[PATCH] 01/05 Implement generic dispatch queue

Implements generic dispatch queue which can replace all
dispatch queues implemented by each iosched.  This reduces
code duplication, eases enforcing semantics over dispatch
queue, and simplifies specific ioscheds.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 13 insertions, 10 deletions

diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
index 4e2b1b06b41..d2a66fd309c 100644
--- a/drivers/block/ll_rw_blk.c
+++ b/drivers/block/ll_rw_blk.c
@@ -353,6 +353,8 @@ static void blk_pre_flush_end_io(struct request *flush_rq)
 	struct request *rq = flush_rq->end_io_data;
 	request_queue_t *q = rq->q;
 
+	elv_completed_request(q, flush_rq);
+
 	rq->flags |= REQ_BAR_PREFLUSH;
 
 	if (!flush_rq->errors)
@@ -369,6 +371,8 @@ static void blk_post_flush_end_io(struct request *flush_rq)
 	struct request *rq = flush_rq->end_io_data;
 	request_queue_t *q = rq->q;
 
+	elv_completed_request(q, flush_rq);
+
 	rq->flags |= REQ_BAR_POSTFLUSH;
 
 	q->end_flush_fn(q, flush_rq);
@@ -408,8 +412,6 @@ struct request *blk_start_pre_flush(request_queue_t *q, struct request *rq)
 	if (!list_empty(&rq->queuelist))
 		blkdev_dequeue_request(rq);
 
-	elv_deactivate_request(q, rq);
-
 	flush_rq->end_io_data = rq;
 	flush_rq->end_io = blk_pre_flush_end_io;
 
@@ -1040,6 +1042,7 @@ EXPORT_SYMBOL(blk_queue_invalidate_tags);
 static char *rq_flags[] = {
 	"REQ_RW",
 	"REQ_FAILFAST",
+	"REQ_SORTED",
 	"REQ_SOFTBARRIER",
 	"REQ_HARDBARRIER",
 	"REQ_CMD",
@@ -2456,6 +2459,8 @@ static void __blk_put_request(request_queue_t *q, struct request *req)
 	if (unlikely(--req->ref_count))
 		return;
 
+	elv_completed_request(q, req);
+
 	req->rq_status = RQ_INACTIVE;
 	req->rl = NULL;
 
@@ -2466,8 +2471,6 @@ static void __blk_put_request(request_queue_t *q, struct request *req)
 	if (rl) {
 		int rw = rq_data_dir(req);
 
-		elv_completed_request(q, req);
-
 		BUG_ON(!list_empty(&req->queuelist));
 
 		blk_free_request(q, req);
@@ -2477,14 +2480,14 @@ static void __blk_put_request(request_queue_t *q, struct request *req)
 
 void blk_put_request(struct request *req)
 {
+	unsigned long flags;
+	request_queue_t *q = req->q;
+
 	/*
-	 * if req->rl isn't set, this request didnt originate from the
-	 * block layer, so it's safe to just disregard it
+	 * Gee, IDE calls in w/ NULL q.  Fix IDE and remove the
+	 * following if (q) test.
 	 */
-	if (req->rl) {
-		unsigned long flags;
-		request_queue_t *q = req->q;
-
+	if (q) {
 		spin_lock_irqsave(q->queue_lock, flags);
 		__blk_put_request(q, req);
 		spin_unlock_irqrestore(q->queue_lock, flags);