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19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_types.h"
22#include "xfs_log.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_dinode.h"
30#include "xfs_inode.h"
31#include "xfs_inode_item.h"
32#include "xfs_bmap.h"
33#include "xfs_buf_item.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_trace.h"
39#include "xfs_cksum.h"
40
41
42
43
44static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, struct xfs_buf *bp,
45 int first, int last);
46static void xfs_dir2_block_log_tail(xfs_trans_t *tp, struct xfs_buf *bp);
47static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, struct xfs_buf **bpp,
48 int *entno);
49static int xfs_dir2_block_sort(const void *a, const void *b);
50
51static xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot;
52
53
54
55
56void
57xfs_dir_startup(void)
58{
59 xfs_dir_hash_dot = xfs_da_hashname((unsigned char *)".", 1);
60 xfs_dir_hash_dotdot = xfs_da_hashname((unsigned char *)"..", 2);
61}
62
63static bool
64xfs_dir3_block_verify(
65 struct xfs_buf *bp)
66{
67 struct xfs_mount *mp = bp->b_target->bt_mount;
68 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
69
70 if (xfs_sb_version_hascrc(&mp->m_sb)) {
71 if (hdr3->magic != cpu_to_be32(XFS_DIR3_BLOCK_MAGIC))
72 return false;
73 if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid))
74 return false;
75 if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
76 return false;
77 } else {
78 if (hdr3->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))
79 return false;
80 }
81 if (__xfs_dir3_data_check(NULL, bp))
82 return false;
83 return true;
84}
85
86static void
87xfs_dir3_block_read_verify(
88 struct xfs_buf *bp)
89{
90 struct xfs_mount *mp = bp->b_target->bt_mount;
91
92 if ((xfs_sb_version_hascrc(&mp->m_sb) &&
93 !xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
94 XFS_DIR3_DATA_CRC_OFF)) ||
95 !xfs_dir3_block_verify(bp)) {
96 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
97 xfs_buf_ioerror(bp, EFSCORRUPTED);
98 }
99}
100
101static void
102xfs_dir3_block_write_verify(
103 struct xfs_buf *bp)
104{
105 struct xfs_mount *mp = bp->b_target->bt_mount;
106 struct xfs_buf_log_item *bip = bp->b_fspriv;
107 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
108
109 if (!xfs_dir3_block_verify(bp)) {
110 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
111 xfs_buf_ioerror(bp, EFSCORRUPTED);
112 return;
113 }
114
115 if (!xfs_sb_version_hascrc(&mp->m_sb))
116 return;
117
118 if (bip)
119 hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
120
121 xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_DATA_CRC_OFF);
122}
123
124const struct xfs_buf_ops xfs_dir3_block_buf_ops = {
125 .verify_read = xfs_dir3_block_read_verify,
126 .verify_write = xfs_dir3_block_write_verify,
127};
128
129static int
130xfs_dir3_block_read(
131 struct xfs_trans *tp,
132 struct xfs_inode *dp,
133 struct xfs_buf **bpp)
134{
135 struct xfs_mount *mp = dp->i_mount;
136 int err;
137
138 err = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, bpp,
139 XFS_DATA_FORK, &xfs_dir3_block_buf_ops);
140 if (!err && tp)
141 xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_BLOCK_BUF);
142 return err;
143}
144
145static void
146xfs_dir3_block_init(
147 struct xfs_mount *mp,
148 struct xfs_trans *tp,
149 struct xfs_buf *bp,
150 struct xfs_inode *dp)
151{
152 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
153
154 bp->b_ops = &xfs_dir3_block_buf_ops;
155 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_BLOCK_BUF);
156
157 if (xfs_sb_version_hascrc(&mp->m_sb)) {
158 memset(hdr3, 0, sizeof(*hdr3));
159 hdr3->magic = cpu_to_be32(XFS_DIR3_BLOCK_MAGIC);
160 hdr3->blkno = cpu_to_be64(bp->b_bn);
161 hdr3->owner = cpu_to_be64(dp->i_ino);
162 uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid);
163 return;
164
165 }
166 hdr3->magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
167}
168
169static void
170xfs_dir2_block_need_space(
171 struct xfs_dir2_data_hdr *hdr,
172 struct xfs_dir2_block_tail *btp,
173 struct xfs_dir2_leaf_entry *blp,
174 __be16 **tagpp,
175 struct xfs_dir2_data_unused **dupp,
176 struct xfs_dir2_data_unused **enddupp,
177 int *compact,
178 int len)
179{
180 struct xfs_dir2_data_free *bf;
181 __be16 *tagp = NULL;
182 struct xfs_dir2_data_unused *dup = NULL;
183 struct xfs_dir2_data_unused *enddup = NULL;
184
185 *compact = 0;
186 bf = xfs_dir3_data_bestfree_p(hdr);
187
188
189
190
191 if (btp->stale) {
192 if (be16_to_cpu(bf[0].length) >= len) {
193
194
195
196 dup = (xfs_dir2_data_unused_t *)
197 ((char *)hdr + be16_to_cpu(bf[0].offset));
198 goto out;
199 }
200
201
202
203
204
205 *compact = 1;
206 tagp = (__be16 *)blp - 1;
207
208
209 dup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
210
211
212
213
214
215 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
216 if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) *
217 (uint)sizeof(*blp) < len)
218 dup = NULL;
219 } else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len)
220 dup = NULL;
221 else
222 dup = (xfs_dir2_data_unused_t *)blp;
223 goto out;
224 }
225
226
227
228
229
230 tagp = (__be16 *)blp - 1;
231
232
233 enddup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
234
235
236
237
238
239
240 if (be16_to_cpu(enddup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
241
242
243
244 dup = (xfs_dir2_data_unused_t *)
245 ((char *)hdr + be16_to_cpu(bf[0].offset));
246 if (dup != enddup) {
247
248
249
250 if (be16_to_cpu(dup->length) < len)
251 dup = NULL;
252 goto out;
253 }
254
255
256
257
258 if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) {
259
260
261
262 if (be16_to_cpu(bf[1].length) >= len)
263 dup = (xfs_dir2_data_unused_t *)
264 ((char *)hdr + be16_to_cpu(bf[1].offset));
265 else
266 dup = NULL;
267 }
268 }
269out:
270 *tagpp = tagp;
271 *dupp = dup;
272 *enddupp = enddup;
273}
274
275
276
277
278
279
280static void
281xfs_dir2_block_compact(
282 struct xfs_trans *tp,
283 struct xfs_buf *bp,
284 struct xfs_dir2_data_hdr *hdr,
285 struct xfs_dir2_block_tail *btp,
286 struct xfs_dir2_leaf_entry *blp,
287 int *needlog,
288 int *lfloghigh,
289 int *lfloglow)
290{
291 int fromidx;
292 int toidx;
293 int needscan = 0;
294 int highstale;
295
296 fromidx = toidx = be32_to_cpu(btp->count) - 1;
297 highstale = *lfloghigh = -1;
298 for (; fromidx >= 0; fromidx--) {
299 if (blp[fromidx].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) {
300 if (highstale == -1)
301 highstale = toidx;
302 else {
303 if (*lfloghigh == -1)
304 *lfloghigh = toidx;
305 continue;
306 }
307 }
308 if (fromidx < toidx)
309 blp[toidx] = blp[fromidx];
310 toidx--;
311 }
312 *lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1);
313 *lfloghigh -= be32_to_cpu(btp->stale) - 1;
314 be32_add_cpu(&btp->count, -(be32_to_cpu(btp->stale) - 1));
315 xfs_dir2_data_make_free(tp, bp,
316 (xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr),
317 (xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)),
318 needlog, &needscan);
319 blp += be32_to_cpu(btp->stale) - 1;
320 btp->stale = cpu_to_be32(1);
321
322
323
324
325 if (needscan)
326 xfs_dir2_data_freescan(tp->t_mountp, hdr, needlog);
327}
328
329
330
331
332int
333xfs_dir2_block_addname(
334 xfs_da_args_t *args)
335{
336 xfs_dir2_data_hdr_t *hdr;
337 xfs_dir2_leaf_entry_t *blp;
338 struct xfs_buf *bp;
339 xfs_dir2_block_tail_t *btp;
340 int compact;
341 xfs_dir2_data_entry_t *dep;
342 xfs_inode_t *dp;
343 xfs_dir2_data_unused_t *dup;
344 int error;
345 xfs_dir2_data_unused_t *enddup=NULL;
346 xfs_dahash_t hash;
347 int high;
348 int highstale;
349 int lfloghigh=0;
350 int lfloglow=0;
351 int len;
352 int low;
353 int lowstale;
354 int mid=0;
355 xfs_mount_t *mp;
356 int needlog;
357 int needscan;
358 __be16 *tagp;
359 xfs_trans_t *tp;
360
361 trace_xfs_dir2_block_addname(args);
362
363 dp = args->dp;
364 tp = args->trans;
365 mp = dp->i_mount;
366
367
368 error = xfs_dir3_block_read(tp, dp, &bp);
369 if (error)
370 return error;
371
372 len = xfs_dir2_data_entsize(args->namelen);
373
374
375
376
377 hdr = bp->b_addr;
378 btp = xfs_dir2_block_tail_p(mp, hdr);
379 blp = xfs_dir2_block_leaf_p(btp);
380
381
382
383
384
385 xfs_dir2_block_need_space(hdr, btp, blp, &tagp, &dup,
386 &enddup, &compact, len);
387
388
389
390
391 if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
392 xfs_trans_brelse(tp, bp);
393 if (!dup)
394 return XFS_ERROR(ENOSPC);
395 return 0;
396 }
397
398
399
400
401 if (!dup) {
402
403 if (args->total == 0)
404 return XFS_ERROR(ENOSPC);
405
406
407
408
409 error = xfs_dir2_block_to_leaf(args, bp);
410 if (error)
411 return error;
412 return xfs_dir2_leaf_addname(args);
413 }
414
415 needlog = needscan = 0;
416
417
418
419
420 if (compact) {
421 xfs_dir2_block_compact(tp, bp, hdr, btp, blp, &needlog,
422 &lfloghigh, &lfloglow);
423
424 blp = xfs_dir2_block_leaf_p(btp);
425 } else if (btp->stale) {
426
427
428
429
430 lfloglow = be32_to_cpu(btp->count);
431 lfloghigh = -1;
432 }
433
434
435
436
437 for (low = 0, high = be32_to_cpu(btp->count) - 1; low <= high; ) {
438 mid = (low + high) >> 1;
439 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
440 break;
441 if (hash < args->hashval)
442 low = mid + 1;
443 else
444 high = mid - 1;
445 }
446 while (mid >= 0 && be32_to_cpu(blp[mid].hashval) >= args->hashval) {
447 mid--;
448 }
449
450
451
452 if (!btp->stale) {
453
454
455
456 xfs_dir2_data_use_free(tp, bp, enddup,
457 (xfs_dir2_data_aoff_t)
458 ((char *)enddup - (char *)hdr + be16_to_cpu(enddup->length) -
459 sizeof(*blp)),
460 (xfs_dir2_data_aoff_t)sizeof(*blp),
461 &needlog, &needscan);
462
463
464
465 be32_add_cpu(&btp->count, 1);
466
467
468
469
470 if (needscan) {
471 xfs_dir2_data_freescan(mp, hdr, &needlog);
472 needscan = 0;
473 }
474
475
476
477
478
479 blp--;
480 mid++;
481 if (mid)
482 memmove(blp, &blp[1], mid * sizeof(*blp));
483 lfloglow = 0;
484 lfloghigh = mid;
485 }
486
487
488
489 else {
490 for (lowstale = mid;
491 lowstale >= 0 &&
492 blp[lowstale].address !=
493 cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
494 lowstale--)
495 continue;
496 for (highstale = mid + 1;
497 highstale < be32_to_cpu(btp->count) &&
498 blp[highstale].address !=
499 cpu_to_be32(XFS_DIR2_NULL_DATAPTR) &&
500 (lowstale < 0 || mid - lowstale > highstale - mid);
501 highstale++)
502 continue;
503
504
505
506 if (lowstale >= 0 &&
507 (highstale == be32_to_cpu(btp->count) ||
508 mid - lowstale <= highstale - mid)) {
509 if (mid - lowstale)
510 memmove(&blp[lowstale], &blp[lowstale + 1],
511 (mid - lowstale) * sizeof(*blp));
512 lfloglow = MIN(lowstale, lfloglow);
513 lfloghigh = MAX(mid, lfloghigh);
514 }
515
516
517
518 else {
519 ASSERT(highstale < be32_to_cpu(btp->count));
520 mid++;
521 if (highstale - mid)
522 memmove(&blp[mid + 1], &blp[mid],
523 (highstale - mid) * sizeof(*blp));
524 lfloglow = MIN(mid, lfloglow);
525 lfloghigh = MAX(highstale, lfloghigh);
526 }
527 be32_add_cpu(&btp->stale, -1);
528 }
529
530
531
532 dep = (xfs_dir2_data_entry_t *)dup;
533
534
535
536 blp[mid].hashval = cpu_to_be32(args->hashval);
537 blp[mid].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
538 (char *)dep - (char *)hdr));
539 xfs_dir2_block_log_leaf(tp, bp, lfloglow, lfloghigh);
540
541
542
543 xfs_dir2_data_use_free(tp, bp, dup,
544 (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr),
545 (xfs_dir2_data_aoff_t)len, &needlog, &needscan);
546
547
548
549 dep->inumber = cpu_to_be64(args->inumber);
550 dep->namelen = args->namelen;
551 memcpy(dep->name, args->name, args->namelen);
552 tagp = xfs_dir2_data_entry_tag_p(dep);
553 *tagp = cpu_to_be16((char *)dep - (char *)hdr);
554
555
556
557 if (needscan)
558 xfs_dir2_data_freescan(mp, hdr, &needlog);
559 if (needlog)
560 xfs_dir2_data_log_header(tp, bp);
561 xfs_dir2_block_log_tail(tp, bp);
562 xfs_dir2_data_log_entry(tp, bp, dep);
563 xfs_dir3_data_check(dp, bp);
564 return 0;
565}
566
567
568
569
570int
571xfs_dir2_block_getdents(
572 xfs_inode_t *dp,
573 struct dir_context *ctx)
574{
575 xfs_dir2_data_hdr_t *hdr;
576 struct xfs_buf *bp;
577 xfs_dir2_block_tail_t *btp;
578 xfs_dir2_data_entry_t *dep;
579 xfs_dir2_data_unused_t *dup;
580 char *endptr;
581 int error;
582 xfs_mount_t *mp;
583 char *ptr;
584 int wantoff;
585 xfs_off_t cook;
586
587 mp = dp->i_mount;
588
589
590
591 if (xfs_dir2_dataptr_to_db(mp, ctx->pos) > mp->m_dirdatablk)
592 return 0;
593
594 error = xfs_dir3_block_read(NULL, dp, &bp);
595 if (error)
596 return error;
597
598
599
600
601
602 wantoff = xfs_dir2_dataptr_to_off(mp, ctx->pos);
603 hdr = bp->b_addr;
604 xfs_dir3_data_check(dp, bp);
605
606
607
608 btp = xfs_dir2_block_tail_p(mp, hdr);
609 ptr = (char *)xfs_dir3_data_entry_p(hdr);
610 endptr = (char *)xfs_dir2_block_leaf_p(btp);
611
612
613
614
615
616 while (ptr < endptr) {
617 dup = (xfs_dir2_data_unused_t *)ptr;
618
619
620
621 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
622 ptr += be16_to_cpu(dup->length);
623 continue;
624 }
625
626 dep = (xfs_dir2_data_entry_t *)ptr;
627
628
629
630
631 ptr += xfs_dir2_data_entsize(dep->namelen);
632
633
634
635 if ((char *)dep - (char *)hdr < wantoff)
636 continue;
637
638 cook = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
639 (char *)dep - (char *)hdr);
640
641 ctx->pos = cook & 0x7fffffff;
642
643
644
645 if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
646 be64_to_cpu(dep->inumber), DT_UNKNOWN)) {
647 xfs_trans_brelse(NULL, bp);
648 return 0;
649 }
650 }
651
652
653
654
655
656 ctx->pos = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
657 0x7fffffff;
658 xfs_trans_brelse(NULL, bp);
659 return 0;
660}
661
662
663
664
665static void
666xfs_dir2_block_log_leaf(
667 xfs_trans_t *tp,
668 struct xfs_buf *bp,
669 int first,
670 int last)
671{
672 xfs_dir2_data_hdr_t *hdr = bp->b_addr;
673 xfs_dir2_leaf_entry_t *blp;
674 xfs_dir2_block_tail_t *btp;
675
676 btp = xfs_dir2_block_tail_p(tp->t_mountp, hdr);
677 blp = xfs_dir2_block_leaf_p(btp);
678 xfs_trans_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)hdr),
679 (uint)((char *)&blp[last + 1] - (char *)hdr - 1));
680}
681
682
683
684
685static void
686xfs_dir2_block_log_tail(
687 xfs_trans_t *tp,
688 struct xfs_buf *bp)
689{
690 xfs_dir2_data_hdr_t *hdr = bp->b_addr;
691 xfs_dir2_block_tail_t *btp;
692
693 btp = xfs_dir2_block_tail_p(tp->t_mountp, hdr);
694 xfs_trans_log_buf(tp, bp, (uint)((char *)btp - (char *)hdr),
695 (uint)((char *)(btp + 1) - (char *)hdr - 1));
696}
697
698
699
700
701
702int
703xfs_dir2_block_lookup(
704 xfs_da_args_t *args)
705{
706 xfs_dir2_data_hdr_t *hdr;
707 xfs_dir2_leaf_entry_t *blp;
708 struct xfs_buf *bp;
709 xfs_dir2_block_tail_t *btp;
710 xfs_dir2_data_entry_t *dep;
711 xfs_inode_t *dp;
712 int ent;
713 int error;
714 xfs_mount_t *mp;
715
716 trace_xfs_dir2_block_lookup(args);
717
718
719
720
721
722 if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
723 return error;
724 dp = args->dp;
725 mp = dp->i_mount;
726 hdr = bp->b_addr;
727 xfs_dir3_data_check(dp, bp);
728 btp = xfs_dir2_block_tail_p(mp, hdr);
729 blp = xfs_dir2_block_leaf_p(btp);
730
731
732
733 dep = (xfs_dir2_data_entry_t *)((char *)hdr +
734 xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
735
736
737
738 args->inumber = be64_to_cpu(dep->inumber);
739 error = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
740 xfs_trans_brelse(args->trans, bp);
741 return XFS_ERROR(error);
742}
743
744
745
746
747static int
748xfs_dir2_block_lookup_int(
749 xfs_da_args_t *args,
750 struct xfs_buf **bpp,
751 int *entno)
752{
753 xfs_dir2_dataptr_t addr;
754 xfs_dir2_data_hdr_t *hdr;
755 xfs_dir2_leaf_entry_t *blp;
756 struct xfs_buf *bp;
757 xfs_dir2_block_tail_t *btp;
758 xfs_dir2_data_entry_t *dep;
759 xfs_inode_t *dp;
760 int error;
761 xfs_dahash_t hash;
762 int high;
763 int low;
764 int mid;
765 xfs_mount_t *mp;
766 xfs_trans_t *tp;
767 enum xfs_dacmp cmp;
768
769 dp = args->dp;
770 tp = args->trans;
771 mp = dp->i_mount;
772
773 error = xfs_dir3_block_read(tp, dp, &bp);
774 if (error)
775 return error;
776
777 hdr = bp->b_addr;
778 xfs_dir3_data_check(dp, bp);
779 btp = xfs_dir2_block_tail_p(mp, hdr);
780 blp = xfs_dir2_block_leaf_p(btp);
781
782
783
784
785 for (low = 0, high = be32_to_cpu(btp->count) - 1; ; ) {
786 ASSERT(low <= high);
787 mid = (low + high) >> 1;
788 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
789 break;
790 if (hash < args->hashval)
791 low = mid + 1;
792 else
793 high = mid - 1;
794 if (low > high) {
795 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
796 xfs_trans_brelse(tp, bp);
797 return XFS_ERROR(ENOENT);
798 }
799 }
800
801
802
803 while (mid > 0 && be32_to_cpu(blp[mid - 1].hashval) == args->hashval) {
804 mid--;
805 }
806
807
808
809
810 do {
811 if ((addr = be32_to_cpu(blp[mid].address)) == XFS_DIR2_NULL_DATAPTR)
812 continue;
813
814
815
816 dep = (xfs_dir2_data_entry_t *)
817 ((char *)hdr + xfs_dir2_dataptr_to_off(mp, addr));
818
819
820
821
822
823 cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
824 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
825 args->cmpresult = cmp;
826 *bpp = bp;
827 *entno = mid;
828 if (cmp == XFS_CMP_EXACT)
829 return 0;
830 }
831 } while (++mid < be32_to_cpu(btp->count) &&
832 be32_to_cpu(blp[mid].hashval) == hash);
833
834 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
835
836
837
838
839 if (args->cmpresult == XFS_CMP_CASE)
840 return 0;
841
842
843
844 xfs_trans_brelse(tp, bp);
845 return XFS_ERROR(ENOENT);
846}
847
848
849
850
851
852int
853xfs_dir2_block_removename(
854 xfs_da_args_t *args)
855{
856 xfs_dir2_data_hdr_t *hdr;
857 xfs_dir2_leaf_entry_t *blp;
858 struct xfs_buf *bp;
859 xfs_dir2_block_tail_t *btp;
860 xfs_dir2_data_entry_t *dep;
861 xfs_inode_t *dp;
862 int ent;
863 int error;
864 xfs_mount_t *mp;
865 int needlog;
866 int needscan;
867 xfs_dir2_sf_hdr_t sfh;
868 int size;
869 xfs_trans_t *tp;
870
871 trace_xfs_dir2_block_removename(args);
872
873
874
875
876
877 if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
878 return error;
879 }
880 dp = args->dp;
881 tp = args->trans;
882 mp = dp->i_mount;
883 hdr = bp->b_addr;
884 btp = xfs_dir2_block_tail_p(mp, hdr);
885 blp = xfs_dir2_block_leaf_p(btp);
886
887
888
889 dep = (xfs_dir2_data_entry_t *)
890 ((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
891
892
893
894 needlog = needscan = 0;
895 xfs_dir2_data_make_free(tp, bp,
896 (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr),
897 xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
898
899
900
901 be32_add_cpu(&btp->stale, 1);
902 xfs_dir2_block_log_tail(tp, bp);
903
904
905
906 blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
907 xfs_dir2_block_log_leaf(tp, bp, ent, ent);
908
909
910
911 if (needscan)
912 xfs_dir2_data_freescan(mp, hdr, &needlog);
913 if (needlog)
914 xfs_dir2_data_log_header(tp, bp);
915 xfs_dir3_data_check(dp, bp);
916
917
918
919 size = xfs_dir2_block_sfsize(dp, hdr, &sfh);
920 if (size > XFS_IFORK_DSIZE(dp))
921 return 0;
922
923
924
925
926 return xfs_dir2_block_to_sf(args, bp, size, &sfh);
927}
928
929
930
931
932
933int
934xfs_dir2_block_replace(
935 xfs_da_args_t *args)
936{
937 xfs_dir2_data_hdr_t *hdr;
938 xfs_dir2_leaf_entry_t *blp;
939 struct xfs_buf *bp;
940 xfs_dir2_block_tail_t *btp;
941 xfs_dir2_data_entry_t *dep;
942 xfs_inode_t *dp;
943 int ent;
944 int error;
945 xfs_mount_t *mp;
946
947 trace_xfs_dir2_block_replace(args);
948
949
950
951
952
953 if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
954 return error;
955 }
956 dp = args->dp;
957 mp = dp->i_mount;
958 hdr = bp->b_addr;
959 btp = xfs_dir2_block_tail_p(mp, hdr);
960 blp = xfs_dir2_block_leaf_p(btp);
961
962
963
964 dep = (xfs_dir2_data_entry_t *)
965 ((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
966 ASSERT(be64_to_cpu(dep->inumber) != args->inumber);
967
968
969
970 dep->inumber = cpu_to_be64(args->inumber);
971 xfs_dir2_data_log_entry(args->trans, bp, dep);
972 xfs_dir3_data_check(dp, bp);
973 return 0;
974}
975
976
977
978
979static int
980xfs_dir2_block_sort(
981 const void *a,
982 const void *b)
983{
984 const xfs_dir2_leaf_entry_t *la;
985 const xfs_dir2_leaf_entry_t *lb;
986
987 la = a;
988 lb = b;
989 return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 :
990 (be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0);
991}
992
993
994
995
996int
997xfs_dir2_leaf_to_block(
998 xfs_da_args_t *args,
999 struct xfs_buf *lbp,
1000 struct xfs_buf *dbp)
1001{
1002 __be16 *bestsp;
1003 xfs_dir2_data_hdr_t *hdr;
1004 xfs_dir2_block_tail_t *btp;
1005 xfs_inode_t *dp;
1006 xfs_dir2_data_unused_t *dup;
1007 int error;
1008 int from;
1009 xfs_dir2_leaf_t *leaf;
1010 xfs_dir2_leaf_entry_t *lep;
1011 xfs_dir2_leaf_tail_t *ltp;
1012 xfs_mount_t *mp;
1013 int needlog;
1014 int needscan;
1015 xfs_dir2_sf_hdr_t sfh;
1016 int size;
1017 __be16 *tagp;
1018 int to;
1019 xfs_trans_t *tp;
1020 struct xfs_dir2_leaf_entry *ents;
1021 struct xfs_dir3_icleaf_hdr leafhdr;
1022
1023 trace_xfs_dir2_leaf_to_block(args);
1024
1025 dp = args->dp;
1026 tp = args->trans;
1027 mp = dp->i_mount;
1028 leaf = lbp->b_addr;
1029 xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
1030 ents = xfs_dir3_leaf_ents_p(leaf);
1031 ltp = xfs_dir2_leaf_tail_p(mp, leaf);
1032
1033 ASSERT(leafhdr.magic == XFS_DIR2_LEAF1_MAGIC ||
1034 leafhdr.magic == XFS_DIR3_LEAF1_MAGIC);
1035
1036
1037
1038
1039
1040
1041 while (dp->i_d.di_size > mp->m_dirblksize) {
1042 int hdrsz;
1043
1044 hdrsz = xfs_dir3_data_hdr_size(xfs_sb_version_hascrc(&mp->m_sb));
1045 bestsp = xfs_dir2_leaf_bests_p(ltp);
1046 if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) ==
1047 mp->m_dirblksize - hdrsz) {
1048 if ((error =
1049 xfs_dir2_leaf_trim_data(args, lbp,
1050 (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1))))
1051 return error;
1052 } else
1053 return 0;
1054 }
1055
1056
1057
1058 if (!dbp) {
1059 error = xfs_dir3_data_read(tp, dp, mp->m_dirdatablk, -1, &dbp);
1060 if (error)
1061 return error;
1062 }
1063 hdr = dbp->b_addr;
1064 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
1065 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC));
1066
1067
1068
1069
1070 size = (uint)sizeof(xfs_dir2_block_tail_t) +
1071 (uint)sizeof(*lep) * (leafhdr.count - leafhdr.stale);
1072
1073
1074
1075 tagp = (__be16 *)((char *)hdr + mp->m_dirblksize) - 1;
1076 dup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
1077
1078
1079
1080 if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG ||
1081 be16_to_cpu(dup->length) < size)
1082 return 0;
1083
1084
1085
1086
1087 xfs_dir3_block_init(mp, tp, dbp, dp);
1088
1089 needlog = 1;
1090 needscan = 0;
1091
1092
1093
1094 xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
1095 &needlog, &needscan);
1096
1097
1098
1099 btp = xfs_dir2_block_tail_p(mp, hdr);
1100 btp->count = cpu_to_be32(leafhdr.count - leafhdr.stale);
1101 btp->stale = 0;
1102 xfs_dir2_block_log_tail(tp, dbp);
1103
1104
1105
1106 lep = xfs_dir2_block_leaf_p(btp);
1107 for (from = to = 0; from < leafhdr.count; from++) {
1108 if (ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
1109 continue;
1110 lep[to++] = ents[from];
1111 }
1112 ASSERT(to == be32_to_cpu(btp->count));
1113 xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1);
1114
1115
1116
1117 if (needscan)
1118 xfs_dir2_data_freescan(mp, hdr, &needlog);
1119 if (needlog)
1120 xfs_dir2_data_log_header(tp, dbp);
1121
1122
1123
1124 error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
1125 if (error)
1126 return error;
1127
1128
1129
1130
1131 size = xfs_dir2_block_sfsize(dp, hdr, &sfh);
1132 if (size > XFS_IFORK_DSIZE(dp))
1133 return 0;
1134
1135 return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
1136}
1137
1138
1139
1140
1141int
1142xfs_dir2_sf_to_block(
1143 xfs_da_args_t *args)
1144{
1145 xfs_dir2_db_t blkno;
1146 xfs_dir2_data_hdr_t *hdr;
1147 xfs_dir2_leaf_entry_t *blp;
1148 struct xfs_buf *bp;
1149 xfs_dir2_block_tail_t *btp;
1150 xfs_dir2_data_entry_t *dep;
1151 xfs_inode_t *dp;
1152 int dummy;
1153 xfs_dir2_data_unused_t *dup;
1154 int endoffset;
1155 int error;
1156 int i;
1157 xfs_mount_t *mp;
1158 int needlog;
1159 int needscan;
1160 int newoffset;
1161 int offset;
1162 xfs_dir2_sf_entry_t *sfep;
1163 xfs_dir2_sf_hdr_t *oldsfp;
1164 xfs_dir2_sf_hdr_t *sfp;
1165 __be16 *tagp;
1166 xfs_trans_t *tp;
1167 struct xfs_name name;
1168 struct xfs_ifork *ifp;
1169
1170 trace_xfs_dir2_sf_to_block(args);
1171
1172 dp = args->dp;
1173 tp = args->trans;
1174 mp = dp->i_mount;
1175 ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK);
1176 ASSERT(ifp->if_flags & XFS_IFINLINE);
1177
1178
1179
1180 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1181 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1182 return XFS_ERROR(EIO);
1183 }
1184
1185 oldsfp = (xfs_dir2_sf_hdr_t *)ifp->if_u1.if_data;
1186
1187 ASSERT(ifp->if_bytes == dp->i_d.di_size);
1188 ASSERT(ifp->if_u1.if_data != NULL);
1189 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(oldsfp->i8count));
1190 ASSERT(dp->i_d.di_nextents == 0);
1191
1192
1193
1194
1195
1196 sfp = kmem_alloc(ifp->if_bytes, KM_SLEEP);
1197 memcpy(sfp, oldsfp, ifp->if_bytes);
1198
1199 xfs_idata_realloc(dp, -ifp->if_bytes, XFS_DATA_FORK);
1200 xfs_bmap_local_to_extents_empty(dp, XFS_DATA_FORK);
1201 dp->i_d.di_size = 0;
1202
1203
1204
1205
1206 error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
1207 if (error) {
1208 kmem_free(sfp);
1209 return error;
1210 }
1211
1212
1213
1214 error = xfs_dir3_data_init(args, blkno, &bp);
1215 if (error) {
1216 kmem_free(sfp);
1217 return error;
1218 }
1219 xfs_dir3_block_init(mp, tp, bp, dp);
1220 hdr = bp->b_addr;
1221
1222
1223
1224
1225 i = (uint)sizeof(*btp) +
1226 (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
1227
1228
1229
1230
1231 dup = xfs_dir3_data_unused_p(hdr);
1232 needlog = needscan = 0;
1233 xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
1234 &needscan);
1235 ASSERT(needscan == 0);
1236
1237
1238
1239 btp = xfs_dir2_block_tail_p(mp, hdr);
1240 btp->count = cpu_to_be32(sfp->count + 2);
1241 btp->stale = 0;
1242 blp = xfs_dir2_block_leaf_p(btp);
1243 endoffset = (uint)((char *)blp - (char *)hdr);
1244
1245
1246
1247 xfs_dir2_data_use_free(tp, bp, dup,
1248 (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr),
1249 be16_to_cpu(dup->length), &needlog, &needscan);
1250
1251
1252
1253 dep = xfs_dir3_data_dot_entry_p(hdr);
1254 dep->inumber = cpu_to_be64(dp->i_ino);
1255 dep->namelen = 1;
1256 dep->name[0] = '.';
1257 tagp = xfs_dir2_data_entry_tag_p(dep);
1258 *tagp = cpu_to_be16((char *)dep - (char *)hdr);
1259 xfs_dir2_data_log_entry(tp, bp, dep);
1260 blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
1261 blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1262 (char *)dep - (char *)hdr));
1263
1264
1265
1266 dep = xfs_dir3_data_dotdot_entry_p(hdr);
1267 dep->inumber = cpu_to_be64(xfs_dir2_sf_get_parent_ino(sfp));
1268 dep->namelen = 2;
1269 dep->name[0] = dep->name[1] = '.';
1270 tagp = xfs_dir2_data_entry_tag_p(dep);
1271 *tagp = cpu_to_be16((char *)dep - (char *)hdr);
1272 xfs_dir2_data_log_entry(tp, bp, dep);
1273 blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
1274 blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1275 (char *)dep - (char *)hdr));
1276 offset = xfs_dir3_data_first_offset(hdr);
1277
1278
1279
1280 i = 0;
1281 if (!sfp->count)
1282 sfep = NULL;
1283 else
1284 sfep = xfs_dir2_sf_firstentry(sfp);
1285
1286
1287
1288
1289 while (offset < endoffset) {
1290
1291
1292
1293 if (sfep == NULL)
1294 newoffset = endoffset;
1295 else
1296 newoffset = xfs_dir2_sf_get_offset(sfep);
1297
1298
1299
1300 if (offset < newoffset) {
1301 dup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
1302 dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1303 dup->length = cpu_to_be16(newoffset - offset);
1304 *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16(
1305 ((char *)dup - (char *)hdr));
1306 xfs_dir2_data_log_unused(tp, bp, dup);
1307 xfs_dir2_data_freeinsert(hdr, dup, &dummy);
1308 offset += be16_to_cpu(dup->length);
1309 continue;
1310 }
1311
1312
1313
1314 dep = (xfs_dir2_data_entry_t *)((char *)hdr + newoffset);
1315 dep->inumber = cpu_to_be64(xfs_dir2_sfe_get_ino(sfp, sfep));
1316 dep->namelen = sfep->namelen;
1317 memcpy(dep->name, sfep->name, dep->namelen);
1318 tagp = xfs_dir2_data_entry_tag_p(dep);
1319 *tagp = cpu_to_be16((char *)dep - (char *)hdr);
1320 xfs_dir2_data_log_entry(tp, bp, dep);
1321 name.name = sfep->name;
1322 name.len = sfep->namelen;
1323 blp[2 + i].hashval = cpu_to_be32(mp->m_dirnameops->
1324 hashname(&name));
1325 blp[2 + i].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1326 (char *)dep - (char *)hdr));
1327 offset = (int)((char *)(tagp + 1) - (char *)hdr);
1328 if (++i == sfp->count)
1329 sfep = NULL;
1330 else
1331 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
1332 }
1333
1334 kmem_free(sfp);
1335
1336
1337
1338 xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort);
1339
1340
1341
1342
1343 ASSERT(needscan == 0);
1344 xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1);
1345 xfs_dir2_block_log_tail(tp, bp);
1346 xfs_dir3_data_check(dp, bp);
1347 return 0;
1348}
1349