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 XFS_ERROR(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);