Commit f62c302e authored by Anand Jain's avatar Anand Jain Committed by David Sterba
Browse files

btrfs: add comment about metadata_uuid in btrfs_fs_devices 



Add comment about metadata_uuid in btrfs_fs_devices.
No functional change.

Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent c6930d7d

fs/btrfs/volumes.h

+12 −0
Original line number Diff line number Diff line
@@ -280,7 +280,19 @@ enum btrfs_read_policy { 


struct btrfs_fs_devices {

	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */



	/*

	 * UUID written into the btree blocks:

	 *

	 * - If metadata_uuid != fsid then super block must have

	 *   BTRFS_FEATURE_INCOMPAT_METADATA_UUID flag set.

	 *

	 * - Following shall be true at all times:

	 *   - metadata_uuid == btrfs_header::fsid

	 *   - metadata_uuid == btrfs_dev_item::fsid

	 */

	u8 metadata_uuid[BTRFS_FSID_SIZE];



	struct list_head fs_list;



	/*