Signed-off-by: Jens Axboe <axboe@xxxxxx> --- drivers/block/null_blk.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 4943ee22716e..f2726936cd1a 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -117,6 +117,14 @@ static bool use_lightnvm; module_param(use_lightnvm, bool, S_IRUGO); MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device"); +static bool use_sched; +module_param(use_sched, bool, S_IRUGO); +MODULE_PARM_DESC(use_sched, "Ask for blk-mq scheduling"); + +static bool wc; +module_param(wc, bool, S_IRUGO); +MODULE_PARM_DESC(use_sched, "Claim volatile write cache"); + static int irqmode = NULL_IRQ_SOFTIRQ; static int null_set_irqmode(const char *str, const struct kernel_param *kp) @@ -724,6 +732,9 @@ static int null_add_dev(void) nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; nullb->tag_set.driver_data = nullb; + if (use_sched) + nullb->tag_set.flags |= BLK_MQ_F_SQ_SCHED; + rv = blk_mq_alloc_tag_set(&nullb->tag_set); if (rv) goto out_cleanup_queues; @@ -760,6 +771,9 @@ static int null_add_dev(void) queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); + if (wc) + blk_queue_write_cache(nullb->q, true, false); + mutex_lock(&lock); nullb->index = nullb_indexes++; mutex_unlock(&lock); -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
