1#val_type uint64_t 2BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0) 3BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1) 4BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2) 5BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3) 6BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4) 7BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5) 8BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6) 9BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7) 10BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8) 11BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9) 12