1 /* dir.c: AFS filesystem directory handling
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
16 #include <linux/namei.h>
17 #include <linux/pagemap.h>
18 #include <linux/ctype.h>
19 #include <linux/sched.h>
22 static struct dentry
*afs_lookup(struct inode
*dir
, struct dentry
*dentry
,
23 struct nameidata
*nd
);
24 static int afs_dir_open(struct inode
*inode
, struct file
*file
);
25 static int afs_readdir(struct file
*file
, void *dirent
, filldir_t filldir
);
26 static int afs_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
);
27 static int afs_d_delete(const struct dentry
*dentry
);
28 static void afs_d_release(struct dentry
*dentry
);
29 static int afs_lookup_filldir(void *_cookie
, const char *name
, int nlen
,
30 loff_t fpos
, u64 ino
, unsigned dtype
);
31 static int afs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
32 struct nameidata
*nd
);
33 static int afs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
);
34 static int afs_rmdir(struct inode
*dir
, struct dentry
*dentry
);
35 static int afs_unlink(struct inode
*dir
, struct dentry
*dentry
);
36 static int afs_link(struct dentry
*from
, struct inode
*dir
,
37 struct dentry
*dentry
);
38 static int afs_symlink(struct inode
*dir
, struct dentry
*dentry
,
40 static int afs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
41 struct inode
*new_dir
, struct dentry
*new_dentry
);
43 const struct file_operations afs_dir_file_operations
= {
45 .release
= afs_release
,
46 .readdir
= afs_readdir
,
48 .llseek
= generic_file_llseek
,
51 const struct inode_operations afs_dir_inode_operations
= {
56 .symlink
= afs_symlink
,
60 .permission
= afs_permission
,
61 .getattr
= afs_getattr
,
62 .setattr
= afs_setattr
,
65 const struct dentry_operations afs_fs_dentry_operations
= {
66 .d_revalidate
= afs_d_revalidate
,
67 .d_delete
= afs_d_delete
,
68 .d_release
= afs_d_release
,
69 .d_automount
= afs_d_automount
,
72 #define AFS_DIR_HASHTBL_SIZE 128
73 #define AFS_DIR_DIRENT_SIZE 32
74 #define AFS_DIRENT_PER_BLOCK 64
84 uint8_t overflow
[4]; /* if any char of the name (inc
85 * NUL) reaches here, consume
86 * the next dirent too */
88 uint8_t extended_name
[32];
91 /* AFS directory page header (one at the beginning of every 2048-byte chunk) */
92 struct afs_dir_pagehdr
{
95 #define AFS_DIR_MAGIC htons(1234)
101 /* directory block layout */
102 union afs_dir_block
{
104 struct afs_dir_pagehdr pagehdr
;
107 struct afs_dir_pagehdr pagehdr
;
108 uint8_t alloc_ctrs
[128];
110 uint16_t hashtable
[AFS_DIR_HASHTBL_SIZE
];
113 union afs_dirent dirents
[AFS_DIRENT_PER_BLOCK
];
116 /* layout on a linux VM page */
117 struct afs_dir_page
{
118 union afs_dir_block blocks
[PAGE_SIZE
/ sizeof(union afs_dir_block
)];
121 struct afs_lookup_cookie
{
129 * check that a directory page is valid
131 static inline void afs_dir_check_page(struct inode
*dir
, struct page
*page
)
133 struct afs_dir_page
*dbuf
;
138 /* check the page count */
139 qty
= desc
.size
/ sizeof(dbuf
->blocks
[0]);
143 if (page
->index
== 0 && qty
!= ntohs(dbuf
->blocks
[0].pagehdr
.npages
)) {
144 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
145 __func__
, dir
->i_ino
, qty
,
146 ntohs(dbuf
->blocks
[0].pagehdr
.npages
));
151 /* determine how many magic numbers there should be in this page */
152 latter
= dir
->i_size
- page_offset(page
);
153 if (latter
>= PAGE_SIZE
)
157 qty
/= sizeof(union afs_dir_block
);
160 dbuf
= page_address(page
);
161 for (tmp
= 0; tmp
< qty
; tmp
++) {
162 if (dbuf
->blocks
[tmp
].pagehdr
.magic
!= AFS_DIR_MAGIC
) {
163 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
164 __func__
, dir
->i_ino
, tmp
, qty
,
165 ntohs(dbuf
->blocks
[tmp
].pagehdr
.magic
));
170 SetPageChecked(page
);
174 SetPageChecked(page
);
179 * discard a page cached in the pagecache
181 static inline void afs_dir_put_page(struct page
*page
)
184 page_cache_release(page
);
188 * get a page into the pagecache
190 static struct page
*afs_dir_get_page(struct inode
*dir
, unsigned long index
,
194 _enter("{%lu},%lu", dir
->i_ino
, index
);
196 page
= read_cache_page(dir
->i_mapping
, index
, afs_page_filler
, key
);
199 if (!PageChecked(page
))
200 afs_dir_check_page(dir
, page
);
207 afs_dir_put_page(page
);
209 return ERR_PTR(-EIO
);
213 * open an AFS directory file
215 static int afs_dir_open(struct inode
*inode
, struct file
*file
)
217 _enter("{%lu}", inode
->i_ino
);
219 BUILD_BUG_ON(sizeof(union afs_dir_block
) != 2048);
220 BUILD_BUG_ON(sizeof(union afs_dirent
) != 32);
222 if (test_bit(AFS_VNODE_DELETED
, &AFS_FS_I(inode
)->flags
))
225 return afs_open(inode
, file
);
229 * deal with one block in an AFS directory
231 static int afs_dir_iterate_block(unsigned *fpos
,
232 union afs_dir_block
*block
,
237 union afs_dirent
*dire
;
238 unsigned offset
, next
, curr
;
242 _enter("%u,%x,%p,,",*fpos
,blkoff
,block
);
244 curr
= (*fpos
- blkoff
) / sizeof(union afs_dirent
);
246 /* walk through the block, an entry at a time */
247 for (offset
= AFS_DIRENT_PER_BLOCK
- block
->pagehdr
.nentries
;
248 offset
< AFS_DIRENT_PER_BLOCK
;
253 /* skip entries marked unused in the bitmap */
254 if (!(block
->pagehdr
.bitmap
[offset
/ 8] &
255 (1 << (offset
% 8)))) {
256 _debug("ENT[%Zu.%u]: unused",
257 blkoff
/ sizeof(union afs_dir_block
), offset
);
260 next
* sizeof(union afs_dirent
);
264 /* got a valid entry */
265 dire
= &block
->dirents
[offset
];
266 nlen
= strnlen(dire
->u
.name
,
268 offset
* sizeof(union afs_dirent
));
270 _debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
271 blkoff
/ sizeof(union afs_dir_block
), offset
,
272 (offset
< curr
? "skip" : "fill"),
275 /* work out where the next possible entry is */
276 for (tmp
= nlen
; tmp
> 15; tmp
-= sizeof(union afs_dirent
)) {
277 if (next
>= AFS_DIRENT_PER_BLOCK
) {
278 _debug("ENT[%Zu.%u]:"
279 " %u travelled beyond end dir block"
281 blkoff
/ sizeof(union afs_dir_block
),
282 offset
, next
, tmp
, nlen
);
285 if (!(block
->pagehdr
.bitmap
[next
/ 8] &
286 (1 << (next
% 8)))) {
287 _debug("ENT[%Zu.%u]:"
288 " %u unmarked extension (len %u/%Zu)",
289 blkoff
/ sizeof(union afs_dir_block
),
290 offset
, next
, tmp
, nlen
);
294 _debug("ENT[%Zu.%u]: ext %u/%Zu",
295 blkoff
/ sizeof(union afs_dir_block
),
300 /* skip if starts before the current position */
304 /* found the next entry */
305 ret
= filldir(cookie
,
308 blkoff
+ offset
* sizeof(union afs_dirent
),
309 ntohl(dire
->u
.vnode
),
310 filldir
== afs_lookup_filldir
?
311 ntohl(dire
->u
.unique
) : DT_UNKNOWN
);
313 _leave(" = 0 [full]");
317 *fpos
= blkoff
+ next
* sizeof(union afs_dirent
);
320 _leave(" = 1 [more]");
325 * iterate through the data blob that lists the contents of an AFS directory
327 static int afs_dir_iterate(struct inode
*dir
, unsigned *fpos
, void *cookie
,
328 filldir_t filldir
, struct key
*key
)
330 union afs_dir_block
*dblock
;
331 struct afs_dir_page
*dbuf
;
333 unsigned blkoff
, limit
;
336 _enter("{%lu},%u,,", dir
->i_ino
, *fpos
);
338 if (test_bit(AFS_VNODE_DELETED
, &AFS_FS_I(dir
)->flags
)) {
339 _leave(" = -ESTALE");
343 /* round the file position up to the next entry boundary */
344 *fpos
+= sizeof(union afs_dirent
) - 1;
345 *fpos
&= ~(sizeof(union afs_dirent
) - 1);
347 /* walk through the blocks in sequence */
349 while (*fpos
< dir
->i_size
) {
350 blkoff
= *fpos
& ~(sizeof(union afs_dir_block
) - 1);
352 /* fetch the appropriate page from the directory */
353 page
= afs_dir_get_page(dir
, blkoff
/ PAGE_SIZE
, key
);
359 limit
= blkoff
& ~(PAGE_SIZE
- 1);
361 dbuf
= page_address(page
);
363 /* deal with the individual blocks stashed on this page */
365 dblock
= &dbuf
->blocks
[(blkoff
% PAGE_SIZE
) /
366 sizeof(union afs_dir_block
)];
367 ret
= afs_dir_iterate_block(fpos
, dblock
, blkoff
,
370 afs_dir_put_page(page
);
374 blkoff
+= sizeof(union afs_dir_block
);
376 } while (*fpos
< dir
->i_size
&& blkoff
< limit
);
378 afs_dir_put_page(page
);
383 _leave(" = %d", ret
);
388 * read an AFS directory
390 static int afs_readdir(struct file
*file
, void *cookie
, filldir_t filldir
)
395 _enter("{%Ld,{%lu}}",
396 file
->f_pos
, file
->f_path
.dentry
->d_inode
->i_ino
);
398 ASSERT(file
->private_data
!= NULL
);
401 ret
= afs_dir_iterate(file
->f_path
.dentry
->d_inode
, &fpos
,
402 cookie
, filldir
, file
->private_data
);
405 _leave(" = %d", ret
);
410 * search the directory for a name
411 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
412 * uniquifier through dtype
414 static int afs_lookup_filldir(void *_cookie
, const char *name
, int nlen
,
415 loff_t fpos
, u64 ino
, unsigned dtype
)
417 struct afs_lookup_cookie
*cookie
= _cookie
;
419 _enter("{%s,%Zu},%s,%u,,%llu,%u",
420 cookie
->name
, cookie
->nlen
, name
, nlen
,
421 (unsigned long long) ino
, dtype
);
423 /* insanity checks first */
424 BUILD_BUG_ON(sizeof(union afs_dir_block
) != 2048);
425 BUILD_BUG_ON(sizeof(union afs_dirent
) != 32);
427 if (cookie
->nlen
!= nlen
|| memcmp(cookie
->name
, name
, nlen
) != 0) {
432 cookie
->fid
.vnode
= ino
;
433 cookie
->fid
.unique
= dtype
;
436 _leave(" = -1 [found]");
441 * do a lookup in a directory
442 * - just returns the FID the dentry name maps to if found
444 static int afs_do_lookup(struct inode
*dir
, struct dentry
*dentry
,
445 struct afs_fid
*fid
, struct key
*key
)
447 struct afs_lookup_cookie cookie
;
448 struct afs_super_info
*as
;
452 _enter("{%lu},%p{%s},", dir
->i_ino
, dentry
, dentry
->d_name
.name
);
454 as
= dir
->i_sb
->s_fs_info
;
456 /* search the directory */
457 cookie
.name
= dentry
->d_name
.name
;
458 cookie
.nlen
= dentry
->d_name
.len
;
459 cookie
.fid
.vid
= as
->volume
->vid
;
463 ret
= afs_dir_iterate(dir
, &fpos
, &cookie
, afs_lookup_filldir
,
466 _leave(" = %d [iter]", ret
);
472 _leave(" = -ENOENT [not found]");
477 _leave(" = 0 { vn=%u u=%u }", fid
->vnode
, fid
->unique
);
482 * Try to auto mount the mountpoint with pseudo directory, if the autocell
483 * operation is setted.
485 static struct inode
*afs_try_auto_mntpt(
486 int ret
, struct dentry
*dentry
, struct inode
*dir
, struct key
*key
,
489 const char *devname
= dentry
->d_name
.name
;
490 struct afs_vnode
*vnode
= AFS_FS_I(dir
);
493 _enter("%d, %p{%s}, {%x:%u}, %p",
494 ret
, dentry
, devname
, vnode
->fid
.vid
, vnode
->fid
.vnode
, key
);
496 if (ret
!= -ENOENT
||
497 !test_bit(AFS_VNODE_AUTOCELL
, &vnode
->flags
))
500 inode
= afs_iget_autocell(dir
, devname
, strlen(devname
), key
);
502 ret
= PTR_ERR(inode
);
506 *fid
= AFS_FS_I(inode
)->fid
;
507 _leave("= %p", inode
);
516 * look up an entry in a directory
518 static struct dentry
*afs_lookup(struct inode
*dir
, struct dentry
*dentry
,
519 struct nameidata
*nd
)
521 struct afs_vnode
*vnode
;
527 vnode
= AFS_FS_I(dir
);
529 _enter("{%x:%u},%p{%s},",
530 vnode
->fid
.vid
, vnode
->fid
.vnode
, dentry
, dentry
->d_name
.name
);
532 ASSERTCMP(dentry
->d_inode
, ==, NULL
);
534 if (dentry
->d_name
.len
>= AFSNAMEMAX
) {
535 _leave(" = -ENAMETOOLONG");
536 return ERR_PTR(-ENAMETOOLONG
);
539 if (test_bit(AFS_VNODE_DELETED
, &vnode
->flags
)) {
540 _leave(" = -ESTALE");
541 return ERR_PTR(-ESTALE
);
544 key
= afs_request_key(vnode
->volume
->cell
);
546 _leave(" = %ld [key]", PTR_ERR(key
));
547 return ERR_CAST(key
);
550 ret
= afs_validate(vnode
, key
);
553 _leave(" = %d [val]", ret
);
557 ret
= afs_do_lookup(dir
, dentry
, &fid
, key
);
559 inode
= afs_try_auto_mntpt(ret
, dentry
, dir
, key
, &fid
);
560 if (!IS_ERR(inode
)) {
565 ret
= PTR_ERR(inode
);
567 if (ret
== -ENOENT
) {
569 _leave(" = NULL [negative]");
572 _leave(" = %d [do]", ret
);
575 dentry
->d_fsdata
= (void *)(unsigned long) vnode
->status
.data_version
;
577 /* instantiate the dentry */
578 inode
= afs_iget(dir
->i_sb
, key
, &fid
, NULL
, NULL
);
581 _leave(" = %ld", PTR_ERR(inode
));
582 return ERR_CAST(inode
);
586 d_add(dentry
, inode
);
587 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",
590 dentry
->d_inode
->i_ino
,
591 (unsigned long long)dentry
->d_inode
->i_version
);
597 * check that a dentry lookup hit has found a valid entry
598 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
601 static int afs_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
603 struct afs_vnode
*vnode
, *dir
;
604 struct afs_fid
uninitialized_var(fid
);
605 struct dentry
*parent
;
610 if (nd
->flags
& LOOKUP_RCU
)
613 vnode
= AFS_FS_I(dentry
->d_inode
);
616 _enter("{v={%x:%u} n=%s fl=%lx},",
617 vnode
->fid
.vid
, vnode
->fid
.vnode
, dentry
->d_name
.name
,
620 _enter("{neg n=%s}", dentry
->d_name
.name
);
622 key
= afs_request_key(AFS_FS_S(dentry
->d_sb
)->volume
->cell
);
626 /* lock down the parent dentry so we can peer at it */
627 parent
= dget_parent(dentry
);
628 if (!parent
->d_inode
)
631 dir
= AFS_FS_I(parent
->d_inode
);
633 /* validate the parent directory */
634 if (test_bit(AFS_VNODE_MODIFIED
, &dir
->flags
))
635 afs_validate(dir
, key
);
637 if (test_bit(AFS_VNODE_DELETED
, &dir
->flags
)) {
638 _debug("%s: parent dir deleted", dentry
->d_name
.name
);
642 dir_version
= (void *) (unsigned long) dir
->status
.data_version
;
643 if (dentry
->d_fsdata
== dir_version
)
644 goto out_valid
; /* the dir contents are unchanged */
646 _debug("dir modified");
648 /* search the directory for this vnode */
649 ret
= afs_do_lookup(&dir
->vfs_inode
, dentry
, &fid
, key
);
652 /* the filename maps to something */
653 if (!dentry
->d_inode
)
655 if (is_bad_inode(dentry
->d_inode
)) {
656 printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
657 parent
->d_name
.name
, dentry
->d_name
.name
);
661 /* if the vnode ID has changed, then the dirent points to a
663 if (fid
.vnode
!= vnode
->fid
.vnode
) {
664 _debug("%s: dirent changed [%u != %u]",
665 dentry
->d_name
.name
, fid
.vnode
,
670 /* if the vnode ID uniqifier has changed, then the file has
671 * been deleted and replaced, and the original vnode ID has
673 if (fid
.unique
!= vnode
->fid
.unique
) {
674 _debug("%s: file deleted (uq %u -> %u I:%llu)",
675 dentry
->d_name
.name
, fid
.unique
,
677 (unsigned long long)dentry
->d_inode
->i_version
);
678 spin_lock(&vnode
->lock
);
679 set_bit(AFS_VNODE_DELETED
, &vnode
->flags
);
680 spin_unlock(&vnode
->lock
);
686 /* the filename is unknown */
687 _debug("%s: dirent not found", dentry
->d_name
.name
);
693 _debug("failed to iterate dir %s: %d",
694 parent
->d_name
.name
, ret
);
699 dentry
->d_fsdata
= dir_version
;
703 _leave(" = 1 [valid]");
706 /* the dirent, if it exists, now points to a different vnode */
708 spin_lock(&dentry
->d_lock
);
709 dentry
->d_flags
|= DCACHE_NFSFS_RENAMED
;
710 spin_unlock(&dentry
->d_lock
);
713 if (dentry
->d_inode
) {
714 /* don't unhash if we have submounts */
715 if (have_submounts(dentry
))
719 _debug("dropping dentry %s/%s",
720 parent
->d_name
.name
, dentry
->d_name
.name
);
721 shrink_dcache_parent(dentry
);
726 _leave(" = 0 [bad]");
731 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
733 * - called from dput() when d_count is going to 0.
734 * - return 1 to request dentry be unhashed, 0 otherwise
736 static int afs_d_delete(const struct dentry
*dentry
)
738 _enter("%s", dentry
->d_name
.name
);
740 if (dentry
->d_flags
& DCACHE_NFSFS_RENAMED
)
743 if (dentry
->d_inode
&&
744 (test_bit(AFS_VNODE_DELETED
, &AFS_FS_I(dentry
->d_inode
)->flags
) ||
745 test_bit(AFS_VNODE_PSEUDODIR
, &AFS_FS_I(dentry
->d_inode
)->flags
)))
748 _leave(" = 0 [keep]");
752 _leave(" = 1 [zap]");
757 * handle dentry release
759 static void afs_d_release(struct dentry
*dentry
)
761 _enter("%s", dentry
->d_name
.name
);
765 * create a directory on an AFS filesystem
767 static int afs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
769 struct afs_file_status status
;
770 struct afs_callback cb
;
771 struct afs_server
*server
;
772 struct afs_vnode
*dvnode
, *vnode
;
778 dvnode
= AFS_FS_I(dir
);
780 _enter("{%x:%u},{%s},%o",
781 dvnode
->fid
.vid
, dvnode
->fid
.vnode
, dentry
->d_name
.name
, mode
);
784 if (dentry
->d_name
.len
>= AFSNAMEMAX
)
787 key
= afs_request_key(dvnode
->volume
->cell
);
794 ret
= afs_vnode_create(dvnode
, key
, dentry
->d_name
.name
,
795 mode
, &fid
, &status
, &cb
, &server
);
799 inode
= afs_iget(dir
->i_sb
, key
, &fid
, &status
, &cb
);
801 /* ENOMEM at a really inconvenient time - just abandon the new
802 * directory on the server */
803 ret
= PTR_ERR(inode
);
807 /* apply the status report we've got for the new vnode */
808 vnode
= AFS_FS_I(inode
);
809 spin_lock(&vnode
->lock
);
811 spin_unlock(&vnode
->lock
);
812 afs_vnode_finalise_status_update(vnode
, server
);
813 afs_put_server(server
);
815 d_instantiate(dentry
, inode
);
816 if (d_unhashed(dentry
)) {
817 _debug("not hashed");
825 afs_put_server(server
);
830 _leave(" = %d", ret
);
835 * remove a directory from an AFS filesystem
837 static int afs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
839 struct afs_vnode
*dvnode
, *vnode
;
843 dvnode
= AFS_FS_I(dir
);
845 _enter("{%x:%u},{%s}",
846 dvnode
->fid
.vid
, dvnode
->fid
.vnode
, dentry
->d_name
.name
);
848 dentry_unhash(dentry
);
851 if (dentry
->d_name
.len
>= AFSNAMEMAX
)
854 key
= afs_request_key(dvnode
->volume
->cell
);
860 ret
= afs_vnode_remove(dvnode
, key
, dentry
->d_name
.name
, true);
864 if (dentry
->d_inode
) {
865 vnode
= AFS_FS_I(dentry
->d_inode
);
866 clear_nlink(&vnode
->vfs_inode
);
867 set_bit(AFS_VNODE_DELETED
, &vnode
->flags
);
868 afs_discard_callback_on_delete(vnode
);
878 _leave(" = %d", ret
);
883 * remove a file from an AFS filesystem
885 static int afs_unlink(struct inode
*dir
, struct dentry
*dentry
)
887 struct afs_vnode
*dvnode
, *vnode
;
891 dvnode
= AFS_FS_I(dir
);
893 _enter("{%x:%u},{%s}",
894 dvnode
->fid
.vid
, dvnode
->fid
.vnode
, dentry
->d_name
.name
);
897 if (dentry
->d_name
.len
>= AFSNAMEMAX
)
900 key
= afs_request_key(dvnode
->volume
->cell
);
906 if (dentry
->d_inode
) {
907 vnode
= AFS_FS_I(dentry
->d_inode
);
909 /* make sure we have a callback promise on the victim */
910 ret
= afs_validate(vnode
, key
);
915 ret
= afs_vnode_remove(dvnode
, key
, dentry
->d_name
.name
, false);
919 if (dentry
->d_inode
) {
920 /* if the file wasn't deleted due to excess hard links, the
921 * fileserver will break the callback promise on the file - if
922 * it had one - before it returns to us, and if it was deleted,
925 * however, if we didn't have a callback promise outstanding,
926 * or it was outstanding on a different server, then it won't
929 vnode
= AFS_FS_I(dentry
->d_inode
);
930 if (test_bit(AFS_VNODE_DELETED
, &vnode
->flags
))
931 _debug("AFS_VNODE_DELETED");
932 if (test_bit(AFS_VNODE_CB_BROKEN
, &vnode
->flags
))
933 _debug("AFS_VNODE_CB_BROKEN");
934 set_bit(AFS_VNODE_CB_BROKEN
, &vnode
->flags
);
935 ret
= afs_validate(vnode
, key
);
936 _debug("nlink %d [val %d]", vnode
->vfs_inode
.i_nlink
, ret
);
946 _leave(" = %d", ret
);
951 * create a regular file on an AFS filesystem
953 static int afs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
954 struct nameidata
*nd
)
956 struct afs_file_status status
;
957 struct afs_callback cb
;
958 struct afs_server
*server
;
959 struct afs_vnode
*dvnode
, *vnode
;
965 dvnode
= AFS_FS_I(dir
);
967 _enter("{%x:%u},{%s},%o,",
968 dvnode
->fid
.vid
, dvnode
->fid
.vnode
, dentry
->d_name
.name
, mode
);
971 if (dentry
->d_name
.len
>= AFSNAMEMAX
)
974 key
= afs_request_key(dvnode
->volume
->cell
);
981 ret
= afs_vnode_create(dvnode
, key
, dentry
->d_name
.name
,
982 mode
, &fid
, &status
, &cb
, &server
);
986 inode
= afs_iget(dir
->i_sb
, key
, &fid
, &status
, &cb
);
988 /* ENOMEM at a really inconvenient time - just abandon the new
989 * directory on the server */
990 ret
= PTR_ERR(inode
);
994 /* apply the status report we've got for the new vnode */
995 vnode
= AFS_FS_I(inode
);
996 spin_lock(&vnode
->lock
);
998 spin_unlock(&vnode
->lock
);
999 afs_vnode_finalise_status_update(vnode
, server
);
1000 afs_put_server(server
);
1002 d_instantiate(dentry
, inode
);
1003 if (d_unhashed(dentry
)) {
1004 _debug("not hashed");
1012 afs_put_server(server
);
1017 _leave(" = %d", ret
);
1022 * create a hard link between files in an AFS filesystem
1024 static int afs_link(struct dentry
*from
, struct inode
*dir
,
1025 struct dentry
*dentry
)
1027 struct afs_vnode
*dvnode
, *vnode
;
1031 vnode
= AFS_FS_I(from
->d_inode
);
1032 dvnode
= AFS_FS_I(dir
);
1034 _enter("{%x:%u},{%x:%u},{%s}",
1035 vnode
->fid
.vid
, vnode
->fid
.vnode
,
1036 dvnode
->fid
.vid
, dvnode
->fid
.vnode
,
1037 dentry
->d_name
.name
);
1039 ret
= -ENAMETOOLONG
;
1040 if (dentry
->d_name
.len
>= AFSNAMEMAX
)
1043 key
= afs_request_key(dvnode
->volume
->cell
);
1049 ret
= afs_vnode_link(dvnode
, vnode
, key
, dentry
->d_name
.name
);
1053 ihold(&vnode
->vfs_inode
);
1054 d_instantiate(dentry
, &vnode
->vfs_inode
);
1063 _leave(" = %d", ret
);
1068 * create a symlink in an AFS filesystem
1070 static int afs_symlink(struct inode
*dir
, struct dentry
*dentry
,
1071 const char *content
)
1073 struct afs_file_status status
;
1074 struct afs_server
*server
;
1075 struct afs_vnode
*dvnode
, *vnode
;
1077 struct inode
*inode
;
1081 dvnode
= AFS_FS_I(dir
);
1083 _enter("{%x:%u},{%s},%s",
1084 dvnode
->fid
.vid
, dvnode
->fid
.vnode
, dentry
->d_name
.name
,
1087 ret
= -ENAMETOOLONG
;
1088 if (dentry
->d_name
.len
>= AFSNAMEMAX
)
1092 if (strlen(content
) >= AFSPATHMAX
)
1095 key
= afs_request_key(dvnode
->volume
->cell
);
1101 ret
= afs_vnode_symlink(dvnode
, key
, dentry
->d_name
.name
, content
,
1102 &fid
, &status
, &server
);
1106 inode
= afs_iget(dir
->i_sb
, key
, &fid
, &status
, NULL
);
1107 if (IS_ERR(inode
)) {
1108 /* ENOMEM at a really inconvenient time - just abandon the new
1109 * directory on the server */
1110 ret
= PTR_ERR(inode
);
1114 /* apply the status report we've got for the new vnode */
1115 vnode
= AFS_FS_I(inode
);
1116 spin_lock(&vnode
->lock
);
1117 vnode
->update_cnt
++;
1118 spin_unlock(&vnode
->lock
);
1119 afs_vnode_finalise_status_update(vnode
, server
);
1120 afs_put_server(server
);
1122 d_instantiate(dentry
, inode
);
1123 if (d_unhashed(dentry
)) {
1124 _debug("not hashed");
1132 afs_put_server(server
);
1137 _leave(" = %d", ret
);
1142 * rename a file in an AFS filesystem and/or move it between directories
1144 static int afs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
1145 struct inode
*new_dir
, struct dentry
*new_dentry
)
1147 struct afs_vnode
*orig_dvnode
, *new_dvnode
, *vnode
;
1151 if (new_dentry
->d_inode
&& S_ISDIR(new_dentry
->d_inode
->i_mode
))
1152 dentry_unhash(new_dentry
);
1154 vnode
= AFS_FS_I(old_dentry
->d_inode
);
1155 orig_dvnode
= AFS_FS_I(old_dir
);
1156 new_dvnode
= AFS_FS_I(new_dir
);
1158 _enter("{%x:%u},{%x:%u},{%x:%u},{%s}",
1159 orig_dvnode
->fid
.vid
, orig_dvnode
->fid
.vnode
,
1160 vnode
->fid
.vid
, vnode
->fid
.vnode
,
1161 new_dvnode
->fid
.vid
, new_dvnode
->fid
.vnode
,
1162 new_dentry
->d_name
.name
);
1164 ret
= -ENAMETOOLONG
;
1165 if (new_dentry
->d_name
.len
>= AFSNAMEMAX
)
1168 key
= afs_request_key(orig_dvnode
->volume
->cell
);
1174 ret
= afs_vnode_rename(orig_dvnode
, new_dvnode
, key
,
1175 old_dentry
->d_name
.name
,
1176 new_dentry
->d_name
.name
);
1187 _leave(" = %d", ret
);