diff -Nurp xfsprogs-3.0.5/repair/sb.c xfsprogs-3.0.5-dirty/repair/sb.c
--- xfsprogs-3.0.5/repair/sb.c	2011-01-28 20:23:02.000000000 +0900
+++ xfsprogs-3.0.5-dirty/repair/sb.c	2011-01-28 20:21:06.000000000 +0900
@@ -122,8 +122,9 @@ find_secondary_sb(xfs_sb_t *rsb)
 			done = 1;
 		}
 
-		if (!done && (bsize = read(x.dfd, sb, BSIZE)) == 0)  {
+		if (!done && (bsize = read(x.dfd, sb, BSIZE)) <= 0)  {
 			done = 1;
+			do_warn(_("Couldn't find candidate secondary superblock, exiting...\n"));
 		}
 
 		do_warn(".");