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);