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"
27 #include "xfs_mount.h"
28 #include "xfs_inode.h"
29 #include "xfs_trans.h"
30 #include "xfs_inode_item.h"
31 #include "xfs_alloc.h"
32 #include "xfs_btree.h"
33 #include "xfs_bmap_btree.h"
35 #include "xfs_error.h"
36 #include "xfs_quota.h"
37 #include "xfs_trace.h"
38 #include "xfs_cksum.h"
39 #include "xfs_dinode.h"
42 * Determine the extent state.
51 ASSERT(blks != 0); /* saved for DMIG */
52 return XFS_EXT_UNWRITTEN;
58 * Convert on-disk form of btree root to in-memory form.
63 xfs_bmdr_block_t *dblock,
65 struct xfs_btree_block *rblock,
68 struct xfs_mount *mp = ip->i_mount;
75 if (xfs_sb_version_hascrc(&mp->m_sb))
76 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
77 XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
78 XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
80 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
81 XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
84 rblock->bb_level = dblock->bb_level;
85 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
86 rblock->bb_numrecs = dblock->bb_numrecs;
87 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
88 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
89 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
90 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
91 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
92 dmxr = be16_to_cpu(dblock->bb_numrecs);
93 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
94 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
98 * Convert a compressed bmap extent record to an uncompressed form.
99 * This code must be in sync with the routines xfs_bmbt_get_startoff,
100 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
111 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
112 s->br_startoff = ((xfs_fileoff_t)l0 &
113 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
114 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
115 (((xfs_fsblock_t)l1) >> 21);
116 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
117 /* This is xfs_extent_state() in-line */
119 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
120 st = XFS_EXT_UNWRITTEN;
128 xfs_bmbt_rec_host_t *r,
131 __xfs_bmbt_get_all(r->l0, r->l1, s);
135 * Extract the blockcount field from an in memory bmap extent record.
138 xfs_bmbt_get_blockcount(
139 xfs_bmbt_rec_host_t *r)
141 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
145 * Extract the startblock field from an in memory bmap extent record.
148 xfs_bmbt_get_startblock(
149 xfs_bmbt_rec_host_t *r)
151 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
152 (((xfs_fsblock_t)r->l1) >> 21);
156 * Extract the startoff field from an in memory bmap extent record.
159 xfs_bmbt_get_startoff(
160 xfs_bmbt_rec_host_t *r)
162 return ((xfs_fileoff_t)r->l0 &
163 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
168 xfs_bmbt_rec_host_t *r)
172 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
173 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
178 * Extract the blockcount field from an on disk bmap extent record.
181 xfs_bmbt_disk_get_blockcount(
184 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
188 * Extract the startoff field from a disk format bmap extent record.
191 xfs_bmbt_disk_get_startoff(
194 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
195 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
200 * Set all the fields in a bmap extent record from the arguments.
204 xfs_bmbt_rec_host_t *r,
205 xfs_fileoff_t startoff,
206 xfs_fsblock_t startblock,
207 xfs_filblks_t blockcount,
210 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
212 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
213 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
214 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
216 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
218 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
219 ((xfs_bmbt_rec_base_t)startoff << 9) |
220 ((xfs_bmbt_rec_base_t)startblock >> 43);
221 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
222 ((xfs_bmbt_rec_base_t)blockcount &
223 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
227 * Set all the fields in a bmap extent record from the uncompressed form.
231 xfs_bmbt_rec_host_t *r,
234 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
235 s->br_blockcount, s->br_state);
240 * Set all the fields in a disk format bmap extent record from the arguments.
243 xfs_bmbt_disk_set_allf(
245 xfs_fileoff_t startoff,
246 xfs_fsblock_t startblock,
247 xfs_filblks_t blockcount,
250 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
252 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
253 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
254 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
255 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
258 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
259 ((xfs_bmbt_rec_base_t)startoff << 9) |
260 ((xfs_bmbt_rec_base_t)startblock >> 43));
262 ((xfs_bmbt_rec_base_t)startblock << 21) |
263 ((xfs_bmbt_rec_base_t)blockcount &
264 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
268 * Set all the fields in a bmap extent record from the uncompressed form.
271 xfs_bmbt_disk_set_all(
275 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
276 s->br_blockcount, s->br_state);
280 * Set the blockcount field in a bmap extent record.
283 xfs_bmbt_set_blockcount(
284 xfs_bmbt_rec_host_t *r,
287 ASSERT((v & xfs_mask64hi(43)) == 0);
288 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
289 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
293 * Set the startblock field in a bmap extent record.
296 xfs_bmbt_set_startblock(
297 xfs_bmbt_rec_host_t *r,
300 ASSERT((v & xfs_mask64hi(12)) == 0);
301 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
302 (xfs_bmbt_rec_base_t)(v >> 43);
303 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
304 (xfs_bmbt_rec_base_t)(v << 21);
308 * Set the startoff field in a bmap extent record.
311 xfs_bmbt_set_startoff(
312 xfs_bmbt_rec_host_t *r,
315 ASSERT((v & xfs_mask64hi(9)) == 0);
316 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
317 ((xfs_bmbt_rec_base_t)v << 9) |
318 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
322 * Set the extent state field in a bmap extent record.
326 xfs_bmbt_rec_host_t *r,
329 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
330 if (v == XFS_EXT_NORM)
331 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
333 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
337 * Convert in-memory form of btree root to on-disk form.
341 struct xfs_mount *mp,
342 struct xfs_btree_block *rblock,
344 xfs_bmdr_block_t *dblock,
353 if (xfs_sb_version_hascrc(&mp->m_sb)) {
354 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
355 ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid, &mp->m_sb.sb_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, flist, 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.flist = cur->bc_private.b.flist;
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.flist == src->bc_private.b.flist);
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;
452 if (args.fsbno == NULLFSBLOCK) {
453 args.fsbno = be64_to_cpu(start->l);
454 args.type = XFS_ALLOCTYPE_START_BNO;
456 * Make sure there is sufficient room left in the AG to
457 * complete a full tree split for an extent insert. If
458 * we are converting the middle part of an extent then
459 * we may need space for two tree splits.
461 * We are relying on the caller to make the correct block
462 * reservation for this operation to succeed. If the
463 * reservation amount is insufficient then we may fail a
464 * block allocation here and corrupt the filesystem.
466 args.minleft = xfs_trans_get_block_res(args.tp);
467 } else if (cur->bc_private.b.flist->xbf_low) {
468 args.type = XFS_ALLOCTYPE_START_BNO;
470 args.type = XFS_ALLOCTYPE_NEAR_BNO;
473 args.minlen = args.maxlen = args.prod = 1;
474 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
475 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
479 error = xfs_alloc_vextent(&args);
483 if (args.fsbno == NULLFSBLOCK && args.minleft) {
485 * Could not find an AG with enough free space to satisfy
486 * a full btree split. Try again without minleft and if
487 * successful activate the lowspace algorithm.
490 args.type = XFS_ALLOCTYPE_FIRST_AG;
492 error = xfs_alloc_vextent(&args);
495 cur->bc_private.b.flist->xbf_low = 1;
497 if (args.fsbno == NULLFSBLOCK) {
498 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
502 ASSERT(args.len == 1);
503 cur->bc_private.b.firstblock = args.fsbno;
504 cur->bc_private.b.allocated++;
505 cur->bc_private.b.ip->i_d.di_nblocks++;
506 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
507 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
508 XFS_TRANS_DQ_BCOUNT, 1L);
510 new->l = cpu_to_be64(args.fsbno);
512 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
517 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
523 struct xfs_btree_cur *cur,
526 struct xfs_mount *mp = cur->bc_mp;
527 struct xfs_inode *ip = cur->bc_private.b.ip;
528 struct xfs_trans *tp = cur->bc_tp;
529 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
531 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
532 ip->i_d.di_nblocks--;
534 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
535 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
536 xfs_trans_binval(tp, bp);
541 xfs_bmbt_get_minrecs(
542 struct xfs_btree_cur *cur,
545 if (level == cur->bc_nlevels - 1) {
546 struct xfs_ifork *ifp;
548 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
549 cur->bc_private.b.whichfork);
551 return xfs_bmbt_maxrecs(cur->bc_mp,
552 ifp->if_broot_bytes, level == 0) / 2;
555 return cur->bc_mp->m_bmap_dmnr[level != 0];
559 xfs_bmbt_get_maxrecs(
560 struct xfs_btree_cur *cur,
563 if (level == cur->bc_nlevels - 1) {
564 struct xfs_ifork *ifp;
566 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
567 cur->bc_private.b.whichfork);
569 return xfs_bmbt_maxrecs(cur->bc_mp,
570 ifp->if_broot_bytes, level == 0);
573 return cur->bc_mp->m_bmap_dmxr[level != 0];
578 * Get the maximum records we could store in the on-disk format.
580 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
581 * for the root node this checks the available space in the dinode fork
582 * so that we can resize the in-memory buffer to match it. After a
583 * resize to the maximum size this function returns the same value
584 * as xfs_bmbt_get_maxrecs for the root node, too.
587 xfs_bmbt_get_dmaxrecs(
588 struct xfs_btree_cur *cur,
591 if (level != cur->bc_nlevels - 1)
592 return cur->bc_mp->m_bmap_dmxr[level != 0];
593 return xfs_bmdr_maxrecs(cur->bc_private.b.forksize, level == 0);
597 xfs_bmbt_init_key_from_rec(
598 union xfs_btree_key *key,
599 union xfs_btree_rec *rec)
601 key->bmbt.br_startoff =
602 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
606 xfs_bmbt_init_rec_from_key(
607 union xfs_btree_key *key,
608 union xfs_btree_rec *rec)
610 ASSERT(key->bmbt.br_startoff != 0);
612 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
617 xfs_bmbt_init_rec_from_cur(
618 struct xfs_btree_cur *cur,
619 union xfs_btree_rec *rec)
621 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
625 xfs_bmbt_init_ptr_from_cur(
626 struct xfs_btree_cur *cur,
627 union xfs_btree_ptr *ptr)
634 struct xfs_btree_cur *cur,
635 union xfs_btree_key *key)
637 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
638 cur->bc_rec.b.br_startoff;
645 struct xfs_mount *mp = bp->b_target->bt_mount;
646 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
649 switch (block->bb_magic) {
650 case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
651 if (!xfs_sb_version_hascrc(&mp->m_sb))
653 if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid))
655 if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
658 * XXX: need a better way of verifying the owner here. Right now
659 * just make sure there has been one set.
661 if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
664 case cpu_to_be32(XFS_BMAP_MAGIC):
671 * numrecs and level verification.
673 * We don't know what fork we belong to, so just verify that the level
674 * is less than the maximum of the two. Later checks will be more
677 level = be16_to_cpu(block->bb_level);
678 if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
680 if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
683 /* sibling pointer verification */
684 if (!block->bb_u.l.bb_leftsib ||
685 (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
686 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
688 if (!block->bb_u.l.bb_rightsib ||
689 (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
690 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
697 xfs_bmbt_read_verify(
700 if (!xfs_btree_lblock_verify_crc(bp))
701 xfs_buf_ioerror(bp, -EFSBADCRC);
702 else if (!xfs_bmbt_verify(bp))
703 xfs_buf_ioerror(bp, -EFSCORRUPTED);
706 trace_xfs_btree_corrupt(bp, _RET_IP_);
707 xfs_verifier_error(bp);
712 xfs_bmbt_write_verify(
715 if (!xfs_bmbt_verify(bp)) {
716 trace_xfs_btree_corrupt(bp, _RET_IP_);
717 xfs_buf_ioerror(bp, -EFSCORRUPTED);
718 xfs_verifier_error(bp);
721 xfs_btree_lblock_calc_crc(bp);
724 const struct xfs_buf_ops xfs_bmbt_buf_ops = {
725 .verify_read = xfs_bmbt_read_verify,
726 .verify_write = xfs_bmbt_write_verify,
730 #if defined(DEBUG) || defined(XFS_WARN)
732 xfs_bmbt_keys_inorder(
733 struct xfs_btree_cur *cur,
734 union xfs_btree_key *k1,
735 union xfs_btree_key *k2)
737 return be64_to_cpu(k1->bmbt.br_startoff) <
738 be64_to_cpu(k2->bmbt.br_startoff);
742 xfs_bmbt_recs_inorder(
743 struct xfs_btree_cur *cur,
744 union xfs_btree_rec *r1,
745 union xfs_btree_rec *r2)
747 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
748 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
749 xfs_bmbt_disk_get_startoff(&r2->bmbt);
753 static const struct xfs_btree_ops xfs_bmbt_ops = {
754 .rec_len = sizeof(xfs_bmbt_rec_t),
755 .key_len = sizeof(xfs_bmbt_key_t),
757 .dup_cursor = xfs_bmbt_dup_cursor,
758 .update_cursor = xfs_bmbt_update_cursor,
759 .alloc_block = xfs_bmbt_alloc_block,
760 .free_block = xfs_bmbt_free_block,
761 .get_maxrecs = xfs_bmbt_get_maxrecs,
762 .get_minrecs = xfs_bmbt_get_minrecs,
763 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
764 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
765 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
766 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
767 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
768 .key_diff = xfs_bmbt_key_diff,
769 .buf_ops = &xfs_bmbt_buf_ops,
770 #if defined(DEBUG) || defined(XFS_WARN)
771 .keys_inorder = xfs_bmbt_keys_inorder,
772 .recs_inorder = xfs_bmbt_recs_inorder,
777 * Allocate a new bmap btree cursor.
779 struct xfs_btree_cur * /* new bmap btree cursor */
780 xfs_bmbt_init_cursor(
781 struct xfs_mount *mp, /* file system mount point */
782 struct xfs_trans *tp, /* transaction pointer */
783 struct xfs_inode *ip, /* inode owning the btree */
784 int whichfork) /* data or attr fork */
786 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
787 struct xfs_btree_cur *cur;
789 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
793 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
794 cur->bc_btnum = XFS_BTNUM_BMAP;
795 cur->bc_blocklog = mp->m_sb.sb_blocklog;
797 cur->bc_ops = &xfs_bmbt_ops;
798 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
799 if (xfs_sb_version_hascrc(&mp->m_sb))
800 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
802 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
803 cur->bc_private.b.ip = ip;
804 cur->bc_private.b.firstblock = NULLFSBLOCK;
805 cur->bc_private.b.flist = NULL;
806 cur->bc_private.b.allocated = 0;
807 cur->bc_private.b.flags = 0;
808 cur->bc_private.b.whichfork = whichfork;
814 * Calculate number of records in a bmap btree block.
818 struct xfs_mount *mp,
822 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
825 return blocklen / sizeof(xfs_bmbt_rec_t);
826 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
830 * Calculate number of records in a bmap btree inode root.
837 blocklen -= sizeof(xfs_bmdr_block_t);
840 return blocklen / sizeof(xfs_bmdr_rec_t);
841 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
845 * Change the owner of a btree format fork fo the inode passed in. Change it to
846 * the owner of that is passed in so that we can change owners before or after
847 * we switch forks between inodes. The operation that the caller is doing will
848 * determine whether is needs to change owner before or after the switch.
850 * For demand paged transactional modification, the fork switch should be done
851 * after reading in all the blocks, modifying them and pinning them in the
852 * transaction. For modification when the buffers are already pinned in memory,
853 * the fork switch can be done before changing the owner as we won't need to
854 * validate the owner until the btree buffers are unpinned and writes can occur
857 * For recovery based ownership change, there is no transactional context and
858 * so a buffer list must be supplied so that we can record the buffers that we
859 * modified for the caller to issue IO on.
862 xfs_bmbt_change_owner(
863 struct xfs_trans *tp,
864 struct xfs_inode *ip,
867 struct list_head *buffer_list)
869 struct xfs_btree_cur *cur;
872 ASSERT(tp || buffer_list);
873 ASSERT(!(tp && buffer_list));
874 if (whichfork == XFS_DATA_FORK)
875 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
877 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
879 cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
883 error = xfs_btree_change_owner(cur, new_owner, buffer_list);
884 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);