[PATCH 2/5] block: make blk_try_enter_queue() available for blk-mq

[Jens Axboe <axboe@kernel.dk>]

Just a prep patch for shifting the queue enter logic.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/blk-core.c | 26 +-------------------------
 block/blk.h      | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 25 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index c2d267b6f910..e00f5a2287cc 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -386,30 +386,6 @@ void blk_cleanup_queue(struct request_queue *q)
 }
 EXPORT_SYMBOL(blk_cleanup_queue);
 
-static bool blk_try_enter_queue(struct request_queue *q, bool pm)
-{
-	rcu_read_lock();
-	if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
-		goto fail;
-
-	/*
-	 * The code that increments the pm_only counter must ensure that the
-	 * counter is globally visible before the queue is unfrozen.
-	 */
-	if (blk_queue_pm_only(q) &&
-	    (!pm || queue_rpm_status(q) == RPM_SUSPENDED))
-		goto fail_put;
-
-	rcu_read_unlock();
-	return true;
-
-fail_put:
-	blk_queue_exit(q);
-fail:
-	rcu_read_unlock();
-	return false;
-}
-
 /**
  * blk_queue_enter() - try to increase q->q_usage_counter
  * @q: request queue pointer
@@ -442,7 +418,7 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
 	return 0;
 }
 
-static inline int bio_queue_enter(struct bio *bio)
+int bio_queue_enter(struct bio *bio)
 {
 	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
 
diff --git a/block/blk.h b/block/blk.h
index 7afffd548daf..f7371d3b1522 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -55,6 +55,31 @@ void blk_free_flush_queue(struct blk_flush_queue *q);
 void blk_freeze_queue(struct request_queue *q);
 void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
 void blk_queue_start_drain(struct request_queue *q);
+int bio_queue_enter(struct bio *bio);
+
+static inline bool blk_try_enter_queue(struct request_queue *q, bool pm)
+{
+	rcu_read_lock();
+	if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
+		goto fail;
+
+	/*
+	 * The code that increments the pm_only counter must ensure that the
+	 * counter is globally visible before the queue is unfrozen.
+	 */
+	if (blk_queue_pm_only(q) &&
+	    (!pm || queue_rpm_status(q) == RPM_SUSPENDED))
+		goto fail_put;
+
+	rcu_read_unlock();
+	return true;
+
+fail_put:
+	blk_queue_exit(q);
+fail:
+	rcu_read_unlock();
+	return false;
+}
 
 #define BIO_INLINE_VECS 4
 struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs,
-- 
2.33.1