From: Joe Thornber <ejt@redhat.com>

dm thin metadata: zero the uuid

The uuid is an unused field in the superblock.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
 drivers/md/dm-thin-metadata.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-3.5-rc7/drivers/md/dm-thin-metadata.c
===================================================================
--- linux-3.5-rc7.orig/drivers/md/dm-thin-metadata.c
+++ linux-3.5-rc7/drivers/md/dm-thin-metadata.c
@@ -455,6 +455,7 @@ static int __write_initial_superblock(st
 
 	disk_super = dm_block_data(sblock);
 	disk_super->flags = 0;
+	memset(disk_super->uuid, 0, sizeof(disk_super->uuid));
 	disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC);
 	disk_super->version = cpu_to_le32(THIN_VERSION);
 	disk_super->time = 0;