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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// 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}