dm thin metadata: zero unused superblock uuid

Zero the unused uuid when initialising the metadata superblock.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index 934b3fc7bfc9db68ffd6eb134040e5d16162abed..9f7c1e01dda230c69c10814e1efd46f182731488 100644 (file)
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -455,6 +455,7 @@ static int __write_initial_superblock(struct dm_pool_metadata *pmd)
 
        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;