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
,
95 ASSERT(xfs_sb_version_hasdirv2(&mp
->m_sb
));
96 ASSERT((1 << (mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
)) <=
99 mp
->m_dir_inode_ops
= xfs_dir_get_ops(mp
, NULL
);
100 mp
->m_nondir_inode_ops
= xfs_nondir_get_ops(mp
, NULL
);
102 mp
->m_dirblksize
= 1 << (mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
);
103 mp
->m_dirblkfsbs
= 1 << mp
->m_sb
.sb_dirblklog
;
104 mp
->m_dirdatablk
= xfs_dir2_db_to_da(mp
, XFS_DIR2_DATA_FIRSTDB(mp
));
105 mp
->m_dirleafblk
= xfs_dir2_db_to_da(mp
, XFS_DIR2_LEAF_FIRSTDB(mp
));
106 mp
->m_dirfreeblk
= xfs_dir2_db_to_da(mp
, XFS_DIR2_FREE_FIRSTDB(mp
));
108 nodehdr_size
= mp
->m_dir_inode_ops
->node_hdr_size
;
109 mp
->m_attr_node_ents
= (mp
->m_sb
.sb_blocksize
- nodehdr_size
) /
110 (uint
)sizeof(xfs_da_node_entry_t
);
111 mp
->m_dir_node_ents
= (mp
->m_dirblksize
- nodehdr_size
) /
112 (uint
)sizeof(xfs_da_node_entry_t
);
114 mp
->m_dir_magicpct
= (mp
->m_dirblksize
* 37) / 100;
115 if (xfs_sb_version_hasasciici(&mp
->m_sb
))
116 mp
->m_dirnameops
= &xfs_ascii_ci_nameops
;
118 mp
->m_dirnameops
= &xfs_default_nameops
;
123 * Return 1 if directory contains only "." and "..".
129 xfs_dir2_sf_hdr_t
*sfp
;
131 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
132 if (dp
->i_d
.di_size
== 0) /* might happen during shutdown. */
134 if (dp
->i_d
.di_size
> XFS_IFORK_DSIZE(dp
))
136 sfp
= (xfs_dir2_sf_hdr_t
*)dp
->i_df
.if_u1
.if_data
;
141 * Validate a given inode number.
144 xfs_dir_ino_validate(
148 xfs_agblock_t agblkno
;
154 agno
= XFS_INO_TO_AGNO(mp
, ino
);
155 agblkno
= XFS_INO_TO_AGBNO(mp
, ino
);
156 ioff
= XFS_INO_TO_OFFSET(mp
, ino
);
157 agino
= XFS_OFFBNO_TO_AGINO(mp
, agblkno
, ioff
);
159 agno
< mp
->m_sb
.sb_agcount
&&
160 agblkno
< mp
->m_sb
.sb_agblocks
&&
162 ioff
< (1 << mp
->m_sb
.sb_inopblog
) &&
163 XFS_AGINO_TO_INO(mp
, agno
, agino
) == ino
;
164 if (unlikely(XFS_TEST_ERROR(!ino_ok
, mp
, XFS_ERRTAG_DIR_INO_VALIDATE
,
165 XFS_RANDOM_DIR_INO_VALIDATE
))) {
166 xfs_warn(mp
, "Invalid inode number 0x%Lx",
167 (unsigned long long) ino
);
168 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW
, mp
);
169 return XFS_ERROR(EFSCORRUPTED
);
175 * Initialize a directory with its "." and ".." entries.
183 struct xfs_da_args
*args
;
186 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
187 error
= xfs_dir_ino_validate(tp
->t_mountp
, pdp
->i_ino
);
191 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
197 error
= xfs_dir2_sf_create(args
, pdp
->i_ino
);
203 Enter a name in a directory.
209 struct xfs_name
*name
,
210 xfs_ino_t inum
, /* new entry inode number */
211 xfs_fsblock_t
*first
, /* bmap's firstblock */
212 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
213 xfs_extlen_t total
) /* bmap's total block count */
215 struct xfs_da_args
*args
;
217 int v
; /* type-checking value */
219 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
220 rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
);
223 XFS_STATS_INC(xs_dir_create
);
225 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
229 args
->name
= name
->name
;
230 args
->namelen
= name
->len
;
231 args
->filetype
= name
->type
;
232 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
233 args
->inumber
= inum
;
235 args
->firstblock
= first
;
238 args
->whichfork
= XFS_DATA_FORK
;
240 args
->op_flags
= XFS_DA_OP_ADDNAME
| XFS_DA_OP_OKNOENT
;
242 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
243 rval
= xfs_dir2_sf_addname(args
);
247 rval
= xfs_dir2_isblock(tp
, dp
, &v
);
251 rval
= xfs_dir2_block_addname(args
);
255 rval
= xfs_dir2_isleaf(tp
, dp
, &v
);
259 rval
= xfs_dir2_leaf_addname(args
);
261 rval
= xfs_dir2_node_addname(args
);
269 * If doing a CI lookup and case-insensitive match, dup actual name into
270 * args.value. Return EEXIST for success (ie. name found) or an error.
273 xfs_dir_cilookup_result(
274 struct xfs_da_args
*args
,
275 const unsigned char *name
,
278 if (args
->cmpresult
== XFS_CMP_DIFFERENT
)
280 if (args
->cmpresult
!= XFS_CMP_CASE
||
281 !(args
->op_flags
& XFS_DA_OP_CILOOKUP
))
284 args
->value
= kmem_alloc(len
, KM_NOFS
| KM_MAYFAIL
);
288 memcpy(args
->value
, name
, len
);
289 args
->valuelen
= len
;
294 * Lookup a name in a directory, give back the inode number.
295 * If ci_name is not NULL, returns the actual name in ci_name if it differs
296 * to name, or ci_name->name is set to NULL for an exact match.
303 struct xfs_name
*name
,
304 xfs_ino_t
*inum
, /* out: inode number */
305 struct xfs_name
*ci_name
) /* out: actual name if CI match */
307 struct xfs_da_args
*args
;
309 int v
; /* type-checking value */
311 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
312 XFS_STATS_INC(xs_dir_lookup
);
315 * We need to use KM_NOFS here so that lockdep will not throw false
316 * positive deadlock warnings on a non-transactional lookup path. It is
317 * safe to recurse into inode recalim in that case, but lockdep can't
318 * easily be taught about it. Hence KM_NOFS avoids having to add more
319 * lockdep Doing this avoids having to add a bunch of lockdep class
320 * annotations into the reclaim path for the ilock.
322 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
323 args
->name
= name
->name
;
324 args
->namelen
= name
->len
;
325 args
->filetype
= name
->type
;
326 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
328 args
->whichfork
= XFS_DATA_FORK
;
330 args
->op_flags
= XFS_DA_OP_OKNOENT
;
332 args
->op_flags
|= XFS_DA_OP_CILOOKUP
;
334 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
335 rval
= xfs_dir2_sf_lookup(args
);
339 rval
= xfs_dir2_isblock(tp
, dp
, &v
);
343 rval
= xfs_dir2_block_lookup(args
);
347 rval
= xfs_dir2_isleaf(tp
, dp
, &v
);
351 rval
= xfs_dir2_leaf_lookup(args
);
353 rval
= xfs_dir2_node_lookup(args
);
359 *inum
= args
->inumber
;
361 ci_name
->name
= args
->value
;
362 ci_name
->len
= args
->valuelen
;
371 * Remove an entry from a directory.
377 struct xfs_name
*name
,
379 xfs_fsblock_t
*first
, /* bmap's firstblock */
380 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
381 xfs_extlen_t total
) /* bmap's total block count */
383 struct xfs_da_args
*args
;
385 int v
; /* type-checking value */
387 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
388 XFS_STATS_INC(xs_dir_remove
);
390 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
394 args
->name
= name
->name
;
395 args
->namelen
= name
->len
;
396 args
->filetype
= name
->type
;
397 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
400 args
->firstblock
= first
;
403 args
->whichfork
= XFS_DATA_FORK
;
406 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
407 rval
= xfs_dir2_sf_removename(args
);
411 rval
= xfs_dir2_isblock(tp
, dp
, &v
);
415 rval
= xfs_dir2_block_removename(args
);
419 rval
= xfs_dir2_isleaf(tp
, dp
, &v
);
423 rval
= xfs_dir2_leaf_removename(args
);
425 rval
= xfs_dir2_node_removename(args
);
432 * Replace the inode number of a directory entry.
438 struct xfs_name
*name
, /* name of entry to replace */
439 xfs_ino_t inum
, /* new inode number */
440 xfs_fsblock_t
*first
, /* bmap's firstblock */
441 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
442 xfs_extlen_t total
) /* bmap's total block count */
444 struct xfs_da_args
*args
;
446 int v
; /* type-checking value */
448 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
450 rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
);
454 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
458 args
->name
= name
->name
;
459 args
->namelen
= name
->len
;
460 args
->filetype
= name
->type
;
461 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
462 args
->inumber
= inum
;
464 args
->firstblock
= first
;
467 args
->whichfork
= XFS_DATA_FORK
;
470 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
471 rval
= xfs_dir2_sf_replace(args
);
475 rval
= xfs_dir2_isblock(tp
, dp
, &v
);
479 rval
= xfs_dir2_block_replace(args
);
483 rval
= xfs_dir2_isleaf(tp
, dp
, &v
);
487 rval
= xfs_dir2_leaf_replace(args
);
489 rval
= xfs_dir2_node_replace(args
);
496 * See if this entry can be added to the directory without allocating space.
497 * First checks that the caller couldn't reserve enough space (resblks = 0).
503 struct xfs_name
*name
, /* name of entry to add */
506 struct xfs_da_args
*args
;
508 int v
; /* type-checking value */
513 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
515 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
519 args
->name
= name
->name
;
520 args
->namelen
= name
->len
;
521 args
->filetype
= name
->type
;
522 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
524 args
->whichfork
= XFS_DATA_FORK
;
526 args
->op_flags
= XFS_DA_OP_JUSTCHECK
| XFS_DA_OP_ADDNAME
|
529 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
530 rval
= xfs_dir2_sf_addname(args
);
534 rval
= xfs_dir2_isblock(tp
, dp
, &v
);
538 rval
= xfs_dir2_block_addname(args
);
542 rval
= xfs_dir2_isleaf(tp
, dp
, &v
);
546 rval
= xfs_dir2_leaf_addname(args
);
548 rval
= xfs_dir2_node_addname(args
);
559 * Add a block to the directory.
561 * This routine is for data and free blocks, not leaf/node blocks which are
562 * handled by xfs_da_grow_inode.
566 struct xfs_da_args
*args
,
567 int space
, /* v2 dir's space XFS_DIR2_xxx_SPACE */
568 xfs_dir2_db_t
*dbp
) /* out: block number added */
570 struct xfs_inode
*dp
= args
->dp
;
571 struct xfs_mount
*mp
= dp
->i_mount
;
572 xfs_fileoff_t bno
; /* directory offset of new block */
573 int count
; /* count of filesystem blocks */
576 trace_xfs_dir2_grow_inode(args
, space
);
579 * Set lowest possible block in the space requested.
581 bno
= XFS_B_TO_FSBT(mp
, space
* XFS_DIR2_SPACE_SIZE
);
582 count
= mp
->m_dirblkfsbs
;
584 error
= xfs_da_grow_inode_int(args
, &bno
, count
);
588 *dbp
= xfs_dir2_da_to_db(mp
, (xfs_dablk_t
)bno
);
591 * Update file's size if this is the data space and it grew.
593 if (space
== XFS_DIR2_DATA_SPACE
) {
594 xfs_fsize_t size
; /* directory file (data) size */
596 size
= XFS_FSB_TO_B(mp
, bno
+ count
);
597 if (size
> dp
->i_d
.di_size
) {
598 dp
->i_d
.di_size
= size
;
599 xfs_trans_log_inode(args
->trans
, dp
, XFS_ILOG_CORE
);
606 * See if the directory is a single-block form directory.
612 int *vp
) /* out: 1 is block, 0 is not block */
614 xfs_fileoff_t last
; /* last file offset */
619 if ((rval
= xfs_bmap_last_offset(tp
, dp
, &last
, XFS_DATA_FORK
)))
621 rval
= XFS_FSB_TO_B(mp
, last
) == mp
->m_dirblksize
;
622 ASSERT(rval
== 0 || dp
->i_d
.di_size
== mp
->m_dirblksize
);
628 * See if the directory is a single-leaf form directory.
634 int *vp
) /* out: 1 is leaf, 0 is not leaf */
636 xfs_fileoff_t last
; /* last file offset */
641 if ((rval
= xfs_bmap_last_offset(tp
, dp
, &last
, XFS_DATA_FORK
)))
643 *vp
= last
== mp
->m_dirleafblk
+ (1 << mp
->m_sb
.sb_dirblklog
);
648 * Remove the given block from the directory.
649 * This routine is used for data and free blocks, leaf/node are done
650 * by xfs_da_shrink_inode.
653 xfs_dir2_shrink_inode(
658 xfs_fileoff_t bno
; /* directory file offset */
659 xfs_dablk_t da
; /* directory file offset */
660 int done
; /* bunmap is finished */
666 trace_xfs_dir2_shrink_inode(args
, db
);
671 da
= xfs_dir2_db_to_da(mp
, db
);
673 * Unmap the fsblock(s).
675 if ((error
= xfs_bunmapi(tp
, dp
, da
, mp
->m_dirblkfsbs
,
676 XFS_BMAPI_METADATA
, 0, args
->firstblock
, args
->flist
,
679 * ENOSPC actually can happen if we're in a removename with
680 * no space reservation, and the resulting block removal
681 * would cause a bmap btree split or conversion from extents
682 * to btree. This can only happen for un-fragmented
683 * directory blocks, since you need to be punching out
684 * the middle of an extent.
685 * In this case we need to leave the block in the file,
687 * So the block has to be in a consistent empty state
688 * and appropriately logged.
689 * We don't free up the buffer, the caller can tell it
690 * hasn't happened since it got an error back.
696 * Invalidate the buffer from the transaction.
698 xfs_trans_binval(tp
, bp
);
700 * If it's not a data block, we're done.
702 if (db
>= XFS_DIR2_LEAF_FIRSTDB(mp
))
705 * If the block isn't the last one in the directory, we're done.
707 if (dp
->i_d
.di_size
> xfs_dir2_db_off_to_byte(mp
, db
+ 1, 0))
710 if ((error
= xfs_bmap_last_before(tp
, dp
, &bno
, XFS_DATA_FORK
))) {
712 * This can't really happen unless there's kernel corruption.
716 if (db
== mp
->m_dirdatablk
)
721 * Set the size to the new last block.
723 dp
->i_d
.di_size
= XFS_FSB_TO_B(mp
, bno
);
724 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);