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_types.h"
23 #include "xfs_trans.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_btree.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_dinode.h"
31 #include "xfs_inode.h"
32 #include "xfs_inode_item.h"
35 #include "xfs_dir2_format.h"
36 #include "xfs_dir2_priv.h"
37 #include "xfs_error.h"
38 #include "xfs_vnodeops.h"
39 #include "xfs_trace.h"
41 struct xfs_name xfs_name_dotdot
= { (unsigned char *)"..", 2};
44 * ASCII case-insensitive (ie. A-Z) support for directories that was
48 xfs_ascii_ci_hashname(
49 struct xfs_name
*name
)
54 for (i
= 0, hash
= 0; i
< name
->len
; i
++)
55 hash
= tolower(name
->name
[i
]) ^ rol32(hash
, 7);
61 xfs_ascii_ci_compname(
62 struct xfs_da_args
*args
,
63 const unsigned char *name
,
66 enum xfs_dacmp result
;
69 if (args
->namelen
!= len
)
70 return XFS_CMP_DIFFERENT
;
72 result
= XFS_CMP_EXACT
;
73 for (i
= 0; i
< len
; i
++) {
74 if (args
->name
[i
] == name
[i
])
76 if (tolower(args
->name
[i
]) != tolower(name
[i
]))
77 return XFS_CMP_DIFFERENT
;
78 result
= XFS_CMP_CASE
;
84 static struct xfs_nameops xfs_ascii_ci_nameops
= {
85 .hashname
= xfs_ascii_ci_hashname
,
86 .compname
= xfs_ascii_ci_compname
,
93 ASSERT(xfs_sb_version_hasdirv2(&mp
->m_sb
));
94 ASSERT((1 << (mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
)) <=
96 mp
->m_dirblksize
= 1 << (mp
->m_sb
.sb_blocklog
+ mp
->m_sb
.sb_dirblklog
);
97 mp
->m_dirblkfsbs
= 1 << mp
->m_sb
.sb_dirblklog
;
98 mp
->m_dirdatablk
= xfs_dir2_db_to_da(mp
, XFS_DIR2_DATA_FIRSTDB(mp
));
99 mp
->m_dirleafblk
= xfs_dir2_db_to_da(mp
, XFS_DIR2_LEAF_FIRSTDB(mp
));
100 mp
->m_dirfreeblk
= xfs_dir2_db_to_da(mp
, XFS_DIR2_FREE_FIRSTDB(mp
));
101 mp
->m_attr_node_ents
=
102 (mp
->m_sb
.sb_blocksize
- (uint
)sizeof(xfs_da_node_hdr_t
)) /
103 (uint
)sizeof(xfs_da_node_entry_t
);
104 mp
->m_dir_node_ents
=
105 (mp
->m_dirblksize
- (uint
)sizeof(xfs_da_node_hdr_t
)) /
106 (uint
)sizeof(xfs_da_node_entry_t
);
107 mp
->m_dir_magicpct
= (mp
->m_dirblksize
* 37) / 100;
108 if (xfs_sb_version_hasasciici(&mp
->m_sb
))
109 mp
->m_dirnameops
= &xfs_ascii_ci_nameops
;
111 mp
->m_dirnameops
= &xfs_default_nameops
;
115 * Return 1 if directory contains only "." and "..".
121 xfs_dir2_sf_hdr_t
*sfp
;
123 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
124 if (dp
->i_d
.di_size
== 0) /* might happen during shutdown. */
126 if (dp
->i_d
.di_size
> XFS_IFORK_DSIZE(dp
))
128 sfp
= (xfs_dir2_sf_hdr_t
*)dp
->i_df
.if_u1
.if_data
;
133 * Validate a given inode number.
136 xfs_dir_ino_validate(
140 xfs_agblock_t agblkno
;
146 agno
= XFS_INO_TO_AGNO(mp
, ino
);
147 agblkno
= XFS_INO_TO_AGBNO(mp
, ino
);
148 ioff
= XFS_INO_TO_OFFSET(mp
, ino
);
149 agino
= XFS_OFFBNO_TO_AGINO(mp
, agblkno
, ioff
);
151 agno
< mp
->m_sb
.sb_agcount
&&
152 agblkno
< mp
->m_sb
.sb_agblocks
&&
154 ioff
< (1 << mp
->m_sb
.sb_inopblog
) &&
155 XFS_AGINO_TO_INO(mp
, agno
, agino
) == ino
;
156 if (unlikely(XFS_TEST_ERROR(!ino_ok
, mp
, XFS_ERRTAG_DIR_INO_VALIDATE
,
157 XFS_RANDOM_DIR_INO_VALIDATE
))) {
158 xfs_warn(mp
, "Invalid inode number 0x%Lx",
159 (unsigned long long) ino
);
160 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW
, mp
);
161 return XFS_ERROR(EFSCORRUPTED
);
167 * Initialize a directory with its "." and ".." entries.
178 memset((char *)&args
, 0, sizeof(args
));
181 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
182 if ((error
= xfs_dir_ino_validate(tp
->t_mountp
, pdp
->i_ino
)))
184 return xfs_dir2_sf_create(&args
, pdp
->i_ino
);
188 Enter a name in a directory.
194 struct xfs_name
*name
,
195 xfs_ino_t inum
, /* new entry inode number */
196 xfs_fsblock_t
*first
, /* bmap's firstblock */
197 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
198 xfs_extlen_t total
) /* bmap's total block count */
202 int v
; /* type-checking value */
204 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
205 if ((rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
)))
207 XFS_STATS_INC(xs_dir_create
);
209 memset(&args
, 0, sizeof(xfs_da_args_t
));
210 args
.name
= name
->name
;
211 args
.namelen
= name
->len
;
212 args
.hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
215 args
.firstblock
= first
;
218 args
.whichfork
= XFS_DATA_FORK
;
220 args
.op_flags
= XFS_DA_OP_ADDNAME
| XFS_DA_OP_OKNOENT
;
222 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
223 rval
= xfs_dir2_sf_addname(&args
);
224 else if ((rval
= xfs_dir2_isblock(tp
, dp
, &v
)))
227 rval
= xfs_dir2_block_addname(&args
);
228 else if ((rval
= xfs_dir2_isleaf(tp
, dp
, &v
)))
231 rval
= xfs_dir2_leaf_addname(&args
);
233 rval
= xfs_dir2_node_addname(&args
);
238 * If doing a CI lookup and case-insensitive match, dup actual name into
239 * args.value. Return EEXIST for success (ie. name found) or an error.
242 xfs_dir_cilookup_result(
243 struct xfs_da_args
*args
,
244 const unsigned char *name
,
247 if (args
->cmpresult
== XFS_CMP_DIFFERENT
)
249 if (args
->cmpresult
!= XFS_CMP_CASE
||
250 !(args
->op_flags
& XFS_DA_OP_CILOOKUP
))
253 args
->value
= kmem_alloc(len
, KM_NOFS
| KM_MAYFAIL
);
257 memcpy(args
->value
, name
, len
);
258 args
->valuelen
= len
;
263 * Lookup a name in a directory, give back the inode number.
264 * If ci_name is not NULL, returns the actual name in ci_name if it differs
265 * to name, or ci_name->name is set to NULL for an exact match.
272 struct xfs_name
*name
,
273 xfs_ino_t
*inum
, /* out: inode number */
274 struct xfs_name
*ci_name
) /* out: actual name if CI match */
278 int v
; /* type-checking value */
280 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
281 XFS_STATS_INC(xs_dir_lookup
);
283 memset(&args
, 0, sizeof(xfs_da_args_t
));
284 args
.name
= name
->name
;
285 args
.namelen
= name
->len
;
286 args
.hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
288 args
.whichfork
= XFS_DATA_FORK
;
290 args
.op_flags
= XFS_DA_OP_OKNOENT
;
292 args
.op_flags
|= XFS_DA_OP_CILOOKUP
;
294 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
295 rval
= xfs_dir2_sf_lookup(&args
);
296 else if ((rval
= xfs_dir2_isblock(tp
, dp
, &v
)))
299 rval
= xfs_dir2_block_lookup(&args
);
300 else if ((rval
= xfs_dir2_isleaf(tp
, dp
, &v
)))
303 rval
= xfs_dir2_leaf_lookup(&args
);
305 rval
= xfs_dir2_node_lookup(&args
);
309 *inum
= args
.inumber
;
311 ci_name
->name
= args
.value
;
312 ci_name
->len
= args
.valuelen
;
319 * Remove an entry from a directory.
325 struct xfs_name
*name
,
327 xfs_fsblock_t
*first
, /* bmap's firstblock */
328 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
329 xfs_extlen_t total
) /* bmap's total block count */
333 int v
; /* type-checking value */
335 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
336 XFS_STATS_INC(xs_dir_remove
);
338 memset(&args
, 0, sizeof(xfs_da_args_t
));
339 args
.name
= name
->name
;
340 args
.namelen
= name
->len
;
341 args
.hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
344 args
.firstblock
= first
;
347 args
.whichfork
= XFS_DATA_FORK
;
350 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
351 rval
= xfs_dir2_sf_removename(&args
);
352 else if ((rval
= xfs_dir2_isblock(tp
, dp
, &v
)))
355 rval
= xfs_dir2_block_removename(&args
);
356 else if ((rval
= xfs_dir2_isleaf(tp
, dp
, &v
)))
359 rval
= xfs_dir2_leaf_removename(&args
);
361 rval
= xfs_dir2_node_removename(&args
);
371 struct dir_context
*ctx
,
374 int rval
; /* return value */
375 int v
; /* type-checking value */
377 trace_xfs_readdir(dp
);
379 if (XFS_FORCED_SHUTDOWN(dp
->i_mount
))
380 return XFS_ERROR(EIO
);
382 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
383 XFS_STATS_INC(xs_dir_getdents
);
385 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
386 rval
= xfs_dir2_sf_getdents(dp
, ctx
);
387 else if ((rval
= xfs_dir2_isblock(NULL
, dp
, &v
)))
390 rval
= xfs_dir2_block_getdents(dp
, ctx
);
392 rval
= xfs_dir2_leaf_getdents(dp
, ctx
, bufsize
);
397 * Replace the inode number of a directory entry.
403 struct xfs_name
*name
, /* name of entry to replace */
404 xfs_ino_t inum
, /* new inode number */
405 xfs_fsblock_t
*first
, /* bmap's firstblock */
406 xfs_bmap_free_t
*flist
, /* bmap's freeblock list */
407 xfs_extlen_t total
) /* bmap's total block count */
411 int v
; /* type-checking value */
413 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
415 if ((rval
= xfs_dir_ino_validate(tp
->t_mountp
, inum
)))
418 memset(&args
, 0, sizeof(xfs_da_args_t
));
419 args
.name
= name
->name
;
420 args
.namelen
= name
->len
;
421 args
.hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
424 args
.firstblock
= first
;
427 args
.whichfork
= XFS_DATA_FORK
;
430 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
431 rval
= xfs_dir2_sf_replace(&args
);
432 else if ((rval
= xfs_dir2_isblock(tp
, dp
, &v
)))
435 rval
= xfs_dir2_block_replace(&args
);
436 else if ((rval
= xfs_dir2_isleaf(tp
, dp
, &v
)))
439 rval
= xfs_dir2_leaf_replace(&args
);
441 rval
= xfs_dir2_node_replace(&args
);
446 * See if this entry can be added to the directory without allocating space.
447 * First checks that the caller couldn't reserve enough space (resblks = 0).
453 struct xfs_name
*name
, /* name of entry to add */
458 int v
; /* type-checking value */
463 ASSERT(S_ISDIR(dp
->i_d
.di_mode
));
465 memset(&args
, 0, sizeof(xfs_da_args_t
));
466 args
.name
= name
->name
;
467 args
.namelen
= name
->len
;
468 args
.hashval
= dp
->i_mount
->m_dirnameops
->hashname(name
);
470 args
.whichfork
= XFS_DATA_FORK
;
472 args
.op_flags
= XFS_DA_OP_JUSTCHECK
| XFS_DA_OP_ADDNAME
|
475 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
476 rval
= xfs_dir2_sf_addname(&args
);
477 else if ((rval
= xfs_dir2_isblock(tp
, dp
, &v
)))
480 rval
= xfs_dir2_block_addname(&args
);
481 else if ((rval
= xfs_dir2_isleaf(tp
, dp
, &v
)))
484 rval
= xfs_dir2_leaf_addname(&args
);
486 rval
= xfs_dir2_node_addname(&args
);
495 * Add a block to the directory.
497 * This routine is for data and free blocks, not leaf/node blocks which are
498 * handled by xfs_da_grow_inode.
502 struct xfs_da_args
*args
,
503 int space
, /* v2 dir's space XFS_DIR2_xxx_SPACE */
504 xfs_dir2_db_t
*dbp
) /* out: block number added */
506 struct xfs_inode
*dp
= args
->dp
;
507 struct xfs_mount
*mp
= dp
->i_mount
;
508 xfs_fileoff_t bno
; /* directory offset of new block */
509 int count
; /* count of filesystem blocks */
512 trace_xfs_dir2_grow_inode(args
, space
);
515 * Set lowest possible block in the space requested.
517 bno
= XFS_B_TO_FSBT(mp
, space
* XFS_DIR2_SPACE_SIZE
);
518 count
= mp
->m_dirblkfsbs
;
520 error
= xfs_da_grow_inode_int(args
, &bno
, count
);
524 *dbp
= xfs_dir2_da_to_db(mp
, (xfs_dablk_t
)bno
);
527 * Update file's size if this is the data space and it grew.
529 if (space
== XFS_DIR2_DATA_SPACE
) {
530 xfs_fsize_t size
; /* directory file (data) size */
532 size
= XFS_FSB_TO_B(mp
, bno
+ count
);
533 if (size
> dp
->i_d
.di_size
) {
534 dp
->i_d
.di_size
= size
;
535 xfs_trans_log_inode(args
->trans
, dp
, XFS_ILOG_CORE
);
542 * See if the directory is a single-block form directory.
548 int *vp
) /* out: 1 is block, 0 is not block */
550 xfs_fileoff_t last
; /* last file offset */
555 if ((rval
= xfs_bmap_last_offset(tp
, dp
, &last
, XFS_DATA_FORK
)))
557 rval
= XFS_FSB_TO_B(mp
, last
) == mp
->m_dirblksize
;
558 ASSERT(rval
== 0 || dp
->i_d
.di_size
== mp
->m_dirblksize
);
564 * See if the directory is a single-leaf form directory.
570 int *vp
) /* out: 1 is leaf, 0 is not leaf */
572 xfs_fileoff_t last
; /* last file offset */
577 if ((rval
= xfs_bmap_last_offset(tp
, dp
, &last
, XFS_DATA_FORK
)))
579 *vp
= last
== mp
->m_dirleafblk
+ (1 << mp
->m_sb
.sb_dirblklog
);
584 * Remove the given block from the directory.
585 * This routine is used for data and free blocks, leaf/node are done
586 * by xfs_da_shrink_inode.
589 xfs_dir2_shrink_inode(
594 xfs_fileoff_t bno
; /* directory file offset */
595 xfs_dablk_t da
; /* directory file offset */
596 int done
; /* bunmap is finished */
602 trace_xfs_dir2_shrink_inode(args
, db
);
607 da
= xfs_dir2_db_to_da(mp
, db
);
609 * Unmap the fsblock(s).
611 if ((error
= xfs_bunmapi(tp
, dp
, da
, mp
->m_dirblkfsbs
,
612 XFS_BMAPI_METADATA
, 0, args
->firstblock
, args
->flist
,
615 * ENOSPC actually can happen if we're in a removename with
616 * no space reservation, and the resulting block removal
617 * would cause a bmap btree split or conversion from extents
618 * to btree. This can only happen for un-fragmented
619 * directory blocks, since you need to be punching out
620 * the middle of an extent.
621 * In this case we need to leave the block in the file,
623 * So the block has to be in a consistent empty state
624 * and appropriately logged.
625 * We don't free up the buffer, the caller can tell it
626 * hasn't happened since it got an error back.
632 * Invalidate the buffer from the transaction.
634 xfs_trans_binval(tp
, bp
);
636 * If it's not a data block, we're done.
638 if (db
>= XFS_DIR2_LEAF_FIRSTDB(mp
))
641 * If the block isn't the last one in the directory, we're done.
643 if (dp
->i_d
.di_size
> xfs_dir2_db_off_to_byte(mp
, db
+ 1, 0))
646 if ((error
= xfs_bmap_last_before(tp
, dp
, &bno
, XFS_DATA_FORK
))) {
648 * This can't really happen unless there's kernel corruption.
652 if (db
== mp
->m_dirdatablk
)
657 * Set the size to the new last block.
659 dp
->i_d
.di_size
= XFS_FSB_TO_B(mp
, bno
);
660 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);