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Commit 1b792f2f authored Sep 21, 2016 by Jens Axboe

blk-mq: add flag for drivers wanting blocking ->queue_rq()



If a driver sets BLK_MQ_F_BLOCKING, it is allowed to block in its
->queue_rq() handler. For that case, blk-mq ensures that we always
calls it from a safe context.

Signed-off-by: Jens Axboe <axboe@fb.com>
Tested-by: Josef Bacik <jbacik@fb.com>

parent 63581af3

block/blk-mq.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -908,7 +908,7 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async)
		!blk_mq_hw_queue_mapped(hctx)))
		return;

		if (!async) {
		if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) {
		int cpu = get_cpu();
		if (cpumask_test_cpu(cpu, hctx->cpumask)) {
		__blk_mq_run_hw_queue(hctx);

include/linux/blk-mq.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -155,6 +155,7 @@ enum {
		BLK_MQ_F_TAG_SHARED = 1 << 1,
		BLK_MQ_F_SG_MERGE = 1 << 2,
		BLK_MQ_F_DEFER_ISSUE = 1 << 4,
		BLK_MQ_F_BLOCKING = 1 << 5,
		BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
		BLK_MQ_F_ALLOC_POLICY_BITS = 1,