md/md-bitmap: merge md_bitmap_update_sb() 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/20240826074452.1490072-19-yukuai1@huaweicloud.comSigned-off-by: Song Liu <song@kernel.org>

drivers/md/md-bitmap.c

@@ -472,7 +472,7 @@ static void md_bitmap_wait_writes(struct bitmap *bitmap)
 
 
 /* update the event counter and sync the superblock to disk */
-void md_bitmap_update_sb(struct bitmap *bitmap)
+static void bitmap_update_sb(struct bitmap *bitmap)
 {
 	bitmap_super_t *sb;
 
@@ -510,7 +510,6 @@ void md_bitmap_update_sb(struct bitmap *bitmap)
 		write_sb_page(bitmap, bitmap->storage.sb_index,
 			      bitmap->storage.sb_page, 1);
 }
-EXPORT_SYMBOL(md_bitmap_update_sb);
 
 static void bitmap_print_sb(struct bitmap *bitmap)
 {
@@ -892,7 +891,7 @@ static void md_bitmap_file_unmap(struct bitmap_storage *store)
 static void md_bitmap_file_kick(struct bitmap *bitmap)
 {
 	if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
-		md_bitmap_update_sb(bitmap);
+		bitmap_update_sb(bitmap);
 
 		if (bitmap->storage.file) {
 			pr_warn("%s: kicking failed bitmap file %pD4 from array!\n",
@@ -1792,7 +1791,7 @@ static void bitmap_flush(struct mddev *mddev)
 	md_bitmap_daemon_work(mddev);
 	if (mddev->bitmap_info.external)
 		md_super_wait(mddev);
-	md_bitmap_update_sb(bitmap);
+	bitmap_update_sb(bitmap);
 }
 
 /*
@@ -2022,7 +2021,7 @@ static int bitmap_load(struct mddev *mddev)
 	mddev_set_timeout(mddev, mddev->bitmap_info.daemon_sleep, true);
 	md_wakeup_thread(mddev->thread);
 
-	md_bitmap_update_sb(bitmap);
+	bitmap_update_sb(bitmap);
 
 	if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
 		err = -EIO;
@@ -2083,7 +2082,7 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 	}
 
 	if (clear_bits) {
-		md_bitmap_update_sb(bitmap);
+		bitmap_update_sb(bitmap);
 		/* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs
 		 * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */
 		for (i = 0; i < bitmap->storage.file_pages; i++)
@@ -2578,7 +2577,7 @@ backlog_store(struct mddev *mddev, const char *buf, size_t len)
 			mddev_create_serial_pool(mddev, rdev);
 	}
 	if (old_mwb != backlog)
-		md_bitmap_update_sb(mddev->bitmap);
+		bitmap_update_sb(mddev->bitmap);
 
 	mddev_unlock_and_resume(mddev);
 	return len;
@@ -2722,6 +2721,8 @@ static struct bitmap_operations bitmap_ops = {
 	.load			= bitmap_load,
 	.destroy		= bitmap_destroy,
 	.flush			= bitmap_flush,
+
+	.update_sb		= bitmap_update_sb,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)

drivers/md/md-bitmap.h

@@ -251,6 +251,8 @@ struct bitmap_operations {
 	int (*load)(struct mddev *mddev);
 	void (*destroy)(struct mddev *mddev);
 	void (*flush)(struct mddev *mddev);
+
+	void (*update_sb)(struct bitmap *bitmap);
 };
 
 /* the bitmap API */
@@ -258,7 +260,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 
-void md_bitmap_update_sb(struct bitmap *bitmap);
 int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats);
 
 int  md_bitmap_setallbits(struct bitmap *bitmap);

drivers/md/md-cluster.c

@@ -1255,7 +1255,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;
 		rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
 		if (!rv)
-			md_bitmap_update_sb(bitmap);
+			mddev->bitmap_ops->update_sb(bitmap);
 		lockres_free(bm_lockres);
 
 		rv = md_bitmap_get_stats(bitmap, &stats);

drivers/md/md.c

@@ -2838,7 +2838,7 @@ void md_update_sb(struct mddev *mddev, int force_change)
 
 	mddev_add_trace_msg(mddev, "md md_update_sb");
 rewrite:
-	md_bitmap_update_sb(mddev->bitmap);
+	mddev->bitmap_ops->update_sb(mddev->bitmap);
 	rdev_for_each(rdev, mddev) {
 		if (rdev->sb_loaded != 1)
 			continue; /* no noise on spare devices */
@@ -10002,7 +10002,7 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
 		if (ret)
 			pr_info("md-cluster: resize failed\n");
 		else
-			md_bitmap_update_sb(mddev->bitmap);
+			mddev->bitmap_ops->update_sb(mddev->bitmap);
 	}
 
 	/* Check for change of roles in the active devices */