btrfs_space_info_used
u64 sinfo_used = btrfs_space_info_used(sinfo, true);
used = btrfs_space_info_used(space_info, true);
u64 bytes_used = btrfs_space_info_used(sinfo, false);
left = info->total_bytes - btrfs_space_info_used(info, true);
used = btrfs_space_info_used(space_info, true);
u64 used = btrfs_space_info_used(space_info, false);
used = btrfs_space_info_used(space_info, true);
u64 used = btrfs_space_info_used(space_info, true);
(s64)(info->total_bytes - btrfs_space_info_used(info, true)),
used = btrfs_space_info_used(space_info, true);