Re: [PATCH 19/21] scsi: sd: Add WRITE_ATOMIC_16 support

Bart Van Assche
2023-09-29T17:59:19Z

On 9/29/23 03:27, John Garry wrote:
> +static blk_status_t sd_setup_atomic_cmnd(struct scsi_cmnd *cmd,
> + sector_t lba, unsigned int nr_blocks,
> + unsigned char flags)
> +{
> + cmd->cmd_len = 16;
> + cmd->cmnd[0] = WRITE_ATOMIC_16;
> + cmd->cmnd[1] = flags;
> + put_unaligned_be64(lba, &cmd->cmnd[2]);
> + cmd->cmnd[10] = 0;
> + cmd->cmnd[11] = 0;
> + put_unaligned_be16(nr_blocks, &cmd->cmnd[12]);
> + cmd->cmnd[14] = 0;
> + cmd->cmnd[15] = 0;
> +
> + return BLK_STS_OK;
> +}

Please store the 'dld' value in the GROUP NUMBER field. See e.g.
sd_setup_rw16_cmnd().

> @@ -1139,6 +1156,7 @@ static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
> unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
> unsigned int mask = logical_to_sectors(sdp, 1) - 1;
> bool write = rq_data_dir(rq) == WRITE;
> + bool atomic_write = !!(rq->cmd_flags & REQ_ATOMIC) && write;

Please leave out the superfluous "!!".

Thanks,

Bart.