btrfs_header_fsid  537 fs/btrfs/disk-io.c 			btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
btrfs_header_fsid  565 fs/btrfs/disk-io.c 	read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);