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18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_types.h"
21#include "xfs_bit.h"
22#include "xfs_log.h"
23#include "xfs_inum.h"
24#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_dir2.h"
28#include "xfs_dmapi.h"
29#include "xfs_mount.h"
30#include "xfs_da_btree.h"
31#include "xfs_bmap_btree.h"
32#include "xfs_alloc_btree.h"
33#include "xfs_dir2_sf.h"
34#include "xfs_attr_sf.h"
35#include "xfs_dinode.h"
36#include "xfs_inode.h"
37#include "xfs_inode_item.h"
38#include "xfs_bmap.h"
39#include "xfs_dir2_data.h"
40#include "xfs_dir2_leaf.h"
41#include "xfs_dir2_block.h"
42#include "xfs_dir2_node.h"
43#include "xfs_dir2_trace.h"
44#include "xfs_error.h"
45#include "xfs_vnodeops.h"
46
47struct xfs_name xfs_name_dotdot = {"..", 2};
48
49extern const struct xfs_nameops xfs_default_nameops;
50
51
52
53
54
55STATIC xfs_dahash_t
56xfs_ascii_ci_hashname(
57 struct xfs_name *name)
58{
59 xfs_dahash_t hash;
60 int i;
61
62 for (i = 0, hash = 0; i < name->len; i++)
63 hash = tolower(name->name[i]) ^ rol32(hash, 7);
64
65 return hash;
66}
67
68STATIC enum xfs_dacmp
69xfs_ascii_ci_compname(
70 struct xfs_da_args *args,
71 const char *name,
72 int len)
73{
74 enum xfs_dacmp result;
75 int i;
76
77 if (args->namelen != len)
78 return XFS_CMP_DIFFERENT;
79
80 result = XFS_CMP_EXACT;
81 for (i = 0; i < len; i++) {
82 if (args->name[i] == name[i])
83 continue;
84 if (tolower(args->name[i]) != tolower(name[i]))
85 return XFS_CMP_DIFFERENT;
86 result = XFS_CMP_CASE;
87 }
88
89 return result;
90}
91
92static struct xfs_nameops xfs_ascii_ci_nameops = {
93 .hashname = xfs_ascii_ci_hashname,
94 .compname = xfs_ascii_ci_compname,
95};
96
97void
98xfs_dir_mount(
99 xfs_mount_t *mp)
100{
101 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
102 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
103 XFS_MAX_BLOCKSIZE);
104 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
105 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
106 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
107 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
108 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
109 mp->m_attr_node_ents =
110 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
111 (uint)sizeof(xfs_da_node_entry_t);
112 mp->m_dir_node_ents =
113 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
114 (uint)sizeof(xfs_da_node_entry_t);
115 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
116 if (xfs_sb_version_hasasciici(&mp->m_sb))
117 mp->m_dirnameops = &xfs_ascii_ci_nameops;
118 else
119 mp->m_dirnameops = &xfs_default_nameops;
120}
121
122
123
124
125int
126xfs_dir_isempty(
127 xfs_inode_t *dp)
128{
129 xfs_dir2_sf_t *sfp;
130
131 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
132 if (dp->i_d.di_size == 0)
133 return 1;
134 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
135 return 0;
136 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
137 return !sfp->hdr.count;
138}
139
140
141
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_fs_cmn_err(CE_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
176
177int
178xfs_dir_init(
179 xfs_trans_t *tp,
180 xfs_inode_t *dp,
181 xfs_inode_t *pdp)
182{
183 xfs_da_args_t args;
184 int error;
185
186 memset((char *)&args, 0, sizeof(args));
187 args.dp = dp;
188 args.trans = tp;
189 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
190 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
191 return error;
192 return xfs_dir2_sf_create(&args, pdp->i_ino);
193}
194
195
196
197
198int
199xfs_dir_createname(
200 xfs_trans_t *tp,
201 xfs_inode_t *dp,
202 struct xfs_name *name,
203 xfs_ino_t inum,
204 xfs_fsblock_t *first,
205 xfs_bmap_free_t *flist,
206 xfs_extlen_t total)
207{
208 xfs_da_args_t args;
209 int rval;
210 int v;
211
212 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
213 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
214 return rval;
215 XFS_STATS_INC(xs_dir_create);
216
217 memset(&args, 0, sizeof(xfs_da_args_t));
218 args.name = name->name;
219 args.namelen = name->len;
220 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
221 args.inumber = inum;
222 args.dp = dp;
223 args.firstblock = first;
224 args.flist = flist;
225 args.total = total;
226 args.whichfork = XFS_DATA_FORK;
227 args.trans = tp;
228 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
229
230 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
231 rval = xfs_dir2_sf_addname(&args);
232 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
233 return rval;
234 else if (v)
235 rval = xfs_dir2_block_addname(&args);
236 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
237 return rval;
238 else if (v)
239 rval = xfs_dir2_leaf_addname(&args);
240 else
241 rval = xfs_dir2_node_addname(&args);
242 return rval;
243}
244
245
246
247
248
249int
250xfs_dir_cilookup_result(
251 struct xfs_da_args *args,
252 const char *name,
253 int len)
254{
255 if (args->cmpresult == XFS_CMP_DIFFERENT)
256 return ENOENT;
257 if (args->cmpresult != XFS_CMP_CASE ||
258 !(args->op_flags & XFS_DA_OP_CILOOKUP))
259 return EEXIST;
260
261 args->value = kmem_alloc(len, KM_MAYFAIL);
262 if (!args->value)
263 return ENOMEM;
264
265 memcpy(args->value, name, len);
266 args->valuelen = len;
267 return EEXIST;
268}
269
270
271
272
273
274
275
276int
277xfs_dir_lookup(
278 xfs_trans_t *tp,
279 xfs_inode_t *dp,
280 struct xfs_name *name,
281 xfs_ino_t *inum,
282 struct xfs_name *ci_name)
283{
284 xfs_da_args_t args;
285 int rval;
286 int v;
287
288 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
289 XFS_STATS_INC(xs_dir_lookup);
290
291 memset(&args, 0, sizeof(xfs_da_args_t));
292 args.name = name->name;
293 args.namelen = name->len;
294 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
295 args.dp = dp;
296 args.whichfork = XFS_DATA_FORK;
297 args.trans = tp;
298 args.op_flags = XFS_DA_OP_OKNOENT;
299 if (ci_name)
300 args.op_flags |= XFS_DA_OP_CILOOKUP;
301
302 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
303 rval = xfs_dir2_sf_lookup(&args);
304 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
305 return rval;
306 else if (v)
307 rval = xfs_dir2_block_lookup(&args);
308 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
309 return rval;
310 else if (v)
311 rval = xfs_dir2_leaf_lookup(&args);
312 else
313 rval = xfs_dir2_node_lookup(&args);
314 if (rval == EEXIST)
315 rval = 0;
316 if (!rval) {
317 *inum = args.inumber;
318 if (ci_name) {
319 ci_name->name = args.value;
320 ci_name->len = args.valuelen;
321 }
322 }
323 return rval;
324}
325
326
327
328
329int
330xfs_dir_removename(
331 xfs_trans_t *tp,
332 xfs_inode_t *dp,
333 struct xfs_name *name,
334 xfs_ino_t ino,
335 xfs_fsblock_t *first,
336 xfs_bmap_free_t *flist,
337 xfs_extlen_t total)
338{
339 xfs_da_args_t args;
340 int rval;
341 int v;
342
343 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
344 XFS_STATS_INC(xs_dir_remove);
345
346 memset(&args, 0, sizeof(xfs_da_args_t));
347 args.name = name->name;
348 args.namelen = name->len;
349 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
350 args.inumber = ino;
351 args.dp = dp;
352 args.firstblock = first;
353 args.flist = flist;
354 args.total = total;
355 args.whichfork = XFS_DATA_FORK;
356 args.trans = tp;
357
358 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
359 rval = xfs_dir2_sf_removename(&args);
360 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
361 return rval;
362 else if (v)
363 rval = xfs_dir2_block_removename(&args);
364 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
365 return rval;
366 else if (v)
367 rval = xfs_dir2_leaf_removename(&args);
368 else
369 rval = xfs_dir2_node_removename(&args);
370 return rval;
371}
372
373
374
375
376int
377xfs_readdir(
378 xfs_inode_t *dp,
379 void *dirent,
380 size_t bufsize,
381 xfs_off_t *offset,
382 filldir_t filldir)
383{
384 int rval;
385 int v;
386
387 xfs_itrace_entry(dp);
388
389 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
390 return XFS_ERROR(EIO);
391
392 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
393 XFS_STATS_INC(xs_dir_getdents);
394
395 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
396 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
397 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
398 ;
399 else if (v)
400 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
401 else
402 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
403 filldir);
404 return rval;
405}
406
407
408
409
410int
411xfs_dir_replace(
412 xfs_trans_t *tp,
413 xfs_inode_t *dp,
414 struct xfs_name *name,
415 xfs_ino_t inum,
416 xfs_fsblock_t *first,
417 xfs_bmap_free_t *flist,
418 xfs_extlen_t total)
419{
420 xfs_da_args_t args;
421 int rval;
422 int v;
423
424 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
425
426 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
427 return rval;
428
429 memset(&args, 0, sizeof(xfs_da_args_t));
430 args.name = name->name;
431 args.namelen = name->len;
432 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
433 args.inumber = inum;
434 args.dp = dp;
435 args.firstblock = first;
436 args.flist = flist;
437 args.total = total;
438 args.whichfork = XFS_DATA_FORK;
439 args.trans = tp;
440
441 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
442 rval = xfs_dir2_sf_replace(&args);
443 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
444 return rval;
445 else if (v)
446 rval = xfs_dir2_block_replace(&args);
447 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
448 return rval;
449 else if (v)
450 rval = xfs_dir2_leaf_replace(&args);
451 else
452 rval = xfs_dir2_node_replace(&args);
453 return rval;
454}
455
456
457
458
459
460int
461xfs_dir_canenter(
462 xfs_trans_t *tp,
463 xfs_inode_t *dp,
464 struct xfs_name *name,
465 uint resblks)
466{
467 xfs_da_args_t args;
468 int rval;
469 int v;
470
471 if (resblks)
472 return 0;
473
474 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
475
476 memset(&args, 0, sizeof(xfs_da_args_t));
477 args.name = name->name;
478 args.namelen = name->len;
479 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
480 args.dp = dp;
481 args.whichfork = XFS_DATA_FORK;
482 args.trans = tp;
483 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
484 XFS_DA_OP_OKNOENT;
485
486 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
487 rval = xfs_dir2_sf_addname(&args);
488 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
489 return rval;
490 else if (v)
491 rval = xfs_dir2_block_addname(&args);
492 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
493 return rval;
494 else if (v)
495 rval = xfs_dir2_leaf_addname(&args);
496 else
497 rval = xfs_dir2_node_addname(&args);
498 return rval;
499}
500
501
502
503
504
505
506
507
508
509
510int
511xfs_dir2_grow_inode(
512 xfs_da_args_t *args,
513 int space,
514 xfs_dir2_db_t *dbp)
515{
516 xfs_fileoff_t bno;
517 int count;
518 xfs_inode_t *dp;
519 int error;
520 int got;
521 int i;
522 xfs_bmbt_irec_t map;
523 int mapi;
524 xfs_bmbt_irec_t *mapp;
525 xfs_mount_t *mp;
526 int nmap;
527 xfs_trans_t *tp;
528 xfs_drfsbno_t nblks;
529
530 xfs_dir2_trace_args_s("grow_inode", args, space);
531 dp = args->dp;
532 tp = args->trans;
533 mp = dp->i_mount;
534 nblks = dp->i_d.di_nblocks;
535
536
537
538 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
539 count = mp->m_dirblkfsbs;
540
541
542
543 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
544 return error;
545 nmap = 1;
546 ASSERT(args->firstblock != NULL);
547
548
549
550 if ((error = xfs_bmapi(tp, dp, bno, count,
551 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
552 args->firstblock, args->total, &map, &nmap,
553 args->flist, NULL)))
554 return error;
555 ASSERT(nmap <= 1);
556 if (nmap == 1) {
557 mapp = ↦
558 mapi = 1;
559 }
560
561
562
563
564 else if (nmap == 0 && count > 1) {
565 xfs_fileoff_t b;
566
567
568
569
570 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
571
572
573
574 for (b = bno, mapi = 0; b < bno + count; ) {
575 int c;
576
577
578
579
580 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
581 c = (int)(bno + count - b);
582 if ((error = xfs_bmapi(tp, dp, b, c,
583 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
584 args->firstblock, args->total,
585 &mapp[mapi], &nmap, args->flist,
586 NULL))) {
587 kmem_free(mapp);
588 return error;
589 }
590 if (nmap < 1)
591 break;
592
593
594
595 mapi += nmap;
596 b = mapp[mapi - 1].br_startoff +
597 mapp[mapi - 1].br_blockcount;
598 }
599 }
600
601
602
603 else {
604 mapi = 0;
605 mapp = NULL;
606 }
607
608
609
610 for (i = 0, got = 0; i < mapi; i++)
611 got += mapp[i].br_blockcount;
612
613
614
615 if (got != count || mapp[0].br_startoff != bno ||
616 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
617 bno + count) {
618 if (mapp != &map)
619 kmem_free(mapp);
620 return XFS_ERROR(ENOSPC);
621 }
622
623
624
625 if (mapp != &map)
626 kmem_free(mapp);
627
628
629 args->total -= dp->i_d.di_nblocks - nblks;
630 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
631
632
633
634
635 if (space == XFS_DIR2_DATA_SPACE) {
636 xfs_fsize_t size;
637
638 size = XFS_FSB_TO_B(mp, bno + count);
639 if (size > dp->i_d.di_size) {
640 dp->i_d.di_size = size;
641 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
642 }
643 }
644 return 0;
645}
646
647
648
649
650int
651xfs_dir2_isblock(
652 xfs_trans_t *tp,
653 xfs_inode_t *dp,
654 int *vp)
655{
656 xfs_fileoff_t last;
657 xfs_mount_t *mp;
658 int rval;
659
660 mp = dp->i_mount;
661 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
662 return rval;
663 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
664 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
665 *vp = rval;
666 return 0;
667}
668
669
670
671
672int
673xfs_dir2_isleaf(
674 xfs_trans_t *tp,
675 xfs_inode_t *dp,
676 int *vp)
677{
678 xfs_fileoff_t last;
679 xfs_mount_t *mp;
680 int rval;
681
682 mp = dp->i_mount;
683 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
684 return rval;
685 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
686 return 0;
687}
688
689
690
691
692
693
694int
695xfs_dir2_shrink_inode(
696 xfs_da_args_t *args,
697 xfs_dir2_db_t db,
698 xfs_dabuf_t *bp)
699{
700 xfs_fileoff_t bno;
701 xfs_dablk_t da;
702 int done;
703 xfs_inode_t *dp;
704 int error;
705 xfs_mount_t *mp;
706 xfs_trans_t *tp;
707
708 xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
709 dp = args->dp;
710 mp = dp->i_mount;
711 tp = args->trans;
712 da = xfs_dir2_db_to_da(mp, db);
713
714
715
716 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
717 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
718 NULL, &done))) {
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733 return error;
734 }
735 ASSERT(done);
736
737
738
739 xfs_da_binval(tp, bp);
740
741
742
743 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
744 return 0;
745
746
747
748 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
749 return 0;
750 bno = da;
751 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
752
753
754
755 return error;
756 }
757 if (db == mp->m_dirdatablk)
758 ASSERT(bno == 0);
759 else
760 ASSERT(bno > 0);
761
762
763
764 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
765 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
766 return 0;
767}