[PATCHv2 02/10] blk-mq: Export test for started requests

[Keith Busch]

Drivers can iterate over all allocated request tags, but their callback
needs a way to know if the driver started the request in the first place.

Signed-off-by: Keith Busch <keith.busch at intel.com>
---
 block/blk-mq.c         |    6 ++++++
 include/linux/blk-mq.h |    1 +
 2 files changed, 7 insertions(+)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6d83ee6..82930c0 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -398,6 +398,12 @@ void blk_mq_complete_request(struct request *rq)
 }
 EXPORT_SYMBOL(blk_mq_complete_request);
 
+int blk_mq_request_started(struct request *rq)
+{
+	return test_bit(REQ_ATOM_STARTED, &rq->atomic_flags);
+}
+EXPORT_SYMBOL_GPL(blk_mq_request_started);
+
 void blk_mq_start_request(struct request *rq)
 {
 	struct request_queue *q = rq->q;
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 3b43f50..8bbd082 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -195,6 +195,7 @@ static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
 struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
 struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
 
+int blk_mq_request_started(struct request *rq);
 void blk_mq_start_request(struct request *rq);
 void blk_mq_end_request(struct request *rq, int error);
 void __blk_mq_end_request(struct request *rq, int error);
-- 
1.7.10.4