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xfs: convert m_dirblkfsbs to xfs_da_geometry
[deliverable/linux.git] / fs / xfs / 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_inum.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.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"
32 #include "xfs_bmap.h"
33 #include "xfs_dir2.h"
34 #include "xfs_dir2_priv.h"
35 #include "xfs_error.h"
36 #include "xfs_trace.h"
37 #include "xfs_dinode.h"
38
39 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
40
41
42 /*
43 * ASCII case-insensitive (ie. A-Z) support for directories that was
44 * used in IRIX.
45 */
46 STATIC xfs_dahash_t
47 xfs_ascii_ci_hashname(
48 struct xfs_name *name)
49 {
50 xfs_dahash_t hash;
51 int i;
52
53 for (i = 0, hash = 0; i < name->len; i++)
54 hash = tolower(name->name[i]) ^ rol32(hash, 7);
55
56 return hash;
57 }
58
59 STATIC enum xfs_dacmp
60 xfs_ascii_ci_compname(
61 struct xfs_da_args *args,
62 const unsigned char *name,
63 int len)
64 {
65 enum xfs_dacmp result;
66 int i;
67
68 if (args->namelen != len)
69 return XFS_CMP_DIFFERENT;
70
71 result = XFS_CMP_EXACT;
72 for (i = 0; i < len; i++) {
73 if (args->name[i] == name[i])
74 continue;
75 if (tolower(args->name[i]) != tolower(name[i]))
76 return XFS_CMP_DIFFERENT;
77 result = XFS_CMP_CASE;
78 }
79
80 return result;
81 }
82
83 static struct xfs_nameops xfs_ascii_ci_nameops = {
84 .hashname = xfs_ascii_ci_hashname,
85 .compname = xfs_ascii_ci_compname,
86 };
87
88 int
89 xfs_da_mount(
90 struct xfs_mount *mp)
91 {
92 struct xfs_da_geometry *dageo;
93 int nodehdr_size;
94
95
96 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
97 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
98 XFS_MAX_BLOCKSIZE);
99
100 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
101 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
102
103 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
104 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
105 KM_SLEEP | KM_MAYFAIL);
106 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
107 KM_SLEEP | KM_MAYFAIL);
108 if (!mp->m_dir_geo || !mp->m_attr_geo) {
109 kmem_free(mp->m_dir_geo);
110 kmem_free(mp->m_attr_geo);
111 return ENOMEM;
112 }
113
114 /* set up directory geometry */
115 dageo = mp->m_dir_geo;
116 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
117 dageo->fsblog = mp->m_sb.sb_blocklog;
118 dageo->blksize = 1 << dageo->blklog;
119 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
120
121 /*
122 * Now we've set up the block conversion variables, we can calculate the
123 * segment block constants using the geometry structure.
124 */
125 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
126 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
127 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
128 dageo->node_ents = (dageo->blksize - nodehdr_size) /
129 (uint)sizeof(xfs_da_node_entry_t);
130 dageo->magicpct = (dageo->blksize * 37) / 100;
131
132 /* set up attribute geometry - single fsb only */
133 dageo = mp->m_attr_geo;
134 dageo->blklog = mp->m_sb.sb_blocklog;
135 dageo->fsblog = mp->m_sb.sb_blocklog;
136 dageo->blksize = 1 << dageo->blklog;
137 dageo->fsbcount = 1;
138 dageo->node_ents = (dageo->blksize - nodehdr_size) /
139 (uint)sizeof(xfs_da_node_entry_t);
140 dageo->magicpct = (dageo->blksize * 37) / 100;
141
142 if (xfs_sb_version_hasasciici(&mp->m_sb))
143 mp->m_dirnameops = &xfs_ascii_ci_nameops;
144 else
145 mp->m_dirnameops = &xfs_default_nameops;
146
147 /* XXX: these are to be removed as code is converted to use geo */
148 mp->m_dirblksize = mp->m_dir_geo->blksize;
149 mp->m_dir_node_ents = mp->m_dir_geo->node_ents;
150 mp->m_dir_magicpct = mp->m_dir_geo->magicpct;
151 mp->m_attr_node_ents = mp->m_attr_geo->node_ents;
152 mp->m_attr_magicpct = mp->m_attr_geo->magicpct;
153 return 0;
154 }
155
156 void
157 xfs_da_unmount(
158 struct xfs_mount *mp)
159 {
160 kmem_free(mp->m_dir_geo);
161 kmem_free(mp->m_attr_geo);
162 }
163
164 /*
165 * Return 1 if directory contains only "." and "..".
166 */
167 int
168 xfs_dir_isempty(
169 xfs_inode_t *dp)
170 {
171 xfs_dir2_sf_hdr_t *sfp;
172
173 ASSERT(S_ISDIR(dp->i_d.di_mode));
174 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
175 return 1;
176 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
177 return 0;
178 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
179 return !sfp->count;
180 }
181
182 /*
183 * Validate a given inode number.
184 */
185 int
186 xfs_dir_ino_validate(
187 xfs_mount_t *mp,
188 xfs_ino_t ino)
189 {
190 xfs_agblock_t agblkno;
191 xfs_agino_t agino;
192 xfs_agnumber_t agno;
193 int ino_ok;
194 int ioff;
195
196 agno = XFS_INO_TO_AGNO(mp, ino);
197 agblkno = XFS_INO_TO_AGBNO(mp, ino);
198 ioff = XFS_INO_TO_OFFSET(mp, ino);
199 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
200 ino_ok =
201 agno < mp->m_sb.sb_agcount &&
202 agblkno < mp->m_sb.sb_agblocks &&
203 agblkno != 0 &&
204 ioff < (1 << mp->m_sb.sb_inopblog) &&
205 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
206 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
207 XFS_RANDOM_DIR_INO_VALIDATE))) {
208 xfs_warn(mp, "Invalid inode number 0x%Lx",
209 (unsigned long long) ino);
210 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
211 return XFS_ERROR(EFSCORRUPTED);
212 }
213 return 0;
214 }
215
216 /*
217 * Initialize a directory with its "." and ".." entries.
218 */
219 int
220 xfs_dir_init(
221 xfs_trans_t *tp,
222 xfs_inode_t *dp,
223 xfs_inode_t *pdp)
224 {
225 struct xfs_da_args *args;
226 int error;
227
228 ASSERT(S_ISDIR(dp->i_d.di_mode));
229 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
230 if (error)
231 return error;
232
233 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
234 if (!args)
235 return ENOMEM;
236
237 args->geo = dp->i_mount->m_dir_geo;
238 args->dp = dp;
239 args->trans = tp;
240 error = xfs_dir2_sf_create(args, pdp->i_ino);
241 kmem_free(args);
242 return error;
243 }
244
245 /*
246 Enter a name in a directory.
247 */
248 int
249 xfs_dir_createname(
250 xfs_trans_t *tp,
251 xfs_inode_t *dp,
252 struct xfs_name *name,
253 xfs_ino_t inum, /* new entry inode number */
254 xfs_fsblock_t *first, /* bmap's firstblock */
255 xfs_bmap_free_t *flist, /* bmap's freeblock list */
256 xfs_extlen_t total) /* bmap's total block count */
257 {
258 struct xfs_da_args *args;
259 int rval;
260 int v; /* type-checking value */
261
262 ASSERT(S_ISDIR(dp->i_d.di_mode));
263 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
264 if (rval)
265 return rval;
266 XFS_STATS_INC(xs_dir_create);
267
268 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
269 if (!args)
270 return ENOMEM;
271
272 args->geo = dp->i_mount->m_dir_geo;
273 args->name = name->name;
274 args->namelen = name->len;
275 args->filetype = name->type;
276 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
277 args->inumber = inum;
278 args->dp = dp;
279 args->firstblock = first;
280 args->flist = flist;
281 args->total = total;
282 args->whichfork = XFS_DATA_FORK;
283 args->trans = tp;
284 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
285
286 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
287 rval = xfs_dir2_sf_addname(args);
288 goto out_free;
289 }
290
291 rval = xfs_dir2_isblock(dp, &v);
292 if (rval)
293 goto out_free;
294 if (v) {
295 rval = xfs_dir2_block_addname(args);
296 goto out_free;
297 }
298
299 rval = xfs_dir2_isleaf(dp, &v);
300 if (rval)
301 goto out_free;
302 if (v)
303 rval = xfs_dir2_leaf_addname(args);
304 else
305 rval = xfs_dir2_node_addname(args);
306
307 out_free:
308 kmem_free(args);
309 return rval;
310 }
311
312 /*
313 * If doing a CI lookup and case-insensitive match, dup actual name into
314 * args.value. Return EEXIST for success (ie. name found) or an error.
315 */
316 int
317 xfs_dir_cilookup_result(
318 struct xfs_da_args *args,
319 const unsigned char *name,
320 int len)
321 {
322 if (args->cmpresult == XFS_CMP_DIFFERENT)
323 return ENOENT;
324 if (args->cmpresult != XFS_CMP_CASE ||
325 !(args->op_flags & XFS_DA_OP_CILOOKUP))
326 return EEXIST;
327
328 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
329 if (!args->value)
330 return ENOMEM;
331
332 memcpy(args->value, name, len);
333 args->valuelen = len;
334 return EEXIST;
335 }
336
337 /*
338 * Lookup a name in a directory, give back the inode number.
339 * If ci_name is not NULL, returns the actual name in ci_name if it differs
340 * to name, or ci_name->name is set to NULL for an exact match.
341 */
342
343 int
344 xfs_dir_lookup(
345 xfs_trans_t *tp,
346 xfs_inode_t *dp,
347 struct xfs_name *name,
348 xfs_ino_t *inum, /* out: inode number */
349 struct xfs_name *ci_name) /* out: actual name if CI match */
350 {
351 struct xfs_da_args *args;
352 int rval;
353 int v; /* type-checking value */
354
355 ASSERT(S_ISDIR(dp->i_d.di_mode));
356 XFS_STATS_INC(xs_dir_lookup);
357
358 /*
359 * We need to use KM_NOFS here so that lockdep will not throw false
360 * positive deadlock warnings on a non-transactional lookup path. It is
361 * safe to recurse into inode recalim in that case, but lockdep can't
362 * easily be taught about it. Hence KM_NOFS avoids having to add more
363 * lockdep Doing this avoids having to add a bunch of lockdep class
364 * annotations into the reclaim path for the ilock.
365 */
366 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
367 args->geo = dp->i_mount->m_dir_geo;
368 args->name = name->name;
369 args->namelen = name->len;
370 args->filetype = name->type;
371 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
372 args->dp = dp;
373 args->whichfork = XFS_DATA_FORK;
374 args->trans = tp;
375 args->op_flags = XFS_DA_OP_OKNOENT;
376 if (ci_name)
377 args->op_flags |= XFS_DA_OP_CILOOKUP;
378
379 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
380 rval = xfs_dir2_sf_lookup(args);
381 goto out_check_rval;
382 }
383
384 rval = xfs_dir2_isblock(dp, &v);
385 if (rval)
386 goto out_free;
387 if (v) {
388 rval = xfs_dir2_block_lookup(args);
389 goto out_check_rval;
390 }
391
392 rval = xfs_dir2_isleaf(dp, &v);
393 if (rval)
394 goto out_free;
395 if (v)
396 rval = xfs_dir2_leaf_lookup(args);
397 else
398 rval = xfs_dir2_node_lookup(args);
399
400 out_check_rval:
401 if (rval == EEXIST)
402 rval = 0;
403 if (!rval) {
404 *inum = args->inumber;
405 if (ci_name) {
406 ci_name->name = args->value;
407 ci_name->len = args->valuelen;
408 }
409 }
410 out_free:
411 kmem_free(args);
412 return rval;
413 }
414
415 /*
416 * Remove an entry from a directory.
417 */
418 int
419 xfs_dir_removename(
420 xfs_trans_t *tp,
421 xfs_inode_t *dp,
422 struct xfs_name *name,
423 xfs_ino_t ino,
424 xfs_fsblock_t *first, /* bmap's firstblock */
425 xfs_bmap_free_t *flist, /* bmap's freeblock list */
426 xfs_extlen_t total) /* bmap's total block count */
427 {
428 struct xfs_da_args *args;
429 int rval;
430 int v; /* type-checking value */
431
432 ASSERT(S_ISDIR(dp->i_d.di_mode));
433 XFS_STATS_INC(xs_dir_remove);
434
435 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
436 if (!args)
437 return ENOMEM;
438
439 args->geo = dp->i_mount->m_dir_geo;
440 args->name = name->name;
441 args->namelen = name->len;
442 args->filetype = name->type;
443 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
444 args->inumber = ino;
445 args->dp = dp;
446 args->firstblock = first;
447 args->flist = flist;
448 args->total = total;
449 args->whichfork = XFS_DATA_FORK;
450 args->trans = tp;
451
452 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
453 rval = xfs_dir2_sf_removename(args);
454 goto out_free;
455 }
456
457 rval = xfs_dir2_isblock(dp, &v);
458 if (rval)
459 goto out_free;
460 if (v) {
461 rval = xfs_dir2_block_removename(args);
462 goto out_free;
463 }
464
465 rval = xfs_dir2_isleaf(dp, &v);
466 if (rval)
467 goto out_free;
468 if (v)
469 rval = xfs_dir2_leaf_removename(args);
470 else
471 rval = xfs_dir2_node_removename(args);
472 out_free:
473 kmem_free(args);
474 return rval;
475 }
476
477 /*
478 * Replace the inode number of a directory entry.
479 */
480 int
481 xfs_dir_replace(
482 xfs_trans_t *tp,
483 xfs_inode_t *dp,
484 struct xfs_name *name, /* name of entry to replace */
485 xfs_ino_t inum, /* new inode number */
486 xfs_fsblock_t *first, /* bmap's firstblock */
487 xfs_bmap_free_t *flist, /* bmap's freeblock list */
488 xfs_extlen_t total) /* bmap's total block count */
489 {
490 struct xfs_da_args *args;
491 int rval;
492 int v; /* type-checking value */
493
494 ASSERT(S_ISDIR(dp->i_d.di_mode));
495
496 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
497 if (rval)
498 return rval;
499
500 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
501 if (!args)
502 return ENOMEM;
503
504 args->geo = dp->i_mount->m_dir_geo;
505 args->name = name->name;
506 args->namelen = name->len;
507 args->filetype = name->type;
508 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
509 args->inumber = inum;
510 args->dp = dp;
511 args->firstblock = first;
512 args->flist = flist;
513 args->total = total;
514 args->whichfork = XFS_DATA_FORK;
515 args->trans = tp;
516
517 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
518 rval = xfs_dir2_sf_replace(args);
519 goto out_free;
520 }
521
522 rval = xfs_dir2_isblock(dp, &v);
523 if (rval)
524 goto out_free;
525 if (v) {
526 rval = xfs_dir2_block_replace(args);
527 goto out_free;
528 }
529
530 rval = xfs_dir2_isleaf(dp, &v);
531 if (rval)
532 goto out_free;
533 if (v)
534 rval = xfs_dir2_leaf_replace(args);
535 else
536 rval = xfs_dir2_node_replace(args);
537 out_free:
538 kmem_free(args);
539 return rval;
540 }
541
542 /*
543 * See if this entry can be added to the directory without allocating space.
544 * First checks that the caller couldn't reserve enough space (resblks = 0).
545 */
546 int
547 xfs_dir_canenter(
548 xfs_trans_t *tp,
549 xfs_inode_t *dp,
550 struct xfs_name *name, /* name of entry to add */
551 uint resblks)
552 {
553 struct xfs_da_args *args;
554 int rval;
555 int v; /* type-checking value */
556
557 if (resblks)
558 return 0;
559
560 ASSERT(S_ISDIR(dp->i_d.di_mode));
561
562 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
563 if (!args)
564 return ENOMEM;
565
566 args->geo = dp->i_mount->m_dir_geo;
567 args->name = name->name;
568 args->namelen = name->len;
569 args->filetype = name->type;
570 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
571 args->dp = dp;
572 args->whichfork = XFS_DATA_FORK;
573 args->trans = tp;
574 args->op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
575 XFS_DA_OP_OKNOENT;
576
577 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
578 rval = xfs_dir2_sf_addname(args);
579 goto out_free;
580 }
581
582 rval = xfs_dir2_isblock(dp, &v);
583 if (rval)
584 goto out_free;
585 if (v) {
586 rval = xfs_dir2_block_addname(args);
587 goto out_free;
588 }
589
590 rval = xfs_dir2_isleaf(dp, &v);
591 if (rval)
592 goto out_free;
593 if (v)
594 rval = xfs_dir2_leaf_addname(args);
595 else
596 rval = xfs_dir2_node_addname(args);
597 out_free:
598 kmem_free(args);
599 return rval;
600 }
601
602 /*
603 * Utility routines.
604 */
605
606 /*
607 * Add a block to the directory.
608 *
609 * This routine is for data and free blocks, not leaf/node blocks which are
610 * handled by xfs_da_grow_inode.
611 */
612 int
613 xfs_dir2_grow_inode(
614 struct xfs_da_args *args,
615 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
616 xfs_dir2_db_t *dbp) /* out: block number added */
617 {
618 struct xfs_inode *dp = args->dp;
619 struct xfs_mount *mp = dp->i_mount;
620 xfs_fileoff_t bno; /* directory offset of new block */
621 int count; /* count of filesystem blocks */
622 int error;
623
624 trace_xfs_dir2_grow_inode(args, space);
625
626 /*
627 * Set lowest possible block in the space requested.
628 */
629 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
630 count = args->geo->fsbcount;
631
632 error = xfs_da_grow_inode_int(args, &bno, count);
633 if (error)
634 return error;
635
636 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
637
638 /*
639 * Update file's size if this is the data space and it grew.
640 */
641 if (space == XFS_DIR2_DATA_SPACE) {
642 xfs_fsize_t size; /* directory file (data) size */
643
644 size = XFS_FSB_TO_B(mp, bno + count);
645 if (size > dp->i_d.di_size) {
646 dp->i_d.di_size = size;
647 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
648 }
649 }
650 return 0;
651 }
652
653 /*
654 * See if the directory is a single-block form directory.
655 */
656 int
657 xfs_dir2_isblock(
658 xfs_inode_t *dp,
659 int *vp) /* out: 1 is block, 0 is not block */
660 {
661 xfs_fileoff_t last; /* last file offset */
662 xfs_mount_t *mp;
663 int rval;
664
665 mp = dp->i_mount;
666 if ((rval = xfs_bmap_last_offset(dp, &last, XFS_DATA_FORK)))
667 return rval;
668 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
669 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
670 *vp = rval;
671 return 0;
672 }
673
674 /*
675 * See if the directory is a single-leaf form directory.
676 */
677 int
678 xfs_dir2_isleaf(
679 xfs_inode_t *dp,
680 int *vp) /* out: 1 is leaf, 0 is not leaf */
681 {
682 xfs_fileoff_t last; /* last file offset */
683 xfs_mount_t *mp;
684 int rval;
685
686 mp = dp->i_mount;
687 if ((rval = xfs_bmap_last_offset(dp, &last, XFS_DATA_FORK)))
688 return rval;
689 *vp = last == mp->m_dir_geo->leafblk + (1 << mp->m_sb.sb_dirblklog);
690 return 0;
691 }
692
693 /*
694 * Remove the given block from the directory.
695 * This routine is used for data and free blocks, leaf/node are done
696 * by xfs_da_shrink_inode.
697 */
698 int
699 xfs_dir2_shrink_inode(
700 xfs_da_args_t *args,
701 xfs_dir2_db_t db,
702 struct xfs_buf *bp)
703 {
704 xfs_fileoff_t bno; /* directory file offset */
705 xfs_dablk_t da; /* directory file offset */
706 int done; /* bunmap is finished */
707 xfs_inode_t *dp;
708 int error;
709 xfs_mount_t *mp;
710 xfs_trans_t *tp;
711
712 trace_xfs_dir2_shrink_inode(args, db);
713
714 dp = args->dp;
715 mp = dp->i_mount;
716 tp = args->trans;
717 da = xfs_dir2_db_to_da(args->geo, db);
718 /*
719 * Unmap the fsblock(s).
720 */
721 if ((error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount,
722 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
723 &done))) {
724 /*
725 * ENOSPC actually can happen if we're in a removename with
726 * no space reservation, and the resulting block removal
727 * would cause a bmap btree split or conversion from extents
728 * to btree. This can only happen for un-fragmented
729 * directory blocks, since you need to be punching out
730 * the middle of an extent.
731 * In this case we need to leave the block in the file,
732 * and not binval it.
733 * So the block has to be in a consistent empty state
734 * and appropriately logged.
735 * We don't free up the buffer, the caller can tell it
736 * hasn't happened since it got an error back.
737 */
738 return error;
739 }
740 ASSERT(done);
741 /*
742 * Invalidate the buffer from the transaction.
743 */
744 xfs_trans_binval(tp, bp);
745 /*
746 * If it's not a data block, we're done.
747 */
748 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
749 return 0;
750 /*
751 * If the block isn't the last one in the directory, we're done.
752 */
753 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
754 return 0;
755 bno = da;
756 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
757 /*
758 * This can't really happen unless there's kernel corruption.
759 */
760 return error;
761 }
762 if (db == args->geo->datablk)
763 ASSERT(bno == 0);
764 else
765 ASSERT(bno > 0);
766 /*
767 * Set the size to the new last block.
768 */
769 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
770 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
771 return 0;
772 }
Linux kernel - Deliverables
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