xfs: publish UUID in struct super_block
Copy the uuid of the filesystem to struct super_block s_uuid field,
as several other filesystems already do. Copy regardless of the nouuid
mount option, because other filesystems also do not guaranty uniqueness
of the s_uuid field in super_block struct.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 688ebff..2eaf818 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -73,6 +73,10 @@ xfs_uuid_mount(
uuid_t *uuid = &mp->m_sb.sb_uuid;
int hole, i;
+ /* Publish UUID in struct super_block */
+ BUILD_BUG_ON(sizeof(mp->m_super->s_uuid) != sizeof(uuid_t));
+ memcpy(&mp->m_super->s_uuid, uuid, sizeof(uuid_t));
+
if (mp->m_flags & XFS_MOUNT_NOUUID)
return 0;