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"
40 * Determine the extent state.
49 ASSERT(blks != 0); /* saved for DMIG */
50 return XFS_EXT_UNWRITTEN;
56 * Convert on-disk form of btree root to in-memory form.
61 xfs_bmdr_block_t *dblock,
63 struct xfs_btree_block *rblock,
66 struct xfs_mount *mp = ip->i_mount;
73 if (xfs_sb_version_hascrc(&mp->m_sb))
74 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
75 XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
76 XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
78 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
79 XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
82 rblock->bb_level = dblock->bb_level;
83 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
84 rblock->bb_numrecs = dblock->bb_numrecs;
85 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
86 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
87 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
88 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
89 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
90 dmxr = be16_to_cpu(dblock->bb_numrecs);
91 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
92 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
96 * Convert a compressed bmap extent record to an uncompressed form.
97 * This code must be in sync with the routines xfs_bmbt_get_startoff,
98 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
109 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
110 s->br_startoff = ((xfs_fileoff_t)l0 &
111 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
112 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
113 (((xfs_fsblock_t)l1) >> 21);
114 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
115 /* This is xfs_extent_state() in-line */
117 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
118 st = XFS_EXT_UNWRITTEN;
126 xfs_bmbt_rec_host_t *r,
129 __xfs_bmbt_get_all(r->l0, r->l1, s);
133 * Extract the blockcount field from an in memory bmap extent record.
136 xfs_bmbt_get_blockcount(
137 xfs_bmbt_rec_host_t *r)
139 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
143 * Extract the startblock field from an in memory bmap extent record.
146 xfs_bmbt_get_startblock(
147 xfs_bmbt_rec_host_t *r)
149 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
150 (((xfs_fsblock_t)r->l1) >> 21);
154 * Extract the startoff field from an in memory bmap extent record.
157 xfs_bmbt_get_startoff(
158 xfs_bmbt_rec_host_t *r)
160 return ((xfs_fileoff_t)r->l0 &
161 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
166 xfs_bmbt_rec_host_t *r)
170 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
171 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
176 * Extract the blockcount field from an on disk bmap extent record.
179 xfs_bmbt_disk_get_blockcount(
182 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
186 * Extract the startoff field from a disk format bmap extent record.
189 xfs_bmbt_disk_get_startoff(
192 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
193 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
198 * Set all the fields in a bmap extent record from the arguments.
202 xfs_bmbt_rec_host_t *r,
203 xfs_fileoff_t startoff,
204 xfs_fsblock_t startblock,
205 xfs_filblks_t blockcount,
208 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
210 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
211 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
212 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
214 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
216 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
217 ((xfs_bmbt_rec_base_t)startoff << 9) |
218 ((xfs_bmbt_rec_base_t)startblock >> 43);
219 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
220 ((xfs_bmbt_rec_base_t)blockcount &
221 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
225 * Set all the fields in a bmap extent record from the uncompressed form.
229 xfs_bmbt_rec_host_t *r,
232 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
233 s->br_blockcount, s->br_state);
238 * Set all the fields in a disk format bmap extent record from the arguments.
241 xfs_bmbt_disk_set_allf(
243 xfs_fileoff_t startoff,
244 xfs_fsblock_t startblock,
245 xfs_filblks_t blockcount,
248 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
250 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
251 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
252 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
253 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
256 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
257 ((xfs_bmbt_rec_base_t)startoff << 9) |
258 ((xfs_bmbt_rec_base_t)startblock >> 43));
260 ((xfs_bmbt_rec_base_t)startblock << 21) |
261 ((xfs_bmbt_rec_base_t)blockcount &
262 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
266 * Set all the fields in a bmap extent record from the uncompressed form.
269 xfs_bmbt_disk_set_all(
273 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
274 s->br_blockcount, s->br_state);
278 * Set the blockcount field in a bmap extent record.
281 xfs_bmbt_set_blockcount(
282 xfs_bmbt_rec_host_t *r,
285 ASSERT((v & xfs_mask64hi(43)) == 0);
286 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
287 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
291 * Set the startblock field in a bmap extent record.
294 xfs_bmbt_set_startblock(
295 xfs_bmbt_rec_host_t *r,
298 ASSERT((v & xfs_mask64hi(12)) == 0);
299 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
300 (xfs_bmbt_rec_base_t)(v >> 43);
301 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
302 (xfs_bmbt_rec_base_t)(v << 21);
306 * Set the startoff field in a bmap extent record.
309 xfs_bmbt_set_startoff(
310 xfs_bmbt_rec_host_t *r,
313 ASSERT((v & xfs_mask64hi(9)) == 0);
314 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
315 ((xfs_bmbt_rec_base_t)v << 9) |
316 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
320 * Set the extent state field in a bmap extent record.
324 xfs_bmbt_rec_host_t *r,
327 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
328 if (v == XFS_EXT_NORM)
329 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
331 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
335 * Convert in-memory form of btree root to on-disk form.
339 struct xfs_mount *mp,
340 struct xfs_btree_block *rblock,
342 xfs_bmdr_block_t *dblock,
351 if (xfs_sb_version_hascrc(&mp->m_sb)) {
352 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
353 ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid,
354 &mp->m_sb.sb_meta_uuid));
355 ASSERT(rblock->bb_u.l.bb_blkno ==
356 cpu_to_be64(XFS_BUF_DADDR_NULL));
358 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
359 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLFSBLOCK));
360 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK));
361 ASSERT(rblock->bb_level != 0);
362 dblock->bb_level = rblock->bb_level;
363 dblock->bb_numrecs = rblock->bb_numrecs;
364 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
365 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
366 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
367 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
368 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
369 dmxr = be16_to_cpu(dblock->bb_numrecs);
370 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
371 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
375 * Check extent records, which have just been read, for
376 * any bit in the extent flag field. ASSERT on debug
377 * kernels, as this condition should not occur.
378 * Return an error condition (1) if any flags found,
379 * otherwise return 0.
383 xfs_check_nostate_extents(
388 for (; num > 0; num--, idx++) {
389 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
391 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
400 STATIC struct xfs_btree_cur *
402 struct xfs_btree_cur *cur)
404 struct xfs_btree_cur *new;
406 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
407 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
410 * Copy the firstblock, dfops, and flags values,
411 * since init cursor doesn't get them.
413 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
414 new->bc_private.b.dfops = cur->bc_private.b.dfops;
415 new->bc_private.b.flags = cur->bc_private.b.flags;
421 xfs_bmbt_update_cursor(
422 struct xfs_btree_cur *src,
423 struct xfs_btree_cur *dst)
425 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
426 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
427 ASSERT(dst->bc_private.b.dfops == src->bc_private.b.dfops);
429 dst->bc_private.b.allocated += src->bc_private.b.allocated;
430 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
432 src->bc_private.b.allocated = 0;
436 xfs_bmbt_alloc_block(
437 struct xfs_btree_cur *cur,
438 union xfs_btree_ptr *start,
439 union xfs_btree_ptr *new,
442 xfs_alloc_arg_t args; /* block allocation args */
443 int error; /* error return value */
445 memset(&args, 0, sizeof(args));
446 args.tp = cur->bc_tp;
447 args.mp = cur->bc_mp;
448 args.fsbno = cur->bc_private.b.firstblock;
449 args.firstblock = args.fsbno;
451 if (args.fsbno == NULLFSBLOCK) {
452 args.fsbno = be64_to_cpu(start->l);
453 args.type = XFS_ALLOCTYPE_START_BNO;
455 * Make sure there is sufficient room left in the AG to
456 * complete a full tree split for an extent insert. If
457 * we are converting the middle part of an extent then
458 * we may need space for two tree splits.
460 * We are relying on the caller to make the correct block
461 * reservation for this operation to succeed. If the
462 * reservation amount is insufficient then we may fail a
463 * block allocation here and corrupt the filesystem.
465 args.minleft = args.tp->t_blk_res;
466 } else if (cur->bc_private.b.dfops->dop_low) {
467 args.type = XFS_ALLOCTYPE_START_BNO;
469 args.type = XFS_ALLOCTYPE_NEAR_BNO;
472 args.minlen = args.maxlen = args.prod = 1;
473 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
474 if (!args.wasdel && args.tp->t_blk_res == 0) {
478 error = xfs_alloc_vextent(&args);
482 if (args.fsbno == NULLFSBLOCK && args.minleft) {
484 * Could not find an AG with enough free space to satisfy
485 * a full btree split. Try again without minleft and if
486 * successful activate the lowspace algorithm.
489 args.type = XFS_ALLOCTYPE_FIRST_AG;
491 error = xfs_alloc_vextent(&args);
494 cur->bc_private.b.dfops->dop_low = true;
496 if (args.fsbno == NULLFSBLOCK) {
497 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
501 ASSERT(args.len == 1);
502 cur->bc_private.b.firstblock = args.fsbno;
503 cur->bc_private.b.allocated++;
504 cur->bc_private.b.ip->i_d.di_nblocks++;
505 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
506 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
507 XFS_TRANS_DQ_BCOUNT, 1L);
509 new->l = cpu_to_be64(args.fsbno);
511 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
516 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
522 struct xfs_btree_cur *cur,
525 struct xfs_mount *mp = cur->bc_mp;
526 struct xfs_inode *ip = cur->bc_private.b.ip;
527 struct xfs_trans *tp = cur->bc_tp;
528 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
530 xfs_bmap_add_free(mp, cur->bc_private.b.dfops, fsbno, 1);
531 ip->i_d.di_nblocks--;
533 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
534 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
539 xfs_bmbt_get_minrecs(
540 struct xfs_btree_cur *cur,
543 if (level == cur->bc_nlevels - 1) {
544 struct xfs_ifork *ifp;
546 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
547 cur->bc_private.b.whichfork);
549 return xfs_bmbt_maxrecs(cur->bc_mp,
550 ifp->if_broot_bytes, level == 0) / 2;
553 return cur->bc_mp->m_bmap_dmnr[level != 0];
557 xfs_bmbt_get_maxrecs(
558 struct xfs_btree_cur *cur,
561 if (level == cur->bc_nlevels - 1) {
562 struct xfs_ifork *ifp;
564 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
565 cur->bc_private.b.whichfork);
567 return xfs_bmbt_maxrecs(cur->bc_mp,
568 ifp->if_broot_bytes, level == 0);
571 return cur->bc_mp->m_bmap_dmxr[level != 0];
576 * Get the maximum records we could store in the on-disk format.
578 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
579 * for the root node this checks the available space in the dinode fork
580 * so that we can resize the in-memory buffer to match it. After a
581 * resize to the maximum size this function returns the same value
582 * as xfs_bmbt_get_maxrecs for the root node, too.
585 xfs_bmbt_get_dmaxrecs(
586 struct xfs_btree_cur *cur,
589 if (level != cur->bc_nlevels - 1)
590 return cur->bc_mp->m_bmap_dmxr[level != 0];
591 return xfs_bmdr_maxrecs(cur->bc_private.b.forksize, level == 0);
595 xfs_bmbt_init_key_from_rec(
596 union xfs_btree_key *key,
597 union xfs_btree_rec *rec)
599 key->bmbt.br_startoff =
600 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
604 xfs_bmbt_init_rec_from_cur(
605 struct xfs_btree_cur *cur,
606 union xfs_btree_rec *rec)
608 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
612 xfs_bmbt_init_ptr_from_cur(
613 struct xfs_btree_cur *cur,
614 union xfs_btree_ptr *ptr)
621 struct xfs_btree_cur *cur,
622 union xfs_btree_key *key)
624 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
625 cur->bc_rec.b.br_startoff;
632 struct xfs_mount *mp = bp->b_target->bt_mount;
633 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
636 switch (block->bb_magic) {
637 case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
638 if (!xfs_sb_version_hascrc(&mp->m_sb))
640 if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
642 if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
645 * XXX: need a better way of verifying the owner here. Right now
646 * just make sure there has been one set.
648 if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
651 case cpu_to_be32(XFS_BMAP_MAGIC):
658 * numrecs and level verification.
660 * We don't know what fork we belong to, so just verify that the level
661 * is less than the maximum of the two. Later checks will be more
664 level = be16_to_cpu(block->bb_level);
665 if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
667 if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
670 /* sibling pointer verification */
671 if (!block->bb_u.l.bb_leftsib ||
672 (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
673 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
675 if (!block->bb_u.l.bb_rightsib ||
676 (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
677 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
684 xfs_bmbt_read_verify(
687 if (!xfs_btree_lblock_verify_crc(bp))
688 xfs_buf_ioerror(bp, -EFSBADCRC);
689 else if (!xfs_bmbt_verify(bp))
690 xfs_buf_ioerror(bp, -EFSCORRUPTED);
693 trace_xfs_btree_corrupt(bp, _RET_IP_);
694 xfs_verifier_error(bp);
699 xfs_bmbt_write_verify(
702 if (!xfs_bmbt_verify(bp)) {
703 trace_xfs_btree_corrupt(bp, _RET_IP_);
704 xfs_buf_ioerror(bp, -EFSCORRUPTED);
705 xfs_verifier_error(bp);
708 xfs_btree_lblock_calc_crc(bp);
711 const struct xfs_buf_ops xfs_bmbt_buf_ops = {
713 .verify_read = xfs_bmbt_read_verify,
714 .verify_write = xfs_bmbt_write_verify,
718 #if defined(DEBUG) || defined(XFS_WARN)
720 xfs_bmbt_keys_inorder(
721 struct xfs_btree_cur *cur,
722 union xfs_btree_key *k1,
723 union xfs_btree_key *k2)
725 return be64_to_cpu(k1->bmbt.br_startoff) <
726 be64_to_cpu(k2->bmbt.br_startoff);
730 xfs_bmbt_recs_inorder(
731 struct xfs_btree_cur *cur,
732 union xfs_btree_rec *r1,
733 union xfs_btree_rec *r2)
735 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
736 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
737 xfs_bmbt_disk_get_startoff(&r2->bmbt);
741 static const struct xfs_btree_ops xfs_bmbt_ops = {
742 .rec_len = sizeof(xfs_bmbt_rec_t),
743 .key_len = sizeof(xfs_bmbt_key_t),
745 .dup_cursor = xfs_bmbt_dup_cursor,
746 .update_cursor = xfs_bmbt_update_cursor,
747 .alloc_block = xfs_bmbt_alloc_block,
748 .free_block = xfs_bmbt_free_block,
749 .get_maxrecs = xfs_bmbt_get_maxrecs,
750 .get_minrecs = xfs_bmbt_get_minrecs,
751 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
752 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
753 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
754 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
755 .key_diff = xfs_bmbt_key_diff,
756 .buf_ops = &xfs_bmbt_buf_ops,
757 #if defined(DEBUG) || defined(XFS_WARN)
758 .keys_inorder = xfs_bmbt_keys_inorder,
759 .recs_inorder = xfs_bmbt_recs_inorder,
762 .get_leaf_keys = xfs_btree_get_leaf_keys,
763 .get_node_keys = xfs_btree_get_node_keys,
764 .update_keys = xfs_btree_update_keys,
768 * Allocate a new bmap btree cursor.
770 struct xfs_btree_cur * /* new bmap btree cursor */
771 xfs_bmbt_init_cursor(
772 struct xfs_mount *mp, /* file system mount point */
773 struct xfs_trans *tp, /* transaction pointer */
774 struct xfs_inode *ip, /* inode owning the btree */
775 int whichfork) /* data or attr fork */
777 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
778 struct xfs_btree_cur *cur;
780 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
784 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
785 cur->bc_btnum = XFS_BTNUM_BMAP;
786 cur->bc_blocklog = mp->m_sb.sb_blocklog;
788 cur->bc_ops = &xfs_bmbt_ops;
789 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
790 if (xfs_sb_version_hascrc(&mp->m_sb))
791 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
793 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
794 cur->bc_private.b.ip = ip;
795 cur->bc_private.b.firstblock = NULLFSBLOCK;
796 cur->bc_private.b.dfops = NULL;
797 cur->bc_private.b.allocated = 0;
798 cur->bc_private.b.flags = 0;
799 cur->bc_private.b.whichfork = whichfork;
805 * Calculate number of records in a bmap btree block.
809 struct xfs_mount *mp,
813 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
816 return blocklen / sizeof(xfs_bmbt_rec_t);
817 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
821 * Calculate number of records in a bmap btree inode root.
828 blocklen -= sizeof(xfs_bmdr_block_t);
831 return blocklen / sizeof(xfs_bmdr_rec_t);
832 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
836 * Change the owner of a btree format fork fo the inode passed in. Change it to
837 * the owner of that is passed in so that we can change owners before or after
838 * we switch forks between inodes. The operation that the caller is doing will
839 * determine whether is needs to change owner before or after the switch.
841 * For demand paged transactional modification, the fork switch should be done
842 * after reading in all the blocks, modifying them and pinning them in the
843 * transaction. For modification when the buffers are already pinned in memory,
844 * the fork switch can be done before changing the owner as we won't need to
845 * validate the owner until the btree buffers are unpinned and writes can occur
848 * For recovery based ownership change, there is no transactional context and
849 * so a buffer list must be supplied so that we can record the buffers that we
850 * modified for the caller to issue IO on.
853 xfs_bmbt_change_owner(
854 struct xfs_trans *tp,
855 struct xfs_inode *ip,
858 struct list_head *buffer_list)
860 struct xfs_btree_cur *cur;
863 ASSERT(tp || buffer_list);
864 ASSERT(!(tp && buffer_list));
865 if (whichfork == XFS_DATA_FORK)
866 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
868 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
870 cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
874 error = xfs_btree_change_owner(cur, new_owner, buffer_list);
875 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);