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-rw-r--r--block/blk-core.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 3508751c779a..034cbb2024f0 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1203,18 +1203,32 @@ static bool bio_attempt_front_merge(struct request_queue *q,
return true;
}
-/*
- * Attempts to merge with the plugged list in the current process. Returns
- * true if merge was successful, otherwise false.
+/**
+ * attempt_plug_merge - try to merge with %current's plugged list
+ * @q: request_queue new bio is being queued at
+ * @bio: new bio being queued
+ * @request_count: out parameter for number of traversed plugged requests
+ *
+ * Determine whether @bio being queued on @q can be merged with a request
+ * on %current's plugged list. Returns %true if merge was successful,
+ * otherwise %false.
+ *
+ * This function is called without @q->queue_lock; however, elevator is
+ * accessed iff there already are requests on the plugged list which in
+ * turn guarantees validity of the elevator.
+ *
+ * Note that, on successful merge, elevator operation
+ * elevator_bio_merged_fn() will be called without queue lock. Elevator
+ * must be ready for this.
*/
-static bool attempt_plug_merge(struct task_struct *tsk, struct request_queue *q,
- struct bio *bio, unsigned int *request_count)
+static bool attempt_plug_merge(struct request_queue *q, struct bio *bio,
+ unsigned int *request_count)
{
struct blk_plug *plug;
struct request *rq;
bool ret = false;
- plug = tsk->plug;
+ plug = current->plug;
if (!plug)
goto out;
*request_count = 0;
@@ -1282,7 +1296,7 @@ void blk_queue_bio(struct request_queue *q, struct bio *bio)
* Check if we can merge with the plugged list before grabbing
* any locks.
*/
- if (attempt_plug_merge(current, q, bio, &request_count))
+ if (attempt_plug_merge(q, bio, &request_count))
return;
spin_lock_irq(q->queue_lock);