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,
95 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
96 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
98 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
99 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
100 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
101 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
102 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
104 nodehdr_size = __xfs_da3_node_hdr_size(xfs_sb_version_hascrc(&mp->m_sb));
105 mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
106 (uint)sizeof(xfs_da_node_entry_t);
107 mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
108 (uint)sizeof(xfs_da_node_entry_t);
110 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
111 if (xfs_sb_version_hasasciici(&mp->m_sb))
112 mp->m_dirnameops = &xfs_ascii_ci_nameops;
114 mp->m_dirnameops = &xfs_default_nameops;
118 * Return 1 if directory contains only "." and "..".
124 xfs_dir2_sf_hdr_t *sfp;
126 ASSERT(S_ISDIR(dp->i_d.di_mode));
127 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
129 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
131 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
136 * Validate a given inode number.
139 xfs_dir_ino_validate(
143 xfs_agblock_t agblkno;
149 agno = XFS_INO_TO_AGNO(mp, ino);
150 agblkno = XFS_INO_TO_AGBNO(mp, ino);
151 ioff = XFS_INO_TO_OFFSET(mp, ino);
152 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
154 agno < mp->m_sb.sb_agcount &&
155 agblkno < mp->m_sb.sb_agblocks &&
157 ioff < (1 << mp->m_sb.sb_inopblog) &&
158 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
159 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
160 XFS_RANDOM_DIR_INO_VALIDATE))) {
161 xfs_warn(mp, "Invalid inode number 0x%Lx",
162 (unsigned long long) ino);
163 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
164 return XFS_ERROR(EFSCORRUPTED);
170 * Initialize a directory with its "." and ".." entries.
181 memset((char *)&args, 0, sizeof(args));
184 ASSERT(S_ISDIR(dp->i_d.di_mode));
185 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
187 return xfs_dir2_sf_create(&args, pdp->i_ino);
191 Enter a name in a directory.
197 struct xfs_name *name,
198 xfs_ino_t inum, /* new entry inode number */
199 xfs_fsblock_t *first, /* bmap's firstblock */
200 xfs_bmap_free_t *flist, /* bmap's freeblock list */
201 xfs_extlen_t total) /* bmap's total block count */
205 int v; /* type-checking value */
207 ASSERT(S_ISDIR(dp->i_d.di_mode));
208 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
210 XFS_STATS_INC(xs_dir_create);
212 memset(&args, 0, sizeof(xfs_da_args_t));
213 args.name = name->name;
214 args.namelen = name->len;
215 args.filetype = name->type;
216 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
219 args.firstblock = first;
222 args.whichfork = XFS_DATA_FORK;
224 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
226 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
227 rval = xfs_dir2_sf_addname(&args);
228 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
231 rval = xfs_dir2_block_addname(&args);
232 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
235 rval = xfs_dir2_leaf_addname(&args);
237 rval = xfs_dir2_node_addname(&args);
242 * If doing a CI lookup and case-insensitive match, dup actual name into
243 * args.value. Return EEXIST for success (ie. name found) or an error.
246 xfs_dir_cilookup_result(
247 struct xfs_da_args *args,
248 const unsigned char *name,
251 if (args->cmpresult == XFS_CMP_DIFFERENT)
253 if (args->cmpresult != XFS_CMP_CASE ||
254 !(args->op_flags & XFS_DA_OP_CILOOKUP))
257 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
261 memcpy(args->value, name, len);
262 args->valuelen = len;
267 * Lookup a name in a directory, give back the inode number.
268 * If ci_name is not NULL, returns the actual name in ci_name if it differs
269 * to name, or ci_name->name is set to NULL for an exact match.
276 struct xfs_name *name,
277 xfs_ino_t *inum, /* out: inode number */
278 struct xfs_name *ci_name) /* out: actual name if CI match */
282 int v; /* type-checking value */
284 ASSERT(S_ISDIR(dp->i_d.di_mode));
285 XFS_STATS_INC(xs_dir_lookup);
287 memset(&args, 0, sizeof(xfs_da_args_t));
288 args.name = name->name;
289 args.namelen = name->len;
290 args.filetype = name->type;
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(S_ISDIR(dp->i_d.di_mode));
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.filetype = name->type;
347 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
350 args.firstblock = first;
353 args.whichfork = XFS_DATA_FORK;
356 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
357 rval = xfs_dir2_sf_removename(&args);
358 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
361 rval = xfs_dir2_block_removename(&args);
362 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
365 rval = xfs_dir2_leaf_removename(&args);
367 rval = xfs_dir2_node_removename(&args);
372 * Replace the inode number of a directory entry.
378 struct xfs_name *name, /* name of entry to replace */
379 xfs_ino_t inum, /* new inode number */
380 xfs_fsblock_t *first, /* bmap's firstblock */
381 xfs_bmap_free_t *flist, /* bmap's freeblock list */
382 xfs_extlen_t total) /* bmap's total block count */
386 int v; /* type-checking value */
388 ASSERT(S_ISDIR(dp->i_d.di_mode));
390 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
393 memset(&args, 0, sizeof(xfs_da_args_t));
394 args.name = name->name;
395 args.namelen = name->len;
396 args.filetype = name->type;
397 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
400 args.firstblock = first;
403 args.whichfork = XFS_DATA_FORK;
406 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
407 rval = xfs_dir2_sf_replace(&args);
408 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
411 rval = xfs_dir2_block_replace(&args);
412 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
415 rval = xfs_dir2_leaf_replace(&args);
417 rval = xfs_dir2_node_replace(&args);
422 * See if this entry can be added to the directory without allocating space.
423 * First checks that the caller couldn't reserve enough space (resblks = 0).
429 struct xfs_name *name, /* name of entry to add */
434 int v; /* type-checking value */
439 ASSERT(S_ISDIR(dp->i_d.di_mode));
441 memset(&args, 0, sizeof(xfs_da_args_t));
442 args.name = name->name;
443 args.namelen = name->len;
444 args.filetype = name->type;
445 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
447 args.whichfork = XFS_DATA_FORK;
449 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
452 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
453 rval = xfs_dir2_sf_addname(&args);
454 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
457 rval = xfs_dir2_block_addname(&args);
458 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
461 rval = xfs_dir2_leaf_addname(&args);
463 rval = xfs_dir2_node_addname(&args);
472 * Add a block to the directory.
474 * This routine is for data and free blocks, not leaf/node blocks which are
475 * handled by xfs_da_grow_inode.
479 struct xfs_da_args *args,
480 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
481 xfs_dir2_db_t *dbp) /* out: block number added */
483 struct xfs_inode *dp = args->dp;
484 struct xfs_mount *mp = dp->i_mount;
485 xfs_fileoff_t bno; /* directory offset of new block */
486 int count; /* count of filesystem blocks */
489 trace_xfs_dir2_grow_inode(args, space);
492 * Set lowest possible block in the space requested.
494 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
495 count = mp->m_dirblkfsbs;
497 error = xfs_da_grow_inode_int(args, &bno, count);
501 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
504 * Update file's size if this is the data space and it grew.
506 if (space == XFS_DIR2_DATA_SPACE) {
507 xfs_fsize_t size; /* directory file (data) size */
509 size = XFS_FSB_TO_B(mp, bno + count);
510 if (size > dp->i_d.di_size) {
511 dp->i_d.di_size = size;
512 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
519 * See if the directory is a single-block form directory.
525 int *vp) /* out: 1 is block, 0 is not block */
527 xfs_fileoff_t last; /* last file offset */
532 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
534 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
535 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
541 * See if the directory is a single-leaf form directory.
547 int *vp) /* out: 1 is leaf, 0 is not leaf */
549 xfs_fileoff_t last; /* last file offset */
554 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
556 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
561 * Remove the given block from the directory.
562 * This routine is used for data and free blocks, leaf/node are done
563 * by xfs_da_shrink_inode.
566 xfs_dir2_shrink_inode(
571 xfs_fileoff_t bno; /* directory file offset */
572 xfs_dablk_t da; /* directory file offset */
573 int done; /* bunmap is finished */
579 trace_xfs_dir2_shrink_inode(args, db);
584 da = xfs_dir2_db_to_da(mp, db);
586 * Unmap the fsblock(s).
588 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
589 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
592 * ENOSPC actually can happen if we're in a removename with
593 * no space reservation, and the resulting block removal
594 * would cause a bmap btree split or conversion from extents
595 * to btree. This can only happen for un-fragmented
596 * directory blocks, since you need to be punching out
597 * the middle of an extent.
598 * In this case we need to leave the block in the file,
600 * So the block has to be in a consistent empty state
601 * and appropriately logged.
602 * We don't free up the buffer, the caller can tell it
603 * hasn't happened since it got an error back.
609 * Invalidate the buffer from the transaction.
611 xfs_trans_binval(tp, bp);
613 * If it's not a data block, we're done.
615 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
618 * If the block isn't the last one in the directory, we're done.
620 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
623 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
625 * This can't really happen unless there's kernel corruption.
629 if (db == mp->m_dirdatablk)
634 * Set the size to the new last block.
636 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
637 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);