xfs: create a new buf_ops pointer to verify structure metadata

Expose all metadata structure buffer verifier functions via buf_ops.
These will be used by the online scrub mechanism to look for problems
with buffers that are already sitting around in memory.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/xfs/libxfs/xfs_dquot_buf.c b/fs/xfs/libxfs/xfs_dquot_buf.c
index 5e022c1..f8b62fc 100644
--- a/fs/xfs/libxfs/xfs_dquot_buf.c
+++ b/fs/xfs/libxfs/xfs_dquot_buf.c
@@ -242,6 +242,17 @@ xfs_dquot_buf_verify(
 	return true;
 }
 
+static xfs_failaddr_t
+xfs_dquot_buf_verify_struct(
+	struct xfs_buf	*bp)
+{
+	struct xfs_mount	*mp = bp->b_target->bt_mount;
+
+	if (!xfs_dquot_buf_verify(mp, bp, 0))
+		return __this_address;
+	return NULL;
+}
+
 static void
 xfs_dquot_buf_read_verify(
 	struct xfs_buf	*bp)
@@ -294,6 +305,7 @@ const struct xfs_buf_ops xfs_dquot_buf_ops = {
 	.name = "xfs_dquot",
 	.verify_read = xfs_dquot_buf_read_verify,
 	.verify_write = xfs_dquot_buf_write_verify,
+	.verify_struct = xfs_dquot_buf_verify_struct,
 };
 
 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {