#val_type uint64_t
BTRFS_BALANCE_ARGS_PROFILES	(1ULL << 0)
BTRFS_BALANCE_ARGS_USAGE	(1ULL << 1)
BTRFS_BALANCE_ARGS_DEVID	(1ULL << 2)
BTRFS_BALANCE_ARGS_DRANGE	(1ULL << 3)
BTRFS_BALANCE_ARGS_VRANGE	(1ULL << 4)
BTRFS_BALANCE_ARGS_LIMIT        (1ULL << 5)
BTRFS_BALANCE_ARGS_LIMIT_RANGE  (1ULL << 6)
BTRFS_BALANCE_ARGS_STRIPES_RANGE (1ULL << 7)
BTRFS_BALANCE_ARGS_CONVERT	(1ULL << 8)
BTRFS_BALANCE_ARGS_SOFT		(1ULL << 9)
BTRFS_BALANCE_ARGS_USAGE_RANGE	(1ULL << 10)