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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#include "xfs_bmap_btree.h"
23#include "xfs_trans_space.h"
24#include "xfs_parent.h"
25#include "xfs_ag.h"
26#include "xfs_ialloc.h"
27
28const struct xfs_name xfs_name_dotdot = {
29 .name = (const unsigned char *)"..",
30 .len = 2,
31 .type = XFS_DIR3_FT_DIR,
32};
33
34const struct xfs_name xfs_name_dot = {
35 .name = (const unsigned char *)".",
36 .len = 1,
37 .type = XFS_DIR3_FT_DIR,
38};
39
40/*
41 * Convert inode mode to directory entry filetype
42 */
43unsigned char
44xfs_mode_to_ftype(
45 int mode)
46{
47 switch (mode & S_IFMT) {
48 case S_IFREG:
49 return XFS_DIR3_FT_REG_FILE;
50 case S_IFDIR:
51 return XFS_DIR3_FT_DIR;
52 case S_IFCHR:
53 return XFS_DIR3_FT_CHRDEV;
54 case S_IFBLK:
55 return XFS_DIR3_FT_BLKDEV;
56 case S_IFIFO:
57 return XFS_DIR3_FT_FIFO;
58 case S_IFSOCK:
59 return XFS_DIR3_FT_SOCK;
60 case S_IFLNK:
61 return XFS_DIR3_FT_SYMLINK;
62 default:
63 return XFS_DIR3_FT_UNKNOWN;
64 }
65}
66
67/*
68 * ASCII case-insensitive (ie. A-Z) support for directories that was
69 * used in IRIX.
70 */
71xfs_dahash_t
72xfs_ascii_ci_hashname(
73 const struct xfs_name *name)
74{
75 xfs_dahash_t hash;
76 int i;
77
78 for (i = 0, hash = 0; i < name->len; i++)
79 hash = xfs_ascii_ci_xfrm(name->name[i]) ^ rol32(hash, 7);
80
81 return hash;
82}
83
84enum xfs_dacmp
85xfs_ascii_ci_compname(
86 struct xfs_da_args *args,
87 const unsigned char *name,
88 int len)
89{
90 enum xfs_dacmp result;
91 int i;
92
93 if (args->namelen != len)
94 return XFS_CMP_DIFFERENT;
95
96 result = XFS_CMP_EXACT;
97 for (i = 0; i < len; i++) {
98 if (args->name[i] == name[i])
99 continue;
100 if (xfs_ascii_ci_xfrm(args->name[i]) !=
101 xfs_ascii_ci_xfrm(name[i]))
102 return XFS_CMP_DIFFERENT;
103 result = XFS_CMP_CASE;
104 }
105
106 return result;
107}
108
109int
110xfs_da_mount(
111 struct xfs_mount *mp)
112{
113 struct xfs_da_geometry *dageo;
114
115
116 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
117 ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
118
119 mp->m_dir_geo = kzalloc(sizeof(struct xfs_da_geometry),
120 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
121 mp->m_attr_geo = kzalloc(sizeof(struct xfs_da_geometry),
122 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
123 if (!mp->m_dir_geo || !mp->m_attr_geo) {
124 kfree(mp->m_dir_geo);
125 kfree(mp->m_attr_geo);
126 return -ENOMEM;
127 }
128
129 /* set up directory geometry */
130 dageo = mp->m_dir_geo;
131 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
132 dageo->fsblog = mp->m_sb.sb_blocklog;
133 dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb);
134 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
135 if (xfs_has_crc(mp)) {
136 dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr);
137 dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr);
138 dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr);
139 dageo->data_entry_offset =
140 sizeof(struct xfs_dir3_data_hdr);
141 } else {
142 dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr);
143 dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr);
144 dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr);
145 dageo->data_entry_offset =
146 sizeof(struct xfs_dir2_data_hdr);
147 }
148 dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) /
149 sizeof(struct xfs_dir2_leaf_entry);
150 dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) /
151 sizeof(xfs_dir2_data_off_t);
152
153 dageo->data_first_offset = dageo->data_entry_offset +
154 xfs_dir2_data_entsize(mp, 1) +
155 xfs_dir2_data_entsize(mp, 2);
156
157 /*
158 * Now we've set up the block conversion variables, we can calculate the
159 * segment block constants using the geometry structure.
160 */
161 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
162 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
163 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
164 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
165 (uint)sizeof(xfs_da_node_entry_t);
166 dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >>
167 mp->m_sb.sb_blocklog;
168 dageo->magicpct = (dageo->blksize * 37) / 100;
169
170 /* set up attribute geometry - single fsb only */
171 dageo = mp->m_attr_geo;
172 dageo->blklog = mp->m_sb.sb_blocklog;
173 dageo->fsblog = mp->m_sb.sb_blocklog;
174 dageo->blksize = 1 << dageo->blklog;
175 dageo->fsbcount = 1;
176 dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size;
177 dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
178 (uint)sizeof(xfs_da_node_entry_t);
179
180 if (xfs_has_large_extent_counts(mp))
181 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
182 else
183 dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
184
185 dageo->magicpct = (dageo->blksize * 37) / 100;
186 return 0;
187}
188
189void
190xfs_da_unmount(
191 struct xfs_mount *mp)
192{
193 kfree(mp->m_dir_geo);
194 kfree(mp->m_attr_geo);
195}
196
197/*
198 * Return 1 if directory contains only "." and "..".
199 */
200int
201xfs_dir_isempty(
202 xfs_inode_t *dp)
203{
204 xfs_dir2_sf_hdr_t *sfp;
205
206 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
207 if (dp->i_disk_size == 0) /* might happen during shutdown. */
208 return 1;
209 if (dp->i_disk_size > xfs_inode_data_fork_size(dp))
210 return 0;
211 sfp = dp->i_df.if_data;
212 return !sfp->count;
213}
214
215/*
216 * Validate a given inode number.
217 */
218int
219xfs_dir_ino_validate(
220 xfs_mount_t *mp,
221 xfs_ino_t ino)
222{
223 bool ino_ok = xfs_verify_dir_ino(mp, ino);
224
225 if (XFS_IS_CORRUPT(mp, !ino_ok) ||
226 XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) {
227 xfs_warn(mp, "Invalid inode number 0x%Lx",
228 (unsigned long long) ino);
229 return -EFSCORRUPTED;
230 }
231 return 0;
232}
233
234/*
235 * Initialize a directory with its "." and ".." entries.
236 */
237int
238xfs_dir_init(
239 xfs_trans_t *tp,
240 xfs_inode_t *dp,
241 xfs_inode_t *pdp)
242{
243 struct xfs_da_args *args;
244 int error;
245
246 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
247 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
248 if (error)
249 return error;
250
251 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
252 if (!args)
253 return -ENOMEM;
254
255 args->geo = dp->i_mount->m_dir_geo;
256 args->dp = dp;
257 args->trans = tp;
258 args->owner = dp->i_ino;
259 error = xfs_dir2_sf_create(args, pdp->i_ino);
260 kfree(args);
261 return error;
262}
263
264enum xfs_dir2_fmt
265xfs_dir2_format(
266 struct xfs_da_args *args,
267 int *error)
268{
269 struct xfs_inode *dp = args->dp;
270 struct xfs_mount *mp = dp->i_mount;
271 struct xfs_da_geometry *geo = mp->m_dir_geo;
272 xfs_fileoff_t eof;
273
274 xfs_assert_ilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL);
275
276 *error = 0;
277 if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
278 return XFS_DIR2_FMT_SF;
279
280 *error = xfs_bmap_last_offset(dp, &eof, XFS_DATA_FORK);
281 if (*error)
282 return XFS_DIR2_FMT_ERROR;
283
284 if (eof == XFS_B_TO_FSB(mp, geo->blksize)) {
285 if (XFS_IS_CORRUPT(mp, dp->i_disk_size != geo->blksize)) {
286 xfs_da_mark_sick(args);
287 *error = -EFSCORRUPTED;
288 return XFS_DIR2_FMT_ERROR;
289 }
290 return XFS_DIR2_FMT_BLOCK;
291 }
292 if (eof == geo->leafblk + geo->fsbcount)
293 return XFS_DIR2_FMT_LEAF;
294 return XFS_DIR2_FMT_NODE;
295}
296
297int
298xfs_dir_createname_args(
299 struct xfs_da_args *args)
300{
301 int error;
302
303 if (!args->inumber)
304 args->op_flags |= XFS_DA_OP_JUSTCHECK;
305
306 switch (xfs_dir2_format(args, &error)) {
307 case XFS_DIR2_FMT_SF:
308 return xfs_dir2_sf_addname(args);
309 case XFS_DIR2_FMT_BLOCK:
310 return xfs_dir2_block_addname(args);
311 case XFS_DIR2_FMT_LEAF:
312 return xfs_dir2_leaf_addname(args);
313 case XFS_DIR2_FMT_NODE:
314 return xfs_dir2_node_addname(args);
315 default:
316 return error;
317 }
318}
319
320/*
321 * Enter a name in a directory, or check for available space.
322 * If inum is 0, only the available space test is performed.
323 */
324int
325xfs_dir_createname(
326 struct xfs_trans *tp,
327 struct xfs_inode *dp,
328 const struct xfs_name *name,
329 xfs_ino_t inum, /* new entry inode number */
330 xfs_extlen_t total) /* bmap's total block count */
331{
332 struct xfs_da_args *args;
333 int rval;
334
335 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
336
337 if (inum) {
338 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
339 if (rval)
340 return rval;
341 XFS_STATS_INC(dp->i_mount, xs_dir_create);
342 }
343
344 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
345 if (!args)
346 return -ENOMEM;
347
348 args->geo = dp->i_mount->m_dir_geo;
349 args->name = name->name;
350 args->namelen = name->len;
351 args->filetype = name->type;
352 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
353 args->inumber = inum;
354 args->dp = dp;
355 args->total = total;
356 args->whichfork = XFS_DATA_FORK;
357 args->trans = tp;
358 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
359 args->owner = dp->i_ino;
360
361 rval = xfs_dir_createname_args(args);
362 kfree(args);
363 return rval;
364}
365
366/*
367 * If doing a CI lookup and case-insensitive match, dup actual name into
368 * args.value. Return EEXIST for success (ie. name found) or an error.
369 */
370int
371xfs_dir_cilookup_result(
372 struct xfs_da_args *args,
373 const unsigned char *name,
374 int len)
375{
376 if (args->cmpresult == XFS_CMP_DIFFERENT)
377 return -ENOENT;
378 if (args->cmpresult != XFS_CMP_CASE ||
379 !(args->op_flags & XFS_DA_OP_CILOOKUP))
380 return -EEXIST;
381
382 args->value = kmalloc(len,
383 GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_RETRY_MAYFAIL);
384 if (!args->value)
385 return -ENOMEM;
386
387 memcpy(args->value, name, len);
388 args->valuelen = len;
389 return -EEXIST;
390}
391
392int
393xfs_dir_lookup_args(
394 struct xfs_da_args *args)
395{
396 int error;
397
398 switch (xfs_dir2_format(args, &error)) {
399 case XFS_DIR2_FMT_SF:
400 error = xfs_dir2_sf_lookup(args);
401 break;
402 case XFS_DIR2_FMT_BLOCK:
403 error = xfs_dir2_block_lookup(args);
404 break;
405 case XFS_DIR2_FMT_LEAF:
406 error = xfs_dir2_leaf_lookup(args);
407 break;
408 case XFS_DIR2_FMT_NODE:
409 error = xfs_dir2_node_lookup(args);
410 break;
411 default:
412 break;
413 }
414
415 if (error != -EEXIST)
416 return error;
417 return 0;
418}
419
420/*
421 * Lookup a name in a directory, give back the inode number.
422 * If ci_name is not NULL, returns the actual name in ci_name if it differs
423 * to name, or ci_name->name is set to NULL for an exact match.
424 */
425
426int
427xfs_dir_lookup(
428 struct xfs_trans *tp,
429 struct xfs_inode *dp,
430 const struct xfs_name *name,
431 xfs_ino_t *inum, /* out: inode number */
432 struct xfs_name *ci_name) /* out: actual name if CI match */
433{
434 struct xfs_da_args *args;
435 int rval;
436 int lock_mode;
437
438 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
439 XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
440
441 args = kzalloc(sizeof(*args),
442 GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL);
443 args->geo = dp->i_mount->m_dir_geo;
444 args->name = name->name;
445 args->namelen = name->len;
446 args->filetype = name->type;
447 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
448 args->dp = dp;
449 args->whichfork = XFS_DATA_FORK;
450 args->trans = tp;
451 args->op_flags = XFS_DA_OP_OKNOENT;
452 args->owner = dp->i_ino;
453 if (ci_name)
454 args->op_flags |= XFS_DA_OP_CILOOKUP;
455
456 lock_mode = xfs_ilock_data_map_shared(dp);
457 rval = xfs_dir_lookup_args(args);
458 if (!rval) {
459 *inum = args->inumber;
460 if (ci_name) {
461 ci_name->name = args->value;
462 ci_name->len = args->valuelen;
463 }
464 }
465 xfs_iunlock(dp, lock_mode);
466 kfree(args);
467 return rval;
468}
469
470int
471xfs_dir_removename_args(
472 struct xfs_da_args *args)
473{
474 int error;
475
476 switch (xfs_dir2_format(args, &error)) {
477 case XFS_DIR2_FMT_SF:
478 return xfs_dir2_sf_removename(args);
479 case XFS_DIR2_FMT_BLOCK:
480 return xfs_dir2_block_removename(args);
481 case XFS_DIR2_FMT_LEAF:
482 return xfs_dir2_leaf_removename(args);
483 case XFS_DIR2_FMT_NODE:
484 return xfs_dir2_node_removename(args);
485 default:
486 return error;
487 }
488}
489
490/*
491 * Remove an entry from a directory.
492 */
493int
494xfs_dir_removename(
495 struct xfs_trans *tp,
496 struct xfs_inode *dp,
497 const struct xfs_name *name,
498 xfs_ino_t ino,
499 xfs_extlen_t total) /* bmap's total block count */
500{
501 struct xfs_da_args *args;
502 int rval;
503
504 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
505 XFS_STATS_INC(dp->i_mount, xs_dir_remove);
506
507 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
508 if (!args)
509 return -ENOMEM;
510
511 args->geo = dp->i_mount->m_dir_geo;
512 args->name = name->name;
513 args->namelen = name->len;
514 args->filetype = name->type;
515 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
516 args->inumber = ino;
517 args->dp = dp;
518 args->total = total;
519 args->whichfork = XFS_DATA_FORK;
520 args->trans = tp;
521 args->owner = dp->i_ino;
522 rval = xfs_dir_removename_args(args);
523 kfree(args);
524 return rval;
525}
526
527int
528xfs_dir_replace_args(
529 struct xfs_da_args *args)
530{
531 int error;
532
533 switch (xfs_dir2_format(args, &error)) {
534 case XFS_DIR2_FMT_SF:
535 return xfs_dir2_sf_replace(args);
536 case XFS_DIR2_FMT_BLOCK:
537 return xfs_dir2_block_replace(args);
538 case XFS_DIR2_FMT_LEAF:
539 return xfs_dir2_leaf_replace(args);
540 case XFS_DIR2_FMT_NODE:
541 return xfs_dir2_node_replace(args);
542 default:
543 return error;
544 }
545}
546
547/*
548 * Replace the inode number of a directory entry.
549 */
550int
551xfs_dir_replace(
552 struct xfs_trans *tp,
553 struct xfs_inode *dp,
554 const struct xfs_name *name, /* name of entry to replace */
555 xfs_ino_t inum, /* new inode number */
556 xfs_extlen_t total) /* bmap's total block count */
557{
558 struct xfs_da_args *args;
559 int rval;
560
561 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
562
563 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
564 if (rval)
565 return rval;
566
567 args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
568 if (!args)
569 return -ENOMEM;
570
571 args->geo = dp->i_mount->m_dir_geo;
572 args->name = name->name;
573 args->namelen = name->len;
574 args->filetype = name->type;
575 args->hashval = xfs_dir2_hashname(dp->i_mount, name);
576 args->inumber = inum;
577 args->dp = dp;
578 args->total = total;
579 args->whichfork = XFS_DATA_FORK;
580 args->trans = tp;
581 args->owner = dp->i_ino;
582 rval = xfs_dir_replace_args(args);
583 kfree(args);
584 return rval;
585}
586
587/*
588 * See if this entry can be added to the directory without allocating space.
589 */
590int
591xfs_dir_canenter(
592 struct xfs_trans *tp,
593 struct xfs_inode *dp,
594 const struct xfs_name *name) /* name of entry to add */
595{
596 return xfs_dir_createname(tp, dp, name, 0, 0);
597}
598
599/*
600 * Utility routines.
601 */
602
603/*
604 * Add a block to the directory.
605 *
606 * This routine is for data and free blocks, not leaf/node blocks which are
607 * handled by xfs_da_grow_inode.
608 */
609int
610xfs_dir2_grow_inode(
611 struct xfs_da_args *args,
612 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
613 xfs_dir2_db_t *dbp) /* out: block number added */
614{
615 struct xfs_inode *dp = args->dp;
616 struct xfs_mount *mp = dp->i_mount;
617 xfs_fileoff_t bno; /* directory offset of new block */
618 int count; /* count of filesystem blocks */
619 int error;
620
621 trace_xfs_dir2_grow_inode(args, space);
622
623 /*
624 * Set lowest possible block in the space requested.
625 */
626 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
627 count = args->geo->fsbcount;
628
629 error = xfs_da_grow_inode_int(args, &bno, count);
630 if (error)
631 return error;
632
633 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
634
635 /*
636 * Update file's size if this is the data space and it grew.
637 */
638 if (space == XFS_DIR2_DATA_SPACE) {
639 xfs_fsize_t size; /* directory file (data) size */
640
641 size = XFS_FSB_TO_B(mp, bno + count);
642 if (size > dp->i_disk_size) {
643 dp->i_disk_size = size;
644 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
645 }
646 }
647 return 0;
648}
649
650/*
651 * Remove the given block from the directory.
652 * This routine is used for data and free blocks, leaf/node are done
653 * by xfs_da_shrink_inode.
654 */
655int
656xfs_dir2_shrink_inode(
657 struct xfs_da_args *args,
658 xfs_dir2_db_t db,
659 struct xfs_buf *bp)
660{
661 xfs_fileoff_t bno; /* directory file offset */
662 xfs_dablk_t da; /* directory file offset */
663 int done; /* bunmap is finished */
664 struct xfs_inode *dp;
665 int error;
666 struct xfs_mount *mp;
667 struct xfs_trans *tp;
668
669 trace_xfs_dir2_shrink_inode(args, db);
670
671 dp = args->dp;
672 mp = dp->i_mount;
673 tp = args->trans;
674 da = xfs_dir2_db_to_da(args->geo, db);
675
676 /* Unmap the fsblock(s). */
677 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done);
678 if (error) {
679 /*
680 * ENOSPC actually can happen if we're in a removename with no
681 * space reservation, and the resulting block removal would
682 * cause a bmap btree split or conversion from extents to btree.
683 * This can only happen for un-fragmented directory blocks,
684 * since you need to be punching out the middle of an extent.
685 * In this case we need to leave the block in the file, and not
686 * binval it. So the block has to be in a consistent empty
687 * state and appropriately logged. We don't free up the buffer,
688 * the caller can tell it hasn't happened since it got an error
689 * back.
690 */
691 return error;
692 }
693 ASSERT(done);
694 /*
695 * Invalidate the buffer from the transaction.
696 */
697 xfs_trans_binval(tp, bp);
698 /*
699 * If it's not a data block, we're done.
700 */
701 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
702 return 0;
703 /*
704 * If the block isn't the last one in the directory, we're done.
705 */
706 if (dp->i_disk_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
707 return 0;
708 bno = da;
709 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
710 /*
711 * This can't really happen unless there's kernel corruption.
712 */
713 return error;
714 }
715 if (db == args->geo->datablk)
716 ASSERT(bno == 0);
717 else
718 ASSERT(bno > 0);
719 /*
720 * Set the size to the new last block.
721 */
722 dp->i_disk_size = XFS_FSB_TO_B(mp, bno);
723 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
724 return 0;
725}
726
727/* Returns true if the directory entry name is valid. */
728bool
729xfs_dir2_namecheck(
730 const void *name,
731 size_t length)
732{
733 /*
734 * MAXNAMELEN includes the trailing null, but (name/length) leave it
735 * out, so use >= for the length check.
736 */
737 if (length >= MAXNAMELEN)
738 return false;
739
740 /* There shouldn't be any slashes or nulls here */
741 return !memchr(name, '/', length) && !memchr(name, 0, length);
742}
743
744xfs_dahash_t
745xfs_dir2_hashname(
746 struct xfs_mount *mp,
747 const struct xfs_name *name)
748{
749 if (unlikely(xfs_has_asciici(mp)))
750 return xfs_ascii_ci_hashname(name);
751 return xfs_da_hashname(name->name, name->len);
752}
753
754enum xfs_dacmp
755xfs_dir2_compname(
756 struct xfs_da_args *args,
757 const unsigned char *name,
758 int len)
759{
760 if (unlikely(xfs_has_asciici(args->dp->i_mount)))
761 return xfs_ascii_ci_compname(args, name, len);
762 return xfs_da_compname(args, name, len);
763}
764
765#ifdef CONFIG_XFS_LIVE_HOOKS
766/*
767 * Use a static key here to reduce the overhead of directory live update hooks.
768 * If the compiler supports jump labels, the static branch will be replaced by
769 * a nop sled when there are no hook users. Online fsck is currently the only
770 * caller, so this is a reasonable tradeoff.
771 *
772 * Note: Patching the kernel code requires taking the cpu hotplug lock. Other
773 * parts of the kernel allocate memory with that lock held, which means that
774 * XFS callers cannot hold any locks that might be used by memory reclaim or
775 * writeback when calling the static_branch_{inc,dec} functions.
776 */
777DEFINE_STATIC_XFS_HOOK_SWITCH(xfs_dir_hooks_switch);
778
779void
780xfs_dir_hook_disable(void)
781{
782 xfs_hooks_switch_off(&xfs_dir_hooks_switch);
783}
784
785void
786xfs_dir_hook_enable(void)
787{
788 xfs_hooks_switch_on(&xfs_dir_hooks_switch);
789}
790
791/* Call hooks for a directory update relating to a child dirent update. */
792inline void
793xfs_dir_update_hook(
794 struct xfs_inode *dp,
795 struct xfs_inode *ip,
796 int delta,
797 const struct xfs_name *name)
798{
799 if (xfs_hooks_switched_on(&xfs_dir_hooks_switch)) {
800 struct xfs_dir_update_params p = {
801 .dp = dp,
802 .ip = ip,
803 .delta = delta,
804 .name = name,
805 };
806 struct xfs_mount *mp = ip->i_mount;
807
808 xfs_hooks_call(&mp->m_dir_update_hooks, 0, &p);
809 }
810}
811
812/* Call the specified function during a directory update. */
813int
814xfs_dir_hook_add(
815 struct xfs_mount *mp,
816 struct xfs_dir_hook *hook)
817{
818 return xfs_hooks_add(&mp->m_dir_update_hooks, &hook->dirent_hook);
819}
820
821/* Stop calling the specified function during a directory update. */
822void
823xfs_dir_hook_del(
824 struct xfs_mount *mp,
825 struct xfs_dir_hook *hook)
826{
827 xfs_hooks_del(&mp->m_dir_update_hooks, &hook->dirent_hook);
828}
829
830/* Configure directory update hook functions. */
831void
832xfs_dir_hook_setup(
833 struct xfs_dir_hook *hook,
834 notifier_fn_t mod_fn)
835{
836 xfs_hook_setup(&hook->dirent_hook, mod_fn);
837}
838#endif /* CONFIG_XFS_LIVE_HOOKS */
839
840/*
841 * Given a directory @dp, a newly allocated inode @ip, and a @name, link @ip
842 * into @dp under the given @name. If @ip is a directory, it will be
843 * initialized. Both inodes must have the ILOCK held and the transaction must
844 * have sufficient blocks reserved.
845 */
846int
847xfs_dir_create_child(
848 struct xfs_trans *tp,
849 unsigned int resblks,
850 struct xfs_dir_update *du)
851{
852 struct xfs_inode *dp = du->dp;
853 const struct xfs_name *name = du->name;
854 struct xfs_inode *ip = du->ip;
855 int error;
856
857 xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
858 xfs_assert_ilocked(dp, XFS_ILOCK_EXCL);
859
860 error = xfs_dir_createname(tp, dp, name, ip->i_ino, resblks);
861 if (error) {
862 ASSERT(error != -ENOSPC);
863 return error;
864 }
865
866 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
867 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
868
869 if (S_ISDIR(VFS_I(ip)->i_mode)) {
870 error = xfs_dir_init(tp, ip, dp);
871 if (error)
872 return error;
873
874 xfs_bumplink(tp, dp);
875 }
876
877 /*
878 * If we have parent pointers, we need to add the attribute containing
879 * the parent information now.
880 */
881 if (du->ppargs) {
882 error = xfs_parent_addname(tp, du->ppargs, dp, name, ip);
883 if (error)
884 return error;
885 }
886
887 xfs_dir_update_hook(dp, ip, 1, name);
888 return 0;
889}
890
891/*
892 * Given a directory @dp, an existing non-directory inode @ip, and a @name,
893 * link @ip into @dp under the given @name. Both inodes must have the ILOCK
894 * held.
895 */
896int
897xfs_dir_add_child(
898 struct xfs_trans *tp,
899 unsigned int resblks,
900 struct xfs_dir_update *du)
901{
902 struct xfs_inode *dp = du->dp;
903 const struct xfs_name *name = du->name;
904 struct xfs_inode *ip = du->ip;
905 struct xfs_mount *mp = tp->t_mountp;
906 int error;
907
908 xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
909 xfs_assert_ilocked(dp, XFS_ILOCK_EXCL);
910 ASSERT(!S_ISDIR(VFS_I(ip)->i_mode));
911
912 if (!resblks) {
913 error = xfs_dir_canenter(tp, dp, name);
914 if (error)
915 return error;
916 }
917
918 /*
919 * Handle initial link state of O_TMPFILE inode
920 */
921 if (VFS_I(ip)->i_nlink == 0) {
922 struct xfs_perag *pag;
923
924 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
925 error = xfs_iunlink_remove(tp, pag, ip);
926 xfs_perag_put(pag);
927 if (error)
928 return error;
929 }
930
931 error = xfs_dir_createname(tp, dp, name, ip->i_ino, resblks);
932 if (error)
933 return error;
934
935 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
936 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
937
938 xfs_bumplink(tp, ip);
939
940 /*
941 * If we have parent pointers, we now need to add the parent record to
942 * the attribute fork of the inode. If this is the initial parent
943 * attribute, we need to create it correctly, otherwise we can just add
944 * the parent to the inode.
945 */
946 if (du->ppargs) {
947 error = xfs_parent_addname(tp, du->ppargs, dp, name, ip);
948 if (error)
949 return error;
950 }
951
952 xfs_dir_update_hook(dp, ip, 1, name);
953 return 0;
954}
955
956/*
957 * Given a directory @dp, a child @ip, and a @name, remove the (@name, @ip)
958 * entry from the directory. Both inodes must have the ILOCK held.
959 */
960int
961xfs_dir_remove_child(
962 struct xfs_trans *tp,
963 unsigned int resblks,
964 struct xfs_dir_update *du)
965{
966 struct xfs_inode *dp = du->dp;
967 const struct xfs_name *name = du->name;
968 struct xfs_inode *ip = du->ip;
969 int error;
970
971 xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
972 xfs_assert_ilocked(dp, XFS_ILOCK_EXCL);
973
974 /*
975 * If we're removing a directory perform some additional validation.
976 */
977 if (S_ISDIR(VFS_I(ip)->i_mode)) {
978 ASSERT(VFS_I(ip)->i_nlink >= 2);
979 if (VFS_I(ip)->i_nlink != 2)
980 return -ENOTEMPTY;
981 if (!xfs_dir_isempty(ip))
982 return -ENOTEMPTY;
983
984 /* Drop the link from ip's "..". */
985 error = xfs_droplink(tp, dp);
986 if (error)
987 return error;
988
989 /* Drop the "." link from ip to self. */
990 error = xfs_droplink(tp, ip);
991 if (error)
992 return error;
993
994 /*
995 * Point the unlinked child directory's ".." entry to the root
996 * directory to eliminate back-references to inodes that may
997 * get freed before the child directory is closed. If the fs
998 * gets shrunk, this can lead to dirent inode validation errors.
999 */
1000 if (dp->i_ino != tp->t_mountp->m_sb.sb_rootino) {
1001 error = xfs_dir_replace(tp, ip, &xfs_name_dotdot,
1002 tp->t_mountp->m_sb.sb_rootino, 0);
1003 if (error)
1004 return error;
1005 }
1006 } else {
1007 /*
1008 * When removing a non-directory we need to log the parent
1009 * inode here. For a directory this is done implicitly
1010 * by the xfs_droplink call for the ".." entry.
1011 */
1012 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1013 }
1014 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1015
1016 /* Drop the link from dp to ip. */
1017 error = xfs_droplink(tp, ip);
1018 if (error)
1019 return error;
1020
1021 error = xfs_dir_removename(tp, dp, name, ip->i_ino, resblks);
1022 if (error) {
1023 ASSERT(error != -ENOENT);
1024 return error;
1025 }
1026
1027 /* Remove parent pointer. */
1028 if (du->ppargs) {
1029 error = xfs_parent_removename(tp, du->ppargs, dp, name, ip);
1030 if (error)
1031 return error;
1032 }
1033
1034 xfs_dir_update_hook(dp, ip, -1, name);
1035 return 0;
1036}
1037
1038/*
1039 * Exchange the entry (@name1, @ip1) in directory @dp1 with the entry (@name2,
1040 * @ip2) in directory @dp2, and update '..' @ip1 and @ip2's entries as needed.
1041 * @ip1 and @ip2 need not be of the same type.
1042 *
1043 * All inodes must have the ILOCK held, and both entries must already exist.
1044 */
1045int
1046xfs_dir_exchange_children(
1047 struct xfs_trans *tp,
1048 struct xfs_dir_update *du1,
1049 struct xfs_dir_update *du2,
1050 unsigned int spaceres)
1051{
1052 struct xfs_inode *dp1 = du1->dp;
1053 const struct xfs_name *name1 = du1->name;
1054 struct xfs_inode *ip1 = du1->ip;
1055 struct xfs_inode *dp2 = du2->dp;
1056 const struct xfs_name *name2 = du2->name;
1057 struct xfs_inode *ip2 = du2->ip;
1058 int ip1_flags = 0;
1059 int ip2_flags = 0;
1060 int dp2_flags = 0;
1061 int error;
1062
1063 /* Swap inode number for dirent in first parent */
1064 error = xfs_dir_replace(tp, dp1, name1, ip2->i_ino, spaceres);
1065 if (error)
1066 return error;
1067
1068 /* Swap inode number for dirent in second parent */
1069 error = xfs_dir_replace(tp, dp2, name2, ip1->i_ino, spaceres);
1070 if (error)
1071 return error;
1072
1073 /*
1074 * If we're renaming one or more directories across different parents,
1075 * update the respective ".." entries (and link counts) to match the new
1076 * parents.
1077 */
1078 if (dp1 != dp2) {
1079 dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
1080
1081 if (S_ISDIR(VFS_I(ip2)->i_mode)) {
1082 error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot,
1083 dp1->i_ino, spaceres);
1084 if (error)
1085 return error;
1086
1087 /* transfer ip2 ".." reference to dp1 */
1088 if (!S_ISDIR(VFS_I(ip1)->i_mode)) {
1089 error = xfs_droplink(tp, dp2);
1090 if (error)
1091 return error;
1092 xfs_bumplink(tp, dp1);
1093 }
1094
1095 /*
1096 * Although ip1 isn't changed here, userspace needs
1097 * to be warned about the change, so that applications
1098 * relying on it (like backup ones), will properly
1099 * notify the change
1100 */
1101 ip1_flags |= XFS_ICHGTIME_CHG;
1102 ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
1103 }
1104
1105 if (S_ISDIR(VFS_I(ip1)->i_mode)) {
1106 error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot,
1107 dp2->i_ino, spaceres);
1108 if (error)
1109 return error;
1110
1111 /* transfer ip1 ".." reference to dp2 */
1112 if (!S_ISDIR(VFS_I(ip2)->i_mode)) {
1113 error = xfs_droplink(tp, dp1);
1114 if (error)
1115 return error;
1116 xfs_bumplink(tp, dp2);
1117 }
1118
1119 /*
1120 * Although ip2 isn't changed here, userspace needs
1121 * to be warned about the change, so that applications
1122 * relying on it (like backup ones), will properly
1123 * notify the change
1124 */
1125 ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
1126 ip2_flags |= XFS_ICHGTIME_CHG;
1127 }
1128 }
1129
1130 if (ip1_flags) {
1131 xfs_trans_ichgtime(tp, ip1, ip1_flags);
1132 xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE);
1133 }
1134 if (ip2_flags) {
1135 xfs_trans_ichgtime(tp, ip2, ip2_flags);
1136 xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE);
1137 }
1138 if (dp2_flags) {
1139 xfs_trans_ichgtime(tp, dp2, dp2_flags);
1140 xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE);
1141 }
1142 xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1143 xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
1144
1145 /* Schedule parent pointer replacements */
1146 if (du1->ppargs) {
1147 error = xfs_parent_replacename(tp, du1->ppargs, dp1, name1,
1148 dp2, name2, ip1);
1149 if (error)
1150 return error;
1151 }
1152
1153 if (du2->ppargs) {
1154 error = xfs_parent_replacename(tp, du2->ppargs, dp2, name2,
1155 dp1, name1, ip2);
1156 if (error)
1157 return error;
1158 }
1159
1160 /*
1161 * Inform our hook clients that we've finished an exchange operation as
1162 * follows: removed the source and target files from their directories;
1163 * added the target to the source directory; and added the source to
1164 * the target directory. All inodes are locked, so it's ok to model a
1165 * rename this way so long as we say we deleted entries before we add
1166 * new ones.
1167 */
1168 xfs_dir_update_hook(dp1, ip1, -1, name1);
1169 xfs_dir_update_hook(dp2, ip2, -1, name2);
1170 xfs_dir_update_hook(dp1, ip2, 1, name1);
1171 xfs_dir_update_hook(dp2, ip1, 1, name2);
1172 return 0;
1173}
1174
1175/*
1176 * Given an entry (@src_name, @src_ip) in directory @src_dp, make the entry
1177 * @target_name in directory @target_dp point to @src_ip and remove the
1178 * original entry, cleaning up everything left behind.
1179 *
1180 * Cleanup involves dropping a link count on @target_ip, and either removing
1181 * the (@src_name, @src_ip) entry from @src_dp or simply replacing the entry
1182 * with (@src_name, @wip) if a whiteout inode @wip is supplied.
1183 *
1184 * All inodes must have the ILOCK held. We assume that if @src_ip is a
1185 * directory then its '..' doesn't already point to @target_dp, and that @wip
1186 * is a freshly allocated whiteout.
1187 */
1188int
1189xfs_dir_rename_children(
1190 struct xfs_trans *tp,
1191 struct xfs_dir_update *du_src,
1192 struct xfs_dir_update *du_tgt,
1193 unsigned int spaceres,
1194 struct xfs_dir_update *du_wip)
1195{
1196 struct xfs_mount *mp = tp->t_mountp;
1197 struct xfs_inode *src_dp = du_src->dp;
1198 const struct xfs_name *src_name = du_src->name;
1199 struct xfs_inode *src_ip = du_src->ip;
1200 struct xfs_inode *target_dp = du_tgt->dp;
1201 const struct xfs_name *target_name = du_tgt->name;
1202 struct xfs_inode *target_ip = du_tgt->ip;
1203 bool new_parent = (src_dp != target_dp);
1204 bool src_is_directory;
1205 int error;
1206
1207 src_is_directory = S_ISDIR(VFS_I(src_ip)->i_mode);
1208
1209 /*
1210 * Check for expected errors before we dirty the transaction
1211 * so we can return an error without a transaction abort.
1212 */
1213 if (target_ip == NULL) {
1214 /*
1215 * If there's no space reservation, check the entry will
1216 * fit before actually inserting it.
1217 */
1218 if (!spaceres) {
1219 error = xfs_dir_canenter(tp, target_dp, target_name);
1220 if (error)
1221 return error;
1222 }
1223 } else {
1224 /*
1225 * If target exists and it's a directory, check that whether
1226 * it can be destroyed.
1227 */
1228 if (S_ISDIR(VFS_I(target_ip)->i_mode) &&
1229 (!xfs_dir_isempty(target_ip) ||
1230 (VFS_I(target_ip)->i_nlink > 2)))
1231 return -EEXIST;
1232 }
1233
1234 /*
1235 * Directory entry creation below may acquire the AGF. Remove
1236 * the whiteout from the unlinked list first to preserve correct
1237 * AGI/AGF locking order. This dirties the transaction so failures
1238 * after this point will abort and log recovery will clean up the
1239 * mess.
1240 *
1241 * For whiteouts, we need to bump the link count on the whiteout
1242 * inode. After this point, we have a real link, clear the tmpfile
1243 * state flag from the inode so it doesn't accidentally get misused
1244 * in future.
1245 */
1246 if (du_wip->ip) {
1247 struct xfs_perag *pag;
1248
1249 ASSERT(VFS_I(du_wip->ip)->i_nlink == 0);
1250
1251 pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, du_wip->ip->i_ino));
1252 error = xfs_iunlink_remove(tp, pag, du_wip->ip);
1253 xfs_perag_put(pag);
1254 if (error)
1255 return error;
1256
1257 xfs_bumplink(tp, du_wip->ip);
1258 }
1259
1260 /*
1261 * Set up the target.
1262 */
1263 if (target_ip == NULL) {
1264 /*
1265 * If target does not exist and the rename crosses
1266 * directories, adjust the target directory link count
1267 * to account for the ".." reference from the new entry.
1268 */
1269 error = xfs_dir_createname(tp, target_dp, target_name,
1270 src_ip->i_ino, spaceres);
1271 if (error)
1272 return error;
1273
1274 xfs_trans_ichgtime(tp, target_dp,
1275 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1276
1277 if (new_parent && src_is_directory) {
1278 xfs_bumplink(tp, target_dp);
1279 }
1280 } else { /* target_ip != NULL */
1281 /*
1282 * Link the source inode under the target name.
1283 * If the source inode is a directory and we are moving
1284 * it across directories, its ".." entry will be
1285 * inconsistent until we replace that down below.
1286 *
1287 * In case there is already an entry with the same
1288 * name at the destination directory, remove it first.
1289 */
1290 error = xfs_dir_replace(tp, target_dp, target_name,
1291 src_ip->i_ino, spaceres);
1292 if (error)
1293 return error;
1294
1295 xfs_trans_ichgtime(tp, target_dp,
1296 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1297
1298 /*
1299 * Decrement the link count on the target since the target
1300 * dir no longer points to it.
1301 */
1302 error = xfs_droplink(tp, target_ip);
1303 if (error)
1304 return error;
1305
1306 if (src_is_directory) {
1307 /*
1308 * Drop the link from the old "." entry.
1309 */
1310 error = xfs_droplink(tp, target_ip);
1311 if (error)
1312 return error;
1313 }
1314 } /* target_ip != NULL */
1315
1316 /*
1317 * Remove the source.
1318 */
1319 if (new_parent && src_is_directory) {
1320 /*
1321 * Rewrite the ".." entry to point to the new
1322 * directory.
1323 */
1324 error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
1325 target_dp->i_ino, spaceres);
1326 ASSERT(error != -EEXIST);
1327 if (error)
1328 return error;
1329 }
1330
1331 /*
1332 * We always want to hit the ctime on the source inode.
1333 *
1334 * This isn't strictly required by the standards since the source
1335 * inode isn't really being changed, but old unix file systems did
1336 * it and some incremental backup programs won't work without it.
1337 */
1338 xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
1339 xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);
1340
1341 /*
1342 * Adjust the link count on src_dp. This is necessary when
1343 * renaming a directory, either within one parent when
1344 * the target existed, or across two parent directories.
1345 */
1346 if (src_is_directory && (new_parent || target_ip != NULL)) {
1347
1348 /*
1349 * Decrement link count on src_directory since the
1350 * entry that's moved no longer points to it.
1351 */
1352 error = xfs_droplink(tp, src_dp);
1353 if (error)
1354 return error;
1355 }
1356
1357 /*
1358 * For whiteouts, we only need to update the source dirent with the
1359 * inode number of the whiteout inode rather than removing it
1360 * altogether.
1361 */
1362 if (du_wip->ip)
1363 error = xfs_dir_replace(tp, src_dp, src_name, du_wip->ip->i_ino,
1364 spaceres);
1365 else
1366 error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
1367 spaceres);
1368 if (error)
1369 return error;
1370
1371 xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1372 xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
1373 if (new_parent)
1374 xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
1375
1376 /* Schedule parent pointer updates. */
1377 if (du_wip->ppargs) {
1378 error = xfs_parent_addname(tp, du_wip->ppargs, src_dp,
1379 src_name, du_wip->ip);
1380 if (error)
1381 return error;
1382 }
1383
1384 if (du_src->ppargs) {
1385 error = xfs_parent_replacename(tp, du_src->ppargs, src_dp,
1386 src_name, target_dp, target_name, src_ip);
1387 if (error)
1388 return error;
1389 }
1390
1391 if (du_tgt->ppargs) {
1392 error = xfs_parent_removename(tp, du_tgt->ppargs, target_dp,
1393 target_name, target_ip);
1394 if (error)
1395 return error;
1396 }
1397
1398 /*
1399 * Inform our hook clients that we've finished a rename operation as
1400 * follows: removed the source and target files from their directories;
1401 * that we've added the source to the target directory; and finally
1402 * that we've added the whiteout, if there was one. All inodes are
1403 * locked, so it's ok to model a rename this way so long as we say we
1404 * deleted entries before we add new ones.
1405 */
1406 if (target_ip)
1407 xfs_dir_update_hook(target_dp, target_ip, -1, target_name);
1408 xfs_dir_update_hook(src_dp, src_ip, -1, src_name);
1409 xfs_dir_update_hook(target_dp, src_ip, 1, target_name);
1410 if (du_wip->ip)
1411 xfs_dir_update_hook(src_dp, du_wip->ip, 1, src_name);
1412 return 0;
1413}