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18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_bit.h"
25#include "xfs_mount.h"
26#include "xfs_inode.h"
27#include "xfs_trans.h"
28#include "xfs_inode_item.h"
29#include "xfs_alloc.h"
30#include "xfs_btree.h"
31#include "xfs_bmap_btree.h"
32#include "xfs_bmap.h"
33#include "xfs_error.h"
34#include "xfs_quota.h"
35#include "xfs_trace.h"
36#include "xfs_cksum.h"
37
38
39
40
41
42STATIC xfs_exntst_t
43xfs_extent_state(
44 xfs_filblks_t blks,
45 int extent_flag)
46{
47 if (extent_flag) {
48 ASSERT(blks != 0);
49 return XFS_EXT_UNWRITTEN;
50 }
51 return XFS_EXT_NORM;
52}
53
54
55
56
57void
58xfs_bmdr_to_bmbt(
59 struct xfs_inode *ip,
60 xfs_bmdr_block_t *dblock,
61 int dblocklen,
62 struct xfs_btree_block *rblock,
63 int rblocklen)
64{
65 struct xfs_mount *mp = ip->i_mount;
66 int dmxr;
67 xfs_bmbt_key_t *fkp;
68 __be64 *fpp;
69 xfs_bmbt_key_t *tkp;
70 __be64 *tpp;
71
72 if (xfs_sb_version_hascrc(&mp->m_sb))
73 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
74 XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
75 XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
76 else
77 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
78 XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
79 XFS_BTREE_LONG_PTRS);
80
81 rblock->bb_level = dblock->bb_level;
82 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
83 rblock->bb_numrecs = dblock->bb_numrecs;
84 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
85 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
86 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
87 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
88 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
89 dmxr = be16_to_cpu(dblock->bb_numrecs);
90 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
91 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
92}
93
94
95
96
97
98
99STATIC void
100__xfs_bmbt_get_all(
101 __uint64_t l0,
102 __uint64_t l1,
103 xfs_bmbt_irec_t *s)
104{
105 int ext_flag;
106 xfs_exntst_t st;
107
108 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
109 s->br_startoff = ((xfs_fileoff_t)l0 &
110 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
111 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
112 (((xfs_fsblock_t)l1) >> 21);
113 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
114
115 if (ext_flag) {
116 ASSERT(s->br_blockcount != 0);
117 st = XFS_EXT_UNWRITTEN;
118 } else
119 st = XFS_EXT_NORM;
120 s->br_state = st;
121}
122
123void
124xfs_bmbt_get_all(
125 xfs_bmbt_rec_host_t *r,
126 xfs_bmbt_irec_t *s)
127{
128 __xfs_bmbt_get_all(r->l0, r->l1, s);
129}
130
131
132
133
134xfs_filblks_t
135xfs_bmbt_get_blockcount(
136 xfs_bmbt_rec_host_t *r)
137{
138 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
139}
140
141
142
143
144xfs_fsblock_t
145xfs_bmbt_get_startblock(
146 xfs_bmbt_rec_host_t *r)
147{
148 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
149 (((xfs_fsblock_t)r->l1) >> 21);
150}
151
152
153
154
155xfs_fileoff_t
156xfs_bmbt_get_startoff(
157 xfs_bmbt_rec_host_t *r)
158{
159 return ((xfs_fileoff_t)r->l0 &
160 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
161}
162
163xfs_exntst_t
164xfs_bmbt_get_state(
165 xfs_bmbt_rec_host_t *r)
166{
167 int ext_flag;
168
169 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
170 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
171 ext_flag);
172}
173
174
175
176
177xfs_filblks_t
178xfs_bmbt_disk_get_blockcount(
179 xfs_bmbt_rec_t *r)
180{
181 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
182}
183
184
185
186
187xfs_fileoff_t
188xfs_bmbt_disk_get_startoff(
189 xfs_bmbt_rec_t *r)
190{
191 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
192 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
193}
194
195
196
197
198
199void
200xfs_bmbt_set_allf(
201 xfs_bmbt_rec_host_t *r,
202 xfs_fileoff_t startoff,
203 xfs_fsblock_t startblock,
204 xfs_filblks_t blockcount,
205 xfs_exntst_t state)
206{
207 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
208
209 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
210 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
211 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
212
213 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
214
215 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
216 ((xfs_bmbt_rec_base_t)startoff << 9) |
217 ((xfs_bmbt_rec_base_t)startblock >> 43);
218 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
219 ((xfs_bmbt_rec_base_t)blockcount &
220 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
221}
222
223
224
225
226void
227xfs_bmbt_set_all(
228 xfs_bmbt_rec_host_t *r,
229 xfs_bmbt_irec_t *s)
230{
231 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
232 s->br_blockcount, s->br_state);
233}
234
235
236
237
238
239void
240xfs_bmbt_disk_set_allf(
241 xfs_bmbt_rec_t *r,
242 xfs_fileoff_t startoff,
243 xfs_fsblock_t startblock,
244 xfs_filblks_t blockcount,
245 xfs_exntst_t state)
246{
247 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
248
249 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
250 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
251 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
252 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
253
254 r->l0 = cpu_to_be64(
255 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
256 ((xfs_bmbt_rec_base_t)startoff << 9) |
257 ((xfs_bmbt_rec_base_t)startblock >> 43));
258 r->l1 = cpu_to_be64(
259 ((xfs_bmbt_rec_base_t)startblock << 21) |
260 ((xfs_bmbt_rec_base_t)blockcount &
261 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
262}
263
264
265
266
267STATIC void
268xfs_bmbt_disk_set_all(
269 xfs_bmbt_rec_t *r,
270 xfs_bmbt_irec_t *s)
271{
272 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
273 s->br_blockcount, s->br_state);
274}
275
276
277
278
279void
280xfs_bmbt_set_blockcount(
281 xfs_bmbt_rec_host_t *r,
282 xfs_filblks_t v)
283{
284 ASSERT((v & xfs_mask64hi(43)) == 0);
285 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
286 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
287}
288
289
290
291
292void
293xfs_bmbt_set_startblock(
294 xfs_bmbt_rec_host_t *r,
295 xfs_fsblock_t v)
296{
297 ASSERT((v & xfs_mask64hi(12)) == 0);
298 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
299 (xfs_bmbt_rec_base_t)(v >> 43);
300 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
301 (xfs_bmbt_rec_base_t)(v << 21);
302}
303
304
305
306
307void
308xfs_bmbt_set_startoff(
309 xfs_bmbt_rec_host_t *r,
310 xfs_fileoff_t v)
311{
312 ASSERT((v & xfs_mask64hi(9)) == 0);
313 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
314 ((xfs_bmbt_rec_base_t)v << 9) |
315 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
316}
317
318
319
320
321void
322xfs_bmbt_set_state(
323 xfs_bmbt_rec_host_t *r,
324 xfs_exntst_t v)
325{
326 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
327 if (v == XFS_EXT_NORM)
328 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
329 else
330 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
331}
332
333
334
335
336void
337xfs_bmbt_to_bmdr(
338 struct xfs_mount *mp,
339 struct xfs_btree_block *rblock,
340 int rblocklen,
341 xfs_bmdr_block_t *dblock,
342 int dblocklen)
343{
344 int dmxr;
345 xfs_bmbt_key_t *fkp;
346 __be64 *fpp;
347 xfs_bmbt_key_t *tkp;
348 __be64 *tpp;
349
350 if (xfs_sb_version_hascrc(&mp->m_sb)) {
351 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
352 ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid,
353 &mp->m_sb.sb_meta_uuid));
354 ASSERT(rblock->bb_u.l.bb_blkno ==
355 cpu_to_be64(XFS_BUF_DADDR_NULL));
356 } else
357 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
358 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLFSBLOCK));
359 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK));
360 ASSERT(rblock->bb_level != 0);
361 dblock->bb_level = rblock->bb_level;
362 dblock->bb_numrecs = rblock->bb_numrecs;
363 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
364 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
365 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
366 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
367 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
368 dmxr = be16_to_cpu(dblock->bb_numrecs);
369 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
370 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
371}
372
373
374
375
376
377
378
379
380
381int
382xfs_check_nostate_extents(
383 xfs_ifork_t *ifp,
384 xfs_extnum_t idx,
385 xfs_extnum_t num)
386{
387 for (; num > 0; num--, idx++) {
388 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
389 if ((ep->l0 >>
390 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
391 ASSERT(0);
392 return 1;
393 }
394 }
395 return 0;
396}
397
398
399STATIC struct xfs_btree_cur *
400xfs_bmbt_dup_cursor(
401 struct xfs_btree_cur *cur)
402{
403 struct xfs_btree_cur *new;
404
405 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
406 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
407
408
409
410
411
412 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
413 new->bc_private.b.flist = cur->bc_private.b.flist;
414 new->bc_private.b.flags = cur->bc_private.b.flags;
415
416 return new;
417}
418
419STATIC void
420xfs_bmbt_update_cursor(
421 struct xfs_btree_cur *src,
422 struct xfs_btree_cur *dst)
423{
424 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
425 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
426 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
427
428 dst->bc_private.b.allocated += src->bc_private.b.allocated;
429 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
430
431 src->bc_private.b.allocated = 0;
432}
433
434STATIC int
435xfs_bmbt_alloc_block(
436 struct xfs_btree_cur *cur,
437 union xfs_btree_ptr *start,
438 union xfs_btree_ptr *new,
439 int *stat)
440{
441 xfs_alloc_arg_t args;
442 int error;
443
444 memset(&args, 0, sizeof(args));
445 args.tp = cur->bc_tp;
446 args.mp = cur->bc_mp;
447 args.fsbno = cur->bc_private.b.firstblock;
448 args.firstblock = args.fsbno;
449
450 if (args.fsbno == NULLFSBLOCK) {
451 args.fsbno = be64_to_cpu(start->l);
452 args.type = XFS_ALLOCTYPE_START_BNO;
453
454
455
456
457
458
459
460
461
462
463
464 args.minleft = args.tp->t_blk_res;
465 } else if (cur->bc_private.b.flist->xbf_low) {
466 args.type = XFS_ALLOCTYPE_START_BNO;
467 } else {
468 args.type = XFS_ALLOCTYPE_NEAR_BNO;
469 }
470
471 args.minlen = args.maxlen = args.prod = 1;
472 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
473 if (!args.wasdel && args.tp->t_blk_res == 0) {
474 error = -ENOSPC;
475 goto error0;
476 }
477 error = xfs_alloc_vextent(&args);
478 if (error)
479 goto error0;
480
481 if (args.fsbno == NULLFSBLOCK && args.minleft) {
482
483
484
485
486
487 args.fsbno = 0;
488 args.type = XFS_ALLOCTYPE_FIRST_AG;
489 args.minleft = 0;
490 error = xfs_alloc_vextent(&args);
491 if (error)
492 goto error0;
493 cur->bc_private.b.flist->xbf_low = 1;
494 }
495 if (args.fsbno == NULLFSBLOCK) {
496 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
497 *stat = 0;
498 return 0;
499 }
500 ASSERT(args.len == 1);
501 cur->bc_private.b.firstblock = args.fsbno;
502 cur->bc_private.b.allocated++;
503 cur->bc_private.b.ip->i_d.di_nblocks++;
504 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
505 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
506 XFS_TRANS_DQ_BCOUNT, 1L);
507
508 new->l = cpu_to_be64(args.fsbno);
509
510 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
511 *stat = 1;
512 return 0;
513
514 error0:
515 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
516 return error;
517}
518
519STATIC int
520xfs_bmbt_free_block(
521 struct xfs_btree_cur *cur,
522 struct xfs_buf *bp)
523{
524 struct xfs_mount *mp = cur->bc_mp;
525 struct xfs_inode *ip = cur->bc_private.b.ip;
526 struct xfs_trans *tp = cur->bc_tp;
527 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
528
529 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
530 ip->i_d.di_nblocks--;
531
532 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
533 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
534 return 0;
535}
536
537STATIC int
538xfs_bmbt_get_minrecs(
539 struct xfs_btree_cur *cur,
540 int level)
541{
542 if (level == cur->bc_nlevels - 1) {
543 struct xfs_ifork *ifp;
544
545 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
546 cur->bc_private.b.whichfork);
547
548 return xfs_bmbt_maxrecs(cur->bc_mp,
549 ifp->if_broot_bytes, level == 0) / 2;
550 }
551
552 return cur->bc_mp->m_bmap_dmnr[level != 0];
553}
554
555int
556xfs_bmbt_get_maxrecs(
557 struct xfs_btree_cur *cur,
558 int level)
559{
560 if (level == cur->bc_nlevels - 1) {
561 struct xfs_ifork *ifp;
562
563 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
564 cur->bc_private.b.whichfork);
565
566 return xfs_bmbt_maxrecs(cur->bc_mp,
567 ifp->if_broot_bytes, level == 0);
568 }
569
570 return cur->bc_mp->m_bmap_dmxr[level != 0];
571
572}
573
574
575
576
577
578
579
580
581
582
583STATIC int
584xfs_bmbt_get_dmaxrecs(
585 struct xfs_btree_cur *cur,
586 int level)
587{
588 if (level != cur->bc_nlevels - 1)
589 return cur->bc_mp->m_bmap_dmxr[level != 0];
590 return xfs_bmdr_maxrecs(cur->bc_private.b.forksize, level == 0);
591}
592
593STATIC void
594xfs_bmbt_init_key_from_rec(
595 union xfs_btree_key *key,
596 union xfs_btree_rec *rec)
597{
598 key->bmbt.br_startoff =
599 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
600}
601
602STATIC void
603xfs_bmbt_init_rec_from_key(
604 union xfs_btree_key *key,
605 union xfs_btree_rec *rec)
606{
607 ASSERT(key->bmbt.br_startoff != 0);
608
609 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
610 0, 0, XFS_EXT_NORM);
611}
612
613STATIC void
614xfs_bmbt_init_rec_from_cur(
615 struct xfs_btree_cur *cur,
616 union xfs_btree_rec *rec)
617{
618 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
619}
620
621STATIC void
622xfs_bmbt_init_ptr_from_cur(
623 struct xfs_btree_cur *cur,
624 union xfs_btree_ptr *ptr)
625{
626 ptr->l = 0;
627}
628
629STATIC __int64_t
630xfs_bmbt_key_diff(
631 struct xfs_btree_cur *cur,
632 union xfs_btree_key *key)
633{
634 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
635 cur->bc_rec.b.br_startoff;
636}
637
638static bool
639xfs_bmbt_verify(
640 struct xfs_buf *bp)
641{
642 struct xfs_mount *mp = bp->b_target->bt_mount;
643 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
644 unsigned int level;
645
646 switch (block->bb_magic) {
647 case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
648 if (!xfs_sb_version_hascrc(&mp->m_sb))
649 return false;
650 if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
651 return false;
652 if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
653 return false;
654
655
656
657
658 if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
659 return false;
660
661 case cpu_to_be32(XFS_BMAP_MAGIC):
662 break;
663 default:
664 return false;
665 }
666
667
668
669
670
671
672
673
674 level = be16_to_cpu(block->bb_level);
675 if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
676 return false;
677 if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
678 return false;
679
680
681 if (!block->bb_u.l.bb_leftsib ||
682 (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
683 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
684 return false;
685 if (!block->bb_u.l.bb_rightsib ||
686 (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
687 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
688 return false;
689
690 return true;
691}
692
693static void
694xfs_bmbt_read_verify(
695 struct xfs_buf *bp)
696{
697 if (!xfs_btree_lblock_verify_crc(bp))
698 xfs_buf_ioerror(bp, -EFSBADCRC);
699 else if (!xfs_bmbt_verify(bp))
700 xfs_buf_ioerror(bp, -EFSCORRUPTED);
701
702 if (bp->b_error) {
703 trace_xfs_btree_corrupt(bp, _RET_IP_);
704 xfs_verifier_error(bp);
705 }
706}
707
708static void
709xfs_bmbt_write_verify(
710 struct xfs_buf *bp)
711{
712 if (!xfs_bmbt_verify(bp)) {
713 trace_xfs_btree_corrupt(bp, _RET_IP_);
714 xfs_buf_ioerror(bp, -EFSCORRUPTED);
715 xfs_verifier_error(bp);
716 return;
717 }
718 xfs_btree_lblock_calc_crc(bp);
719}
720
721const struct xfs_buf_ops xfs_bmbt_buf_ops = {
722 .name = "xfs_bmbt",
723 .verify_read = xfs_bmbt_read_verify,
724 .verify_write = xfs_bmbt_write_verify,
725};
726
727
728#if defined(DEBUG) || defined(XFS_WARN)
729STATIC int
730xfs_bmbt_keys_inorder(
731 struct xfs_btree_cur *cur,
732 union xfs_btree_key *k1,
733 union xfs_btree_key *k2)
734{
735 return be64_to_cpu(k1->bmbt.br_startoff) <
736 be64_to_cpu(k2->bmbt.br_startoff);
737}
738
739STATIC int
740xfs_bmbt_recs_inorder(
741 struct xfs_btree_cur *cur,
742 union xfs_btree_rec *r1,
743 union xfs_btree_rec *r2)
744{
745 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
746 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
747 xfs_bmbt_disk_get_startoff(&r2->bmbt);
748}
749#endif
750
751static const struct xfs_btree_ops xfs_bmbt_ops = {
752 .rec_len = sizeof(xfs_bmbt_rec_t),
753 .key_len = sizeof(xfs_bmbt_key_t),
754
755 .dup_cursor = xfs_bmbt_dup_cursor,
756 .update_cursor = xfs_bmbt_update_cursor,
757 .alloc_block = xfs_bmbt_alloc_block,
758 .free_block = xfs_bmbt_free_block,
759 .get_maxrecs = xfs_bmbt_get_maxrecs,
760 .get_minrecs = xfs_bmbt_get_minrecs,
761 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
762 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
763 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
764 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
765 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
766 .key_diff = xfs_bmbt_key_diff,
767 .buf_ops = &xfs_bmbt_buf_ops,
768#if defined(DEBUG) || defined(XFS_WARN)
769 .keys_inorder = xfs_bmbt_keys_inorder,
770 .recs_inorder = xfs_bmbt_recs_inorder,
771#endif
772};
773
774
775
776
777struct xfs_btree_cur *
778xfs_bmbt_init_cursor(
779 struct xfs_mount *mp,
780 struct xfs_trans *tp,
781 struct xfs_inode *ip,
782 int whichfork)
783{
784 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
785 struct xfs_btree_cur *cur;
786
787 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
788
789 cur->bc_tp = tp;
790 cur->bc_mp = mp;
791 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
792 cur->bc_btnum = XFS_BTNUM_BMAP;
793 cur->bc_blocklog = mp->m_sb.sb_blocklog;
794
795 cur->bc_ops = &xfs_bmbt_ops;
796 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
797 if (xfs_sb_version_hascrc(&mp->m_sb))
798 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
799
800 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
801 cur->bc_private.b.ip = ip;
802 cur->bc_private.b.firstblock = NULLFSBLOCK;
803 cur->bc_private.b.flist = NULL;
804 cur->bc_private.b.allocated = 0;
805 cur->bc_private.b.flags = 0;
806 cur->bc_private.b.whichfork = whichfork;
807
808 return cur;
809}
810
811
812
813
814int
815xfs_bmbt_maxrecs(
816 struct xfs_mount *mp,
817 int blocklen,
818 int leaf)
819{
820 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
821
822 if (leaf)
823 return blocklen / sizeof(xfs_bmbt_rec_t);
824 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
825}
826
827
828
829
830int
831xfs_bmdr_maxrecs(
832 int blocklen,
833 int leaf)
834{
835 blocklen -= sizeof(xfs_bmdr_block_t);
836
837 if (leaf)
838 return blocklen / sizeof(xfs_bmdr_rec_t);
839 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
840}
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859int
860xfs_bmbt_change_owner(
861 struct xfs_trans *tp,
862 struct xfs_inode *ip,
863 int whichfork,
864 xfs_ino_t new_owner,
865 struct list_head *buffer_list)
866{
867 struct xfs_btree_cur *cur;
868 int error;
869
870 ASSERT(tp || buffer_list);
871 ASSERT(!(tp && buffer_list));
872 if (whichfork == XFS_DATA_FORK)
873 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
874 else
875 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
876
877 cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
878 if (!cur)
879 return -ENOMEM;
880
881 error = xfs_btree_change_owner(cur, new_owner, buffer_list);
882 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
883 return error;
884}
885