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_defer.h"
25 #include "xfs_da_format.h"
26 #include "xfs_da_btree.h"
27 #include "xfs_inode.h"
28 #include "xfs_trans.h"
29 #include "xfs_inode_item.h"
30 #include "xfs_bmap.h"
31 #include "xfs_dir2.h"
32 #include "xfs_dir2_priv.h"
33 #include "xfs_error.h"
34 #include "xfs_trace.h"
35
36 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
37
38 /*
39 * Convert inode mode to directory entry filetype
40 */
xfs_mode_to_ftype(int mode)41 unsigned char xfs_mode_to_ftype(int mode)
42 {
43 switch (mode & S_IFMT) {
44 case S_IFREG:
45 return XFS_DIR3_FT_REG_FILE;
46 case S_IFDIR:
47 return XFS_DIR3_FT_DIR;
48 case S_IFCHR:
49 return XFS_DIR3_FT_CHRDEV;
50 case S_IFBLK:
51 return XFS_DIR3_FT_BLKDEV;
52 case S_IFIFO:
53 return XFS_DIR3_FT_FIFO;
54 case S_IFSOCK:
55 return XFS_DIR3_FT_SOCK;
56 case S_IFLNK:
57 return XFS_DIR3_FT_SYMLINK;
58 default:
59 return XFS_DIR3_FT_UNKNOWN;
60 }
61 }
62
63 /*
64 * ASCII case-insensitive (ie. A-Z) support for directories that was
65 * used in IRIX.
66 */
67 STATIC xfs_dahash_t
xfs_ascii_ci_hashname(struct xfs_name * name)68 xfs_ascii_ci_hashname(
69 struct xfs_name *name)
70 {
71 xfs_dahash_t hash;
72 int i;
73
74 for (i = 0, hash = 0; i < name->len; i++)
75 hash = tolower(name->name[i]) ^ rol32(hash, 7);
76
77 return hash;
78 }
79
80 STATIC enum xfs_dacmp
xfs_ascii_ci_compname(struct xfs_da_args * args,const unsigned char * name,int len)81 xfs_ascii_ci_compname(
82 struct xfs_da_args *args,
83 const unsigned char *name,
84 int len)
85 {
86 enum xfs_dacmp result;
87 int i;
88
89 if (args->namelen != len)
90 return XFS_CMP_DIFFERENT;
91
92 result = XFS_CMP_EXACT;
93 for (i = 0; i < len; i++) {
94 if (args->name[i] == name[i])
95 continue;
96 if (tolower(args->name[i]) != tolower(name[i]))
97 return XFS_CMP_DIFFERENT;
98 result = XFS_CMP_CASE;
99 }
100
101 return result;
102 }
103
104 static struct xfs_nameops xfs_ascii_ci_nameops = {
105 .hashname = xfs_ascii_ci_hashname,
106 .compname = xfs_ascii_ci_compname,
107 };
108
109 int
xfs_da_mount(struct xfs_mount * mp)110 xfs_da_mount(
111 struct xfs_mount *mp)
112 {
113 struct xfs_da_geometry *dageo;
114 int nodehdr_size;
115
116
117 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
118 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
119 XFS_MAX_BLOCKSIZE);
120
121 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
122 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
123
124 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
125 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
126 KM_SLEEP | KM_MAYFAIL);
127 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
128 KM_SLEEP | KM_MAYFAIL);
129 if (!mp->m_dir_geo || !mp->m_attr_geo) {
130 kmem_free(mp->m_dir_geo);
131 kmem_free(mp->m_attr_geo);
132 return -ENOMEM;
133 }
134
135 /* set up directory geometry */
136 dageo = mp->m_dir_geo;
137 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
138 dageo->fsblog = mp->m_sb.sb_blocklog;
139 dageo->blksize = 1 << dageo->blklog;
140 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
141
142 /*
143 * Now we've set up the block conversion variables, we can calculate the
144 * segment block constants using the geometry structure.
145 */
146 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
147 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
148 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
149 dageo->node_ents = (dageo->blksize - nodehdr_size) /
150 (uint)sizeof(xfs_da_node_entry_t);
151 dageo->magicpct = (dageo->blksize * 37) / 100;
152
153 /* set up attribute geometry - single fsb only */
154 dageo = mp->m_attr_geo;
155 dageo->blklog = mp->m_sb.sb_blocklog;
156 dageo->fsblog = mp->m_sb.sb_blocklog;
157 dageo->blksize = 1 << dageo->blklog;
158 dageo->fsbcount = 1;
159 dageo->node_ents = (dageo->blksize - nodehdr_size) /
160 (uint)sizeof(xfs_da_node_entry_t);
161 dageo->magicpct = (dageo->blksize * 37) / 100;
162
163 if (xfs_sb_version_hasasciici(&mp->m_sb))
164 mp->m_dirnameops = &xfs_ascii_ci_nameops;
165 else
166 mp->m_dirnameops = &xfs_default_nameops;
167
168 return 0;
169 }
170
171 void
xfs_da_unmount(struct xfs_mount * mp)172 xfs_da_unmount(
173 struct xfs_mount *mp)
174 {
175 kmem_free(mp->m_dir_geo);
176 kmem_free(mp->m_attr_geo);
177 }
178
179 /*
180 * Return 1 if directory contains only "." and "..".
181 */
182 int
xfs_dir_isempty(xfs_inode_t * dp)183 xfs_dir_isempty(
184 xfs_inode_t *dp)
185 {
186 xfs_dir2_sf_hdr_t *sfp;
187
188 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
189 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
190 return 1;
191 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
192 return 0;
193 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
194 return !sfp->count;
195 }
196
197 /*
198 * Validate a given inode number.
199 */
200 int
xfs_dir_ino_validate(xfs_mount_t * mp,xfs_ino_t ino)201 xfs_dir_ino_validate(
202 xfs_mount_t *mp,
203 xfs_ino_t ino)
204 {
205 xfs_agblock_t agblkno;
206 xfs_agino_t agino;
207 xfs_agnumber_t agno;
208 int ino_ok;
209 int ioff;
210
211 agno = XFS_INO_TO_AGNO(mp, ino);
212 agblkno = XFS_INO_TO_AGBNO(mp, ino);
213 ioff = XFS_INO_TO_OFFSET(mp, ino);
214 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
215 ino_ok =
216 agno < mp->m_sb.sb_agcount &&
217 agblkno < mp->m_sb.sb_agblocks &&
218 agblkno != 0 &&
219 ioff < (1 << mp->m_sb.sb_inopblog) &&
220 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
221 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
222 XFS_RANDOM_DIR_INO_VALIDATE))) {
223 xfs_warn(mp, "Invalid inode number 0x%Lx",
224 (unsigned long long) ino);
225 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
226 return -EFSCORRUPTED;
227 }
228 return 0;
229 }
230
231 /*
232 * Initialize a directory with its "." and ".." entries.
233 */
234 int
xfs_dir_init(xfs_trans_t * tp,xfs_inode_t * dp,xfs_inode_t * pdp)235 xfs_dir_init(
236 xfs_trans_t *tp,
237 xfs_inode_t *dp,
238 xfs_inode_t *pdp)
239 {
240 struct xfs_da_args *args;
241 int error;
242
243 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
244 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
245 if (error)
246 return error;
247
248 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
249 if (!args)
250 return -ENOMEM;
251
252 args->geo = dp->i_mount->m_dir_geo;
253 args->dp = dp;
254 args->trans = tp;
255 error = xfs_dir2_sf_create(args, pdp->i_ino);
256 kmem_free(args);
257 return error;
258 }
259
260 /*
261 * Enter a name in a directory, or check for available space.
262 * If inum is 0, only the available space test is performed.
263 */
264 int
xfs_dir_createname(xfs_trans_t * tp,xfs_inode_t * dp,struct xfs_name * name,xfs_ino_t inum,xfs_fsblock_t * first,struct xfs_defer_ops * dfops,xfs_extlen_t total)265 xfs_dir_createname(
266 xfs_trans_t *tp,
267 xfs_inode_t *dp,
268 struct xfs_name *name,
269 xfs_ino_t inum, /* new entry inode number */
270 xfs_fsblock_t *first, /* bmap's firstblock */
271 struct xfs_defer_ops *dfops, /* bmap's freeblock list */
272 xfs_extlen_t total) /* bmap's total block count */
273 {
274 struct xfs_da_args *args;
275 int rval;
276 int v; /* type-checking value */
277
278 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
279 if (inum) {
280 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
281 if (rval)
282 return rval;
283 XFS_STATS_INC(dp->i_mount, xs_dir_create);
284 }
285
286 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
287 if (!args)
288 return -ENOMEM;
289
290 args->geo = dp->i_mount->m_dir_geo;
291 args->name = name->name;
292 args->namelen = name->len;
293 args->filetype = name->type;
294 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
295 args->inumber = inum;
296 args->dp = dp;
297 args->firstblock = first;
298 args->dfops = dfops;
299 args->total = total;
300 args->whichfork = XFS_DATA_FORK;
301 args->trans = tp;
302 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
303 if (!inum)
304 args->op_flags |= XFS_DA_OP_JUSTCHECK;
305
306 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
307 rval = xfs_dir2_sf_addname(args);
308 goto out_free;
309 }
310
311 rval = xfs_dir2_isblock(args, &v);
312 if (rval)
313 goto out_free;
314 if (v) {
315 rval = xfs_dir2_block_addname(args);
316 goto out_free;
317 }
318
319 rval = xfs_dir2_isleaf(args, &v);
320 if (rval)
321 goto out_free;
322 if (v)
323 rval = xfs_dir2_leaf_addname(args);
324 else
325 rval = xfs_dir2_node_addname(args);
326
327 out_free:
328 kmem_free(args);
329 return rval;
330 }
331
332 /*
333 * If doing a CI lookup and case-insensitive match, dup actual name into
334 * args.value. Return EEXIST for success (ie. name found) or an error.
335 */
336 int
xfs_dir_cilookup_result(struct xfs_da_args * args,const unsigned char * name,int len)337 xfs_dir_cilookup_result(
338 struct xfs_da_args *args,
339 const unsigned char *name,
340 int len)
341 {
342 if (args->cmpresult == XFS_CMP_DIFFERENT)
343 return -ENOENT;
344 if (args->cmpresult != XFS_CMP_CASE ||
345 !(args->op_flags & XFS_DA_OP_CILOOKUP))
346 return -EEXIST;
347
348 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
349 if (!args->value)
350 return -ENOMEM;
351
352 memcpy(args->value, name, len);
353 args->valuelen = len;
354 return -EEXIST;
355 }
356
357 /*
358 * Lookup a name in a directory, give back the inode number.
359 * If ci_name is not NULL, returns the actual name in ci_name if it differs
360 * to name, or ci_name->name is set to NULL for an exact match.
361 */
362
363 int
xfs_dir_lookup(xfs_trans_t * tp,xfs_inode_t * dp,struct xfs_name * name,xfs_ino_t * inum,struct xfs_name * ci_name)364 xfs_dir_lookup(
365 xfs_trans_t *tp,
366 xfs_inode_t *dp,
367 struct xfs_name *name,
368 xfs_ino_t *inum, /* out: inode number */
369 struct xfs_name *ci_name) /* out: actual name if CI match */
370 {
371 struct xfs_da_args *args;
372 int rval;
373 int v; /* type-checking value */
374 int lock_mode;
375
376 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
377 XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
378
379 /*
380 * We need to use KM_NOFS here so that lockdep will not throw false
381 * positive deadlock warnings on a non-transactional lookup path. It is
382 * safe to recurse into inode recalim in that case, but lockdep can't
383 * easily be taught about it. Hence KM_NOFS avoids having to add more
384 * lockdep Doing this avoids having to add a bunch of lockdep class
385 * annotations into the reclaim path for the ilock.
386 */
387 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
388 args->geo = dp->i_mount->m_dir_geo;
389 args->name = name->name;
390 args->namelen = name->len;
391 args->filetype = name->type;
392 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
393 args->dp = dp;
394 args->whichfork = XFS_DATA_FORK;
395 args->trans = tp;
396 args->op_flags = XFS_DA_OP_OKNOENT;
397 if (ci_name)
398 args->op_flags |= XFS_DA_OP_CILOOKUP;
399
400 lock_mode = xfs_ilock_data_map_shared(dp);
401 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
402 rval = xfs_dir2_sf_lookup(args);
403 goto out_check_rval;
404 }
405
406 rval = xfs_dir2_isblock(args, &v);
407 if (rval)
408 goto out_free;
409 if (v) {
410 rval = xfs_dir2_block_lookup(args);
411 goto out_check_rval;
412 }
413
414 rval = xfs_dir2_isleaf(args, &v);
415 if (rval)
416 goto out_free;
417 if (v)
418 rval = xfs_dir2_leaf_lookup(args);
419 else
420 rval = xfs_dir2_node_lookup(args);
421
422 out_check_rval:
423 if (rval == -EEXIST)
424 rval = 0;
425 if (!rval) {
426 *inum = args->inumber;
427 if (ci_name) {
428 ci_name->name = args->value;
429 ci_name->len = args->valuelen;
430 }
431 }
432 out_free:
433 xfs_iunlock(dp, lock_mode);
434 kmem_free(args);
435 return rval;
436 }
437
438 /*
439 * Remove an entry from a directory.
440 */
441 int
xfs_dir_removename(xfs_trans_t * tp,xfs_inode_t * dp,struct xfs_name * name,xfs_ino_t ino,xfs_fsblock_t * first,struct xfs_defer_ops * dfops,xfs_extlen_t total)442 xfs_dir_removename(
443 xfs_trans_t *tp,
444 xfs_inode_t *dp,
445 struct xfs_name *name,
446 xfs_ino_t ino,
447 xfs_fsblock_t *first, /* bmap's firstblock */
448 struct xfs_defer_ops *dfops, /* bmap's freeblock list */
449 xfs_extlen_t total) /* bmap's total block count */
450 {
451 struct xfs_da_args *args;
452 int rval;
453 int v; /* type-checking value */
454
455 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
456 XFS_STATS_INC(dp->i_mount, xs_dir_remove);
457
458 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
459 if (!args)
460 return -ENOMEM;
461
462 args->geo = dp->i_mount->m_dir_geo;
463 args->name = name->name;
464 args->namelen = name->len;
465 args->filetype = name->type;
466 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
467 args->inumber = ino;
468 args->dp = dp;
469 args->firstblock = first;
470 args->dfops = dfops;
471 args->total = total;
472 args->whichfork = XFS_DATA_FORK;
473 args->trans = tp;
474
475 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
476 rval = xfs_dir2_sf_removename(args);
477 goto out_free;
478 }
479
480 rval = xfs_dir2_isblock(args, &v);
481 if (rval)
482 goto out_free;
483 if (v) {
484 rval = xfs_dir2_block_removename(args);
485 goto out_free;
486 }
487
488 rval = xfs_dir2_isleaf(args, &v);
489 if (rval)
490 goto out_free;
491 if (v)
492 rval = xfs_dir2_leaf_removename(args);
493 else
494 rval = xfs_dir2_node_removename(args);
495 out_free:
496 kmem_free(args);
497 return rval;
498 }
499
500 /*
501 * Replace the inode number of a directory entry.
502 */
503 int
xfs_dir_replace(xfs_trans_t * tp,xfs_inode_t * dp,struct xfs_name * name,xfs_ino_t inum,xfs_fsblock_t * first,struct xfs_defer_ops * dfops,xfs_extlen_t total)504 xfs_dir_replace(
505 xfs_trans_t *tp,
506 xfs_inode_t *dp,
507 struct xfs_name *name, /* name of entry to replace */
508 xfs_ino_t inum, /* new inode number */
509 xfs_fsblock_t *first, /* bmap's firstblock */
510 struct xfs_defer_ops *dfops, /* bmap's freeblock list */
511 xfs_extlen_t total) /* bmap's total block count */
512 {
513 struct xfs_da_args *args;
514 int rval;
515 int v; /* type-checking value */
516
517 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
518
519 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
520 if (rval)
521 return rval;
522
523 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
524 if (!args)
525 return -ENOMEM;
526
527 args->geo = dp->i_mount->m_dir_geo;
528 args->name = name->name;
529 args->namelen = name->len;
530 args->filetype = name->type;
531 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
532 args->inumber = inum;
533 args->dp = dp;
534 args->firstblock = first;
535 args->dfops = dfops;
536 args->total = total;
537 args->whichfork = XFS_DATA_FORK;
538 args->trans = tp;
539
540 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
541 rval = xfs_dir2_sf_replace(args);
542 goto out_free;
543 }
544
545 rval = xfs_dir2_isblock(args, &v);
546 if (rval)
547 goto out_free;
548 if (v) {
549 rval = xfs_dir2_block_replace(args);
550 goto out_free;
551 }
552
553 rval = xfs_dir2_isleaf(args, &v);
554 if (rval)
555 goto out_free;
556 if (v)
557 rval = xfs_dir2_leaf_replace(args);
558 else
559 rval = xfs_dir2_node_replace(args);
560 out_free:
561 kmem_free(args);
562 return rval;
563 }
564
565 /*
566 * See if this entry can be added to the directory without allocating space.
567 */
568 int
xfs_dir_canenter(xfs_trans_t * tp,xfs_inode_t * dp,struct xfs_name * name)569 xfs_dir_canenter(
570 xfs_trans_t *tp,
571 xfs_inode_t *dp,
572 struct xfs_name *name) /* name of entry to add */
573 {
574 return xfs_dir_createname(tp, dp, name, 0, NULL, NULL, 0);
575 }
576
577 /*
578 * Utility routines.
579 */
580
581 /*
582 * Add a block to the directory.
583 *
584 * This routine is for data and free blocks, not leaf/node blocks which are
585 * handled by xfs_da_grow_inode.
586 */
587 int
xfs_dir2_grow_inode(struct xfs_da_args * args,int space,xfs_dir2_db_t * dbp)588 xfs_dir2_grow_inode(
589 struct xfs_da_args *args,
590 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
591 xfs_dir2_db_t *dbp) /* out: block number added */
592 {
593 struct xfs_inode *dp = args->dp;
594 struct xfs_mount *mp = dp->i_mount;
595 xfs_fileoff_t bno; /* directory offset of new block */
596 int count; /* count of filesystem blocks */
597 int error;
598
599 trace_xfs_dir2_grow_inode(args, space);
600
601 /*
602 * Set lowest possible block in the space requested.
603 */
604 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
605 count = args->geo->fsbcount;
606
607 error = xfs_da_grow_inode_int(args, &bno, count);
608 if (error)
609 return error;
610
611 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
612
613 /*
614 * Update file's size if this is the data space and it grew.
615 */
616 if (space == XFS_DIR2_DATA_SPACE) {
617 xfs_fsize_t size; /* directory file (data) size */
618
619 size = XFS_FSB_TO_B(mp, bno + count);
620 if (size > dp->i_d.di_size) {
621 dp->i_d.di_size = size;
622 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
623 }
624 }
625 return 0;
626 }
627
628 /*
629 * See if the directory is a single-block form directory.
630 */
631 int
xfs_dir2_isblock(struct xfs_da_args * args,int * vp)632 xfs_dir2_isblock(
633 struct xfs_da_args *args,
634 int *vp) /* out: 1 is block, 0 is not block */
635 {
636 xfs_fileoff_t last; /* last file offset */
637 int rval;
638
639 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
640 return rval;
641 rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize;
642 if (rval != 0 && args->dp->i_d.di_size != args->geo->blksize)
643 return -EFSCORRUPTED;
644 *vp = rval;
645 return 0;
646 }
647
648 /*
649 * See if the directory is a single-leaf form directory.
650 */
651 int
xfs_dir2_isleaf(struct xfs_da_args * args,int * vp)652 xfs_dir2_isleaf(
653 struct xfs_da_args *args,
654 int *vp) /* out: 1 is block, 0 is not block */
655 {
656 xfs_fileoff_t last; /* last file offset */
657 int rval;
658
659 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
660 return rval;
661 *vp = last == args->geo->leafblk + args->geo->fsbcount;
662 return 0;
663 }
664
665 /*
666 * Remove the given block from the directory.
667 * This routine is used for data and free blocks, leaf/node are done
668 * by xfs_da_shrink_inode.
669 */
670 int
xfs_dir2_shrink_inode(xfs_da_args_t * args,xfs_dir2_db_t db,struct xfs_buf * bp)671 xfs_dir2_shrink_inode(
672 xfs_da_args_t *args,
673 xfs_dir2_db_t db,
674 struct xfs_buf *bp)
675 {
676 xfs_fileoff_t bno; /* directory file offset */
677 xfs_dablk_t da; /* directory file offset */
678 int done; /* bunmap is finished */
679 xfs_inode_t *dp;
680 int error;
681 xfs_mount_t *mp;
682 xfs_trans_t *tp;
683
684 trace_xfs_dir2_shrink_inode(args, db);
685
686 dp = args->dp;
687 mp = dp->i_mount;
688 tp = args->trans;
689 da = xfs_dir2_db_to_da(args->geo, db);
690
691 /* Unmap the fsblock(s). */
692 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0,
693 args->firstblock, args->dfops, &done);
694 if (error) {
695 /*
696 * ENOSPC actually can happen if we're in a removename with no
697 * space reservation, and the resulting block removal would
698 * cause a bmap btree split or conversion from extents to btree.
699 * This can only happen for un-fragmented directory blocks,
700 * since you need to be punching out the middle of an extent.
701 * In this case we need to leave the block in the file, and not
702 * binval it. So the block has to be in a consistent empty
703 * state and appropriately logged. We don't free up the buffer,
704 * the caller can tell it hasn't happened since it got an error
705 * back.
706 */
707 return error;
708 }
709 ASSERT(done);
710 /*
711 * Invalidate the buffer from the transaction.
712 */
713 xfs_trans_binval(tp, bp);
714 /*
715 * If it's not a data block, we're done.
716 */
717 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
718 return 0;
719 /*
720 * If the block isn't the last one in the directory, we're done.
721 */
722 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
723 return 0;
724 bno = da;
725 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
726 /*
727 * This can't really happen unless there's kernel corruption.
728 */
729 return error;
730 }
731 if (db == args->geo->datablk)
732 ASSERT(bno == 0);
733 else
734 ASSERT(bno > 0);
735 /*
736 * Set the size to the new last block.
737 */
738 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
739 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
740 return 0;
741 }
742