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"
23 #include "xfs_mount.h"
24 #include "xfs_da_format.h"
25 #include "xfs_da_btree.h"
26 #include "xfs_inode.h"
27 #include "xfs_trans.h"
28 #include "xfs_inode_item.h"
31 #include "xfs_dir2_priv.h"
32 #include "xfs_error.h"
33 #include "xfs_trace.h"
35 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
39 * ASCII case-insensitive (ie. A-Z) support for directories that was
43 xfs_ascii_ci_hashname(
44 struct xfs_name *name)
49 for (i = 0, hash = 0; i < name->len; i++)
50 hash = tolower(name->name[i]) ^ rol32(hash, 7);
56 xfs_ascii_ci_compname(
57 struct xfs_da_args *args,
58 const unsigned char *name,
61 enum xfs_dacmp result;
64 if (args->namelen != len)
65 return XFS_CMP_DIFFERENT;
67 result = XFS_CMP_EXACT;
68 for (i = 0; i < len; i++) {
69 if (args->name[i] == name[i])
71 if (tolower(args->name[i]) != tolower(name[i]))
72 return XFS_CMP_DIFFERENT;
73 result = XFS_CMP_CASE;
79 static struct xfs_nameops xfs_ascii_ci_nameops = {
80 .hashname = xfs_ascii_ci_hashname,
81 .compname = xfs_ascii_ci_compname,
88 struct xfs_da_geometry *dageo;
92 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
93 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
96 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
97 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
99 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
100 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
101 KM_SLEEP | KM_MAYFAIL);
102 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
103 KM_SLEEP | KM_MAYFAIL);
104 if (!mp->m_dir_geo || !mp->m_attr_geo) {
105 kmem_free(mp->m_dir_geo);
106 kmem_free(mp->m_attr_geo);
110 /* set up directory geometry */
111 dageo = mp->m_dir_geo;
112 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
113 dageo->fsblog = mp->m_sb.sb_blocklog;
114 dageo->blksize = 1 << dageo->blklog;
115 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
118 * Now we've set up the block conversion variables, we can calculate the
119 * segment block constants using the geometry structure.
121 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
122 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
123 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
124 dageo->node_ents = (dageo->blksize - nodehdr_size) /
125 (uint)sizeof(xfs_da_node_entry_t);
126 dageo->magicpct = (dageo->blksize * 37) / 100;
128 /* set up attribute geometry - single fsb only */
129 dageo = mp->m_attr_geo;
130 dageo->blklog = mp->m_sb.sb_blocklog;
131 dageo->fsblog = mp->m_sb.sb_blocklog;
132 dageo->blksize = 1 << dageo->blklog;
134 dageo->node_ents = (dageo->blksize - nodehdr_size) /
135 (uint)sizeof(xfs_da_node_entry_t);
136 dageo->magicpct = (dageo->blksize * 37) / 100;
138 if (xfs_sb_version_hasasciici(&mp->m_sb))
139 mp->m_dirnameops = &xfs_ascii_ci_nameops;
141 mp->m_dirnameops = &xfs_default_nameops;
148 struct xfs_mount *mp)
150 kmem_free(mp->m_dir_geo);
151 kmem_free(mp->m_attr_geo);
155 * Return 1 if directory contains only "." and "..".
161 xfs_dir2_sf_hdr_t *sfp;
163 ASSERT(S_ISDIR(dp->i_d.di_mode));
164 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
166 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
168 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
173 * Validate a given inode number.
176 xfs_dir_ino_validate(
180 xfs_agblock_t agblkno;
186 agno = XFS_INO_TO_AGNO(mp, ino);
187 agblkno = XFS_INO_TO_AGBNO(mp, ino);
188 ioff = XFS_INO_TO_OFFSET(mp, ino);
189 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
191 agno < mp->m_sb.sb_agcount &&
192 agblkno < mp->m_sb.sb_agblocks &&
194 ioff < (1 << mp->m_sb.sb_inopblog) &&
195 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
196 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
197 XFS_RANDOM_DIR_INO_VALIDATE))) {
198 xfs_warn(mp, "Invalid inode number 0x%Lx",
199 (unsigned long long) ino);
200 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
201 return -EFSCORRUPTED;
207 * Initialize a directory with its "." and ".." entries.
215 struct xfs_da_args *args;
218 ASSERT(S_ISDIR(dp->i_d.di_mode));
219 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
223 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
227 args->geo = dp->i_mount->m_dir_geo;
230 error = xfs_dir2_sf_create(args, pdp->i_ino);
236 * Enter a name in a directory, or check for available space.
237 * If inum is 0, only the available space test is performed.
243 struct xfs_name *name,
244 xfs_ino_t inum, /* new entry inode number */
245 xfs_fsblock_t *first, /* bmap's firstblock */
246 xfs_bmap_free_t *flist, /* bmap's freeblock list */
247 xfs_extlen_t total) /* bmap's total block count */
249 struct xfs_da_args *args;
251 int v; /* type-checking value */
253 ASSERT(S_ISDIR(dp->i_d.di_mode));
255 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
258 XFS_STATS_INC(xs_dir_create);
261 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
265 args->geo = dp->i_mount->m_dir_geo;
266 args->name = name->name;
267 args->namelen = name->len;
268 args->filetype = name->type;
269 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
270 args->inumber = inum;
272 args->firstblock = first;
275 args->whichfork = XFS_DATA_FORK;
277 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
279 args->op_flags |= XFS_DA_OP_JUSTCHECK;
281 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
282 rval = xfs_dir2_sf_addname(args);
286 rval = xfs_dir2_isblock(args, &v);
290 rval = xfs_dir2_block_addname(args);
294 rval = xfs_dir2_isleaf(args, &v);
298 rval = xfs_dir2_leaf_addname(args);
300 rval = xfs_dir2_node_addname(args);
308 * If doing a CI lookup and case-insensitive match, dup actual name into
309 * args.value. Return EEXIST for success (ie. name found) or an error.
312 xfs_dir_cilookup_result(
313 struct xfs_da_args *args,
314 const unsigned char *name,
317 if (args->cmpresult == XFS_CMP_DIFFERENT)
319 if (args->cmpresult != XFS_CMP_CASE ||
320 !(args->op_flags & XFS_DA_OP_CILOOKUP))
323 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
327 memcpy(args->value, name, len);
328 args->valuelen = len;
333 * Lookup a name in a directory, give back the inode number.
334 * If ci_name is not NULL, returns the actual name in ci_name if it differs
335 * to name, or ci_name->name is set to NULL for an exact match.
342 struct xfs_name *name,
343 xfs_ino_t *inum, /* out: inode number */
344 struct xfs_name *ci_name) /* out: actual name if CI match */
346 struct xfs_da_args *args;
348 int v; /* type-checking value */
350 ASSERT(S_ISDIR(dp->i_d.di_mode));
351 XFS_STATS_INC(xs_dir_lookup);
354 * We need to use KM_NOFS here so that lockdep will not throw false
355 * positive deadlock warnings on a non-transactional lookup path. It is
356 * safe to recurse into inode recalim in that case, but lockdep can't
357 * easily be taught about it. Hence KM_NOFS avoids having to add more
358 * lockdep Doing this avoids having to add a bunch of lockdep class
359 * annotations into the reclaim path for the ilock.
361 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
362 args->geo = dp->i_mount->m_dir_geo;
363 args->name = name->name;
364 args->namelen = name->len;
365 args->filetype = name->type;
366 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
368 args->whichfork = XFS_DATA_FORK;
370 args->op_flags = XFS_DA_OP_OKNOENT;
372 args->op_flags |= XFS_DA_OP_CILOOKUP;
374 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
375 rval = xfs_dir2_sf_lookup(args);
379 rval = xfs_dir2_isblock(args, &v);
383 rval = xfs_dir2_block_lookup(args);
387 rval = xfs_dir2_isleaf(args, &v);
391 rval = xfs_dir2_leaf_lookup(args);
393 rval = xfs_dir2_node_lookup(args);
399 *inum = args->inumber;
401 ci_name->name = args->value;
402 ci_name->len = args->valuelen;
411 * Remove an entry from a directory.
417 struct xfs_name *name,
419 xfs_fsblock_t *first, /* bmap's firstblock */
420 xfs_bmap_free_t *flist, /* bmap's freeblock list */
421 xfs_extlen_t total) /* bmap's total block count */
423 struct xfs_da_args *args;
425 int v; /* type-checking value */
427 ASSERT(S_ISDIR(dp->i_d.di_mode));
428 XFS_STATS_INC(xs_dir_remove);
430 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
434 args->geo = dp->i_mount->m_dir_geo;
435 args->name = name->name;
436 args->namelen = name->len;
437 args->filetype = name->type;
438 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
441 args->firstblock = first;
444 args->whichfork = XFS_DATA_FORK;
447 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
448 rval = xfs_dir2_sf_removename(args);
452 rval = xfs_dir2_isblock(args, &v);
456 rval = xfs_dir2_block_removename(args);
460 rval = xfs_dir2_isleaf(args, &v);
464 rval = xfs_dir2_leaf_removename(args);
466 rval = xfs_dir2_node_removename(args);
473 * Replace the inode number of a directory entry.
479 struct xfs_name *name, /* name of entry to replace */
480 xfs_ino_t inum, /* new inode number */
481 xfs_fsblock_t *first, /* bmap's firstblock */
482 xfs_bmap_free_t *flist, /* bmap's freeblock list */
483 xfs_extlen_t total) /* bmap's total block count */
485 struct xfs_da_args *args;
487 int v; /* type-checking value */
489 ASSERT(S_ISDIR(dp->i_d.di_mode));
491 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
495 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
499 args->geo = dp->i_mount->m_dir_geo;
500 args->name = name->name;
501 args->namelen = name->len;
502 args->filetype = name->type;
503 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
504 args->inumber = inum;
506 args->firstblock = first;
509 args->whichfork = XFS_DATA_FORK;
512 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
513 rval = xfs_dir2_sf_replace(args);
517 rval = xfs_dir2_isblock(args, &v);
521 rval = xfs_dir2_block_replace(args);
525 rval = xfs_dir2_isleaf(args, &v);
529 rval = xfs_dir2_leaf_replace(args);
531 rval = xfs_dir2_node_replace(args);
538 * See if this entry can be added to the directory without allocating space.
544 struct xfs_name *name) /* name of entry to add */
546 return xfs_dir_createname(tp, dp, name, 0, NULL, NULL, 0);
554 * Add a block to the directory.
556 * This routine is for data and free blocks, not leaf/node blocks which are
557 * handled by xfs_da_grow_inode.
561 struct xfs_da_args *args,
562 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
563 xfs_dir2_db_t *dbp) /* out: block number added */
565 struct xfs_inode *dp = args->dp;
566 struct xfs_mount *mp = dp->i_mount;
567 xfs_fileoff_t bno; /* directory offset of new block */
568 int count; /* count of filesystem blocks */
571 trace_xfs_dir2_grow_inode(args, space);
574 * Set lowest possible block in the space requested.
576 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
577 count = args->geo->fsbcount;
579 error = xfs_da_grow_inode_int(args, &bno, count);
583 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
586 * Update file's size if this is the data space and it grew.
588 if (space == XFS_DIR2_DATA_SPACE) {
589 xfs_fsize_t size; /* directory file (data) size */
591 size = XFS_FSB_TO_B(mp, bno + count);
592 if (size > dp->i_d.di_size) {
593 dp->i_d.di_size = size;
594 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
601 * See if the directory is a single-block form directory.
605 struct xfs_da_args *args,
606 int *vp) /* out: 1 is block, 0 is not block */
608 xfs_fileoff_t last; /* last file offset */
611 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
613 rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize;
614 ASSERT(rval == 0 || args->dp->i_d.di_size == args->geo->blksize);
620 * See if the directory is a single-leaf form directory.
624 struct xfs_da_args *args,
625 int *vp) /* out: 1 is block, 0 is not block */
627 xfs_fileoff_t last; /* last file offset */
630 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
632 *vp = last == args->geo->leafblk + args->geo->fsbcount;
637 * Remove the given block from the directory.
638 * This routine is used for data and free blocks, leaf/node are done
639 * by xfs_da_shrink_inode.
642 xfs_dir2_shrink_inode(
647 xfs_fileoff_t bno; /* directory file offset */
648 xfs_dablk_t da; /* directory file offset */
649 int done; /* bunmap is finished */
655 trace_xfs_dir2_shrink_inode(args, db);
660 da = xfs_dir2_db_to_da(args->geo, db);
662 * Unmap the fsblock(s).
664 if ((error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount,
665 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
668 * ENOSPC actually can happen if we're in a removename with
669 * no space reservation, and the resulting block removal
670 * would cause a bmap btree split or conversion from extents
671 * to btree. This can only happen for un-fragmented
672 * directory blocks, since you need to be punching out
673 * the middle of an extent.
674 * In this case we need to leave the block in the file,
676 * So the block has to be in a consistent empty state
677 * and appropriately logged.
678 * We don't free up the buffer, the caller can tell it
679 * hasn't happened since it got an error back.
685 * Invalidate the buffer from the transaction.
687 xfs_trans_binval(tp, bp);
689 * If it's not a data block, we're done.
691 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
694 * If the block isn't the last one in the directory, we're done.
696 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
699 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
701 * This can't really happen unless there's kernel corruption.
705 if (db == args->geo->datablk)
710 * Set the size to the new last block.
712 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
713 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);