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1/*
2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_format.h"
21#include "xfs_log_format.h"
22#include "xfs_trans_resv.h"
23#include "xfs_mount.h"
24#include "xfs_defer.h"
25#include "xfs_da_format.h"
26#include "xfs_da_btree.h"
27#include "xfs_inode.h"
28#include "xfs_trans.h"
29#include "xfs_inode_item.h"
30#include "xfs_bmap.h"
31#include "xfs_dir2.h"
32#include "xfs_dir2_priv.h"
33#include "xfs_ialloc.h"
34#include "xfs_errortag.h"
35#include "xfs_error.h"
36#include "xfs_trace.h"
37
38struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
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 */
71STATIC xfs_dahash_t
72xfs_ascii_ci_hashname(
73 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 = tolower(name->name[i]) ^ rol32(hash, 7);
80
81 return hash;
82}
83
84STATIC enum 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 (tolower(args->name[i]) != tolower(name[i]))
101 return XFS_CMP_DIFFERENT;
102 result = XFS_CMP_CASE;
103 }
104
105 return result;
106}
107
108static const struct xfs_nameops xfs_ascii_ci_nameops = {
109 .hashname = xfs_ascii_ci_hashname,
110 .compname = xfs_ascii_ci_compname,
111};
112
113int
114xfs_da_mount(
115 struct xfs_mount *mp)
116{
117 struct xfs_da_geometry *dageo;
118 int nodehdr_size;
119
120
121 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
122 ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
123
124 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
125 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
126
127 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
128 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
129 KM_SLEEP | KM_MAYFAIL);
130 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry),
131 KM_SLEEP | KM_MAYFAIL);
132 if (!mp->m_dir_geo || !mp->m_attr_geo) {
133 kmem_free(mp->m_dir_geo);
134 kmem_free(mp->m_attr_geo);
135 return -ENOMEM;
136 }
137
138 /* set up directory geometry */
139 dageo = mp->m_dir_geo;
140 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
141 dageo->fsblog = mp->m_sb.sb_blocklog;
142 dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb);
143 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
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 - nodehdr_size) /
153 (uint)sizeof(xfs_da_node_entry_t);
154 dageo->magicpct = (dageo->blksize * 37) / 100;
155
156 /* set up attribute geometry - single fsb only */
157 dageo = mp->m_attr_geo;
158 dageo->blklog = mp->m_sb.sb_blocklog;
159 dageo->fsblog = mp->m_sb.sb_blocklog;
160 dageo->blksize = 1 << dageo->blklog;
161 dageo->fsbcount = 1;
162 dageo->node_ents = (dageo->blksize - nodehdr_size) /
163 (uint)sizeof(xfs_da_node_entry_t);
164 dageo->magicpct = (dageo->blksize * 37) / 100;
165
166 if (xfs_sb_version_hasasciici(&mp->m_sb))
167 mp->m_dirnameops = &xfs_ascii_ci_nameops;
168 else
169 mp->m_dirnameops = &xfs_default_nameops;
170
171 return 0;
172}
173
174void
175xfs_da_unmount(
176 struct xfs_mount *mp)
177{
178 kmem_free(mp->m_dir_geo);
179 kmem_free(mp->m_attr_geo);
180}
181
182/*
183 * Return 1 if directory contains only "." and "..".
184 */
185int
186xfs_dir_isempty(
187 xfs_inode_t *dp)
188{
189 xfs_dir2_sf_hdr_t *sfp;
190
191 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
192 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
193 return 1;
194 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
195 return 0;
196 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
197 return !sfp->count;
198}
199
200/*
201 * Validate a given inode number.
202 */
203int
204xfs_dir_ino_validate(
205 xfs_mount_t *mp,
206 xfs_ino_t ino)
207{
208 bool ino_ok = xfs_verify_dir_ino(mp, ino);
209
210 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE))) {
211 xfs_warn(mp, "Invalid inode number 0x%Lx",
212 (unsigned long long) ino);
213 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
214 return -EFSCORRUPTED;
215 }
216 return 0;
217}
218
219/*
220 * Initialize a directory with its "." and ".." entries.
221 */
222int
223xfs_dir_init(
224 xfs_trans_t *tp,
225 xfs_inode_t *dp,
226 xfs_inode_t *pdp)
227{
228 struct xfs_da_args *args;
229 int error;
230
231 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
232 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
233 if (error)
234 return error;
235
236 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
237 if (!args)
238 return -ENOMEM;
239
240 args->geo = dp->i_mount->m_dir_geo;
241 args->dp = dp;
242 args->trans = tp;
243 error = xfs_dir2_sf_create(args, pdp->i_ino);
244 kmem_free(args);
245 return error;
246}
247
248/*
249 * Enter a name in a directory, or check for available space.
250 * If inum is 0, only the available space test is performed.
251 */
252int
253xfs_dir_createname(
254 xfs_trans_t *tp,
255 xfs_inode_t *dp,
256 struct xfs_name *name,
257 xfs_ino_t inum, /* new entry inode number */
258 xfs_fsblock_t *first, /* bmap's firstblock */
259 struct xfs_defer_ops *dfops, /* bmap's freeblock list */
260 xfs_extlen_t total) /* bmap's total block count */
261{
262 struct xfs_da_args *args;
263 int rval;
264 int v; /* type-checking value */
265
266 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
267 if (inum) {
268 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
269 if (rval)
270 return rval;
271 XFS_STATS_INC(dp->i_mount, xs_dir_create);
272 }
273
274 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
275 if (!args)
276 return -ENOMEM;
277
278 args->geo = dp->i_mount->m_dir_geo;
279 args->name = name->name;
280 args->namelen = name->len;
281 args->filetype = name->type;
282 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
283 args->inumber = inum;
284 args->dp = dp;
285 args->firstblock = first;
286 args->dfops = dfops;
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_d.di_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 xfs_trans_t *tp,
354 xfs_inode_t *dp,
355 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 int v; /* type-checking value */
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_SLEEP | 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 = dp->i_mount->m_dirnameops->hashname(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_d.di_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 xfs_trans_t *tp,
432 xfs_inode_t *dp,
433 struct xfs_name *name,
434 xfs_ino_t ino,
435 xfs_fsblock_t *first, /* bmap's firstblock */
436 struct xfs_defer_ops *dfops, /* bmap's freeblock list */
437 xfs_extlen_t total) /* bmap's total block count */
438{
439 struct xfs_da_args *args;
440 int rval;
441 int v; /* type-checking value */
442
443 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
444 XFS_STATS_INC(dp->i_mount, xs_dir_remove);
445
446 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
447 if (!args)
448 return -ENOMEM;
449
450 args->geo = dp->i_mount->m_dir_geo;
451 args->name = name->name;
452 args->namelen = name->len;
453 args->filetype = name->type;
454 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
455 args->inumber = ino;
456 args->dp = dp;
457 args->firstblock = first;
458 args->dfops = dfops;
459 args->total = total;
460 args->whichfork = XFS_DATA_FORK;
461 args->trans = tp;
462
463 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
464 rval = xfs_dir2_sf_removename(args);
465 goto out_free;
466 }
467
468 rval = xfs_dir2_isblock(args, &v);
469 if (rval)
470 goto out_free;
471 if (v) {
472 rval = xfs_dir2_block_removename(args);
473 goto out_free;
474 }
475
476 rval = xfs_dir2_isleaf(args, &v);
477 if (rval)
478 goto out_free;
479 if (v)
480 rval = xfs_dir2_leaf_removename(args);
481 else
482 rval = xfs_dir2_node_removename(args);
483out_free:
484 kmem_free(args);
485 return rval;
486}
487
488/*
489 * Replace the inode number of a directory entry.
490 */
491int
492xfs_dir_replace(
493 xfs_trans_t *tp,
494 xfs_inode_t *dp,
495 struct xfs_name *name, /* name of entry to replace */
496 xfs_ino_t inum, /* new inode number */
497 xfs_fsblock_t *first, /* bmap's firstblock */
498 struct xfs_defer_ops *dfops, /* bmap's freeblock list */
499 xfs_extlen_t total) /* bmap's total block count */
500{
501 struct xfs_da_args *args;
502 int rval;
503 int v; /* type-checking value */
504
505 ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
506
507 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
508 if (rval)
509 return rval;
510
511 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
512 if (!args)
513 return -ENOMEM;
514
515 args->geo = dp->i_mount->m_dir_geo;
516 args->name = name->name;
517 args->namelen = name->len;
518 args->filetype = name->type;
519 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
520 args->inumber = inum;
521 args->dp = dp;
522 args->firstblock = first;
523 args->dfops = dfops;
524 args->total = total;
525 args->whichfork = XFS_DATA_FORK;
526 args->trans = tp;
527
528 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
529 rval = xfs_dir2_sf_replace(args);
530 goto out_free;
531 }
532
533 rval = xfs_dir2_isblock(args, &v);
534 if (rval)
535 goto out_free;
536 if (v) {
537 rval = xfs_dir2_block_replace(args);
538 goto out_free;
539 }
540
541 rval = xfs_dir2_isleaf(args, &v);
542 if (rval)
543 goto out_free;
544 if (v)
545 rval = xfs_dir2_leaf_replace(args);
546 else
547 rval = xfs_dir2_node_replace(args);
548out_free:
549 kmem_free(args);
550 return rval;
551}
552
553/*
554 * See if this entry can be added to the directory without allocating space.
555 */
556int
557xfs_dir_canenter(
558 xfs_trans_t *tp,
559 xfs_inode_t *dp,
560 struct xfs_name *name) /* name of entry to add */
561{
562 return xfs_dir_createname(tp, dp, name, 0, NULL, NULL, 0);
563}
564
565/*
566 * Utility routines.
567 */
568
569/*
570 * Add a block to the directory.
571 *
572 * This routine is for data and free blocks, not leaf/node blocks which are
573 * handled by xfs_da_grow_inode.
574 */
575int
576xfs_dir2_grow_inode(
577 struct xfs_da_args *args,
578 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
579 xfs_dir2_db_t *dbp) /* out: block number added */
580{
581 struct xfs_inode *dp = args->dp;
582 struct xfs_mount *mp = dp->i_mount;
583 xfs_fileoff_t bno; /* directory offset of new block */
584 int count; /* count of filesystem blocks */
585 int error;
586
587 trace_xfs_dir2_grow_inode(args, space);
588
589 /*
590 * Set lowest possible block in the space requested.
591 */
592 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
593 count = args->geo->fsbcount;
594
595 error = xfs_da_grow_inode_int(args, &bno, count);
596 if (error)
597 return error;
598
599 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
600
601 /*
602 * Update file's size if this is the data space and it grew.
603 */
604 if (space == XFS_DIR2_DATA_SPACE) {
605 xfs_fsize_t size; /* directory file (data) size */
606
607 size = XFS_FSB_TO_B(mp, bno + count);
608 if (size > dp->i_d.di_size) {
609 dp->i_d.di_size = size;
610 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
611 }
612 }
613 return 0;
614}
615
616/*
617 * See if the directory is a single-block form directory.
618 */
619int
620xfs_dir2_isblock(
621 struct xfs_da_args *args,
622 int *vp) /* out: 1 is block, 0 is not block */
623{
624 xfs_fileoff_t last; /* last file offset */
625 int rval;
626
627 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
628 return rval;
629 rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize;
630 if (rval != 0 && args->dp->i_d.di_size != args->geo->blksize)
631 return -EFSCORRUPTED;
632 *vp = rval;
633 return 0;
634}
635
636/*
637 * See if the directory is a single-leaf form directory.
638 */
639int
640xfs_dir2_isleaf(
641 struct xfs_da_args *args,
642 int *vp) /* out: 1 is block, 0 is not block */
643{
644 xfs_fileoff_t last; /* last file offset */
645 int rval;
646
647 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK)))
648 return rval;
649 *vp = last == args->geo->leafblk + args->geo->fsbcount;
650 return 0;
651}
652
653/*
654 * Remove the given block from the directory.
655 * This routine is used for data and free blocks, leaf/node are done
656 * by xfs_da_shrink_inode.
657 */
658int
659xfs_dir2_shrink_inode(
660 xfs_da_args_t *args,
661 xfs_dir2_db_t db,
662 struct xfs_buf *bp)
663{
664 xfs_fileoff_t bno; /* directory file offset */
665 xfs_dablk_t da; /* directory file offset */
666 int done; /* bunmap is finished */
667 xfs_inode_t *dp;
668 int error;
669 xfs_mount_t *mp;
670 xfs_trans_t *tp;
671
672 trace_xfs_dir2_shrink_inode(args, db);
673
674 dp = args->dp;
675 mp = dp->i_mount;
676 tp = args->trans;
677 da = xfs_dir2_db_to_da(args->geo, db);
678
679 /* Unmap the fsblock(s). */
680 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0,
681 args->firstblock, args->dfops, &done);
682 if (error) {
683 /*
684 * ENOSPC actually can happen if we're in a removename with no
685 * space reservation, and the resulting block removal would
686 * cause a bmap btree split or conversion from extents to btree.
687 * This can only happen for un-fragmented directory blocks,
688 * since you need to be punching out the middle of an extent.
689 * In this case we need to leave the block in the file, and not
690 * binval it. So the block has to be in a consistent empty
691 * state and appropriately logged. We don't free up the buffer,
692 * the caller can tell it hasn't happened since it got an error
693 * back.
694 */
695 return error;
696 }
697 ASSERT(done);
698 /*
699 * Invalidate the buffer from the transaction.
700 */
701 xfs_trans_binval(tp, bp);
702 /*
703 * If it's not a data block, we're done.
704 */
705 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
706 return 0;
707 /*
708 * If the block isn't the last one in the directory, we're done.
709 */
710 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
711 return 0;
712 bno = da;
713 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
714 /*
715 * This can't really happen unless there's kernel corruption.
716 */
717 return error;
718 }
719 if (db == args->geo->datablk)
720 ASSERT(bno == 0);
721 else
722 ASSERT(bno > 0);
723 /*
724 * Set the size to the new last block.
725 */
726 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
727 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
728 return 0;
729}
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}