[PATCH RFC -next 24/26] md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 drivers/md/md-bitmap.c | 19 +++++++------------
 drivers/md/md-bitmap.h | 10 +++++++++-
 2 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 87e192d172fb..4f3ea6e51572 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1292,9 +1292,9 @@ static void mddev_set_timeout(struct mddev *mddev, unsigned long timeout,
  * bitmap daemon -- periodically wakes up to clean bits and flush pages
  *			out to disk
  */
-void md_bitmap_daemon_work(struct mddev *mddev)
+static void bitmap_daemon_work(struct bitmap *bitmap)
 {
-	struct bitmap *bitmap;
+	struct mddev *mddev = bitmap->mddev;
 	unsigned long j;
 	unsigned long nextpage;
 	sector_t blocks;
@@ -1304,13 +1304,8 @@ void md_bitmap_daemon_work(struct mddev *mddev)
 	 * bitmap_destroy.
 	 */
 	mutex_lock(&mddev->bitmap_info.mutex);
-	bitmap = mddev->bitmap;
-	if (bitmap == NULL) {
-		mutex_unlock(&mddev->bitmap_info.mutex);
-		return;
-	}
-	if (time_before(jiffies, bitmap->daemon_lastrun
-			+ mddev->bitmap_info.daemon_sleep))
+	if (time_before(jiffies, bitmap->daemon_lastrun +
+				 mddev->bitmap_info.daemon_sleep))
 		goto done;
 
 	bitmap->daemon_lastrun = jiffies;
@@ -1780,11 +1775,11 @@ static void bitmap_flush(struct mddev *mddev)
 	 */
 	sleep = mddev->bitmap_info.daemon_sleep * 2;
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(bitmap);
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(bitmap);
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(bitmap);
 	if (mddev->bitmap_info.external)
 		md_super_wait(mddev);
 	bitmap_update_sb(bitmap);
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index 090d4f11f3cd..f67e030139cd 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -254,6 +254,7 @@ struct bitmap_operations {
 	void (*close_sync)(struct bitmap *bitmap);
 	void (*cond_end_sync)(struct bitmap *bitmap, sector_t sector, bool force);
 	void (*wait_behind_writes)(struct bitmap *bitmap);
+	void (*daemon_work)(struct bitmap *bitmap);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*resize)(struct bitmap *bitmap, sector_t blocks, int chunksize,
@@ -404,6 +405,14 @@ static inline void md_bitmap_wait_behind_writes(struct mddev *mddev)
 	mddev->bitmap_ops->wait_behind_writes(mddev->bitmap);
 }
 
+static inline void md_bitmap_daemon_work(struct mddev *mddev)
+{
+	if (!mddev->bitmap || !mddev->bitmap_ops->daemon_work)
+		return;
+
+	mddev->bitmap_ops->daemon_work(mddev->bitmap);
+}
+
 static inline int md_bitmap_resize(struct mddev *mddev, sector_t blocks,
 				   int chunksize, int init)
 {
@@ -453,7 +462,6 @@ static inline void md_bitmap_free(struct mddev *mddev, struct bitmap *bitmap)
 
 void md_bitmap_unplug(struct bitmap *bitmap);
 void md_bitmap_unplug_async(struct bitmap *bitmap);
-void md_bitmap_daemon_work(struct mddev *mddev);
 
 static inline bool md_bitmap_enabled(struct bitmap *bitmap)
 {
-- 
2.39.2