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
18 #include "libxfs_priv.h"
20 #include "xfs_format.h"
21 #include "xfs_log_format.h"
22 #include "xfs_trans_resv.h"
23 #include "xfs_mount.h"
24 #include "xfs_defer.h"
25 #include "xfs_da_format.h"
26 #include "xfs_da_btree.h"
27 #include "xfs_inode.h"
28 #include "xfs_trans.h"
31 #include "xfs_dir2_priv.h"
32 #include "xfs_ialloc.h"
33 #include "xfs_trace.h"
35 struct xfs_name xfs_name_dotdot
= { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR
};
38 * Convert inode mode to directory entry filetype
44 switch (mode
& S_IFMT
) {
46 return XFS_DIR3_FT_REG_FILE
;
48 return XFS_DIR3_FT_DIR
;
50 return XFS_DIR3_FT_CHRDEV
;
52 return XFS_DIR3_FT_BLKDEV
;
54 return XFS_DIR3_FT_FIFO
;
56 return XFS_DIR3_FT_SOCK
;
58 return XFS_DIR3_FT_SYMLINK
;
60 return XFS_DIR3_FT_UNKNOWN
;
65 * ASCII case-insensitive (ie. A-Z) support for directories that was
69 xfs_ascii_ci_hashname(
70 struct xfs_name
*name
)
75 for (i
= 0, hash
= 0; i
< name
->len
; i
++)
76 hash
= tolower(name
->name
[i
]) ^ rol32(hash
, 7);
82 xfs_ascii_ci_compname(
83 struct xfs_da_args
*args
,
84 const unsigned char *name
,
87 enum xfs_dacmp result
;
90 if (args
->namelen
!= len
)
91 return XFS_CMP_DIFFERENT
;
93 result
= XFS_CMP_EXACT
;
94 for (i
= 0; i
< len
; i
++) {
95 if (args
->name
[i
] == name
[i
])
97 if (tolower(args
->name
[i
]) != tolower(name
[i
]))
98 return XFS_CMP_DIFFERENT
;
99 result
= XFS_CMP_CASE
;
105 static const struct xfs_nameops xfs_ascii_ci_nameops
= {
106 .hashname
= xfs_ascii_ci_hashname
,
107 .compname
= xfs_ascii_ci_compname
,
112 struct xfs_mount
*mp
)
114 struct xfs_da_geometry
*dageo
;
118 ASSERT(mp
->m_sb
.sb_versionnum
& XFS_SB_VERSION_DIRV2BIT
);
119 ASSERT((1 << (mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
)) <=
122 mp
->m_dir_inode_ops
= xfs_dir_get_ops(mp
, NULL
);
123 mp
->m_nondir_inode_ops
= xfs_nondir_get_ops(mp
, NULL
);
125 nodehdr_size
= mp
->m_dir_inode_ops
->node_hdr_size
;
126 mp
->m_dir_geo
= kmem_zalloc(sizeof(struct xfs_da_geometry
),
127 KM_SLEEP
| KM_MAYFAIL
);
128 mp
->m_attr_geo
= kmem_zalloc(sizeof(struct xfs_da_geometry
),
129 KM_SLEEP
| KM_MAYFAIL
);
130 if (!mp
->m_dir_geo
|| !mp
->m_attr_geo
) {
131 kmem_free(mp
->m_dir_geo
);
132 kmem_free(mp
->m_attr_geo
);
136 /* set up directory geometry */
137 dageo
= mp
->m_dir_geo
;
138 dageo
->blklog
= mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
;
139 dageo
->fsblog
= mp
->m_sb
.sb_blocklog
;
140 dageo
->blksize
= 1 << dageo
->blklog
;
141 dageo
->fsbcount
= 1 << mp
->m_sb
.sb_dirblklog
;
144 * Now we've set up the block conversion variables, we can calculate the
145 * segment block constants using the geometry structure.
147 dageo
->datablk
= xfs_dir2_byte_to_da(dageo
, XFS_DIR2_DATA_OFFSET
);
148 dageo
->leafblk
= xfs_dir2_byte_to_da(dageo
, XFS_DIR2_LEAF_OFFSET
);
149 dageo
->freeblk
= xfs_dir2_byte_to_da(dageo
, XFS_DIR2_FREE_OFFSET
);
150 dageo
->node_ents
= (dageo
->blksize
- nodehdr_size
) /
151 (uint
)sizeof(xfs_da_node_entry_t
);
152 dageo
->magicpct
= (dageo
->blksize
* 37) / 100;
154 /* set up attribute geometry - single fsb only */
155 dageo
= mp
->m_attr_geo
;
156 dageo
->blklog
= mp
->m_sb
.sb_blocklog
;
157 dageo
->fsblog
= mp
->m_sb
.sb_blocklog
;
158 dageo
->blksize
= 1 << dageo
->blklog
;
160 dageo
->node_ents
= (dageo
->blksize
- nodehdr_size
) /
161 (uint
)sizeof(xfs_da_node_entry_t
);
162 dageo
->magicpct
= (dageo
->blksize
* 37) / 100;
164 if (xfs_sb_version_hasasciici(&mp
->m_sb
))
165 mp
->m_dirnameops
= &xfs_ascii_ci_nameops
;
167 mp
->m_dirnameops
= &xfs_default_nameops
;
174 struct xfs_mount
*mp
)
176 kmem_free(mp
->m_dir_geo
);
177 kmem_free(mp
->m_attr_geo
);
181 * Return 1 if directory contains only "." and "..".
187 xfs_dir2_sf_hdr_t
*sfp
;
189 ASSERT(S_ISDIR(VFS_I(dp
)->i_mode
));
190 if (dp
->i_d
.di_size
== 0) /* might happen during shutdown. */
192 if (dp
->i_d
.di_size
> XFS_IFORK_DSIZE(dp
))
194 sfp
= (xfs_dir2_sf_hdr_t
*)dp
->i_df
.if_u1
.if_data
;
199 * Validate a given inode number.
202 xfs_dir_ino_validate(
206 bool ino_ok
= xfs_verify_dir_ino(mp
, ino
);
208 if (unlikely(XFS_TEST_ERROR(!ino_ok
, mp
, XFS_ERRTAG_DIR_INO_VALIDATE
))) {
209 xfs_warn(mp
, "Invalid inode number 0x%Lx",
210 (unsigned long long) ino
);
211 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW
, mp
);
212 return -EFSCORRUPTED
;
218 * Initialize a directory with its "." and ".." entries.
226 struct xfs_da_args
*args
;
229 ASSERT(S_ISDIR(VFS_I(dp
)->i_mode
));
230 error
= xfs_dir_ino_validate(tp
->t_mountp
, pdp
->i_ino
);
234 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
238 args
->geo
= dp
->i_mount
->m_dir_geo
;
241 error
= xfs_dir2_sf_create(args
, pdp
->i_ino
);
247 * Enter a name in a directory, or check for available space.
248 * If inum is 0, only the available space test is performed.
254 struct xfs_name
*name
,
255 xfs_ino_t inum
, /* new entry inode number */
256 xfs_fsblock_t
*first
, /* bmap's firstblock */
257 struct xfs_defer_ops
*dfops
, /* bmap's freeblock list */
258 xfs_extlen_t total
) /* bmap's total block count */
260 struct xfs_da_args
*args
;
262 int v
; /* type-checking value */
264 ASSERT(S_ISDIR(VFS_I(dp
)->i_mode
));
266 rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
);
269 XFS_STATS_INC(dp
->i_mount
, xs_dir_create
);
272 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
276 args
->geo
= dp
->i_mount
->m_dir_geo
;
277 args
->name
= name
->name
;
278 args
->namelen
= name
->len
;
279 args
->filetype
= name
->type
;
280 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
281 args
->inumber
= inum
;
283 args
->firstblock
= first
;
286 args
->whichfork
= XFS_DATA_FORK
;
288 args
->op_flags
= XFS_DA_OP_ADDNAME
| XFS_DA_OP_OKNOENT
;
290 args
->op_flags
|= XFS_DA_OP_JUSTCHECK
;
292 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
293 rval
= xfs_dir2_sf_addname(args
);
297 rval
= xfs_dir2_isblock(args
, &v
);
301 rval
= xfs_dir2_block_addname(args
);
305 rval
= xfs_dir2_isleaf(args
, &v
);
309 rval
= xfs_dir2_leaf_addname(args
);
311 rval
= xfs_dir2_node_addname(args
);
319 * If doing a CI lookup and case-insensitive match, dup actual name into
320 * args.value. Return EEXIST for success (ie. name found) or an error.
323 xfs_dir_cilookup_result(
324 struct xfs_da_args
*args
,
325 const unsigned char *name
,
328 if (args
->cmpresult
== XFS_CMP_DIFFERENT
)
330 if (args
->cmpresult
!= XFS_CMP_CASE
||
331 !(args
->op_flags
& XFS_DA_OP_CILOOKUP
))
334 args
->value
= kmem_alloc(len
, KM_NOFS
| KM_MAYFAIL
);
338 memcpy(args
->value
, name
, len
);
339 args
->valuelen
= len
;
344 * Lookup a name in a directory, give back the inode number.
345 * If ci_name is not NULL, returns the actual name in ci_name if it differs
346 * to name, or ci_name->name is set to NULL for an exact match.
353 struct xfs_name
*name
,
354 xfs_ino_t
*inum
, /* out: inode number */
355 struct xfs_name
*ci_name
) /* out: actual name if CI match */
357 struct xfs_da_args
*args
;
359 int v
; /* type-checking value */
362 ASSERT(S_ISDIR(VFS_I(dp
)->i_mode
));
363 XFS_STATS_INC(dp
->i_mount
, xs_dir_lookup
);
366 * We need to use KM_NOFS here so that lockdep will not throw false
367 * positive deadlock warnings on a non-transactional lookup path. It is
368 * safe to recurse into inode recalim in that case, but lockdep can't
369 * easily be taught about it. Hence KM_NOFS avoids having to add more
370 * lockdep Doing this avoids having to add a bunch of lockdep class
371 * annotations into the reclaim path for the ilock.
373 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
374 args
->geo
= dp
->i_mount
->m_dir_geo
;
375 args
->name
= name
->name
;
376 args
->namelen
= name
->len
;
377 args
->filetype
= name
->type
;
378 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
380 args
->whichfork
= XFS_DATA_FORK
;
382 args
->op_flags
= XFS_DA_OP_OKNOENT
;
384 args
->op_flags
|= XFS_DA_OP_CILOOKUP
;
386 lock_mode
= xfs_ilock_data_map_shared(dp
);
387 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
388 rval
= xfs_dir2_sf_lookup(args
);
392 rval
= xfs_dir2_isblock(args
, &v
);
396 rval
= xfs_dir2_block_lookup(args
);
400 rval
= xfs_dir2_isleaf(args
, &v
);
404 rval
= xfs_dir2_leaf_lookup(args
);
406 rval
= xfs_dir2_node_lookup(args
);
412 *inum
= args
->inumber
;
414 ci_name
->name
= args
->value
;
415 ci_name
->len
= args
->valuelen
;
419 xfs_iunlock(dp
, lock_mode
);
425 * Remove an entry from a directory.
431 struct xfs_name
*name
,
433 xfs_fsblock_t
*first
, /* bmap's firstblock */
434 struct xfs_defer_ops
*dfops
, /* bmap's freeblock list */
435 xfs_extlen_t total
) /* bmap's total block count */
437 struct xfs_da_args
*args
;
439 int v
; /* type-checking value */
441 ASSERT(S_ISDIR(VFS_I(dp
)->i_mode
));
442 XFS_STATS_INC(dp
->i_mount
, xs_dir_remove
);
444 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
448 args
->geo
= dp
->i_mount
->m_dir_geo
;
449 args
->name
= name
->name
;
450 args
->namelen
= name
->len
;
451 args
->filetype
= name
->type
;
452 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
455 args
->firstblock
= first
;
458 args
->whichfork
= XFS_DATA_FORK
;
461 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
462 rval
= xfs_dir2_sf_removename(args
);
466 rval
= xfs_dir2_isblock(args
, &v
);
470 rval
= xfs_dir2_block_removename(args
);
474 rval
= xfs_dir2_isleaf(args
, &v
);
478 rval
= xfs_dir2_leaf_removename(args
);
480 rval
= xfs_dir2_node_removename(args
);
487 * Replace the inode number of a directory entry.
493 struct xfs_name
*name
, /* name of entry to replace */
494 xfs_ino_t inum
, /* new inode number */
495 xfs_fsblock_t
*first
, /* bmap's firstblock */
496 struct xfs_defer_ops
*dfops
, /* bmap's freeblock list */
497 xfs_extlen_t total
) /* bmap's total block count */
499 struct xfs_da_args
*args
;
501 int v
; /* type-checking value */
503 ASSERT(S_ISDIR(VFS_I(dp
)->i_mode
));
505 rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
);
509 args
= kmem_zalloc(sizeof(*args
), KM_SLEEP
| KM_NOFS
);
513 args
->geo
= dp
->i_mount
->m_dir_geo
;
514 args
->name
= name
->name
;
515 args
->namelen
= name
->len
;
516 args
->filetype
= name
->type
;
517 args
->hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
518 args
->inumber
= inum
;
520 args
->firstblock
= first
;
523 args
->whichfork
= XFS_DATA_FORK
;
526 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
) {
527 rval
= xfs_dir2_sf_replace(args
);
531 rval
= xfs_dir2_isblock(args
, &v
);
535 rval
= xfs_dir2_block_replace(args
);
539 rval
= xfs_dir2_isleaf(args
, &v
);
543 rval
= xfs_dir2_leaf_replace(args
);
545 rval
= xfs_dir2_node_replace(args
);
552 * See if this entry can be added to the directory without allocating space.
558 struct xfs_name
*name
) /* name of entry to add */
560 return xfs_dir_createname(tp
, dp
, name
, 0, NULL
, NULL
, 0);
568 * Add a block to the directory.
570 * This routine is for data and free blocks, not leaf/node blocks which are
571 * handled by xfs_da_grow_inode.
575 struct xfs_da_args
*args
,
576 int space
, /* v2 dir's space XFS_DIR2_xxx_SPACE */
577 xfs_dir2_db_t
*dbp
) /* out: block number added */
579 struct xfs_inode
*dp
= args
->dp
;
580 struct xfs_mount
*mp
= dp
->i_mount
;
581 xfs_fileoff_t bno
; /* directory offset of new block */
582 int count
; /* count of filesystem blocks */
585 trace_xfs_dir2_grow_inode(args
, space
);
588 * Set lowest possible block in the space requested.
590 bno
= XFS_B_TO_FSBT(mp
, space
* XFS_DIR2_SPACE_SIZE
);
591 count
= args
->geo
->fsbcount
;
593 error
= xfs_da_grow_inode_int(args
, &bno
, count
);
597 *dbp
= xfs_dir2_da_to_db(args
->geo
, (xfs_dablk_t
)bno
);
600 * Update file's size if this is the data space and it grew.
602 if (space
== XFS_DIR2_DATA_SPACE
) {
603 xfs_fsize_t size
; /* directory file (data) size */
605 size
= XFS_FSB_TO_B(mp
, bno
+ count
);
606 if (size
> dp
->i_d
.di_size
) {
607 dp
->i_d
.di_size
= size
;
608 xfs_trans_log_inode(args
->trans
, dp
, XFS_ILOG_CORE
);
615 * See if the directory is a single-block form directory.
619 struct xfs_da_args
*args
,
620 int *vp
) /* out: 1 is block, 0 is not block */
622 xfs_fileoff_t last
; /* last file offset */
625 if ((rval
= xfs_bmap_last_offset(args
->dp
, &last
, XFS_DATA_FORK
)))
627 rval
= XFS_FSB_TO_B(args
->dp
->i_mount
, last
) == args
->geo
->blksize
;
628 if (rval
!= 0 && args
->dp
->i_d
.di_size
!= args
->geo
->blksize
)
629 return -EFSCORRUPTED
;
635 * See if the directory is a single-leaf form directory.
639 struct xfs_da_args
*args
,
640 int *vp
) /* out: 1 is block, 0 is not block */
642 xfs_fileoff_t last
; /* last file offset */
645 if ((rval
= xfs_bmap_last_offset(args
->dp
, &last
, XFS_DATA_FORK
)))
647 *vp
= last
== args
->geo
->leafblk
+ args
->geo
->fsbcount
;
652 * Remove the given block from the directory.
653 * This routine is used for data and free blocks, leaf/node are done
654 * by xfs_da_shrink_inode.
657 xfs_dir2_shrink_inode(
662 xfs_fileoff_t bno
; /* directory file offset */
663 xfs_dablk_t da
; /* directory file offset */
664 int done
; /* bunmap is finished */
670 trace_xfs_dir2_shrink_inode(args
, db
);
675 da
= xfs_dir2_db_to_da(args
->geo
, db
);
677 /* Unmap the fsblock(s). */
678 error
= xfs_bunmapi(tp
, dp
, da
, args
->geo
->fsbcount
, 0, 0,
679 args
->firstblock
, args
->dfops
, &done
);
682 * ENOSPC actually can happen if we're in a removename with no
683 * space reservation, and the resulting block removal would
684 * cause a bmap btree split or conversion from extents to btree.
685 * This can only happen for un-fragmented directory blocks,
686 * since you need to be punching out the middle of an extent.
687 * In this case we need to leave the block in the file, and not
688 * binval it. So the block has to be in a consistent empty
689 * state and appropriately logged. We don't free up the buffer,
690 * the caller can tell it hasn't happened since it got an error
697 * Invalidate the buffer from the transaction.
699 xfs_trans_binval(tp
, bp
);
701 * If it's not a data block, we're done.
703 if (db
>= xfs_dir2_byte_to_db(args
->geo
, XFS_DIR2_LEAF_OFFSET
))
706 * If the block isn't the last one in the directory, we're done.
708 if (dp
->i_d
.di_size
> xfs_dir2_db_off_to_byte(args
->geo
, db
+ 1, 0))
711 if ((error
= xfs_bmap_last_before(tp
, dp
, &bno
, XFS_DATA_FORK
))) {
713 * This can't really happen unless there's kernel corruption.
717 if (db
== args
->geo
->datablk
)
722 * Set the size to the new last block.
724 dp
->i_d
.di_size
= XFS_FSB_TO_B(mp
, bno
);
725 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);