2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "xfs_format.h"
21 #include "xfs_log_format.h"
22 #include "xfs_trans_resv.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_trans.h"
31 #include "xfs_inode_item.h"
34 #include "xfs_dir2_priv.h"
35 #include "xfs_error.h"
36 #include "xfs_trace.h"
37 #include "xfs_dinode.h"
39 struct xfs_name xfs_name_dotdot
= { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR
};
43 * ASCII case-insensitive (ie. A-Z) support for directories that was
47 xfs_ascii_ci_hashname(
48 struct xfs_name
*name
)
53 for (i
= 0, hash
= 0; i
< name
->len
; i
++)
54 hash
= tolower(name
->name
[i
]) ^ rol32(hash
, 7);
60 xfs_ascii_ci_compname(
61 struct xfs_da_args
*args
,
62 const unsigned char *name
,
65 enum xfs_dacmp result
;
68 if (args
->namelen
!= len
)
69 return XFS_CMP_DIFFERENT
;
71 result
= XFS_CMP_EXACT
;
72 for (i
= 0; i
< len
; i
++) {
73 if (args
->name
[i
] == name
[i
])
75 if (tolower(args
->name
[i
]) != tolower(name
[i
]))
76 return XFS_CMP_DIFFERENT
;
77 result
= XFS_CMP_CASE
;
83 static struct xfs_nameops xfs_ascii_ci_nameops
= {
84 .hashname
= xfs_ascii_ci_hashname
,
85 .compname
= xfs_ascii_ci_compname
,
92 struct xfs_da_geometry
*dageo
;
96 ASSERT(mp
->m_sb
.sb_versionnum
& XFS_SB_VERSION_DIRV2BIT
);
97 ASSERT((1 << (mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
)) <=
100 mp
->m_dir_inode_ops
= xfs_dir_get_ops(mp
, NULL
);
101 mp
->m_nondir_inode_ops
= xfs_nondir_get_ops(mp
, NULL
);
103 nodehdr_size
= mp
->m_dir_inode_ops
->node_hdr_size
;
104 mp
->m_dir_geo
= kmem_zalloc(sizeof(struct xfs_da_geometry
),
105 KM_SLEEP
| KM_MAYFAIL
);
106 mp
->m_attr_geo
= kmem_zalloc(sizeof(struct xfs_da_geometry
),
107 KM_SLEEP
| KM_MAYFAIL
);
108 if (!mp
->m_dir_geo
|| !mp
->m_attr_geo
) {
109 kmem_free(mp
->m_dir_geo
);
110 kmem_free(mp
->m_attr_geo
);
114 /* set up directory geometry */
115 dageo
= mp
->m_dir_geo
;
116 dageo
->blklog
= mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
;
117 dageo
->fsblog
= mp
->m_sb
.sb_blocklog
;
118 dageo
->blksize
= 1 << dageo
->blklog
;
119 dageo
->fsbcount
= 1 << mp
->m_sb
.sb_dirblklog
;
122 * Now we've set up the block conversion variables, we can calculate the
123 * segment block constants using the geometry structure.
125 dageo
->datablk
= xfs_dir2_byte_to_da(dageo
, XFS_DIR2_DATA_OFFSET
);
126 dageo
->leafblk
= xfs_dir2_byte_to_da(dageo
, XFS_DIR2_LEAF_OFFSET
);
127 dageo
->freeblk
= xfs_dir2_byte_to_da(dageo
, XFS_DIR2_FREE_OFFSET
);
128 dageo
->node_ents
= (dageo
->blksize
- nodehdr_size
) /
129 (uint
)sizeof(xfs_da_node_entry_t
);
130 dageo
->magicpct
= (dageo
->blksize
* 37) / 100;
132 /* set up attribute geometry - single fsb only */
133 dageo
= mp
->m_attr_geo
;
134 dageo
->blklog
= mp
->m_sb
.sb_blocklog
;
135 dageo
->fsblog
= mp
->m_sb
.sb_blocklog
;
136 dageo
->blksize
= 1 << dageo
->blklog
;
138 dageo
->node_ents
= (dageo
->blksize
- nodehdr_size
) /
139 (uint
)sizeof(xfs_da_node_entry_t
);
140 dageo
->magicpct
= (dageo
->blksize
* 37) / 100;
142 if (xfs_sb_version_hasasciici(&mp
->m_sb
))
143 mp
->m_dirnameops
= &xfs_ascii_ci_nameops
;
145 mp
->m_dirnameops
= &xfs_default_nameops
;
152 struct xfs_mount
*mp
)
154 kmem_free(mp
->m_dir_geo
);
155 kmem_free(mp
->m_attr_geo
);
159 * Return 1 if directory contains only "." and "..".
165 xfs_dir2_sf_hdr_t
*sfp
;
167 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
168 if (dp
->i_d
.di_size
== 0) /* might happen during shutdown. */
170 if (dp
->i_d
.di_size
> XFS_IFORK_DSIZE(dp
))
172 sfp
= (xfs_dir2_sf_hdr_t
*)dp
->i_df
.if_u1
.if_data
;
177 * Validate a given inode number.
180 xfs_dir_ino_validate(
184 xfs_agblock_t agblkno
;
190 agno
= XFS_INO_TO_AGNO(mp
, ino
);
191 agblkno
= XFS_INO_TO_AGBNO(mp
, ino
);
192 ioff
= XFS_INO_TO_OFFSET(mp
, ino
);
193 agino
= XFS_OFFBNO_TO_AGINO(mp
, agblkno
, ioff
);
195 agno
< mp
->m_sb
.sb_agcount
&&
196 agblkno
< mp
->m_sb
.sb_agblocks
&&
198 ioff
< (1 << mp
->m_sb
.sb_inopblog
) &&
199 XFS_AGINO_TO_INO(mp
, agno
, agino
) == ino
;
200 if (unlikely(XFS_TEST_ERROR(!ino_ok
, mp
, XFS_ERRTAG_DIR_INO_VALIDATE
,
201 XFS_RANDOM_DIR_INO_VALIDATE
))) {
202 xfs_warn(mp
, "Invalid inode number 0x%Lx",
203 (unsigned long long) ino
);
204 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW
, mp
);
205 return -EFSCORRUPTED
;
211 * Initialize a directory with its "." and ".." entries.
219 struct xfs_da_args
*args
;
222 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
223 error
= xfs_dir_ino_validate(tp
->t_mountp
, pdp
->i_ino
);
227 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
231 args
->geo
= dp
->i_mount
->m_dir_geo
;
234 error
= xfs_dir2_sf_create(args
, pdp
->i_ino
);
240 Enter a name in a directory.
246 struct xfs_name
*name
,
247 xfs_ino_t inum
, /* new entry inode number */
248 xfs_fsblock_t
*first
, /* bmap's firstblock */
249 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
250 xfs_extlen_t total
) /* bmap's total block count */
252 struct xfs_da_args
*args
;
254 int v
; /* type-checking value */
256 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
257 rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
);
260 XFS_STATS_INC(xs_dir_create
);
262 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
266 args
->geo
= dp
->i_mount
->m_dir_geo
;
267 args
->name
= name
->name
;
268 args
->namelen
= name
->len
;
269 args
->filetype
= name
->type
;
270 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
271 args
->inumber
= inum
;
273 args
->firstblock
= first
;
276 args
->whichfork
= XFS_DATA_FORK
;
278 args
->op_flags
= XFS_DA_OP_ADDNAME
| XFS_DA_OP_OKNOENT
;
280 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
281 rval
= xfs_dir2_sf_addname(args
);
285 rval
= xfs_dir2_isblock(args
, &v
);
289 rval
= xfs_dir2_block_addname(args
);
293 rval
= xfs_dir2_isleaf(args
, &v
);
297 rval
= xfs_dir2_leaf_addname(args
);
299 rval
= xfs_dir2_node_addname(args
);
307 * If doing a CI lookup and case-insensitive match, dup actual name into
308 * args.value. Return EEXIST for success (ie. name found) or an error.
311 xfs_dir_cilookup_result(
312 struct xfs_da_args
*args
,
313 const unsigned char *name
,
316 if (args
->cmpresult
== XFS_CMP_DIFFERENT
)
318 if (args
->cmpresult
!= XFS_CMP_CASE
||
319 !(args
->op_flags
& XFS_DA_OP_CILOOKUP
))
322 args
->value
= kmem_alloc(len
, KM_NOFS
| KM_MAYFAIL
);
326 memcpy(args
->value
, name
, len
);
327 args
->valuelen
= len
;
332 * Lookup a name in a directory, give back the inode number.
333 * If ci_name is not NULL, returns the actual name in ci_name if it differs
334 * to name, or ci_name->name is set to NULL for an exact match.
341 struct xfs_name
*name
,
342 xfs_ino_t
*inum
, /* out: inode number */
343 struct xfs_name
*ci_name
) /* out: actual name if CI match */
345 struct xfs_da_args
*args
;
347 int v
; /* type-checking value */
349 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
350 XFS_STATS_INC(xs_dir_lookup
);
353 * We need to use KM_NOFS here so that lockdep will not throw false
354 * positive deadlock warnings on a non-transactional lookup path. It is
355 * safe to recurse into inode recalim in that case, but lockdep can't
356 * easily be taught about it. Hence KM_NOFS avoids having to add more
357 * lockdep Doing this avoids having to add a bunch of lockdep class
358 * annotations into the reclaim path for the ilock.
360 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
361 args
->geo
= dp
->i_mount
->m_dir_geo
;
362 args
->name
= name
->name
;
363 args
->namelen
= name
->len
;
364 args
->filetype
= name
->type
;
365 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
367 args
->whichfork
= XFS_DATA_FORK
;
369 args
->op_flags
= XFS_DA_OP_OKNOENT
;
371 args
->op_flags
|= XFS_DA_OP_CILOOKUP
;
373 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
374 rval
= xfs_dir2_sf_lookup(args
);
378 rval
= xfs_dir2_isblock(args
, &v
);
382 rval
= xfs_dir2_block_lookup(args
);
386 rval
= xfs_dir2_isleaf(args
, &v
);
390 rval
= xfs_dir2_leaf_lookup(args
);
392 rval
= xfs_dir2_node_lookup(args
);
398 *inum
= args
->inumber
;
400 ci_name
->name
= args
->value
;
401 ci_name
->len
= args
->valuelen
;
410 * Remove an entry from a directory.
416 struct xfs_name
*name
,
418 xfs_fsblock_t
*first
, /* bmap's firstblock */
419 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
420 xfs_extlen_t total
) /* bmap's total block count */
422 struct xfs_da_args
*args
;
424 int v
; /* type-checking value */
426 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
427 XFS_STATS_INC(xs_dir_remove
);
429 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
433 args
->geo
= dp
->i_mount
->m_dir_geo
;
434 args
->name
= name
->name
;
435 args
->namelen
= name
->len
;
436 args
->filetype
= name
->type
;
437 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
440 args
->firstblock
= first
;
443 args
->whichfork
= XFS_DATA_FORK
;
446 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
447 rval
= xfs_dir2_sf_removename(args
);
451 rval
= xfs_dir2_isblock(args
, &v
);
455 rval
= xfs_dir2_block_removename(args
);
459 rval
= xfs_dir2_isleaf(args
, &v
);
463 rval
= xfs_dir2_leaf_removename(args
);
465 rval
= xfs_dir2_node_removename(args
);
472 * Replace the inode number of a directory entry.
478 struct xfs_name
*name
, /* name of entry to replace */
479 xfs_ino_t inum
, /* new inode number */
480 xfs_fsblock_t
*first
, /* bmap's firstblock */
481 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
482 xfs_extlen_t total
) /* bmap's total block count */
484 struct xfs_da_args
*args
;
486 int v
; /* type-checking value */
488 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
490 rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
);
494 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
498 args
->geo
= dp
->i_mount
->m_dir_geo
;
499 args
->name
= name
->name
;
500 args
->namelen
= name
->len
;
501 args
->filetype
= name
->type
;
502 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
503 args
->inumber
= inum
;
505 args
->firstblock
= first
;
508 args
->whichfork
= XFS_DATA_FORK
;
511 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
512 rval
= xfs_dir2_sf_replace(args
);
516 rval
= xfs_dir2_isblock(args
, &v
);
520 rval
= xfs_dir2_block_replace(args
);
524 rval
= xfs_dir2_isleaf(args
, &v
);
528 rval
= xfs_dir2_leaf_replace(args
);
530 rval
= xfs_dir2_node_replace(args
);
537 * See if this entry can be added to the directory without allocating space.
538 * First checks that the caller couldn't reserve enough space (resblks = 0).
544 struct xfs_name
*name
, /* name of entry to add */
547 struct xfs_da_args
*args
;
549 int v
; /* type-checking value */
554 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
556 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
560 args
->geo
= dp
->i_mount
->m_dir_geo
;
561 args
->name
= name
->name
;
562 args
->namelen
= name
->len
;
563 args
->filetype
= name
->type
;
564 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
566 args
->whichfork
= XFS_DATA_FORK
;
568 args
->op_flags
= XFS_DA_OP_JUSTCHECK
| XFS_DA_OP_ADDNAME
|
571 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
572 rval
= xfs_dir2_sf_addname(args
);
576 rval
= xfs_dir2_isblock(args
, &v
);
580 rval
= xfs_dir2_block_addname(args
);
584 rval
= xfs_dir2_isleaf(args
, &v
);
588 rval
= xfs_dir2_leaf_addname(args
);
590 rval
= xfs_dir2_node_addname(args
);
601 * Add a block to the directory.
603 * This routine is for data and free blocks, not leaf/node blocks which are
604 * handled by xfs_da_grow_inode.
608 struct xfs_da_args
*args
,
609 int space
, /* v2 dir's space XFS_DIR2_xxx_SPACE */
610 xfs_dir2_db_t
*dbp
) /* out: block number added */
612 struct xfs_inode
*dp
= args
->dp
;
613 struct xfs_mount
*mp
= dp
->i_mount
;
614 xfs_fileoff_t bno
; /* directory offset of new block */
615 int count
; /* count of filesystem blocks */
618 trace_xfs_dir2_grow_inode(args
, space
);
621 * Set lowest possible block in the space requested.
623 bno
= XFS_B_TO_FSBT(mp
, space
* XFS_DIR2_SPACE_SIZE
);
624 count
= args
->geo
->fsbcount
;
626 error
= xfs_da_grow_inode_int(args
, &bno
, count
);
630 *dbp
= xfs_dir2_da_to_db(args
->geo
, (xfs_dablk_t
)bno
);
633 * Update file's size if this is the data space and it grew.
635 if (space
== XFS_DIR2_DATA_SPACE
) {
636 xfs_fsize_t size
; /* directory file (data) size */
638 size
= XFS_FSB_TO_B(mp
, bno
+ count
);
639 if (size
> dp
->i_d
.di_size
) {
640 dp
->i_d
.di_size
= size
;
641 xfs_trans_log_inode(args
->trans
, dp
, XFS_ILOG_CORE
);
648 * See if the directory is a single-block form directory.
652 struct xfs_da_args
*args
,
653 int *vp
) /* out: 1 is block, 0 is not block */
655 xfs_fileoff_t last
; /* last file offset */
658 if ((rval
= xfs_bmap_last_offset(args
->dp
, &last
, XFS_DATA_FORK
)))
660 rval
= XFS_FSB_TO_B(args
->dp
->i_mount
, last
) == args
->geo
->blksize
;
661 ASSERT(rval
== 0 || args
->dp
->i_d
.di_size
== args
->geo
->blksize
);
667 * See if the directory is a single-leaf form directory.
671 struct xfs_da_args
*args
,
672 int *vp
) /* out: 1 is block, 0 is not block */
674 xfs_fileoff_t last
; /* last file offset */
677 if ((rval
= xfs_bmap_last_offset(args
->dp
, &last
, XFS_DATA_FORK
)))
679 *vp
= last
== args
->geo
->leafblk
+ args
->geo
->fsbcount
;
684 * Remove the given block from the directory.
685 * This routine is used for data and free blocks, leaf/node are done
686 * by xfs_da_shrink_inode.
689 xfs_dir2_shrink_inode(
694 xfs_fileoff_t bno
; /* directory file offset */
695 xfs_dablk_t da
; /* directory file offset */
696 int done
; /* bunmap is finished */
702 trace_xfs_dir2_shrink_inode(args
, db
);
707 da
= xfs_dir2_db_to_da(args
->geo
, db
);
709 * Unmap the fsblock(s).
711 if ((error
= xfs_bunmapi(tp
, dp
, da
, args
->geo
->fsbcount
,
712 XFS_BMAPI_METADATA
, 0, args
->firstblock
, args
->flist
,
715 * ENOSPC actually can happen if we're in a removename with
716 * no space reservation, and the resulting block removal
717 * would cause a bmap btree split or conversion from extents
718 * to btree. This can only happen for un-fragmented
719 * directory blocks, since you need to be punching out
720 * the middle of an extent.
721 * In this case we need to leave the block in the file,
723 * So the block has to be in a consistent empty state
724 * and appropriately logged.
725 * We don't free up the buffer, the caller can tell it
726 * hasn't happened since it got an error back.
732 * Invalidate the buffer from the transaction.
734 xfs_trans_binval(tp
, bp
);
736 * If it's not a data block, we're done.
738 if (db
>= xfs_dir2_byte_to_db(args
->geo
, XFS_DIR2_LEAF_OFFSET
))
741 * If the block isn't the last one in the directory, we're done.
743 if (dp
->i_d
.di_size
> xfs_dir2_db_off_to_byte(args
->geo
, db
+ 1, 0))
746 if ((error
= xfs_bmap_last_before(tp
, dp
, &bno
, XFS_DATA_FORK
))) {
748 * This can't really happen unless there's kernel corruption.
752 if (db
== args
->geo
->datablk
)
757 * Set the size to the new last block.
759 dp
->i_d
.di_size
= XFS_FSB_TO_B(mp
, bno
);
760 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);