BTRFS_RAID_SINGLE
&space_info->block_groups[BTRFS_RAID_SINGLE],
btrfs_raid_array[BTRFS_RAID_SINGLE].
if (raid_type == BTRFS_RAID_SINGLE)
return num_stripes == btrfs_raid_array[BTRFS_RAID_SINGLE].dev_stripes;
[BTRFS_RAID_SINGLE] = {
return BTRFS_RAID_SINGLE;