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"
23 #include "xfs_trans.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_btree.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_dinode.h"
31 #include "xfs_inode.h"
32 #include "xfs_inode_item.h"
34 #include "xfs_dir2_format.h"
36 #include "xfs_dir2_priv.h"
37 #include "xfs_error.h"
38 #include "xfs_trace.h"
40 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
44 * ASCII case-insensitive (ie. A-Z) support for directories that was
48 xfs_ascii_ci_hashname(
49 struct xfs_name *name)
54 for (i = 0, hash = 0; i < name->len; i++)
55 hash = tolower(name->name[i]) ^ rol32(hash, 7);
61 xfs_ascii_ci_compname(
62 struct xfs_da_args *args,
63 const unsigned char *name,
66 enum xfs_dacmp result;
69 if (args->namelen != len)
70 return XFS_CMP_DIFFERENT;
72 result = XFS_CMP_EXACT;
73 for (i = 0; i < len; i++) {
74 if (args->name[i] == name[i])
76 if (tolower(args->name[i]) != tolower(name[i]))
77 return XFS_CMP_DIFFERENT;
78 result = XFS_CMP_CASE;
84 static struct xfs_nameops xfs_ascii_ci_nameops = {
85 .hashname = xfs_ascii_ci_hashname,
86 .compname = xfs_ascii_ci_compname,
96 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
97 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
99 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
100 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
101 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
102 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
103 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
105 nodehdr_size = __xfs_da3_node_hdr_size(xfs_sb_version_hascrc(&mp->m_sb));
106 mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
107 (uint)sizeof(xfs_da_node_entry_t);
108 mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
109 (uint)sizeof(xfs_da_node_entry_t);
111 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
112 if (xfs_sb_version_hasasciici(&mp->m_sb))
113 mp->m_dirnameops = &xfs_ascii_ci_nameops;
115 mp->m_dirnameops = &xfs_default_nameops;
119 * Return 1 if directory contains only "." and "..".
125 xfs_dir2_sf_hdr_t *sfp;
127 ASSERT(S_ISDIR(dp->i_d.di_mode));
128 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
130 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
132 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
137 * Validate a given inode number.
140 xfs_dir_ino_validate(
144 xfs_agblock_t agblkno;
150 agno = XFS_INO_TO_AGNO(mp, ino);
151 agblkno = XFS_INO_TO_AGBNO(mp, ino);
152 ioff = XFS_INO_TO_OFFSET(mp, ino);
153 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
155 agno < mp->m_sb.sb_agcount &&
156 agblkno < mp->m_sb.sb_agblocks &&
158 ioff < (1 << mp->m_sb.sb_inopblog) &&
159 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
160 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
161 XFS_RANDOM_DIR_INO_VALIDATE))) {
162 xfs_warn(mp, "Invalid inode number 0x%Lx",
163 (unsigned long long) ino);
164 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
165 return XFS_ERROR(EFSCORRUPTED);
171 * Initialize a directory with its "." and ".." entries.
182 memset((char *)&args, 0, sizeof(args));
185 ASSERT(S_ISDIR(dp->i_d.di_mode));
186 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
188 return xfs_dir2_sf_create(&args, pdp->i_ino);
192 Enter a name in a directory.
198 struct xfs_name *name,
199 xfs_ino_t inum, /* new entry inode number */
200 xfs_fsblock_t *first, /* bmap's firstblock */
201 xfs_bmap_free_t *flist, /* bmap's freeblock list */
202 xfs_extlen_t total) /* bmap's total block count */
206 int v; /* type-checking value */
208 ASSERT(S_ISDIR(dp->i_d.di_mode));
209 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
211 XFS_STATS_INC(xs_dir_create);
213 memset(&args, 0, sizeof(xfs_da_args_t));
214 args.name = name->name;
215 args.namelen = name->len;
216 args.filetype = name->type;
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(S_ISDIR(dp->i_d.di_mode));
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.filetype = name->type;
292 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
294 args.whichfork = XFS_DATA_FORK;
296 args.op_flags = XFS_DA_OP_OKNOENT;
298 args.op_flags |= XFS_DA_OP_CILOOKUP;
300 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
301 rval = xfs_dir2_sf_lookup(&args);
302 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
305 rval = xfs_dir2_block_lookup(&args);
306 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
309 rval = xfs_dir2_leaf_lookup(&args);
311 rval = xfs_dir2_node_lookup(&args);
315 *inum = args.inumber;
317 ci_name->name = args.value;
318 ci_name->len = args.valuelen;
325 * Remove an entry from a directory.
331 struct xfs_name *name,
333 xfs_fsblock_t *first, /* bmap's firstblock */
334 xfs_bmap_free_t *flist, /* bmap's freeblock list */
335 xfs_extlen_t total) /* bmap's total block count */
339 int v; /* type-checking value */
341 ASSERT(S_ISDIR(dp->i_d.di_mode));
342 XFS_STATS_INC(xs_dir_remove);
344 memset(&args, 0, sizeof(xfs_da_args_t));
345 args.name = name->name;
346 args.namelen = name->len;
347 args.filetype = name->type;
348 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
351 args.firstblock = first;
354 args.whichfork = XFS_DATA_FORK;
357 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
358 rval = xfs_dir2_sf_removename(&args);
359 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
362 rval = xfs_dir2_block_removename(&args);
363 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
366 rval = xfs_dir2_leaf_removename(&args);
368 rval = xfs_dir2_node_removename(&args);
373 * Replace the inode number of a directory entry.
379 struct xfs_name *name, /* name of entry to replace */
380 xfs_ino_t inum, /* new inode number */
381 xfs_fsblock_t *first, /* bmap's firstblock */
382 xfs_bmap_free_t *flist, /* bmap's freeblock list */
383 xfs_extlen_t total) /* bmap's total block count */
387 int v; /* type-checking value */
389 ASSERT(S_ISDIR(dp->i_d.di_mode));
391 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
394 memset(&args, 0, sizeof(xfs_da_args_t));
395 args.name = name->name;
396 args.namelen = name->len;
397 args.filetype = name->type;
398 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
401 args.firstblock = first;
404 args.whichfork = XFS_DATA_FORK;
407 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
408 rval = xfs_dir2_sf_replace(&args);
409 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
412 rval = xfs_dir2_block_replace(&args);
413 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
416 rval = xfs_dir2_leaf_replace(&args);
418 rval = xfs_dir2_node_replace(&args);
423 * See if this entry can be added to the directory without allocating space.
424 * First checks that the caller couldn't reserve enough space (resblks = 0).
430 struct xfs_name *name, /* name of entry to add */
435 int v; /* type-checking value */
440 ASSERT(S_ISDIR(dp->i_d.di_mode));
442 memset(&args, 0, sizeof(xfs_da_args_t));
443 args.name = name->name;
444 args.namelen = name->len;
445 args.filetype = name->type;
446 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
448 args.whichfork = XFS_DATA_FORK;
450 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
453 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
454 rval = xfs_dir2_sf_addname(&args);
455 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
458 rval = xfs_dir2_block_addname(&args);
459 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
462 rval = xfs_dir2_leaf_addname(&args);
464 rval = xfs_dir2_node_addname(&args);
473 * Add a block to the directory.
475 * This routine is for data and free blocks, not leaf/node blocks which are
476 * handled by xfs_da_grow_inode.
480 struct xfs_da_args *args,
481 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
482 xfs_dir2_db_t *dbp) /* out: block number added */
484 struct xfs_inode *dp = args->dp;
485 struct xfs_mount *mp = dp->i_mount;
486 xfs_fileoff_t bno; /* directory offset of new block */
487 int count; /* count of filesystem blocks */
490 trace_xfs_dir2_grow_inode(args, space);
493 * Set lowest possible block in the space requested.
495 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
496 count = mp->m_dirblkfsbs;
498 error = xfs_da_grow_inode_int(args, &bno, count);
502 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
505 * Update file's size if this is the data space and it grew.
507 if (space == XFS_DIR2_DATA_SPACE) {
508 xfs_fsize_t size; /* directory file (data) size */
510 size = XFS_FSB_TO_B(mp, bno + count);
511 if (size > dp->i_d.di_size) {
512 dp->i_d.di_size = size;
513 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
520 * See if the directory is a single-block form directory.
526 int *vp) /* out: 1 is block, 0 is not block */
528 xfs_fileoff_t last; /* last file offset */
533 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
535 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
536 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
542 * See if the directory is a single-leaf form directory.
548 int *vp) /* out: 1 is leaf, 0 is not leaf */
550 xfs_fileoff_t last; /* last file offset */
555 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
557 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
562 * Remove the given block from the directory.
563 * This routine is used for data and free blocks, leaf/node are done
564 * by xfs_da_shrink_inode.
567 xfs_dir2_shrink_inode(
572 xfs_fileoff_t bno; /* directory file offset */
573 xfs_dablk_t da; /* directory file offset */
574 int done; /* bunmap is finished */
580 trace_xfs_dir2_shrink_inode(args, db);
585 da = xfs_dir2_db_to_da(mp, db);
587 * Unmap the fsblock(s).
589 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
590 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
593 * ENOSPC actually can happen if we're in a removename with
594 * no space reservation, and the resulting block removal
595 * would cause a bmap btree split or conversion from extents
596 * to btree. This can only happen for un-fragmented
597 * directory blocks, since you need to be punching out
598 * the middle of an extent.
599 * In this case we need to leave the block in the file,
601 * So the block has to be in a consistent empty state
602 * and appropriately logged.
603 * We don't free up the buffer, the caller can tell it
604 * hasn't happened since it got an error back.
610 * Invalidate the buffer from the transaction.
612 xfs_trans_binval(tp, bp);
614 * If it's not a data block, we're done.
616 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
619 * If the block isn't the last one in the directory, we're done.
621 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
624 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
626 * This can't really happen unless there's kernel corruption.
630 if (db == mp->m_dirdatablk)
635 * Set the size to the new last block.
637 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
638 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);