4 * Copyright (C) 1992 Rick Sladkey
6 * nfs directory handling functions
8 * 10 Apr 1996 Added silly rename for unlink --okir
9 * 28 Sep 1996 Improved directory cache --okir
10 * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de
11 * Re-implemented silly rename for unlink, newly implemented
12 * silly rename for nfs_rename() following the suggestions
13 * of Olaf Kirch (okir) found in this file.
14 * Following Linus comments on my original hack, this version
15 * depends only on the dcache stuff and doesn't touch the inode
16 * layer (iput() and friends).
17 * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM
20 #include <linux/time.h>
21 #include <linux/errno.h>
22 #include <linux/stat.h>
23 #include <linux/fcntl.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
28 #include <linux/sunrpc/clnt.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/pagemap.h>
32 #include <linux/smp_lock.h>
33 #include <linux/namei.h>
36 #include "delegation.h"
38 #define NFS_PARANOIA 1
39 /* #define NFS_DEBUG_VERBOSE 1 */
41 static int nfs_opendir(struct inode
*, struct file
*);
42 static int nfs_readdir(struct file
*, void *, filldir_t
);
43 static struct dentry
*nfs_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
44 static int nfs_create(struct inode
*, struct dentry
*, int, struct nameidata
*);
45 static int nfs_mkdir(struct inode
*, struct dentry
*, int);
46 static int nfs_rmdir(struct inode
*, struct dentry
*);
47 static int nfs_unlink(struct inode
*, struct dentry
*);
48 static int nfs_symlink(struct inode
*, struct dentry
*, const char *);
49 static int nfs_link(struct dentry
*, struct inode
*, struct dentry
*);
50 static int nfs_mknod(struct inode
*, struct dentry
*, int, dev_t
);
51 static int nfs_rename(struct inode
*, struct dentry
*,
52 struct inode
*, struct dentry
*);
53 static int nfs_fsync_dir(struct file
*, struct dentry
*, int);
54 static loff_t
nfs_llseek_dir(struct file
*, loff_t
, int);
56 struct file_operations nfs_dir_operations
= {
57 .llseek
= nfs_llseek_dir
,
58 .read
= generic_read_dir
,
59 .readdir
= nfs_readdir
,
61 .release
= nfs_release
,
62 .fsync
= nfs_fsync_dir
,
65 struct inode_operations nfs_dir_inode_operations
= {
70 .symlink
= nfs_symlink
,
75 .permission
= nfs_permission
,
76 .getattr
= nfs_getattr
,
77 .setattr
= nfs_setattr
,
81 struct inode_operations nfs3_dir_inode_operations
= {
86 .symlink
= nfs_symlink
,
91 .permission
= nfs_permission
,
92 .getattr
= nfs_getattr
,
93 .setattr
= nfs_setattr
,
94 .listxattr
= nfs3_listxattr
,
95 .getxattr
= nfs3_getxattr
,
96 .setxattr
= nfs3_setxattr
,
97 .removexattr
= nfs3_removexattr
,
99 #endif /* CONFIG_NFS_V3 */
103 static struct dentry
*nfs_atomic_lookup(struct inode
*, struct dentry
*, struct nameidata
*);
104 struct inode_operations nfs4_dir_inode_operations
= {
105 .create
= nfs_create
,
106 .lookup
= nfs_atomic_lookup
,
108 .unlink
= nfs_unlink
,
109 .symlink
= nfs_symlink
,
113 .rename
= nfs_rename
,
114 .permission
= nfs_permission
,
115 .getattr
= nfs_getattr
,
116 .setattr
= nfs_setattr
,
117 .getxattr
= nfs4_getxattr
,
118 .setxattr
= nfs4_setxattr
,
119 .listxattr
= nfs4_listxattr
,
122 #endif /* CONFIG_NFS_V4 */
128 nfs_opendir(struct inode
*inode
, struct file
*filp
)
133 /* Call generic open code in order to cache credentials */
135 res
= nfs_open(inode
, filp
);
140 typedef u32
* (*decode_dirent_t
)(u32
*, struct nfs_entry
*, int);
144 unsigned long page_index
;
147 loff_t current_index
;
148 struct nfs_entry
*entry
;
149 decode_dirent_t decode
;
152 } nfs_readdir_descriptor_t
;
154 /* Now we cache directories properly, by stuffing the dirent
155 * data directly in the page cache.
157 * Inode invalidation due to refresh etc. takes care of
158 * _everything_, no sloppy entry flushing logic, no extraneous
159 * copying, network direct to page cache, the way it was meant
162 * NOTE: Dirent information verification is done always by the
163 * page-in of the RPC reply, nowhere else, this simplies
164 * things substantially.
167 int nfs_readdir_filler(nfs_readdir_descriptor_t
*desc
, struct page
*page
)
169 struct file
*file
= desc
->file
;
170 struct inode
*inode
= file
->f_dentry
->d_inode
;
171 struct rpc_cred
*cred
= nfs_file_cred(file
);
172 unsigned long timestamp
;
175 dfprintk(VFS
, "NFS: nfs_readdir_filler() reading cookie %Lu into page %lu.\n", (long long)desc
->entry
->cookie
, page
->index
);
179 error
= NFS_PROTO(inode
)->readdir(file
->f_dentry
, cred
, desc
->entry
->cookie
, page
,
180 NFS_SERVER(inode
)->dtsize
, desc
->plus
);
182 /* We requested READDIRPLUS, but the server doesn't grok it */
183 if (error
== -ENOTSUPP
&& desc
->plus
) {
184 NFS_SERVER(inode
)->caps
&= ~NFS_CAP_READDIRPLUS
;
185 clear_bit(NFS_INO_ADVISE_RDPLUS
, &NFS_FLAGS(inode
));
191 SetPageUptodate(page
);
192 spin_lock(&inode
->i_lock
);
193 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ATIME
;
194 spin_unlock(&inode
->i_lock
);
195 /* Ensure consistent page alignment of the data.
196 * Note: assumes we have exclusive access to this mapping either
197 * through inode->i_sem or some other mechanism.
199 if (page
->index
== 0)
200 invalidate_inode_pages2_range(inode
->i_mapping
, PAGE_CACHE_SIZE
, -1);
206 nfs_zap_caches(inode
);
212 int dir_decode(nfs_readdir_descriptor_t
*desc
)
215 p
= desc
->decode(p
, desc
->entry
, desc
->plus
);
223 void dir_page_release(nfs_readdir_descriptor_t
*desc
)
226 page_cache_release(desc
->page
);
232 * Given a pointer to a buffer that has already been filled by a call
233 * to readdir, find the next entry with cookie '*desc->dir_cookie'.
235 * If the end of the buffer has been reached, return -EAGAIN, if not,
236 * return the offset within the buffer of the next entry to be
240 int find_dirent(nfs_readdir_descriptor_t
*desc
)
242 struct nfs_entry
*entry
= desc
->entry
;
246 while((status
= dir_decode(desc
)) == 0) {
247 dfprintk(VFS
, "NFS: found cookie %Lu\n", (unsigned long long)entry
->cookie
);
248 if (entry
->prev_cookie
== *desc
->dir_cookie
)
250 if (loop_count
++ > 200) {
255 dfprintk(VFS
, "NFS: find_dirent() returns %d\n", status
);
260 * Given a pointer to a buffer that has already been filled by a call
261 * to readdir, find the entry at offset 'desc->file->f_pos'.
263 * If the end of the buffer has been reached, return -EAGAIN, if not,
264 * return the offset within the buffer of the next entry to be
268 int find_dirent_index(nfs_readdir_descriptor_t
*desc
)
270 struct nfs_entry
*entry
= desc
->entry
;
275 status
= dir_decode(desc
);
279 dfprintk(VFS
, "NFS: found cookie %Lu at index %Ld\n", (unsigned long long)entry
->cookie
, desc
->current_index
);
281 if (desc
->file
->f_pos
== desc
->current_index
) {
282 *desc
->dir_cookie
= entry
->cookie
;
285 desc
->current_index
++;
286 if (loop_count
++ > 200) {
291 dfprintk(VFS
, "NFS: find_dirent_index() returns %d\n", status
);
296 * Find the given page, and call find_dirent() or find_dirent_index in
297 * order to try to return the next entry.
300 int find_dirent_page(nfs_readdir_descriptor_t
*desc
)
302 struct inode
*inode
= desc
->file
->f_dentry
->d_inode
;
306 dfprintk(VFS
, "NFS: find_dirent_page() searching directory page %ld\n", desc
->page_index
);
308 page
= read_cache_page(inode
->i_mapping
, desc
->page_index
,
309 (filler_t
*)nfs_readdir_filler
, desc
);
311 status
= PTR_ERR(page
);
314 if (!PageUptodate(page
))
317 /* NOTE: Someone else may have changed the READDIRPLUS flag */
319 desc
->ptr
= kmap(page
); /* matching kunmap in nfs_do_filldir */
320 if (*desc
->dir_cookie
!= 0)
321 status
= find_dirent(desc
);
323 status
= find_dirent_index(desc
);
325 dir_page_release(desc
);
327 dfprintk(VFS
, "NFS: find_dirent_page() returns %d\n", status
);
330 page_cache_release(page
);
335 * Recurse through the page cache pages, and return a
336 * filled nfs_entry structure of the next directory entry if possible.
338 * The target for the search is '*desc->dir_cookie' if non-0,
339 * 'desc->file->f_pos' otherwise
342 int readdir_search_pagecache(nfs_readdir_descriptor_t
*desc
)
347 /* Always search-by-index from the beginning of the cache */
348 if (*desc
->dir_cookie
== 0) {
349 dfprintk(VFS
, "NFS: readdir_search_pagecache() searching for offset %Ld\n", (long long)desc
->file
->f_pos
);
350 desc
->page_index
= 0;
351 desc
->entry
->cookie
= desc
->entry
->prev_cookie
= 0;
352 desc
->entry
->eof
= 0;
353 desc
->current_index
= 0;
355 dfprintk(VFS
, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", (unsigned long long)*desc
->dir_cookie
);
358 res
= find_dirent_page(desc
);
361 /* Align to beginning of next page */
363 if (loop_count
++ > 200) {
368 dfprintk(VFS
, "NFS: readdir_search_pagecache() returned %d\n", res
);
372 static inline unsigned int dt_type(struct inode
*inode
)
374 return (inode
->i_mode
>> 12) & 15;
377 static struct dentry
*nfs_readdir_lookup(nfs_readdir_descriptor_t
*desc
);
380 * Once we've found the start of the dirent within a page: fill 'er up...
383 int nfs_do_filldir(nfs_readdir_descriptor_t
*desc
, void *dirent
,
386 struct file
*file
= desc
->file
;
387 struct nfs_entry
*entry
= desc
->entry
;
388 struct dentry
*dentry
= NULL
;
389 unsigned long fileid
;
393 dfprintk(VFS
, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", (long long)entry
->cookie
);
396 unsigned d_type
= DT_UNKNOWN
;
397 /* Note: entry->prev_cookie contains the cookie for
398 * retrieving the current dirent on the server */
399 fileid
= nfs_fileid_to_ino_t(entry
->ino
);
401 /* Get a dentry if we have one */
404 dentry
= nfs_readdir_lookup(desc
);
406 /* Use readdirplus info */
407 if (dentry
!= NULL
&& dentry
->d_inode
!= NULL
) {
408 d_type
= dt_type(dentry
->d_inode
);
409 fileid
= dentry
->d_inode
->i_ino
;
412 res
= filldir(dirent
, entry
->name
, entry
->len
,
413 file
->f_pos
, fileid
, d_type
);
417 *desc
->dir_cookie
= entry
->cookie
;
418 if (dir_decode(desc
) != 0) {
422 if (loop_count
++ > 200) {
427 dir_page_release(desc
);
430 dfprintk(VFS
, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", (unsigned long long)*desc
->dir_cookie
, res
);
435 * If we cannot find a cookie in our cache, we suspect that this is
436 * because it points to a deleted file, so we ask the server to return
437 * whatever it thinks is the next entry. We then feed this to filldir.
438 * If all goes well, we should then be able to find our way round the
439 * cache on the next call to readdir_search_pagecache();
441 * NOTE: we cannot add the anonymous page to the pagecache because
442 * the data it contains might not be page aligned. Besides,
443 * we should already have a complete representation of the
444 * directory in the page cache by the time we get here.
447 int uncached_readdir(nfs_readdir_descriptor_t
*desc
, void *dirent
,
450 struct file
*file
= desc
->file
;
451 struct inode
*inode
= file
->f_dentry
->d_inode
;
452 struct rpc_cred
*cred
= nfs_file_cred(file
);
453 struct page
*page
= NULL
;
456 dfprintk(VFS
, "NFS: uncached_readdir() searching for cookie %Lu\n", (unsigned long long)*desc
->dir_cookie
);
458 page
= alloc_page(GFP_HIGHUSER
);
463 desc
->error
= NFS_PROTO(inode
)->readdir(file
->f_dentry
, cred
, *desc
->dir_cookie
,
465 NFS_SERVER(inode
)->dtsize
,
467 spin_lock(&inode
->i_lock
);
468 NFS_I(inode
)->cache_validity
|= NFS_INO_INVALID_ATIME
;
469 spin_unlock(&inode
->i_lock
);
471 desc
->ptr
= kmap(page
); /* matching kunmap in nfs_do_filldir */
472 if (desc
->error
>= 0) {
473 if ((status
= dir_decode(desc
)) == 0)
474 desc
->entry
->prev_cookie
= *desc
->dir_cookie
;
480 status
= nfs_do_filldir(desc
, dirent
, filldir
);
482 /* Reset read descriptor so it searches the page cache from
483 * the start upon the next call to readdir_search_pagecache() */
484 desc
->page_index
= 0;
485 desc
->entry
->cookie
= desc
->entry
->prev_cookie
= 0;
486 desc
->entry
->eof
= 0;
488 dfprintk(VFS
, "NFS: uncached_readdir() returns %d\n", status
);
491 dir_page_release(desc
);
495 /* The file offset position represents the dirent entry number. A
496 last cookie cache takes care of the common case of reading the
499 static int nfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
501 struct dentry
*dentry
= filp
->f_dentry
;
502 struct inode
*inode
= dentry
->d_inode
;
503 nfs_readdir_descriptor_t my_desc
,
505 struct nfs_entry my_entry
;
507 struct nfs_fattr fattr
;
512 res
= nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
519 * filp->f_pos points to the dirent entry number.
520 * *desc->dir_cookie has the cookie for the next entry. We have
521 * to either find the entry with the appropriate number or
522 * revalidate the cookie.
524 memset(desc
, 0, sizeof(*desc
));
527 desc
->dir_cookie
= &((struct nfs_open_context
*)filp
->private_data
)->dir_cookie
;
528 desc
->decode
= NFS_PROTO(inode
)->decode_dirent
;
529 desc
->plus
= NFS_USE_READDIRPLUS(inode
);
531 my_entry
.cookie
= my_entry
.prev_cookie
= 0;
534 my_entry
.fattr
= &fattr
;
535 nfs_fattr_init(&fattr
);
536 desc
->entry
= &my_entry
;
538 while(!desc
->entry
->eof
) {
539 res
= readdir_search_pagecache(desc
);
541 if (res
== -EBADCOOKIE
) {
542 /* This means either end of directory */
543 if (*desc
->dir_cookie
&& desc
->entry
->cookie
!= *desc
->dir_cookie
) {
544 /* Or that the server has 'lost' a cookie */
545 res
= uncached_readdir(desc
, dirent
, filldir
);
552 if (res
== -ETOOSMALL
&& desc
->plus
) {
553 clear_bit(NFS_INO_ADVISE_RDPLUS
, &NFS_FLAGS(inode
));
554 nfs_zap_caches(inode
);
556 desc
->entry
->eof
= 0;
562 res
= nfs_do_filldir(desc
, dirent
, filldir
);
574 loff_t
nfs_llseek_dir(struct file
*filp
, loff_t offset
, int origin
)
576 down(&filp
->f_dentry
->d_inode
->i_sem
);
579 offset
+= filp
->f_pos
;
587 if (offset
!= filp
->f_pos
) {
588 filp
->f_pos
= offset
;
589 ((struct nfs_open_context
*)filp
->private_data
)->dir_cookie
= 0;
592 up(&filp
->f_dentry
->d_inode
->i_sem
);
597 * All directory operations under NFS are synchronous, so fsync()
598 * is a dummy operation.
600 int nfs_fsync_dir(struct file
*filp
, struct dentry
*dentry
, int datasync
)
606 * A check for whether or not the parent directory has changed.
607 * In the case it has, we assume that the dentries are untrustworthy
608 * and may need to be looked up again.
610 static inline int nfs_check_verifier(struct inode
*dir
, struct dentry
*dentry
)
614 if ((NFS_I(dir
)->cache_validity
& NFS_INO_INVALID_ATTR
) != 0
615 || nfs_attribute_timeout(dir
))
617 return nfs_verify_change_attribute(dir
, (unsigned long)dentry
->d_fsdata
);
620 static inline void nfs_set_verifier(struct dentry
* dentry
, unsigned long verf
)
622 dentry
->d_fsdata
= (void *)verf
;
626 * Whenever an NFS operation succeeds, we know that the dentry
627 * is valid, so we update the revalidation timestamp.
629 static inline void nfs_renew_times(struct dentry
* dentry
)
631 dentry
->d_time
= jiffies
;
635 * Return the intent data that applies to this particular path component
637 * Note that the current set of intents only apply to the very last
638 * component of the path.
639 * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT.
641 static inline unsigned int nfs_lookup_check_intent(struct nameidata
*nd
, unsigned int mask
)
643 if (nd
->flags
& (LOOKUP_CONTINUE
|LOOKUP_PARENT
))
645 return nd
->flags
& mask
;
649 * Inode and filehandle revalidation for lookups.
651 * We force revalidation in the cases where the VFS sets LOOKUP_REVAL,
652 * or if the intent information indicates that we're about to open this
653 * particular file and the "nocto" mount flag is not set.
657 int nfs_lookup_verify_inode(struct inode
*inode
, struct nameidata
*nd
)
659 struct nfs_server
*server
= NFS_SERVER(inode
);
662 /* VFS wants an on-the-wire revalidation */
663 if (nd
->flags
& LOOKUP_REVAL
)
665 /* This is an open(2) */
666 if (nfs_lookup_check_intent(nd
, LOOKUP_OPEN
) != 0 &&
667 !(server
->flags
& NFS_MOUNT_NOCTO
))
670 return nfs_revalidate_inode(server
, inode
);
672 return __nfs_revalidate_inode(server
, inode
);
676 * We judge how long we want to trust negative
677 * dentries by looking at the parent inode mtime.
679 * If parent mtime has changed, we revalidate, else we wait for a
680 * period corresponding to the parent's attribute cache timeout value.
683 int nfs_neg_need_reval(struct inode
*dir
, struct dentry
*dentry
,
684 struct nameidata
*nd
)
686 /* Don't revalidate a negative dentry if we're creating a new file */
687 if (nd
!= NULL
&& nfs_lookup_check_intent(nd
, LOOKUP_CREATE
) != 0)
689 return !nfs_check_verifier(dir
, dentry
);
693 * This is called every time the dcache has a lookup hit,
694 * and we should check whether we can really trust that
697 * NOTE! The hit can be a negative hit too, don't assume
700 * If the parent directory is seen to have changed, we throw out the
701 * cached dentry and do a new lookup.
703 static int nfs_lookup_revalidate(struct dentry
* dentry
, struct nameidata
*nd
)
707 struct dentry
*parent
;
709 struct nfs_fh fhandle
;
710 struct nfs_fattr fattr
;
711 unsigned long verifier
;
713 parent
= dget_parent(dentry
);
715 dir
= parent
->d_inode
;
716 inode
= dentry
->d_inode
;
719 if (nfs_neg_need_reval(dir
, dentry
, nd
))
724 if (is_bad_inode(inode
)) {
725 dfprintk(VFS
, "nfs_lookup_validate: %s/%s has dud inode\n",
726 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
730 /* Revalidate parent directory attribute cache */
731 if (nfs_revalidate_inode(NFS_SERVER(dir
), dir
) < 0)
734 /* Force a full look up iff the parent directory has changed */
735 if (nfs_check_verifier(dir
, dentry
)) {
736 if (nfs_lookup_verify_inode(inode
, nd
))
741 if (NFS_STALE(inode
))
744 verifier
= nfs_save_change_attribute(dir
);
745 error
= NFS_PROTO(dir
)->lookup(dir
, &dentry
->d_name
, &fhandle
, &fattr
);
748 if (nfs_compare_fh(NFS_FH(inode
), &fhandle
))
750 if ((error
= nfs_refresh_inode(inode
, &fattr
)) != 0)
753 nfs_renew_times(dentry
);
754 nfs_set_verifier(dentry
, verifier
);
763 if (inode
&& S_ISDIR(inode
->i_mode
)) {
764 /* Purge readdir caches. */
765 nfs_zap_caches(inode
);
766 /* If we have submounts, don't unhash ! */
767 if (have_submounts(dentry
))
769 shrink_dcache_parent(dentry
);
778 * This is called from dput() when d_count is going to 0.
780 static int nfs_dentry_delete(struct dentry
*dentry
)
782 dfprintk(VFS
, "NFS: dentry_delete(%s/%s, %x)\n",
783 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
786 if (dentry
->d_flags
& DCACHE_NFSFS_RENAMED
) {
787 /* Unhash it, so that ->d_iput() would be called */
790 if (!(dentry
->d_sb
->s_flags
& MS_ACTIVE
)) {
791 /* Unhash it, so that ancestors of killed async unlink
792 * files will be cleaned up during umount */
800 * Called when the dentry loses inode.
801 * We use it to clean up silly-renamed files.
803 static void nfs_dentry_iput(struct dentry
*dentry
, struct inode
*inode
)
805 nfs_inode_return_delegation(inode
);
806 if (dentry
->d_flags
& DCACHE_NFSFS_RENAMED
) {
809 nfs_complete_unlink(dentry
);
812 /* When creating a negative dentry, we want to renew d_time */
813 nfs_renew_times(dentry
);
817 struct dentry_operations nfs_dentry_operations
= {
818 .d_revalidate
= nfs_lookup_revalidate
,
819 .d_delete
= nfs_dentry_delete
,
820 .d_iput
= nfs_dentry_iput
,
824 * Use intent information to check whether or not we're going to do
825 * an O_EXCL create using this path component.
828 int nfs_is_exclusive_create(struct inode
*dir
, struct nameidata
*nd
)
830 if (NFS_PROTO(dir
)->version
== 2)
832 if (nd
== NULL
|| nfs_lookup_check_intent(nd
, LOOKUP_CREATE
) == 0)
834 return (nd
->intent
.open
.flags
& O_EXCL
) != 0;
837 static struct dentry
*nfs_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
840 struct inode
*inode
= NULL
;
842 struct nfs_fh fhandle
;
843 struct nfs_fattr fattr
;
845 dfprintk(VFS
, "NFS: lookup(%s/%s)\n",
846 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
848 res
= ERR_PTR(-ENAMETOOLONG
);
849 if (dentry
->d_name
.len
> NFS_SERVER(dir
)->namelen
)
852 res
= ERR_PTR(-ENOMEM
);
853 dentry
->d_op
= NFS_PROTO(dir
)->dentry_ops
;
856 /* Revalidate parent directory attribute cache */
857 error
= nfs_revalidate_inode(NFS_SERVER(dir
), dir
);
859 res
= ERR_PTR(error
);
863 /* If we're doing an exclusive create, optimize away the lookup */
864 if (nfs_is_exclusive_create(dir
, nd
))
867 error
= NFS_PROTO(dir
)->lookup(dir
, &dentry
->d_name
, &fhandle
, &fattr
);
868 if (error
== -ENOENT
)
871 res
= ERR_PTR(error
);
874 res
= ERR_PTR(-EACCES
);
875 inode
= nfs_fhget(dentry
->d_sb
, &fhandle
, &fattr
);
879 res
= d_add_unique(dentry
, inode
);
882 nfs_renew_times(dentry
);
883 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
891 static int nfs_open_revalidate(struct dentry
*, struct nameidata
*);
893 struct dentry_operations nfs4_dentry_operations
= {
894 .d_revalidate
= nfs_open_revalidate
,
895 .d_delete
= nfs_dentry_delete
,
896 .d_iput
= nfs_dentry_iput
,
900 * Use intent information to determine whether we need to substitute
901 * the NFSv4-style stateful OPEN for the LOOKUP call
903 static int is_atomic_open(struct inode
*dir
, struct nameidata
*nd
)
905 if (nd
== NULL
|| nfs_lookup_check_intent(nd
, LOOKUP_OPEN
) == 0)
907 /* NFS does not (yet) have a stateful open for directories */
908 if (nd
->flags
& LOOKUP_DIRECTORY
)
910 /* Are we trying to write to a read only partition? */
911 if (IS_RDONLY(dir
) && (nd
->intent
.open
.flags
& (O_CREAT
|O_TRUNC
|FMODE_WRITE
)))
916 static struct dentry
*nfs_atomic_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
)
918 struct dentry
*res
= NULL
;
921 /* Check that we are indeed trying to open this file */
922 if (!is_atomic_open(dir
, nd
))
925 if (dentry
->d_name
.len
> NFS_SERVER(dir
)->namelen
) {
926 res
= ERR_PTR(-ENAMETOOLONG
);
929 dentry
->d_op
= NFS_PROTO(dir
)->dentry_ops
;
931 /* Let vfs_create() deal with O_EXCL */
932 if (nd
->intent
.open
.flags
& O_EXCL
) {
937 /* Open the file on the server */
939 /* Revalidate parent directory attribute cache */
940 error
= nfs_revalidate_inode(NFS_SERVER(dir
), dir
);
942 res
= ERR_PTR(error
);
947 if (nd
->intent
.open
.flags
& O_CREAT
) {
948 nfs_begin_data_update(dir
);
949 res
= nfs4_atomic_open(dir
, dentry
, nd
);
950 nfs_end_data_update(dir
);
952 res
= nfs4_atomic_open(dir
, dentry
, nd
);
955 error
= PTR_ERR(res
);
957 /* Make a negative dentry */
961 /* This turned out not to be a regular file */
966 if (!(nd
->intent
.open
.flags
& O_NOFOLLOW
))
972 } else if (res
!= NULL
)
974 nfs_renew_times(dentry
);
975 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
979 return nfs_lookup(dir
, dentry
, nd
);
982 static int nfs_open_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
984 struct dentry
*parent
= NULL
;
985 struct inode
*inode
= dentry
->d_inode
;
987 unsigned long verifier
;
988 int openflags
, ret
= 0;
990 parent
= dget_parent(dentry
);
991 dir
= parent
->d_inode
;
992 if (!is_atomic_open(dir
, nd
))
994 /* We can't create new files in nfs_open_revalidate(), so we
995 * optimize away revalidation of negative dentries.
999 /* NFS only supports OPEN on regular files */
1000 if (!S_ISREG(inode
->i_mode
))
1002 openflags
= nd
->intent
.open
.flags
;
1003 /* We cannot do exclusive creation on a positive dentry */
1004 if ((openflags
& (O_CREAT
|O_EXCL
)) == (O_CREAT
|O_EXCL
))
1006 /* We can't create new files, or truncate existing ones here */
1007 openflags
&= ~(O_CREAT
|O_TRUNC
);
1010 * Note: we're not holding inode->i_sem and so may be racing with
1011 * operations that change the directory. We therefore save the
1012 * change attribute *before* we do the RPC call.
1015 verifier
= nfs_save_change_attribute(dir
);
1016 ret
= nfs4_open_revalidate(dir
, dentry
, openflags
, nd
);
1018 nfs_set_verifier(dentry
, verifier
);
1027 if (inode
!= NULL
&& nfs_have_delegation(inode
, FMODE_READ
))
1029 return nfs_lookup_revalidate(dentry
, nd
);
1031 #endif /* CONFIG_NFSV4 */
1033 static struct dentry
*nfs_readdir_lookup(nfs_readdir_descriptor_t
*desc
)
1035 struct dentry
*parent
= desc
->file
->f_dentry
;
1036 struct inode
*dir
= parent
->d_inode
;
1037 struct nfs_entry
*entry
= desc
->entry
;
1038 struct dentry
*dentry
, *alias
;
1039 struct qstr name
= {
1040 .name
= entry
->name
,
1043 struct inode
*inode
;
1047 if (name
.name
[0] == '.' && name
.name
[1] == '.')
1048 return dget_parent(parent
);
1051 if (name
.name
[0] == '.')
1052 return dget(parent
);
1054 name
.hash
= full_name_hash(name
.name
, name
.len
);
1055 dentry
= d_lookup(parent
, &name
);
1058 if (!desc
->plus
|| !(entry
->fattr
->valid
& NFS_ATTR_FATTR
))
1060 /* Note: caller is already holding the dir->i_sem! */
1061 dentry
= d_alloc(parent
, &name
);
1064 dentry
->d_op
= NFS_PROTO(dir
)->dentry_ops
;
1065 inode
= nfs_fhget(dentry
->d_sb
, entry
->fh
, entry
->fattr
);
1070 alias
= d_add_unique(dentry
, inode
);
1071 if (alias
!= NULL
) {
1075 nfs_renew_times(dentry
);
1076 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
1081 * Code common to create, mkdir, and mknod.
1083 int nfs_instantiate(struct dentry
*dentry
, struct nfs_fh
*fhandle
,
1084 struct nfs_fattr
*fattr
)
1086 struct inode
*inode
;
1087 int error
= -EACCES
;
1089 /* We may have been initialized further down */
1090 if (dentry
->d_inode
)
1092 if (fhandle
->size
== 0) {
1093 struct inode
*dir
= dentry
->d_parent
->d_inode
;
1094 error
= NFS_PROTO(dir
)->lookup(dir
, &dentry
->d_name
, fhandle
, fattr
);
1098 if (!(fattr
->valid
& NFS_ATTR_FATTR
)) {
1099 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
1100 error
= server
->rpc_ops
->getattr(server
, fhandle
, fattr
);
1105 inode
= nfs_fhget(dentry
->d_sb
, fhandle
, fattr
);
1108 d_instantiate(dentry
, inode
);
1116 * Following a failed create operation, we drop the dentry rather
1117 * than retain a negative dentry. This avoids a problem in the event
1118 * that the operation succeeded on the server, but an error in the
1119 * reply path made it appear to have failed.
1121 static int nfs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
1122 struct nameidata
*nd
)
1128 dfprintk(VFS
, "NFS: create(%s/%ld, %s\n", dir
->i_sb
->s_id
,
1129 dir
->i_ino
, dentry
->d_name
.name
);
1131 attr
.ia_mode
= mode
;
1132 attr
.ia_valid
= ATTR_MODE
;
1134 if (nd
&& (nd
->flags
& LOOKUP_CREATE
))
1135 open_flags
= nd
->intent
.open
.flags
;
1138 nfs_begin_data_update(dir
);
1139 error
= NFS_PROTO(dir
)->create(dir
, dentry
, &attr
, open_flags
, nd
);
1140 nfs_end_data_update(dir
);
1143 nfs_renew_times(dentry
);
1144 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
1154 * See comments for nfs_proc_create regarding failed operations.
1157 nfs_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t rdev
)
1162 dfprintk(VFS
, "NFS: mknod(%s/%ld, %s\n", dir
->i_sb
->s_id
,
1163 dir
->i_ino
, dentry
->d_name
.name
);
1165 if (!new_valid_dev(rdev
))
1168 attr
.ia_mode
= mode
;
1169 attr
.ia_valid
= ATTR_MODE
;
1172 nfs_begin_data_update(dir
);
1173 status
= NFS_PROTO(dir
)->mknod(dir
, dentry
, &attr
, rdev
);
1174 nfs_end_data_update(dir
);
1177 nfs_renew_times(dentry
);
1178 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
1188 * See comments for nfs_proc_create regarding failed operations.
1190 static int nfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1195 dfprintk(VFS
, "NFS: mkdir(%s/%ld, %s\n", dir
->i_sb
->s_id
,
1196 dir
->i_ino
, dentry
->d_name
.name
);
1198 attr
.ia_valid
= ATTR_MODE
;
1199 attr
.ia_mode
= mode
| S_IFDIR
;
1202 nfs_begin_data_update(dir
);
1203 error
= NFS_PROTO(dir
)->mkdir(dir
, dentry
, &attr
);
1204 nfs_end_data_update(dir
);
1207 nfs_renew_times(dentry
);
1208 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
1217 static int nfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1221 dfprintk(VFS
, "NFS: rmdir(%s/%ld, %s\n", dir
->i_sb
->s_id
,
1222 dir
->i_ino
, dentry
->d_name
.name
);
1225 nfs_begin_data_update(dir
);
1226 error
= NFS_PROTO(dir
)->rmdir(dir
, &dentry
->d_name
);
1227 /* Ensure the VFS deletes this inode */
1228 if (error
== 0 && dentry
->d_inode
!= NULL
)
1229 dentry
->d_inode
->i_nlink
= 0;
1230 nfs_end_data_update(dir
);
1236 static int nfs_sillyrename(struct inode
*dir
, struct dentry
*dentry
)
1238 static unsigned int sillycounter
;
1239 const int i_inosize
= sizeof(dir
->i_ino
)*2;
1240 const int countersize
= sizeof(sillycounter
)*2;
1241 const int slen
= sizeof(".nfs") + i_inosize
+ countersize
- 1;
1244 struct dentry
*sdentry
;
1247 dfprintk(VFS
, "NFS: silly-rename(%s/%s, ct=%d)\n",
1248 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
1249 atomic_read(&dentry
->d_count
));
1252 if (!dentry
->d_inode
)
1253 printk("NFS: silly-renaming %s/%s, negative dentry??\n",
1254 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
1257 * We don't allow a dentry to be silly-renamed twice.
1260 if (dentry
->d_flags
& DCACHE_NFSFS_RENAMED
)
1263 sprintf(silly
, ".nfs%*.*lx",
1264 i_inosize
, i_inosize
, dentry
->d_inode
->i_ino
);
1268 char *suffix
= silly
+ slen
- countersize
;
1272 sprintf(suffix
, "%*.*x", countersize
, countersize
, sillycounter
);
1274 dfprintk(VFS
, "trying to rename %s to %s\n",
1275 dentry
->d_name
.name
, silly
);
1277 sdentry
= lookup_one_len(silly
, dentry
->d_parent
, slen
);
1279 * N.B. Better to return EBUSY here ... it could be
1280 * dangerous to delete the file while it's in use.
1282 if (IS_ERR(sdentry
))
1284 } while(sdentry
->d_inode
!= NULL
); /* need negative lookup */
1286 qsilly
.name
= silly
;
1287 qsilly
.len
= strlen(silly
);
1288 nfs_begin_data_update(dir
);
1289 if (dentry
->d_inode
) {
1290 nfs_begin_data_update(dentry
->d_inode
);
1291 error
= NFS_PROTO(dir
)->rename(dir
, &dentry
->d_name
,
1293 nfs_end_data_update(dentry
->d_inode
);
1295 error
= NFS_PROTO(dir
)->rename(dir
, &dentry
->d_name
,
1297 nfs_end_data_update(dir
);
1299 nfs_renew_times(dentry
);
1300 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
1301 d_move(dentry
, sdentry
);
1302 error
= nfs_async_unlink(dentry
);
1303 /* If we return 0 we don't unlink */
1311 * Remove a file after making sure there are no pending writes,
1312 * and after checking that the file has only one user.
1314 * We invalidate the attribute cache and free the inode prior to the operation
1315 * to avoid possible races if the server reuses the inode.
1317 static int nfs_safe_remove(struct dentry
*dentry
)
1319 struct inode
*dir
= dentry
->d_parent
->d_inode
;
1320 struct inode
*inode
= dentry
->d_inode
;
1323 dfprintk(VFS
, "NFS: safe_remove(%s/%s)\n",
1324 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
1326 /* If the dentry was sillyrenamed, we simply call d_delete() */
1327 if (dentry
->d_flags
& DCACHE_NFSFS_RENAMED
) {
1332 nfs_begin_data_update(dir
);
1333 if (inode
!= NULL
) {
1334 nfs_inode_return_delegation(inode
);
1335 nfs_begin_data_update(inode
);
1336 error
= NFS_PROTO(dir
)->remove(dir
, &dentry
->d_name
);
1337 /* The VFS may want to delete this inode */
1340 nfs_end_data_update(inode
);
1342 error
= NFS_PROTO(dir
)->remove(dir
, &dentry
->d_name
);
1343 nfs_end_data_update(dir
);
1348 /* We do silly rename. In case sillyrename() returns -EBUSY, the inode
1349 * belongs to an active ".nfs..." file and we return -EBUSY.
1351 * If sillyrename() returns 0, we do nothing, otherwise we unlink.
1353 static int nfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
1356 int need_rehash
= 0;
1358 dfprintk(VFS
, "NFS: unlink(%s/%ld, %s)\n", dir
->i_sb
->s_id
,
1359 dir
->i_ino
, dentry
->d_name
.name
);
1362 spin_lock(&dcache_lock
);
1363 spin_lock(&dentry
->d_lock
);
1364 if (atomic_read(&dentry
->d_count
) > 1) {
1365 spin_unlock(&dentry
->d_lock
);
1366 spin_unlock(&dcache_lock
);
1367 error
= nfs_sillyrename(dir
, dentry
);
1371 if (!d_unhashed(dentry
)) {
1375 spin_unlock(&dentry
->d_lock
);
1376 spin_unlock(&dcache_lock
);
1377 error
= nfs_safe_remove(dentry
);
1379 nfs_renew_times(dentry
);
1380 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
1381 } else if (need_rehash
)
1388 nfs_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *symname
)
1391 struct nfs_fattr sym_attr
;
1392 struct nfs_fh sym_fh
;
1393 struct qstr qsymname
;
1396 dfprintk(VFS
, "NFS: symlink(%s/%ld, %s, %s)\n", dir
->i_sb
->s_id
,
1397 dir
->i_ino
, dentry
->d_name
.name
, symname
);
1400 if (dentry
->d_inode
)
1401 printk("nfs_proc_symlink: %s/%s not negative!\n",
1402 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
1405 * Fill in the sattr for the call.
1406 * Note: SunOS 4.1.2 crashes if the mode isn't initialized!
1408 attr
.ia_valid
= ATTR_MODE
;
1409 attr
.ia_mode
= S_IFLNK
| S_IRWXUGO
;
1411 qsymname
.name
= symname
;
1412 qsymname
.len
= strlen(symname
);
1415 nfs_begin_data_update(dir
);
1416 error
= NFS_PROTO(dir
)->symlink(dir
, &dentry
->d_name
, &qsymname
,
1417 &attr
, &sym_fh
, &sym_attr
);
1418 nfs_end_data_update(dir
);
1420 error
= nfs_instantiate(dentry
, &sym_fh
, &sym_attr
);
1422 if (error
== -EEXIST
)
1423 printk("nfs_proc_symlink: %s/%s already exists??\n",
1424 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
1432 nfs_link(struct dentry
*old_dentry
, struct inode
*dir
, struct dentry
*dentry
)
1434 struct inode
*inode
= old_dentry
->d_inode
;
1437 dfprintk(VFS
, "NFS: link(%s/%s -> %s/%s)\n",
1438 old_dentry
->d_parent
->d_name
.name
, old_dentry
->d_name
.name
,
1439 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
1442 * Drop the dentry in advance to force a new lookup.
1443 * Since nfs_proc_link doesn't return a file handle,
1444 * we can't use the existing dentry.
1449 nfs_begin_data_update(dir
);
1450 nfs_begin_data_update(inode
);
1451 error
= NFS_PROTO(dir
)->link(inode
, dir
, &dentry
->d_name
);
1452 nfs_end_data_update(inode
);
1453 nfs_end_data_update(dir
);
1460 * FIXME: Some nfsds, like the Linux user space nfsd, may generate a
1461 * different file handle for the same inode after a rename (e.g. when
1462 * moving to a different directory). A fail-safe method to do so would
1463 * be to look up old_dir/old_name, create a link to new_dir/new_name and
1464 * rename the old file using the sillyrename stuff. This way, the original
1465 * file in old_dir will go away when the last process iput()s the inode.
1469 * It actually works quite well. One needs to have the possibility for
1470 * at least one ".nfs..." file in each directory the file ever gets
1471 * moved or linked to which happens automagically with the new
1472 * implementation that only depends on the dcache stuff instead of
1473 * using the inode layer
1475 * Unfortunately, things are a little more complicated than indicated
1476 * above. For a cross-directory move, we want to make sure we can get
1477 * rid of the old inode after the operation. This means there must be
1478 * no pending writes (if it's a file), and the use count must be 1.
1479 * If these conditions are met, we can drop the dentries before doing
1482 static int nfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
1483 struct inode
*new_dir
, struct dentry
*new_dentry
)
1485 struct inode
*old_inode
= old_dentry
->d_inode
;
1486 struct inode
*new_inode
= new_dentry
->d_inode
;
1487 struct dentry
*dentry
= NULL
, *rehash
= NULL
;
1491 * To prevent any new references to the target during the rename,
1492 * we unhash the dentry and free the inode in advance.
1495 if (!d_unhashed(new_dentry
)) {
1497 rehash
= new_dentry
;
1500 dfprintk(VFS
, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
1501 old_dentry
->d_parent
->d_name
.name
, old_dentry
->d_name
.name
,
1502 new_dentry
->d_parent
->d_name
.name
, new_dentry
->d_name
.name
,
1503 atomic_read(&new_dentry
->d_count
));
1506 * First check whether the target is busy ... we can't
1507 * safely do _any_ rename if the target is in use.
1509 * For files, make a copy of the dentry and then do a
1510 * silly-rename. If the silly-rename succeeds, the
1511 * copied dentry is hashed and becomes the new target.
1515 if (S_ISDIR(new_inode
->i_mode
)) {
1517 if (!S_ISDIR(old_inode
->i_mode
))
1519 } else if (atomic_read(&new_dentry
->d_count
) > 2) {
1521 /* copy the target dentry's name */
1522 dentry
= d_alloc(new_dentry
->d_parent
,
1523 &new_dentry
->d_name
);
1527 /* silly-rename the existing target ... */
1528 err
= nfs_sillyrename(new_dir
, new_dentry
);
1530 new_dentry
= rehash
= dentry
;
1532 /* instantiate the replacement target */
1533 d_instantiate(new_dentry
, NULL
);
1534 } else if (atomic_read(&new_dentry
->d_count
) > 1) {
1535 /* dentry still busy? */
1537 printk("nfs_rename: target %s/%s busy, d_count=%d\n",
1538 new_dentry
->d_parent
->d_name
.name
,
1539 new_dentry
->d_name
.name
,
1540 atomic_read(&new_dentry
->d_count
));
1545 new_inode
->i_nlink
--;
1549 * ... prune child dentries and writebacks if needed.
1551 if (atomic_read(&old_dentry
->d_count
) > 1) {
1552 nfs_wb_all(old_inode
);
1553 shrink_dcache_parent(old_dentry
);
1555 nfs_inode_return_delegation(old_inode
);
1558 d_delete(new_dentry
);
1560 nfs_begin_data_update(old_dir
);
1561 nfs_begin_data_update(new_dir
);
1562 nfs_begin_data_update(old_inode
);
1563 error
= NFS_PROTO(old_dir
)->rename(old_dir
, &old_dentry
->d_name
,
1564 new_dir
, &new_dentry
->d_name
);
1565 nfs_end_data_update(old_inode
);
1566 nfs_end_data_update(new_dir
);
1567 nfs_end_data_update(old_dir
);
1572 if (!S_ISDIR(old_inode
->i_mode
))
1573 d_move(old_dentry
, new_dentry
);
1574 nfs_renew_times(new_dentry
);
1575 nfs_set_verifier(new_dentry
, nfs_save_change_attribute(new_dir
));
1578 /* new dentry created? */
1585 int nfs_access_get_cached(struct inode
*inode
, struct rpc_cred
*cred
, struct nfs_access_entry
*res
)
1587 struct nfs_inode
*nfsi
= NFS_I(inode
);
1588 struct nfs_access_entry
*cache
= &nfsi
->cache_access
;
1590 if (cache
->cred
!= cred
1591 || time_after(jiffies
, cache
->jiffies
+ NFS_ATTRTIMEO(inode
))
1592 || (nfsi
->cache_validity
& NFS_INO_INVALID_ACCESS
))
1594 memcpy(res
, cache
, sizeof(*res
));
1598 void nfs_access_add_cache(struct inode
*inode
, struct nfs_access_entry
*set
)
1600 struct nfs_inode
*nfsi
= NFS_I(inode
);
1601 struct nfs_access_entry
*cache
= &nfsi
->cache_access
;
1603 if (cache
->cred
!= set
->cred
) {
1605 put_rpccred(cache
->cred
);
1606 cache
->cred
= get_rpccred(set
->cred
);
1608 /* FIXME: replace current access_cache BKL reliance with inode->i_lock */
1609 spin_lock(&inode
->i_lock
);
1610 nfsi
->cache_validity
&= ~NFS_INO_INVALID_ACCESS
;
1611 spin_unlock(&inode
->i_lock
);
1612 cache
->jiffies
= set
->jiffies
;
1613 cache
->mask
= set
->mask
;
1616 static int nfs_do_access(struct inode
*inode
, struct rpc_cred
*cred
, int mask
)
1618 struct nfs_access_entry cache
;
1621 status
= nfs_access_get_cached(inode
, cred
, &cache
);
1625 /* Be clever: ask server to check for all possible rights */
1626 cache
.mask
= MAY_EXEC
| MAY_WRITE
| MAY_READ
;
1628 cache
.jiffies
= jiffies
;
1629 status
= NFS_PROTO(inode
)->access(inode
, &cache
);
1632 nfs_access_add_cache(inode
, &cache
);
1634 if ((cache
.mask
& mask
) == mask
)
1639 int nfs_permission(struct inode
*inode
, int mask
, struct nameidata
*nd
)
1641 struct rpc_cred
*cred
;
1646 /* Is this sys_access() ? */
1647 if (nd
!= NULL
&& (nd
->flags
& LOOKUP_ACCESS
))
1650 switch (inode
->i_mode
& S_IFMT
) {
1654 /* NFSv4 has atomic_open... */
1655 if (nfs_server_capable(inode
, NFS_CAP_ATOMIC_OPEN
)
1657 && (nd
->flags
& LOOKUP_OPEN
))
1662 * Optimize away all write operations, since the server
1663 * will check permissions when we perform the op.
1665 if ((mask
& MAY_WRITE
) && !(mask
& MAY_READ
))
1672 if (!NFS_PROTO(inode
)->access
)
1675 cred
= rpcauth_lookupcred(NFS_CLIENT(inode
)->cl_auth
, 0);
1676 if (!IS_ERR(cred
)) {
1677 res
= nfs_do_access(inode
, cred
, mask
);
1680 res
= PTR_ERR(cred
);
1685 res
= nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
1687 res
= generic_permission(inode
, mask
, NULL
);
1694 * version-control: t
1695 * kept-new-versions: 5