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![Christoph Hellwig](/assets/img/avatar_default.png)
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com>
3646 lines
94 KiB
C
3646 lines
94 KiB
C
/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_btree.h"
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#include "xfs_btree_trace.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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/*
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* Cursor allocation zone.
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*/
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kmem_zone_t *xfs_btree_cur_zone;
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/*
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* Btree magic numbers.
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*/
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const __uint32_t xfs_magics[XFS_BTNUM_MAX] = {
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XFS_ABTB_MAGIC, XFS_ABTC_MAGIC, XFS_BMAP_MAGIC, XFS_IBT_MAGIC
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};
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STATIC int /* error (0 or EFSCORRUPTED) */
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xfs_btree_check_lblock(
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struct xfs_btree_cur *cur, /* btree cursor */
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struct xfs_btree_block *block, /* btree long form block pointer */
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int level, /* level of the btree block */
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struct xfs_buf *bp) /* buffer for block, if any */
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{
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int lblock_ok; /* block passes checks */
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struct xfs_mount *mp; /* file system mount point */
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mp = cur->bc_mp;
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lblock_ok =
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be32_to_cpu(block->bb_magic) == xfs_magics[cur->bc_btnum] &&
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be16_to_cpu(block->bb_level) == level &&
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be16_to_cpu(block->bb_numrecs) <=
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cur->bc_ops->get_maxrecs(cur, level) &&
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block->bb_u.l.bb_leftsib &&
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(be64_to_cpu(block->bb_u.l.bb_leftsib) == NULLDFSBNO ||
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XFS_FSB_SANITY_CHECK(mp,
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be64_to_cpu(block->bb_u.l.bb_leftsib))) &&
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block->bb_u.l.bb_rightsib &&
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(be64_to_cpu(block->bb_u.l.bb_rightsib) == NULLDFSBNO ||
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XFS_FSB_SANITY_CHECK(mp,
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be64_to_cpu(block->bb_u.l.bb_rightsib)));
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if (unlikely(XFS_TEST_ERROR(!lblock_ok, mp,
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XFS_ERRTAG_BTREE_CHECK_LBLOCK,
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XFS_RANDOM_BTREE_CHECK_LBLOCK))) {
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if (bp)
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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XFS_ERROR_REPORT("xfs_btree_check_lblock", XFS_ERRLEVEL_LOW,
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mp);
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return XFS_ERROR(EFSCORRUPTED);
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}
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return 0;
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}
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STATIC int /* error (0 or EFSCORRUPTED) */
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xfs_btree_check_sblock(
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struct xfs_btree_cur *cur, /* btree cursor */
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struct xfs_btree_block *block, /* btree short form block pointer */
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int level, /* level of the btree block */
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struct xfs_buf *bp) /* buffer containing block */
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{
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struct xfs_buf *agbp; /* buffer for ag. freespace struct */
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struct xfs_agf *agf; /* ag. freespace structure */
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xfs_agblock_t agflen; /* native ag. freespace length */
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int sblock_ok; /* block passes checks */
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agbp = cur->bc_private.a.agbp;
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agf = XFS_BUF_TO_AGF(agbp);
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agflen = be32_to_cpu(agf->agf_length);
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sblock_ok =
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be32_to_cpu(block->bb_magic) == xfs_magics[cur->bc_btnum] &&
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be16_to_cpu(block->bb_level) == level &&
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be16_to_cpu(block->bb_numrecs) <=
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cur->bc_ops->get_maxrecs(cur, level) &&
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(be32_to_cpu(block->bb_u.s.bb_leftsib) == NULLAGBLOCK ||
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be32_to_cpu(block->bb_u.s.bb_leftsib) < agflen) &&
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block->bb_u.s.bb_leftsib &&
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(be32_to_cpu(block->bb_u.s.bb_rightsib) == NULLAGBLOCK ||
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be32_to_cpu(block->bb_u.s.bb_rightsib) < agflen) &&
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block->bb_u.s.bb_rightsib;
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if (unlikely(XFS_TEST_ERROR(!sblock_ok, cur->bc_mp,
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XFS_ERRTAG_BTREE_CHECK_SBLOCK,
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XFS_RANDOM_BTREE_CHECK_SBLOCK))) {
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if (bp)
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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XFS_CORRUPTION_ERROR("xfs_btree_check_sblock",
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XFS_ERRLEVEL_LOW, cur->bc_mp, block);
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return XFS_ERROR(EFSCORRUPTED);
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}
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return 0;
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}
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/*
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* Debug routine: check that block header is ok.
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*/
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int
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xfs_btree_check_block(
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struct xfs_btree_cur *cur, /* btree cursor */
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struct xfs_btree_block *block, /* generic btree block pointer */
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int level, /* level of the btree block */
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struct xfs_buf *bp) /* buffer containing block, if any */
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{
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if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
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return xfs_btree_check_lblock(cur, block, level, bp);
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else
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return xfs_btree_check_sblock(cur, block, level, bp);
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}
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/*
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* Check that (long) pointer is ok.
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*/
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int /* error (0 or EFSCORRUPTED) */
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xfs_btree_check_lptr(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_dfsbno_t bno, /* btree block disk address */
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int level) /* btree block level */
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{
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XFS_WANT_CORRUPTED_RETURN(
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level > 0 &&
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bno != NULLDFSBNO &&
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XFS_FSB_SANITY_CHECK(cur->bc_mp, bno));
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return 0;
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}
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#ifdef DEBUG
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/*
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* Check that (short) pointer is ok.
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*/
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STATIC int /* error (0 or EFSCORRUPTED) */
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xfs_btree_check_sptr(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agblock_t bno, /* btree block disk address */
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int level) /* btree block level */
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{
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xfs_agblock_t agblocks = cur->bc_mp->m_sb.sb_agblocks;
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XFS_WANT_CORRUPTED_RETURN(
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level > 0 &&
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bno != NULLAGBLOCK &&
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bno != 0 &&
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bno < agblocks);
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return 0;
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}
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/*
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* Check that block ptr is ok.
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*/
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STATIC int /* error (0 or EFSCORRUPTED) */
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xfs_btree_check_ptr(
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struct xfs_btree_cur *cur, /* btree cursor */
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union xfs_btree_ptr *ptr, /* btree block disk address */
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int index, /* offset from ptr to check */
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int level) /* btree block level */
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{
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if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
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return xfs_btree_check_lptr(cur,
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be64_to_cpu((&ptr->l)[index]), level);
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} else {
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return xfs_btree_check_sptr(cur,
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be32_to_cpu((&ptr->s)[index]), level);
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}
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}
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#endif
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/*
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* Delete the btree cursor.
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*/
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void
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xfs_btree_del_cursor(
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xfs_btree_cur_t *cur, /* btree cursor */
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int error) /* del because of error */
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{
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int i; /* btree level */
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/*
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* Clear the buffer pointers, and release the buffers.
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* If we're doing this in the face of an error, we
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* need to make sure to inspect all of the entries
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* in the bc_bufs array for buffers to be unlocked.
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* This is because some of the btree code works from
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* level n down to 0, and if we get an error along
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* the way we won't have initialized all the entries
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* down to 0.
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*/
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for (i = 0; i < cur->bc_nlevels; i++) {
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if (cur->bc_bufs[i])
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xfs_btree_setbuf(cur, i, NULL);
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else if (!error)
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break;
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}
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/*
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* Can't free a bmap cursor without having dealt with the
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* allocated indirect blocks' accounting.
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*/
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ASSERT(cur->bc_btnum != XFS_BTNUM_BMAP ||
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cur->bc_private.b.allocated == 0);
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/*
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* Free the cursor.
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*/
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kmem_zone_free(xfs_btree_cur_zone, cur);
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}
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/*
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* Duplicate the btree cursor.
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* Allocate a new one, copy the record, re-get the buffers.
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*/
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int /* error */
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xfs_btree_dup_cursor(
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xfs_btree_cur_t *cur, /* input cursor */
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xfs_btree_cur_t **ncur) /* output cursor */
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{
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xfs_buf_t *bp; /* btree block's buffer pointer */
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int error; /* error return value */
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int i; /* level number of btree block */
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xfs_mount_t *mp; /* mount structure for filesystem */
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xfs_btree_cur_t *new; /* new cursor value */
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xfs_trans_t *tp; /* transaction pointer, can be NULL */
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tp = cur->bc_tp;
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mp = cur->bc_mp;
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/*
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* Allocate a new cursor like the old one.
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*/
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new = cur->bc_ops->dup_cursor(cur);
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/*
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* Copy the record currently in the cursor.
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*/
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new->bc_rec = cur->bc_rec;
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/*
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* For each level current, re-get the buffer and copy the ptr value.
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*/
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for (i = 0; i < new->bc_nlevels; i++) {
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new->bc_ptrs[i] = cur->bc_ptrs[i];
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new->bc_ra[i] = cur->bc_ra[i];
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if ((bp = cur->bc_bufs[i])) {
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if ((error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
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XFS_BUF_ADDR(bp), mp->m_bsize, 0, &bp))) {
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xfs_btree_del_cursor(new, error);
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*ncur = NULL;
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return error;
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}
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new->bc_bufs[i] = bp;
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ASSERT(bp);
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ASSERT(!XFS_BUF_GETERROR(bp));
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} else
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new->bc_bufs[i] = NULL;
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}
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*ncur = new;
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return 0;
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}
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/*
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* XFS btree block layout and addressing:
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*
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* There are two types of blocks in the btree: leaf and non-leaf blocks.
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*
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* The leaf record start with a header then followed by records containing
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* the values. A non-leaf block also starts with the same header, and
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* then first contains lookup keys followed by an equal number of pointers
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* to the btree blocks at the previous level.
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*
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* +--------+-------+-------+-------+-------+-------+-------+
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* Leaf: | header | rec 1 | rec 2 | rec 3 | rec 4 | rec 5 | rec N |
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* +--------+-------+-------+-------+-------+-------+-------+
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*
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* +--------+-------+-------+-------+-------+-------+-------+
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* Non-Leaf: | header | key 1 | key 2 | key N | ptr 1 | ptr 2 | ptr N |
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* +--------+-------+-------+-------+-------+-------+-------+
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*
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* The header is called struct xfs_btree_block for reasons better left unknown
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* and comes in different versions for short (32bit) and long (64bit) block
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* pointers. The record and key structures are defined by the btree instances
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* and opaque to the btree core. The block pointers are simple disk endian
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* integers, available in a short (32bit) and long (64bit) variant.
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*
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* The helpers below calculate the offset of a given record, key or pointer
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* into a btree block (xfs_btree_*_offset) or return a pointer to the given
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* record, key or pointer (xfs_btree_*_addr). Note that all addressing
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* inside the btree block is done using indices starting at one, not zero!
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*/
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/*
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* Return size of the btree block header for this btree instance.
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*/
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static inline size_t xfs_btree_block_len(struct xfs_btree_cur *cur)
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{
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return (cur->bc_flags & XFS_BTREE_LONG_PTRS) ?
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XFS_BTREE_LBLOCK_LEN :
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XFS_BTREE_SBLOCK_LEN;
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}
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/*
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* Return size of btree block pointers for this btree instance.
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*/
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static inline size_t xfs_btree_ptr_len(struct xfs_btree_cur *cur)
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{
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return (cur->bc_flags & XFS_BTREE_LONG_PTRS) ?
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sizeof(__be64) : sizeof(__be32);
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}
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/*
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* Calculate offset of the n-th record in a btree block.
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*/
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STATIC size_t
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xfs_btree_rec_offset(
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struct xfs_btree_cur *cur,
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int n)
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{
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return xfs_btree_block_len(cur) +
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(n - 1) * cur->bc_ops->rec_len;
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}
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/*
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* Calculate offset of the n-th key in a btree block.
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*/
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STATIC size_t
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xfs_btree_key_offset(
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struct xfs_btree_cur *cur,
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int n)
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{
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return xfs_btree_block_len(cur) +
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(n - 1) * cur->bc_ops->key_len;
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}
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/*
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* Calculate offset of the n-th block pointer in a btree block.
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*/
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STATIC size_t
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xfs_btree_ptr_offset(
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struct xfs_btree_cur *cur,
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int n,
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int level)
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{
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return xfs_btree_block_len(cur) +
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cur->bc_ops->get_maxrecs(cur, level) * cur->bc_ops->key_len +
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(n - 1) * xfs_btree_ptr_len(cur);
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}
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/*
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* Return a pointer to the n-th record in the btree block.
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*/
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STATIC union xfs_btree_rec *
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xfs_btree_rec_addr(
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struct xfs_btree_cur *cur,
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int n,
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struct xfs_btree_block *block)
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{
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return (union xfs_btree_rec *)
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((char *)block + xfs_btree_rec_offset(cur, n));
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}
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||
|
||
/*
|
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* Return a pointer to the n-th key in the btree block.
|
||
*/
|
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STATIC union xfs_btree_key *
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xfs_btree_key_addr(
|
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struct xfs_btree_cur *cur,
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int n,
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struct xfs_btree_block *block)
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{
|
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return (union xfs_btree_key *)
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((char *)block + xfs_btree_key_offset(cur, n));
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}
|
||
|
||
/*
|
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* Return a pointer to the n-th block pointer in the btree block.
|
||
*/
|
||
STATIC union xfs_btree_ptr *
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xfs_btree_ptr_addr(
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||
struct xfs_btree_cur *cur,
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int n,
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struct xfs_btree_block *block)
|
||
{
|
||
int level = xfs_btree_get_level(block);
|
||
|
||
ASSERT(block->bb_level != 0);
|
||
|
||
return (union xfs_btree_ptr *)
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((char *)block + xfs_btree_ptr_offset(cur, n, level));
|
||
}
|
||
|
||
/*
|
||
* Get a the root block which is stored in the inode.
|
||
*
|
||
* For now this btree implementation assumes the btree root is always
|
||
* stored in the if_broot field of an inode fork.
|
||
*/
|
||
STATIC struct xfs_btree_block *
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||
xfs_btree_get_iroot(
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||
struct xfs_btree_cur *cur)
|
||
{
|
||
struct xfs_ifork *ifp;
|
||
|
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ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, cur->bc_private.b.whichfork);
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||
return (struct xfs_btree_block *)ifp->if_broot;
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||
}
|
||
|
||
/*
|
||
* Retrieve the block pointer from the cursor at the given level.
|
||
* This may be an inode btree root or from a buffer.
|
||
*/
|
||
STATIC struct xfs_btree_block * /* generic btree block pointer */
|
||
xfs_btree_get_block(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int level, /* level in btree */
|
||
struct xfs_buf **bpp) /* buffer containing the block */
|
||
{
|
||
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||
(level == cur->bc_nlevels - 1)) {
|
||
*bpp = NULL;
|
||
return xfs_btree_get_iroot(cur);
|
||
}
|
||
|
||
*bpp = cur->bc_bufs[level];
|
||
return XFS_BUF_TO_BLOCK(*bpp);
|
||
}
|
||
|
||
/*
|
||
* Get a buffer for the block, return it with no data read.
|
||
* Long-form addressing.
|
||
*/
|
||
xfs_buf_t * /* buffer for fsbno */
|
||
xfs_btree_get_bufl(
|
||
xfs_mount_t *mp, /* file system mount point */
|
||
xfs_trans_t *tp, /* transaction pointer */
|
||
xfs_fsblock_t fsbno, /* file system block number */
|
||
uint lock) /* lock flags for get_buf */
|
||
{
|
||
xfs_buf_t *bp; /* buffer pointer (return value) */
|
||
xfs_daddr_t d; /* real disk block address */
|
||
|
||
ASSERT(fsbno != NULLFSBLOCK);
|
||
d = XFS_FSB_TO_DADDR(mp, fsbno);
|
||
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, mp->m_bsize, lock);
|
||
ASSERT(bp);
|
||
ASSERT(!XFS_BUF_GETERROR(bp));
|
||
return bp;
|
||
}
|
||
|
||
/*
|
||
* Get a buffer for the block, return it with no data read.
|
||
* Short-form addressing.
|
||
*/
|
||
xfs_buf_t * /* buffer for agno/agbno */
|
||
xfs_btree_get_bufs(
|
||
xfs_mount_t *mp, /* file system mount point */
|
||
xfs_trans_t *tp, /* transaction pointer */
|
||
xfs_agnumber_t agno, /* allocation group number */
|
||
xfs_agblock_t agbno, /* allocation group block number */
|
||
uint lock) /* lock flags for get_buf */
|
||
{
|
||
xfs_buf_t *bp; /* buffer pointer (return value) */
|
||
xfs_daddr_t d; /* real disk block address */
|
||
|
||
ASSERT(agno != NULLAGNUMBER);
|
||
ASSERT(agbno != NULLAGBLOCK);
|
||
d = XFS_AGB_TO_DADDR(mp, agno, agbno);
|
||
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, mp->m_bsize, lock);
|
||
ASSERT(bp);
|
||
ASSERT(!XFS_BUF_GETERROR(bp));
|
||
return bp;
|
||
}
|
||
|
||
/*
|
||
* Check for the cursor referring to the last block at the given level.
|
||
*/
|
||
int /* 1=is last block, 0=not last block */
|
||
xfs_btree_islastblock(
|
||
xfs_btree_cur_t *cur, /* btree cursor */
|
||
int level) /* level to check */
|
||
{
|
||
struct xfs_btree_block *block; /* generic btree block pointer */
|
||
xfs_buf_t *bp; /* buffer containing block */
|
||
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
xfs_btree_check_block(cur, block, level, bp);
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
|
||
return be64_to_cpu(block->bb_u.l.bb_rightsib) == NULLDFSBNO;
|
||
else
|
||
return be32_to_cpu(block->bb_u.s.bb_rightsib) == NULLAGBLOCK;
|
||
}
|
||
|
||
/*
|
||
* Change the cursor to point to the first record at the given level.
|
||
* Other levels are unaffected.
|
||
*/
|
||
STATIC int /* success=1, failure=0 */
|
||
xfs_btree_firstrec(
|
||
xfs_btree_cur_t *cur, /* btree cursor */
|
||
int level) /* level to change */
|
||
{
|
||
struct xfs_btree_block *block; /* generic btree block pointer */
|
||
xfs_buf_t *bp; /* buffer containing block */
|
||
|
||
/*
|
||
* Get the block pointer for this level.
|
||
*/
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
xfs_btree_check_block(cur, block, level, bp);
|
||
/*
|
||
* It's empty, there is no such record.
|
||
*/
|
||
if (!block->bb_numrecs)
|
||
return 0;
|
||
/*
|
||
* Set the ptr value to 1, that's the first record/key.
|
||
*/
|
||
cur->bc_ptrs[level] = 1;
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
* Change the cursor to point to the last record in the current block
|
||
* at the given level. Other levels are unaffected.
|
||
*/
|
||
STATIC int /* success=1, failure=0 */
|
||
xfs_btree_lastrec(
|
||
xfs_btree_cur_t *cur, /* btree cursor */
|
||
int level) /* level to change */
|
||
{
|
||
struct xfs_btree_block *block; /* generic btree block pointer */
|
||
xfs_buf_t *bp; /* buffer containing block */
|
||
|
||
/*
|
||
* Get the block pointer for this level.
|
||
*/
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
xfs_btree_check_block(cur, block, level, bp);
|
||
/*
|
||
* It's empty, there is no such record.
|
||
*/
|
||
if (!block->bb_numrecs)
|
||
return 0;
|
||
/*
|
||
* Set the ptr value to numrecs, that's the last record/key.
|
||
*/
|
||
cur->bc_ptrs[level] = be16_to_cpu(block->bb_numrecs);
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
* Compute first and last byte offsets for the fields given.
|
||
* Interprets the offsets table, which contains struct field offsets.
|
||
*/
|
||
void
|
||
xfs_btree_offsets(
|
||
__int64_t fields, /* bitmask of fields */
|
||
const short *offsets, /* table of field offsets */
|
||
int nbits, /* number of bits to inspect */
|
||
int *first, /* output: first byte offset */
|
||
int *last) /* output: last byte offset */
|
||
{
|
||
int i; /* current bit number */
|
||
__int64_t imask; /* mask for current bit number */
|
||
|
||
ASSERT(fields != 0);
|
||
/*
|
||
* Find the lowest bit, so the first byte offset.
|
||
*/
|
||
for (i = 0, imask = 1LL; ; i++, imask <<= 1) {
|
||
if (imask & fields) {
|
||
*first = offsets[i];
|
||
break;
|
||
}
|
||
}
|
||
/*
|
||
* Find the highest bit, so the last byte offset.
|
||
*/
|
||
for (i = nbits - 1, imask = 1LL << i; ; i--, imask >>= 1) {
|
||
if (imask & fields) {
|
||
*last = offsets[i + 1] - 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Get a buffer for the block, return it read in.
|
||
* Long-form addressing.
|
||
*/
|
||
int /* error */
|
||
xfs_btree_read_bufl(
|
||
xfs_mount_t *mp, /* file system mount point */
|
||
xfs_trans_t *tp, /* transaction pointer */
|
||
xfs_fsblock_t fsbno, /* file system block number */
|
||
uint lock, /* lock flags for read_buf */
|
||
xfs_buf_t **bpp, /* buffer for fsbno */
|
||
int refval) /* ref count value for buffer */
|
||
{
|
||
xfs_buf_t *bp; /* return value */
|
||
xfs_daddr_t d; /* real disk block address */
|
||
int error;
|
||
|
||
ASSERT(fsbno != NULLFSBLOCK);
|
||
d = XFS_FSB_TO_DADDR(mp, fsbno);
|
||
if ((error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, d,
|
||
mp->m_bsize, lock, &bp))) {
|
||
return error;
|
||
}
|
||
ASSERT(!bp || !XFS_BUF_GETERROR(bp));
|
||
if (bp != NULL) {
|
||
XFS_BUF_SET_VTYPE_REF(bp, B_FS_MAP, refval);
|
||
}
|
||
*bpp = bp;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Read-ahead the block, don't wait for it, don't return a buffer.
|
||
* Long-form addressing.
|
||
*/
|
||
/* ARGSUSED */
|
||
void
|
||
xfs_btree_reada_bufl(
|
||
xfs_mount_t *mp, /* file system mount point */
|
||
xfs_fsblock_t fsbno, /* file system block number */
|
||
xfs_extlen_t count) /* count of filesystem blocks */
|
||
{
|
||
xfs_daddr_t d;
|
||
|
||
ASSERT(fsbno != NULLFSBLOCK);
|
||
d = XFS_FSB_TO_DADDR(mp, fsbno);
|
||
xfs_baread(mp->m_ddev_targp, d, mp->m_bsize * count);
|
||
}
|
||
|
||
/*
|
||
* Read-ahead the block, don't wait for it, don't return a buffer.
|
||
* Short-form addressing.
|
||
*/
|
||
/* ARGSUSED */
|
||
void
|
||
xfs_btree_reada_bufs(
|
||
xfs_mount_t *mp, /* file system mount point */
|
||
xfs_agnumber_t agno, /* allocation group number */
|
||
xfs_agblock_t agbno, /* allocation group block number */
|
||
xfs_extlen_t count) /* count of filesystem blocks */
|
||
{
|
||
xfs_daddr_t d;
|
||
|
||
ASSERT(agno != NULLAGNUMBER);
|
||
ASSERT(agbno != NULLAGBLOCK);
|
||
d = XFS_AGB_TO_DADDR(mp, agno, agbno);
|
||
xfs_baread(mp->m_ddev_targp, d, mp->m_bsize * count);
|
||
}
|
||
|
||
STATIC int
|
||
xfs_btree_readahead_lblock(
|
||
struct xfs_btree_cur *cur,
|
||
int lr,
|
||
struct xfs_btree_block *block)
|
||
{
|
||
int rval = 0;
|
||
xfs_dfsbno_t left = be64_to_cpu(block->bb_u.l.bb_leftsib);
|
||
xfs_dfsbno_t right = be64_to_cpu(block->bb_u.l.bb_rightsib);
|
||
|
||
if ((lr & XFS_BTCUR_LEFTRA) && left != NULLDFSBNO) {
|
||
xfs_btree_reada_bufl(cur->bc_mp, left, 1);
|
||
rval++;
|
||
}
|
||
|
||
if ((lr & XFS_BTCUR_RIGHTRA) && right != NULLDFSBNO) {
|
||
xfs_btree_reada_bufl(cur->bc_mp, right, 1);
|
||
rval++;
|
||
}
|
||
|
||
return rval;
|
||
}
|
||
|
||
STATIC int
|
||
xfs_btree_readahead_sblock(
|
||
struct xfs_btree_cur *cur,
|
||
int lr,
|
||
struct xfs_btree_block *block)
|
||
{
|
||
int rval = 0;
|
||
xfs_agblock_t left = be32_to_cpu(block->bb_u.s.bb_leftsib);
|
||
xfs_agblock_t right = be32_to_cpu(block->bb_u.s.bb_rightsib);
|
||
|
||
|
||
if ((lr & XFS_BTCUR_LEFTRA) && left != NULLAGBLOCK) {
|
||
xfs_btree_reada_bufs(cur->bc_mp, cur->bc_private.a.agno,
|
||
left, 1);
|
||
rval++;
|
||
}
|
||
|
||
if ((lr & XFS_BTCUR_RIGHTRA) && right != NULLAGBLOCK) {
|
||
xfs_btree_reada_bufs(cur->bc_mp, cur->bc_private.a.agno,
|
||
right, 1);
|
||
rval++;
|
||
}
|
||
|
||
return rval;
|
||
}
|
||
|
||
/*
|
||
* Read-ahead btree blocks, at the given level.
|
||
* Bits in lr are set from XFS_BTCUR_{LEFT,RIGHT}RA.
|
||
*/
|
||
STATIC int
|
||
xfs_btree_readahead(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int lev, /* level in btree */
|
||
int lr) /* left/right bits */
|
||
{
|
||
struct xfs_btree_block *block;
|
||
|
||
/*
|
||
* No readahead needed if we are at the root level and the
|
||
* btree root is stored in the inode.
|
||
*/
|
||
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||
(lev == cur->bc_nlevels - 1))
|
||
return 0;
|
||
|
||
if ((cur->bc_ra[lev] | lr) == cur->bc_ra[lev])
|
||
return 0;
|
||
|
||
cur->bc_ra[lev] |= lr;
|
||
block = XFS_BUF_TO_BLOCK(cur->bc_bufs[lev]);
|
||
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
|
||
return xfs_btree_readahead_lblock(cur, lr, block);
|
||
return xfs_btree_readahead_sblock(cur, lr, block);
|
||
}
|
||
|
||
/*
|
||
* Set the buffer for level "lev" in the cursor to bp, releasing
|
||
* any previous buffer.
|
||
*/
|
||
void
|
||
xfs_btree_setbuf(
|
||
xfs_btree_cur_t *cur, /* btree cursor */
|
||
int lev, /* level in btree */
|
||
xfs_buf_t *bp) /* new buffer to set */
|
||
{
|
||
struct xfs_btree_block *b; /* btree block */
|
||
xfs_buf_t *obp; /* old buffer pointer */
|
||
|
||
obp = cur->bc_bufs[lev];
|
||
if (obp)
|
||
xfs_trans_brelse(cur->bc_tp, obp);
|
||
cur->bc_bufs[lev] = bp;
|
||
cur->bc_ra[lev] = 0;
|
||
if (!bp)
|
||
return;
|
||
b = XFS_BUF_TO_BLOCK(bp);
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
|
||
if (be64_to_cpu(b->bb_u.l.bb_leftsib) == NULLDFSBNO)
|
||
cur->bc_ra[lev] |= XFS_BTCUR_LEFTRA;
|
||
if (be64_to_cpu(b->bb_u.l.bb_rightsib) == NULLDFSBNO)
|
||
cur->bc_ra[lev] |= XFS_BTCUR_RIGHTRA;
|
||
} else {
|
||
if (be32_to_cpu(b->bb_u.s.bb_leftsib) == NULLAGBLOCK)
|
||
cur->bc_ra[lev] |= XFS_BTCUR_LEFTRA;
|
||
if (be32_to_cpu(b->bb_u.s.bb_rightsib) == NULLAGBLOCK)
|
||
cur->bc_ra[lev] |= XFS_BTCUR_RIGHTRA;
|
||
}
|
||
}
|
||
|
||
STATIC int
|
||
xfs_btree_ptr_is_null(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_ptr *ptr)
|
||
{
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
|
||
return be64_to_cpu(ptr->l) == NULLDFSBNO;
|
||
else
|
||
return be32_to_cpu(ptr->s) == NULLAGBLOCK;
|
||
}
|
||
|
||
STATIC void
|
||
xfs_btree_set_ptr_null(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_ptr *ptr)
|
||
{
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
|
||
ptr->l = cpu_to_be64(NULLDFSBNO);
|
||
else
|
||
ptr->s = cpu_to_be32(NULLAGBLOCK);
|
||
}
|
||
|
||
/*
|
||
* Get/set/init sibling pointers
|
||
*/
|
||
STATIC void
|
||
xfs_btree_get_sibling(
|
||
struct xfs_btree_cur *cur,
|
||
struct xfs_btree_block *block,
|
||
union xfs_btree_ptr *ptr,
|
||
int lr)
|
||
{
|
||
ASSERT(lr == XFS_BB_LEFTSIB || lr == XFS_BB_RIGHTSIB);
|
||
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
|
||
if (lr == XFS_BB_RIGHTSIB)
|
||
ptr->l = block->bb_u.l.bb_rightsib;
|
||
else
|
||
ptr->l = block->bb_u.l.bb_leftsib;
|
||
} else {
|
||
if (lr == XFS_BB_RIGHTSIB)
|
||
ptr->s = block->bb_u.s.bb_rightsib;
|
||
else
|
||
ptr->s = block->bb_u.s.bb_leftsib;
|
||
}
|
||
}
|
||
|
||
STATIC void
|
||
xfs_btree_set_sibling(
|
||
struct xfs_btree_cur *cur,
|
||
struct xfs_btree_block *block,
|
||
union xfs_btree_ptr *ptr,
|
||
int lr)
|
||
{
|
||
ASSERT(lr == XFS_BB_LEFTSIB || lr == XFS_BB_RIGHTSIB);
|
||
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
|
||
if (lr == XFS_BB_RIGHTSIB)
|
||
block->bb_u.l.bb_rightsib = ptr->l;
|
||
else
|
||
block->bb_u.l.bb_leftsib = ptr->l;
|
||
} else {
|
||
if (lr == XFS_BB_RIGHTSIB)
|
||
block->bb_u.s.bb_rightsib = ptr->s;
|
||
else
|
||
block->bb_u.s.bb_leftsib = ptr->s;
|
||
}
|
||
}
|
||
|
||
STATIC void
|
||
xfs_btree_init_block(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
int numrecs,
|
||
struct xfs_btree_block *new) /* new block */
|
||
{
|
||
new->bb_magic = cpu_to_be32(xfs_magics[cur->bc_btnum]);
|
||
new->bb_level = cpu_to_be16(level);
|
||
new->bb_numrecs = cpu_to_be16(numrecs);
|
||
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
|
||
new->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
|
||
new->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
|
||
} else {
|
||
new->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
|
||
new->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Return true if ptr is the last record in the btree and
|
||
* we need to track updateѕ to this record. The decision
|
||
* will be further refined in the update_lastrec method.
|
||
*/
|
||
STATIC int
|
||
xfs_btree_is_lastrec(
|
||
struct xfs_btree_cur *cur,
|
||
struct xfs_btree_block *block,
|
||
int level)
|
||
{
|
||
union xfs_btree_ptr ptr;
|
||
|
||
if (level > 0)
|
||
return 0;
|
||
if (!(cur->bc_flags & XFS_BTREE_LASTREC_UPDATE))
|
||
return 0;
|
||
|
||
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_RIGHTSIB);
|
||
if (!xfs_btree_ptr_is_null(cur, &ptr))
|
||
return 0;
|
||
return 1;
|
||
}
|
||
|
||
STATIC void
|
||
xfs_btree_buf_to_ptr(
|
||
struct xfs_btree_cur *cur,
|
||
struct xfs_buf *bp,
|
||
union xfs_btree_ptr *ptr)
|
||
{
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
|
||
ptr->l = cpu_to_be64(XFS_DADDR_TO_FSB(cur->bc_mp,
|
||
XFS_BUF_ADDR(bp)));
|
||
else {
|
||
ptr->s = cpu_to_be32(xfs_daddr_to_agbno(cur->bc_mp,
|
||
XFS_BUF_ADDR(bp)));
|
||
}
|
||
}
|
||
|
||
STATIC xfs_daddr_t
|
||
xfs_btree_ptr_to_daddr(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_ptr *ptr)
|
||
{
|
||
if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
|
||
ASSERT(be64_to_cpu(ptr->l) != NULLDFSBNO);
|
||
|
||
return XFS_FSB_TO_DADDR(cur->bc_mp, be64_to_cpu(ptr->l));
|
||
} else {
|
||
ASSERT(cur->bc_private.a.agno != NULLAGNUMBER);
|
||
ASSERT(be32_to_cpu(ptr->s) != NULLAGBLOCK);
|
||
|
||
return XFS_AGB_TO_DADDR(cur->bc_mp, cur->bc_private.a.agno,
|
||
be32_to_cpu(ptr->s));
|
||
}
|
||
}
|
||
|
||
STATIC void
|
||
xfs_btree_set_refs(
|
||
struct xfs_btree_cur *cur,
|
||
struct xfs_buf *bp)
|
||
{
|
||
switch (cur->bc_btnum) {
|
||
case XFS_BTNUM_BNO:
|
||
case XFS_BTNUM_CNT:
|
||
XFS_BUF_SET_VTYPE_REF(*bpp, B_FS_MAP, XFS_ALLOC_BTREE_REF);
|
||
break;
|
||
case XFS_BTNUM_INO:
|
||
XFS_BUF_SET_VTYPE_REF(*bpp, B_FS_INOMAP, XFS_INO_BTREE_REF);
|
||
break;
|
||
case XFS_BTNUM_BMAP:
|
||
XFS_BUF_SET_VTYPE_REF(*bpp, B_FS_MAP, XFS_BMAP_BTREE_REF);
|
||
break;
|
||
default:
|
||
ASSERT(0);
|
||
}
|
||
}
|
||
|
||
STATIC int
|
||
xfs_btree_get_buf_block(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_ptr *ptr,
|
||
int flags,
|
||
struct xfs_btree_block **block,
|
||
struct xfs_buf **bpp)
|
||
{
|
||
struct xfs_mount *mp = cur->bc_mp;
|
||
xfs_daddr_t d;
|
||
|
||
/* need to sort out how callers deal with failures first */
|
||
ASSERT(!(flags & XBF_TRYLOCK));
|
||
|
||
d = xfs_btree_ptr_to_daddr(cur, ptr);
|
||
*bpp = xfs_trans_get_buf(cur->bc_tp, mp->m_ddev_targp, d,
|
||
mp->m_bsize, flags);
|
||
|
||
ASSERT(*bpp);
|
||
ASSERT(!XFS_BUF_GETERROR(*bpp));
|
||
|
||
*block = XFS_BUF_TO_BLOCK(*bpp);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Read in the buffer at the given ptr and return the buffer and
|
||
* the block pointer within the buffer.
|
||
*/
|
||
STATIC int
|
||
xfs_btree_read_buf_block(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_ptr *ptr,
|
||
int level,
|
||
int flags,
|
||
struct xfs_btree_block **block,
|
||
struct xfs_buf **bpp)
|
||
{
|
||
struct xfs_mount *mp = cur->bc_mp;
|
||
xfs_daddr_t d;
|
||
int error;
|
||
|
||
/* need to sort out how callers deal with failures first */
|
||
ASSERT(!(flags & XBF_TRYLOCK));
|
||
|
||
d = xfs_btree_ptr_to_daddr(cur, ptr);
|
||
error = xfs_trans_read_buf(mp, cur->bc_tp, mp->m_ddev_targp, d,
|
||
mp->m_bsize, flags, bpp);
|
||
if (error)
|
||
return error;
|
||
|
||
ASSERT(*bpp != NULL);
|
||
ASSERT(!XFS_BUF_GETERROR(*bpp));
|
||
|
||
xfs_btree_set_refs(cur, *bpp);
|
||
*block = XFS_BUF_TO_BLOCK(*bpp);
|
||
|
||
error = xfs_btree_check_block(cur, *block, level, *bpp);
|
||
if (error)
|
||
xfs_trans_brelse(cur->bc_tp, *bpp);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Copy keys from one btree block to another.
|
||
*/
|
||
STATIC void
|
||
xfs_btree_copy_keys(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_key *dst_key,
|
||
union xfs_btree_key *src_key,
|
||
int numkeys)
|
||
{
|
||
ASSERT(numkeys >= 0);
|
||
memcpy(dst_key, src_key, numkeys * cur->bc_ops->key_len);
|
||
}
|
||
|
||
/*
|
||
* Copy records from one btree block to another.
|
||
*/
|
||
STATIC void
|
||
xfs_btree_copy_recs(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_rec *dst_rec,
|
||
union xfs_btree_rec *src_rec,
|
||
int numrecs)
|
||
{
|
||
ASSERT(numrecs >= 0);
|
||
memcpy(dst_rec, src_rec, numrecs * cur->bc_ops->rec_len);
|
||
}
|
||
|
||
/*
|
||
* Copy block pointers from one btree block to another.
|
||
*/
|
||
STATIC void
|
||
xfs_btree_copy_ptrs(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_ptr *dst_ptr,
|
||
union xfs_btree_ptr *src_ptr,
|
||
int numptrs)
|
||
{
|
||
ASSERT(numptrs >= 0);
|
||
memcpy(dst_ptr, src_ptr, numptrs * xfs_btree_ptr_len(cur));
|
||
}
|
||
|
||
/*
|
||
* Shift keys one index left/right inside a single btree block.
|
||
*/
|
||
STATIC void
|
||
xfs_btree_shift_keys(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_key *key,
|
||
int dir,
|
||
int numkeys)
|
||
{
|
||
char *dst_key;
|
||
|
||
ASSERT(numkeys >= 0);
|
||
ASSERT(dir == 1 || dir == -1);
|
||
|
||
dst_key = (char *)key + (dir * cur->bc_ops->key_len);
|
||
memmove(dst_key, key, numkeys * cur->bc_ops->key_len);
|
||
}
|
||
|
||
/*
|
||
* Shift records one index left/right inside a single btree block.
|
||
*/
|
||
STATIC void
|
||
xfs_btree_shift_recs(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_rec *rec,
|
||
int dir,
|
||
int numrecs)
|
||
{
|
||
char *dst_rec;
|
||
|
||
ASSERT(numrecs >= 0);
|
||
ASSERT(dir == 1 || dir == -1);
|
||
|
||
dst_rec = (char *)rec + (dir * cur->bc_ops->rec_len);
|
||
memmove(dst_rec, rec, numrecs * cur->bc_ops->rec_len);
|
||
}
|
||
|
||
/*
|
||
* Shift block pointers one index left/right inside a single btree block.
|
||
*/
|
||
STATIC void
|
||
xfs_btree_shift_ptrs(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_ptr *ptr,
|
||
int dir,
|
||
int numptrs)
|
||
{
|
||
char *dst_ptr;
|
||
|
||
ASSERT(numptrs >= 0);
|
||
ASSERT(dir == 1 || dir == -1);
|
||
|
||
dst_ptr = (char *)ptr + (dir * xfs_btree_ptr_len(cur));
|
||
memmove(dst_ptr, ptr, numptrs * xfs_btree_ptr_len(cur));
|
||
}
|
||
|
||
/*
|
||
* Log key values from the btree block.
|
||
*/
|
||
STATIC void
|
||
xfs_btree_log_keys(
|
||
struct xfs_btree_cur *cur,
|
||
struct xfs_buf *bp,
|
||
int first,
|
||
int last)
|
||
{
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGBII(cur, bp, first, last);
|
||
|
||
if (bp) {
|
||
xfs_trans_log_buf(cur->bc_tp, bp,
|
||
xfs_btree_key_offset(cur, first),
|
||
xfs_btree_key_offset(cur, last + 1) - 1);
|
||
} else {
|
||
xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip,
|
||
xfs_ilog_fbroot(cur->bc_private.b.whichfork));
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
}
|
||
|
||
/*
|
||
* Log record values from the btree block.
|
||
*/
|
||
void
|
||
xfs_btree_log_recs(
|
||
struct xfs_btree_cur *cur,
|
||
struct xfs_buf *bp,
|
||
int first,
|
||
int last)
|
||
{
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGBII(cur, bp, first, last);
|
||
|
||
xfs_trans_log_buf(cur->bc_tp, bp,
|
||
xfs_btree_rec_offset(cur, first),
|
||
xfs_btree_rec_offset(cur, last + 1) - 1);
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
}
|
||
|
||
/*
|
||
* Log block pointer fields from a btree block (nonleaf).
|
||
*/
|
||
STATIC void
|
||
xfs_btree_log_ptrs(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
struct xfs_buf *bp, /* buffer containing btree block */
|
||
int first, /* index of first pointer to log */
|
||
int last) /* index of last pointer to log */
|
||
{
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGBII(cur, bp, first, last);
|
||
|
||
if (bp) {
|
||
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
|
||
int level = xfs_btree_get_level(block);
|
||
|
||
xfs_trans_log_buf(cur->bc_tp, bp,
|
||
xfs_btree_ptr_offset(cur, first, level),
|
||
xfs_btree_ptr_offset(cur, last + 1, level) - 1);
|
||
} else {
|
||
xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip,
|
||
xfs_ilog_fbroot(cur->bc_private.b.whichfork));
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
}
|
||
|
||
/*
|
||
* Log fields from a btree block header.
|
||
*/
|
||
void
|
||
xfs_btree_log_block(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
struct xfs_buf *bp, /* buffer containing btree block */
|
||
int fields) /* mask of fields: XFS_BB_... */
|
||
{
|
||
int first; /* first byte offset logged */
|
||
int last; /* last byte offset logged */
|
||
static const short soffsets[] = { /* table of offsets (short) */
|
||
offsetof(struct xfs_btree_block, bb_magic),
|
||
offsetof(struct xfs_btree_block, bb_level),
|
||
offsetof(struct xfs_btree_block, bb_numrecs),
|
||
offsetof(struct xfs_btree_block, bb_u.s.bb_leftsib),
|
||
offsetof(struct xfs_btree_block, bb_u.s.bb_rightsib),
|
||
XFS_BTREE_SBLOCK_LEN
|
||
};
|
||
static const short loffsets[] = { /* table of offsets (long) */
|
||
offsetof(struct xfs_btree_block, bb_magic),
|
||
offsetof(struct xfs_btree_block, bb_level),
|
||
offsetof(struct xfs_btree_block, bb_numrecs),
|
||
offsetof(struct xfs_btree_block, bb_u.l.bb_leftsib),
|
||
offsetof(struct xfs_btree_block, bb_u.l.bb_rightsib),
|
||
XFS_BTREE_LBLOCK_LEN
|
||
};
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGBI(cur, bp, fields);
|
||
|
||
if (bp) {
|
||
xfs_btree_offsets(fields,
|
||
(cur->bc_flags & XFS_BTREE_LONG_PTRS) ?
|
||
loffsets : soffsets,
|
||
XFS_BB_NUM_BITS, &first, &last);
|
||
xfs_trans_log_buf(cur->bc_tp, bp, first, last);
|
||
} else {
|
||
xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip,
|
||
xfs_ilog_fbroot(cur->bc_private.b.whichfork));
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
}
|
||
|
||
/*
|
||
* Increment cursor by one record at the level.
|
||
* For nonzero levels the leaf-ward information is untouched.
|
||
*/
|
||
int /* error */
|
||
xfs_btree_increment(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
int *stat) /* success/failure */
|
||
{
|
||
struct xfs_btree_block *block;
|
||
union xfs_btree_ptr ptr;
|
||
struct xfs_buf *bp;
|
||
int error; /* error return value */
|
||
int lev;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGI(cur, level);
|
||
|
||
ASSERT(level < cur->bc_nlevels);
|
||
|
||
/* Read-ahead to the right at this level. */
|
||
xfs_btree_readahead(cur, level, XFS_BTCUR_RIGHTRA);
|
||
|
||
/* Get a pointer to the btree block. */
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, level, bp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
/* We're done if we remain in the block after the increment. */
|
||
if (++cur->bc_ptrs[level] <= xfs_btree_get_numrecs(block))
|
||
goto out1;
|
||
|
||
/* Fail if we just went off the right edge of the tree. */
|
||
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_RIGHTSIB);
|
||
if (xfs_btree_ptr_is_null(cur, &ptr))
|
||
goto out0;
|
||
|
||
XFS_BTREE_STATS_INC(cur, increment);
|
||
|
||
/*
|
||
* March up the tree incrementing pointers.
|
||
* Stop when we don't go off the right edge of a block.
|
||
*/
|
||
for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
|
||
block = xfs_btree_get_block(cur, lev, &bp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, lev, bp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
if (++cur->bc_ptrs[lev] <= xfs_btree_get_numrecs(block))
|
||
break;
|
||
|
||
/* Read-ahead the right block for the next loop. */
|
||
xfs_btree_readahead(cur, lev, XFS_BTCUR_RIGHTRA);
|
||
}
|
||
|
||
/*
|
||
* If we went off the root then we are either seriously
|
||
* confused or have the tree root in an inode.
|
||
*/
|
||
if (lev == cur->bc_nlevels) {
|
||
if (cur->bc_flags & XFS_BTREE_ROOT_IN_INODE)
|
||
goto out0;
|
||
ASSERT(0);
|
||
error = EFSCORRUPTED;
|
||
goto error0;
|
||
}
|
||
ASSERT(lev < cur->bc_nlevels);
|
||
|
||
/*
|
||
* Now walk back down the tree, fixing up the cursor's buffer
|
||
* pointers and key numbers.
|
||
*/
|
||
for (block = xfs_btree_get_block(cur, lev, &bp); lev > level; ) {
|
||
union xfs_btree_ptr *ptrp;
|
||
|
||
ptrp = xfs_btree_ptr_addr(cur, cur->bc_ptrs[lev], block);
|
||
error = xfs_btree_read_buf_block(cur, ptrp, --lev,
|
||
0, &block, &bp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
xfs_btree_setbuf(cur, lev, bp);
|
||
cur->bc_ptrs[lev] = 1;
|
||
}
|
||
out1:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
|
||
out0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Decrement cursor by one record at the level.
|
||
* For nonzero levels the leaf-ward information is untouched.
|
||
*/
|
||
int /* error */
|
||
xfs_btree_decrement(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
int *stat) /* success/failure */
|
||
{
|
||
struct xfs_btree_block *block;
|
||
xfs_buf_t *bp;
|
||
int error; /* error return value */
|
||
int lev;
|
||
union xfs_btree_ptr ptr;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGI(cur, level);
|
||
|
||
ASSERT(level < cur->bc_nlevels);
|
||
|
||
/* Read-ahead to the left at this level. */
|
||
xfs_btree_readahead(cur, level, XFS_BTCUR_LEFTRA);
|
||
|
||
/* We're done if we remain in the block after the decrement. */
|
||
if (--cur->bc_ptrs[level] > 0)
|
||
goto out1;
|
||
|
||
/* Get a pointer to the btree block. */
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, level, bp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
/* Fail if we just went off the left edge of the tree. */
|
||
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_LEFTSIB);
|
||
if (xfs_btree_ptr_is_null(cur, &ptr))
|
||
goto out0;
|
||
|
||
XFS_BTREE_STATS_INC(cur, decrement);
|
||
|
||
/*
|
||
* March up the tree decrementing pointers.
|
||
* Stop when we don't go off the left edge of a block.
|
||
*/
|
||
for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
|
||
if (--cur->bc_ptrs[lev] > 0)
|
||
break;
|
||
/* Read-ahead the left block for the next loop. */
|
||
xfs_btree_readahead(cur, lev, XFS_BTCUR_LEFTRA);
|
||
}
|
||
|
||
/*
|
||
* If we went off the root then we are seriously confused.
|
||
* or the root of the tree is in an inode.
|
||
*/
|
||
if (lev == cur->bc_nlevels) {
|
||
if (cur->bc_flags & XFS_BTREE_ROOT_IN_INODE)
|
||
goto out0;
|
||
ASSERT(0);
|
||
error = EFSCORRUPTED;
|
||
goto error0;
|
||
}
|
||
ASSERT(lev < cur->bc_nlevels);
|
||
|
||
/*
|
||
* Now walk back down the tree, fixing up the cursor's buffer
|
||
* pointers and key numbers.
|
||
*/
|
||
for (block = xfs_btree_get_block(cur, lev, &bp); lev > level; ) {
|
||
union xfs_btree_ptr *ptrp;
|
||
|
||
ptrp = xfs_btree_ptr_addr(cur, cur->bc_ptrs[lev], block);
|
||
error = xfs_btree_read_buf_block(cur, ptrp, --lev,
|
||
0, &block, &bp);
|
||
if (error)
|
||
goto error0;
|
||
xfs_btree_setbuf(cur, lev, bp);
|
||
cur->bc_ptrs[lev] = xfs_btree_get_numrecs(block);
|
||
}
|
||
out1:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
|
||
out0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
STATIC int
|
||
xfs_btree_lookup_get_block(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int level, /* level in the btree */
|
||
union xfs_btree_ptr *pp, /* ptr to btree block */
|
||
struct xfs_btree_block **blkp) /* return btree block */
|
||
{
|
||
struct xfs_buf *bp; /* buffer pointer for btree block */
|
||
int error = 0;
|
||
|
||
/* special case the root block if in an inode */
|
||
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||
(level == cur->bc_nlevels - 1)) {
|
||
*blkp = xfs_btree_get_iroot(cur);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* If the old buffer at this level for the disk address we are
|
||
* looking for re-use it.
|
||
*
|
||
* Otherwise throw it away and get a new one.
|
||
*/
|
||
bp = cur->bc_bufs[level];
|
||
if (bp && XFS_BUF_ADDR(bp) == xfs_btree_ptr_to_daddr(cur, pp)) {
|
||
*blkp = XFS_BUF_TO_BLOCK(bp);
|
||
return 0;
|
||
}
|
||
|
||
error = xfs_btree_read_buf_block(cur, pp, level, 0, blkp, &bp);
|
||
if (error)
|
||
return error;
|
||
|
||
xfs_btree_setbuf(cur, level, bp);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Get current search key. For level 0 we don't actually have a key
|
||
* structure so we make one up from the record. For all other levels
|
||
* we just return the right key.
|
||
*/
|
||
STATIC union xfs_btree_key *
|
||
xfs_lookup_get_search_key(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
int keyno,
|
||
struct xfs_btree_block *block,
|
||
union xfs_btree_key *kp)
|
||
{
|
||
if (level == 0) {
|
||
cur->bc_ops->init_key_from_rec(kp,
|
||
xfs_btree_rec_addr(cur, keyno, block));
|
||
return kp;
|
||
}
|
||
|
||
return xfs_btree_key_addr(cur, keyno, block);
|
||
}
|
||
|
||
/*
|
||
* Lookup the record. The cursor is made to point to it, based on dir.
|
||
* Return 0 if can't find any such record, 1 for success.
|
||
*/
|
||
int /* error */
|
||
xfs_btree_lookup(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
xfs_lookup_t dir, /* <=, ==, or >= */
|
||
int *stat) /* success/failure */
|
||
{
|
||
struct xfs_btree_block *block; /* current btree block */
|
||
__int64_t diff; /* difference for the current key */
|
||
int error; /* error return value */
|
||
int keyno; /* current key number */
|
||
int level; /* level in the btree */
|
||
union xfs_btree_ptr *pp; /* ptr to btree block */
|
||
union xfs_btree_ptr ptr; /* ptr to btree block */
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGI(cur, dir);
|
||
|
||
XFS_BTREE_STATS_INC(cur, lookup);
|
||
|
||
block = NULL;
|
||
keyno = 0;
|
||
|
||
/* initialise start pointer from cursor */
|
||
cur->bc_ops->init_ptr_from_cur(cur, &ptr);
|
||
pp = &ptr;
|
||
|
||
/*
|
||
* Iterate over each level in the btree, starting at the root.
|
||
* For each level above the leaves, find the key we need, based
|
||
* on the lookup record, then follow the corresponding block
|
||
* pointer down to the next level.
|
||
*/
|
||
for (level = cur->bc_nlevels - 1, diff = 1; level >= 0; level--) {
|
||
/* Get the block we need to do the lookup on. */
|
||
error = xfs_btree_lookup_get_block(cur, level, pp, &block);
|
||
if (error)
|
||
goto error0;
|
||
|
||
if (diff == 0) {
|
||
/*
|
||
* If we already had a key match at a higher level, we
|
||
* know we need to use the first entry in this block.
|
||
*/
|
||
keyno = 1;
|
||
} else {
|
||
/* Otherwise search this block. Do a binary search. */
|
||
|
||
int high; /* high entry number */
|
||
int low; /* low entry number */
|
||
|
||
/* Set low and high entry numbers, 1-based. */
|
||
low = 1;
|
||
high = xfs_btree_get_numrecs(block);
|
||
if (!high) {
|
||
/* Block is empty, must be an empty leaf. */
|
||
ASSERT(level == 0 && cur->bc_nlevels == 1);
|
||
|
||
cur->bc_ptrs[0] = dir != XFS_LOOKUP_LE;
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
}
|
||
|
||
/* Binary search the block. */
|
||
while (low <= high) {
|
||
union xfs_btree_key key;
|
||
union xfs_btree_key *kp;
|
||
|
||
XFS_BTREE_STATS_INC(cur, compare);
|
||
|
||
/* keyno is average of low and high. */
|
||
keyno = (low + high) >> 1;
|
||
|
||
/* Get current search key */
|
||
kp = xfs_lookup_get_search_key(cur, level,
|
||
keyno, block, &key);
|
||
|
||
/*
|
||
* Compute difference to get next direction:
|
||
* - less than, move right
|
||
* - greater than, move left
|
||
* - equal, we're done
|
||
*/
|
||
diff = cur->bc_ops->key_diff(cur, kp);
|
||
if (diff < 0)
|
||
low = keyno + 1;
|
||
else if (diff > 0)
|
||
high = keyno - 1;
|
||
else
|
||
break;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* If there are more levels, set up for the next level
|
||
* by getting the block number and filling in the cursor.
|
||
*/
|
||
if (level > 0) {
|
||
/*
|
||
* If we moved left, need the previous key number,
|
||
* unless there isn't one.
|
||
*/
|
||
if (diff > 0 && --keyno < 1)
|
||
keyno = 1;
|
||
pp = xfs_btree_ptr_addr(cur, keyno, block);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_ptr(cur, pp, 0, level);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
cur->bc_ptrs[level] = keyno;
|
||
}
|
||
}
|
||
|
||
/* Done with the search. See if we need to adjust the results. */
|
||
if (dir != XFS_LOOKUP_LE && diff < 0) {
|
||
keyno++;
|
||
/*
|
||
* If ge search and we went off the end of the block, but it's
|
||
* not the last block, we're in the wrong block.
|
||
*/
|
||
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_RIGHTSIB);
|
||
if (dir == XFS_LOOKUP_GE &&
|
||
keyno > xfs_btree_get_numrecs(block) &&
|
||
!xfs_btree_ptr_is_null(cur, &ptr)) {
|
||
int i;
|
||
|
||
cur->bc_ptrs[0] = keyno;
|
||
error = xfs_btree_increment(cur, 0, &i);
|
||
if (error)
|
||
goto error0;
|
||
XFS_WANT_CORRUPTED_RETURN(i == 1);
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
}
|
||
} else if (dir == XFS_LOOKUP_LE && diff > 0)
|
||
keyno--;
|
||
cur->bc_ptrs[0] = keyno;
|
||
|
||
/* Return if we succeeded or not. */
|
||
if (keyno == 0 || keyno > xfs_btree_get_numrecs(block))
|
||
*stat = 0;
|
||
else if (dir != XFS_LOOKUP_EQ || diff == 0)
|
||
*stat = 1;
|
||
else
|
||
*stat = 0;
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Update keys at all levels from here to the root along the cursor's path.
|
||
*/
|
||
STATIC int
|
||
xfs_btree_updkey(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_key *keyp,
|
||
int level)
|
||
{
|
||
struct xfs_btree_block *block;
|
||
struct xfs_buf *bp;
|
||
union xfs_btree_key *kp;
|
||
int ptr;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGIK(cur, level, keyp);
|
||
|
||
ASSERT(!(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) || level >= 1);
|
||
|
||
/*
|
||
* Go up the tree from this level toward the root.
|
||
* At each level, update the key value to the value input.
|
||
* Stop when we reach a level where the cursor isn't pointing
|
||
* at the first entry in the block.
|
||
*/
|
||
for (ptr = 1; ptr == 1 && level < cur->bc_nlevels; level++) {
|
||
#ifdef DEBUG
|
||
int error;
|
||
#endif
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, level, bp);
|
||
if (error) {
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
#endif
|
||
ptr = cur->bc_ptrs[level];
|
||
kp = xfs_btree_key_addr(cur, ptr, block);
|
||
xfs_btree_copy_keys(cur, kp, keyp, 1);
|
||
xfs_btree_log_keys(cur, bp, ptr, ptr);
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Update the record referred to by cur to the value in the
|
||
* given record. This either works (return 0) or gets an
|
||
* EFSCORRUPTED error.
|
||
*/
|
||
int
|
||
xfs_btree_update(
|
||
struct xfs_btree_cur *cur,
|
||
union xfs_btree_rec *rec)
|
||
{
|
||
struct xfs_btree_block *block;
|
||
struct xfs_buf *bp;
|
||
int error;
|
||
int ptr;
|
||
union xfs_btree_rec *rp;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGR(cur, rec);
|
||
|
||
/* Pick up the current block. */
|
||
block = xfs_btree_get_block(cur, 0, &bp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, 0, bp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
/* Get the address of the rec to be updated. */
|
||
ptr = cur->bc_ptrs[0];
|
||
rp = xfs_btree_rec_addr(cur, ptr, block);
|
||
|
||
/* Fill in the new contents and log them. */
|
||
xfs_btree_copy_recs(cur, rp, rec, 1);
|
||
xfs_btree_log_recs(cur, bp, ptr, ptr);
|
||
|
||
/*
|
||
* If we are tracking the last record in the tree and
|
||
* we are at the far right edge of the tree, update it.
|
||
*/
|
||
if (xfs_btree_is_lastrec(cur, block, 0)) {
|
||
cur->bc_ops->update_lastrec(cur, block, rec,
|
||
ptr, LASTREC_UPDATE);
|
||
}
|
||
|
||
/* Updating first rec in leaf. Pass new key value up to our parent. */
|
||
if (ptr == 1) {
|
||
union xfs_btree_key key;
|
||
|
||
cur->bc_ops->init_key_from_rec(&key, rec);
|
||
error = xfs_btree_updkey(cur, &key, 1);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Move 1 record left from cur/level if possible.
|
||
* Update cur to reflect the new path.
|
||
*/
|
||
STATIC int /* error */
|
||
xfs_btree_lshift(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
int *stat) /* success/failure */
|
||
{
|
||
union xfs_btree_key key; /* btree key */
|
||
struct xfs_buf *lbp; /* left buffer pointer */
|
||
struct xfs_btree_block *left; /* left btree block */
|
||
int lrecs; /* left record count */
|
||
struct xfs_buf *rbp; /* right buffer pointer */
|
||
struct xfs_btree_block *right; /* right btree block */
|
||
int rrecs; /* right record count */
|
||
union xfs_btree_ptr lptr; /* left btree pointer */
|
||
union xfs_btree_key *rkp = NULL; /* right btree key */
|
||
union xfs_btree_ptr *rpp = NULL; /* right address pointer */
|
||
union xfs_btree_rec *rrp = NULL; /* right record pointer */
|
||
int error; /* error return value */
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGI(cur, level);
|
||
|
||
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||
level == cur->bc_nlevels - 1)
|
||
goto out0;
|
||
|
||
/* Set up variables for this block as "right". */
|
||
right = xfs_btree_get_block(cur, level, &rbp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, right, level, rbp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
/* If we've got no left sibling then we can't shift an entry left. */
|
||
xfs_btree_get_sibling(cur, right, &lptr, XFS_BB_LEFTSIB);
|
||
if (xfs_btree_ptr_is_null(cur, &lptr))
|
||
goto out0;
|
||
|
||
/*
|
||
* If the cursor entry is the one that would be moved, don't
|
||
* do it... it's too complicated.
|
||
*/
|
||
if (cur->bc_ptrs[level] <= 1)
|
||
goto out0;
|
||
|
||
/* Set up the left neighbor as "left". */
|
||
error = xfs_btree_read_buf_block(cur, &lptr, level, 0, &left, &lbp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/* If it's full, it can't take another entry. */
|
||
lrecs = xfs_btree_get_numrecs(left);
|
||
if (lrecs == cur->bc_ops->get_maxrecs(cur, level))
|
||
goto out0;
|
||
|
||
rrecs = xfs_btree_get_numrecs(right);
|
||
|
||
/*
|
||
* We add one entry to the left side and remove one for the right side.
|
||
* Account for it here, the changes will be updated on disk and logged
|
||
* later.
|
||
*/
|
||
lrecs++;
|
||
rrecs--;
|
||
|
||
XFS_BTREE_STATS_INC(cur, lshift);
|
||
XFS_BTREE_STATS_ADD(cur, moves, 1);
|
||
|
||
/*
|
||
* If non-leaf, copy a key and a ptr to the left block.
|
||
* Log the changes to the left block.
|
||
*/
|
||
if (level > 0) {
|
||
/* It's a non-leaf. Move keys and pointers. */
|
||
union xfs_btree_key *lkp; /* left btree key */
|
||
union xfs_btree_ptr *lpp; /* left address pointer */
|
||
|
||
lkp = xfs_btree_key_addr(cur, lrecs, left);
|
||
rkp = xfs_btree_key_addr(cur, 1, right);
|
||
|
||
lpp = xfs_btree_ptr_addr(cur, lrecs, left);
|
||
rpp = xfs_btree_ptr_addr(cur, 1, right);
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_ptr(cur, rpp, 0, level);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
xfs_btree_copy_keys(cur, lkp, rkp, 1);
|
||
xfs_btree_copy_ptrs(cur, lpp, rpp, 1);
|
||
|
||
xfs_btree_log_keys(cur, lbp, lrecs, lrecs);
|
||
xfs_btree_log_ptrs(cur, lbp, lrecs, lrecs);
|
||
|
||
ASSERT(cur->bc_ops->keys_inorder(cur,
|
||
xfs_btree_key_addr(cur, lrecs - 1, left), lkp));
|
||
} else {
|
||
/* It's a leaf. Move records. */
|
||
union xfs_btree_rec *lrp; /* left record pointer */
|
||
|
||
lrp = xfs_btree_rec_addr(cur, lrecs, left);
|
||
rrp = xfs_btree_rec_addr(cur, 1, right);
|
||
|
||
xfs_btree_copy_recs(cur, lrp, rrp, 1);
|
||
xfs_btree_log_recs(cur, lbp, lrecs, lrecs);
|
||
|
||
ASSERT(cur->bc_ops->recs_inorder(cur,
|
||
xfs_btree_rec_addr(cur, lrecs - 1, left), lrp));
|
||
}
|
||
|
||
xfs_btree_set_numrecs(left, lrecs);
|
||
xfs_btree_log_block(cur, lbp, XFS_BB_NUMRECS);
|
||
|
||
xfs_btree_set_numrecs(right, rrecs);
|
||
xfs_btree_log_block(cur, rbp, XFS_BB_NUMRECS);
|
||
|
||
/*
|
||
* Slide the contents of right down one entry.
|
||
*/
|
||
XFS_BTREE_STATS_ADD(cur, moves, rrecs - 1);
|
||
if (level > 0) {
|
||
/* It's a nonleaf. operate on keys and ptrs */
|
||
#ifdef DEBUG
|
||
int i; /* loop index */
|
||
|
||
for (i = 0; i < rrecs; i++) {
|
||
error = xfs_btree_check_ptr(cur, rpp, i + 1, level);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
#endif
|
||
xfs_btree_shift_keys(cur,
|
||
xfs_btree_key_addr(cur, 2, right),
|
||
-1, rrecs);
|
||
xfs_btree_shift_ptrs(cur,
|
||
xfs_btree_ptr_addr(cur, 2, right),
|
||
-1, rrecs);
|
||
|
||
xfs_btree_log_keys(cur, rbp, 1, rrecs);
|
||
xfs_btree_log_ptrs(cur, rbp, 1, rrecs);
|
||
} else {
|
||
/* It's a leaf. operate on records */
|
||
xfs_btree_shift_recs(cur,
|
||
xfs_btree_rec_addr(cur, 2, right),
|
||
-1, rrecs);
|
||
xfs_btree_log_recs(cur, rbp, 1, rrecs);
|
||
|
||
/*
|
||
* If it's the first record in the block, we'll need a key
|
||
* structure to pass up to the next level (updkey).
|
||
*/
|
||
cur->bc_ops->init_key_from_rec(&key,
|
||
xfs_btree_rec_addr(cur, 1, right));
|
||
rkp = &key;
|
||
}
|
||
|
||
/* Update the parent key values of right. */
|
||
error = xfs_btree_updkey(cur, rkp, level + 1);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/* Slide the cursor value left one. */
|
||
cur->bc_ptrs[level]--;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
|
||
out0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Move 1 record right from cur/level if possible.
|
||
* Update cur to reflect the new path.
|
||
*/
|
||
STATIC int /* error */
|
||
xfs_btree_rshift(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
int *stat) /* success/failure */
|
||
{
|
||
union xfs_btree_key key; /* btree key */
|
||
struct xfs_buf *lbp; /* left buffer pointer */
|
||
struct xfs_btree_block *left; /* left btree block */
|
||
struct xfs_buf *rbp; /* right buffer pointer */
|
||
struct xfs_btree_block *right; /* right btree block */
|
||
struct xfs_btree_cur *tcur; /* temporary btree cursor */
|
||
union xfs_btree_ptr rptr; /* right block pointer */
|
||
union xfs_btree_key *rkp; /* right btree key */
|
||
int rrecs; /* right record count */
|
||
int lrecs; /* left record count */
|
||
int error; /* error return value */
|
||
int i; /* loop counter */
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGI(cur, level);
|
||
|
||
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||
(level == cur->bc_nlevels - 1))
|
||
goto out0;
|
||
|
||
/* Set up variables for this block as "left". */
|
||
left = xfs_btree_get_block(cur, level, &lbp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, left, level, lbp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
/* If we've got no right sibling then we can't shift an entry right. */
|
||
xfs_btree_get_sibling(cur, left, &rptr, XFS_BB_RIGHTSIB);
|
||
if (xfs_btree_ptr_is_null(cur, &rptr))
|
||
goto out0;
|
||
|
||
/*
|
||
* If the cursor entry is the one that would be moved, don't
|
||
* do it... it's too complicated.
|
||
*/
|
||
lrecs = xfs_btree_get_numrecs(left);
|
||
if (cur->bc_ptrs[level] >= lrecs)
|
||
goto out0;
|
||
|
||
/* Set up the right neighbor as "right". */
|
||
error = xfs_btree_read_buf_block(cur, &rptr, level, 0, &right, &rbp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/* If it's full, it can't take another entry. */
|
||
rrecs = xfs_btree_get_numrecs(right);
|
||
if (rrecs == cur->bc_ops->get_maxrecs(cur, level))
|
||
goto out0;
|
||
|
||
XFS_BTREE_STATS_INC(cur, rshift);
|
||
XFS_BTREE_STATS_ADD(cur, moves, rrecs);
|
||
|
||
/*
|
||
* Make a hole at the start of the right neighbor block, then
|
||
* copy the last left block entry to the hole.
|
||
*/
|
||
if (level > 0) {
|
||
/* It's a nonleaf. make a hole in the keys and ptrs */
|
||
union xfs_btree_key *lkp;
|
||
union xfs_btree_ptr *lpp;
|
||
union xfs_btree_ptr *rpp;
|
||
|
||
lkp = xfs_btree_key_addr(cur, lrecs, left);
|
||
lpp = xfs_btree_ptr_addr(cur, lrecs, left);
|
||
rkp = xfs_btree_key_addr(cur, 1, right);
|
||
rpp = xfs_btree_ptr_addr(cur, 1, right);
|
||
|
||
#ifdef DEBUG
|
||
for (i = rrecs - 1; i >= 0; i--) {
|
||
error = xfs_btree_check_ptr(cur, rpp, i, level);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
#endif
|
||
|
||
xfs_btree_shift_keys(cur, rkp, 1, rrecs);
|
||
xfs_btree_shift_ptrs(cur, rpp, 1, rrecs);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_ptr(cur, lpp, 0, level);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
/* Now put the new data in, and log it. */
|
||
xfs_btree_copy_keys(cur, rkp, lkp, 1);
|
||
xfs_btree_copy_ptrs(cur, rpp, lpp, 1);
|
||
|
||
xfs_btree_log_keys(cur, rbp, 1, rrecs + 1);
|
||
xfs_btree_log_ptrs(cur, rbp, 1, rrecs + 1);
|
||
|
||
ASSERT(cur->bc_ops->keys_inorder(cur, rkp,
|
||
xfs_btree_key_addr(cur, 2, right)));
|
||
} else {
|
||
/* It's a leaf. make a hole in the records */
|
||
union xfs_btree_rec *lrp;
|
||
union xfs_btree_rec *rrp;
|
||
|
||
lrp = xfs_btree_rec_addr(cur, lrecs, left);
|
||
rrp = xfs_btree_rec_addr(cur, 1, right);
|
||
|
||
xfs_btree_shift_recs(cur, rrp, 1, rrecs);
|
||
|
||
/* Now put the new data in, and log it. */
|
||
xfs_btree_copy_recs(cur, rrp, lrp, 1);
|
||
xfs_btree_log_recs(cur, rbp, 1, rrecs + 1);
|
||
|
||
cur->bc_ops->init_key_from_rec(&key, rrp);
|
||
rkp = &key;
|
||
|
||
ASSERT(cur->bc_ops->recs_inorder(cur, rrp,
|
||
xfs_btree_rec_addr(cur, 2, right)));
|
||
}
|
||
|
||
/*
|
||
* Decrement and log left's numrecs, bump and log right's numrecs.
|
||
*/
|
||
xfs_btree_set_numrecs(left, --lrecs);
|
||
xfs_btree_log_block(cur, lbp, XFS_BB_NUMRECS);
|
||
|
||
xfs_btree_set_numrecs(right, ++rrecs);
|
||
xfs_btree_log_block(cur, rbp, XFS_BB_NUMRECS);
|
||
|
||
/*
|
||
* Using a temporary cursor, update the parent key values of the
|
||
* block on the right.
|
||
*/
|
||
error = xfs_btree_dup_cursor(cur, &tcur);
|
||
if (error)
|
||
goto error0;
|
||
i = xfs_btree_lastrec(tcur, level);
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
|
||
error = xfs_btree_increment(tcur, level, &i);
|
||
if (error)
|
||
goto error1;
|
||
|
||
error = xfs_btree_updkey(tcur, rkp, level + 1);
|
||
if (error)
|
||
goto error1;
|
||
|
||
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
|
||
out0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
|
||
error1:
|
||
XFS_BTREE_TRACE_CURSOR(tcur, XBT_ERROR);
|
||
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Split cur/level block in half.
|
||
* Return new block number and the key to its first
|
||
* record (to be inserted into parent).
|
||
*/
|
||
STATIC int /* error */
|
||
xfs_btree_split(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
union xfs_btree_ptr *ptrp,
|
||
union xfs_btree_key *key,
|
||
struct xfs_btree_cur **curp,
|
||
int *stat) /* success/failure */
|
||
{
|
||
union xfs_btree_ptr lptr; /* left sibling block ptr */
|
||
struct xfs_buf *lbp; /* left buffer pointer */
|
||
struct xfs_btree_block *left; /* left btree block */
|
||
union xfs_btree_ptr rptr; /* right sibling block ptr */
|
||
struct xfs_buf *rbp; /* right buffer pointer */
|
||
struct xfs_btree_block *right; /* right btree block */
|
||
union xfs_btree_ptr rrptr; /* right-right sibling ptr */
|
||
struct xfs_buf *rrbp; /* right-right buffer pointer */
|
||
struct xfs_btree_block *rrblock; /* right-right btree block */
|
||
int lrecs;
|
||
int rrecs;
|
||
int src_index;
|
||
int error; /* error return value */
|
||
#ifdef DEBUG
|
||
int i;
|
||
#endif
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGIPK(cur, level, *ptrp, key);
|
||
|
||
XFS_BTREE_STATS_INC(cur, split);
|
||
|
||
/* Set up left block (current one). */
|
||
left = xfs_btree_get_block(cur, level, &lbp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, left, level, lbp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
xfs_btree_buf_to_ptr(cur, lbp, &lptr);
|
||
|
||
/* Allocate the new block. If we can't do it, we're toast. Give up. */
|
||
error = cur->bc_ops->alloc_block(cur, &lptr, &rptr, 1, stat);
|
||
if (error)
|
||
goto error0;
|
||
if (*stat == 0)
|
||
goto out0;
|
||
XFS_BTREE_STATS_INC(cur, alloc);
|
||
|
||
/* Set up the new block as "right". */
|
||
error = xfs_btree_get_buf_block(cur, &rptr, 0, &right, &rbp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/* Fill in the btree header for the new right block. */
|
||
xfs_btree_init_block(cur, xfs_btree_get_level(left), 0, right);
|
||
|
||
/*
|
||
* Split the entries between the old and the new block evenly.
|
||
* Make sure that if there's an odd number of entries now, that
|
||
* each new block will have the same number of entries.
|
||
*/
|
||
lrecs = xfs_btree_get_numrecs(left);
|
||
rrecs = lrecs / 2;
|
||
if ((lrecs & 1) && cur->bc_ptrs[level] <= rrecs + 1)
|
||
rrecs++;
|
||
src_index = (lrecs - rrecs + 1);
|
||
|
||
XFS_BTREE_STATS_ADD(cur, moves, rrecs);
|
||
|
||
/*
|
||
* Copy btree block entries from the left block over to the
|
||
* new block, the right. Update the right block and log the
|
||
* changes.
|
||
*/
|
||
if (level > 0) {
|
||
/* It's a non-leaf. Move keys and pointers. */
|
||
union xfs_btree_key *lkp; /* left btree key */
|
||
union xfs_btree_ptr *lpp; /* left address pointer */
|
||
union xfs_btree_key *rkp; /* right btree key */
|
||
union xfs_btree_ptr *rpp; /* right address pointer */
|
||
|
||
lkp = xfs_btree_key_addr(cur, src_index, left);
|
||
lpp = xfs_btree_ptr_addr(cur, src_index, left);
|
||
rkp = xfs_btree_key_addr(cur, 1, right);
|
||
rpp = xfs_btree_ptr_addr(cur, 1, right);
|
||
|
||
#ifdef DEBUG
|
||
for (i = src_index; i < rrecs; i++) {
|
||
error = xfs_btree_check_ptr(cur, lpp, i, level);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
#endif
|
||
|
||
xfs_btree_copy_keys(cur, rkp, lkp, rrecs);
|
||
xfs_btree_copy_ptrs(cur, rpp, lpp, rrecs);
|
||
|
||
xfs_btree_log_keys(cur, rbp, 1, rrecs);
|
||
xfs_btree_log_ptrs(cur, rbp, 1, rrecs);
|
||
|
||
/* Grab the keys to the entries moved to the right block */
|
||
xfs_btree_copy_keys(cur, key, rkp, 1);
|
||
} else {
|
||
/* It's a leaf. Move records. */
|
||
union xfs_btree_rec *lrp; /* left record pointer */
|
||
union xfs_btree_rec *rrp; /* right record pointer */
|
||
|
||
lrp = xfs_btree_rec_addr(cur, src_index, left);
|
||
rrp = xfs_btree_rec_addr(cur, 1, right);
|
||
|
||
xfs_btree_copy_recs(cur, rrp, lrp, rrecs);
|
||
xfs_btree_log_recs(cur, rbp, 1, rrecs);
|
||
|
||
cur->bc_ops->init_key_from_rec(key,
|
||
xfs_btree_rec_addr(cur, 1, right));
|
||
}
|
||
|
||
|
||
/*
|
||
* Find the left block number by looking in the buffer.
|
||
* Adjust numrecs, sibling pointers.
|
||
*/
|
||
xfs_btree_get_sibling(cur, left, &rrptr, XFS_BB_RIGHTSIB);
|
||
xfs_btree_set_sibling(cur, right, &rrptr, XFS_BB_RIGHTSIB);
|
||
xfs_btree_set_sibling(cur, right, &lptr, XFS_BB_LEFTSIB);
|
||
xfs_btree_set_sibling(cur, left, &rptr, XFS_BB_RIGHTSIB);
|
||
|
||
lrecs -= rrecs;
|
||
xfs_btree_set_numrecs(left, lrecs);
|
||
xfs_btree_set_numrecs(right, xfs_btree_get_numrecs(right) + rrecs);
|
||
|
||
xfs_btree_log_block(cur, rbp, XFS_BB_ALL_BITS);
|
||
xfs_btree_log_block(cur, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
|
||
|
||
/*
|
||
* If there's a block to the new block's right, make that block
|
||
* point back to right instead of to left.
|
||
*/
|
||
if (!xfs_btree_ptr_is_null(cur, &rrptr)) {
|
||
error = xfs_btree_read_buf_block(cur, &rrptr, level,
|
||
0, &rrblock, &rrbp);
|
||
if (error)
|
||
goto error0;
|
||
xfs_btree_set_sibling(cur, rrblock, &rptr, XFS_BB_LEFTSIB);
|
||
xfs_btree_log_block(cur, rrbp, XFS_BB_LEFTSIB);
|
||
}
|
||
/*
|
||
* If the cursor is really in the right block, move it there.
|
||
* If it's just pointing past the last entry in left, then we'll
|
||
* insert there, so don't change anything in that case.
|
||
*/
|
||
if (cur->bc_ptrs[level] > lrecs + 1) {
|
||
xfs_btree_setbuf(cur, level, rbp);
|
||
cur->bc_ptrs[level] -= lrecs;
|
||
}
|
||
/*
|
||
* If there are more levels, we'll need another cursor which refers
|
||
* the right block, no matter where this cursor was.
|
||
*/
|
||
if (level + 1 < cur->bc_nlevels) {
|
||
error = xfs_btree_dup_cursor(cur, curp);
|
||
if (error)
|
||
goto error0;
|
||
(*curp)->bc_ptrs[level + 1]++;
|
||
}
|
||
*ptrp = rptr;
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
out0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Copy the old inode root contents into a real block and make the
|
||
* broot point to it.
|
||
*/
|
||
int /* error */
|
||
xfs_btree_new_iroot(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int *logflags, /* logging flags for inode */
|
||
int *stat) /* return status - 0 fail */
|
||
{
|
||
struct xfs_buf *cbp; /* buffer for cblock */
|
||
struct xfs_btree_block *block; /* btree block */
|
||
struct xfs_btree_block *cblock; /* child btree block */
|
||
union xfs_btree_key *ckp; /* child key pointer */
|
||
union xfs_btree_ptr *cpp; /* child ptr pointer */
|
||
union xfs_btree_key *kp; /* pointer to btree key */
|
||
union xfs_btree_ptr *pp; /* pointer to block addr */
|
||
union xfs_btree_ptr nptr; /* new block addr */
|
||
int level; /* btree level */
|
||
int error; /* error return code */
|
||
#ifdef DEBUG
|
||
int i; /* loop counter */
|
||
#endif
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_STATS_INC(cur, newroot);
|
||
|
||
ASSERT(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE);
|
||
|
||
level = cur->bc_nlevels - 1;
|
||
|
||
block = xfs_btree_get_iroot(cur);
|
||
pp = xfs_btree_ptr_addr(cur, 1, block);
|
||
|
||
/* Allocate the new block. If we can't do it, we're toast. Give up. */
|
||
error = cur->bc_ops->alloc_block(cur, pp, &nptr, 1, stat);
|
||
if (error)
|
||
goto error0;
|
||
if (*stat == 0) {
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
return 0;
|
||
}
|
||
XFS_BTREE_STATS_INC(cur, alloc);
|
||
|
||
/* Copy the root into a real block. */
|
||
error = xfs_btree_get_buf_block(cur, &nptr, 0, &cblock, &cbp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
memcpy(cblock, block, xfs_btree_block_len(cur));
|
||
|
||
be16_add_cpu(&block->bb_level, 1);
|
||
xfs_btree_set_numrecs(block, 1);
|
||
cur->bc_nlevels++;
|
||
cur->bc_ptrs[level + 1] = 1;
|
||
|
||
kp = xfs_btree_key_addr(cur, 1, block);
|
||
ckp = xfs_btree_key_addr(cur, 1, cblock);
|
||
xfs_btree_copy_keys(cur, ckp, kp, xfs_btree_get_numrecs(cblock));
|
||
|
||
cpp = xfs_btree_ptr_addr(cur, 1, cblock);
|
||
#ifdef DEBUG
|
||
for (i = 0; i < be16_to_cpu(cblock->bb_numrecs); i++) {
|
||
error = xfs_btree_check_ptr(cur, pp, i, level);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
#endif
|
||
xfs_btree_copy_ptrs(cur, cpp, pp, xfs_btree_get_numrecs(cblock));
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_ptr(cur, &nptr, 0, level);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
xfs_btree_copy_ptrs(cur, pp, &nptr, 1);
|
||
|
||
xfs_iroot_realloc(cur->bc_private.b.ip,
|
||
1 - xfs_btree_get_numrecs(cblock),
|
||
cur->bc_private.b.whichfork);
|
||
|
||
xfs_btree_setbuf(cur, level, cbp);
|
||
|
||
/*
|
||
* Do all this logging at the end so that
|
||
* the root is at the right level.
|
||
*/
|
||
xfs_btree_log_block(cur, cbp, XFS_BB_ALL_BITS);
|
||
xfs_btree_log_keys(cur, cbp, 1, be16_to_cpu(cblock->bb_numrecs));
|
||
xfs_btree_log_ptrs(cur, cbp, 1, be16_to_cpu(cblock->bb_numrecs));
|
||
|
||
*logflags |=
|
||
XFS_ILOG_CORE | xfs_ilog_fbroot(cur->bc_private.b.whichfork);
|
||
*stat = 1;
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
return 0;
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Allocate a new root block, fill it in.
|
||
*/
|
||
STATIC int /* error */
|
||
xfs_btree_new_root(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int *stat) /* success/failure */
|
||
{
|
||
struct xfs_btree_block *block; /* one half of the old root block */
|
||
struct xfs_buf *bp; /* buffer containing block */
|
||
int error; /* error return value */
|
||
struct xfs_buf *lbp; /* left buffer pointer */
|
||
struct xfs_btree_block *left; /* left btree block */
|
||
struct xfs_buf *nbp; /* new (root) buffer */
|
||
struct xfs_btree_block *new; /* new (root) btree block */
|
||
int nptr; /* new value for key index, 1 or 2 */
|
||
struct xfs_buf *rbp; /* right buffer pointer */
|
||
struct xfs_btree_block *right; /* right btree block */
|
||
union xfs_btree_ptr rptr;
|
||
union xfs_btree_ptr lptr;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_STATS_INC(cur, newroot);
|
||
|
||
/* initialise our start point from the cursor */
|
||
cur->bc_ops->init_ptr_from_cur(cur, &rptr);
|
||
|
||
/* Allocate the new block. If we can't do it, we're toast. Give up. */
|
||
error = cur->bc_ops->alloc_block(cur, &rptr, &lptr, 1, stat);
|
||
if (error)
|
||
goto error0;
|
||
if (*stat == 0)
|
||
goto out0;
|
||
XFS_BTREE_STATS_INC(cur, alloc);
|
||
|
||
/* Set up the new block. */
|
||
error = xfs_btree_get_buf_block(cur, &lptr, 0, &new, &nbp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/* Set the root in the holding structure increasing the level by 1. */
|
||
cur->bc_ops->set_root(cur, &lptr, 1);
|
||
|
||
/*
|
||
* At the previous root level there are now two blocks: the old root,
|
||
* and the new block generated when it was split. We don't know which
|
||
* one the cursor is pointing at, so we set up variables "left" and
|
||
* "right" for each case.
|
||
*/
|
||
block = xfs_btree_get_block(cur, cur->bc_nlevels - 1, &bp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, cur->bc_nlevels - 1, bp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
xfs_btree_get_sibling(cur, block, &rptr, XFS_BB_RIGHTSIB);
|
||
if (!xfs_btree_ptr_is_null(cur, &rptr)) {
|
||
/* Our block is left, pick up the right block. */
|
||
lbp = bp;
|
||
xfs_btree_buf_to_ptr(cur, lbp, &lptr);
|
||
left = block;
|
||
error = xfs_btree_read_buf_block(cur, &rptr,
|
||
cur->bc_nlevels - 1, 0, &right, &rbp);
|
||
if (error)
|
||
goto error0;
|
||
bp = rbp;
|
||
nptr = 1;
|
||
} else {
|
||
/* Our block is right, pick up the left block. */
|
||
rbp = bp;
|
||
xfs_btree_buf_to_ptr(cur, rbp, &rptr);
|
||
right = block;
|
||
xfs_btree_get_sibling(cur, right, &lptr, XFS_BB_LEFTSIB);
|
||
error = xfs_btree_read_buf_block(cur, &lptr,
|
||
cur->bc_nlevels - 1, 0, &left, &lbp);
|
||
if (error)
|
||
goto error0;
|
||
bp = lbp;
|
||
nptr = 2;
|
||
}
|
||
/* Fill in the new block's btree header and log it. */
|
||
xfs_btree_init_block(cur, cur->bc_nlevels, 2, new);
|
||
xfs_btree_log_block(cur, nbp, XFS_BB_ALL_BITS);
|
||
ASSERT(!xfs_btree_ptr_is_null(cur, &lptr) &&
|
||
!xfs_btree_ptr_is_null(cur, &rptr));
|
||
|
||
/* Fill in the key data in the new root. */
|
||
if (xfs_btree_get_level(left) > 0) {
|
||
xfs_btree_copy_keys(cur,
|
||
xfs_btree_key_addr(cur, 1, new),
|
||
xfs_btree_key_addr(cur, 1, left), 1);
|
||
xfs_btree_copy_keys(cur,
|
||
xfs_btree_key_addr(cur, 2, new),
|
||
xfs_btree_key_addr(cur, 1, right), 1);
|
||
} else {
|
||
cur->bc_ops->init_key_from_rec(
|
||
xfs_btree_key_addr(cur, 1, new),
|
||
xfs_btree_rec_addr(cur, 1, left));
|
||
cur->bc_ops->init_key_from_rec(
|
||
xfs_btree_key_addr(cur, 2, new),
|
||
xfs_btree_rec_addr(cur, 1, right));
|
||
}
|
||
xfs_btree_log_keys(cur, nbp, 1, 2);
|
||
|
||
/* Fill in the pointer data in the new root. */
|
||
xfs_btree_copy_ptrs(cur,
|
||
xfs_btree_ptr_addr(cur, 1, new), &lptr, 1);
|
||
xfs_btree_copy_ptrs(cur,
|
||
xfs_btree_ptr_addr(cur, 2, new), &rptr, 1);
|
||
xfs_btree_log_ptrs(cur, nbp, 1, 2);
|
||
|
||
/* Fix up the cursor. */
|
||
xfs_btree_setbuf(cur, cur->bc_nlevels, nbp);
|
||
cur->bc_ptrs[cur->bc_nlevels] = nptr;
|
||
cur->bc_nlevels++;
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
out0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
}
|
||
|
||
STATIC int
|
||
xfs_btree_make_block_unfull(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int level, /* btree level */
|
||
int numrecs,/* # of recs in block */
|
||
int *oindex,/* old tree index */
|
||
int *index, /* new tree index */
|
||
union xfs_btree_ptr *nptr, /* new btree ptr */
|
||
struct xfs_btree_cur **ncur, /* new btree cursor */
|
||
union xfs_btree_rec *nrec, /* new record */
|
||
int *stat)
|
||
{
|
||
union xfs_btree_key key; /* new btree key value */
|
||
int error = 0;
|
||
|
||
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||
level == cur->bc_nlevels - 1) {
|
||
struct xfs_inode *ip = cur->bc_private.b.ip;
|
||
|
||
if (numrecs < cur->bc_ops->get_dmaxrecs(cur, level)) {
|
||
/* A root block that can be made bigger. */
|
||
|
||
xfs_iroot_realloc(ip, 1, cur->bc_private.b.whichfork);
|
||
} else {
|
||
/* A root block that needs replacing */
|
||
int logflags = 0;
|
||
|
||
error = xfs_btree_new_iroot(cur, &logflags, stat);
|
||
if (error || *stat == 0)
|
||
return error;
|
||
|
||
xfs_trans_log_inode(cur->bc_tp, ip, logflags);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* First, try shifting an entry to the right neighbor. */
|
||
error = xfs_btree_rshift(cur, level, stat);
|
||
if (error || *stat)
|
||
return error;
|
||
|
||
/* Next, try shifting an entry to the left neighbor. */
|
||
error = xfs_btree_lshift(cur, level, stat);
|
||
if (error)
|
||
return error;
|
||
|
||
if (*stat) {
|
||
*oindex = *index = cur->bc_ptrs[level];
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Next, try splitting the current block in half.
|
||
*
|
||
* If this works we have to re-set our variables because we
|
||
* could be in a different block now.
|
||
*/
|
||
error = xfs_btree_split(cur, level, nptr, &key, ncur, stat);
|
||
if (error || *stat == 0)
|
||
return error;
|
||
|
||
|
||
*index = cur->bc_ptrs[level];
|
||
cur->bc_ops->init_rec_from_key(&key, nrec);
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Insert one record/level. Return information to the caller
|
||
* allowing the next level up to proceed if necessary.
|
||
*/
|
||
STATIC int
|
||
xfs_btree_insrec(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int level, /* level to insert record at */
|
||
union xfs_btree_ptr *ptrp, /* i/o: block number inserted */
|
||
union xfs_btree_rec *recp, /* i/o: record data inserted */
|
||
struct xfs_btree_cur **curp, /* output: new cursor replacing cur */
|
||
int *stat) /* success/failure */
|
||
{
|
||
struct xfs_btree_block *block; /* btree block */
|
||
struct xfs_buf *bp; /* buffer for block */
|
||
union xfs_btree_key key; /* btree key */
|
||
union xfs_btree_ptr nptr; /* new block ptr */
|
||
struct xfs_btree_cur *ncur; /* new btree cursor */
|
||
union xfs_btree_rec nrec; /* new record count */
|
||
int optr; /* old key/record index */
|
||
int ptr; /* key/record index */
|
||
int numrecs;/* number of records */
|
||
int error; /* error return value */
|
||
#ifdef DEBUG
|
||
int i;
|
||
#endif
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGIPR(cur, level, *ptrp, recp);
|
||
|
||
ncur = NULL;
|
||
|
||
/*
|
||
* If we have an external root pointer, and we've made it to the
|
||
* root level, allocate a new root block and we're done.
|
||
*/
|
||
if (!(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) &&
|
||
(level >= cur->bc_nlevels)) {
|
||
error = xfs_btree_new_root(cur, stat);
|
||
xfs_btree_set_ptr_null(cur, ptrp);
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
return error;
|
||
}
|
||
|
||
/* If we're off the left edge, return failure. */
|
||
ptr = cur->bc_ptrs[level];
|
||
if (ptr == 0) {
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
}
|
||
|
||
/* Make a key out of the record data to be inserted, and save it. */
|
||
cur->bc_ops->init_key_from_rec(&key, recp);
|
||
|
||
optr = ptr;
|
||
|
||
XFS_BTREE_STATS_INC(cur, insrec);
|
||
|
||
/* Get pointers to the btree buffer and block. */
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
numrecs = xfs_btree_get_numrecs(block);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, level, bp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/* Check that the new entry is being inserted in the right place. */
|
||
if (ptr <= numrecs) {
|
||
if (level == 0) {
|
||
ASSERT(cur->bc_ops->recs_inorder(cur, recp,
|
||
xfs_btree_rec_addr(cur, ptr, block)));
|
||
} else {
|
||
ASSERT(cur->bc_ops->keys_inorder(cur, &key,
|
||
xfs_btree_key_addr(cur, ptr, block)));
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/*
|
||
* If the block is full, we can't insert the new entry until we
|
||
* make the block un-full.
|
||
*/
|
||
xfs_btree_set_ptr_null(cur, &nptr);
|
||
if (numrecs == cur->bc_ops->get_maxrecs(cur, level)) {
|
||
error = xfs_btree_make_block_unfull(cur, level, numrecs,
|
||
&optr, &ptr, &nptr, &ncur, &nrec, stat);
|
||
if (error || *stat == 0)
|
||
goto error0;
|
||
}
|
||
|
||
/*
|
||
* The current block may have changed if the block was
|
||
* previously full and we have just made space in it.
|
||
*/
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
numrecs = xfs_btree_get_numrecs(block);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, level, bp);
|
||
if (error)
|
||
return error;
|
||
#endif
|
||
|
||
/*
|
||
* At this point we know there's room for our new entry in the block
|
||
* we're pointing at.
|
||
*/
|
||
XFS_BTREE_STATS_ADD(cur, moves, numrecs - ptr + 1);
|
||
|
||
if (level > 0) {
|
||
/* It's a nonleaf. make a hole in the keys and ptrs */
|
||
union xfs_btree_key *kp;
|
||
union xfs_btree_ptr *pp;
|
||
|
||
kp = xfs_btree_key_addr(cur, ptr, block);
|
||
pp = xfs_btree_ptr_addr(cur, ptr, block);
|
||
|
||
#ifdef DEBUG
|
||
for (i = numrecs - ptr; i >= 0; i--) {
|
||
error = xfs_btree_check_ptr(cur, pp, i, level);
|
||
if (error)
|
||
return error;
|
||
}
|
||
#endif
|
||
|
||
xfs_btree_shift_keys(cur, kp, 1, numrecs - ptr + 1);
|
||
xfs_btree_shift_ptrs(cur, pp, 1, numrecs - ptr + 1);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_ptr(cur, ptrp, 0, level);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
/* Now put the new data in, bump numrecs and log it. */
|
||
xfs_btree_copy_keys(cur, kp, &key, 1);
|
||
xfs_btree_copy_ptrs(cur, pp, ptrp, 1);
|
||
numrecs++;
|
||
xfs_btree_set_numrecs(block, numrecs);
|
||
xfs_btree_log_ptrs(cur, bp, ptr, numrecs);
|
||
xfs_btree_log_keys(cur, bp, ptr, numrecs);
|
||
#ifdef DEBUG
|
||
if (ptr < numrecs) {
|
||
ASSERT(cur->bc_ops->keys_inorder(cur, kp,
|
||
xfs_btree_key_addr(cur, ptr + 1, block)));
|
||
}
|
||
#endif
|
||
} else {
|
||
/* It's a leaf. make a hole in the records */
|
||
union xfs_btree_rec *rp;
|
||
|
||
rp = xfs_btree_rec_addr(cur, ptr, block);
|
||
|
||
xfs_btree_shift_recs(cur, rp, 1, numrecs - ptr + 1);
|
||
|
||
/* Now put the new data in, bump numrecs and log it. */
|
||
xfs_btree_copy_recs(cur, rp, recp, 1);
|
||
xfs_btree_set_numrecs(block, ++numrecs);
|
||
xfs_btree_log_recs(cur, bp, ptr, numrecs);
|
||
#ifdef DEBUG
|
||
if (ptr < numrecs) {
|
||
ASSERT(cur->bc_ops->recs_inorder(cur, rp,
|
||
xfs_btree_rec_addr(cur, ptr + 1, block)));
|
||
}
|
||
#endif
|
||
}
|
||
|
||
/* Log the new number of records in the btree header. */
|
||
xfs_btree_log_block(cur, bp, XFS_BB_NUMRECS);
|
||
|
||
/* If we inserted at the start of a block, update the parents' keys. */
|
||
if (optr == 1) {
|
||
error = xfs_btree_updkey(cur, &key, level + 1);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
|
||
/*
|
||
* If we are tracking the last record in the tree and
|
||
* we are at the far right edge of the tree, update it.
|
||
*/
|
||
if (xfs_btree_is_lastrec(cur, block, level)) {
|
||
cur->bc_ops->update_lastrec(cur, block, recp,
|
||
ptr, LASTREC_INSREC);
|
||
}
|
||
|
||
/*
|
||
* Return the new block number, if any.
|
||
* If there is one, give back a record value and a cursor too.
|
||
*/
|
||
*ptrp = nptr;
|
||
if (!xfs_btree_ptr_is_null(cur, &nptr)) {
|
||
*recp = nrec;
|
||
*curp = ncur;
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Insert the record at the point referenced by cur.
|
||
*
|
||
* A multi-level split of the tree on insert will invalidate the original
|
||
* cursor. All callers of this function should assume that the cursor is
|
||
* no longer valid and revalidate it.
|
||
*/
|
||
int
|
||
xfs_btree_insert(
|
||
struct xfs_btree_cur *cur,
|
||
int *stat)
|
||
{
|
||
int error; /* error return value */
|
||
int i; /* result value, 0 for failure */
|
||
int level; /* current level number in btree */
|
||
union xfs_btree_ptr nptr; /* new block number (split result) */
|
||
struct xfs_btree_cur *ncur; /* new cursor (split result) */
|
||
struct xfs_btree_cur *pcur; /* previous level's cursor */
|
||
union xfs_btree_rec rec; /* record to insert */
|
||
|
||
level = 0;
|
||
ncur = NULL;
|
||
pcur = cur;
|
||
|
||
xfs_btree_set_ptr_null(cur, &nptr);
|
||
cur->bc_ops->init_rec_from_cur(cur, &rec);
|
||
|
||
/*
|
||
* Loop going up the tree, starting at the leaf level.
|
||
* Stop when we don't get a split block, that must mean that
|
||
* the insert is finished with this level.
|
||
*/
|
||
do {
|
||
/*
|
||
* Insert nrec/nptr into this level of the tree.
|
||
* Note if we fail, nptr will be null.
|
||
*/
|
||
error = xfs_btree_insrec(pcur, level, &nptr, &rec, &ncur, &i);
|
||
if (error) {
|
||
if (pcur != cur)
|
||
xfs_btree_del_cursor(pcur, XFS_BTREE_ERROR);
|
||
goto error0;
|
||
}
|
||
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
level++;
|
||
|
||
/*
|
||
* See if the cursor we just used is trash.
|
||
* Can't trash the caller's cursor, but otherwise we should
|
||
* if ncur is a new cursor or we're about to be done.
|
||
*/
|
||
if (pcur != cur &&
|
||
(ncur || xfs_btree_ptr_is_null(cur, &nptr))) {
|
||
/* Save the state from the cursor before we trash it */
|
||
if (cur->bc_ops->update_cursor)
|
||
cur->bc_ops->update_cursor(pcur, cur);
|
||
cur->bc_nlevels = pcur->bc_nlevels;
|
||
xfs_btree_del_cursor(pcur, XFS_BTREE_NOERROR);
|
||
}
|
||
/* If we got a new cursor, switch to it. */
|
||
if (ncur) {
|
||
pcur = ncur;
|
||
ncur = NULL;
|
||
}
|
||
} while (!xfs_btree_ptr_is_null(cur, &nptr));
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = i;
|
||
return 0;
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Try to merge a non-leaf block back into the inode root.
|
||
*
|
||
* Note: the killroot names comes from the fact that we're effectively
|
||
* killing the old root block. But because we can't just delete the
|
||
* inode we have to copy the single block it was pointing to into the
|
||
* inode.
|
||
*/
|
||
STATIC int
|
||
xfs_btree_kill_iroot(
|
||
struct xfs_btree_cur *cur)
|
||
{
|
||
int whichfork = cur->bc_private.b.whichfork;
|
||
struct xfs_inode *ip = cur->bc_private.b.ip;
|
||
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
|
||
struct xfs_btree_block *block;
|
||
struct xfs_btree_block *cblock;
|
||
union xfs_btree_key *kp;
|
||
union xfs_btree_key *ckp;
|
||
union xfs_btree_ptr *pp;
|
||
union xfs_btree_ptr *cpp;
|
||
struct xfs_buf *cbp;
|
||
int level;
|
||
int index;
|
||
int numrecs;
|
||
#ifdef DEBUG
|
||
union xfs_btree_ptr ptr;
|
||
int i;
|
||
#endif
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
|
||
ASSERT(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE);
|
||
ASSERT(cur->bc_nlevels > 1);
|
||
|
||
/*
|
||
* Don't deal with the root block needs to be a leaf case.
|
||
* We're just going to turn the thing back into extents anyway.
|
||
*/
|
||
level = cur->bc_nlevels - 1;
|
||
if (level == 1)
|
||
goto out0;
|
||
|
||
/*
|
||
* Give up if the root has multiple children.
|
||
*/
|
||
block = xfs_btree_get_iroot(cur);
|
||
if (xfs_btree_get_numrecs(block) != 1)
|
||
goto out0;
|
||
|
||
cblock = xfs_btree_get_block(cur, level - 1, &cbp);
|
||
numrecs = xfs_btree_get_numrecs(cblock);
|
||
|
||
/*
|
||
* Only do this if the next level will fit.
|
||
* Then the data must be copied up to the inode,
|
||
* instead of freeing the root you free the next level.
|
||
*/
|
||
if (numrecs > cur->bc_ops->get_dmaxrecs(cur, level))
|
||
goto out0;
|
||
|
||
XFS_BTREE_STATS_INC(cur, killroot);
|
||
|
||
#ifdef DEBUG
|
||
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_LEFTSIB);
|
||
ASSERT(xfs_btree_ptr_is_null(cur, &ptr));
|
||
xfs_btree_get_sibling(cur, block, &ptr, XFS_BB_RIGHTSIB);
|
||
ASSERT(xfs_btree_ptr_is_null(cur, &ptr));
|
||
#endif
|
||
|
||
index = numrecs - cur->bc_ops->get_maxrecs(cur, level);
|
||
if (index) {
|
||
xfs_iroot_realloc(cur->bc_private.b.ip, index,
|
||
cur->bc_private.b.whichfork);
|
||
block = ifp->if_broot;
|
||
}
|
||
|
||
be16_add_cpu(&block->bb_numrecs, index);
|
||
ASSERT(block->bb_numrecs == cblock->bb_numrecs);
|
||
|
||
kp = xfs_btree_key_addr(cur, 1, block);
|
||
ckp = xfs_btree_key_addr(cur, 1, cblock);
|
||
xfs_btree_copy_keys(cur, kp, ckp, numrecs);
|
||
|
||
pp = xfs_btree_ptr_addr(cur, 1, block);
|
||
cpp = xfs_btree_ptr_addr(cur, 1, cblock);
|
||
#ifdef DEBUG
|
||
for (i = 0; i < numrecs; i++) {
|
||
int error;
|
||
|
||
error = xfs_btree_check_ptr(cur, cpp, i, level - 1);
|
||
if (error) {
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
}
|
||
#endif
|
||
xfs_btree_copy_ptrs(cur, pp, cpp, numrecs);
|
||
|
||
cur->bc_ops->free_block(cur, cbp);
|
||
XFS_BTREE_STATS_INC(cur, free);
|
||
|
||
cur->bc_bufs[level - 1] = NULL;
|
||
be16_add_cpu(&block->bb_level, -1);
|
||
xfs_trans_log_inode(cur->bc_tp, ip,
|
||
XFS_ILOG_CORE | xfs_ilog_fbroot(cur->bc_private.b.whichfork));
|
||
cur->bc_nlevels--;
|
||
out0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
return 0;
|
||
}
|
||
|
||
STATIC int
|
||
xfs_btree_dec_cursor(
|
||
struct xfs_btree_cur *cur,
|
||
int level,
|
||
int *stat)
|
||
{
|
||
int error;
|
||
int i;
|
||
|
||
if (level > 0) {
|
||
error = xfs_btree_decrement(cur, level, &i);
|
||
if (error)
|
||
return error;
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Single level of the btree record deletion routine.
|
||
* Delete record pointed to by cur/level.
|
||
* Remove the record from its block then rebalance the tree.
|
||
* Return 0 for error, 1 for done, 2 to go on to the next level.
|
||
*/
|
||
STATIC int /* error */
|
||
xfs_btree_delrec(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
int level, /* level removing record from */
|
||
int *stat) /* fail/done/go-on */
|
||
{
|
||
struct xfs_btree_block *block; /* btree block */
|
||
union xfs_btree_ptr cptr; /* current block ptr */
|
||
struct xfs_buf *bp; /* buffer for block */
|
||
int error; /* error return value */
|
||
int i; /* loop counter */
|
||
union xfs_btree_key key; /* storage for keyp */
|
||
union xfs_btree_key *keyp = &key; /* passed to the next level */
|
||
union xfs_btree_ptr lptr; /* left sibling block ptr */
|
||
struct xfs_buf *lbp; /* left buffer pointer */
|
||
struct xfs_btree_block *left; /* left btree block */
|
||
int lrecs = 0; /* left record count */
|
||
int ptr; /* key/record index */
|
||
union xfs_btree_ptr rptr; /* right sibling block ptr */
|
||
struct xfs_buf *rbp; /* right buffer pointer */
|
||
struct xfs_btree_block *right; /* right btree block */
|
||
struct xfs_btree_block *rrblock; /* right-right btree block */
|
||
struct xfs_buf *rrbp; /* right-right buffer pointer */
|
||
int rrecs = 0; /* right record count */
|
||
struct xfs_btree_cur *tcur; /* temporary btree cursor */
|
||
int numrecs; /* temporary numrec count */
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
XFS_BTREE_TRACE_ARGI(cur, level);
|
||
|
||
tcur = NULL;
|
||
|
||
/* Get the index of the entry being deleted, check for nothing there. */
|
||
ptr = cur->bc_ptrs[level];
|
||
if (ptr == 0) {
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
}
|
||
|
||
/* Get the buffer & block containing the record or key/ptr. */
|
||
block = xfs_btree_get_block(cur, level, &bp);
|
||
numrecs = xfs_btree_get_numrecs(block);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, level, bp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
|
||
/* Fail if we're off the end of the block. */
|
||
if (ptr > numrecs) {
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 0;
|
||
return 0;
|
||
}
|
||
|
||
XFS_BTREE_STATS_INC(cur, delrec);
|
||
XFS_BTREE_STATS_ADD(cur, moves, numrecs - ptr);
|
||
|
||
/* Excise the entries being deleted. */
|
||
if (level > 0) {
|
||
/* It's a nonleaf. operate on keys and ptrs */
|
||
union xfs_btree_key *lkp;
|
||
union xfs_btree_ptr *lpp;
|
||
|
||
lkp = xfs_btree_key_addr(cur, ptr + 1, block);
|
||
lpp = xfs_btree_ptr_addr(cur, ptr + 1, block);
|
||
|
||
#ifdef DEBUG
|
||
for (i = 0; i < numrecs - ptr; i++) {
|
||
error = xfs_btree_check_ptr(cur, lpp, i, level);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
#endif
|
||
|
||
if (ptr < numrecs) {
|
||
xfs_btree_shift_keys(cur, lkp, -1, numrecs - ptr);
|
||
xfs_btree_shift_ptrs(cur, lpp, -1, numrecs - ptr);
|
||
xfs_btree_log_keys(cur, bp, ptr, numrecs - 1);
|
||
xfs_btree_log_ptrs(cur, bp, ptr, numrecs - 1);
|
||
}
|
||
|
||
/*
|
||
* If it's the first record in the block, we'll need to pass a
|
||
* key up to the next level (updkey).
|
||
*/
|
||
if (ptr == 1)
|
||
keyp = xfs_btree_key_addr(cur, 1, block);
|
||
} else {
|
||
/* It's a leaf. operate on records */
|
||
if (ptr < numrecs) {
|
||
xfs_btree_shift_recs(cur,
|
||
xfs_btree_rec_addr(cur, ptr + 1, block),
|
||
-1, numrecs - ptr);
|
||
xfs_btree_log_recs(cur, bp, ptr, numrecs - 1);
|
||
}
|
||
|
||
/*
|
||
* If it's the first record in the block, we'll need a key
|
||
* structure to pass up to the next level (updkey).
|
||
*/
|
||
if (ptr == 1) {
|
||
cur->bc_ops->init_key_from_rec(&key,
|
||
xfs_btree_rec_addr(cur, 1, block));
|
||
keyp = &key;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Decrement and log the number of entries in the block.
|
||
*/
|
||
xfs_btree_set_numrecs(block, --numrecs);
|
||
xfs_btree_log_block(cur, bp, XFS_BB_NUMRECS);
|
||
|
||
/*
|
||
* If we are tracking the last record in the tree and
|
||
* we are at the far right edge of the tree, update it.
|
||
*/
|
||
if (xfs_btree_is_lastrec(cur, block, level)) {
|
||
cur->bc_ops->update_lastrec(cur, block, NULL,
|
||
ptr, LASTREC_DELREC);
|
||
}
|
||
|
||
/*
|
||
* We're at the root level. First, shrink the root block in-memory.
|
||
* Try to get rid of the next level down. If we can't then there's
|
||
* nothing left to do.
|
||
*/
|
||
if (level == cur->bc_nlevels - 1) {
|
||
if (cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) {
|
||
xfs_iroot_realloc(cur->bc_private.b.ip, -1,
|
||
cur->bc_private.b.whichfork);
|
||
|
||
error = xfs_btree_kill_iroot(cur);
|
||
if (error)
|
||
goto error0;
|
||
|
||
error = xfs_btree_dec_cursor(cur, level, stat);
|
||
if (error)
|
||
goto error0;
|
||
*stat = 1;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* If this is the root level, and there's only one entry left,
|
||
* and it's NOT the leaf level, then we can get rid of this
|
||
* level.
|
||
*/
|
||
if (numrecs == 1 && level > 0) {
|
||
union xfs_btree_ptr *pp;
|
||
/*
|
||
* pp is still set to the first pointer in the block.
|
||
* Make it the new root of the btree.
|
||
*/
|
||
pp = xfs_btree_ptr_addr(cur, 1, block);
|
||
error = cur->bc_ops->kill_root(cur, bp, level, pp);
|
||
if (error)
|
||
goto error0;
|
||
} else if (level > 0) {
|
||
error = xfs_btree_dec_cursor(cur, level, stat);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
*stat = 1;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* If we deleted the leftmost entry in the block, update the
|
||
* key values above us in the tree.
|
||
*/
|
||
if (ptr == 1) {
|
||
error = xfs_btree_updkey(cur, keyp, level + 1);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
|
||
/*
|
||
* If the number of records remaining in the block is at least
|
||
* the minimum, we're done.
|
||
*/
|
||
if (numrecs >= cur->bc_ops->get_minrecs(cur, level)) {
|
||
error = xfs_btree_dec_cursor(cur, level, stat);
|
||
if (error)
|
||
goto error0;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Otherwise, we have to move some records around to keep the
|
||
* tree balanced. Look at the left and right sibling blocks to
|
||
* see if we can re-balance by moving only one record.
|
||
*/
|
||
xfs_btree_get_sibling(cur, block, &rptr, XFS_BB_RIGHTSIB);
|
||
xfs_btree_get_sibling(cur, block, &lptr, XFS_BB_LEFTSIB);
|
||
|
||
if (cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) {
|
||
/*
|
||
* One child of root, need to get a chance to copy its contents
|
||
* into the root and delete it. Can't go up to next level,
|
||
* there's nothing to delete there.
|
||
*/
|
||
if (xfs_btree_ptr_is_null(cur, &rptr) &&
|
||
xfs_btree_ptr_is_null(cur, &lptr) &&
|
||
level == cur->bc_nlevels - 2) {
|
||
error = xfs_btree_kill_iroot(cur);
|
||
if (!error)
|
||
error = xfs_btree_dec_cursor(cur, level, stat);
|
||
if (error)
|
||
goto error0;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
ASSERT(!xfs_btree_ptr_is_null(cur, &rptr) ||
|
||
!xfs_btree_ptr_is_null(cur, &lptr));
|
||
|
||
/*
|
||
* Duplicate the cursor so our btree manipulations here won't
|
||
* disrupt the next level up.
|
||
*/
|
||
error = xfs_btree_dup_cursor(cur, &tcur);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/*
|
||
* If there's a right sibling, see if it's ok to shift an entry
|
||
* out of it.
|
||
*/
|
||
if (!xfs_btree_ptr_is_null(cur, &rptr)) {
|
||
/*
|
||
* Move the temp cursor to the last entry in the next block.
|
||
* Actually any entry but the first would suffice.
|
||
*/
|
||
i = xfs_btree_lastrec(tcur, level);
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
|
||
error = xfs_btree_increment(tcur, level, &i);
|
||
if (error)
|
||
goto error0;
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
|
||
i = xfs_btree_lastrec(tcur, level);
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
|
||
/* Grab a pointer to the block. */
|
||
right = xfs_btree_get_block(tcur, level, &rbp);
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(tcur, right, level, rbp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
/* Grab the current block number, for future use. */
|
||
xfs_btree_get_sibling(tcur, right, &cptr, XFS_BB_LEFTSIB);
|
||
|
||
/*
|
||
* If right block is full enough so that removing one entry
|
||
* won't make it too empty, and left-shifting an entry out
|
||
* of right to us works, we're done.
|
||
*/
|
||
if (xfs_btree_get_numrecs(right) - 1 >=
|
||
cur->bc_ops->get_minrecs(tcur, level)) {
|
||
error = xfs_btree_lshift(tcur, level, &i);
|
||
if (error)
|
||
goto error0;
|
||
if (i) {
|
||
ASSERT(xfs_btree_get_numrecs(block) >=
|
||
cur->bc_ops->get_minrecs(tcur, level));
|
||
|
||
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
||
tcur = NULL;
|
||
|
||
error = xfs_btree_dec_cursor(cur, level, stat);
|
||
if (error)
|
||
goto error0;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Otherwise, grab the number of records in right for
|
||
* future reference, and fix up the temp cursor to point
|
||
* to our block again (last record).
|
||
*/
|
||
rrecs = xfs_btree_get_numrecs(right);
|
||
if (!xfs_btree_ptr_is_null(cur, &lptr)) {
|
||
i = xfs_btree_firstrec(tcur, level);
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
|
||
error = xfs_btree_decrement(tcur, level, &i);
|
||
if (error)
|
||
goto error0;
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* If there's a left sibling, see if it's ok to shift an entry
|
||
* out of it.
|
||
*/
|
||
if (!xfs_btree_ptr_is_null(cur, &lptr)) {
|
||
/*
|
||
* Move the temp cursor to the first entry in the
|
||
* previous block.
|
||
*/
|
||
i = xfs_btree_firstrec(tcur, level);
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
|
||
error = xfs_btree_decrement(tcur, level, &i);
|
||
if (error)
|
||
goto error0;
|
||
i = xfs_btree_firstrec(tcur, level);
|
||
XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
|
||
|
||
/* Grab a pointer to the block. */
|
||
left = xfs_btree_get_block(tcur, level, &lbp);
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, left, level, lbp);
|
||
if (error)
|
||
goto error0;
|
||
#endif
|
||
/* Grab the current block number, for future use. */
|
||
xfs_btree_get_sibling(tcur, left, &cptr, XFS_BB_RIGHTSIB);
|
||
|
||
/*
|
||
* If left block is full enough so that removing one entry
|
||
* won't make it too empty, and right-shifting an entry out
|
||
* of left to us works, we're done.
|
||
*/
|
||
if (xfs_btree_get_numrecs(left) - 1 >=
|
||
cur->bc_ops->get_minrecs(tcur, level)) {
|
||
error = xfs_btree_rshift(tcur, level, &i);
|
||
if (error)
|
||
goto error0;
|
||
if (i) {
|
||
ASSERT(xfs_btree_get_numrecs(block) >=
|
||
cur->bc_ops->get_minrecs(tcur, level));
|
||
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
||
tcur = NULL;
|
||
if (level == 0)
|
||
cur->bc_ptrs[0]++;
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = 1;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Otherwise, grab the number of records in right for
|
||
* future reference.
|
||
*/
|
||
lrecs = xfs_btree_get_numrecs(left);
|
||
}
|
||
|
||
/* Delete the temp cursor, we're done with it. */
|
||
xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
|
||
tcur = NULL;
|
||
|
||
/* If here, we need to do a join to keep the tree balanced. */
|
||
ASSERT(!xfs_btree_ptr_is_null(cur, &cptr));
|
||
|
||
if (!xfs_btree_ptr_is_null(cur, &lptr) &&
|
||
lrecs + xfs_btree_get_numrecs(block) <=
|
||
cur->bc_ops->get_maxrecs(cur, level)) {
|
||
/*
|
||
* Set "right" to be the starting block,
|
||
* "left" to be the left neighbor.
|
||
*/
|
||
rptr = cptr;
|
||
right = block;
|
||
rbp = bp;
|
||
error = xfs_btree_read_buf_block(cur, &lptr, level,
|
||
0, &left, &lbp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/*
|
||
* If that won't work, see if we can join with the right neighbor block.
|
||
*/
|
||
} else if (!xfs_btree_ptr_is_null(cur, &rptr) &&
|
||
rrecs + xfs_btree_get_numrecs(block) <=
|
||
cur->bc_ops->get_maxrecs(cur, level)) {
|
||
/*
|
||
* Set "left" to be the starting block,
|
||
* "right" to be the right neighbor.
|
||
*/
|
||
lptr = cptr;
|
||
left = block;
|
||
lbp = bp;
|
||
error = xfs_btree_read_buf_block(cur, &rptr, level,
|
||
0, &right, &rbp);
|
||
if (error)
|
||
goto error0;
|
||
|
||
/*
|
||
* Otherwise, we can't fix the imbalance.
|
||
* Just return. This is probably a logic error, but it's not fatal.
|
||
*/
|
||
} else {
|
||
error = xfs_btree_dec_cursor(cur, level, stat);
|
||
if (error)
|
||
goto error0;
|
||
return 0;
|
||
}
|
||
|
||
rrecs = xfs_btree_get_numrecs(right);
|
||
lrecs = xfs_btree_get_numrecs(left);
|
||
|
||
/*
|
||
* We're now going to join "left" and "right" by moving all the stuff
|
||
* in "right" to "left" and deleting "right".
|
||
*/
|
||
XFS_BTREE_STATS_ADD(cur, moves, rrecs);
|
||
if (level > 0) {
|
||
/* It's a non-leaf. Move keys and pointers. */
|
||
union xfs_btree_key *lkp; /* left btree key */
|
||
union xfs_btree_ptr *lpp; /* left address pointer */
|
||
union xfs_btree_key *rkp; /* right btree key */
|
||
union xfs_btree_ptr *rpp; /* right address pointer */
|
||
|
||
lkp = xfs_btree_key_addr(cur, lrecs + 1, left);
|
||
lpp = xfs_btree_ptr_addr(cur, lrecs + 1, left);
|
||
rkp = xfs_btree_key_addr(cur, 1, right);
|
||
rpp = xfs_btree_ptr_addr(cur, 1, right);
|
||
#ifdef DEBUG
|
||
for (i = 1; i < rrecs; i++) {
|
||
error = xfs_btree_check_ptr(cur, rpp, i, level);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
#endif
|
||
xfs_btree_copy_keys(cur, lkp, rkp, rrecs);
|
||
xfs_btree_copy_ptrs(cur, lpp, rpp, rrecs);
|
||
|
||
xfs_btree_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
|
||
xfs_btree_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
|
||
} else {
|
||
/* It's a leaf. Move records. */
|
||
union xfs_btree_rec *lrp; /* left record pointer */
|
||
union xfs_btree_rec *rrp; /* right record pointer */
|
||
|
||
lrp = xfs_btree_rec_addr(cur, lrecs + 1, left);
|
||
rrp = xfs_btree_rec_addr(cur, 1, right);
|
||
|
||
xfs_btree_copy_recs(cur, lrp, rrp, rrecs);
|
||
xfs_btree_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs);
|
||
}
|
||
|
||
XFS_BTREE_STATS_INC(cur, join);
|
||
|
||
/*
|
||
* Fix up the number of records and right block pointer in the
|
||
* surviving block, and log it.
|
||
*/
|
||
xfs_btree_set_numrecs(left, lrecs + rrecs);
|
||
xfs_btree_get_sibling(cur, right, &cptr, XFS_BB_RIGHTSIB),
|
||
xfs_btree_set_sibling(cur, left, &cptr, XFS_BB_RIGHTSIB);
|
||
xfs_btree_log_block(cur, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
|
||
|
||
/* If there is a right sibling, point it to the remaining block. */
|
||
xfs_btree_get_sibling(cur, left, &cptr, XFS_BB_RIGHTSIB);
|
||
if (!xfs_btree_ptr_is_null(cur, &cptr)) {
|
||
error = xfs_btree_read_buf_block(cur, &cptr, level,
|
||
0, &rrblock, &rrbp);
|
||
if (error)
|
||
goto error0;
|
||
xfs_btree_set_sibling(cur, rrblock, &lptr, XFS_BB_LEFTSIB);
|
||
xfs_btree_log_block(cur, rrbp, XFS_BB_LEFTSIB);
|
||
}
|
||
|
||
/* Free the deleted block. */
|
||
error = cur->bc_ops->free_block(cur, rbp);
|
||
if (error)
|
||
goto error0;
|
||
XFS_BTREE_STATS_INC(cur, free);
|
||
|
||
/*
|
||
* If we joined with the left neighbor, set the buffer in the
|
||
* cursor to the left block, and fix up the index.
|
||
*/
|
||
if (bp != lbp) {
|
||
cur->bc_bufs[level] = lbp;
|
||
cur->bc_ptrs[level] += lrecs;
|
||
cur->bc_ra[level] = 0;
|
||
}
|
||
/*
|
||
* If we joined with the right neighbor and there's a level above
|
||
* us, increment the cursor at that level.
|
||
*/
|
||
else if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) ||
|
||
(level + 1 < cur->bc_nlevels)) {
|
||
error = xfs_btree_increment(cur, level + 1, &i);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
|
||
/*
|
||
* Readjust the ptr at this level if it's not a leaf, since it's
|
||
* still pointing at the deletion point, which makes the cursor
|
||
* inconsistent. If this makes the ptr 0, the caller fixes it up.
|
||
* We can't use decrement because it would change the next level up.
|
||
*/
|
||
if (level > 0)
|
||
cur->bc_ptrs[level]--;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
/* Return value means the next level up has something to do. */
|
||
*stat = 2;
|
||
return 0;
|
||
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
if (tcur)
|
||
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Delete the record pointed to by cur.
|
||
* The cursor refers to the place where the record was (could be inserted)
|
||
* when the operation returns.
|
||
*/
|
||
int /* error */
|
||
xfs_btree_delete(
|
||
struct xfs_btree_cur *cur,
|
||
int *stat) /* success/failure */
|
||
{
|
||
int error; /* error return value */
|
||
int level;
|
||
int i;
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
|
||
|
||
/*
|
||
* Go up the tree, starting at leaf level.
|
||
*
|
||
* If 2 is returned then a join was done; go to the next level.
|
||
* Otherwise we are done.
|
||
*/
|
||
for (level = 0, i = 2; i == 2; level++) {
|
||
error = xfs_btree_delrec(cur, level, &i);
|
||
if (error)
|
||
goto error0;
|
||
}
|
||
|
||
if (i == 0) {
|
||
for (level = 1; level < cur->bc_nlevels; level++) {
|
||
if (cur->bc_ptrs[level] == 0) {
|
||
error = xfs_btree_decrement(cur, level, &i);
|
||
if (error)
|
||
goto error0;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
|
||
*stat = i;
|
||
return 0;
|
||
error0:
|
||
XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
|
||
return error;
|
||
}
|
||
|
||
/*
|
||
* Get the data from the pointed-to record.
|
||
*/
|
||
int /* error */
|
||
xfs_btree_get_rec(
|
||
struct xfs_btree_cur *cur, /* btree cursor */
|
||
union xfs_btree_rec **recp, /* output: btree record */
|
||
int *stat) /* output: success/failure */
|
||
{
|
||
struct xfs_btree_block *block; /* btree block */
|
||
struct xfs_buf *bp; /* buffer pointer */
|
||
int ptr; /* record number */
|
||
#ifdef DEBUG
|
||
int error; /* error return value */
|
||
#endif
|
||
|
||
ptr = cur->bc_ptrs[0];
|
||
block = xfs_btree_get_block(cur, 0, &bp);
|
||
|
||
#ifdef DEBUG
|
||
error = xfs_btree_check_block(cur, block, 0, bp);
|
||
if (error)
|
||
return error;
|
||
#endif
|
||
|
||
/*
|
||
* Off the right end or left end, return failure.
|
||
*/
|
||
if (ptr > xfs_btree_get_numrecs(block) || ptr <= 0) {
|
||
*stat = 0;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* Point to the record and extract its data.
|
||
*/
|
||
*recp = xfs_btree_rec_addr(cur, ptr, block);
|
||
*stat = 1;
|
||
return 0;
|
||
}
|