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libxfs: refactor short btree block verification 

Create xfs_btree_sblock_verify() to verify short-format btree blocks
(i.e. the per-AG btrees with 32-bit block pointers) instead of
open-coding them.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-01-04 16:13:21 +11:00 committed by Dave Chinner
parent 96f859d52b
commit c5ab131ba0
4 changed files with 67 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
fs/xfs/libxfs/xfs_alloc_btree.c
View File

@ -293,14 +293,7 @@ xfs_allocbt_verify(
level = be16_to_cpu(block->bb_level);
switch (block->bb_magic) {
case cpu_to_be32(XFS_ABTB_CRC_MAGIC):
if (!xfs_sb_version_hascrc(&mp->m_sb))
return false;
if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
return false;
if (pag &&
be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
if (!xfs_btree_sblock_v5hdr_verify(bp))
return false;
/* fall through */
case cpu_to_be32(XFS_ABTB_MAGIC):
@ -311,14 +304,7 @@ xfs_allocbt_verify(
return false;
break;
case cpu_to_be32(XFS_ABTC_CRC_MAGIC):
if (!xfs_sb_version_hascrc(&mp->m_sb))
return false;
if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
return false;
if (pag &&
be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
if (!xfs_btree_sblock_v5hdr_verify(bp))
return false;
/* fall through */
case cpu_to_be32(XFS_ABTC_MAGIC):
@ -332,21 +318,7 @@ xfs_allocbt_verify(
return false;
}
/* numrecs verification */
if (be16_to_cpu(block->bb_numrecs) > mp->m_alloc_mxr[level != 0])
return false;
/* sibling pointer verification */
if (!block->bb_u.s.bb_leftsib ||
(be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks &&
block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK)))
return false;
if (!block->bb_u.s.bb_rightsib ||
(be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks &&
block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK)))
return false;
return true;
return xfs_btree_sblock_verify(bp, mp->m_alloc_mxr[level != 0]);
}
static void

58
fs/xfs/libxfs/xfs_btree.c
View File

@ -4080,3 +4080,61 @@ xfs_btree_change_owner(
return 0;
}
/**
* xfs_btree_sblock_v5hdr_verify() -- verify the v5 fields of a short-format
* btree block
*
* @bp: buffer containing the btree block
* @max_recs: pointer to the m_*_mxr max records field in the xfs mount
* @pag_max_level: pointer to the per-ag max level field
*/
bool
xfs_btree_sblock_v5hdr_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
struct xfs_perag *pag = bp->b_pag;
if (!xfs_sb_version_hascrc(&mp->m_sb))
return false;
if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
return false;
if (pag && be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
return false;
return true;
}
/**
* xfs_btree_sblock_verify() -- verify a short-format btree block
*
* @bp: buffer containing the btree block
* @max_recs: maximum records allowed in this btree node
*/
bool
xfs_btree_sblock_verify(
struct xfs_buf *bp,
unsigned int max_recs)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
/* numrecs verification */
if (be16_to_cpu(block->bb_numrecs) > max_recs)
return false;
/* sibling pointer verification */
if (!block->bb_u.s.bb_leftsib ||
(be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks &&
block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK)))
return false;
if (!block->bb_u.s.bb_rightsib ||
(be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks &&
block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK)))
return false;
return true;
}

3
fs/xfs/libxfs/xfs_btree.h
View File

@ -472,4 +472,7 @@ static inline int xfs_btree_get_level(struct xfs_btree_block *block)
#define XFS_BTREE_TRACE_ARGR(c, r)
#define XFS_BTREE_TRACE_CURSOR(c, t)
bool xfs_btree_sblock_v5hdr_verify(struct xfs_buf *bp);
bool xfs_btree_sblock_verify(struct xfs_buf *bp, unsigned int max_recs);
#endif /* __XFS_BTREE_H__ */

26
fs/xfs/libxfs/xfs_ialloc_btree.c
View File

@ -221,7 +221,6 @@ xfs_inobt_verify(
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
struct xfs_perag *pag = bp->b_pag;
unsigned int level;
/*
@ -237,14 +236,7 @@ xfs_inobt_verify(
switch (block->bb_magic) {
case cpu_to_be32(XFS_IBT_CRC_MAGIC):
case cpu_to_be32(XFS_FIBT_CRC_MAGIC):
if (!xfs_sb_version_hascrc(&mp->m_sb))
return false;
if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
return false;
if (pag &&
be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
if (!xfs_btree_sblock_v5hdr_verify(bp))
return false;
/* fall through */
case cpu_to_be32(XFS_IBT_MAGIC):
@ -254,24 +246,12 @@ xfs_inobt_verify(
return 0;
}
/* numrecs and level verification */
/* level verification */
level = be16_to_cpu(block->bb_level);
if (level >= mp->m_in_maxlevels)
return false;
if (be16_to_cpu(block->bb_numrecs) > mp->m_inobt_mxr[level != 0])
return false;
/* sibling pointer verification */
if (!block->bb_u.s.bb_leftsib ||
(be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks &&
block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK)))
return false;
if (!block->bb_u.s.bb_rightsib ||
(be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks &&
block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK)))
return false;
return true;
return xfs_btree_sblock_verify(bp, mp->m_inobt_mxr[level != 0]);
}
static void