On Thu, 2014-05-01 at 16:51 +0200, Christoph Hellwig wrote:
> Add an option to only transfer half the data for every n-th command.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Reviewed-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> ---
> drivers/scsi/scsi_debug.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
> index f3e9cc0..1328a26 100644
> --- a/drivers/scsi/scsi_debug.c
> +++ b/drivers/scsi/scsi_debug.c
> @@ -130,6 +130,7 @@ static const char * scsi_debug_version_date = "20100324";
> #define SCSI_DEBUG_OPT_DIF_ERR 32
> #define SCSI_DEBUG_OPT_DIX_ERR 64
> #define SCSI_DEBUG_OPT_MAC_TIMEOUT 128
> +#define SCSI_DEBUG_OPT_SHORT_TRANSFER 256
> /* When "every_nth" > 0 then modulo "every_nth" commands:
> * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
> * - a RECOVERED_ERROR is simulated on successful read and write
> @@ -3583,6 +3584,7 @@ int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
> int inj_transport = 0;
> int inj_dif = 0;
> int inj_dix = 0;
> + int inj_short = 0;
> int delay_override = 0;
> int unmap = 0;
>
> @@ -3628,6 +3630,8 @@ int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
> inj_dif = 1; /* to reads and writes below */
> else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)
> inj_dix = 1; /* to reads and writes below */
> + else if (SCSI_DEBUG_OPT_SHORT_TRANSFER & scsi_debug_opts)
> + inj_short = 1;
> }
>
> if (devip->wlun) {
> @@ -3744,6 +3748,10 @@ read:
> if (scsi_debug_fake_rw)
> break;
> get_data_transfer_info(cmd, &lba, &num, &ei_lba);
> +
> + if (inj_short)
> + num /= 2;
> +
> errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
> if (inj_recovered && (0 == errsts)) {
> mk_sense_buffer(devip, RECOVERED_ERROR,
--
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