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_dirblkfsbs = mp->m_dir_geo->fsbcount;
150 mp->m_dirdatablk = mp->m_dir_geo->datablk;
151 mp->m_dirleafblk = mp->m_dir_geo->leafblk;
152 mp->m_dirfreeblk = mp->m_dir_geo->freeblk;
153 mp->m_dir_node_ents = mp->m_dir_geo->node_ents;
154 mp->m_dir_magicpct = mp->m_dir_geo->magicpct;
155 mp->m_attr_node_ents = mp->m_attr_geo->node_ents;
156 mp->m_attr_magicpct = mp->m_attr_geo->magicpct;
162 struct xfs_mount *mp)
164 kmem_free(mp->m_dir_geo);
165 kmem_free(mp->m_attr_geo);
169 * Return 1 if directory contains only "." and "..".
175 xfs_dir2_sf_hdr_t *sfp;
177 ASSERT(S_ISDIR(dp->i_d.di_mode));
178 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
180 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
182 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
187 * Validate a given inode number.
190 xfs_dir_ino_validate(
194 xfs_agblock_t agblkno;
200 agno = XFS_INO_TO_AGNO(mp, ino);
201 agblkno = XFS_INO_TO_AGBNO(mp, ino);
202 ioff = XFS_INO_TO_OFFSET(mp, ino);
203 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
205 agno < mp->m_sb.sb_agcount &&
206 agblkno < mp->m_sb.sb_agblocks &&
208 ioff < (1 << mp->m_sb.sb_inopblog) &&
209 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
210 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
211 XFS_RANDOM_DIR_INO_VALIDATE))) {
212 xfs_warn(mp, "Invalid inode number 0x%Lx",
213 (unsigned long long) ino);
214 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
215 return XFS_ERROR(EFSCORRUPTED);
221 * Initialize a directory with its "." and ".." entries.
229 struct xfs_da_args *args;
232 ASSERT(S_ISDIR(dp->i_d.di_mode));
233 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
237 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
241 args->geo = dp->i_mount->m_dir_geo;
244 error = xfs_dir2_sf_create(args, pdp->i_ino);
250 Enter a name in a directory.
256 struct xfs_name *name,
257 xfs_ino_t inum, /* new entry inode number */
258 xfs_fsblock_t *first, /* bmap's firstblock */
259 xfs_bmap_free_t *flist, /* bmap's freeblock list */
260 xfs_extlen_t total) /* bmap's total block count */
262 struct xfs_da_args *args;
264 int v; /* type-checking value */
266 ASSERT(S_ISDIR(dp->i_d.di_mode));
267 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
270 XFS_STATS_INC(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 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
291 rval = xfs_dir2_sf_addname(args);
295 rval = xfs_dir2_isblock(dp, &v);
299 rval = xfs_dir2_block_addname(args);
303 rval = xfs_dir2_isleaf(dp, &v);
307 rval = xfs_dir2_leaf_addname(args);
309 rval = xfs_dir2_node_addname(args);
317 * If doing a CI lookup and case-insensitive match, dup actual name into
318 * args.value. Return EEXIST for success (ie. name found) or an error.
321 xfs_dir_cilookup_result(
322 struct xfs_da_args *args,
323 const unsigned char *name,
326 if (args->cmpresult == XFS_CMP_DIFFERENT)
328 if (args->cmpresult != XFS_CMP_CASE ||
329 !(args->op_flags & XFS_DA_OP_CILOOKUP))
332 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
336 memcpy(args->value, name, len);
337 args->valuelen = len;
342 * Lookup a name in a directory, give back the inode number.
343 * If ci_name is not NULL, returns the actual name in ci_name if it differs
344 * to name, or ci_name->name is set to NULL for an exact match.
351 struct xfs_name *name,
352 xfs_ino_t *inum, /* out: inode number */
353 struct xfs_name *ci_name) /* out: actual name if CI match */
355 struct xfs_da_args *args;
357 int v; /* type-checking value */
359 ASSERT(S_ISDIR(dp->i_d.di_mode));
360 XFS_STATS_INC(xs_dir_lookup);
363 * We need to use KM_NOFS here so that lockdep will not throw false
364 * positive deadlock warnings on a non-transactional lookup path. It is
365 * safe to recurse into inode recalim in that case, but lockdep can't
366 * easily be taught about it. Hence KM_NOFS avoids having to add more
367 * lockdep Doing this avoids having to add a bunch of lockdep class
368 * annotations into the reclaim path for the ilock.
370 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
371 args->geo = dp->i_mount->m_dir_geo;
372 args->name = name->name;
373 args->namelen = name->len;
374 args->filetype = name->type;
375 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
377 args->whichfork = XFS_DATA_FORK;
379 args->op_flags = XFS_DA_OP_OKNOENT;
381 args->op_flags |= XFS_DA_OP_CILOOKUP;
383 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
384 rval = xfs_dir2_sf_lookup(args);
388 rval = xfs_dir2_isblock(dp, &v);
392 rval = xfs_dir2_block_lookup(args);
396 rval = xfs_dir2_isleaf(dp, &v);
400 rval = xfs_dir2_leaf_lookup(args);
402 rval = xfs_dir2_node_lookup(args);
408 *inum = args->inumber;
410 ci_name->name = args->value;
411 ci_name->len = args->valuelen;
420 * Remove an entry from a directory.
426 struct xfs_name *name,
428 xfs_fsblock_t *first, /* bmap's firstblock */
429 xfs_bmap_free_t *flist, /* bmap's freeblock list */
430 xfs_extlen_t total) /* bmap's total block count */
432 struct xfs_da_args *args;
434 int v; /* type-checking value */
436 ASSERT(S_ISDIR(dp->i_d.di_mode));
437 XFS_STATS_INC(xs_dir_remove);
439 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
443 args->geo = dp->i_mount->m_dir_geo;
444 args->name = name->name;
445 args->namelen = name->len;
446 args->filetype = name->type;
447 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
450 args->firstblock = first;
453 args->whichfork = XFS_DATA_FORK;
456 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
457 rval = xfs_dir2_sf_removename(args);
461 rval = xfs_dir2_isblock(dp, &v);
465 rval = xfs_dir2_block_removename(args);
469 rval = xfs_dir2_isleaf(dp, &v);
473 rval = xfs_dir2_leaf_removename(args);
475 rval = xfs_dir2_node_removename(args);
482 * Replace the inode number of a directory entry.
488 struct xfs_name *name, /* name of entry to replace */
489 xfs_ino_t inum, /* new inode number */
490 xfs_fsblock_t *first, /* bmap's firstblock */
491 xfs_bmap_free_t *flist, /* bmap's freeblock list */
492 xfs_extlen_t total) /* bmap's total block count */
494 struct xfs_da_args *args;
496 int v; /* type-checking value */
498 ASSERT(S_ISDIR(dp->i_d.di_mode));
500 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
504 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
508 args->geo = dp->i_mount->m_dir_geo;
509 args->name = name->name;
510 args->namelen = name->len;
511 args->filetype = name->type;
512 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
513 args->inumber = inum;
515 args->firstblock = first;
518 args->whichfork = XFS_DATA_FORK;
521 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
522 rval = xfs_dir2_sf_replace(args);
526 rval = xfs_dir2_isblock(dp, &v);
530 rval = xfs_dir2_block_replace(args);
534 rval = xfs_dir2_isleaf(dp, &v);
538 rval = xfs_dir2_leaf_replace(args);
540 rval = xfs_dir2_node_replace(args);
547 * See if this entry can be added to the directory without allocating space.
548 * First checks that the caller couldn't reserve enough space (resblks = 0).
554 struct xfs_name *name, /* name of entry to add */
557 struct xfs_da_args *args;
559 int v; /* type-checking value */
564 ASSERT(S_ISDIR(dp->i_d.di_mode));
566 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
570 args->geo = dp->i_mount->m_dir_geo;
571 args->name = name->name;
572 args->namelen = name->len;
573 args->filetype = name->type;
574 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
576 args->whichfork = XFS_DATA_FORK;
578 args->op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
581 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
582 rval = xfs_dir2_sf_addname(args);
586 rval = xfs_dir2_isblock(dp, &v);
590 rval = xfs_dir2_block_addname(args);
594 rval = xfs_dir2_isleaf(dp, &v);
598 rval = xfs_dir2_leaf_addname(args);
600 rval = xfs_dir2_node_addname(args);
611 * Add a block to the directory.
613 * This routine is for data and free blocks, not leaf/node blocks which are
614 * handled by xfs_da_grow_inode.
618 struct xfs_da_args *args,
619 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
620 xfs_dir2_db_t *dbp) /* out: block number added */
622 struct xfs_inode *dp = args->dp;
623 struct xfs_mount *mp = dp->i_mount;
624 xfs_fileoff_t bno; /* directory offset of new block */
625 int count; /* count of filesystem blocks */
628 trace_xfs_dir2_grow_inode(args, space);
631 * Set lowest possible block in the space requested.
633 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
634 count = mp->m_dirblkfsbs;
636 error = xfs_da_grow_inode_int(args, &bno, count);
640 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
643 * Update file's size if this is the data space and it grew.
645 if (space == XFS_DIR2_DATA_SPACE) {
646 xfs_fsize_t size; /* directory file (data) size */
648 size = XFS_FSB_TO_B(mp, bno + count);
649 if (size > dp->i_d.di_size) {
650 dp->i_d.di_size = size;
651 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
658 * See if the directory is a single-block form directory.
663 int *vp) /* out: 1 is block, 0 is not block */
665 xfs_fileoff_t last; /* last file offset */
670 if ((rval = xfs_bmap_last_offset(dp, &last, XFS_DATA_FORK)))
672 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
673 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
679 * See if the directory is a single-leaf form directory.
684 int *vp) /* out: 1 is leaf, 0 is not leaf */
686 xfs_fileoff_t last; /* last file offset */
691 if ((rval = xfs_bmap_last_offset(dp, &last, XFS_DATA_FORK)))
693 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
698 * Remove the given block from the directory.
699 * This routine is used for data and free blocks, leaf/node are done
700 * by xfs_da_shrink_inode.
703 xfs_dir2_shrink_inode(
708 xfs_fileoff_t bno; /* directory file offset */
709 xfs_dablk_t da; /* directory file offset */
710 int done; /* bunmap is finished */
716 trace_xfs_dir2_shrink_inode(args, db);
721 da = xfs_dir2_db_to_da(args->geo, db);
723 * Unmap the fsblock(s).
725 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
726 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
729 * ENOSPC actually can happen if we're in a removename with
730 * no space reservation, and the resulting block removal
731 * would cause a bmap btree split or conversion from extents
732 * to btree. This can only happen for un-fragmented
733 * directory blocks, since you need to be punching out
734 * the middle of an extent.
735 * In this case we need to leave the block in the file,
737 * So the block has to be in a consistent empty state
738 * and appropriately logged.
739 * We don't free up the buffer, the caller can tell it
740 * hasn't happened since it got an error back.
746 * Invalidate the buffer from the transaction.
748 xfs_trans_binval(tp, bp);
750 * If it's not a data block, we're done.
752 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
755 * If the block isn't the last one in the directory, we're done.
757 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
760 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
762 * This can't really happen unless there's kernel corruption.
766 if (db == mp->m_dirdatablk)
771 * Set the size to the new last block.
773 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
774 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);