1#val_type uint64_t 2BTRFS_BLOCK_GROUP_DATA (1ULL << 0) 3BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1) 4BTRFS_BLOCK_GROUP_METADATA (1ULL << 2) 5BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3) 6BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4) 7BTRFS_BLOCK_GROUP_DUP (1ULL << 5) 8BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6) 9BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7) 10BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8) 11BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48) 12BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49) 13