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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 = xfs_ascii_ci_xfrm(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 (xfs_ascii_ci_xfrm(args->name[i]) !=
89 xfs_ascii_ci_xfrm(name[i]))
90 return XFS_CMP_DIFFERENT;
91 result = XFS_CMP_CASE;
92 }
93
94 return result;
95}
96
97int
98xfs_da_mount(
99 struct xfs_mount *mp)
100{
101 struct xfs_da_geometry *dageo;
102
103
104 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
105 ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
106
107 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
108 KM_MAYFAIL);
109 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
110 KM_MAYFAIL);
111 if (!mp->m_dir_geo || !mp->m_attr_geo) {
112 kmem_free(mp->m_dir_geo);
113 kmem_free(mp->m_attr_geo);
114 return -ENOMEM;
115 }
116
117 /* set up directory geometry */
118 dageo = mp->m_dir_geo;
119 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
120 dageo->fsblog = mp->m_sb.sb_blocklog;
121 dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb);
122 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
123 if (xfs_has_crc(mp)) {
124 dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr);
125 dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr);
126 dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr);
127 dageo->data_entry_offset =
128 sizeof(struct xfs_dir3_data_hdr);
129 } else {
130 dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr);
131 dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr);
132 dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr);
133 dageo->data_entry_offset =
134 sizeof(struct xfs_dir2_data_hdr);
135 }
136 dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) /
137 sizeof(struct xfs_dir2_leaf_entry);
138 dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) /
139 sizeof(xfs_dir2_data_off_t);
140
141 dageo->data_first_offset = dageo->data_entry_offset +
142 xfs_dir2_data_entsize(mp, 1) +
143 xfs_dir2_data_entsize(mp, 2);
144
145 /*
146 * Now we've set up the block conversion variables, we can calculate the
147 * segment block constants using the geometry structure.
148 */
149 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
150 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
151 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
152 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
153 (uint)sizeof(xfs_da_node_entry_t);
154 dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >>
155 mp->m_sb.sb_blocklog;
156 dageo->magicpct = (dageo->blksize * 37) / 100;
157
158 /* set up attribute geometry - single fsb only */
159 dageo = mp->m_attr_geo;
160 dageo->blklog = mp->m_sb.sb_blocklog;
161 dageo->fsblog = mp->m_sb.sb_blocklog;
162 dageo->blksize = 1 << dageo->blklog;
163 dageo->fsbcount = 1;
164 dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size;
165 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
166 (uint)sizeof(xfs_da_node_entry_t);
167
168 if (xfs_has_large_extent_counts(mp))
169 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
170 else
171 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
172
173 dageo->magicpct = (dageo->blksize * 37) / 100;
174 return 0;
175}
176
177void
178xfs_da_unmount(
179 struct xfs_mount *mp)
180{
181 kmem_free(mp->m_dir_geo);
182 kmem_free(mp->m_attr_geo);
183}
184
185/*
186 * Return 1 if directory contains only "." and "..".
187 */
188int
189xfs_dir_isempty(
190 xfs_inode_t *dp)
191{
192 xfs_dir2_sf_hdr_t *sfp;
193
194 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
195 if (dp->i_disk_size == 0) /* might happen during shutdown. */
196 return 1;
197 if (dp->i_disk_size > xfs_inode_data_fork_size(dp))
198 return 0;
199 sfp = dp->i_df.if_data;
200 return !sfp->count;
201}
202
203/*
204 * Validate a given inode number.
205 */
206int
207xfs_dir_ino_validate(
208 xfs_mount_t *mp,
209 xfs_ino_t ino)
210{
211 bool ino_ok = xfs_verify_dir_ino(mp, ino);
212
213 if (XFS_IS_CORRUPT(mp, !ino_ok) ||
214 XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) {
215 xfs_warn(mp, "Invalid inode number 0x%Lx",
216 (unsigned long long) ino);
217 return -EFSCORRUPTED;
218 }
219 return 0;
220}
221
222/*
223 * Initialize a directory with its "." and ".." entries.
224 */
225int
226xfs_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_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 */
255int
256xfs_dir_createname(
257 struct xfs_trans *tp,
258 struct xfs_inode *dp,
259 const struct xfs_name *name,
260 xfs_ino_t inum, /* new entry inode number */
261 xfs_extlen_t total) /* bmap's total block count */
262{
263 struct xfs_da_args *args;
264 int rval;
265 bool v;
266
267 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
268
269 if (inum) {
270 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
271 if (rval)
272 return rval;
273 XFS_STATS_INC(dp->i_mount, xs_dir_create);
274 }
275
276 args = kmem_zalloc(sizeof(*args), KM_NOFS);
277 if (!args)
278 return -ENOMEM;
279
280 args->geo = dp->i_mount->m_dir_geo;
281 args->name = name->name;
282 args->namelen = name->len;
283 args->filetype = name->type;
284 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
285 args->inumber = inum;
286 args->dp = dp;
287 args->total = total;
288 args->whichfork = XFS_DATA_FORK;
289 args->trans = tp;
290 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
291 if (!inum)
292 args->op_flags |= XFS_DA_OP_JUSTCHECK;
293
294 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
295 rval = xfs_dir2_sf_addname(args);
296 goto out_free;
297 }
298
299 rval = xfs_dir2_isblock(args, &v);
300 if (rval)
301 goto out_free;
302 if (v) {
303 rval = xfs_dir2_block_addname(args);
304 goto out_free;
305 }
306
307 rval = xfs_dir2_isleaf(args, &v);
308 if (rval)
309 goto out_free;
310 if (v)
311 rval = xfs_dir2_leaf_addname(args);
312 else
313 rval = xfs_dir2_node_addname(args);
314
315out_free:
316 kmem_free(args);
317 return rval;
318}
319
320/*
321 * If doing a CI lookup and case-insensitive match, dup actual name into
322 * args.value. Return EEXIST for success (ie. name found) or an error.
323 */
324int
325xfs_dir_cilookup_result(
326 struct xfs_da_args *args,
327 const unsigned char *name,
328 int len)
329{
330 if (args->cmpresult == XFS_CMP_DIFFERENT)
331 return -ENOENT;
332 if (args->cmpresult != XFS_CMP_CASE ||
333 !(args->op_flags & XFS_DA_OP_CILOOKUP))
334 return -EEXIST;
335
336 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
337 if (!args->value)
338 return -ENOMEM;
339
340 memcpy(args->value, name, len);
341 args->valuelen = len;
342 return -EEXIST;
343}
344
345/*
346 * Lookup a name in a directory, give back the inode number.
347 * If ci_name is not NULL, returns the actual name in ci_name if it differs
348 * to name, or ci_name->name is set to NULL for an exact match.
349 */
350
351int
352xfs_dir_lookup(
353 struct xfs_trans *tp,
354 struct xfs_inode *dp,
355 const struct xfs_name *name,
356 xfs_ino_t *inum, /* out: inode number */
357 struct xfs_name *ci_name) /* out: actual name if CI match */
358{
359 struct xfs_da_args *args;
360 int rval;
361 bool v;
362 int lock_mode;
363
364 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
365 XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
366
367 /*
368 * We need to use KM_NOFS here so that lockdep will not throw false
369 * positive deadlock warnings on a non-transactional lookup path. It is
370 * safe to recurse into inode recalim in that case, but lockdep can't
371 * easily be taught about it. Hence KM_NOFS avoids having to add more
372 * lockdep Doing this avoids having to add a bunch of lockdep class
373 * annotations into the reclaim path for the ilock.
374 */
375 args = kmem_zalloc(sizeof(*args), KM_NOFS);
376 args->geo = dp->i_mount->m_dir_geo;
377 args->name = name->name;
378 args->namelen = name->len;
379 args->filetype = name->type;
380 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
381 args->dp = dp;
382 args->whichfork = XFS_DATA_FORK;
383 args->trans = tp;
384 args->op_flags = XFS_DA_OP_OKNOENT;
385 if (ci_name)
386 args->op_flags |= XFS_DA_OP_CILOOKUP;
387
388 lock_mode = xfs_ilock_data_map_shared(dp);
389 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
390 rval = xfs_dir2_sf_lookup(args);
391 goto out_check_rval;
392 }
393
394 rval = xfs_dir2_isblock(args, &v);
395 if (rval)
396 goto out_free;
397 if (v) {
398 rval = xfs_dir2_block_lookup(args);
399 goto out_check_rval;
400 }
401
402 rval = xfs_dir2_isleaf(args, &v);
403 if (rval)
404 goto out_free;
405 if (v)
406 rval = xfs_dir2_leaf_lookup(args);
407 else
408 rval = xfs_dir2_node_lookup(args);
409
410out_check_rval:
411 if (rval == -EEXIST)
412 rval = 0;
413 if (!rval) {
414 *inum = args->inumber;
415 if (ci_name) {
416 ci_name->name = args->value;
417 ci_name->len = args->valuelen;
418 }
419 }
420out_free:
421 xfs_iunlock(dp, lock_mode);
422 kmem_free(args);
423 return rval;
424}
425
426/*
427 * Remove an entry from a directory.
428 */
429int
430xfs_dir_removename(
431 struct xfs_trans *tp,
432 struct xfs_inode *dp,
433 struct xfs_name *name,
434 xfs_ino_t ino,
435 xfs_extlen_t total) /* bmap's total block count */
436{
437 struct xfs_da_args *args;
438 int rval;
439 bool v;
440
441 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
442 XFS_STATS_INC(dp->i_mount, xs_dir_remove);
443
444 args = kmem_zalloc(sizeof(*args), KM_NOFS);
445 if (!args)
446 return -ENOMEM;
447
448 args->geo = dp->i_mount->m_dir_geo;
449 args->name = name->name;
450 args->namelen = name->len;
451 args->filetype = name->type;
452 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
453 args->inumber = ino;
454 args->dp = dp;
455 args->total = total;
456 args->whichfork = XFS_DATA_FORK;
457 args->trans = tp;
458
459 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
460 rval = xfs_dir2_sf_removename(args);
461 goto out_free;
462 }
463
464 rval = xfs_dir2_isblock(args, &v);
465 if (rval)
466 goto out_free;
467 if (v) {
468 rval = xfs_dir2_block_removename(args);
469 goto out_free;
470 }
471
472 rval = xfs_dir2_isleaf(args, &v);
473 if (rval)
474 goto out_free;
475 if (v)
476 rval = xfs_dir2_leaf_removename(args);
477 else
478 rval = xfs_dir2_node_removename(args);
479out_free:
480 kmem_free(args);
481 return rval;
482}
483
484/*
485 * Replace the inode number of a directory entry.
486 */
487int
488xfs_dir_replace(
489 struct xfs_trans *tp,
490 struct xfs_inode *dp,
491 const struct xfs_name *name, /* name of entry to replace */
492 xfs_ino_t inum, /* new inode number */
493 xfs_extlen_t total) /* bmap's total block count */
494{
495 struct xfs_da_args *args;
496 int rval;
497 bool v;
498
499 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
500
501 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
502 if (rval)
503 return rval;
504
505 args = kmem_zalloc(sizeof(*args), KM_NOFS);
506 if (!args)
507 return -ENOMEM;
508
509 args->geo = dp->i_mount->m_dir_geo;
510 args->name = name->name;
511 args->namelen = name->len;
512 args->filetype = name->type;
513 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
514 args->inumber = inum;
515 args->dp = dp;
516 args->total = total;
517 args->whichfork = XFS_DATA_FORK;
518 args->trans = tp;
519
520 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
521 rval = xfs_dir2_sf_replace(args);
522 goto out_free;
523 }
524
525 rval = xfs_dir2_isblock(args, &v);
526 if (rval)
527 goto out_free;
528 if (v) {
529 rval = xfs_dir2_block_replace(args);
530 goto out_free;
531 }
532
533 rval = xfs_dir2_isleaf(args, &v);
534 if (rval)
535 goto out_free;
536 if (v)
537 rval = xfs_dir2_leaf_replace(args);
538 else
539 rval = xfs_dir2_node_replace(args);
540out_free:
541 kmem_free(args);
542 return rval;
543}
544
545/*
546 * See if this entry can be added to the directory without allocating space.
547 */
548int
549xfs_dir_canenter(
550 xfs_trans_t *tp,
551 xfs_inode_t *dp,
552 struct xfs_name *name) /* name of entry to add */
553{
554 return xfs_dir_createname(tp, dp, name, 0, 0);
555}
556
557/*
558 * Utility routines.
559 */
560
561/*
562 * Add a block to the directory.
563 *
564 * This routine is for data and free blocks, not leaf/node blocks which are
565 * handled by xfs_da_grow_inode.
566 */
567int
568xfs_dir2_grow_inode(
569 struct xfs_da_args *args,
570 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
571 xfs_dir2_db_t *dbp) /* out: block number added */
572{
573 struct xfs_inode *dp = args->dp;
574 struct xfs_mount *mp = dp->i_mount;
575 xfs_fileoff_t bno; /* directory offset of new block */
576 int count; /* count of filesystem blocks */
577 int error;
578
579 trace_xfs_dir2_grow_inode(args, space);
580
581 /*
582 * Set lowest possible block in the space requested.
583 */
584 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
585 count = args->geo->fsbcount;
586
587 error = xfs_da_grow_inode_int(args, &bno, count);
588 if (error)
589 return error;
590
591 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
592
593 /*
594 * Update file's size if this is the data space and it grew.
595 */
596 if (space == XFS_DIR2_DATA_SPACE) {
597 xfs_fsize_t size; /* directory file (data) size */
598
599 size = XFS_FSB_TO_B(mp, bno + count);
600 if (size > dp->i_disk_size) {
601 dp->i_disk_size = size;
602 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
603 }
604 }
605 return 0;
606}
607
608/*
609 * See if the directory is a single-block form directory.
610 */
611int
612xfs_dir2_isblock(
613 struct xfs_da_args *args,
614 bool *isblock)
615{
616 struct xfs_mount *mp = args->dp->i_mount;
617 xfs_fileoff_t eof;
618 int error;
619
620 error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
621 if (error)
622 return error;
623
624 *isblock = false;
625 if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize)
626 return 0;
627
628 *isblock = true;
629 if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize))
630 return -EFSCORRUPTED;
631 return 0;
632}
633
634/*
635 * See if the directory is a single-leaf form directory.
636 */
637int
638xfs_dir2_isleaf(
639 struct xfs_da_args *args,
640 bool *isleaf)
641{
642 xfs_fileoff_t eof;
643 int error;
644
645 error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
646 if (error)
647 return error;
648
649 *isleaf = false;
650 if (eof != args->geo->leafblk + args->geo->fsbcount)
651 return 0;
652
653 *isleaf = true;
654 return 0;
655}
656
657/*
658 * Remove the given block from the directory.
659 * This routine is used for data and free blocks, leaf/node are done
660 * by xfs_da_shrink_inode.
661 */
662int
663xfs_dir2_shrink_inode(
664 struct xfs_da_args *args,
665 xfs_dir2_db_t db,
666 struct xfs_buf *bp)
667{
668 xfs_fileoff_t bno; /* directory file offset */
669 xfs_dablk_t da; /* directory file offset */
670 int done; /* bunmap is finished */
671 struct xfs_inode *dp;
672 int error;
673 struct xfs_mount *mp;
674 struct xfs_trans *tp;
675
676 trace_xfs_dir2_shrink_inode(args, db);
677
678 dp = args->dp;
679 mp = dp->i_mount;
680 tp = args->trans;
681 da = xfs_dir2_db_to_da(args->geo, db);
682
683 /* Unmap the fsblock(s). */
684 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done);
685 if (error) {
686 /*
687 * ENOSPC actually can happen if we're in a removename with no
688 * space reservation, and the resulting block removal would
689 * cause a bmap btree split or conversion from extents to btree.
690 * This can only happen for un-fragmented directory blocks,
691 * since you need to be punching out the middle of an extent.
692 * In this case we need to leave the block in the file, and not
693 * binval it. So the block has to be in a consistent empty
694 * state and appropriately logged. We don't free up the buffer,
695 * the caller can tell it hasn't happened since it got an error
696 * back.
697 */
698 return error;
699 }
700 ASSERT(done);
701 /*
702 * Invalidate the buffer from the transaction.
703 */
704 xfs_trans_binval(tp, bp);
705 /*
706 * If it's not a data block, we're done.
707 */
708 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
709 return 0;
710 /*
711 * If the block isn't the last one in the directory, we're done.
712 */
713 if (dp->i_disk_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
714 return 0;
715 bno = da;
716 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
717 /*
718 * This can't really happen unless there's kernel corruption.
719 */
720 return error;
721 }
722 if (db == args->geo->datablk)
723 ASSERT(bno == 0);
724 else
725 ASSERT(bno > 0);
726 /*
727 * Set the size to the new last block.
728 */
729 dp->i_disk_size = XFS_FSB_TO_B(mp, bno);
730 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
731 return 0;
732}
733
734/* Returns true if the directory entry name is valid. */
735bool
736xfs_dir2_namecheck(
737 const void *name,
738 size_t length)
739{
740 /*
741 * MAXNAMELEN includes the trailing null, but (name/length) leave it
742 * out, so use >= for the length check.
743 */
744 if (length >= MAXNAMELEN)
745 return false;
746
747 /* There shouldn't be any slashes or nulls here */
748 return !memchr(name, '/', length) && !memchr(name, 0, length);
749}
750
751xfs_dahash_t
752xfs_dir2_hashname(
753 struct xfs_mount *mp,
754 const struct xfs_name *name)
755{
756 if (unlikely(xfs_has_asciici(mp)))
757 return xfs_ascii_ci_hashname(name);
758 return xfs_da_hashname(name->name, name->len);
759}
760
761enum xfs_dacmp
762xfs_dir2_compname(
763 struct xfs_da_args *args,
764 const unsigned char *name,
765 int len)
766{
767 if (unlikely(xfs_has_asciici(args->dp->i_mount)))
768 return xfs_ascii_ci_compname(args, name, len);
769 return xfs_da_compname(args, name, len);
770}
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#include "xfs_health.h"
22
23const struct xfs_name xfs_name_dotdot = {
24 .name = (const unsigned char *)"..",
25 .len = 2,
26 .type = XFS_DIR3_FT_DIR,
27};
28
29const struct xfs_name xfs_name_dot = {
30 .name = (const unsigned char *)".",
31 .len = 1,
32 .type = XFS_DIR3_FT_DIR,
33};
34
35/*
36 * Convert inode mode to directory entry filetype
37 */
38unsigned char
39xfs_mode_to_ftype(
40 int mode)
41{
42 switch (mode & S_IFMT) {
43 case S_IFREG:
44 return XFS_DIR3_FT_REG_FILE;
45 case S_IFDIR:
46 return XFS_DIR3_FT_DIR;
47 case S_IFCHR:
48 return XFS_DIR3_FT_CHRDEV;
49 case S_IFBLK:
50 return XFS_DIR3_FT_BLKDEV;
51 case S_IFIFO:
52 return XFS_DIR3_FT_FIFO;
53 case S_IFSOCK:
54 return XFS_DIR3_FT_SOCK;
55 case S_IFLNK:
56 return XFS_DIR3_FT_SYMLINK;
57 default:
58 return XFS_DIR3_FT_UNKNOWN;
59 }
60}
61
62/*
63 * ASCII case-insensitive (ie. A-Z) support for directories that was
64 * used in IRIX.
65 */
66xfs_dahash_t
67xfs_ascii_ci_hashname(
68 const struct xfs_name *name)
69{
70 xfs_dahash_t hash;
71 int i;
72
73 for (i = 0, hash = 0; i < name->len; i++)
74 hash = xfs_ascii_ci_xfrm(name->name[i]) ^ rol32(hash, 7);
75
76 return hash;
77}
78
79enum xfs_dacmp
80xfs_ascii_ci_compname(
81 struct xfs_da_args *args,
82 const unsigned char *name,
83 int len)
84{
85 enum xfs_dacmp result;
86 int i;
87
88 if (args->namelen != len)
89 return XFS_CMP_DIFFERENT;
90
91 result = XFS_CMP_EXACT;
92 for (i = 0; i < len; i++) {
93 if (args->name[i] == name[i])
94 continue;
95 if (xfs_ascii_ci_xfrm(args->name[i]) !=
96 xfs_ascii_ci_xfrm(name[i]))
97 return XFS_CMP_DIFFERENT;
98 result = XFS_CMP_CASE;
99 }
100
101 return result;
102}
103
104int
105xfs_da_mount(
106 struct xfs_mount *mp)
107{
108 struct xfs_da_geometry *dageo;
109
110
111 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
112 ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
113
114 mp->m_dir_geo = kzalloc(sizeof(struct xfs_da_geometry),
115 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
116 mp->m_attr_geo = kzalloc(sizeof(struct xfs_da_geometry),
117 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
118 if (!mp->m_dir_geo || !mp->m_attr_geo) {
119 kfree(mp->m_dir_geo);
120 kfree(mp->m_attr_geo);
121 return -ENOMEM;
122 }
123
124 /* set up directory geometry */
125 dageo = mp->m_dir_geo;
126 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
127 dageo->fsblog = mp->m_sb.sb_blocklog;
128 dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb);
129 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
130 if (xfs_has_crc(mp)) {
131 dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr);
132 dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr);
133 dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr);
134 dageo->data_entry_offset =
135 sizeof(struct xfs_dir3_data_hdr);
136 } else {
137 dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr);
138 dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr);
139 dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr);
140 dageo->data_entry_offset =
141 sizeof(struct xfs_dir2_data_hdr);
142 }
143 dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) /
144 sizeof(struct xfs_dir2_leaf_entry);
145 dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) /
146 sizeof(xfs_dir2_data_off_t);
147
148 dageo->data_first_offset = dageo->data_entry_offset +
149 xfs_dir2_data_entsize(mp, 1) +
150 xfs_dir2_data_entsize(mp, 2);
151
152 /*
153 * Now we've set up the block conversion variables, we can calculate the
154 * segment block constants using the geometry structure.
155 */
156 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
157 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
158 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
159 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
160 (uint)sizeof(xfs_da_node_entry_t);
161 dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >>
162 mp->m_sb.sb_blocklog;
163 dageo->magicpct = (dageo->blksize * 37) / 100;
164
165 /* set up attribute geometry - single fsb only */
166 dageo = mp->m_attr_geo;
167 dageo->blklog = mp->m_sb.sb_blocklog;
168 dageo->fsblog = mp->m_sb.sb_blocklog;
169 dageo->blksize = 1 << dageo->blklog;
170 dageo->fsbcount = 1;
171 dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size;
172 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
173 (uint)sizeof(xfs_da_node_entry_t);
174
175 if (xfs_has_large_extent_counts(mp))
176 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
177 else
178 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
179
180 dageo->magicpct = (dageo->blksize * 37) / 100;
181 return 0;
182}
183
184void
185xfs_da_unmount(
186 struct xfs_mount *mp)
187{
188 kfree(mp->m_dir_geo);
189 kfree(mp->m_attr_geo);
190}
191
192/*
193 * Return 1 if directory contains only "." and "..".
194 */
195int
196xfs_dir_isempty(
197 xfs_inode_t *dp)
198{
199 xfs_dir2_sf_hdr_t *sfp;
200
201 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
202 if (dp->i_disk_size == 0) /* might happen during shutdown. */
203 return 1;
204 if (dp->i_disk_size > xfs_inode_data_fork_size(dp))
205 return 0;
206 sfp = dp->i_df.if_data;
207 return !sfp->count;
208}
209
210/*
211 * Validate a given inode number.
212 */
213int
214xfs_dir_ino_validate(
215 xfs_mount_t *mp,
216 xfs_ino_t ino)
217{
218 bool ino_ok = xfs_verify_dir_ino(mp, ino);
219
220 if (XFS_IS_CORRUPT(mp, !ino_ok) ||
221 XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) {
222 xfs_warn(mp, "Invalid inode number 0x%Lx",
223 (unsigned long long) ino);
224 return -EFSCORRUPTED;
225 }
226 return 0;
227}
228
229/*
230 * Initialize a directory with its "." and ".." entries.
231 */
232int
233xfs_dir_init(
234 xfs_trans_t *tp,
235 xfs_inode_t *dp,
236 xfs_inode_t *pdp)
237{
238 struct xfs_da_args *args;
239 int error;
240
241 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
242 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
243 if (error)
244 return error;
245
246 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
247 if (!args)
248 return -ENOMEM;
249
250 args->geo = dp->i_mount->m_dir_geo;
251 args->dp = dp;
252 args->trans = tp;
253 error = xfs_dir2_sf_create(args, pdp->i_ino);
254 kfree(args);
255 return error;
256}
257
258/*
259 * Enter a name in a directory, or check for available space.
260 * If inum is 0, only the available space test is performed.
261 */
262int
263xfs_dir_createname(
264 struct xfs_trans *tp,
265 struct xfs_inode *dp,
266 const struct xfs_name *name,
267 xfs_ino_t inum, /* new entry inode number */
268 xfs_extlen_t total) /* bmap's total block count */
269{
270 struct xfs_da_args *args;
271 int rval;
272 bool v;
273
274 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
275
276 if (inum) {
277 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
278 if (rval)
279 return rval;
280 XFS_STATS_INC(dp->i_mount, xs_dir_create);
281 }
282
283 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
284 if (!args)
285 return -ENOMEM;
286
287 args->geo = dp->i_mount->m_dir_geo;
288 args->name = name->name;
289 args->namelen = name->len;
290 args->filetype = name->type;
291 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
292 args->inumber = inum;
293 args->dp = dp;
294 args->total = total;
295 args->whichfork = XFS_DATA_FORK;
296 args->trans = tp;
297 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
298 if (!inum)
299 args->op_flags |= XFS_DA_OP_JUSTCHECK;
300
301 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
302 rval = xfs_dir2_sf_addname(args);
303 goto out_free;
304 }
305
306 rval = xfs_dir2_isblock(args, &v);
307 if (rval)
308 goto out_free;
309 if (v) {
310 rval = xfs_dir2_block_addname(args);
311 goto out_free;
312 }
313
314 rval = xfs_dir2_isleaf(args, &v);
315 if (rval)
316 goto out_free;
317 if (v)
318 rval = xfs_dir2_leaf_addname(args);
319 else
320 rval = xfs_dir2_node_addname(args);
321
322out_free:
323 kfree(args);
324 return rval;
325}
326
327/*
328 * If doing a CI lookup and case-insensitive match, dup actual name into
329 * args.value. Return EEXIST for success (ie. name found) or an error.
330 */
331int
332xfs_dir_cilookup_result(
333 struct xfs_da_args *args,
334 const unsigned char *name,
335 int len)
336{
337 if (args->cmpresult == XFS_CMP_DIFFERENT)
338 return -ENOENT;
339 if (args->cmpresult != XFS_CMP_CASE ||
340 !(args->op_flags & XFS_DA_OP_CILOOKUP))
341 return -EEXIST;
342
343 args->value = kmalloc(len,
344 GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_RETRY_MAYFAIL);
345 if (!args->value)
346 return -ENOMEM;
347
348 memcpy(args->value, name, len);
349 args->valuelen = len;
350 return -EEXIST;
351}
352
353/*
354 * Lookup a name in a directory, give back the inode number.
355 * If ci_name is not NULL, returns the actual name in ci_name if it differs
356 * to name, or ci_name->name is set to NULL for an exact match.
357 */
358
359int
360xfs_dir_lookup(
361 struct xfs_trans *tp,
362 struct xfs_inode *dp,
363 const struct xfs_name *name,
364 xfs_ino_t *inum, /* out: inode number */
365 struct xfs_name *ci_name) /* out: actual name if CI match */
366{
367 struct xfs_da_args *args;
368 int rval;
369 bool v;
370 int lock_mode;
371
372 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
373 XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
374
375 args = kzalloc(sizeof(*args),
376 GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL);
377 args->geo = dp->i_mount->m_dir_geo;
378 args->name = name->name;
379 args->namelen = name->len;
380 args->filetype = name->type;
381 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
382 args->dp = dp;
383 args->whichfork = XFS_DATA_FORK;
384 args->trans = tp;
385 args->op_flags = XFS_DA_OP_OKNOENT;
386 if (ci_name)
387 args->op_flags |= XFS_DA_OP_CILOOKUP;
388
389 lock_mode = xfs_ilock_data_map_shared(dp);
390 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
391 rval = xfs_dir2_sf_lookup(args);
392 goto out_check_rval;
393 }
394
395 rval = xfs_dir2_isblock(args, &v);
396 if (rval)
397 goto out_free;
398 if (v) {
399 rval = xfs_dir2_block_lookup(args);
400 goto out_check_rval;
401 }
402
403 rval = xfs_dir2_isleaf(args, &v);
404 if (rval)
405 goto out_free;
406 if (v)
407 rval = xfs_dir2_leaf_lookup(args);
408 else
409 rval = xfs_dir2_node_lookup(args);
410
411out_check_rval:
412 if (rval == -EEXIST)
413 rval = 0;
414 if (!rval) {
415 *inum = args->inumber;
416 if (ci_name) {
417 ci_name->name = args->value;
418 ci_name->len = args->valuelen;
419 }
420 }
421out_free:
422 xfs_iunlock(dp, lock_mode);
423 kfree(args);
424 return rval;
425}
426
427/*
428 * Remove an entry from a directory.
429 */
430int
431xfs_dir_removename(
432 struct xfs_trans *tp,
433 struct xfs_inode *dp,
434 struct xfs_name *name,
435 xfs_ino_t ino,
436 xfs_extlen_t total) /* bmap's total block count */
437{
438 struct xfs_da_args *args;
439 int rval;
440 bool v;
441
442 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
443 XFS_STATS_INC(dp->i_mount, xs_dir_remove);
444
445 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
446 if (!args)
447 return -ENOMEM;
448
449 args->geo = dp->i_mount->m_dir_geo;
450 args->name = name->name;
451 args->namelen = name->len;
452 args->filetype = name->type;
453 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
454 args->inumber = ino;
455 args->dp = dp;
456 args->total = total;
457 args->whichfork = XFS_DATA_FORK;
458 args->trans = tp;
459
460 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
461 rval = xfs_dir2_sf_removename(args);
462 goto out_free;
463 }
464
465 rval = xfs_dir2_isblock(args, &v);
466 if (rval)
467 goto out_free;
468 if (v) {
469 rval = xfs_dir2_block_removename(args);
470 goto out_free;
471 }
472
473 rval = xfs_dir2_isleaf(args, &v);
474 if (rval)
475 goto out_free;
476 if (v)
477 rval = xfs_dir2_leaf_removename(args);
478 else
479 rval = xfs_dir2_node_removename(args);
480out_free:
481 kfree(args);
482 return rval;
483}
484
485/*
486 * Replace the inode number of a directory entry.
487 */
488int
489xfs_dir_replace(
490 struct xfs_trans *tp,
491 struct xfs_inode *dp,
492 const struct xfs_name *name, /* name of entry to replace */
493 xfs_ino_t inum, /* new inode number */
494 xfs_extlen_t total) /* bmap's total block count */
495{
496 struct xfs_da_args *args;
497 int rval;
498 bool v;
499
500 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
501
502 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
503 if (rval)
504 return rval;
505
506 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
507 if (!args)
508 return -ENOMEM;
509
510 args->geo = dp->i_mount->m_dir_geo;
511 args->name = name->name;
512 args->namelen = name->len;
513 args->filetype = name->type;
514 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
515 args->inumber = inum;
516 args->dp = dp;
517 args->total = total;
518 args->whichfork = XFS_DATA_FORK;
519 args->trans = tp;
520
521 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
522 rval = xfs_dir2_sf_replace(args);
523 goto out_free;
524 }
525
526 rval = xfs_dir2_isblock(args, &v);
527 if (rval)
528 goto out_free;
529 if (v) {
530 rval = xfs_dir2_block_replace(args);
531 goto out_free;
532 }
533
534 rval = xfs_dir2_isleaf(args, &v);
535 if (rval)
536 goto out_free;
537 if (v)
538 rval = xfs_dir2_leaf_replace(args);
539 else
540 rval = xfs_dir2_node_replace(args);
541out_free:
542 kfree(args);
543 return rval;
544}
545
546/*
547 * See if this entry can be added to the directory without allocating space.
548 */
549int
550xfs_dir_canenter(
551 xfs_trans_t *tp,
552 xfs_inode_t *dp,
553 struct xfs_name *name) /* name of entry to add */
554{
555 return xfs_dir_createname(tp, dp, name, 0, 0);
556}
557
558/*
559 * Utility routines.
560 */
561
562/*
563 * Add a block to the directory.
564 *
565 * This routine is for data and free blocks, not leaf/node blocks which are
566 * handled by xfs_da_grow_inode.
567 */
568int
569xfs_dir2_grow_inode(
570 struct xfs_da_args *args,
571 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
572 xfs_dir2_db_t *dbp) /* out: block number added */
573{
574 struct xfs_inode *dp = args->dp;
575 struct xfs_mount *mp = dp->i_mount;
576 xfs_fileoff_t bno; /* directory offset of new block */
577 int count; /* count of filesystem blocks */
578 int error;
579
580 trace_xfs_dir2_grow_inode(args, space);
581
582 /*
583 * Set lowest possible block in the space requested.
584 */
585 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
586 count = args->geo->fsbcount;
587
588 error = xfs_da_grow_inode_int(args, &bno, count);
589 if (error)
590 return error;
591
592 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
593
594 /*
595 * Update file's size if this is the data space and it grew.
596 */
597 if (space == XFS_DIR2_DATA_SPACE) {
598 xfs_fsize_t size; /* directory file (data) size */
599
600 size = XFS_FSB_TO_B(mp, bno + count);
601 if (size > dp->i_disk_size) {
602 dp->i_disk_size = size;
603 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
604 }
605 }
606 return 0;
607}
608
609/*
610 * See if the directory is a single-block form directory.
611 */
612int
613xfs_dir2_isblock(
614 struct xfs_da_args *args,
615 bool *isblock)
616{
617 struct xfs_mount *mp = args->dp->i_mount;
618 xfs_fileoff_t eof;
619 int error;
620
621 error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
622 if (error)
623 return error;
624
625 *isblock = false;
626 if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize)
627 return 0;
628
629 *isblock = true;
630 if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize)) {
631 xfs_da_mark_sick(args);
632 return -EFSCORRUPTED;
633 }
634 return 0;
635}
636
637/*
638 * See if the directory is a single-leaf form directory.
639 */
640int
641xfs_dir2_isleaf(
642 struct xfs_da_args *args,
643 bool *isleaf)
644{
645 xfs_fileoff_t eof;
646 int error;
647
648 error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
649 if (error)
650 return error;
651
652 *isleaf = false;
653 if (eof != args->geo->leafblk + args->geo->fsbcount)
654 return 0;
655
656 *isleaf = true;
657 return 0;
658}
659
660/*
661 * Remove the given block from the directory.
662 * This routine is used for data and free blocks, leaf/node are done
663 * by xfs_da_shrink_inode.
664 */
665int
666xfs_dir2_shrink_inode(
667 struct xfs_da_args *args,
668 xfs_dir2_db_t db,
669 struct xfs_buf *bp)
670{
671 xfs_fileoff_t bno; /* directory file offset */
672 xfs_dablk_t da; /* directory file offset */
673 int done; /* bunmap is finished */
674 struct xfs_inode *dp;
675 int error;
676 struct xfs_mount *mp;
677 struct xfs_trans *tp;
678
679 trace_xfs_dir2_shrink_inode(args, db);
680
681 dp = args->dp;
682 mp = dp->i_mount;
683 tp = args->trans;
684 da = xfs_dir2_db_to_da(args->geo, db);
685
686 /* Unmap the fsblock(s). */
687 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done);
688 if (error) {
689 /*
690 * ENOSPC actually can happen if we're in a removename with no
691 * space reservation, and the resulting block removal would
692 * cause a bmap btree split or conversion from extents to btree.
693 * This can only happen for un-fragmented directory blocks,
694 * since you need to be punching out the middle of an extent.
695 * In this case we need to leave the block in the file, and not
696 * binval it. So the block has to be in a consistent empty
697 * state and appropriately logged. We don't free up the buffer,
698 * the caller can tell it hasn't happened since it got an error
699 * back.
700 */
701 return error;
702 }
703 ASSERT(done);
704 /*
705 * Invalidate the buffer from the transaction.
706 */
707 xfs_trans_binval(tp, bp);
708 /*
709 * If it's not a data block, we're done.
710 */
711 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
712 return 0;
713 /*
714 * If the block isn't the last one in the directory, we're done.
715 */
716 if (dp->i_disk_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
717 return 0;
718 bno = da;
719 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
720 /*
721 * This can't really happen unless there's kernel corruption.
722 */
723 return error;
724 }
725 if (db == args->geo->datablk)
726 ASSERT(bno == 0);
727 else
728 ASSERT(bno > 0);
729 /*
730 * Set the size to the new last block.
731 */
732 dp->i_disk_size = XFS_FSB_TO_B(mp, bno);
733 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
734 return 0;
735}
736
737/* Returns true if the directory entry name is valid. */
738bool
739xfs_dir2_namecheck(
740 const void *name,
741 size_t length)
742{
743 /*
744 * MAXNAMELEN includes the trailing null, but (name/length) leave it
745 * out, so use >= for the length check.
746 */
747 if (length >= MAXNAMELEN)
748 return false;
749
750 /* There shouldn't be any slashes or nulls here */
751 return !memchr(name, '/', length) && !memchr(name, 0, length);
752}
753
754xfs_dahash_t
755xfs_dir2_hashname(
756 struct xfs_mount *mp,
757 const struct xfs_name *name)
758{
759 if (unlikely(xfs_has_asciici(mp)))
760 return xfs_ascii_ci_hashname(name);
761 return xfs_da_hashname(name->name, name->len);
762}
763
764enum xfs_dacmp
765xfs_dir2_compname(
766 struct xfs_da_args *args,
767 const unsigned char *name,
768 int len)
769{
770 if (unlikely(xfs_has_asciici(args->dp->i_mount)))
771 return xfs_ascii_ci_compname(args, name, len);
772 return xfs_da_compname(args, name, len);
773}