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

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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>
This commit is contained in:
Jens Axboe
2016-09-21 10:12:13 -06:00
parent 63581af3f3
commit 1b792f2f92
2 changed files with 2 additions and 1 deletions
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2
block/blk-mq.c
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@@ -908,7 +908,7 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async)
!blk_mq_hw_queue_mapped(hctx))) !blk_mq_hw_queue_mapped(hctx)))
return; return;
if (!async) { if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) {
int cpu = get_cpu(); int cpu = get_cpu();
if (cpumask_test_cpu(cpu, hctx->cpumask)) { if (cpumask_test_cpu(cpu, hctx->cpumask)) {
__blk_mq_run_hw_queue(hctx); __blk_mq_run_hw_queue(hctx);

1
include/linux/blk-mq.h
View File

@@ -155,6 +155,7 @@ enum {
BLK_MQ_F_TAG_SHARED = 1 << 1, BLK_MQ_F_TAG_SHARED = 1 << 1,
BLK_MQ_F_SG_MERGE = 1 << 2, BLK_MQ_F_SG_MERGE = 1 << 2,
BLK_MQ_F_DEFER_ISSUE = 1 << 4, 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_START_BIT = 8,
BLK_MQ_F_ALLOC_POLICY_BITS = 1, BLK_MQ_F_ALLOC_POLICY_BITS = 1,