On Thu, 2017-03-23 at 10:33 -0400, Christoph Hellwig wrote:
> Try to use a write same with unmap bit variant if the device supports it
> and the caller asks for it.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> drivers/scsi/sd.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index b6f70a09a301..ca96bb33471b 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -871,6 +871,16 @@ static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
> return BLKPREP_INVALID;
> return sd_setup_ata_trim_cmnd(cmd);
> }
> +
> + if (rq->cmd_flags & REQ_UNMAP) {
> + switch (sdkp->provisioning_mode) {
> + case SD_LBP_WS16:
> + return sd_setup_write_same16_cmnd(cmd, true);
> + case SD_LBP_WS10:
> + return sd_setup_write_same10_cmnd(cmd, true);
> + }
> + }
> +
> if (sdp->no_write_same)
> return BLKPREP_INVALID;
> if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
Users can change the provisioning mode from user space from SD_LBP_WS16 into
SD_LBP_WS10 so I'm not sure it's safe to skip the (sdkp->ws16 || sector >
0xffffffff || nr_sectors > 0xffff) check if REQ_UNMAP is set.
Bart.--
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