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_defer.h"
27 #include "xfs_inode.h"
28 #include "xfs_trans.h"
29 #include "xfs_inode_item.h"
30 #include "xfs_alloc.h"
31 #include "xfs_btree.h"
32 #include "xfs_bmap_btree.h"
34 #include "xfs_error.h"
35 #include "xfs_quota.h"
36 #include "xfs_trace.h"
37 #include "xfs_cksum.h"
41 * Determine the extent state.
50 ASSERT(blks != 0); /* saved for DMIG */
51 return XFS_EXT_UNWRITTEN;
57 * Convert on-disk form of btree root to in-memory form.
62 xfs_bmdr_block_t *dblock,
64 struct xfs_btree_block *rblock,
67 struct xfs_mount *mp = ip->i_mount;
74 if (xfs_sb_version_hascrc(&mp->m_sb))
75 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
76 XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
77 XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
79 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
80 XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
83 rblock->bb_level = dblock->bb_level;
84 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
85 rblock->bb_numrecs = dblock->bb_numrecs;
86 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
87 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
88 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
89 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
90 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
91 dmxr = be16_to_cpu(dblock->bb_numrecs);
92 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
93 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
97 * Convert a compressed bmap extent record to an uncompressed form.
98 * This code must be in sync with the routines xfs_bmbt_get_startoff,
99 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
110 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
111 s->br_startoff = ((xfs_fileoff_t)l0 &
112 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
113 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
114 (((xfs_fsblock_t)l1) >> 21);
115 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
116 /* This is xfs_extent_state() in-line */
118 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
119 st = XFS_EXT_UNWRITTEN;
127 xfs_bmbt_rec_host_t *r,
130 __xfs_bmbt_get_all(r->l0, r->l1, s);
134 * Extract the blockcount field from an in memory bmap extent record.
137 xfs_bmbt_get_blockcount(
138 xfs_bmbt_rec_host_t *r)
140 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
144 * Extract the startblock field from an in memory bmap extent record.
147 xfs_bmbt_get_startblock(
148 xfs_bmbt_rec_host_t *r)
150 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
151 (((xfs_fsblock_t)r->l1) >> 21);
155 * Extract the startoff field from an in memory bmap extent record.
158 xfs_bmbt_get_startoff(
159 xfs_bmbt_rec_host_t *r)
161 return ((xfs_fileoff_t)r->l0 &
162 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
167 xfs_bmbt_rec_host_t *r)
171 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
172 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
177 * Extract the blockcount field from an on disk bmap extent record.
180 xfs_bmbt_disk_get_blockcount(
183 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
187 * Extract the startoff field from a disk format bmap extent record.
190 xfs_bmbt_disk_get_startoff(
193 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
194 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
199 * Set all the fields in a bmap extent record from the arguments.
203 xfs_bmbt_rec_host_t *r,
204 xfs_fileoff_t startoff,
205 xfs_fsblock_t startblock,
206 xfs_filblks_t blockcount,
209 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
211 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
212 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
213 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
215 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
217 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
218 ((xfs_bmbt_rec_base_t)startoff << 9) |
219 ((xfs_bmbt_rec_base_t)startblock >> 43);
220 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
221 ((xfs_bmbt_rec_base_t)blockcount &
222 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
226 * Set all the fields in a bmap extent record from the uncompressed form.
230 xfs_bmbt_rec_host_t *r,
233 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
234 s->br_blockcount, s->br_state);
239 * Set all the fields in a disk format bmap extent record from the arguments.
242 xfs_bmbt_disk_set_allf(
244 xfs_fileoff_t startoff,
245 xfs_fsblock_t startblock,
246 xfs_filblks_t blockcount,
249 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
251 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
252 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
253 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
254 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
257 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
258 ((xfs_bmbt_rec_base_t)startoff << 9) |
259 ((xfs_bmbt_rec_base_t)startblock >> 43));
261 ((xfs_bmbt_rec_base_t)startblock << 21) |
262 ((xfs_bmbt_rec_base_t)blockcount &
263 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
267 * Set all the fields in a bmap extent record from the uncompressed form.
270 xfs_bmbt_disk_set_all(
274 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
275 s->br_blockcount, s->br_state);
279 * Set the blockcount field in a bmap extent record.
282 xfs_bmbt_set_blockcount(
283 xfs_bmbt_rec_host_t *r,
286 ASSERT((v & xfs_mask64hi(43)) == 0);
287 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
288 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
292 * Set the startblock field in a bmap extent record.
295 xfs_bmbt_set_startblock(
296 xfs_bmbt_rec_host_t *r,
299 ASSERT((v & xfs_mask64hi(12)) == 0);
300 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
301 (xfs_bmbt_rec_base_t)(v >> 43);
302 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
303 (xfs_bmbt_rec_base_t)(v << 21);
307 * Set the startoff field in a bmap extent record.
310 xfs_bmbt_set_startoff(
311 xfs_bmbt_rec_host_t *r,
314 ASSERT((v & xfs_mask64hi(9)) == 0);
315 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
316 ((xfs_bmbt_rec_base_t)v << 9) |
317 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
321 * Set the extent state field in a bmap extent record.
325 xfs_bmbt_rec_host_t *r,
328 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
329 if (v == XFS_EXT_NORM)
330 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
332 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
336 * Convert in-memory form of btree root to on-disk form.
340 struct xfs_mount *mp,
341 struct xfs_btree_block *rblock,
343 xfs_bmdr_block_t *dblock,
352 if (xfs_sb_version_hascrc(&mp->m_sb)) {
353 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
354 ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid,
355 &mp->m_sb.sb_meta_uuid));
356 ASSERT(rblock->bb_u.l.bb_blkno ==
357 cpu_to_be64(XFS_BUF_DADDR_NULL));
359 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
360 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLFSBLOCK));
361 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK));
362 ASSERT(rblock->bb_level != 0);
363 dblock->bb_level = rblock->bb_level;
364 dblock->bb_numrecs = rblock->bb_numrecs;
365 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
366 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
367 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
368 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
369 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
370 dmxr = be16_to_cpu(dblock->bb_numrecs);
371 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
372 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
376 * Check extent records, which have just been read, for
377 * any bit in the extent flag field. ASSERT on debug
378 * kernels, as this condition should not occur.
379 * Return an error condition (1) if any flags found,
380 * otherwise return 0.
384 xfs_check_nostate_extents(
389 for (; num > 0; num--, idx++) {
390 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
392 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
401 STATIC struct xfs_btree_cur *
403 struct xfs_btree_cur *cur)
405 struct xfs_btree_cur *new;
407 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
408 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
411 * Copy the firstblock, dfops, and flags values,
412 * since init cursor doesn't get them.
414 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
415 new->bc_private.b.dfops = cur->bc_private.b.dfops;
416 new->bc_private.b.flags = cur->bc_private.b.flags;
422 xfs_bmbt_update_cursor(
423 struct xfs_btree_cur *src,
424 struct xfs_btree_cur *dst)
426 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
427 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
428 ASSERT(dst->bc_private.b.dfops == src->bc_private.b.dfops);
430 dst->bc_private.b.allocated += src->bc_private.b.allocated;
431 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
433 src->bc_private.b.allocated = 0;
437 xfs_bmbt_alloc_block(
438 struct xfs_btree_cur *cur,
439 union xfs_btree_ptr *start,
440 union xfs_btree_ptr *new,
443 xfs_alloc_arg_t args; /* block allocation args */
444 int error; /* error return value */
446 memset(&args, 0, sizeof(args));
447 args.tp = cur->bc_tp;
448 args.mp = cur->bc_mp;
449 args.fsbno = cur->bc_private.b.firstblock;
450 args.firstblock = args.fsbno;
451 xfs_rmap_ino_bmbt_owner(&args.oinfo, cur->bc_private.b.ip->i_ino,
452 cur->bc_private.b.whichfork);
454 if (args.fsbno == NULLFSBLOCK) {
455 args.fsbno = be64_to_cpu(start->l);
456 args.type = XFS_ALLOCTYPE_START_BNO;
458 * Make sure there is sufficient room left in the AG to
459 * complete a full tree split for an extent insert. If
460 * we are converting the middle part of an extent then
461 * we may need space for two tree splits.
463 * We are relying on the caller to make the correct block
464 * reservation for this operation to succeed. If the
465 * reservation amount is insufficient then we may fail a
466 * block allocation here and corrupt the filesystem.
468 args.minleft = args.tp->t_blk_res;
469 } else if (cur->bc_private.b.dfops->dop_low) {
470 args.type = XFS_ALLOCTYPE_START_BNO;
472 args.type = XFS_ALLOCTYPE_NEAR_BNO;
475 args.minlen = args.maxlen = args.prod = 1;
476 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
477 if (!args.wasdel && args.tp->t_blk_res == 0) {
481 error = xfs_alloc_vextent(&args);
485 if (args.fsbno == NULLFSBLOCK && args.minleft) {
487 * Could not find an AG with enough free space to satisfy
488 * a full btree split. Try again without minleft and if
489 * successful activate the lowspace algorithm.
492 args.type = XFS_ALLOCTYPE_FIRST_AG;
494 error = xfs_alloc_vextent(&args);
497 cur->bc_private.b.dfops->dop_low = true;
499 if (args.fsbno == NULLFSBLOCK) {
500 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
504 ASSERT(args.len == 1);
505 cur->bc_private.b.firstblock = args.fsbno;
506 cur->bc_private.b.allocated++;
507 cur->bc_private.b.ip->i_d.di_nblocks++;
508 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
509 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
510 XFS_TRANS_DQ_BCOUNT, 1L);
512 new->l = cpu_to_be64(args.fsbno);
514 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
519 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
525 struct xfs_btree_cur *cur,
528 struct xfs_mount *mp = cur->bc_mp;
529 struct xfs_inode *ip = cur->bc_private.b.ip;
530 struct xfs_trans *tp = cur->bc_tp;
531 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
532 struct xfs_owner_info oinfo;
534 xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, cur->bc_private.b.whichfork);
535 xfs_bmap_add_free(mp, cur->bc_private.b.dfops, fsbno, 1, &oinfo);
536 ip->i_d.di_nblocks--;
538 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
539 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
544 xfs_bmbt_get_minrecs(
545 struct xfs_btree_cur *cur,
548 if (level == cur->bc_nlevels - 1) {
549 struct xfs_ifork *ifp;
551 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
552 cur->bc_private.b.whichfork);
554 return xfs_bmbt_maxrecs(cur->bc_mp,
555 ifp->if_broot_bytes, level == 0) / 2;
558 return cur->bc_mp->m_bmap_dmnr[level != 0];
562 xfs_bmbt_get_maxrecs(
563 struct xfs_btree_cur *cur,
566 if (level == cur->bc_nlevels - 1) {
567 struct xfs_ifork *ifp;
569 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
570 cur->bc_private.b.whichfork);
572 return xfs_bmbt_maxrecs(cur->bc_mp,
573 ifp->if_broot_bytes, level == 0);
576 return cur->bc_mp->m_bmap_dmxr[level != 0];
581 * Get the maximum records we could store in the on-disk format.
583 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
584 * for the root node this checks the available space in the dinode fork
585 * so that we can resize the in-memory buffer to match it. After a
586 * resize to the maximum size this function returns the same value
587 * as xfs_bmbt_get_maxrecs for the root node, too.
590 xfs_bmbt_get_dmaxrecs(
591 struct xfs_btree_cur *cur,
594 if (level != cur->bc_nlevels - 1)
595 return cur->bc_mp->m_bmap_dmxr[level != 0];
596 return xfs_bmdr_maxrecs(cur->bc_private.b.forksize, level == 0);
600 xfs_bmbt_init_key_from_rec(
601 union xfs_btree_key *key,
602 union xfs_btree_rec *rec)
604 key->bmbt.br_startoff =
605 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
609 xfs_bmbt_init_rec_from_cur(
610 struct xfs_btree_cur *cur,
611 union xfs_btree_rec *rec)
613 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
617 xfs_bmbt_init_ptr_from_cur(
618 struct xfs_btree_cur *cur,
619 union xfs_btree_ptr *ptr)
626 struct xfs_btree_cur *cur,
627 union xfs_btree_key *key)
629 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
630 cur->bc_rec.b.br_startoff;
637 struct xfs_mount *mp = bp->b_target->bt_mount;
638 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
641 switch (block->bb_magic) {
642 case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
643 if (!xfs_sb_version_hascrc(&mp->m_sb))
645 if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
647 if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
650 * XXX: need a better way of verifying the owner here. Right now
651 * just make sure there has been one set.
653 if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
656 case cpu_to_be32(XFS_BMAP_MAGIC):
663 * numrecs and level verification.
665 * We don't know what fork we belong to, so just verify that the level
666 * is less than the maximum of the two. Later checks will be more
669 level = be16_to_cpu(block->bb_level);
670 if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
672 if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
675 /* sibling pointer verification */
676 if (!block->bb_u.l.bb_leftsib ||
677 (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
678 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
680 if (!block->bb_u.l.bb_rightsib ||
681 (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
682 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
689 xfs_bmbt_read_verify(
692 if (!xfs_btree_lblock_verify_crc(bp))
693 xfs_buf_ioerror(bp, -EFSBADCRC);
694 else if (!xfs_bmbt_verify(bp))
695 xfs_buf_ioerror(bp, -EFSCORRUPTED);
698 trace_xfs_btree_corrupt(bp, _RET_IP_);
699 xfs_verifier_error(bp);
704 xfs_bmbt_write_verify(
707 if (!xfs_bmbt_verify(bp)) {
708 trace_xfs_btree_corrupt(bp, _RET_IP_);
709 xfs_buf_ioerror(bp, -EFSCORRUPTED);
710 xfs_verifier_error(bp);
713 xfs_btree_lblock_calc_crc(bp);
716 const struct xfs_buf_ops xfs_bmbt_buf_ops = {
718 .verify_read = xfs_bmbt_read_verify,
719 .verify_write = xfs_bmbt_write_verify,
723 #if defined(DEBUG) || defined(XFS_WARN)
725 xfs_bmbt_keys_inorder(
726 struct xfs_btree_cur *cur,
727 union xfs_btree_key *k1,
728 union xfs_btree_key *k2)
730 return be64_to_cpu(k1->bmbt.br_startoff) <
731 be64_to_cpu(k2->bmbt.br_startoff);
735 xfs_bmbt_recs_inorder(
736 struct xfs_btree_cur *cur,
737 union xfs_btree_rec *r1,
738 union xfs_btree_rec *r2)
740 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
741 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
742 xfs_bmbt_disk_get_startoff(&r2->bmbt);
746 static const struct xfs_btree_ops xfs_bmbt_ops = {
747 .rec_len = sizeof(xfs_bmbt_rec_t),
748 .key_len = sizeof(xfs_bmbt_key_t),
750 .dup_cursor = xfs_bmbt_dup_cursor,
751 .update_cursor = xfs_bmbt_update_cursor,
752 .alloc_block = xfs_bmbt_alloc_block,
753 .free_block = xfs_bmbt_free_block,
754 .get_maxrecs = xfs_bmbt_get_maxrecs,
755 .get_minrecs = xfs_bmbt_get_minrecs,
756 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
757 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
758 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
759 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
760 .key_diff = xfs_bmbt_key_diff,
761 .buf_ops = &xfs_bmbt_buf_ops,
762 #if defined(DEBUG) || defined(XFS_WARN)
763 .keys_inorder = xfs_bmbt_keys_inorder,
764 .recs_inorder = xfs_bmbt_recs_inorder,
769 * Allocate a new bmap btree cursor.
771 struct xfs_btree_cur * /* new bmap btree cursor */
772 xfs_bmbt_init_cursor(
773 struct xfs_mount *mp, /* file system mount point */
774 struct xfs_trans *tp, /* transaction pointer */
775 struct xfs_inode *ip, /* inode owning the btree */
776 int whichfork) /* data or attr fork */
778 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
779 struct xfs_btree_cur *cur;
781 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
785 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
786 cur->bc_btnum = XFS_BTNUM_BMAP;
787 cur->bc_blocklog = mp->m_sb.sb_blocklog;
789 cur->bc_ops = &xfs_bmbt_ops;
790 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
791 if (xfs_sb_version_hascrc(&mp->m_sb))
792 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
794 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
795 cur->bc_private.b.ip = ip;
796 cur->bc_private.b.firstblock = NULLFSBLOCK;
797 cur->bc_private.b.dfops = NULL;
798 cur->bc_private.b.allocated = 0;
799 cur->bc_private.b.flags = 0;
800 cur->bc_private.b.whichfork = whichfork;
806 * Calculate number of records in a bmap btree block.
810 struct xfs_mount *mp,
814 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
817 return blocklen / sizeof(xfs_bmbt_rec_t);
818 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
822 * Calculate number of records in a bmap btree inode root.
829 blocklen -= sizeof(xfs_bmdr_block_t);
832 return blocklen / sizeof(xfs_bmdr_rec_t);
833 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
837 * Change the owner of a btree format fork fo the inode passed in. Change it to
838 * the owner of that is passed in so that we can change owners before or after
839 * we switch forks between inodes. The operation that the caller is doing will
840 * determine whether is needs to change owner before or after the switch.
842 * For demand paged transactional modification, the fork switch should be done
843 * after reading in all the blocks, modifying them and pinning them in the
844 * transaction. For modification when the buffers are already pinned in memory,
845 * the fork switch can be done before changing the owner as we won't need to
846 * validate the owner until the btree buffers are unpinned and writes can occur
849 * For recovery based ownership change, there is no transactional context and
850 * so a buffer list must be supplied so that we can record the buffers that we
851 * modified for the caller to issue IO on.
854 xfs_bmbt_change_owner(
855 struct xfs_trans *tp,
856 struct xfs_inode *ip,
859 struct list_head *buffer_list)
861 struct xfs_btree_cur *cur;
864 ASSERT(tp || buffer_list);
865 ASSERT(!(tp && buffer_list));
866 if (whichfork == XFS_DATA_FORK)
867 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
869 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
871 cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
875 error = xfs_btree_change_owner(cur, new_owner, buffer_list);
876 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);