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(xfs_sb_version_hasdirv2(&mp->m_sb));
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;
147 /* XXX: these are to be removed as code is converted to use geo */
148 mp->m_dirblksize = mp->m_dir_geo->blksize;
149 mp->m_dir_node_ents = mp->m_dir_geo->node_ents;
150 mp->m_dir_magicpct = mp->m_dir_geo->magicpct;
151 mp->m_attr_node_ents = mp->m_attr_geo->node_ents;
152 mp->m_attr_magicpct = mp->m_attr_geo->magicpct;
158 struct xfs_mount *mp)
160 kmem_free(mp->m_dir_geo);
161 kmem_free(mp->m_attr_geo);
165 * Return 1 if directory contains only "." and "..".
171 xfs_dir2_sf_hdr_t *sfp;
173 ASSERT(S_ISDIR(dp->i_d.di_mode));
174 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
176 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
178 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
183 * Validate a given inode number.
186 xfs_dir_ino_validate(
190 xfs_agblock_t agblkno;
196 agno = XFS_INO_TO_AGNO(mp, ino);
197 agblkno = XFS_INO_TO_AGBNO(mp, ino);
198 ioff = XFS_INO_TO_OFFSET(mp, ino);
199 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
201 agno < mp->m_sb.sb_agcount &&
202 agblkno < mp->m_sb.sb_agblocks &&
204 ioff < (1 << mp->m_sb.sb_inopblog) &&
205 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
206 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
207 XFS_RANDOM_DIR_INO_VALIDATE))) {
208 xfs_warn(mp, "Invalid inode number 0x%Lx",
209 (unsigned long long) ino);
210 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
211 return XFS_ERROR(EFSCORRUPTED);
217 * Initialize a directory with its "." and ".." entries.
225 struct xfs_da_args *args;
228 ASSERT(S_ISDIR(dp->i_d.di_mode));
229 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
233 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
237 args->geo = dp->i_mount->m_dir_geo;
240 error = xfs_dir2_sf_create(args, pdp->i_ino);
246 Enter a name in a directory.
252 struct xfs_name *name,
253 xfs_ino_t inum, /* new entry inode number */
254 xfs_fsblock_t *first, /* bmap's firstblock */
255 xfs_bmap_free_t *flist, /* bmap's freeblock list */
256 xfs_extlen_t total) /* bmap's total block count */
258 struct xfs_da_args *args;
260 int v; /* type-checking value */
262 ASSERT(S_ISDIR(dp->i_d.di_mode));
263 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
266 XFS_STATS_INC(xs_dir_create);
268 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
272 args->geo = dp->i_mount->m_dir_geo;
273 args->name = name->name;
274 args->namelen = name->len;
275 args->filetype = name->type;
276 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
277 args->inumber = inum;
279 args->firstblock = first;
282 args->whichfork = XFS_DATA_FORK;
284 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
286 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
287 rval = xfs_dir2_sf_addname(args);
291 rval = xfs_dir2_isblock(dp, &v);
295 rval = xfs_dir2_block_addname(args);
299 rval = xfs_dir2_isleaf(dp, &v);
303 rval = xfs_dir2_leaf_addname(args);
305 rval = xfs_dir2_node_addname(args);
313 * If doing a CI lookup and case-insensitive match, dup actual name into
314 * args.value. Return EEXIST for success (ie. name found) or an error.
317 xfs_dir_cilookup_result(
318 struct xfs_da_args *args,
319 const unsigned char *name,
322 if (args->cmpresult == XFS_CMP_DIFFERENT)
324 if (args->cmpresult != XFS_CMP_CASE ||
325 !(args->op_flags & XFS_DA_OP_CILOOKUP))
328 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
332 memcpy(args->value, name, len);
333 args->valuelen = len;
338 * Lookup a name in a directory, give back the inode number.
339 * If ci_name is not NULL, returns the actual name in ci_name if it differs
340 * to name, or ci_name->name is set to NULL for an exact match.
347 struct xfs_name *name,
348 xfs_ino_t *inum, /* out: inode number */
349 struct xfs_name *ci_name) /* out: actual name if CI match */
351 struct xfs_da_args *args;
353 int v; /* type-checking value */
355 ASSERT(S_ISDIR(dp->i_d.di_mode));
356 XFS_STATS_INC(xs_dir_lookup);
359 * We need to use KM_NOFS here so that lockdep will not throw false
360 * positive deadlock warnings on a non-transactional lookup path. It is
361 * safe to recurse into inode recalim in that case, but lockdep can't
362 * easily be taught about it. Hence KM_NOFS avoids having to add more
363 * lockdep Doing this avoids having to add a bunch of lockdep class
364 * annotations into the reclaim path for the ilock.
366 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
367 args->geo = dp->i_mount->m_dir_geo;
368 args->name = name->name;
369 args->namelen = name->len;
370 args->filetype = name->type;
371 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
373 args->whichfork = XFS_DATA_FORK;
375 args->op_flags = XFS_DA_OP_OKNOENT;
377 args->op_flags |= XFS_DA_OP_CILOOKUP;
379 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
380 rval = xfs_dir2_sf_lookup(args);
384 rval = xfs_dir2_isblock(dp, &v);
388 rval = xfs_dir2_block_lookup(args);
392 rval = xfs_dir2_isleaf(dp, &v);
396 rval = xfs_dir2_leaf_lookup(args);
398 rval = xfs_dir2_node_lookup(args);
404 *inum = args->inumber;
406 ci_name->name = args->value;
407 ci_name->len = args->valuelen;
416 * Remove an entry from a directory.
422 struct xfs_name *name,
424 xfs_fsblock_t *first, /* bmap's firstblock */
425 xfs_bmap_free_t *flist, /* bmap's freeblock list */
426 xfs_extlen_t total) /* bmap's total block count */
428 struct xfs_da_args *args;
430 int v; /* type-checking value */
432 ASSERT(S_ISDIR(dp->i_d.di_mode));
433 XFS_STATS_INC(xs_dir_remove);
435 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
439 args->geo = dp->i_mount->m_dir_geo;
440 args->name = name->name;
441 args->namelen = name->len;
442 args->filetype = name->type;
443 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
446 args->firstblock = first;
449 args->whichfork = XFS_DATA_FORK;
452 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
453 rval = xfs_dir2_sf_removename(args);
457 rval = xfs_dir2_isblock(dp, &v);
461 rval = xfs_dir2_block_removename(args);
465 rval = xfs_dir2_isleaf(dp, &v);
469 rval = xfs_dir2_leaf_removename(args);
471 rval = xfs_dir2_node_removename(args);
478 * Replace the inode number of a directory entry.
484 struct xfs_name *name, /* name of entry to replace */
485 xfs_ino_t inum, /* new inode number */
486 xfs_fsblock_t *first, /* bmap's firstblock */
487 xfs_bmap_free_t *flist, /* bmap's freeblock list */
488 xfs_extlen_t total) /* bmap's total block count */
490 struct xfs_da_args *args;
492 int v; /* type-checking value */
494 ASSERT(S_ISDIR(dp->i_d.di_mode));
496 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
500 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
504 args->geo = dp->i_mount->m_dir_geo;
505 args->name = name->name;
506 args->namelen = name->len;
507 args->filetype = name->type;
508 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
509 args->inumber = inum;
511 args->firstblock = first;
514 args->whichfork = XFS_DATA_FORK;
517 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
518 rval = xfs_dir2_sf_replace(args);
522 rval = xfs_dir2_isblock(dp, &v);
526 rval = xfs_dir2_block_replace(args);
530 rval = xfs_dir2_isleaf(dp, &v);
534 rval = xfs_dir2_leaf_replace(args);
536 rval = xfs_dir2_node_replace(args);
543 * See if this entry can be added to the directory without allocating space.
544 * First checks that the caller couldn't reserve enough space (resblks = 0).
550 struct xfs_name *name, /* name of entry to add */
553 struct xfs_da_args *args;
555 int v; /* type-checking value */
560 ASSERT(S_ISDIR(dp->i_d.di_mode));
562 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
566 args->geo = dp->i_mount->m_dir_geo;
567 args->name = name->name;
568 args->namelen = name->len;
569 args->filetype = name->type;
570 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
572 args->whichfork = XFS_DATA_FORK;
574 args->op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
577 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
578 rval = xfs_dir2_sf_addname(args);
582 rval = xfs_dir2_isblock(dp, &v);
586 rval = xfs_dir2_block_addname(args);
590 rval = xfs_dir2_isleaf(dp, &v);
594 rval = xfs_dir2_leaf_addname(args);
596 rval = xfs_dir2_node_addname(args);
607 * Add a block to the directory.
609 * This routine is for data and free blocks, not leaf/node blocks which are
610 * handled by xfs_da_grow_inode.
614 struct xfs_da_args *args,
615 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
616 xfs_dir2_db_t *dbp) /* out: block number added */
618 struct xfs_inode *dp = args->dp;
619 struct xfs_mount *mp = dp->i_mount;
620 xfs_fileoff_t bno; /* directory offset of new block */
621 int count; /* count of filesystem blocks */
624 trace_xfs_dir2_grow_inode(args, space);
627 * Set lowest possible block in the space requested.
629 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
630 count = args->geo->fsbcount;
632 error = xfs_da_grow_inode_int(args, &bno, count);
636 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
639 * Update file's size if this is the data space and it grew.
641 if (space == XFS_DIR2_DATA_SPACE) {
642 xfs_fsize_t size; /* directory file (data) size */
644 size = XFS_FSB_TO_B(mp, bno + count);
645 if (size > dp->i_d.di_size) {
646 dp->i_d.di_size = size;
647 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
654 * See if the directory is a single-block form directory.
659 int *vp) /* out: 1 is block, 0 is not block */
661 xfs_fileoff_t last; /* last file offset */
666 if ((rval = xfs_bmap_last_offset(dp, &last, XFS_DATA_FORK)))
668 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
669 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
675 * See if the directory is a single-leaf form directory.
680 int *vp) /* out: 1 is leaf, 0 is not leaf */
682 xfs_fileoff_t last; /* last file offset */
687 if ((rval = xfs_bmap_last_offset(dp, &last, XFS_DATA_FORK)))
689 *vp = last == mp->m_dir_geo->leafblk + (1 << mp->m_sb.sb_dirblklog);
694 * Remove the given block from the directory.
695 * This routine is used for data and free blocks, leaf/node are done
696 * by xfs_da_shrink_inode.
699 xfs_dir2_shrink_inode(
704 xfs_fileoff_t bno; /* directory file offset */
705 xfs_dablk_t da; /* directory file offset */
706 int done; /* bunmap is finished */
712 trace_xfs_dir2_shrink_inode(args, db);
717 da = xfs_dir2_db_to_da(args->geo, db);
719 * Unmap the fsblock(s).
721 if ((error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount,
722 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
725 * ENOSPC actually can happen if we're in a removename with
726 * no space reservation, and the resulting block removal
727 * would cause a bmap btree split or conversion from extents
728 * to btree. This can only happen for un-fragmented
729 * directory blocks, since you need to be punching out
730 * the middle of an extent.
731 * In this case we need to leave the block in the file,
733 * So the block has to be in a consistent empty state
734 * and appropriately logged.
735 * We don't free up the buffer, the caller can tell it
736 * hasn't happened since it got an error back.
742 * Invalidate the buffer from the transaction.
744 xfs_trans_binval(tp, bp);
746 * If it's not a data block, we're done.
748 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
751 * If the block isn't the last one in the directory, we're done.
753 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
756 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
758 * This can't really happen unless there's kernel corruption.
762 if (db == args->geo->datablk)
767 * Set the size to the new last block.
769 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
770 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);