md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations

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@huawei.com>
Link: https://lore.kernel.org/r/20240826074452.1490072-34-yukuai1@huaweicloud.comSigned-off-by: Song Liu <song@kernel.org>

drivers/md/md-bitmap.c

@@ -1298,7 +1298,7 @@ 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 mddev *mddev)
 {
 	struct bitmap *bitmap;
 	unsigned long j;
@@ -1815,11 +1815,11 @@ 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(mddev);
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(mddev);
 	bitmap->daemon_lastrun -= sleep;
-	md_bitmap_daemon_work(mddev);
+	bitmap_daemon_work(mddev);
 	if (mddev->bitmap_info.external)
 		md_super_wait(mddev);
 	bitmap_update_sb(bitmap);
@@ -2754,6 +2754,7 @@ static struct bitmap_operations bitmap_ops = {
 	.write_all		= bitmap_write_all,
 	.dirty_bits		= bitmap_dirty_bits,
 	.unplug			= bitmap_unplug,
+	.daemon_work		= bitmap_daemon_work,
 
 	.startwrite		= bitmap_startwrite,
 	.endwrite		= bitmap_endwrite,

drivers/md/md-bitmap.h

@@ -255,6 +255,7 @@ struct bitmap_operations {
 	void (*dirty_bits)(struct mddev *mddev, unsigned long s,
 			   unsigned long e);
 	void (*unplug)(struct mddev *mddev, bool sync);
+	void (*daemon_work)(struct mddev *mddev);
 
 	int (*startwrite)(struct mddev *mddev, sector_t offset,
 			  unsigned long sectors, bool behind);
@@ -278,7 +279,6 @@ struct bitmap_operations {
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-void md_bitmap_daemon_work(struct mddev *mddev);
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 		     int chunksize, int init);

drivers/md/md.c

@@ -9638,7 +9638,7 @@ static void unregister_sync_thread(struct mddev *mddev)
 void md_check_recovery(struct mddev *mddev)
 {
 	if (mddev->bitmap)
-		md_bitmap_daemon_work(mddev);
+		mddev->bitmap_ops->daemon_work(mddev);
 
 	if (signal_pending(current)) {
 		if (mddev->pers->sync_request && !mddev->external) {