1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_types.h"
21#include "xfs_log.h"
22#include "xfs_inum.h"
23#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_mount.h"
27#include "xfs_da_btree.h"
28#include "xfs_bmap_btree.h"
29#include "xfs_alloc_btree.h"
30#include "xfs_dinode.h"
31#include "xfs_inode.h"
32#include "xfs_inode_item.h"
33#include "xfs_bmap.h"
34#include "xfs_dir2.h"
35#include "xfs_dir2_format.h"
36#include "xfs_dir2_priv.h"
37#include "xfs_error.h"
38#include "xfs_vnodeops.h"
39#include "xfs_trace.h"
40
41struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
42
43
44
45
46
47STATIC xfs_dahash_t
48xfs_ascii_ci_hashname(
49 struct xfs_name *name)
50{
51 xfs_dahash_t hash;
52 int i;
53
54 for (i = 0, hash = 0; i < name->len; i++)
55 hash = tolower(name->name[i]) ^ rol32(hash, 7);
56
57 return hash;
58}
59
60STATIC enum xfs_dacmp
61xfs_ascii_ci_compname(
62 struct xfs_da_args *args,
63 const unsigned char *name,
64 int len)
65{
66 enum xfs_dacmp result;
67 int i;
68
69 if (args->namelen != len)
70 return XFS_CMP_DIFFERENT;
71
72 result = XFS_CMP_EXACT;
73 for (i = 0; i < len; i++) {
74 if (args->name[i] == name[i])
75 continue;
76 if (tolower(args->name[i]) != tolower(name[i]))
77 return XFS_CMP_DIFFERENT;
78 result = XFS_CMP_CASE;
79 }
80
81 return result;
82}
83
84static struct xfs_nameops xfs_ascii_ci_nameops = {
85 .hashname = xfs_ascii_ci_hashname,
86 .compname = xfs_ascii_ci_compname,
87};
88
89void
90xfs_dir_mount(
91 xfs_mount_t *mp)
92{
93 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
94 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
95 XFS_MAX_BLOCKSIZE);
96 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
97 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
98 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
99 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
100 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
101 mp->m_attr_node_ents =
102 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
103 (uint)sizeof(xfs_da_node_entry_t);
104 mp->m_dir_node_ents =
105 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
106 (uint)sizeof(xfs_da_node_entry_t);
107 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
108 if (xfs_sb_version_hasasciici(&mp->m_sb))
109 mp->m_dirnameops = &xfs_ascii_ci_nameops;
110 else
111 mp->m_dirnameops = &xfs_default_nameops;
112}
113
114
115
116
117int
118xfs_dir_isempty(
119 xfs_inode_t *dp)
120{
121 xfs_dir2_sf_hdr_t *sfp;
122
123 ASSERT(S_ISDIR(dp->i_d.di_mode));
124 if (dp->i_d.di_size == 0)
125 return 1;
126 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
127 return 0;
128 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
129 return !sfp->count;
130}
131
132
133
134
135int
136xfs_dir_ino_validate(
137 xfs_mount_t *mp,
138 xfs_ino_t ino)
139{
140 xfs_agblock_t agblkno;
141 xfs_agino_t agino;
142 xfs_agnumber_t agno;
143 int ino_ok;
144 int ioff;
145
146 agno = XFS_INO_TO_AGNO(mp, ino);
147 agblkno = XFS_INO_TO_AGBNO(mp, ino);
148 ioff = XFS_INO_TO_OFFSET(mp, ino);
149 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
150 ino_ok =
151 agno < mp->m_sb.sb_agcount &&
152 agblkno < mp->m_sb.sb_agblocks &&
153 agblkno != 0 &&
154 ioff < (1 << mp->m_sb.sb_inopblog) &&
155 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
156 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
157 XFS_RANDOM_DIR_INO_VALIDATE))) {
158 xfs_warn(mp, "Invalid inode number 0x%Lx",
159 (unsigned long long) ino);
160 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
161 return XFS_ERROR(EFSCORRUPTED);
162 }
163 return 0;
164}
165
166
167
168
169int
170xfs_dir_init(
171 xfs_trans_t *tp,
172 xfs_inode_t *dp,
173 xfs_inode_t *pdp)
174{
175 xfs_da_args_t args;
176 int error;
177
178 memset((char *)&args, 0, sizeof(args));
179 args.dp = dp;
180 args.trans = tp;
181 ASSERT(S_ISDIR(dp->i_d.di_mode));
182 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
183 return error;
184 return xfs_dir2_sf_create(&args, pdp->i_ino);
185}
186
187
188
189
190int
191xfs_dir_createname(
192 xfs_trans_t *tp,
193 xfs_inode_t *dp,
194 struct xfs_name *name,
195 xfs_ino_t inum,
196 xfs_fsblock_t *first,
197 xfs_bmap_free_t *flist,
198 xfs_extlen_t total)
199{
200 xfs_da_args_t args;
201 int rval;
202 int v;
203
204 ASSERT(S_ISDIR(dp->i_d.di_mode));
205 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
206 return rval;
207 XFS_STATS_INC(xs_dir_create);
208
209 memset(&args, 0, sizeof(xfs_da_args_t));
210 args.name = name->name;
211 args.namelen = name->len;
212 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
213 args.inumber = inum;
214 args.dp = dp;
215 args.firstblock = first;
216 args.flist = flist;
217 args.total = total;
218 args.whichfork = XFS_DATA_FORK;
219 args.trans = tp;
220 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
221
222 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
223 rval = xfs_dir2_sf_addname(&args);
224 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
225 return rval;
226 else if (v)
227 rval = xfs_dir2_block_addname(&args);
228 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
229 return rval;
230 else if (v)
231 rval = xfs_dir2_leaf_addname(&args);
232 else
233 rval = xfs_dir2_node_addname(&args);
234 return rval;
235}
236
237
238
239
240
241int
242xfs_dir_cilookup_result(
243 struct xfs_da_args *args,
244 const unsigned char *name,
245 int len)
246{
247 if (args->cmpresult == XFS_CMP_DIFFERENT)
248 return ENOENT;
249 if (args->cmpresult != XFS_CMP_CASE ||
250 !(args->op_flags & XFS_DA_OP_CILOOKUP))
251 return EEXIST;
252
253 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
254 if (!args->value)
255 return ENOMEM;
256
257 memcpy(args->value, name, len);
258 args->valuelen = len;
259 return EEXIST;
260}
261
262
263
264
265
266
267
268int
269xfs_dir_lookup(
270 xfs_trans_t *tp,
271 xfs_inode_t *dp,
272 struct xfs_name *name,
273 xfs_ino_t *inum,
274 struct xfs_name *ci_name)
275{
276 xfs_da_args_t args;
277 int rval;
278 int v;
279
280 ASSERT(S_ISDIR(dp->i_d.di_mode));
281 XFS_STATS_INC(xs_dir_lookup);
282
283 memset(&args, 0, sizeof(xfs_da_args_t));
284 args.name = name->name;
285 args.namelen = name->len;
286 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
287 args.dp = dp;
288 args.whichfork = XFS_DATA_FORK;
289 args.trans = tp;
290 args.op_flags = XFS_DA_OP_OKNOENT;
291 if (ci_name)
292 args.op_flags |= XFS_DA_OP_CILOOKUP;
293
294 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
295 rval = xfs_dir2_sf_lookup(&args);
296 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
297 return rval;
298 else if (v)
299 rval = xfs_dir2_block_lookup(&args);
300 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
301 return rval;
302 else if (v)
303 rval = xfs_dir2_leaf_lookup(&args);
304 else
305 rval = xfs_dir2_node_lookup(&args);
306 if (rval == EEXIST)
307 rval = 0;
308 if (!rval) {
309 *inum = args.inumber;
310 if (ci_name) {
311 ci_name->name = args.value;
312 ci_name->len = args.valuelen;
313 }
314 }
315 return rval;
316}
317
318
319
320
321int
322xfs_dir_removename(
323 xfs_trans_t *tp,
324 xfs_inode_t *dp,
325 struct xfs_name *name,
326 xfs_ino_t ino,
327 xfs_fsblock_t *first,
328 xfs_bmap_free_t *flist,
329 xfs_extlen_t total)
330{
331 xfs_da_args_t args;
332 int rval;
333 int v;
334
335 ASSERT(S_ISDIR(dp->i_d.di_mode));
336 XFS_STATS_INC(xs_dir_remove);
337
338 memset(&args, 0, sizeof(xfs_da_args_t));
339 args.name = name->name;
340 args.namelen = name->len;
341 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
342 args.inumber = ino;
343 args.dp = dp;
344 args.firstblock = first;
345 args.flist = flist;
346 args.total = total;
347 args.whichfork = XFS_DATA_FORK;
348 args.trans = tp;
349
350 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
351 rval = xfs_dir2_sf_removename(&args);
352 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
353 return rval;
354 else if (v)
355 rval = xfs_dir2_block_removename(&args);
356 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
357 return rval;
358 else if (v)
359 rval = xfs_dir2_leaf_removename(&args);
360 else
361 rval = xfs_dir2_node_removename(&args);
362 return rval;
363}
364
365
366
367
368int
369xfs_readdir(
370 xfs_inode_t *dp,
371 struct dir_context *ctx,
372 size_t bufsize)
373{
374 int rval;
375 int v;
376
377 trace_xfs_readdir(dp);
378
379 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
380 return XFS_ERROR(EIO);
381
382 ASSERT(S_ISDIR(dp->i_d.di_mode));
383 XFS_STATS_INC(xs_dir_getdents);
384
385 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
386 rval = xfs_dir2_sf_getdents(dp, ctx);
387 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
388 ;
389 else if (v)
390 rval = xfs_dir2_block_getdents(dp, ctx);
391 else
392 rval = xfs_dir2_leaf_getdents(dp, ctx, bufsize);
393 return rval;
394}
395
396
397
398
399int
400xfs_dir_replace(
401 xfs_trans_t *tp,
402 xfs_inode_t *dp,
403 struct xfs_name *name,
404 xfs_ino_t inum,
405 xfs_fsblock_t *first,
406 xfs_bmap_free_t *flist,
407 xfs_extlen_t total)
408{
409 xfs_da_args_t args;
410 int rval;
411 int v;
412
413 ASSERT(S_ISDIR(dp->i_d.di_mode));
414
415 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
416 return rval;
417
418 memset(&args, 0, sizeof(xfs_da_args_t));
419 args.name = name->name;
420 args.namelen = name->len;
421 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
422 args.inumber = inum;
423 args.dp = dp;
424 args.firstblock = first;
425 args.flist = flist;
426 args.total = total;
427 args.whichfork = XFS_DATA_FORK;
428 args.trans = tp;
429
430 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
431 rval = xfs_dir2_sf_replace(&args);
432 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
433 return rval;
434 else if (v)
435 rval = xfs_dir2_block_replace(&args);
436 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
437 return rval;
438 else if (v)
439 rval = xfs_dir2_leaf_replace(&args);
440 else
441 rval = xfs_dir2_node_replace(&args);
442 return rval;
443}
444
445
446
447
448
449int
450xfs_dir_canenter(
451 xfs_trans_t *tp,
452 xfs_inode_t *dp,
453 struct xfs_name *name,
454 uint resblks)
455{
456 xfs_da_args_t args;
457 int rval;
458 int v;
459
460 if (resblks)
461 return 0;
462
463 ASSERT(S_ISDIR(dp->i_d.di_mode));
464
465 memset(&args, 0, sizeof(xfs_da_args_t));
466 args.name = name->name;
467 args.namelen = name->len;
468 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
469 args.dp = dp;
470 args.whichfork = XFS_DATA_FORK;
471 args.trans = tp;
472 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
473 XFS_DA_OP_OKNOENT;
474
475 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
476 rval = xfs_dir2_sf_addname(&args);
477 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
478 return rval;
479 else if (v)
480 rval = xfs_dir2_block_addname(&args);
481 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
482 return rval;
483 else if (v)
484 rval = xfs_dir2_leaf_addname(&args);
485 else
486 rval = xfs_dir2_node_addname(&args);
487 return rval;
488}
489
490
491
492
493
494
495
496
497
498
499
500int
501xfs_dir2_grow_inode(
502 struct xfs_da_args *args,
503 int space,
504 xfs_dir2_db_t *dbp)
505{
506 struct xfs_inode *dp = args->dp;
507 struct xfs_mount *mp = dp->i_mount;
508 xfs_fileoff_t bno;
509 int count;
510 int error;
511
512 trace_xfs_dir2_grow_inode(args, space);
513
514
515
516
517 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
518 count = mp->m_dirblkfsbs;
519
520 error = xfs_da_grow_inode_int(args, &bno, count);
521 if (error)
522 return error;
523
524 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
525
526
527
528
529 if (space == XFS_DIR2_DATA_SPACE) {
530 xfs_fsize_t size;
531
532 size = XFS_FSB_TO_B(mp, bno + count);
533 if (size > dp->i_d.di_size) {
534 dp->i_d.di_size = size;
535 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
536 }
537 }
538 return 0;
539}
540
541
542
543
544int
545xfs_dir2_isblock(
546 xfs_trans_t *tp,
547 xfs_inode_t *dp,
548 int *vp)
549{
550 xfs_fileoff_t last;
551 xfs_mount_t *mp;
552 int rval;
553
554 mp = dp->i_mount;
555 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
556 return rval;
557 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
558 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
559 *vp = rval;
560 return 0;
561}
562
563
564
565
566int
567xfs_dir2_isleaf(
568 xfs_trans_t *tp,
569 xfs_inode_t *dp,
570 int *vp)
571{
572 xfs_fileoff_t last;
573 xfs_mount_t *mp;
574 int rval;
575
576 mp = dp->i_mount;
577 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
578 return rval;
579 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
580 return 0;
581}
582
583
584
585
586
587
588int
589xfs_dir2_shrink_inode(
590 xfs_da_args_t *args,
591 xfs_dir2_db_t db,
592 struct xfs_buf *bp)
593{
594 xfs_fileoff_t bno;
595 xfs_dablk_t da;
596 int done;
597 xfs_inode_t *dp;
598 int error;
599 xfs_mount_t *mp;
600 xfs_trans_t *tp;
601
602 trace_xfs_dir2_shrink_inode(args, db);
603
604 dp = args->dp;
605 mp = dp->i_mount;
606 tp = args->trans;
607 da = xfs_dir2_db_to_da(mp, db);
608
609
610
611 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
612 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
613 &done))) {
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628 return error;
629 }
630 ASSERT(done);
631
632
633
634 xfs_trans_binval(tp, bp);
635
636
637
638 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
639 return 0;
640
641
642
643 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
644 return 0;
645 bno = da;
646 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
647
648
649
650 return error;
651 }
652 if (db == mp->m_dirdatablk)
653 ASSERT(bno == 0);
654 else
655 ASSERT(bno > 0);
656
657
658
659 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
660 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
661 return 0;
662}
663