459 __func__
, inode
->i_ino
, inode
->i_mode
, fattr
->mode
);
1463 server
= NFS_SERVER(inode
);
1464 /* Update the fsid? */
1465 if (S_ISDIR(inode
->i_mode
) && (fattr
->valid
& NFS_ATTR_FATTR_FSID
) &&
1466 !nfs_fsid_equal(&server
->fsid
, &fattr
->fsid
) &&
1467 !IS_AUTOMOUNT(inode
))
1468 server
->fsid
= fattr
->fsid
;
1471 * Update the read time so we don't revalidate too often.
1473 nfsi
->read_cache_jiffies
= fattr
->time_start
;
1475 save_cache_validity
= nfsi
->cache_validity
;
1476 nfsi
->cache_validity
&= ~(NFS_INO_INVALID_ATTR
1477 | NFS_INO_INVALID_ATIME
1478 | NFS_INO_REVAL_FORCED
1479 | NFS_INO_REVAL_PAGECACHE
);
1481 /* Do atomic weak cache consistency updates */
1482 invalid
|= nfs_wcc_update_inode(inode
, fattr
);
1484 /* More cache consistency checks */
1485 if (fattr
->valid
& NFS_ATTR_FATTR_CHANGE
) {
1486 if (inode
->i_version
!= fattr
->change_attr
) {
1487 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1488 inode
->i_sb
->s_id
, inode
->i_ino
);
1489 invalid
|= NFS_INO_INVALID_ATTR
1490 | NFS_INO_INVALID_DATA
1491 | NFS_INO_INVALID_ACCESS
1492 | NFS_INO_INVALID_ACL
1493 | NFS_INO_REVAL_PAGECACHE
;
1494 if (S_ISDIR(inode
->i_mode
))
1495 nfs_force_lookup_revalidate(inode
);
1496 inode
->i_version
= fattr
->change_attr
;
1498 } else if (server
->caps
& NFS_CAP_CHANGE_ATTR
)
1499 invalid
|= save_cache_validity
;
1501 if (fattr
->valid
& NFS_ATTR_FATTR_MTIME
) {
1502 memcpy(&inode
->i_mtime
, &fattr
->mtime
, sizeof(inode
->i_mtime
));
1503 } else if (server
->caps
& NFS_CAP_MTIME
)
1504 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1505 | NFS_INO_REVAL_FORCED
);
1507 if (fattr
->valid
& NFS_ATTR_FATTR_CTIME
) {
1508 memcpy(&inode
->i_ctime
, &fattr
->ctime
, sizeof(inode
->i_ctime
));
1509 } else if (server
->caps
& NFS_CAP_CTIME
)
1510 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1511 | NFS_INO_REVAL_FORCED
);
1513 /* Check if our cached file size is stale */
1514 if (fattr
->valid
& NFS_ATTR_FATTR_SIZE
) {
1515 new_isize
= nfs_size_to_loff_t(fattr
->size
);
1516 cur_isize
= i_size_read(inode
);
1517 if (new_isize
!= cur_isize
) {
1518 /* Do we perhaps have any outstanding writes, or has
1519 * the file grown beyond our last write? */
1520 if ((nfsi
->npages
== 0 && !test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) ||
1521 new_isize
> cur_isize
) {
1522 i_size_write(inode
, new_isize
);
1523 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_DATA
;
1525 dprintk("NFS: isize change on server for file %s/%ld "
1529 (long long)cur_isize
,
1530 (long long)new_isize
);
1533 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1534 | NFS_INO_REVAL_PAGECACHE
1535 | NFS_INO_REVAL_FORCED
);
1538 if (fattr
->valid
& NFS_ATTR_FATTR_ATIME
)
1539 memcpy(&inode
->i_atime
, &fattr
->atime
, sizeof(inode
->i_atime
));
1540 else if (server
->caps
& NFS_CAP_ATIME
)
1541 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATIME
1542 | NFS_INO_REVAL_FORCED
);
1544 if (fattr
->valid
& NFS_ATTR_FATTR_MODE
) {
1545 if ((inode
->i_mode
& S_IALLUGO
) != (fattr
->mode
& S_IALLUGO
)) {
1546 umode_t newmode
= inode
->i_mode
& S_IFMT
;
1547 newmode
|= fattr
->mode
& S_IALLUGO
;
1548 inode
->i_mode
= newmode
;
1549 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1551 } else if (server
->caps
& NFS_CAP_MODE
)
1552 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1553 | NFS_INO_INVALID_ACCESS
1554 | NFS_INO_INVALID_ACL
1555 | NFS_INO_REVAL_FORCED
);
1557 if (fattr
->valid
& NFS_ATTR_FATTR_OWNER
) {
1558 if (!uid_eq(inode
->i_uid
, fattr
->uid
)) {
1559 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1560 inode
->i_uid
= fattr
->uid
;
1562 } else if (server
->caps
& NFS_CAP_OWNER
)
1563 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1564 | NFS_INO_INVALID_ACCESS
1565 | NFS_INO_INVALID_ACL
1566 | NFS_INO_REVAL_FORCED
);
1568 if (fattr
->valid
& NFS_ATTR_FATTR_GROUP
) {
1569 if (!gid_eq(inode
->i_gid
, fattr
->gid
)) {
1570 invalid
|= NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_ACCESS
|NFS_INO_INVALID_ACL
;
1571 inode
->i_gid
= fattr
->gid
;
1573 } else if (server
->caps
& NFS_CAP_OWNER_GROUP
)
1574 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1575 | NFS_INO_INVALID_ACCESS
1576 | NFS_INO_INVALID_ACL
1577 | NFS_INO_REVAL_FORCED
);
1579 if (fattr
->valid
& NFS_ATTR_FATTR_NLINK
) {
1580 if (inode
->i_nlink
!= fattr
->nlink
) {
1581 invalid
|= NFS_INO_INVALID_ATTR
;
1582 if (S_ISDIR(inode
->i_mode
))
1583 invalid
|= NFS_INO_INVALID_DATA
;
1584 set_nlink(inode
, fattr
->nlink
);
1586 } else if (server
->caps
& NFS_CAP_NLINK
)
1587 invalid
|= save_cache_validity
& (NFS_INO_INVALID_ATTR
1588 | NFS_INO_REVAL_FORCED
);
1590 if (fattr
->valid
& NFS_ATTR_FATTR_SPACE_USED
) {
1592 * report the blocks in 512byte units
1594 inode
->i_blocks
= nfs_calc_block_size(fattr
->du
.nfs3
.used
);
1596 if (fattr
->valid
& NFS_ATTR_FATTR_BLOCKS_USED
)
1597 inode
->i_blocks
= fattr
->du
.nfs2
.blocks
;
1599 /* Update attrtimeo value if we're out of the unstable period */
1600 if (invalid
& (NFS_INO_INVALID_ATTR
|NFS_INO_INVALID_LABEL
)) {
1601 nfs_inc_stats(inode
, NFSIOS_ATTRINVALIDATE
);
1602 nfsi
->attrtimeo
= NFS_MINATTRTIMEO(inode
);
1603 nfsi
->attrtimeo_timestamp
= now
;
1604 nfsi
->attr_gencount
= nfs_inc_attr_generation_counter();
1606 if (!time_in_range_open(now
, nfsi
->attrtimeo_timestamp
, nfsi
->attrtimeo_timestamp
+ nfsi
->attrtimeo
)) {
1607 if ((nfsi
->attrtimeo
<<= 1) > NFS_MAXATTRTIMEO(inode
))
1608 nfsi
->attrtimeo
= NFS_MAXATTRTIMEO(inode
);
1609 nfsi
->attrtimeo_timestamp
= now
;
1612 invalid
&= ~NFS_INO_INVALID_ATTR
;
1613 invalid
&= ~NFS_INO_INVALID_LABEL
;
1614 /* Don't invalidate the data if we were to blame */
1615 if (!(S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
)
1616 || S_ISLNK(inode
->i_mode
)))
1617 invalid
&= ~NFS_INO_INVALID_DATA
;
1618 if (!NFS_PROTO(inode
)->have_delegation(inode
, FMODE_READ
) ||
1619 (save_cache_validity
& NFS_INO_REVAL_FORCED
))
1620 nfsi
->cache_validity
|= invalid
;
1622 if (invalid
& NFS_INO_INVALID_DATA
)
1623 nfs_fscache_invalidate(inode
);
1628 * No need to worry about unhashing the dentry, as the
1629 * lookup validation will know that the inode is bad.
1630 * (But we fall through to invalidate the caches.)
1632 nfs_invalidate_inode(inode
);
1636 struct inode
*nfs_alloc_inode(struct super_block
*sb
)
1638 struct nfs_inode
*nfsi
;
1639 nfsi
= (struct nfs_inode
*)kmem_cache_alloc(nfs_inode_cachep
, GFP_KERNEL
);
1643 nfsi
->cache_validity
= 0UL;
1644 #ifdef CONFIG_NFS_V3_ACL
1645 nfsi
->acl_access
= ERR_PTR(-EAGAIN
);
1646 nfsi
->acl_default
= ERR_PTR(-EAGAIN
);
1648 #if IS_ENABLED(CONFIG_NFS_V4)
1649 nfsi
->nfs4_acl
= NULL
;
1650 #endif /* CONFIG_NFS_V4 */
1651 return &nfsi
->vfs_inode
;
1653 EXPORT_SYMBOL_GPL(nfs_alloc_inode
);
1655 static void nfs_i_callback(struct rcu_head
*head
)
1657 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
1658 kmem_cache_free(nfs_inode_cachep
, NFS_I(inode
));
1661 void nfs_destroy_inode(struct inode
*inode
)
1663 call_rcu(&inode
->i_rcu
, nfs_i_callback
);
1665 EXPORT_SYMBOL_GPL(nfs_destroy_inode
);
1667 static inline void nfs4_init_once(struct nfs_inode
*nfsi
)
1669 #if IS_ENABLED(CONFIG_NFS_V4)
1670 INIT_LIST_HEAD(&nfsi
->open_states
);
1671 nfsi
->delegation
= NULL
;
1672 nfsi
->delegation_state
= 0;
1673 init_rwsem(&nfsi
->rwsem
);
1674 nfsi
->layout
= NULL
;
1678 static void init_once(void *foo
)
1680 struct nfs_inode
*nfsi
= (struct nfs_inode
*) foo
;
1682 inode_init_once(&nfsi
->vfs_inode
);
1683 INIT_LIST_HEAD(&nfsi
->open_files
);
1684 INIT_LIST_HEAD(&nfsi
->access_cache_entry_lru
);
1685 INIT_LIST_HEAD(&nfsi
->access_cache_inode_lru
);
1686 INIT_LIST_HEAD(&nfsi
->commit_info
.list
);
1688 nfsi
->commit_info
.ncommit
= 0;
1689 atomic_set(&nfsi
->commit_info
.rpcs_out
, 0);
1690 atomic_set(&nfsi
->silly_count
, 1);
1691 INIT_HLIST_HEAD(&nfsi
->silly_list
);
1692 init_waitqueue_head(&nfsi
->waitqueue
);
1693 nfs4_init_once(nfsi
);
1696 static int __init
nfs_init_inodecache(void)
1698 nfs_inode_cachep
= kmem_cache_create("nfs_inode_cache",
1699 sizeof(struct nfs_inode
),
1700 0, (SLAB_RECLAIM_ACCOUNT
|
1703 if (nfs_inode_cachep
== NULL
)
1709 static void nfs_destroy_inodecache(void)
1712 * Make sure all delayed rcu free inodes are flushed before we
1716 kmem_cache_destroy(nfs_inode_cachep
);
1719 struct workqueue_struct
*nfsiod_workqueue
;
1720 EXPORT_SYMBOL_GPL(nfsiod_workqueue
);
1723 * start up the nfsiod workqueue
1725 static int nfsiod_start(void)
1727 struct workqueue_struct
*wq
;
1728 dprintk("RPC: creating workqueue nfsiod\n");
1729 wq
= alloc_workqueue("nfsiod", WQ_MEM_RECLAIM
, 0);
1732 nfsiod_workqueue
= wq
;
1737 * Destroy the nfsiod workqueue
1739 static void nfsiod_stop(void)
1741 struct workqueue_struct
*wq
;
1743 wq
= nfsiod_workqueue
;
1746 nfsiod_workqueue
= NULL
;
1747 destroy_workqueue(wq
);
1751 EXPORT_SYMBOL_GPL(nfs_net_id
);
1753 static int nfs_net_init(struct net
*net
)
1755 nfs_clients_init(net
);
1759 static void nfs_net_exit(struct net
*net
)
1761 nfs_cleanup_cb_ident_idr(net
);
1764 static struct pernet_operations nfs_net_ops
= {
1765 .init
= nfs_net_init
,
1766 .exit
= nfs_net_exit
,
1768 .size
= sizeof(struct nfs_net
),
1774 static int __init
init_nfs_fs(void)
1778 err
= register_pernet_subsys(&nfs_net_ops
);
1782 err
= nfs_fscache_register();
1786 err
= nfsiod_start();
1790 err
= nfs_fs_proc_init();
1794 err
= nfs_init_nfspagecache();
1798 err
= nfs_init_inodecache();
1802 err
= nfs_init_readpagecache();
1806 err
= nfs_init_writepagecache();
1810 err
= nfs_init_directcache();
1814 #ifdef CONFIG_PROC_FS
1815 rpc_proc_register(&init_net
, &nfs_rpcstat
);
1817 if ((err
= register_nfs_fs()) != 0)
1822 #ifdef CONFIG_PROC_FS
1823 rpc_proc_unregister(&init_net
, "nfs");
1825 nfs_destroy_directcache();
1827 nfs_destroy_writepagecache();
1829 nfs_destroy_readpagecache();
1831 nfs_destroy_inodecache();
1833 nfs_destroy_nfspagecache();
1839 nfs_fscache_unregister();
1841 unregister_pernet_subsys(&nfs_net_ops
);
1846 static void __exit
exit_nfs_fs(void)
1848 nfs_destroy_directcache();
1849 nfs_destroy_writepagecache();
1850 nfs_destroy_readpagecache();
1851 nfs_destroy_inodecache();
1852 nfs_destroy_nfspagecache();
1853 nfs_fscache_unregister();
1854 unregister_pernet_subsys(&nfs_net_ops
);
1855 #ifdef CONFIG_PROC_FS
1856 rpc_proc_unregister(&init_net
, "nfs");
1858 unregister_nfs_fs();
1863 /* Not quite true; I just maintain it */
1864 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1865 MODULE_LICENSE("GPL");
1866 module_param(enable_ino64
, bool, 0644);
1868 module_init(init_nfs_fs
)
1869 module_exit(exit_nfs_fs
)