xfs_metadump: Extend data zapping to XFS_DIR{2,3}_LEAFN_MAGIC blocks

Signed-off-by: Stefan Ring <stefanrin@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
diff --git a/db/metadump.c b/db/metadump.c
index 8b8e472..22cdb9f 100644
--- a/db/metadump.c
+++ b/db/metadump.c
@@ -1426,7 +1426,7 @@
 	char				*block)
 {
 	struct xfs_dir2_leaf		*leaf;
-	struct xfs_dir3_icleaf_hdr 	leafhdr;
+	struct xfs_dir3_icleaf_hdr	leafhdr;
 
 	if (!zero_stale_data)
 		return;
@@ -1435,20 +1435,39 @@
 	leaf = (struct xfs_dir2_leaf *)block;
 	M_DIROPS(mp)->leaf_hdr_from_disk(&leafhdr, leaf);
 
-	/* Zero out space from end of ents[] to bests */
-	if (leafhdr.magic == XFS_DIR2_LEAF1_MAGIC ||
-	    leafhdr.magic == XFS_DIR3_LEAF1_MAGIC) {
+	switch (leafhdr.magic) {
+	case XFS_DIR2_LEAF1_MAGIC:
+	case XFS_DIR3_LEAF1_MAGIC: {
 		struct xfs_dir2_leaf_tail	*ltp;
 		__be16				*lbp;
 		struct xfs_dir2_leaf_entry	*ents;
 		char				*free; /* end of ents */
 
+		/* Zero out space from end of ents[] to bests */
 		ents = M_DIROPS(mp)->leaf_ents_p(leaf);
 		free = (char *)&ents[leafhdr.count];
 		ltp = xfs_dir2_leaf_tail_p(mp->m_dir_geo, leaf);
 		lbp = xfs_dir2_leaf_bests_p(ltp);
 		memset(free, 0, (char *)lbp - free);
 		iocur_top->need_crc = 1;
+		break;
+	}
+	case XFS_DIR2_LEAFN_MAGIC:
+	case XFS_DIR3_LEAFN_MAGIC: {
+		struct xfs_dir2_leaf_entry	*ents;
+		char				*free;
+		int				used;
+
+		/* Zero out space from end of ents[] to end of block */
+		ents = M_DIROPS(mp)->leaf_ents_p(leaf);
+		free = (char *)&ents[leafhdr.count];
+		used = free - (char*)leaf;
+		memset(free, 0, mp->m_dir_geo->blksize - used);
+		iocur_top->need_crc = 1;
+		break;
+	}
+	default:
+		break;
 	}
 }