From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Create two helper functions to verify the headers of a long format
btree block. We'll use this later for the realtime rmapbt.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_bmap_btree.c | 22 ++------------------
fs/xfs/libxfs/xfs_btree.c | 45 ++++++++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_btree.h | 3 +++
3 files changed, 50 insertions(+), 20 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c
index 00472e1..862be9c 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -435,17 +435,11 @@ xfs_bmbt_verify(
switch (block->bb_magic) {
case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
- if (!xfs_sb_version_hascrc(&mp->m_sb))
- return false;
- if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
- return false;
- if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
- return false;
/*
* XXX: need a better way of verifying the owner here. Right now
* just make sure there has been one set.
*/
- if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
+ if (!xfs_btree_lblock_v5hdr_verify(bp, XFS_RMAP_OWN_UNKNOWN))
return false;
/* fall through */
case cpu_to_be32(XFS_BMAP_MAGIC):
@@ -464,20 +458,8 @@ xfs_bmbt_verify(
level = be16_to_cpu(block->bb_level);
if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
return false;
- if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
- return false;
-
- /* sibling pointer verification */
- if (!block->bb_u.l.bb_leftsib ||
- (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
- !xfs_verify_fsbno(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
- return false;
- if (!block->bb_u.l.bb_rightsib ||
- (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
- !xfs_verify_fsbno(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
- return false;
- return true;
+ return xfs_btree_lblock_verify(bp, mp->m_bmap_dmxr[level != 0]);
}
static void
diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
index 5a6146e..d84fdcb 100644
--- a/fs/xfs/libxfs/xfs_btree.c
+++ b/fs/xfs/libxfs/xfs_btree.c
@@ -4529,6 +4529,51 @@ xfs_btree_change_owner(
&bbcoi);
}
+/* Verify the v5 fields of a long-format btree block. */
+bool
+xfs_btree_lblock_v5hdr_verify(
+ struct xfs_buf *bp,
+ uint64_t owner)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
+
+ if (!xfs_sb_version_hascrc(&mp->m_sb))
+ return false;
+ if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
+ return false;
+ if (block->bb_u.l.bb_blkno != cpu_to_be64(bp->b_bn))
+ return false;
+ if (owner != XFS_RMAP_OWN_UNKNOWN &&
+ be64_to_cpu(block->bb_u.l.bb_owner) != owner)
+ return false;
+ return true;
+}
+
+/* Verify a long-format btree block. */
+bool
+xfs_btree_lblock_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.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
+ !xfs_verify_fsbno(mp, be64_to_cpu(block->bb_u.l.bb_leftsib)))
+ return false;
+ if (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
+ !xfs_verify_fsbno(mp, be64_to_cpu(block->bb_u.l.bb_rightsib)))
+ return false;
+
+ return true;
+}
+
/**
* xfs_btree_sblock_v5hdr_verify() -- verify the v5 fields of a short-format
* btree block
diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index 8a263ea..6bf79ad 100644
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -494,6 +494,9 @@ static inline int xfs_btree_get_level(struct xfs_btree_block *block)
bool xfs_btree_sblock_v5hdr_verify(struct xfs_buf *bp);
bool xfs_btree_sblock_verify(struct xfs_buf *bp, unsigned int max_recs);
+bool xfs_btree_lblock_v5hdr_verify(struct xfs_buf *bp, uint64_t owner);
+bool xfs_btree_lblock_verify(struct xfs_buf *bp, unsigned int max_recs);
+
uint xfs_btree_compute_maxlevels(struct xfs_mount *mp, uint *limits,
unsigned long len);
xfs_extlen_t xfs_btree_calc_size(struct xfs_mount *mp, uint *limits,
--
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