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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_inum.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_mount.h"
27#include "xfs_da_format.h"
28#include "xfs_da_btree.h"
29#include "xfs_inode.h"
30#include "xfs_trans.h"
31#include "xfs_inode_item.h"
32#include "xfs_bmap.h"
33#include "xfs_dir2.h"
34#include "xfs_dir2_priv.h"
35#include "xfs_error.h"
36#include "xfs_trace.h"
37#include "xfs_dinode.h"
38
39struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
40
41
42/*
43 * ASCII case-insensitive (ie. A-Z) support for directories that was
44 * used in IRIX.
45 */
46STATIC xfs_dahash_t
47xfs_ascii_ci_hashname(
48 struct xfs_name *name)
49{
50 xfs_dahash_t hash;
51 int i;
52
53 for (i = 0, hash = 0; i < name->len; i++)
54 hash = tolower(name->name[i]) ^ rol32(hash, 7);
55
56 return hash;
57}
58
59STATIC enum xfs_dacmp
60xfs_ascii_ci_compname(
61 struct xfs_da_args *args,
62 const unsigned char *name,
63 int len)
64{
65 enum xfs_dacmp result;
66 int i;
67
68 if (args->namelen != len)
69 return XFS_CMP_DIFFERENT;
70
71 result = XFS_CMP_EXACT;
72 for (i = 0; i < len; i++) {
73 if (args->name[i] == name[i])
74 continue;
75 if (tolower(args->name[i]) != tolower(name[i]))
76 return XFS_CMP_DIFFERENT;
77 result = XFS_CMP_CASE;
78 }
79
80 return result;
81}
82
83static struct xfs_nameops xfs_ascii_ci_nameops = {
84 .hashname = xfs_ascii_ci_hashname,
85 .compname = xfs_ascii_ci_compname,
86};
87
88void
89xfs_dir_mount(
90 xfs_mount_t *mp)
91{
92 int nodehdr_size;
93
94
95 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
96 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
97 XFS_MAX_BLOCKSIZE);
98
99 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL);
100 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL);
101
102 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
103 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
104 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
105 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
106 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
107
108 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size;
109 mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) /
110 (uint)sizeof(xfs_da_node_entry_t);
111 mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) /
112 (uint)sizeof(xfs_da_node_entry_t);
113
114 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
115 if (xfs_sb_version_hasasciici(&mp->m_sb))
116 mp->m_dirnameops = &xfs_ascii_ci_nameops;
117 else
118 mp->m_dirnameops = &xfs_default_nameops;
119
120}
121
122/*
123 * Return 1 if directory contains only "." and "..".
124 */
125int
126xfs_dir_isempty(
127 xfs_inode_t *dp)
128{
129 xfs_dir2_sf_hdr_t *sfp;
130
131 ASSERT(S_ISDIR(dp->i_d.di_mode));
132 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
133 return 1;
134 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
135 return 0;
136 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
137 return !sfp->count;
138}
139
140/*
141 * Validate a given inode number.
142 */
143int
144xfs_dir_ino_validate(
145 xfs_mount_t *mp,
146 xfs_ino_t ino)
147{
148 xfs_agblock_t agblkno;
149 xfs_agino_t agino;
150 xfs_agnumber_t agno;
151 int ino_ok;
152 int ioff;
153
154 agno = XFS_INO_TO_AGNO(mp, ino);
155 agblkno = XFS_INO_TO_AGBNO(mp, ino);
156 ioff = XFS_INO_TO_OFFSET(mp, ino);
157 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
158 ino_ok =
159 agno < mp->m_sb.sb_agcount &&
160 agblkno < mp->m_sb.sb_agblocks &&
161 agblkno != 0 &&
162 ioff < (1 << mp->m_sb.sb_inopblog) &&
163 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
164 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
165 XFS_RANDOM_DIR_INO_VALIDATE))) {
166 xfs_warn(mp, "Invalid inode number 0x%Lx",
167 (unsigned long long) ino);
168 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
169 return XFS_ERROR(EFSCORRUPTED);
170 }
171 return 0;
172}
173
174/*
175 * Initialize a directory with its "." and ".." entries.
176 */
177int
178xfs_dir_init(
179 xfs_trans_t *tp,
180 xfs_inode_t *dp,
181 xfs_inode_t *pdp)
182{
183 struct xfs_da_args *args;
184 int error;
185
186 ASSERT(S_ISDIR(dp->i_d.di_mode));
187 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
188 if (error)
189 return error;
190
191 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
192 if (!args)
193 return ENOMEM;
194
195 args->dp = dp;
196 args->trans = tp;
197 error = xfs_dir2_sf_create(args, pdp->i_ino);
198 kmem_free(args);
199 return error;
200}
201
202/*
203 Enter a name in a directory.
204 */
205int
206xfs_dir_createname(
207 xfs_trans_t *tp,
208 xfs_inode_t *dp,
209 struct xfs_name *name,
210 xfs_ino_t inum, /* new entry inode number */
211 xfs_fsblock_t *first, /* bmap's firstblock */
212 xfs_bmap_free_t *flist, /* bmap's freeblock list */
213 xfs_extlen_t total) /* bmap's total block count */
214{
215 struct xfs_da_args *args;
216 int rval;
217 int v; /* type-checking value */
218
219 ASSERT(S_ISDIR(dp->i_d.di_mode));
220 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
221 if (rval)
222 return rval;
223 XFS_STATS_INC(xs_dir_create);
224
225 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
226 if (!args)
227 return ENOMEM;
228
229 args->name = name->name;
230 args->namelen = name->len;
231 args->filetype = name->type;
232 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
233 args->inumber = inum;
234 args->dp = dp;
235 args->firstblock = first;
236 args->flist = flist;
237 args->total = total;
238 args->whichfork = XFS_DATA_FORK;
239 args->trans = tp;
240 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
241
242 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
243 rval = xfs_dir2_sf_addname(args);
244 goto out_free;
245 }
246
247 rval = xfs_dir2_isblock(tp, dp, &v);
248 if (rval)
249 goto out_free;
250 if (v) {
251 rval = xfs_dir2_block_addname(args);
252 goto out_free;
253 }
254
255 rval = xfs_dir2_isleaf(tp, dp, &v);
256 if (rval)
257 goto out_free;
258 if (v)
259 rval = xfs_dir2_leaf_addname(args);
260 else
261 rval = xfs_dir2_node_addname(args);
262
263out_free:
264 kmem_free(args);
265 return rval;
266}
267
268/*
269 * If doing a CI lookup and case-insensitive match, dup actual name into
270 * args.value. Return EEXIST for success (ie. name found) or an error.
271 */
272int
273xfs_dir_cilookup_result(
274 struct xfs_da_args *args,
275 const unsigned char *name,
276 int len)
277{
278 if (args->cmpresult == XFS_CMP_DIFFERENT)
279 return ENOENT;
280 if (args->cmpresult != XFS_CMP_CASE ||
281 !(args->op_flags & XFS_DA_OP_CILOOKUP))
282 return EEXIST;
283
284 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
285 if (!args->value)
286 return ENOMEM;
287
288 memcpy(args->value, name, len);
289 args->valuelen = len;
290 return EEXIST;
291}
292
293/*
294 * Lookup a name in a directory, give back the inode number.
295 * If ci_name is not NULL, returns the actual name in ci_name if it differs
296 * to name, or ci_name->name is set to NULL for an exact match.
297 */
298
299int
300xfs_dir_lookup(
301 xfs_trans_t *tp,
302 xfs_inode_t *dp,
303 struct xfs_name *name,
304 xfs_ino_t *inum, /* out: inode number */
305 struct xfs_name *ci_name) /* out: actual name if CI match */
306{
307 struct xfs_da_args *args;
308 int rval;
309 int v; /* type-checking value */
310
311 ASSERT(S_ISDIR(dp->i_d.di_mode));
312 XFS_STATS_INC(xs_dir_lookup);
313
314 /*
315 * We need to use KM_NOFS here so that lockdep will not throw false
316 * positive deadlock warnings on a non-transactional lookup path. It is
317 * safe to recurse into inode recalim in that case, but lockdep can't
318 * easily be taught about it. Hence KM_NOFS avoids having to add more
319 * lockdep Doing this avoids having to add a bunch of lockdep class
320 * annotations into the reclaim path for the ilock.
321 */
322 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
323 args->name = name->name;
324 args->namelen = name->len;
325 args->filetype = name->type;
326 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
327 args->dp = dp;
328 args->whichfork = XFS_DATA_FORK;
329 args->trans = tp;
330 args->op_flags = XFS_DA_OP_OKNOENT;
331 if (ci_name)
332 args->op_flags |= XFS_DA_OP_CILOOKUP;
333
334 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
335 rval = xfs_dir2_sf_lookup(args);
336 goto out_check_rval;
337 }
338
339 rval = xfs_dir2_isblock(tp, dp, &v);
340 if (rval)
341 goto out_free;
342 if (v) {
343 rval = xfs_dir2_block_lookup(args);
344 goto out_check_rval;
345 }
346
347 rval = xfs_dir2_isleaf(tp, dp, &v);
348 if (rval)
349 goto out_free;
350 if (v)
351 rval = xfs_dir2_leaf_lookup(args);
352 else
353 rval = xfs_dir2_node_lookup(args);
354
355out_check_rval:
356 if (rval == EEXIST)
357 rval = 0;
358 if (!rval) {
359 *inum = args->inumber;
360 if (ci_name) {
361 ci_name->name = args->value;
362 ci_name->len = args->valuelen;
363 }
364 }
365out_free:
366 kmem_free(args);
367 return rval;
368}
369
370/*
371 * Remove an entry from a directory.
372 */
373int
374xfs_dir_removename(
375 xfs_trans_t *tp,
376 xfs_inode_t *dp,
377 struct xfs_name *name,
378 xfs_ino_t ino,
379 xfs_fsblock_t *first, /* bmap's firstblock */
380 xfs_bmap_free_t *flist, /* bmap's freeblock list */
381 xfs_extlen_t total) /* bmap's total block count */
382{
383 struct xfs_da_args *args;
384 int rval;
385 int v; /* type-checking value */
386
387 ASSERT(S_ISDIR(dp->i_d.di_mode));
388 XFS_STATS_INC(xs_dir_remove);
389
390 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
391 if (!args)
392 return ENOMEM;
393
394 args->name = name->name;
395 args->namelen = name->len;
396 args->filetype = name->type;
397 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
398 args->inumber = ino;
399 args->dp = dp;
400 args->firstblock = first;
401 args->flist = flist;
402 args->total = total;
403 args->whichfork = XFS_DATA_FORK;
404 args->trans = tp;
405
406 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
407 rval = xfs_dir2_sf_removename(args);
408 goto out_free;
409 }
410
411 rval = xfs_dir2_isblock(tp, dp, &v);
412 if (rval)
413 goto out_free;
414 if (v) {
415 rval = xfs_dir2_block_removename(args);
416 goto out_free;
417 }
418
419 rval = xfs_dir2_isleaf(tp, dp, &v);
420 if (rval)
421 goto out_free;
422 if (v)
423 rval = xfs_dir2_leaf_removename(args);
424 else
425 rval = xfs_dir2_node_removename(args);
426out_free:
427 kmem_free(args);
428 return rval;
429}
430
431/*
432 * Replace the inode number of a directory entry.
433 */
434int
435xfs_dir_replace(
436 xfs_trans_t *tp,
437 xfs_inode_t *dp,
438 struct xfs_name *name, /* name of entry to replace */
439 xfs_ino_t inum, /* new inode number */
440 xfs_fsblock_t *first, /* bmap's firstblock */
441 xfs_bmap_free_t *flist, /* bmap's freeblock list */
442 xfs_extlen_t total) /* bmap's total block count */
443{
444 struct xfs_da_args *args;
445 int rval;
446 int v; /* type-checking value */
447
448 ASSERT(S_ISDIR(dp->i_d.di_mode));
449
450 rval = xfs_dir_ino_validate(tp->t_mountp, inum);
451 if (rval)
452 return rval;
453
454 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
455 if (!args)
456 return ENOMEM;
457
458 args->name = name->name;
459 args->namelen = name->len;
460 args->filetype = name->type;
461 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
462 args->inumber = inum;
463 args->dp = dp;
464 args->firstblock = first;
465 args->flist = flist;
466 args->total = total;
467 args->whichfork = XFS_DATA_FORK;
468 args->trans = tp;
469
470 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
471 rval = xfs_dir2_sf_replace(args);
472 goto out_free;
473 }
474
475 rval = xfs_dir2_isblock(tp, dp, &v);
476 if (rval)
477 goto out_free;
478 if (v) {
479 rval = xfs_dir2_block_replace(args);
480 goto out_free;
481 }
482
483 rval = xfs_dir2_isleaf(tp, dp, &v);
484 if (rval)
485 goto out_free;
486 if (v)
487 rval = xfs_dir2_leaf_replace(args);
488 else
489 rval = xfs_dir2_node_replace(args);
490out_free:
491 kmem_free(args);
492 return rval;
493}
494
495/*
496 * See if this entry can be added to the directory without allocating space.
497 * First checks that the caller couldn't reserve enough space (resblks = 0).
498 */
499int
500xfs_dir_canenter(
501 xfs_trans_t *tp,
502 xfs_inode_t *dp,
503 struct xfs_name *name, /* name of entry to add */
504 uint resblks)
505{
506 struct xfs_da_args *args;
507 int rval;
508 int v; /* type-checking value */
509
510 if (resblks)
511 return 0;
512
513 ASSERT(S_ISDIR(dp->i_d.di_mode));
514
515 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS);
516 if (!args)
517 return ENOMEM;
518
519 args->name = name->name;
520 args->namelen = name->len;
521 args->filetype = name->type;
522 args->hashval = dp->i_mount->m_dirnameops->hashname(name);
523 args->dp = dp;
524 args->whichfork = XFS_DATA_FORK;
525 args->trans = tp;
526 args->op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
527 XFS_DA_OP_OKNOENT;
528
529 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
530 rval = xfs_dir2_sf_addname(args);
531 goto out_free;
532 }
533
534 rval = xfs_dir2_isblock(tp, dp, &v);
535 if (rval)
536 goto out_free;
537 if (v) {
538 rval = xfs_dir2_block_addname(args);
539 goto out_free;
540 }
541
542 rval = xfs_dir2_isleaf(tp, dp, &v);
543 if (rval)
544 goto out_free;
545 if (v)
546 rval = xfs_dir2_leaf_addname(args);
547 else
548 rval = xfs_dir2_node_addname(args);
549out_free:
550 kmem_free(args);
551 return rval;
552}
553
554/*
555 * Utility routines.
556 */
557
558/*
559 * Add a block to the directory.
560 *
561 * This routine is for data and free blocks, not leaf/node blocks which are
562 * handled by xfs_da_grow_inode.
563 */
564int
565xfs_dir2_grow_inode(
566 struct xfs_da_args *args,
567 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
568 xfs_dir2_db_t *dbp) /* out: block number added */
569{
570 struct xfs_inode *dp = args->dp;
571 struct xfs_mount *mp = dp->i_mount;
572 xfs_fileoff_t bno; /* directory offset of new block */
573 int count; /* count of filesystem blocks */
574 int error;
575
576 trace_xfs_dir2_grow_inode(args, space);
577
578 /*
579 * Set lowest possible block in the space requested.
580 */
581 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
582 count = mp->m_dirblkfsbs;
583
584 error = xfs_da_grow_inode_int(args, &bno, count);
585 if (error)
586 return error;
587
588 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
589
590 /*
591 * Update file's size if this is the data space and it grew.
592 */
593 if (space == XFS_DIR2_DATA_SPACE) {
594 xfs_fsize_t size; /* directory file (data) size */
595
596 size = XFS_FSB_TO_B(mp, bno + count);
597 if (size > dp->i_d.di_size) {
598 dp->i_d.di_size = size;
599 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
600 }
601 }
602 return 0;
603}
604
605/*
606 * See if the directory is a single-block form directory.
607 */
608int
609xfs_dir2_isblock(
610 xfs_trans_t *tp,
611 xfs_inode_t *dp,
612 int *vp) /* out: 1 is block, 0 is not block */
613{
614 xfs_fileoff_t last; /* last file offset */
615 xfs_mount_t *mp;
616 int rval;
617
618 mp = dp->i_mount;
619 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
620 return rval;
621 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
622 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
623 *vp = rval;
624 return 0;
625}
626
627/*
628 * See if the directory is a single-leaf form directory.
629 */
630int
631xfs_dir2_isleaf(
632 xfs_trans_t *tp,
633 xfs_inode_t *dp,
634 int *vp) /* out: 1 is leaf, 0 is not leaf */
635{
636 xfs_fileoff_t last; /* last file offset */
637 xfs_mount_t *mp;
638 int rval;
639
640 mp = dp->i_mount;
641 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
642 return rval;
643 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
644 return 0;
645}
646
647/*
648 * Remove the given block from the directory.
649 * This routine is used for data and free blocks, leaf/node are done
650 * by xfs_da_shrink_inode.
651 */
652int
653xfs_dir2_shrink_inode(
654 xfs_da_args_t *args,
655 xfs_dir2_db_t db,
656 struct xfs_buf *bp)
657{
658 xfs_fileoff_t bno; /* directory file offset */
659 xfs_dablk_t da; /* directory file offset */
660 int done; /* bunmap is finished */
661 xfs_inode_t *dp;
662 int error;
663 xfs_mount_t *mp;
664 xfs_trans_t *tp;
665
666 trace_xfs_dir2_shrink_inode(args, db);
667
668 dp = args->dp;
669 mp = dp->i_mount;
670 tp = args->trans;
671 da = xfs_dir2_db_to_da(mp, db);
672 /*
673 * Unmap the fsblock(s).
674 */
675 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
676 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
677 &done))) {
678 /*
679 * ENOSPC actually can happen if we're in a removename with
680 * no space reservation, and the resulting block removal
681 * would cause a bmap btree split or conversion from extents
682 * to btree. This can only happen for un-fragmented
683 * directory blocks, since you need to be punching out
684 * the middle of an extent.
685 * In this case we need to leave the block in the file,
686 * and not binval it.
687 * So the block has to be in a consistent empty state
688 * and appropriately logged.
689 * We don't free up the buffer, the caller can tell it
690 * hasn't happened since it got an error back.
691 */
692 return error;
693 }
694 ASSERT(done);
695 /*
696 * Invalidate the buffer from the transaction.
697 */
698 xfs_trans_binval(tp, bp);
699 /*
700 * If it's not a data block, we're done.
701 */
702 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
703 return 0;
704 /*
705 * If the block isn't the last one in the directory, we're done.
706 */
707 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
708 return 0;
709 bno = da;
710 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
711 /*
712 * This can't really happen unless there's kernel corruption.
713 */
714 return error;
715 }
716 if (db == mp->m_dirdatablk)
717 ASSERT(bno == 0);
718 else
719 ASSERT(bno > 0);
720 /*
721 * Set the size to the new last block.
722 */
723 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
724 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
725 return 0;
726}