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[XFS] use filldir internally
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1da177e4 1/*
7b718769
NS
2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
1da177e4 4 *
7b718769
NS
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
1da177e4
LT
7 * published by the Free Software Foundation.
8 *
7b718769
NS
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.
1da177e4 13 *
7b718769
NS
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
1da177e4 17 */
1da177e4 18#include "xfs.h"
a844f451 19#include "xfs_fs.h"
1da177e4 20#include "xfs_types.h"
a844f451 21#include "xfs_bit.h"
1da177e4 22#include "xfs_log.h"
a844f451 23#include "xfs_inum.h"
1da177e4
LT
24#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
1da177e4
LT
27#include "xfs_dir2.h"
28#include "xfs_dmapi.h"
29#include "xfs_mount.h"
a844f451 30#include "xfs_da_btree.h"
1da177e4 31#include "xfs_bmap_btree.h"
a844f451 32#include "xfs_alloc_btree.h"
1da177e4 33#include "xfs_dir2_sf.h"
a844f451 34#include "xfs_attr_sf.h"
1da177e4 35#include "xfs_dinode.h"
1da177e4 36#include "xfs_inode.h"
a844f451 37#include "xfs_inode_item.h"
1da177e4 38#include "xfs_bmap.h"
1da177e4
LT
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"
1da177e4 45
1da177e4 46
f6c2d1fa
NS
47void
48xfs_dir_mount(
49 xfs_mount_t *mp)
1da177e4 50{
f6c2d1fa 51 ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
1da177e4
LT
52 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
53 XFS_MAX_BLOCKSIZE);
54 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
55 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
bbaaf538
CH
56 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
57 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
58 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
1da177e4
LT
59 mp->m_attr_node_ents =
60 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
61 (uint)sizeof(xfs_da_node_entry_t);
62 mp->m_dir_node_ents =
63 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
64 (uint)sizeof(xfs_da_node_entry_t);
65 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
66}
67
68/*
69 * Return 1 if directory contains only "." and "..".
70 */
f6c2d1fa
NS
71int
72xfs_dir_isempty(
73 xfs_inode_t *dp)
1da177e4 74{
f6c2d1fa 75 xfs_dir2_sf_t *sfp;
1da177e4
LT
76
77 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa 78 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
1da177e4 79 return 1;
1da177e4
LT
80 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
81 return 0;
82 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
83 return !sfp->hdr.count;
84}
85
f6c2d1fa
NS
86/*
87 * Validate a given inode number.
88 */
89int
90xfs_dir_ino_validate(
91 xfs_mount_t *mp,
92 xfs_ino_t ino)
93{
94 xfs_agblock_t agblkno;
95 xfs_agino_t agino;
96 xfs_agnumber_t agno;
97 int ino_ok;
98 int ioff;
99
100 agno = XFS_INO_TO_AGNO(mp, ino);
101 agblkno = XFS_INO_TO_AGBNO(mp, ino);
102 ioff = XFS_INO_TO_OFFSET(mp, ino);
103 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
104 ino_ok =
105 agno < mp->m_sb.sb_agcount &&
106 agblkno < mp->m_sb.sb_agblocks &&
107 agblkno != 0 &&
108 ioff < (1 << mp->m_sb.sb_inopblog) &&
109 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
110 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
111 XFS_RANDOM_DIR_INO_VALIDATE))) {
112 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
113 (unsigned long long) ino);
114 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
115 return XFS_ERROR(EFSCORRUPTED);
116 }
117 return 0;
118}
119
1da177e4
LT
120/*
121 * Initialize a directory with its "." and ".." entries.
122 */
f6c2d1fa
NS
123int
124xfs_dir_init(
125 xfs_trans_t *tp,
126 xfs_inode_t *dp,
127 xfs_inode_t *pdp)
1da177e4 128{
f6c2d1fa
NS
129 xfs_da_args_t args;
130 int error;
1da177e4
LT
131
132 memset((char *)&args, 0, sizeof(args));
133 args.dp = dp;
134 args.trans = tp;
135 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa 136 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
1da177e4 137 return error;
1da177e4
LT
138 return xfs_dir2_sf_create(&args, pdp->i_ino);
139}
140
141/*
142 Enter a name in a directory.
143 */
f6c2d1fa
NS
144int
145xfs_dir_createname(
146 xfs_trans_t *tp,
147 xfs_inode_t *dp,
148 char *name,
149 int namelen,
1da177e4
LT
150 xfs_ino_t inum, /* new entry inode number */
151 xfs_fsblock_t *first, /* bmap's firstblock */
152 xfs_bmap_free_t *flist, /* bmap's freeblock list */
153 xfs_extlen_t total) /* bmap's total block count */
154{
f6c2d1fa
NS
155 xfs_da_args_t args;
156 int rval;
1da177e4
LT
157 int v; /* type-checking value */
158
159 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa 160 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4 161 return rval;
1da177e4 162 XFS_STATS_INC(xs_dir_create);
f6c2d1fa 163
1da177e4
LT
164 args.name = name;
165 args.namelen = namelen;
166 args.hashval = xfs_da_hashname(name, namelen);
167 args.inumber = inum;
168 args.dp = dp;
169 args.firstblock = first;
170 args.flist = flist;
171 args.total = total;
172 args.whichfork = XFS_DATA_FORK;
173 args.trans = tp;
174 args.justcheck = 0;
175 args.addname = args.oknoent = 1;
f6c2d1fa 176
1da177e4
LT
177 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
178 rval = xfs_dir2_sf_addname(&args);
f6c2d1fa 179 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4 180 return rval;
f6c2d1fa 181 else if (v)
1da177e4 182 rval = xfs_dir2_block_addname(&args);
f6c2d1fa 183 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4 184 return rval;
f6c2d1fa 185 else if (v)
1da177e4
LT
186 rval = xfs_dir2_leaf_addname(&args);
187 else
188 rval = xfs_dir2_node_addname(&args);
189 return rval;
190}
191
192/*
193 * Lookup a name in a directory, give back the inode number.
194 */
f6c2d1fa
NS
195int
196xfs_dir_lookup(
197 xfs_trans_t *tp,
198 xfs_inode_t *dp,
199 char *name,
200 int namelen,
1da177e4
LT
201 xfs_ino_t *inum) /* out: inode number */
202{
f6c2d1fa
NS
203 xfs_da_args_t args;
204 int rval;
1da177e4
LT
205 int v; /* type-checking value */
206
207 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
208 XFS_STATS_INC(xs_dir_lookup);
209
1da177e4
LT
210 args.name = name;
211 args.namelen = namelen;
212 args.hashval = xfs_da_hashname(name, namelen);
213 args.inumber = 0;
214 args.dp = dp;
215 args.firstblock = NULL;
216 args.flist = NULL;
217 args.total = 0;
218 args.whichfork = XFS_DATA_FORK;
219 args.trans = tp;
220 args.justcheck = args.addname = 0;
221 args.oknoent = 1;
f6c2d1fa 222
1da177e4
LT
223 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
224 rval = xfs_dir2_sf_lookup(&args);
f6c2d1fa 225 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4 226 return rval;
f6c2d1fa 227 else if (v)
1da177e4 228 rval = xfs_dir2_block_lookup(&args);
f6c2d1fa 229 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4 230 return rval;
f6c2d1fa 231 else if (v)
1da177e4
LT
232 rval = xfs_dir2_leaf_lookup(&args);
233 else
234 rval = xfs_dir2_node_lookup(&args);
235 if (rval == EEXIST)
236 rval = 0;
237 if (rval == 0)
238 *inum = args.inumber;
239 return rval;
240}
241
242/*
243 * Remove an entry from a directory.
244 */
f6c2d1fa
NS
245int
246xfs_dir_removename(
247 xfs_trans_t *tp,
248 xfs_inode_t *dp,
249 char *name,
250 int namelen,
251 xfs_ino_t ino,
1da177e4
LT
252 xfs_fsblock_t *first, /* bmap's firstblock */
253 xfs_bmap_free_t *flist, /* bmap's freeblock list */
254 xfs_extlen_t total) /* bmap's total block count */
255{
f6c2d1fa
NS
256 xfs_da_args_t args;
257 int rval;
1da177e4
LT
258 int v; /* type-checking value */
259
260 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
261 XFS_STATS_INC(xs_dir_remove);
f6c2d1fa 262
1da177e4
LT
263 args.name = name;
264 args.namelen = namelen;
265 args.hashval = xfs_da_hashname(name, namelen);
266 args.inumber = ino;
267 args.dp = dp;
268 args.firstblock = first;
269 args.flist = flist;
270 args.total = total;
271 args.whichfork = XFS_DATA_FORK;
272 args.trans = tp;
273 args.justcheck = args.addname = args.oknoent = 0;
f6c2d1fa 274
1da177e4
LT
275 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
276 rval = xfs_dir2_sf_removename(&args);
f6c2d1fa 277 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4 278 return rval;
f6c2d1fa 279 else if (v)
1da177e4 280 rval = xfs_dir2_block_removename(&args);
f6c2d1fa 281 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4 282 return rval;
f6c2d1fa 283 else if (v)
1da177e4
LT
284 rval = xfs_dir2_leaf_removename(&args);
285 else
286 rval = xfs_dir2_node_removename(&args);
287 return rval;
288}
289
290/*
291 * Read a directory.
292 */
f6c2d1fa 293int
051e7cd4
CH
294xfs_readdir(
295 bhv_desc_t *dir_bdp,
296 void *dirent,
297 size_t bufsize,
298 xfs_off_t *offset,
299 filldir_t filldir)
1da177e4 300{
051e7cd4 301 xfs_inode_t *dp = XFS_BHVTOI(dir_bdp);
1da177e4
LT
302 int rval; /* return value */
303 int v; /* type-checking value */
304
051e7cd4
CH
305 vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__,
306 (inst_t *)__return_address);
307
308 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
309 return XFS_ERROR(EIO);
310
1da177e4
LT
311 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
312 XFS_STATS_INC(xs_dir_getdents);
1da177e4 313
1da177e4 314 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
051e7cd4
CH
315 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
316 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
1da177e4 317 ;
f6c2d1fa 318 else if (v)
051e7cd4 319 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
1da177e4 320 else
051e7cd4
CH
321 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
322 filldir);
1da177e4
LT
323 return rval;
324}
325
326/*
327 * Replace the inode number of a directory entry.
328 */
f6c2d1fa
NS
329int
330xfs_dir_replace(
331 xfs_trans_t *tp,
332 xfs_inode_t *dp,
1da177e4 333 char *name, /* name of entry to replace */
f6c2d1fa 334 int namelen,
1da177e4
LT
335 xfs_ino_t inum, /* new inode number */
336 xfs_fsblock_t *first, /* bmap's firstblock */
337 xfs_bmap_free_t *flist, /* bmap's freeblock list */
338 xfs_extlen_t total) /* bmap's total block count */
339{
f6c2d1fa
NS
340 xfs_da_args_t args;
341 int rval;
1da177e4
LT
342 int v; /* type-checking value */
343
344 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
345
f6c2d1fa 346 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
1da177e4 347 return rval;
f6c2d1fa 348
1da177e4
LT
349 args.name = name;
350 args.namelen = namelen;
351 args.hashval = xfs_da_hashname(name, namelen);
352 args.inumber = inum;
353 args.dp = dp;
354 args.firstblock = first;
355 args.flist = flist;
356 args.total = total;
357 args.whichfork = XFS_DATA_FORK;
358 args.trans = tp;
359 args.justcheck = args.addname = args.oknoent = 0;
f6c2d1fa 360
1da177e4
LT
361 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
362 rval = xfs_dir2_sf_replace(&args);
f6c2d1fa 363 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4 364 return rval;
f6c2d1fa 365 else if (v)
1da177e4 366 rval = xfs_dir2_block_replace(&args);
f6c2d1fa 367 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4 368 return rval;
f6c2d1fa 369 else if (v)
1da177e4
LT
370 rval = xfs_dir2_leaf_replace(&args);
371 else
372 rval = xfs_dir2_node_replace(&args);
373 return rval;
374}
375
376/*
377 * See if this entry can be added to the directory without allocating space.
378 */
f6c2d1fa
NS
379int
380xfs_dir_canenter(
381 xfs_trans_t *tp,
382 xfs_inode_t *dp,
1da177e4 383 char *name, /* name of entry to add */
f6c2d1fa 384 int namelen)
1da177e4 385{
f6c2d1fa
NS
386 xfs_da_args_t args;
387 int rval;
1da177e4
LT
388 int v; /* type-checking value */
389
390 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
f6c2d1fa 391
1da177e4
LT
392 args.name = name;
393 args.namelen = namelen;
394 args.hashval = xfs_da_hashname(name, namelen);
395 args.inumber = 0;
396 args.dp = dp;
397 args.firstblock = NULL;
398 args.flist = NULL;
399 args.total = 0;
400 args.whichfork = XFS_DATA_FORK;
401 args.trans = tp;
402 args.justcheck = args.addname = args.oknoent = 1;
f6c2d1fa 403
1da177e4
LT
404 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
405 rval = xfs_dir2_sf_addname(&args);
f6c2d1fa 406 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
1da177e4 407 return rval;
f6c2d1fa 408 else if (v)
1da177e4 409 rval = xfs_dir2_block_addname(&args);
f6c2d1fa 410 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
1da177e4 411 return rval;
f6c2d1fa 412 else if (v)
1da177e4
LT
413 rval = xfs_dir2_leaf_addname(&args);
414 else
415 rval = xfs_dir2_node_addname(&args);
416 return rval;
417}
418
1da177e4
LT
419/*
420 * Utility routines.
421 */
422
423/*
424 * Add a block to the directory.
425 * This routine is for data and free blocks, not leaf/node blocks
426 * which are handled by xfs_da_grow_inode.
427 */
f6c2d1fa 428int
1da177e4 429xfs_dir2_grow_inode(
f6c2d1fa 430 xfs_da_args_t *args,
1da177e4
LT
431 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
432 xfs_dir2_db_t *dbp) /* out: block number added */
433{
434 xfs_fileoff_t bno; /* directory offset of new block */
435 int count; /* count of filesystem blocks */
436 xfs_inode_t *dp; /* incore directory inode */
f6c2d1fa 437 int error;
1da177e4 438 int got; /* blocks actually mapped */
f6c2d1fa 439 int i;
1da177e4
LT
440 xfs_bmbt_irec_t map; /* single structure for bmap */
441 int mapi; /* mapping index */
442 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
f6c2d1fa 443 xfs_mount_t *mp;
1da177e4 444 int nmap; /* number of bmap entries */
f6c2d1fa 445 xfs_trans_t *tp;
1da177e4
LT
446
447 xfs_dir2_trace_args_s("grow_inode", args, space);
448 dp = args->dp;
449 tp = args->trans;
450 mp = dp->i_mount;
451 /*
452 * Set lowest possible block in the space requested.
453 */
454 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
455 count = mp->m_dirblkfsbs;
456 /*
457 * Find the first hole for our block.
458 */
f6c2d1fa 459 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
1da177e4 460 return error;
1da177e4
LT
461 nmap = 1;
462 ASSERT(args->firstblock != NULL);
463 /*
464 * Try mapping the new block contiguously (one extent).
465 */
466 if ((error = xfs_bmapi(tp, dp, bno, count,
467 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
468 args->firstblock, args->total, &map, &nmap,
f6c2d1fa 469 args->flist, NULL)))
1da177e4 470 return error;
1da177e4 471 ASSERT(nmap <= 1);
1da177e4
LT
472 if (nmap == 1) {
473 mapp = &map;
474 mapi = 1;
475 }
476 /*
477 * Didn't work and this is a multiple-fsb directory block.
478 * Try again with contiguous flag turned on.
479 */
480 else if (nmap == 0 && count > 1) {
481 xfs_fileoff_t b; /* current file offset */
482
483 /*
484 * Space for maximum number of mappings.
485 */
486 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
487 /*
488 * Iterate until we get to the end of our block.
489 */
490 for (b = bno, mapi = 0; b < bno + count; ) {
491 int c; /* current fsb count */
492
493 /*
494 * Can't map more than MAX_NMAP at once.
495 */
496 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
497 c = (int)(bno + count - b);
498 if ((error = xfs_bmapi(tp, dp, b, c,
499 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
500 args->firstblock, args->total,
3e57ecf6
OW
501 &mapp[mapi], &nmap, args->flist,
502 NULL))) {
1da177e4
LT
503 kmem_free(mapp, sizeof(*mapp) * count);
504 return error;
505 }
506 if (nmap < 1)
507 break;
508 /*
509 * Add this bunch into our table, go to the next offset.
510 */
511 mapi += nmap;
512 b = mapp[mapi - 1].br_startoff +
513 mapp[mapi - 1].br_blockcount;
514 }
515 }
516 /*
517 * Didn't work.
518 */
519 else {
520 mapi = 0;
521 mapp = NULL;
522 }
523 /*
524 * See how many fsb's we got.
525 */
526 for (i = 0, got = 0; i < mapi; i++)
527 got += mapp[i].br_blockcount;
528 /*
529 * Didn't get enough fsb's, or the first/last block's are wrong.
530 */
531 if (got != count || mapp[0].br_startoff != bno ||
532 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
533 bno + count) {
534 if (mapp != &map)
535 kmem_free(mapp, sizeof(*mapp) * count);
536 return XFS_ERROR(ENOSPC);
537 }
538 /*
539 * Done with the temporary mapping table.
540 */
541 if (mapp != &map)
542 kmem_free(mapp, sizeof(*mapp) * count);
bbaaf538 543 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
1da177e4
LT
544 /*
545 * Update file's size if this is the data space and it grew.
546 */
547 if (space == XFS_DIR2_DATA_SPACE) {
548 xfs_fsize_t size; /* directory file (data) size */
549
550 size = XFS_FSB_TO_B(mp, bno + count);
551 if (size > dp->i_d.di_size) {
552 dp->i_d.di_size = size;
553 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
554 }
555 }
556 return 0;
557}
558
559/*
560 * See if the directory is a single-block form directory.
561 */
f6c2d1fa 562int
1da177e4 563xfs_dir2_isblock(
f6c2d1fa
NS
564 xfs_trans_t *tp,
565 xfs_inode_t *dp,
1da177e4
LT
566 int *vp) /* out: 1 is block, 0 is not block */
567{
568 xfs_fileoff_t last; /* last file offset */
f6c2d1fa
NS
569 xfs_mount_t *mp;
570 int rval;
1da177e4
LT
571
572 mp = dp->i_mount;
f6c2d1fa 573 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
1da177e4 574 return rval;
1da177e4
LT
575 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
576 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
577 *vp = rval;
578 return 0;
579}
580
581/*
582 * See if the directory is a single-leaf form directory.
583 */
f6c2d1fa 584int
1da177e4 585xfs_dir2_isleaf(
f6c2d1fa
NS
586 xfs_trans_t *tp,
587 xfs_inode_t *dp,
1da177e4
LT
588 int *vp) /* out: 1 is leaf, 0 is not leaf */
589{
590 xfs_fileoff_t last; /* last file offset */
f6c2d1fa
NS
591 xfs_mount_t *mp;
592 int rval;
1da177e4
LT
593
594 mp = dp->i_mount;
f6c2d1fa 595 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
1da177e4 596 return rval;
1da177e4
LT
597 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
598 return 0;
599}
600
1da177e4
LT
601/*
602 * Remove the given block from the directory.
603 * This routine is used for data and free blocks, leaf/node are done
604 * by xfs_da_shrink_inode.
605 */
606int
607xfs_dir2_shrink_inode(
f6c2d1fa
NS
608 xfs_da_args_t *args,
609 xfs_dir2_db_t db,
610 xfs_dabuf_t *bp)
1da177e4
LT
611{
612 xfs_fileoff_t bno; /* directory file offset */
613 xfs_dablk_t da; /* directory file offset */
614 int done; /* bunmap is finished */
f6c2d1fa
NS
615 xfs_inode_t *dp;
616 int error;
617 xfs_mount_t *mp;
618 xfs_trans_t *tp;
1da177e4
LT
619
620 xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
621 dp = args->dp;
622 mp = dp->i_mount;
623 tp = args->trans;
bbaaf538 624 da = xfs_dir2_db_to_da(mp, db);
1da177e4
LT
625 /*
626 * Unmap the fsblock(s).
627 */
628 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
629 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
3e57ecf6 630 NULL, &done))) {
1da177e4
LT
631 /*
632 * ENOSPC actually can happen if we're in a removename with
633 * no space reservation, and the resulting block removal
634 * would cause a bmap btree split or conversion from extents
635 * to btree. This can only happen for un-fragmented
636 * directory blocks, since you need to be punching out
637 * the middle of an extent.
638 * In this case we need to leave the block in the file,
639 * and not binval it.
640 * So the block has to be in a consistent empty state
641 * and appropriately logged.
642 * We don't free up the buffer, the caller can tell it
643 * hasn't happened since it got an error back.
644 */
645 return error;
646 }
647 ASSERT(done);
648 /*
649 * Invalidate the buffer from the transaction.
650 */
651 xfs_da_binval(tp, bp);
652 /*
653 * If it's not a data block, we're done.
654 */
655 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
656 return 0;
657 /*
658 * If the block isn't the last one in the directory, we're done.
659 */
bbaaf538 660 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
1da177e4
LT
661 return 0;
662 bno = da;
663 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
664 /*
665 * This can't really happen unless there's kernel corruption.
666 */
667 return error;
668 }
669 if (db == mp->m_dirdatablk)
670 ASSERT(bno == 0);
671 else
672 ASSERT(bno > 0);
673 /*
674 * Set the size to the new last block.
675 */
676 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
677 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
678 return 0;
679}