@@ -832,6 +832,7 @@ static int dix_reads;
static int dif_errors;
/* ZBC global data */
+static bool sdeb_preserves_write_order;
static bool sdeb_zbc_in_use; /* true for host-aware and host-managed disks */
static int sdeb_zbc_zone_cap_mb;
static int sdeb_zbc_zone_size_mb;
@@ -5138,9 +5139,13 @@ static struct sdebug_dev_info *find_build_dev_info(struct scsi_device *sdev)
static int scsi_debug_slave_alloc(struct scsi_device *sdp)
{
+ struct request_queue *q = sdp->request_queue;
+
if (sdebug_verbose)
pr_info("slave_alloc <%u %u %u %llu>\n",
sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
+ if (sdeb_preserves_write_order)
+ q->limits.driver_preserves_write_order = true;
return 0;
}
@@ -5755,6 +5760,8 @@ module_param_named(statistics, sdebug_statistics, bool, S_IRUGO | S_IWUSR);
module_param_named(strict, sdebug_strict, bool, S_IRUGO | S_IWUSR);
module_param_named(submit_queues, submit_queues, int, S_IRUGO);
module_param_named(poll_queues, poll_queues, int, S_IRUGO);
+module_param_named(preserves_write_order, sdeb_preserves_write_order, bool,
+ S_IRUGO);
module_param_named(tur_ms_to_ready, sdeb_tur_ms_to_ready, int, S_IRUGO);
module_param_named(unmap_alignment, sdebug_unmap_alignment, int, S_IRUGO);
module_param_named(unmap_granularity, sdebug_unmap_granularity, int, S_IRUGO);
@@ -5812,6 +5819,8 @@ 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_rwlock, "don't protect user data reads+writes (def=0)");
MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
+MODULE_PARM_DESC(preserves_write_order,
+ "Whether or not to inform the block layer that this driver preserves the order of WRITE commands (def=0)");
MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
MODULE_PARM_DESC(opt_blks, "optimal transfer length in blocks (def=1024)");