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scsi_debug: simple short transfer injection 

Add an option to only transfer half the data for every n-th command.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2014-05-01 16:51:51 +02:00
parent b54197c43d
commit b57d7c015d
1 changed files with 8 additions and 0 deletions
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8
drivers/scsi/scsi_debug.c
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@ -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 @@ int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
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,