static int do_device_access(struct sdeb_store_info *sip, struct scsi_cmnd *scp,
			    u32 sg_skip, u64 lba, u32 num, bool do_write)
static int do_device_access(struct sdeb_store_info *sip, struct scsi_cmnd *scp,
			    u32 sg_skip, u64 lba, u32 num, bool do_write,
			    u8 group_number)