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Date: Wed, 22 Apr 2009 01:37:49 +0900
From: Tejun Heo <tj@...nel.org>
To: axboe@...nel.dk, linux-kernel@...r.kernel.org, bzolnier@...il.com
Cc: Tejun Heo <tj@...nel.org>
Subject: [PATCH 02/14] block: kill blk_start_queueing()
blk_start_queueing() is identical to __blk_run_queue() except that it
doesn't check for recursion. None of the current users depends on
blk_start_queueing() running request_fn directly. Replace usages of
blk_start_queueing() with [__]blk_run_queue() and kill it.
[ Impact: removal of mostly duplicate interface function ]
Signed-off-by: Tejun Heo <tj@...nel.org>
---
block/as-iosched.c | 6 +-----
block/blk-core.c | 28 ++--------------------------
block/cfq-iosched.c | 6 +++---
block/elevator.c | 7 +++----
include/linux/blkdev.h | 1 -
5 files changed, 9 insertions(+), 39 deletions(-)
diff --git a/block/as-iosched.c b/block/as-iosched.c
index c48fa67..45bd070 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -1312,12 +1312,8 @@ static void as_merged_requests(struct request_queue *q, struct request *req,
static void as_work_handler(struct work_struct *work)
{
struct as_data *ad = container_of(work, struct as_data, antic_work);
- struct request_queue *q = ad->q;
- unsigned long flags;
- spin_lock_irqsave(q->queue_lock, flags);
- blk_start_queueing(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
+ blk_run_queue(ad->q);
}
static int as_may_queue(struct request_queue *q, int rw)
diff --git a/block/blk-core.c b/block/blk-core.c
index 3de653d..d4c7260 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -433,9 +433,7 @@ EXPORT_SYMBOL(__blk_run_queue);
*
* Description:
* Invoke request handling on this queue, if it has pending work to do.
- * May be used to restart queueing when a request has completed. Also
- * See @blk_start_queueing.
- *
+ * May be used to restart queueing when a request has completed.
*/
void blk_run_queue(struct request_queue *q)
{
@@ -893,28 +891,6 @@ struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask)
EXPORT_SYMBOL(blk_get_request);
/**
- * blk_start_queueing - initiate dispatch of requests to device
- * @q: request queue to kick into gear
- *
- * This is basically a helper to remove the need to know whether a queue
- * is plugged or not if someone just wants to initiate dispatch of requests
- * for this queue. Should be used to start queueing on a device outside
- * of ->request_fn() context. Also see @blk_run_queue.
- *
- * The queue lock must be held with interrupts disabled.
- */
-void blk_start_queueing(struct request_queue *q)
-{
- if (!blk_queue_plugged(q)) {
- if (unlikely(blk_queue_stopped(q)))
- return;
- q->request_fn(q);
- } else
- __generic_unplug_device(q);
-}
-EXPORT_SYMBOL(blk_start_queueing);
-
-/**
* blk_requeue_request - put a request back on queue
* @q: request queue where request should be inserted
* @rq: request to be inserted
@@ -982,7 +958,7 @@ void blk_insert_request(struct request_queue *q, struct request *rq,
drive_stat_acct(rq, 1);
__elv_add_request(q, rq, where, 0);
- blk_start_queueing(q);
+ __blk_run_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
EXPORT_SYMBOL(blk_insert_request);
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 0d3b70d..581f84c 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2078,7 +2078,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE ||
cfqd->busy_queues > 1) {
del_timer(&cfqd->idle_slice_timer);
- blk_start_queueing(cfqd->queue);
+ __blk_run_queue(cfqd->queue);
}
cfq_mark_cfqq_must_dispatch(cfqq);
}
@@ -2090,7 +2090,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
* this new queue is RT and the current one is BE
*/
cfq_preempt_queue(cfqd, cfqq);
- blk_start_queueing(cfqd->queue);
+ __blk_run_queue(cfqd->queue);
}
}
@@ -2335,7 +2335,7 @@ static void cfq_kick_queue(struct work_struct *work)
struct request_queue *q = cfqd->queue;
spin_lock_irq(q->queue_lock);
- blk_start_queueing(q);
+ __blk_run_queue(cfqd->queue);
spin_unlock_irq(q->queue_lock);
}
diff --git a/block/elevator.c b/block/elevator.c
index 7073a90..2e0fb21 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -599,7 +599,7 @@ void elv_quiesce_start(struct request_queue *q)
*/
elv_drain_elevator(q);
while (q->rq.elvpriv) {
- blk_start_queueing(q);
+ __blk_run_queue(q);
spin_unlock_irq(q->queue_lock);
msleep(10);
spin_lock_irq(q->queue_lock);
@@ -643,8 +643,7 @@ void elv_insert(struct request_queue *q, struct request *rq, int where)
* with anything. There's no point in delaying queue
* processing.
*/
- blk_remove_plug(q);
- blk_start_queueing(q);
+ __blk_run_queue(q);
break;
case ELEVATOR_INSERT_SORT:
@@ -971,7 +970,7 @@ void elv_completed_request(struct request_queue *q, struct request *rq)
blk_ordered_cur_seq(q) == QUEUE_ORDSEQ_DRAIN &&
(!next || blk_ordered_req_seq(next) > QUEUE_ORDSEQ_DRAIN)) {
blk_ordered_complete_seq(q, QUEUE_ORDSEQ_DRAIN, 0);
- blk_start_queueing(q);
+ __blk_run_queue(q);
}
}
}
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ba54c83..6e03aef 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -794,7 +794,6 @@ extern void blk_sync_queue(struct request_queue *q);
extern void __blk_stop_queue(struct request_queue *q);
extern void __blk_run_queue(struct request_queue *);
extern void blk_run_queue(struct request_queue *);
-extern void blk_start_queueing(struct request_queue *);
extern int blk_rq_map_user(struct request_queue *, struct request *,
struct rq_map_data *, void __user *, unsigned long,
gfp_t);
--
1.6.0.2
--
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