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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[deliverable/linux.git] / fs / xfs / libxfs / xfs_dir2.c
1 /*
2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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.
8 *
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.
13 *
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
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_format.h"
21 #include "xfs_log_format.h"
22 #include "xfs_trans_resv.h"
23 #include "xfs_mount.h"
24 #include "xfs_da_format.h"
25 #include "xfs_da_btree.h"
26 #include "xfs_inode.h"
27 #include "xfs_trans.h"
28 #include "xfs_inode_item.h"
29 #include "xfs_bmap.h"
30 #include "xfs_dir2.h"
31 #include "xfs_dir2_priv.h"
32 #include "xfs_error.h"
33 #include "xfs_trace.h"
34
35 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
36
37 /*
38 * @mode, if set, indicates that the type field needs to be set up.
39 * This uses the transformation from file mode to DT_* as defined in linux/fs.h
40 * for file type specification. This will be propagated into the directory
41 * structure if appropriate for the given operation and filesystem config.
42 */
43 const unsigned char xfs_mode_to_ftype[S_IFMT >> S_SHIFT] = {
44 [0] = XFS_DIR3_FT_UNKNOWN,
45 [S_IFREG >> S_SHIFT] = XFS_DIR3_FT_REG_FILE,
46 [S_IFDIR >> S_SHIFT] = XFS_DIR3_FT_DIR,
47 [S_IFCHR >> S_SHIFT] = XFS_DIR3_FT_CHRDEV,
48 [S_IFBLK >> S_SHIFT] = XFS_DIR3_FT_BLKDEV,
49 [S_IFIFO >> S_SHIFT] = XFS_DIR3_FT_FIFO,
50 [S_IFSOCK >> S_SHIFT] = XFS_DIR3_FT_SOCK,
51 [S_IFLNK >> S_SHIFT] = XFS_DIR3_FT_SYMLINK,
52 };
53
54 /*
55 * ASCII case-insensitive (ie. A-Z) support for directories that was
56 * used in IRIX.
57 */
58 STATIC xfs_dahash_t
59 xfs_ascii_ci_hashname(
60 struct xfs_name *name)
61 {
62 xfs_dahash_t hash;
63 int i;
64
65 for (i = 0, hash = 0; i < name->len; i++)
66 hash = tolower(name->name[i]) ^ rol32(hash, 7);
67
68 return hash;
69 }
70
71 STATIC enum xfs_dacmp
72 xfs_ascii_ci_compname(
73 struct xfs_da_args *args,
74 const unsigned char *name,
75 int len)
76 {
77 enum xfs_dacmp result;
78 int i;
79
80 if (args->namelen != len)
81 return XFS_CMP_DIFFERENT;
82
83 result = XFS_CMP_EXACT;
84 for (i = 0; i < len; i++) {
85 if (args->name[i] == name[i])
86 continue;
87 if (tolower(args->name[i]) != tolower(name[i]))
88 return XFS_CMP_DIFFERENT;
89 result = XFS_CMP_CASE;
90 }
91
92 return result;
93 }
94
95 static struct xfs_nameops xfs_ascii_ci_nameops = {
96 .hashname = xfs_ascii_ci_hashname,
97 .compname = xfs_ascii_ci_compname,
98 };
99
100 int
101 xfs_da_mount(
102 struct xfs_mount *mp)
103 {
104 struct xfs_da_geometry *dageo;
105 int nodehdr_size;
106
107
108 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
109 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
110 XFS_MAX_BLOCKSIZE);
111
112 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
113 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
114
115 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
116 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
117 KM_SLEEP | KM_MAYFAIL);
118 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
119 KM_SLEEP | KM_MAYFAIL);
120 if (!mp->m_dir_geo || !mp->m_attr_geo) {
121 kmem_free(mp->m_dir_geo);
122 kmem_free(mp->m_attr_geo);
123 return -ENOMEM;
124 }
125
126 /* set up directory geometry */
127 dageo = mp->m_dir_geo;
128 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
129 dageo->fsblog = mp->m_sb.sb_blocklog;
130 dageo->blksize = 1 << dageo->blklog;
131 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
132
133 /*
134 * Now we've set up the block conversion variables, we can calculate the
135 * segment block constants using the geometry structure.
136 */
137 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
138 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
139 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
140 dageo->node_ents = (dageo->blksize - nodehdr_size) /
141 (uint)sizeof(xfs_da_node_entry_t);
142 dageo->magicpct = (dageo->blksize * 37) / 100;
143
144 /* set up attribute geometry - single fsb only */
145 dageo = mp->m_attr_geo;
146 dageo->blklog = mp->m_sb.sb_blocklog;
147 dageo->fsblog = mp->m_sb.sb_blocklog;
148 dageo->blksize = 1 << dageo->blklog;
149 dageo->fsbcount = 1;
150 dageo->node_ents = (dageo->blksize - nodehdr_size) /
151 (uint)sizeof(xfs_da_node_entry_t);
152 dageo->magicpct = (dageo->blksize * 37) / 100;
153
154 if (xfs_sb_version_hasasciici(&mp->m_sb))
155 mp->m_dirnameops = &xfs_ascii_ci_nameops;
156 else
157 mp->m_dirnameops = &xfs_default_nameops;
158
159 return 0;
160 }
161
162 void
163 xfs_da_unmount(
164 struct xfs_mount *mp)
165 {
166 kmem_free(mp->m_dir_geo);
167 kmem_free(mp->m_attr_geo);
168 }
169
170 /*
171 * Return 1 if directory contains only "." and "..".
172 */
173 int
174 xfs_dir_isempty(
175 xfs_inode_t *dp)
176 {
177 xfs_dir2_sf_hdr_t *sfp;
178
179 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
180 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
181 return 1;
182 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
183 return 0;
184 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
185 return !sfp->count;
186 }
187
188 /*
189 * Validate a given inode number.
190 */
191 int
192 xfs_dir_ino_validate(
193 xfs_mount_t *mp,
194 xfs_ino_t ino)
195 {
196 xfs_agblock_t agblkno;
197 xfs_agino_t agino;
198 xfs_agnumber_t agno;
199 int ino_ok;
200 int ioff;
201
202 agno = XFS_INO_TO_AGNO(mp, ino);
203 agblkno = XFS_INO_TO_AGBNO(mp, ino);
204 ioff = XFS_INO_TO_OFFSET(mp, ino);
205 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
206 ino_ok =
207 agno < mp->m_sb.sb_agcount &&
208 agblkno < mp->m_sb.sb_agblocks &&
209 agblkno != 0 &&
210 ioff < (1 << mp->m_sb.sb_inopblog) &&
211 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
212 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
213 XFS_RANDOM_DIR_INO_VALIDATE))) {
214 xfs_warn(mp, "Invalid inode number 0x%Lx",
215 (unsigned long long) ino);
216 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
217 return -EFSCORRUPTED;
218 }
219 return 0;
220 }
221
222 /*
223 * Initialize a directory with its "." and ".." entries.
224 */
225 int
226 xfs_dir_init(
227 xfs_trans_t *tp,
228 xfs_inode_t *dp,
229 xfs_inode_t *pdp)
230 {
231 struct xfs_da_args *args;
232 int error;
233
234 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
235 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
236 if (error)
237 return error;
238
239 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
240 if (!args)
241 return -ENOMEM;
242
243 args->geo = dp->i_mount->m_dir_geo;
244 args->dp = dp;
245 args->trans = tp;
246 error = xfs_dir2_sf_create(args, pdp->i_ino);
247 kmem_free(args);
248 return error;
249 }
250
251 /*
252 * Enter a name in a directory, or check for available space.
253 * If inum is 0, only the available space test is performed.
254 */
255 int
256 xfs_dir_createname(
257 xfs_trans_t *tp,
258 xfs_inode_t *dp,
259 struct xfs_name *name,
260 xfs_ino_t inum, /* new entry inode number */
261 xfs_fsblock_t *first, /* bmap's firstblock */
262 xfs_bmap_free_t *flist, /* bmap's freeblock list */
263 xfs_extlen_t total) /* bmap's total block count */
264 {
265 struct xfs_da_args *args;
266 int rval;
267 int v; /* type-checking value */
268
269 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
270 if (inum) {
271 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
272 if (rval)
273 return rval;
274 XFS_STATS_INC(dp->i_mount, xs_dir_create);
275 }
276
277 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
278 if (!args)
279 return -ENOMEM;
280
281 args->geo = dp->i_mount->m_dir_geo;
282 args->name = name->name;
283 args->namelen = name->len;
284 args->filetype = name->type;
285 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
286 args->inumber = inum;
287 args->dp = dp;
288 args->firstblock = first;
289 args->flist = flist;
290 args->total = total;
291 args->whichfork = XFS_DATA_FORK;
292 args->trans = tp;
293 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
294 if (!inum)
295 args->op_flags |= XFS_DA_OP_JUSTCHECK;
296
297 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
298 rval = xfs_dir2_sf_addname(args);
299 goto out_free;
300 }
301
302 rval = xfs_dir2_isblock(args, &v);
303 if (rval)
304 goto out_free;
305 if (v) {
306 rval = xfs_dir2_block_addname(args);
307 goto out_free;
308 }
309
310 rval = xfs_dir2_isleaf(args, &v);
311 if (rval)
312 goto out_free;
313 if (v)
314 rval = xfs_dir2_leaf_addname(args);
315 else
316 rval = xfs_dir2_node_addname(args);
317
318 out_free:
319 kmem_free(args);
320 return rval;
321 }
322
323 /*
324 * If doing a CI lookup and case-insensitive match, dup actual name into
325 * args.value. Return EEXIST for success (ie. name found) or an error.
326 */
327 int
328 xfs_dir_cilookup_result(
329 struct xfs_da_args *args,
330 const unsigned char *name,
331 int len)
332 {
333 if (args->cmpresult == XFS_CMP_DIFFERENT)
334 return -ENOENT;
335 if (args->cmpresult != XFS_CMP_CASE ||
336 !(args->op_flags & XFS_DA_OP_CILOOKUP))
337 return -EEXIST;
338
339 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
340 if (!args->value)
341 return -ENOMEM;
342
343 memcpy(args->value, name, len);
344 args->valuelen = len;
345 return -EEXIST;
346 }
347
348 /*
349 * Lookup a name in a directory, give back the inode number.
350 * If ci_name is not NULL, returns the actual name in ci_name if it differs
351 * to name, or ci_name->name is set to NULL for an exact match.
352 */
353
354 int
355 xfs_dir_lookup(
356 xfs_trans_t *tp,
357 xfs_inode_t *dp,
358 struct xfs_name *name,
359 xfs_ino_t *inum, /* out: inode number */
360 struct xfs_name *ci_name) /* out: actual name if CI match */
361 {
362 struct xfs_da_args *args;
363 int rval;
364 int v; /* type-checking value */
365 int lock_mode;
366
367 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
368 XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
369
370 /*
371 * We need to use KM_NOFS here so that lockdep will not throw false
372 * positive deadlock warnings on a non-transactional lookup path. It is
373 * safe to recurse into inode recalim in that case, but lockdep can't
374 * easily be taught about it. Hence KM_NOFS avoids having to add more
375 * lockdep Doing this avoids having to add a bunch of lockdep class
376 * annotations into the reclaim path for the ilock.
377 */
378 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
379 args->geo = dp->i_mount->m_dir_geo;
380 args->name = name->name;
381 args->namelen = name->len;
382 args->filetype = name->type;
383 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
384 args->dp = dp;
385 args->whichfork = XFS_DATA_FORK;
386 args->trans = tp;
387 args->op_flags = XFS_DA_OP_OKNOENT;
388 if (ci_name)
389 args->op_flags |= XFS_DA_OP_CILOOKUP;
390
391 lock_mode = xfs_ilock_data_map_shared(dp);
392 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
393 rval = xfs_dir2_sf_lookup(args);
394 goto out_check_rval;
395 }
396
397 rval = xfs_dir2_isblock(args, &v);
398 if (rval)
399 goto out_free;
400 if (v) {
401 rval = xfs_dir2_block_lookup(args);
402 goto out_check_rval;
403 }
404
405 rval = xfs_dir2_isleaf(args, &v);
406 if (rval)
407 goto out_free;
408 if (v)
409 rval = xfs_dir2_leaf_lookup(args);
410 else
411 rval = xfs_dir2_node_lookup(args);
412
413 out_check_rval:
414 if (rval == -EEXIST)
415 rval = 0;
416 if (!rval) {
417 *inum = args->inumber;
418 if (ci_name) {
419 ci_name->name = args->value;
420 ci_name->len = args->valuelen;
421 }
422 }
423 out_free:
424 xfs_iunlock(dp, lock_mode);
425 kmem_free(args);
426 return rval;
427 }
428
429 /*
430 * Remove an entry from a directory.
431 */
432 int
433 xfs_dir_removename(
434 xfs_trans_t *tp,
435 xfs_inode_t *dp,
436 struct xfs_name *name,
437 xfs_ino_t ino,
438 xfs_fsblock_t *first, /* bmap's firstblock */
439 xfs_bmap_free_t *flist, /* bmap's freeblock list */
440 xfs_extlen_t total) /* bmap's total block count */
441 {
442 struct xfs_da_args *args;
443 int rval;
444 int v; /* type-checking value */
445
446 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
447 XFS_STATS_INC(dp->i_mount, xs_dir_remove);
448
449 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
450 if (!args)
451 return -ENOMEM;
452
453 args->geo = dp->i_mount->m_dir_geo;
454 args->name = name->name;
455 args->namelen = name->len;
456 args->filetype = name->type;
457 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
458 args->inumber = ino;
459 args->dp = dp;
460 args->firstblock = first;
461 args->flist = flist;
462 args->total = total;
463 args->whichfork = XFS_DATA_FORK;
464 args->trans = tp;
465
466 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
467 rval = xfs_dir2_sf_removename(args);
468 goto out_free;
469 }
470
471 rval = xfs_dir2_isblock(args, &v);
472 if (rval)
473 goto out_free;
474 if (v) {
475 rval = xfs_dir2_block_removename(args);
476 goto out_free;
477 }
478
479 rval = xfs_dir2_isleaf(args, &v);
480 if (rval)
481 goto out_free;
482 if (v)
483 rval = xfs_dir2_leaf_removename(args);
484 else
485 rval = xfs_dir2_node_removename(args);
486 out_free:
487 kmem_free(args);
488 return rval;
489 }
490
491 /*
492 * Replace the inode number of a directory entry.
493 */
494 int
495 xfs_dir_replace(
496 xfs_trans_t *tp,
497 xfs_inode_t *dp,
498 struct xfs_name *name, /* name of entry to replace */
499 xfs_ino_t inum, /* new inode number */
500 xfs_fsblock_t *first, /* bmap's firstblock */
501 xfs_bmap_free_t *flist, /* bmap's freeblock list */
502 xfs_extlen_t total) /* bmap's total block count */
503 {
504 struct xfs_da_args *args;
505 int rval;
506 int v; /* type-checking value */
507
508 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
509
510 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
511 if (rval)
512 return rval;
513
514 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
515 if (!args)
516 return -ENOMEM;
517
518 args->geo = dp->i_mount->m_dir_geo;
519 args->name = name->name;
520 args->namelen = name->len;
521 args->filetype = name->type;
522 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
523 args->inumber = inum;
524 args->dp = dp;
525 args->firstblock = first;
526 args->flist = flist;
527 args->total = total;
528 args->whichfork = XFS_DATA_FORK;
529 args->trans = tp;
530
531 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
532 rval = xfs_dir2_sf_replace(args);
533 goto out_free;
534 }
535
536 rval = xfs_dir2_isblock(args, &v);
537 if (rval)
538 goto out_free;
539 if (v) {
540 rval = xfs_dir2_block_replace(args);
541 goto out_free;
542 }
543
544 rval = xfs_dir2_isleaf(args, &v);
545 if (rval)
546 goto out_free;
547 if (v)
548 rval = xfs_dir2_leaf_replace(args);
549 else
550 rval = xfs_dir2_node_replace(args);
551 out_free:
552 kmem_free(args);
553 return rval;
554 }
555
556 /*
557 * See if this entry can be added to the directory without allocating space.
558 */
559 int
560 xfs_dir_canenter(
561 xfs_trans_t *tp,
562 xfs_inode_t *dp,
563 struct xfs_name *name) /* name of entry to add */
564 {
565 return xfs_dir_createname(tp, dp, name, 0, NULL, NULL, 0);
566 }
567
568 /*
569 * Utility routines.
570 */
571
572 /*
573 * Add a block to the directory.
574 *
575 * This routine is for data and free blocks, not leaf/node blocks which are
576 * handled by xfs_da_grow_inode.
577 */
578 int
579 xfs_dir2_grow_inode(
580 struct xfs_da_args *args,
581 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
582 xfs_dir2_db_t *dbp) /* out: block number added */
583 {
584 struct xfs_inode *dp = args->dp;
585 struct xfs_mount *mp = dp->i_mount;
586 xfs_fileoff_t bno; /* directory offset of new block */
587 int count; /* count of filesystem blocks */
588 int error;
589
590 trace_xfs_dir2_grow_inode(args, space);
591
592 /*
593 * Set lowest possible block in the space requested.
594 */
595 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
596 count = args->geo->fsbcount;
597
598 error = xfs_da_grow_inode_int(args, &bno, count);
599 if (error)
600 return error;
601
602 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
603
604 /*
605 * Update file's size if this is the data space and it grew.
606 */
607 if (space == XFS_DIR2_DATA_SPACE) {
608 xfs_fsize_t size; /* directory file (data) size */
609
610 size = XFS_FSB_TO_B(mp, bno + count);
611 if (size > dp->i_d.di_size) {
612 dp->i_d.di_size = size;
613 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
614 }
615 }
616 return 0;
617 }
618
619 /*
620 * See if the directory is a single-block form directory.
621 */
622 int
623 xfs_dir2_isblock(
624 struct xfs_da_args *args,
625 int *vp) /* out: 1 is block, 0 is not block */
626 {
627 xfs_fileoff_t last; /* last file offset */
628 int rval;
629
630 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
631 return rval;
632 rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize;
633 ASSERT(rval == 0 || args->dp->i_d.di_size == args->geo->blksize);
634 *vp = rval;
635 return 0;
636 }
637
638 /*
639 * See if the directory is a single-leaf form directory.
640 */
641 int
642 xfs_dir2_isleaf(
643 struct xfs_da_args *args,
644 int *vp) /* out: 1 is block, 0 is not block */
645 {
646 xfs_fileoff_t last; /* last file offset */
647 int rval;
648
649 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
650 return rval;
651 *vp = last == args->geo->leafblk + args->geo->fsbcount;
652 return 0;
653 }
654
655 /*
656 * Remove the given block from the directory.
657 * This routine is used for data and free blocks, leaf/node are done
658 * by xfs_da_shrink_inode.
659 */
660 int
661 xfs_dir2_shrink_inode(
662 xfs_da_args_t *args,
663 xfs_dir2_db_t db,
664 struct xfs_buf *bp)
665 {
666 xfs_fileoff_t bno; /* directory file offset */
667 xfs_dablk_t da; /* directory file offset */
668 int done; /* bunmap is finished */
669 xfs_inode_t *dp;
670 int error;
671 xfs_mount_t *mp;
672 xfs_trans_t *tp;
673
674 trace_xfs_dir2_shrink_inode(args, db);
675
676 dp = args->dp;
677 mp = dp->i_mount;
678 tp = args->trans;
679 da = xfs_dir2_db_to_da(args->geo, db);
680
681 /* Unmap the fsblock(s). */
682 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0,
683 args->firstblock, args->flist, &done);
684 if (error) {
685 /*
686 * ENOSPC actually can happen if we're in a removename with no
687 * space reservation, and the resulting block removal would
688 * cause a bmap btree split or conversion from extents to btree.
689 * This can only happen for un-fragmented directory blocks,
690 * since you need to be punching out the middle of an extent.
691 * In this case we need to leave the block in the file, and not
692 * binval it. So the block has to be in a consistent empty
693 * state and appropriately logged. We don't free up the buffer,
694 * the caller can tell it hasn't happened since it got an error
695 * back.
696 */
697 return error;
698 }
699 ASSERT(done);
700 /*
701 * Invalidate the buffer from the transaction.
702 */
703 xfs_trans_binval(tp, bp);
704 /*
705 * If it's not a data block, we're done.
706 */
707 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
708 return 0;
709 /*
710 * If the block isn't the last one in the directory, we're done.
711 */
712 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
713 return 0;
714 bno = da;
715 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
716 /*
717 * This can't really happen unless there's kernel corruption.
718 */
719 return error;
720 }
721 if (db == args->geo->datablk)
722 ASSERT(bno == 0);
723 else
724 ASSERT(bno > 0);
725 /*
726 * Set the size to the new last block.
727 */
728 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
729 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
730 return 0;
731 }
Linux kernel - Deliverables
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