xfs: fix xfs_buf magic number endian checks
Create a separate magic16 check function so that we don't run afoul of
static checkers.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 52a382b..548344e2 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -2213,7 +2213,7 @@ void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref)
bool
xfs_verify_magic(
struct xfs_buf *bp,
- uint32_t dmagic)
+ __be32 dmagic)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
int idx;
@@ -2223,3 +2223,21 @@ xfs_verify_magic(
return false;
return dmagic == bp->b_ops->magic[idx];
}
+/*
+ * Verify an on-disk magic value against the magic value specified in the
+ * verifier structure. The verifier magic is in disk byte order so the caller is
+ * expected to pass the value directly from disk.
+ */
+bool
+xfs_verify_magic16(
+ struct xfs_buf *bp,
+ __be16 dmagic)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ int idx;
+
+ idx = xfs_sb_version_hascrc(&mp->m_sb);
+ if (unlikely(WARN_ON(!bp->b_ops || !bp->b_ops->magic16[idx])))
+ return false;
+ return dmagic == bp->b_ops->magic16[idx];
+}
