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>
---
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,
--
1.7.10.4
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