From 53d5914f288b67ddc4d594d6a09568fe114bb909 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@redhat.com>
Date: Thu, 2 Apr 2009 19:55:37 +0100
Subject: [PATCH] dm: remove unnecessary struct dm_wq_req
Remove struct dm_wq_req and move "work" directly into struct mapped_device.
In the revised implementation, the thread will do just one type of work
(processing the queue).
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---
drivers/md/dm.c | 24 +++++++-----------------
1 file changed, 7 insertions(+), 17 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f913b507fc81..dac79d11458d 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -99,11 +99,6 @@ union map_info *dm_get_mapinfo(struct bio *bio)
/*
* Work processed by per-device workqueue.
*/
-struct dm_wq_req {
- struct work_struct work;
- struct mapped_device *md;
-};
-
struct mapped_device {
struct rw_semaphore io_lock;
struct mutex suspend_lock;
@@ -125,6 +120,7 @@ struct mapped_device {
*/
atomic_t pending;
wait_queue_head_t wait;
+ struct work_struct work;
struct bio_list deferred;
struct bio_list pushback;
@@ -1070,6 +1066,8 @@ static int next_free_minor(int *minor)
static struct block_device_operations dm_blk_dops;
+static void dm_wq_work(struct work_struct *work);
+
/*
* Allocate and initialise a blank device with a given minor.
*/
@@ -1136,6 +1134,7 @@ static struct mapped_device *alloc_dev(int minor)
atomic_set(&md->pending, 0);
init_waitqueue_head(&md->wait);
+ INIT_WORK(&md->work, dm_wq_work);
init_waitqueue_head(&md->eventq);
md->disk->major = _major;
@@ -1426,26 +1425,17 @@ static void __merge_pushback_list(struct mapped_device *md)
static void dm_wq_work(struct work_struct *work)
{
- struct dm_wq_req *req = container_of(work, struct dm_wq_req, work);
- struct mapped_device *md = req->md;
+ struct mapped_device *md = container_of(work, struct mapped_device,
+ work);
down_write(&md->io_lock);
__flush_deferred_io(md);
up_write(&md->io_lock);
}
-static void dm_wq_queue(struct mapped_device *md, struct dm_wq_req *req)
-{
- req->md = md;
- INIT_WORK(&req->work, dm_wq_work);
- queue_work(md->wq, &req->work);
-}
-
static void dm_queue_flush(struct mapped_device *md)
{
- struct dm_wq_req req;
-
- dm_wq_queue(md, &req);
+ queue_work(md->wq, &md->work);
flush_workqueue(md->wq);
}