2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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.
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.
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
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.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"
33 #include "xfs_error.h"
34 #include "xfs_quota.h"
35 #include "xfs_trace.h"
36 #include "xfs_cksum.h"
39 * Determine the extent state.
48 ASSERT(blks != 0); /* saved for DMIG */
49 return XFS_EXT_UNWRITTEN;
55 * Convert on-disk form of btree root to in-memory form.
60 xfs_bmdr_block_t *dblock,
62 struct xfs_btree_block *rblock,
65 struct xfs_mount *mp = ip->i_mount;
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);
77 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
78 XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
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);
95 * Convert a compressed bmap extent record to an uncompressed form.
96 * This code must be in sync with the routines xfs_bmbt_get_startoff,
97 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
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 /* This is xfs_extent_state() in-line */
116 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
117 st = XFS_EXT_UNWRITTEN;
125 xfs_bmbt_rec_host_t *r,
128 __xfs_bmbt_get_all(r->l0, r->l1, s);
132 * Extract the blockcount field from an in memory bmap extent record.
135 xfs_bmbt_get_blockcount(
136 xfs_bmbt_rec_host_t *r)
138 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
142 * Extract the startblock field from an in memory bmap extent record.
145 xfs_bmbt_get_startblock(
146 xfs_bmbt_rec_host_t *r)
148 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
149 (((xfs_fsblock_t)r->l1) >> 21);
153 * Extract the startoff field from an in memory bmap extent record.
156 xfs_bmbt_get_startoff(
157 xfs_bmbt_rec_host_t *r)
159 return ((xfs_fileoff_t)r->l0 &
160 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
165 xfs_bmbt_rec_host_t *r)
169 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
170 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
175 * Extract the blockcount field from an on disk bmap extent record.
178 xfs_bmbt_disk_get_blockcount(
181 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
185 * Extract the startoff field from a disk format bmap extent record.
188 xfs_bmbt_disk_get_startoff(
191 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
192 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
197 * Set all the fields in a bmap extent record from the arguments.
201 xfs_bmbt_rec_host_t *r,
202 xfs_fileoff_t startoff,
203 xfs_fsblock_t startblock,
204 xfs_filblks_t blockcount,
207 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
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);
213 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
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));
224 * Set all the fields in a bmap extent record from the uncompressed form.
228 xfs_bmbt_rec_host_t *r,
231 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
232 s->br_blockcount, s->br_state);
237 * Set all the fields in a disk format bmap extent record from the arguments.
240 xfs_bmbt_disk_set_allf(
242 xfs_fileoff_t startoff,
243 xfs_fsblock_t startblock,
244 xfs_filblks_t blockcount,
247 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
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);
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));
259 ((xfs_bmbt_rec_base_t)startblock << 21) |
260 ((xfs_bmbt_rec_base_t)blockcount &
261 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
265 * Set all the fields in a bmap extent record from the uncompressed form.
268 xfs_bmbt_disk_set_all(
272 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
273 s->br_blockcount, s->br_state);
277 * Set the blockcount field in a bmap extent record.
280 xfs_bmbt_set_blockcount(
281 xfs_bmbt_rec_host_t *r,
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));
290 * Set the startblock field in a bmap extent record.
293 xfs_bmbt_set_startblock(
294 xfs_bmbt_rec_host_t *r,
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);
305 * Set the startoff field in a bmap extent record.
308 xfs_bmbt_set_startoff(
309 xfs_bmbt_rec_host_t *r,
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));
319 * Set the extent state field in a bmap extent record.
323 xfs_bmbt_rec_host_t *r,
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);
330 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
334 * Convert in-memory form of btree root to on-disk form.
338 struct xfs_mount *mp,
339 struct xfs_btree_block *rblock,
341 xfs_bmdr_block_t *dblock,
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, &mp->m_sb.sb_uuid));
353 ASSERT(rblock->bb_u.l.bb_blkno ==
354 cpu_to_be64(XFS_BUF_DADDR_NULL));
356 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
357 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLFSBLOCK));
358 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK));
359 ASSERT(rblock->bb_level != 0);
360 dblock->bb_level = rblock->bb_level;
361 dblock->bb_numrecs = rblock->bb_numrecs;
362 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
363 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
364 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
365 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
366 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
367 dmxr = be16_to_cpu(dblock->bb_numrecs);
368 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
369 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
373 * Check extent records, which have just been read, for
374 * any bit in the extent flag field. ASSERT on debug
375 * kernels, as this condition should not occur.
376 * Return an error condition (1) if any flags found,
377 * otherwise return 0.
381 xfs_check_nostate_extents(
386 for (; num > 0; num--, idx++) {
387 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
389 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
398 STATIC struct xfs_btree_cur *
400 struct xfs_btree_cur *cur)
402 struct xfs_btree_cur *new;
404 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
405 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
408 * Copy the firstblock, flist, and flags values,
409 * since init cursor doesn't get them.
411 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
412 new->bc_private.b.flist = cur->bc_private.b.flist;
413 new->bc_private.b.flags = cur->bc_private.b.flags;
419 xfs_bmbt_update_cursor(
420 struct xfs_btree_cur *src,
421 struct xfs_btree_cur *dst)
423 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
424 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
425 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
427 dst->bc_private.b.allocated += src->bc_private.b.allocated;
428 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
430 src->bc_private.b.allocated = 0;
434 xfs_bmbt_alloc_block(
435 struct xfs_btree_cur *cur,
436 union xfs_btree_ptr *start,
437 union xfs_btree_ptr *new,
440 xfs_alloc_arg_t args; /* block allocation args */
441 int error; /* error return value */
443 memset(&args, 0, sizeof(args));
444 args.tp = cur->bc_tp;
445 args.mp = cur->bc_mp;
446 args.fsbno = cur->bc_private.b.firstblock;
447 args.firstblock = args.fsbno;
449 if (args.fsbno == NULLFSBLOCK) {
450 args.fsbno = be64_to_cpu(start->l);
451 args.type = XFS_ALLOCTYPE_START_BNO;
453 * Make sure there is sufficient room left in the AG to
454 * complete a full tree split for an extent insert. If
455 * we are converting the middle part of an extent then
456 * we may need space for two tree splits.
458 * We are relying on the caller to make the correct block
459 * reservation for this operation to succeed. If the
460 * reservation amount is insufficient then we may fail a
461 * block allocation here and corrupt the filesystem.
463 args.minleft = xfs_trans_get_block_res(args.tp);
464 } else if (cur->bc_private.b.flist->xbf_low) {
465 args.type = XFS_ALLOCTYPE_START_BNO;
467 args.type = XFS_ALLOCTYPE_NEAR_BNO;
470 args.minlen = args.maxlen = args.prod = 1;
471 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
472 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
476 error = xfs_alloc_vextent(&args);
480 if (args.fsbno == NULLFSBLOCK && args.minleft) {
482 * Could not find an AG with enough free space to satisfy
483 * a full btree split. Try again without minleft and if
484 * successful activate the lowspace algorithm.
487 args.type = XFS_ALLOCTYPE_FIRST_AG;
489 error = xfs_alloc_vextent(&args);
492 cur->bc_private.b.flist->xbf_low = 1;
494 if (args.fsbno == NULLFSBLOCK) {
495 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
499 ASSERT(args.len == 1);
500 cur->bc_private.b.firstblock = args.fsbno;
501 cur->bc_private.b.allocated++;
502 cur->bc_private.b.ip->i_d.di_nblocks++;
503 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
504 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
505 XFS_TRANS_DQ_BCOUNT, 1L);
507 new->l = cpu_to_be64(args.fsbno);
509 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
514 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
520 struct xfs_btree_cur *cur,
523 struct xfs_mount *mp = cur->bc_mp;
524 struct xfs_inode *ip = cur->bc_private.b.ip;
525 struct xfs_trans *tp = cur->bc_tp;
526 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
528 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
529 ip->i_d.di_nblocks--;
531 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
532 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
533 xfs_trans_binval(tp, bp);
538 xfs_bmbt_get_minrecs(
539 struct xfs_btree_cur *cur,
542 if (level == cur->bc_nlevels - 1) {
543 struct xfs_ifork *ifp;
545 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
546 cur->bc_private.b.whichfork);
548 return xfs_bmbt_maxrecs(cur->bc_mp,
549 ifp->if_broot_bytes, level == 0) / 2;
552 return cur->bc_mp->m_bmap_dmnr[level != 0];
556 xfs_bmbt_get_maxrecs(
557 struct xfs_btree_cur *cur,
560 if (level == cur->bc_nlevels - 1) {
561 struct xfs_ifork *ifp;
563 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
564 cur->bc_private.b.whichfork);
566 return xfs_bmbt_maxrecs(cur->bc_mp,
567 ifp->if_broot_bytes, level == 0);
570 return cur->bc_mp->m_bmap_dmxr[level != 0];
575 * Get the maximum records we could store in the on-disk format.
577 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
578 * for the root node this checks the available space in the dinode fork
579 * so that we can resize the in-memory buffer to match it. After a
580 * resize to the maximum size this function returns the same value
581 * as xfs_bmbt_get_maxrecs for the root node, too.
584 xfs_bmbt_get_dmaxrecs(
585 struct xfs_btree_cur *cur,
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);
594 xfs_bmbt_init_key_from_rec(
595 union xfs_btree_key *key,
596 union xfs_btree_rec *rec)
598 key->bmbt.br_startoff =
599 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
603 xfs_bmbt_init_rec_from_key(
604 union xfs_btree_key *key,
605 union xfs_btree_rec *rec)
607 ASSERT(key->bmbt.br_startoff != 0);
609 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
614 xfs_bmbt_init_rec_from_cur(
615 struct xfs_btree_cur *cur,
616 union xfs_btree_rec *rec)
618 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
622 xfs_bmbt_init_ptr_from_cur(
623 struct xfs_btree_cur *cur,
624 union xfs_btree_ptr *ptr)
631 struct xfs_btree_cur *cur,
632 union xfs_btree_key *key)
634 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
635 cur->bc_rec.b.br_startoff;
642 struct xfs_mount *mp = bp->b_target->bt_mount;
643 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
646 switch (block->bb_magic) {
647 case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
648 if (!xfs_sb_version_hascrc(&mp->m_sb))
650 if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid))
652 if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
655 * XXX: need a better way of verifying the owner here. Right now
656 * just make sure there has been one set.
658 if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
661 case cpu_to_be32(XFS_BMAP_MAGIC):
668 * numrecs and level verification.
670 * We don't know what fork we belong to, so just verify that the level
671 * is less than the maximum of the two. Later checks will be more
674 level = be16_to_cpu(block->bb_level);
675 if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
677 if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
680 /* sibling pointer verification */
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))))
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))))
694 xfs_bmbt_read_verify(
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);
703 trace_xfs_btree_corrupt(bp, _RET_IP_);
704 xfs_verifier_error(bp);
709 xfs_bmbt_write_verify(
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);
718 xfs_btree_lblock_calc_crc(bp);
721 const struct xfs_buf_ops xfs_bmbt_buf_ops = {
722 .verify_read = xfs_bmbt_read_verify,
723 .verify_write = xfs_bmbt_write_verify,
727 #if defined(DEBUG) || defined(XFS_WARN)
729 xfs_bmbt_keys_inorder(
730 struct xfs_btree_cur *cur,
731 union xfs_btree_key *k1,
732 union xfs_btree_key *k2)
734 return be64_to_cpu(k1->bmbt.br_startoff) <
735 be64_to_cpu(k2->bmbt.br_startoff);
739 xfs_bmbt_recs_inorder(
740 struct xfs_btree_cur *cur,
741 union xfs_btree_rec *r1,
742 union xfs_btree_rec *r2)
744 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
745 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
746 xfs_bmbt_disk_get_startoff(&r2->bmbt);
750 static const struct xfs_btree_ops xfs_bmbt_ops = {
751 .rec_len = sizeof(xfs_bmbt_rec_t),
752 .key_len = sizeof(xfs_bmbt_key_t),
754 .dup_cursor = xfs_bmbt_dup_cursor,
755 .update_cursor = xfs_bmbt_update_cursor,
756 .alloc_block = xfs_bmbt_alloc_block,
757 .free_block = xfs_bmbt_free_block,
758 .get_maxrecs = xfs_bmbt_get_maxrecs,
759 .get_minrecs = xfs_bmbt_get_minrecs,
760 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
761 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
762 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
763 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
764 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
765 .key_diff = xfs_bmbt_key_diff,
766 .buf_ops = &xfs_bmbt_buf_ops,
767 #if defined(DEBUG) || defined(XFS_WARN)
768 .keys_inorder = xfs_bmbt_keys_inorder,
769 .recs_inorder = xfs_bmbt_recs_inorder,
774 * Allocate a new bmap btree cursor.
776 struct xfs_btree_cur * /* new bmap btree cursor */
777 xfs_bmbt_init_cursor(
778 struct xfs_mount *mp, /* file system mount point */
779 struct xfs_trans *tp, /* transaction pointer */
780 struct xfs_inode *ip, /* inode owning the btree */
781 int whichfork) /* data or attr fork */
783 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
784 struct xfs_btree_cur *cur;
786 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
790 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
791 cur->bc_btnum = XFS_BTNUM_BMAP;
792 cur->bc_blocklog = mp->m_sb.sb_blocklog;
794 cur->bc_ops = &xfs_bmbt_ops;
795 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
796 if (xfs_sb_version_hascrc(&mp->m_sb))
797 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
799 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
800 cur->bc_private.b.ip = ip;
801 cur->bc_private.b.firstblock = NULLFSBLOCK;
802 cur->bc_private.b.flist = NULL;
803 cur->bc_private.b.allocated = 0;
804 cur->bc_private.b.flags = 0;
805 cur->bc_private.b.whichfork = whichfork;
811 * Calculate number of records in a bmap btree block.
815 struct xfs_mount *mp,
819 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
822 return blocklen / sizeof(xfs_bmbt_rec_t);
823 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
827 * Calculate number of records in a bmap btree inode root.
834 blocklen -= sizeof(xfs_bmdr_block_t);
837 return blocklen / sizeof(xfs_bmdr_rec_t);
838 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
842 * Change the owner of a btree format fork fo the inode passed in. Change it to
843 * the owner of that is passed in so that we can change owners before or after
844 * we switch forks between inodes. The operation that the caller is doing will
845 * determine whether is needs to change owner before or after the switch.
847 * For demand paged transactional modification, the fork switch should be done
848 * after reading in all the blocks, modifying them and pinning them in the
849 * transaction. For modification when the buffers are already pinned in memory,
850 * the fork switch can be done before changing the owner as we won't need to
851 * validate the owner until the btree buffers are unpinned and writes can occur
854 * For recovery based ownership change, there is no transactional context and
855 * so a buffer list must be supplied so that we can record the buffers that we
856 * modified for the caller to issue IO on.
859 xfs_bmbt_change_owner(
860 struct xfs_trans *tp,
861 struct xfs_inode *ip,
864 struct list_head *buffer_list)
866 struct xfs_btree_cur *cur;
869 ASSERT(tp || buffer_list);
870 ASSERT(!(tp && buffer_list));
871 if (whichfork == XFS_DATA_FORK)
872 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
874 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
876 cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
880 error = xfs_btree_change_owner(cur, new_owner, buffer_list);
881 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);