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"
35 #include "xfs_dir2_format.h"
36 #include "xfs_dir2_priv.h"
37 #include "xfs_error.h"
38 #include "xfs_vnodeops.h"
39 #include "xfs_trace.h"
41 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
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,
93 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
94 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
96 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
97 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
98 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
99 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
100 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
101 mp->m_attr_node_ents =
102 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
103 (uint)sizeof(xfs_da_node_entry_t);
104 mp->m_dir_node_ents =
105 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
106 (uint)sizeof(xfs_da_node_entry_t);
107 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
108 if (xfs_sb_version_hasasciici(&mp->m_sb))
109 mp->m_dirnameops = &xfs_ascii_ci_nameops;
111 mp->m_dirnameops = &xfs_default_nameops;
115 * Return 1 if directory contains only "." and "..".
121 xfs_dir2_sf_hdr_t *sfp;
123 ASSERT(S_ISDIR(dp->i_d.di_mode));
124 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
126 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
128 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
133 * Validate a given inode number.
136 xfs_dir_ino_validate(
140 xfs_agblock_t agblkno;
146 agno = XFS_INO_TO_AGNO(mp, ino);
147 agblkno = XFS_INO_TO_AGBNO(mp, ino);
148 ioff = XFS_INO_TO_OFFSET(mp, ino);
149 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
151 agno < mp->m_sb.sb_agcount &&
152 agblkno < mp->m_sb.sb_agblocks &&
154 ioff < (1 << mp->m_sb.sb_inopblog) &&
155 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
156 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
157 XFS_RANDOM_DIR_INO_VALIDATE))) {
158 xfs_warn(mp, "Invalid inode number 0x%Lx",
159 (unsigned long long) ino);
160 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
161 return XFS_ERROR(EFSCORRUPTED);
167 * Initialize a directory with its "." and ".." entries.
178 memset((char *)&args, 0, sizeof(args));
181 ASSERT(S_ISDIR(dp->i_d.di_mode));
182 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
184 return xfs_dir2_sf_create(&args, pdp->i_ino);
188 Enter a name in a directory.
194 struct xfs_name *name,
195 xfs_ino_t inum, /* new entry inode number */
196 xfs_fsblock_t *first, /* bmap's firstblock */
197 xfs_bmap_free_t *flist, /* bmap's freeblock list */
198 xfs_extlen_t total) /* bmap's total block count */
202 int v; /* type-checking value */
204 ASSERT(S_ISDIR(dp->i_d.di_mode));
205 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
207 XFS_STATS_INC(xs_dir_create);
209 memset(&args, 0, sizeof(xfs_da_args_t));
210 args.name = name->name;
211 args.namelen = name->len;
212 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
215 args.firstblock = first;
218 args.whichfork = XFS_DATA_FORK;
220 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
222 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
223 rval = xfs_dir2_sf_addname(&args);
224 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
227 rval = xfs_dir2_block_addname(&args);
228 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
231 rval = xfs_dir2_leaf_addname(&args);
233 rval = xfs_dir2_node_addname(&args);
238 * If doing a CI lookup and case-insensitive match, dup actual name into
239 * args.value. Return EEXIST for success (ie. name found) or an error.
242 xfs_dir_cilookup_result(
243 struct xfs_da_args *args,
244 const unsigned char *name,
247 if (args->cmpresult == XFS_CMP_DIFFERENT)
249 if (args->cmpresult != XFS_CMP_CASE ||
250 !(args->op_flags & XFS_DA_OP_CILOOKUP))
253 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
257 memcpy(args->value, name, len);
258 args->valuelen = len;
263 * Lookup a name in a directory, give back the inode number.
264 * If ci_name is not NULL, returns the actual name in ci_name if it differs
265 * to name, or ci_name->name is set to NULL for an exact match.
272 struct xfs_name *name,
273 xfs_ino_t *inum, /* out: inode number */
274 struct xfs_name *ci_name) /* out: actual name if CI match */
278 int v; /* type-checking value */
280 ASSERT(S_ISDIR(dp->i_d.di_mode));
281 XFS_STATS_INC(xs_dir_lookup);
283 memset(&args, 0, sizeof(xfs_da_args_t));
284 args.name = name->name;
285 args.namelen = name->len;
286 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
288 args.whichfork = XFS_DATA_FORK;
290 args.op_flags = XFS_DA_OP_OKNOENT;
292 args.op_flags |= XFS_DA_OP_CILOOKUP;
294 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
295 rval = xfs_dir2_sf_lookup(&args);
296 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
299 rval = xfs_dir2_block_lookup(&args);
300 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
303 rval = xfs_dir2_leaf_lookup(&args);
305 rval = xfs_dir2_node_lookup(&args);
309 *inum = args.inumber;
311 ci_name->name = args.value;
312 ci_name->len = args.valuelen;
319 * Remove an entry from a directory.
325 struct xfs_name *name,
327 xfs_fsblock_t *first, /* bmap's firstblock */
328 xfs_bmap_free_t *flist, /* bmap's freeblock list */
329 xfs_extlen_t total) /* bmap's total block count */
333 int v; /* type-checking value */
335 ASSERT(S_ISDIR(dp->i_d.di_mode));
336 XFS_STATS_INC(xs_dir_remove);
338 memset(&args, 0, sizeof(xfs_da_args_t));
339 args.name = name->name;
340 args.namelen = name->len;
341 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
344 args.firstblock = first;
347 args.whichfork = XFS_DATA_FORK;
350 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
351 rval = xfs_dir2_sf_removename(&args);
352 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
355 rval = xfs_dir2_block_removename(&args);
356 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
359 rval = xfs_dir2_leaf_removename(&args);
361 rval = xfs_dir2_node_removename(&args);
371 struct dir_context *ctx,
374 int rval; /* return value */
375 int v; /* type-checking value */
377 trace_xfs_readdir(dp);
379 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
380 return XFS_ERROR(EIO);
382 ASSERT(S_ISDIR(dp->i_d.di_mode));
383 XFS_STATS_INC(xs_dir_getdents);
385 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
386 rval = xfs_dir2_sf_getdents(dp, ctx);
387 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
390 rval = xfs_dir2_block_getdents(dp, ctx);
392 rval = xfs_dir2_leaf_getdents(dp, ctx, bufsize);
397 * Replace the inode number of a directory entry.
403 struct xfs_name *name, /* name of entry to replace */
404 xfs_ino_t inum, /* new inode number */
405 xfs_fsblock_t *first, /* bmap's firstblock */
406 xfs_bmap_free_t *flist, /* bmap's freeblock list */
407 xfs_extlen_t total) /* bmap's total block count */
411 int v; /* type-checking value */
413 ASSERT(S_ISDIR(dp->i_d.di_mode));
415 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
418 memset(&args, 0, sizeof(xfs_da_args_t));
419 args.name = name->name;
420 args.namelen = name->len;
421 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
424 args.firstblock = first;
427 args.whichfork = XFS_DATA_FORK;
430 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
431 rval = xfs_dir2_sf_replace(&args);
432 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
435 rval = xfs_dir2_block_replace(&args);
436 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
439 rval = xfs_dir2_leaf_replace(&args);
441 rval = xfs_dir2_node_replace(&args);
446 * See if this entry can be added to the directory without allocating space.
447 * First checks that the caller couldn't reserve enough space (resblks = 0).
453 struct xfs_name *name, /* name of entry to add */
458 int v; /* type-checking value */
463 ASSERT(S_ISDIR(dp->i_d.di_mode));
465 memset(&args, 0, sizeof(xfs_da_args_t));
466 args.name = name->name;
467 args.namelen = name->len;
468 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
470 args.whichfork = XFS_DATA_FORK;
472 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
475 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
476 rval = xfs_dir2_sf_addname(&args);
477 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
480 rval = xfs_dir2_block_addname(&args);
481 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
484 rval = xfs_dir2_leaf_addname(&args);
486 rval = xfs_dir2_node_addname(&args);
495 * Add a block to the directory.
497 * This routine is for data and free blocks, not leaf/node blocks which are
498 * handled by xfs_da_grow_inode.
502 struct xfs_da_args *args,
503 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
504 xfs_dir2_db_t *dbp) /* out: block number added */
506 struct xfs_inode *dp = args->dp;
507 struct xfs_mount *mp = dp->i_mount;
508 xfs_fileoff_t bno; /* directory offset of new block */
509 int count; /* count of filesystem blocks */
512 trace_xfs_dir2_grow_inode(args, space);
515 * Set lowest possible block in the space requested.
517 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
518 count = mp->m_dirblkfsbs;
520 error = xfs_da_grow_inode_int(args, &bno, count);
524 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
527 * Update file's size if this is the data space and it grew.
529 if (space == XFS_DIR2_DATA_SPACE) {
530 xfs_fsize_t size; /* directory file (data) size */
532 size = XFS_FSB_TO_B(mp, bno + count);
533 if (size > dp->i_d.di_size) {
534 dp->i_d.di_size = size;
535 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
542 * See if the directory is a single-block form directory.
548 int *vp) /* out: 1 is block, 0 is not block */
550 xfs_fileoff_t last; /* last file offset */
555 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
557 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
558 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
564 * See if the directory is a single-leaf form directory.
570 int *vp) /* out: 1 is leaf, 0 is not leaf */
572 xfs_fileoff_t last; /* last file offset */
577 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
579 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
584 * Remove the given block from the directory.
585 * This routine is used for data and free blocks, leaf/node are done
586 * by xfs_da_shrink_inode.
589 xfs_dir2_shrink_inode(
594 xfs_fileoff_t bno; /* directory file offset */
595 xfs_dablk_t da; /* directory file offset */
596 int done; /* bunmap is finished */
602 trace_xfs_dir2_shrink_inode(args, db);
607 da = xfs_dir2_db_to_da(mp, db);
609 * Unmap the fsblock(s).
611 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
612 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
615 * ENOSPC actually can happen if we're in a removename with
616 * no space reservation, and the resulting block removal
617 * would cause a bmap btree split or conversion from extents
618 * to btree. This can only happen for un-fragmented
619 * directory blocks, since you need to be punching out
620 * the middle of an extent.
621 * In this case we need to leave the block in the file,
623 * So the block has to be in a consistent empty state
624 * and appropriately logged.
625 * We don't free up the buffer, the caller can tell it
626 * hasn't happened since it got an error back.
632 * Invalidate the buffer from the transaction.
634 xfs_trans_binval(tp, bp);
636 * If it's not a data block, we're done.
638 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
641 * If the block isn't the last one in the directory, we're done.
643 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
646 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
648 * This can't really happen unless there's kernel corruption.
652 if (db == mp->m_dirdatablk)
657 * Set the size to the new last block.
659 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
660 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);