[PATCH] md: fix problems with verion-1 superblock code

- off-by-one error
- missing recalc of checksum
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/md.c

@@ -935,8 +935,8 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 
 	max_dev = 0;
 	ITERATE_RDEV(mddev,rdev2,tmp)
-		if (rdev2->desc_nr > max_dev)
-			max_dev = rdev2->desc_nr;
+		if (rdev2->desc_nr+1 > max_dev)
+			max_dev = rdev2->desc_nr+1;
 	
 	sb->max_dev = cpu_to_le32(max_dev);
 	for (i=0; i<max_dev;i++)
@@ -953,6 +953,7 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 	}
 
 	sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
+	sb->sb_csum = calc_sb_1_csum(sb);
 }