xfs: encapsulate a block of debug code

Pull into a helper function some debug-only code that validates a
xfs_da_blkinfo structure that's been read from disk.

Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Christoph Hellwig <hch@infradead.org>

diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c
index 2925726..5bfcb87 100644 (file)
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -692,6 +692,24 @@ xfs_da_join(xfs_da_state_t *state)
        return(error);
 }
 
+#ifdef DEBUG
+static void
+xfs_da_blkinfo_onlychild_validate(struct xfs_da_blkinfo *blkinfo, __u16 level)
+{
+       __be16  magic = blkinfo->magic;
+
+       if (level == 1) {
+               ASSERT(magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
+                      magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
+       } else
+               ASSERT(magic == cpu_to_be16(XFS_DA_NODE_MAGIC));
+       ASSERT(!blkinfo->forw);
+       ASSERT(!blkinfo->back);
+}
+#else  /* !DEBUG */
+#define        xfs_da_blkinfo_onlychild_validate(blkinfo, level)
+#endif /* !DEBUG */
+
 /*
  * We have only one entry in the root.  Copy the only remaining child of
  * the old root to block 0 as the new root node.
@@ -700,8 +718,6 @@ STATIC int
 xfs_da_root_join(xfs_da_state_t *state, xfs_da_state_blk_t *root_blk)
 {
        xfs_da_intnode_t *oldroot;
-       /* REFERENCED */
-       xfs_da_blkinfo_t *blkinfo;
        xfs_da_args_t *args;
        xfs_dablk_t child;
        xfs_dabuf_t *bp;
@@ -732,15 +748,9 @@ xfs_da_root_join(xfs_da_state_t *state, xfs_da_state_blk_t *root_blk)
        if (error)
                return(error);
        ASSERT(bp != NULL);
-       blkinfo = bp->data;
-       if (be16_to_cpu(oldroot->hdr.level) == 1) {
-               ASSERT(blkinfo->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
-                      blkinfo->magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
-       } else {
-               ASSERT(blkinfo->magic == cpu_to_be16(XFS_DA_NODE_MAGIC));
-       }
-       ASSERT(!blkinfo->forw);
-       ASSERT(!blkinfo->back);
+       xfs_da_blkinfo_onlychild_validate(bp->data,
+                                       be16_to_cpu(oldroot->hdr.level));
+
        memcpy(root_blk->bp->data, bp->data, state->blocksize);
        xfs_da_log_buf(args->trans, root_blk->bp, 0, state->blocksize - 1);
        error = xfs_da_shrink_inode(args, child, bp);