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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_trans.h"
15#include "xfs_bmap.h"
16#include "xfs_dir2.h"
17#include "xfs_dir2_priv.h"
18#include "xfs_errortag.h"
19#include "xfs_error.h"
20#include "xfs_trace.h"
21
22const struct xfs_name xfs_name_dotdot = {
23 .name = (const unsigned char *)"..",
24 .len = 2,
25 .type = XFS_DIR3_FT_DIR,
26};
27
28/*
29 * Convert inode mode to directory entry filetype
30 */
31unsigned char
32xfs_mode_to_ftype(
33 int mode)
34{
35 switch (mode & S_IFMT) {
36 case S_IFREG:
37 return XFS_DIR3_FT_REG_FILE;
38 case S_IFDIR:
39 return XFS_DIR3_FT_DIR;
40 case S_IFCHR:
41 return XFS_DIR3_FT_CHRDEV;
42 case S_IFBLK:
43 return XFS_DIR3_FT_BLKDEV;
44 case S_IFIFO:
45 return XFS_DIR3_FT_FIFO;
46 case S_IFSOCK:
47 return XFS_DIR3_FT_SOCK;
48 case S_IFLNK:
49 return XFS_DIR3_FT_SYMLINK;
50 default:
51 return XFS_DIR3_FT_UNKNOWN;
52 }
53}
54
55/*
56 * ASCII case-insensitive (ie. A-Z) support for directories that was
57 * used in IRIX.
58 */
59xfs_dahash_t
60xfs_ascii_ci_hashname(
61 const struct xfs_name *name)
62{
63 xfs_dahash_t hash;
64 int i;
65
66 for (i = 0, hash = 0; i < name->len; i++)
67 hash = tolower(name->name[i]) ^ rol32(hash, 7);
68
69 return hash;
70}
71
72enum xfs_dacmp
73xfs_ascii_ci_compname(
74 struct xfs_da_args *args,
75 const unsigned char *name,
76 int len)
77{
78 enum xfs_dacmp result;
79 int i;
80
81 if (args->namelen != len)
82 return XFS_CMP_DIFFERENT;
83
84 result = XFS_CMP_EXACT;
85 for (i = 0; i < len; i++) {
86 if (args->name[i] == name[i])
87 continue;
88 if (tolower(args->name[i]) != tolower(name[i]))
89 return XFS_CMP_DIFFERENT;
90 result = XFS_CMP_CASE;
91 }
92
93 return result;
94}
95
96int
97xfs_da_mount(
98 struct xfs_mount *mp)
99{
100 struct xfs_da_geometry *dageo;
101
102
103 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
104 ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
105
106 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
107 KM_MAYFAIL);
108 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
109 KM_MAYFAIL);
110 if (!mp->m_dir_geo || !mp->m_attr_geo) {
111 kmem_free(mp->m_dir_geo);
112 kmem_free(mp->m_attr_geo);
113 return -ENOMEM;
114 }
115
116 /* set up directory geometry */
117 dageo = mp->m_dir_geo;
118 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
119 dageo->fsblog = mp->m_sb.sb_blocklog;
120 dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb);
121 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
122 if (xfs_has_crc(mp)) {
123 dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr);
124 dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr);
125 dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr);
126 dageo->data_entry_offset =
127 sizeof(struct xfs_dir3_data_hdr);
128 } else {
129 dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr);
130 dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr);
131 dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr);
132 dageo->data_entry_offset =
133 sizeof(struct xfs_dir2_data_hdr);
134 }
135 dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) /
136 sizeof(struct xfs_dir2_leaf_entry);
137 dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) /
138 sizeof(xfs_dir2_data_off_t);
139
140 dageo->data_first_offset = dageo->data_entry_offset +
141 xfs_dir2_data_entsize(mp, 1) +
142 xfs_dir2_data_entsize(mp, 2);
143
144 /*
145 * Now we've set up the block conversion variables, we can calculate the
146 * segment block constants using the geometry structure.
147 */
148 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
149 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
150 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
151 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
152 (uint)sizeof(xfs_da_node_entry_t);
153 dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >>
154 mp->m_sb.sb_blocklog;
155 dageo->magicpct = (dageo->blksize * 37) / 100;
156
157 /* set up attribute geometry - single fsb only */
158 dageo = mp->m_attr_geo;
159 dageo->blklog = mp->m_sb.sb_blocklog;
160 dageo->fsblog = mp->m_sb.sb_blocklog;
161 dageo->blksize = 1 << dageo->blklog;
162 dageo->fsbcount = 1;
163 dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size;
164 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
165 (uint)sizeof(xfs_da_node_entry_t);
166
167 if (xfs_has_large_extent_counts(mp))
168 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
169 else
170 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
171
172 dageo->magicpct = (dageo->blksize * 37) / 100;
173 return 0;
174}
175
176void
177xfs_da_unmount(
178 struct xfs_mount *mp)
179{
180 kmem_free(mp->m_dir_geo);
181 kmem_free(mp->m_attr_geo);
182}
183
184/*
185 * Return 1 if directory contains only "." and "..".
186 */
187int
188xfs_dir_isempty(
189 xfs_inode_t *dp)
190{
191 xfs_dir2_sf_hdr_t *sfp;
192
193 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
194 if (dp->i_disk_size == 0) /* might happen during shutdown. */
195 return 1;
196 if (dp->i_disk_size > xfs_inode_data_fork_size(dp))
197 return 0;
198 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
199 return !sfp->count;
200}
201
202/*
203 * Validate a given inode number.
204 */
205int
206xfs_dir_ino_validate(
207 xfs_mount_t *mp,
208 xfs_ino_t ino)
209{
210 bool ino_ok = xfs_verify_dir_ino(mp, ino);
211
212 if (XFS_IS_CORRUPT(mp, !ino_ok) ||
213 XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) {
214 xfs_warn(mp, "Invalid inode number 0x%Lx",
215 (unsigned long long) ino);
216 return -EFSCORRUPTED;
217 }
218 return 0;
219}
220
221/*
222 * Initialize a directory with its "." and ".." entries.
223 */
224int
225xfs_dir_init(
226 xfs_trans_t *tp,
227 xfs_inode_t *dp,
228 xfs_inode_t *pdp)
229{
230 struct xfs_da_args *args;
231 int error;
232
233 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
234 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
235 if (error)
236 return error;
237
238 args = kmem_zalloc(sizeof(*args), KM_NOFS);
239 if (!args)
240 return -ENOMEM;
241
242 args->geo = dp->i_mount->m_dir_geo;
243 args->dp = dp;
244 args->trans = tp;
245 error = xfs_dir2_sf_create(args, pdp->i_ino);
246 kmem_free(args);
247 return error;
248}
249
250/*
251 * Enter a name in a directory, or check for available space.
252 * If inum is 0, only the available space test is performed.
253 */
254int
255xfs_dir_createname(
256 struct xfs_trans *tp,
257 struct xfs_inode *dp,
258 const struct xfs_name *name,
259 xfs_ino_t inum, /* new entry inode number */
260 xfs_extlen_t total) /* bmap's total block count */
261{
262 struct xfs_da_args *args;
263 int rval;
264 bool v;
265
266 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
267
268 if (inum) {
269 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
270 if (rval)
271 return rval;
272 XFS_STATS_INC(dp->i_mount, xs_dir_create);
273 }
274
275 args = kmem_zalloc(sizeof(*args), KM_NOFS);
276 if (!args)
277 return -ENOMEM;
278
279 args->geo = dp->i_mount->m_dir_geo;
280 args->name = name->name;
281 args->namelen = name->len;
282 args->filetype = name->type;
283 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
284 args->inumber = inum;
285 args->dp = dp;
286 args->total = total;
287 args->whichfork = XFS_DATA_FORK;
288 args->trans = tp;
289 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
290 if (!inum)
291 args->op_flags |= XFS_DA_OP_JUSTCHECK;
292
293 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
294 rval = xfs_dir2_sf_addname(args);
295 goto out_free;
296 }
297
298 rval = xfs_dir2_isblock(args, &v);
299 if (rval)
300 goto out_free;
301 if (v) {
302 rval = xfs_dir2_block_addname(args);
303 goto out_free;
304 }
305
306 rval = xfs_dir2_isleaf(args, &v);
307 if (rval)
308 goto out_free;
309 if (v)
310 rval = xfs_dir2_leaf_addname(args);
311 else
312 rval = xfs_dir2_node_addname(args);
313
314out_free:
315 kmem_free(args);
316 return rval;
317}
318
319/*
320 * If doing a CI lookup and case-insensitive match, dup actual name into
321 * args.value. Return EEXIST for success (ie. name found) or an error.
322 */
323int
324xfs_dir_cilookup_result(
325 struct xfs_da_args *args,
326 const unsigned char *name,
327 int len)
328{
329 if (args->cmpresult == XFS_CMP_DIFFERENT)
330 return -ENOENT;
331 if (args->cmpresult != XFS_CMP_CASE ||
332 !(args->op_flags & XFS_DA_OP_CILOOKUP))
333 return -EEXIST;
334
335 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
336 if (!args->value)
337 return -ENOMEM;
338
339 memcpy(args->value, name, len);
340 args->valuelen = len;
341 return -EEXIST;
342}
343
344/*
345 * Lookup a name in a directory, give back the inode number.
346 * If ci_name is not NULL, returns the actual name in ci_name if it differs
347 * to name, or ci_name->name is set to NULL for an exact match.
348 */
349
350int
351xfs_dir_lookup(
352 struct xfs_trans *tp,
353 struct xfs_inode *dp,
354 const struct xfs_name *name,
355 xfs_ino_t *inum, /* out: inode number */
356 struct xfs_name *ci_name) /* out: actual name if CI match */
357{
358 struct xfs_da_args *args;
359 int rval;
360 bool v;
361 int lock_mode;
362
363 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
364 XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
365
366 /*
367 * We need to use KM_NOFS here so that lockdep will not throw false
368 * positive deadlock warnings on a non-transactional lookup path. It is
369 * safe to recurse into inode recalim in that case, but lockdep can't
370 * easily be taught about it. Hence KM_NOFS avoids having to add more
371 * lockdep Doing this avoids having to add a bunch of lockdep class
372 * annotations into the reclaim path for the ilock.
373 */
374 args = kmem_zalloc(sizeof(*args), KM_NOFS);
375 args->geo = dp->i_mount->m_dir_geo;
376 args->name = name->name;
377 args->namelen = name->len;
378 args->filetype = name->type;
379 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
380 args->dp = dp;
381 args->whichfork = XFS_DATA_FORK;
382 args->trans = tp;
383 args->op_flags = XFS_DA_OP_OKNOENT;
384 if (ci_name)
385 args->op_flags |= XFS_DA_OP_CILOOKUP;
386
387 lock_mode = xfs_ilock_data_map_shared(dp);
388 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
389 rval = xfs_dir2_sf_lookup(args);
390 goto out_check_rval;
391 }
392
393 rval = xfs_dir2_isblock(args, &v);
394 if (rval)
395 goto out_free;
396 if (v) {
397 rval = xfs_dir2_block_lookup(args);
398 goto out_check_rval;
399 }
400
401 rval = xfs_dir2_isleaf(args, &v);
402 if (rval)
403 goto out_free;
404 if (v)
405 rval = xfs_dir2_leaf_lookup(args);
406 else
407 rval = xfs_dir2_node_lookup(args);
408
409out_check_rval:
410 if (rval == -EEXIST)
411 rval = 0;
412 if (!rval) {
413 *inum = args->inumber;
414 if (ci_name) {
415 ci_name->name = args->value;
416 ci_name->len = args->valuelen;
417 }
418 }
419out_free:
420 xfs_iunlock(dp, lock_mode);
421 kmem_free(args);
422 return rval;
423}
424
425/*
426 * Remove an entry from a directory.
427 */
428int
429xfs_dir_removename(
430 struct xfs_trans *tp,
431 struct xfs_inode *dp,
432 struct xfs_name *name,
433 xfs_ino_t ino,
434 xfs_extlen_t total) /* bmap's total block count */
435{
436 struct xfs_da_args *args;
437 int rval;
438 bool v;
439
440 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
441 XFS_STATS_INC(dp->i_mount, xs_dir_remove);
442
443 args = kmem_zalloc(sizeof(*args), KM_NOFS);
444 if (!args)
445 return -ENOMEM;
446
447 args->geo = dp->i_mount->m_dir_geo;
448 args->name = name->name;
449 args->namelen = name->len;
450 args->filetype = name->type;
451 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
452 args->inumber = ino;
453 args->dp = dp;
454 args->total = total;
455 args->whichfork = XFS_DATA_FORK;
456 args->trans = tp;
457
458 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
459 rval = xfs_dir2_sf_removename(args);
460 goto out_free;
461 }
462
463 rval = xfs_dir2_isblock(args, &v);
464 if (rval)
465 goto out_free;
466 if (v) {
467 rval = xfs_dir2_block_removename(args);
468 goto out_free;
469 }
470
471 rval = xfs_dir2_isleaf(args, &v);
472 if (rval)
473 goto out_free;
474 if (v)
475 rval = xfs_dir2_leaf_removename(args);
476 else
477 rval = xfs_dir2_node_removename(args);
478out_free:
479 kmem_free(args);
480 return rval;
481}
482
483/*
484 * Replace the inode number of a directory entry.
485 */
486int
487xfs_dir_replace(
488 struct xfs_trans *tp,
489 struct xfs_inode *dp,
490 const struct xfs_name *name, /* name of entry to replace */
491 xfs_ino_t inum, /* new inode number */
492 xfs_extlen_t total) /* bmap's total block count */
493{
494 struct xfs_da_args *args;
495 int rval;
496 bool v;
497
498 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
499
500 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
501 if (rval)
502 return rval;
503
504 args = kmem_zalloc(sizeof(*args), KM_NOFS);
505 if (!args)
506 return -ENOMEM;
507
508 args->geo = dp->i_mount->m_dir_geo;
509 args->name = name->name;
510 args->namelen = name->len;
511 args->filetype = name->type;
512 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
513 args->inumber = inum;
514 args->dp = dp;
515 args->total = total;
516 args->whichfork = XFS_DATA_FORK;
517 args->trans = tp;
518
519 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
520 rval = xfs_dir2_sf_replace(args);
521 goto out_free;
522 }
523
524 rval = xfs_dir2_isblock(args, &v);
525 if (rval)
526 goto out_free;
527 if (v) {
528 rval = xfs_dir2_block_replace(args);
529 goto out_free;
530 }
531
532 rval = xfs_dir2_isleaf(args, &v);
533 if (rval)
534 goto out_free;
535 if (v)
536 rval = xfs_dir2_leaf_replace(args);
537 else
538 rval = xfs_dir2_node_replace(args);
539out_free:
540 kmem_free(args);
541 return rval;
542}
543
544/*
545 * See if this entry can be added to the directory without allocating space.
546 */
547int
548xfs_dir_canenter(
549 xfs_trans_t *tp,
550 xfs_inode_t *dp,
551 struct xfs_name *name) /* name of entry to add */
552{
553 return xfs_dir_createname(tp, dp, name, 0, 0);
554}
555
556/*
557 * Utility routines.
558 */
559
560/*
561 * Add a block to the directory.
562 *
563 * This routine is for data and free blocks, not leaf/node blocks which are
564 * handled by xfs_da_grow_inode.
565 */
566int
567xfs_dir2_grow_inode(
568 struct xfs_da_args *args,
569 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
570 xfs_dir2_db_t *dbp) /* out: block number added */
571{
572 struct xfs_inode *dp = args->dp;
573 struct xfs_mount *mp = dp->i_mount;
574 xfs_fileoff_t bno; /* directory offset of new block */
575 int count; /* count of filesystem blocks */
576 int error;
577
578 trace_xfs_dir2_grow_inode(args, space);
579
580 /*
581 * Set lowest possible block in the space requested.
582 */
583 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
584 count = args->geo->fsbcount;
585
586 error = xfs_da_grow_inode_int(args, &bno, count);
587 if (error)
588 return error;
589
590 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
591
592 /*
593 * Update file's size if this is the data space and it grew.
594 */
595 if (space == XFS_DIR2_DATA_SPACE) {
596 xfs_fsize_t size; /* directory file (data) size */
597
598 size = XFS_FSB_TO_B(mp, bno + count);
599 if (size > dp->i_disk_size) {
600 dp->i_disk_size = size;
601 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
602 }
603 }
604 return 0;
605}
606
607/*
608 * See if the directory is a single-block form directory.
609 */
610int
611xfs_dir2_isblock(
612 struct xfs_da_args *args,
613 bool *isblock)
614{
615 struct xfs_mount *mp = args->dp->i_mount;
616 xfs_fileoff_t eof;
617 int error;
618
619 error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
620 if (error)
621 return error;
622
623 *isblock = false;
624 if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize)
625 return 0;
626
627 *isblock = true;
628 if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize))
629 return -EFSCORRUPTED;
630 return 0;
631}
632
633/*
634 * See if the directory is a single-leaf form directory.
635 */
636int
637xfs_dir2_isleaf(
638 struct xfs_da_args *args,
639 bool *isleaf)
640{
641 xfs_fileoff_t eof;
642 int error;
643
644 error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
645 if (error)
646 return error;
647
648 *isleaf = false;
649 if (eof != args->geo->leafblk + args->geo->fsbcount)
650 return 0;
651
652 *isleaf = true;
653 return 0;
654}
655
656/*
657 * Remove the given block from the directory.
658 * This routine is used for data and free blocks, leaf/node are done
659 * by xfs_da_shrink_inode.
660 */
661int
662xfs_dir2_shrink_inode(
663 struct xfs_da_args *args,
664 xfs_dir2_db_t db,
665 struct xfs_buf *bp)
666{
667 xfs_fileoff_t bno; /* directory file offset */
668 xfs_dablk_t da; /* directory file offset */
669 int done; /* bunmap is finished */
670 struct xfs_inode *dp;
671 int error;
672 struct xfs_mount *mp;
673 struct xfs_trans *tp;
674
675 trace_xfs_dir2_shrink_inode(args, db);
676
677 dp = args->dp;
678 mp = dp->i_mount;
679 tp = args->trans;
680 da = xfs_dir2_db_to_da(args->geo, db);
681
682 /* Unmap the fsblock(s). */
683 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &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_disk_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_disk_size = XFS_FSB_TO_B(mp, bno);
729 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
730 return 0;
731}
732
733/* Returns true if the directory entry name is valid. */
734bool
735xfs_dir2_namecheck(
736 const void *name,
737 size_t length)
738{
739 /*
740 * MAXNAMELEN includes the trailing null, but (name/length) leave it
741 * out, so use >= for the length check.
742 */
743 if (length >= MAXNAMELEN)
744 return false;
745
746 /* There shouldn't be any slashes or nulls here */
747 return !memchr(name, '/', length) && !memchr(name, 0, length);
748}
749
750xfs_dahash_t
751xfs_dir2_hashname(
752 struct xfs_mount *mp,
753 const struct xfs_name *name)
754{
755 if (unlikely(xfs_has_asciici(mp)))
756 return xfs_ascii_ci_hashname(name);
757 return xfs_da_hashname(name->name, name->len);
758}
759
760enum xfs_dacmp
761xfs_dir2_compname(
762 struct xfs_da_args *args,
763 const unsigned char *name,
764 int len)
765{
766 if (unlikely(xfs_has_asciici(args->dp->i_mount)))
767 return xfs_ascii_ci_compname(args, name, len);
768 return xfs_da_compname(args, name, len);
769}
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
36struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
37
38/*
39 * Convert inode mode to directory entry filetype
40 */
41unsigned 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 */
67STATIC xfs_dahash_t
68xfs_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
80STATIC enum xfs_dacmp
81xfs_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
104static const struct xfs_nameops xfs_ascii_ci_nameops = {
105 .hashname = xfs_ascii_ci_hashname,
106 .compname = xfs_ascii_ci_compname,
107};
108
109int
110xfs_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
171void
172xfs_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 */
182int
183xfs_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 */
200int
201xfs_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 */
234int
235xfs_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 */
264int
265xfs_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
327out_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 */
336int
337xfs_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
363int
364xfs_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
422out_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 }
432out_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 */
441int
442xfs_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);
495out_free:
496 kmem_free(args);
497 return rval;
498}
499
500/*
501 * Replace the inode number of a directory entry.
502 */
503int
504xfs_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);
560out_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 */
568int
569xfs_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 */
587int
588xfs_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 */
631int
632xfs_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 */
651int
652xfs_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 */
670int
671xfs_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}