On 2018-02-03 01:38 PM, Laurence Oberman wrote:
--- This patch adds two new parameters to the scsi_debug driver. During various fault injection scenarios it would be useful to be able to pick a specific starting sector and number of follow on sectors where a MEDIUM ERROR for reads would be returned against a scsi-debug device. Right now this only works against sector 0x1234 and OPT_MEDIUM_ERR_NUM follow on sectors. However during testing of md-raid and other scenarios I wanted more flexibility. The idea is add 2 new parameters: medium_error_start medium_error_count If medium_error_start is set then we don't use the default of OPT_MEDIUM_ERR_ADDR, but use that set value. If medium_error_count is set we use that value otherwise default to OPT_MEDIUM_ERR_NUM. Signed-off-by: Laurence Oberman <loberman@xxxxxxxxxx> Tested-by : Laurence Oberman <loberman@xxxxxxxxxx>
Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
drivers/scsi/scsi_debug.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index a5986da..5a5aba0 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -616,6 +616,8 @@ enum sdeb_opcode_index { static int sdebug_lowest_aligned = DEF_LOWEST_ALIGNED; static int sdebug_max_luns = DEF_MAX_LUNS; static int sdebug_max_queue = SDEBUG_CANQUEUE; /* per submit queue */ +static unsigned int sdebug_medium_error_start = OPT_MEDIUM_ERR_ADDR; +static int sdebug_medium_error_count = OPT_MEDIUM_ERR_NUM; static atomic_t retired_max_queue; /* if > 0 then was prior max_queue */ static int sdebug_ndelay = DEF_NDELAY; /* if > 0 then unit is nanoseconds */ static int sdebug_no_lun_0 = DEF_NO_LUN_0; @@ -2712,8 +2714,8 @@ static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) }if (unlikely((SDEBUG_OPT_MEDIUM_ERR & sdebug_opts) &&- (lba <= (OPT_MEDIUM_ERR_ADDR + OPT_MEDIUM_ERR_NUM - 1)) && - ((lba + num) > OPT_MEDIUM_ERR_ADDR))) { + (lba <= (sdebug_medium_error_start + sdebug_medium_error_count - 1)) && + ((lba + num) > sdebug_medium_error_start))) { /* claim unrecoverable read error */ mk_sense_buffer(scp, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0); /* set info field and valid bit for fixed descriptor */ @@ -4440,6 +4442,8 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, module_param_named(lowest_aligned, sdebug_lowest_aligned, int, S_IRUGO); module_param_named(max_luns, sdebug_max_luns, int, S_IRUGO | S_IWUSR); module_param_named(max_queue, sdebug_max_queue, int, S_IRUGO | S_IWUSR); +module_param_named(medium_error_start, sdebug_medium_error_start, int, S_IRUGO | S_IWUSR); +module_param_named(medium_error_count, sdebug_medium_error_count, int, S_IRUGO | S_IWUSR); module_param_named(ndelay, sdebug_ndelay, int, S_IRUGO | S_IWUSR); module_param_named(no_lun_0, sdebug_no_lun_0, int, S_IRUGO | S_IWUSR); module_param_named(no_uld, sdebug_no_uld, int, S_IRUGO); @@ -4497,6 +4501,8 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)"); MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)"); MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to max(def))"); +MODULE_PARM_DESC(medium_error_start, "starting sector number to return MEDIUM error"); +MODULE_PARM_DESC(medium_error_count, "count of sectors to return follow on MEDIUM error"); MODULE_PARM_DESC(ndelay, "response delay in nanoseconds (def=0 -> ignore)"); MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)"); MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
