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>

1 files 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 @@ out:
 
 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);
 }