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_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_da_btree.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_inode_item.h"
39 #include "xfs_dir2_data.h"
40 #include "xfs_dir2_leaf.h"
41 #include "xfs_dir2_block.h"
42 #include "xfs_dir2_node.h"
43 #include "xfs_dir2_trace.h"
44 #include "xfs_error.h"
45 #include "xfs_vnodeops.h"
47 struct xfs_name xfs_name_dotdot = {"..", 2};
49 extern const struct xfs_nameops xfs_default_nameops;
55 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
56 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
58 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
59 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
60 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
61 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
62 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
63 mp->m_attr_node_ents =
64 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
65 (uint)sizeof(xfs_da_node_entry_t);
67 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
68 (uint)sizeof(xfs_da_node_entry_t);
69 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
70 mp->m_dirnameops = &xfs_default_nameops;
74 * Return 1 if directory contains only "." and "..".
82 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
83 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
85 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
87 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
88 return !sfp->hdr.count;
92 * Validate a given inode number.
99 xfs_agblock_t agblkno;
105 agno = XFS_INO_TO_AGNO(mp, ino);
106 agblkno = XFS_INO_TO_AGBNO(mp, ino);
107 ioff = XFS_INO_TO_OFFSET(mp, ino);
108 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
110 agno < mp->m_sb.sb_agcount &&
111 agblkno < mp->m_sb.sb_agblocks &&
113 ioff < (1 << mp->m_sb.sb_inopblog) &&
114 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
115 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
116 XFS_RANDOM_DIR_INO_VALIDATE))) {
117 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
118 (unsigned long long) ino);
119 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
120 return XFS_ERROR(EFSCORRUPTED);
126 * Initialize a directory with its "." and ".." entries.
137 memset((char *)&args, 0, sizeof(args));
140 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
141 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
143 return xfs_dir2_sf_create(&args, pdp->i_ino);
147 Enter a name in a directory.
153 struct xfs_name *name,
154 xfs_ino_t inum, /* new entry inode number */
155 xfs_fsblock_t *first, /* bmap's firstblock */
156 xfs_bmap_free_t *flist, /* bmap's freeblock list */
157 xfs_extlen_t total) /* bmap's total block count */
161 int v; /* type-checking value */
163 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
164 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
166 XFS_STATS_INC(xs_dir_create);
168 args.name = name->name;
169 args.namelen = name->len;
170 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
173 args.firstblock = first;
176 args.whichfork = XFS_DATA_FORK;
178 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
180 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
181 rval = xfs_dir2_sf_addname(&args);
182 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
185 rval = xfs_dir2_block_addname(&args);
186 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
189 rval = xfs_dir2_leaf_addname(&args);
191 rval = xfs_dir2_node_addname(&args);
196 * Lookup a name in a directory, give back the inode number.
202 struct xfs_name *name,
203 xfs_ino_t *inum) /* out: inode number */
207 int v; /* type-checking value */
209 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
210 XFS_STATS_INC(xs_dir_lookup);
211 memset(&args, 0, sizeof(xfs_da_args_t));
213 args.name = name->name;
214 args.namelen = name->len;
215 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
217 args.whichfork = XFS_DATA_FORK;
219 args.op_flags = XFS_DA_OP_OKNOENT;
220 args.cmpresult = XFS_CMP_DIFFERENT;
222 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
223 rval = xfs_dir2_sf_lookup(&args);
224 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
227 rval = xfs_dir2_block_lookup(&args);
228 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
231 rval = xfs_dir2_leaf_lookup(&args);
233 rval = xfs_dir2_node_lookup(&args);
237 *inum = args.inumber;
242 * Remove an entry from a directory.
248 struct xfs_name *name,
250 xfs_fsblock_t *first, /* bmap's firstblock */
251 xfs_bmap_free_t *flist, /* bmap's freeblock list */
252 xfs_extlen_t total) /* bmap's total block count */
256 int v; /* type-checking value */
258 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
259 XFS_STATS_INC(xs_dir_remove);
261 args.name = name->name;
262 args.namelen = name->len;
263 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
266 args.firstblock = first;
269 args.whichfork = XFS_DATA_FORK;
273 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
274 rval = xfs_dir2_sf_removename(&args);
275 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
278 rval = xfs_dir2_block_removename(&args);
279 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
282 rval = xfs_dir2_leaf_removename(&args);
284 rval = xfs_dir2_node_removename(&args);
299 int rval; /* return value */
300 int v; /* type-checking value */
302 xfs_itrace_entry(dp);
304 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
305 return XFS_ERROR(EIO);
307 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
308 XFS_STATS_INC(xs_dir_getdents);
310 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
311 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
312 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
315 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
317 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
323 * Replace the inode number of a directory entry.
329 struct xfs_name *name, /* name of entry to replace */
330 xfs_ino_t inum, /* new inode number */
331 xfs_fsblock_t *first, /* bmap's firstblock */
332 xfs_bmap_free_t *flist, /* bmap's freeblock list */
333 xfs_extlen_t total) /* bmap's total block count */
337 int v; /* type-checking value */
339 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
341 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
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;
356 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
357 rval = xfs_dir2_sf_replace(&args);
358 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
361 rval = xfs_dir2_block_replace(&args);
362 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
365 rval = xfs_dir2_leaf_replace(&args);
367 rval = xfs_dir2_node_replace(&args);
372 * See if this entry can be added to the directory without allocating space.
373 * First checks that the caller couldn't reserve enough space (resblks = 0).
379 struct xfs_name *name, /* name of entry to add */
384 int v; /* type-checking value */
389 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
390 memset(&args, 0, sizeof(xfs_da_args_t));
392 args.name = name->name;
393 args.namelen = name->len;
394 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
396 args.whichfork = XFS_DATA_FORK;
398 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
401 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
402 rval = xfs_dir2_sf_addname(&args);
403 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
406 rval = xfs_dir2_block_addname(&args);
407 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
410 rval = xfs_dir2_leaf_addname(&args);
412 rval = xfs_dir2_node_addname(&args);
421 * Add a block to the directory.
422 * This routine is for data and free blocks, not leaf/node blocks
423 * which are handled by xfs_da_grow_inode.
428 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
429 xfs_dir2_db_t *dbp) /* out: block number added */
431 xfs_fileoff_t bno; /* directory offset of new block */
432 int count; /* count of filesystem blocks */
433 xfs_inode_t *dp; /* incore directory inode */
435 int got; /* blocks actually mapped */
437 xfs_bmbt_irec_t map; /* single structure for bmap */
438 int mapi; /* mapping index */
439 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
441 int nmap; /* number of bmap entries */
444 xfs_dir2_trace_args_s("grow_inode", args, space);
449 * Set lowest possible block in the space requested.
451 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
452 count = mp->m_dirblkfsbs;
454 * Find the first hole for our block.
456 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
459 ASSERT(args->firstblock != NULL);
461 * Try mapping the new block contiguously (one extent).
463 if ((error = xfs_bmapi(tp, dp, bno, count,
464 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
465 args->firstblock, args->total, &map, &nmap,
474 * Didn't work and this is a multiple-fsb directory block.
475 * Try again with contiguous flag turned on.
477 else if (nmap == 0 && count > 1) {
478 xfs_fileoff_t b; /* current file offset */
481 * Space for maximum number of mappings.
483 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
485 * Iterate until we get to the end of our block.
487 for (b = bno, mapi = 0; b < bno + count; ) {
488 int c; /* current fsb count */
491 * Can't map more than MAX_NMAP at once.
493 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
494 c = (int)(bno + count - b);
495 if ((error = xfs_bmapi(tp, dp, b, c,
496 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
497 args->firstblock, args->total,
498 &mapp[mapi], &nmap, args->flist,
506 * Add this bunch into our table, go to the next offset.
509 b = mapp[mapi - 1].br_startoff +
510 mapp[mapi - 1].br_blockcount;
521 * See how many fsb's we got.
523 for (i = 0, got = 0; i < mapi; i++)
524 got += mapp[i].br_blockcount;
526 * Didn't get enough fsb's, or the first/last block's are wrong.
528 if (got != count || mapp[0].br_startoff != bno ||
529 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
533 return XFS_ERROR(ENOSPC);
536 * Done with the temporary mapping table.
540 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
542 * Update file's size if this is the data space and it grew.
544 if (space == XFS_DIR2_DATA_SPACE) {
545 xfs_fsize_t size; /* directory file (data) size */
547 size = XFS_FSB_TO_B(mp, bno + count);
548 if (size > dp->i_d.di_size) {
549 dp->i_d.di_size = size;
550 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
557 * See if the directory is a single-block form directory.
563 int *vp) /* out: 1 is block, 0 is not block */
565 xfs_fileoff_t last; /* last file offset */
570 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
572 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
573 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
579 * See if the directory is a single-leaf form directory.
585 int *vp) /* out: 1 is leaf, 0 is not leaf */
587 xfs_fileoff_t last; /* last file offset */
592 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
594 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
599 * Remove the given block from the directory.
600 * This routine is used for data and free blocks, leaf/node are done
601 * by xfs_da_shrink_inode.
604 xfs_dir2_shrink_inode(
609 xfs_fileoff_t bno; /* directory file offset */
610 xfs_dablk_t da; /* directory file offset */
611 int done; /* bunmap is finished */
617 xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
621 da = xfs_dir2_db_to_da(mp, db);
623 * Unmap the fsblock(s).
625 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
626 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
629 * ENOSPC actually can happen if we're in a removename with
630 * no space reservation, and the resulting block removal
631 * would cause a bmap btree split or conversion from extents
632 * to btree. This can only happen for un-fragmented
633 * directory blocks, since you need to be punching out
634 * the middle of an extent.
635 * In this case we need to leave the block in the file,
637 * So the block has to be in a consistent empty state
638 * and appropriately logged.
639 * We don't free up the buffer, the caller can tell it
640 * hasn't happened since it got an error back.
646 * Invalidate the buffer from the transaction.
648 xfs_da_binval(tp, bp);
650 * If it's not a data block, we're done.
652 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
655 * If the block isn't the last one in the directory, we're done.
657 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
660 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
662 * This can't really happen unless there's kernel corruption.
666 if (db == mp->m_dirdatablk)
671 * Set the size to the new last block.
673 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
674 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);