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_types.h"
24 #include "xfs_trans.h"
28 #include "xfs_mount.h"
29 #include "xfs_da_btree.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_dir2_sf.h"
33 #include "xfs_attr_sf.h"
34 #include "xfs_dinode.h"
35 #include "xfs_inode.h"
36 #include "xfs_inode_item.h"
38 #include "xfs_dir2_data.h"
39 #include "xfs_dir2_leaf.h"
40 #include "xfs_dir2_block.h"
41 #include "xfs_dir2_node.h"
42 #include "xfs_error.h"
43 #include "xfs_vnodeops.h"
44 #include "xfs_trace.h"
46 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
49 * ASCII case-insensitive (ie. A-Z) support for directories that was
53 xfs_ascii_ci_hashname(
54 struct xfs_name *name)
59 for (i = 0, hash = 0; i < name->len; i++)
60 hash = tolower(name->name[i]) ^ rol32(hash, 7);
66 xfs_ascii_ci_compname(
67 struct xfs_da_args *args,
68 const unsigned char *name,
71 enum xfs_dacmp result;
74 if (args->namelen != len)
75 return XFS_CMP_DIFFERENT;
77 result = XFS_CMP_EXACT;
78 for (i = 0; i < len; i++) {
79 if (args->name[i] == name[i])
81 if (tolower(args->name[i]) != tolower(name[i]))
82 return XFS_CMP_DIFFERENT;
83 result = XFS_CMP_CASE;
89 static struct xfs_nameops xfs_ascii_ci_nameops = {
90 .hashname = xfs_ascii_ci_hashname,
91 .compname = xfs_ascii_ci_compname,
98 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
99 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
101 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
102 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
103 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
104 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
105 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
106 mp->m_attr_node_ents =
107 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
108 (uint)sizeof(xfs_da_node_entry_t);
109 mp->m_dir_node_ents =
110 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
111 (uint)sizeof(xfs_da_node_entry_t);
112 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
113 if (xfs_sb_version_hasasciici(&mp->m_sb))
114 mp->m_dirnameops = &xfs_ascii_ci_nameops;
116 mp->m_dirnameops = &xfs_default_nameops;
120 * Return 1 if directory contains only "." and "..".
128 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
129 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
131 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
133 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
134 return !sfp->hdr.count;
138 * Validate a given inode number.
141 xfs_dir_ino_validate(
145 xfs_agblock_t agblkno;
151 agno = XFS_INO_TO_AGNO(mp, ino);
152 agblkno = XFS_INO_TO_AGBNO(mp, ino);
153 ioff = XFS_INO_TO_OFFSET(mp, ino);
154 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
156 agno < mp->m_sb.sb_agcount &&
157 agblkno < mp->m_sb.sb_agblocks &&
159 ioff < (1 << mp->m_sb.sb_inopblog) &&
160 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
161 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
162 XFS_RANDOM_DIR_INO_VALIDATE))) {
163 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
164 (unsigned long long) ino);
165 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
166 return XFS_ERROR(EFSCORRUPTED);
172 * Initialize a directory with its "." and ".." entries.
183 memset((char *)&args, 0, sizeof(args));
186 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
187 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
189 return xfs_dir2_sf_create(&args, pdp->i_ino);
193 Enter a name in a directory.
199 struct xfs_name *name,
200 xfs_ino_t inum, /* new entry inode number */
201 xfs_fsblock_t *first, /* bmap's firstblock */
202 xfs_bmap_free_t *flist, /* bmap's freeblock list */
203 xfs_extlen_t total) /* bmap's total block count */
207 int v; /* type-checking value */
209 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
210 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
212 XFS_STATS_INC(xs_dir_create);
214 memset(&args, 0, sizeof(xfs_da_args_t));
215 args.name = name->name;
216 args.namelen = name->len;
217 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
220 args.firstblock = first;
223 args.whichfork = XFS_DATA_FORK;
225 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
227 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
228 rval = xfs_dir2_sf_addname(&args);
229 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
232 rval = xfs_dir2_block_addname(&args);
233 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
236 rval = xfs_dir2_leaf_addname(&args);
238 rval = xfs_dir2_node_addname(&args);
243 * If doing a CI lookup and case-insensitive match, dup actual name into
244 * args.value. Return EEXIST for success (ie. name found) or an error.
247 xfs_dir_cilookup_result(
248 struct xfs_da_args *args,
249 const unsigned char *name,
252 if (args->cmpresult == XFS_CMP_DIFFERENT)
254 if (args->cmpresult != XFS_CMP_CASE ||
255 !(args->op_flags & XFS_DA_OP_CILOOKUP))
258 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
262 memcpy(args->value, name, len);
263 args->valuelen = len;
268 * Lookup a name in a directory, give back the inode number.
269 * If ci_name is not NULL, returns the actual name in ci_name if it differs
270 * to name, or ci_name->name is set to NULL for an exact match.
277 struct xfs_name *name,
278 xfs_ino_t *inum, /* out: inode number */
279 struct xfs_name *ci_name) /* out: actual name if CI match */
283 int v; /* type-checking value */
285 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
286 XFS_STATS_INC(xs_dir_lookup);
288 memset(&args, 0, sizeof(xfs_da_args_t));
289 args.name = name->name;
290 args.namelen = name->len;
291 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
293 args.whichfork = XFS_DATA_FORK;
295 args.op_flags = XFS_DA_OP_OKNOENT;
297 args.op_flags |= XFS_DA_OP_CILOOKUP;
299 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
300 rval = xfs_dir2_sf_lookup(&args);
301 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
304 rval = xfs_dir2_block_lookup(&args);
305 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
308 rval = xfs_dir2_leaf_lookup(&args);
310 rval = xfs_dir2_node_lookup(&args);
314 *inum = args.inumber;
316 ci_name->name = args.value;
317 ci_name->len = args.valuelen;
324 * Remove an entry from a directory.
330 struct xfs_name *name,
332 xfs_fsblock_t *first, /* bmap's firstblock */
333 xfs_bmap_free_t *flist, /* bmap's freeblock list */
334 xfs_extlen_t total) /* bmap's total block count */
338 int v; /* type-checking value */
340 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
341 XFS_STATS_INC(xs_dir_remove);
343 memset(&args, 0, sizeof(xfs_da_args_t));
344 args.name = name->name;
345 args.namelen = name->len;
346 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
349 args.firstblock = first;
352 args.whichfork = XFS_DATA_FORK;
355 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
356 rval = xfs_dir2_sf_removename(&args);
357 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
360 rval = xfs_dir2_block_removename(&args);
361 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
364 rval = xfs_dir2_leaf_removename(&args);
366 rval = xfs_dir2_node_removename(&args);
381 int rval; /* return value */
382 int v; /* type-checking value */
384 xfs_itrace_entry(dp);
386 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
387 return XFS_ERROR(EIO);
389 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
390 XFS_STATS_INC(xs_dir_getdents);
392 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
393 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
394 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
397 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
399 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
405 * Replace the inode number of a directory entry.
411 struct xfs_name *name, /* name of entry to replace */
412 xfs_ino_t inum, /* new inode number */
413 xfs_fsblock_t *first, /* bmap's firstblock */
414 xfs_bmap_free_t *flist, /* bmap's freeblock list */
415 xfs_extlen_t total) /* bmap's total block count */
419 int v; /* type-checking value */
421 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
423 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
426 memset(&args, 0, sizeof(xfs_da_args_t));
427 args.name = name->name;
428 args.namelen = name->len;
429 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
432 args.firstblock = first;
435 args.whichfork = XFS_DATA_FORK;
438 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
439 rval = xfs_dir2_sf_replace(&args);
440 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
443 rval = xfs_dir2_block_replace(&args);
444 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
447 rval = xfs_dir2_leaf_replace(&args);
449 rval = xfs_dir2_node_replace(&args);
454 * See if this entry can be added to the directory without allocating space.
455 * First checks that the caller couldn't reserve enough space (resblks = 0).
461 struct xfs_name *name, /* name of entry to add */
466 int v; /* type-checking value */
471 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
473 memset(&args, 0, sizeof(xfs_da_args_t));
474 args.name = name->name;
475 args.namelen = name->len;
476 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
478 args.whichfork = XFS_DATA_FORK;
480 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
483 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
484 rval = xfs_dir2_sf_addname(&args);
485 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
488 rval = xfs_dir2_block_addname(&args);
489 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
492 rval = xfs_dir2_leaf_addname(&args);
494 rval = xfs_dir2_node_addname(&args);
503 * Add a block to the directory.
504 * This routine is for data and free blocks, not leaf/node blocks
505 * which are handled by xfs_da_grow_inode.
510 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
511 xfs_dir2_db_t *dbp) /* out: block number added */
513 xfs_fileoff_t bno; /* directory offset of new block */
514 int count; /* count of filesystem blocks */
515 xfs_inode_t *dp; /* incore directory inode */
517 int got; /* blocks actually mapped */
519 xfs_bmbt_irec_t map; /* single structure for bmap */
520 int mapi; /* mapping index */
521 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
523 int nmap; /* number of bmap entries */
527 trace_xfs_dir2_grow_inode(args, space);
532 nblks = dp->i_d.di_nblocks;
534 * Set lowest possible block in the space requested.
536 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
537 count = mp->m_dirblkfsbs;
539 * Find the first hole for our block.
541 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
544 ASSERT(args->firstblock != NULL);
546 * Try mapping the new block contiguously (one extent).
548 if ((error = xfs_bmapi(tp, dp, bno, count,
549 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
550 args->firstblock, args->total, &map, &nmap,
559 * Didn't work and this is a multiple-fsb directory block.
560 * Try again with contiguous flag turned on.
562 else if (nmap == 0 && count > 1) {
563 xfs_fileoff_t b; /* current file offset */
566 * Space for maximum number of mappings.
568 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
570 * Iterate until we get to the end of our block.
572 for (b = bno, mapi = 0; b < bno + count; ) {
573 int c; /* current fsb count */
576 * Can't map more than MAX_NMAP at once.
578 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
579 c = (int)(bno + count - b);
580 if ((error = xfs_bmapi(tp, dp, b, c,
581 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
582 args->firstblock, args->total,
583 &mapp[mapi], &nmap, args->flist,
591 * Add this bunch into our table, go to the next offset.
594 b = mapp[mapi - 1].br_startoff +
595 mapp[mapi - 1].br_blockcount;
606 * See how many fsb's we got.
608 for (i = 0, got = 0; i < mapi; i++)
609 got += mapp[i].br_blockcount;
611 * Didn't get enough fsb's, or the first/last block's are wrong.
613 if (got != count || mapp[0].br_startoff != bno ||
614 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
618 return XFS_ERROR(ENOSPC);
621 * Done with the temporary mapping table.
626 /* account for newly allocated blocks in reserved blocks total */
627 args->total -= dp->i_d.di_nblocks - nblks;
628 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
631 * Update file's size if this is the data space and it grew.
633 if (space == XFS_DIR2_DATA_SPACE) {
634 xfs_fsize_t size; /* directory file (data) size */
636 size = XFS_FSB_TO_B(mp, bno + count);
637 if (size > dp->i_d.di_size) {
638 dp->i_d.di_size = size;
639 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
646 * See if the directory is a single-block form directory.
652 int *vp) /* out: 1 is block, 0 is not block */
654 xfs_fileoff_t last; /* last file offset */
659 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
661 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
662 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
668 * See if the directory is a single-leaf form directory.
674 int *vp) /* out: 1 is leaf, 0 is not leaf */
676 xfs_fileoff_t last; /* last file offset */
681 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
683 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
688 * Remove the given block from the directory.
689 * This routine is used for data and free blocks, leaf/node are done
690 * by xfs_da_shrink_inode.
693 xfs_dir2_shrink_inode(
698 xfs_fileoff_t bno; /* directory file offset */
699 xfs_dablk_t da; /* directory file offset */
700 int done; /* bunmap is finished */
706 trace_xfs_dir2_shrink_inode(args, db);
711 da = xfs_dir2_db_to_da(mp, db);
713 * Unmap the fsblock(s).
715 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
716 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
719 * ENOSPC actually can happen if we're in a removename with
720 * no space reservation, and the resulting block removal
721 * would cause a bmap btree split or conversion from extents
722 * to btree. This can only happen for un-fragmented
723 * directory blocks, since you need to be punching out
724 * the middle of an extent.
725 * In this case we need to leave the block in the file,
727 * So the block has to be in a consistent empty state
728 * and appropriately logged.
729 * We don't free up the buffer, the caller can tell it
730 * hasn't happened since it got an error back.
736 * Invalidate the buffer from the transaction.
738 xfs_da_binval(tp, bp);
740 * If it's not a data block, we're done.
742 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
745 * If the block isn't the last one in the directory, we're done.
747 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
750 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
752 * This can't really happen unless there's kernel corruption.
756 if (db == mp->m_dirdatablk)
761 * Set the size to the new last block.
763 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
764 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);