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

So that the implementation won't be exposed, and it'll be possible
o invent a new bitmap by replacing bitmap_operations.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240826074452.1490072-40-yukuai1@huaweicloud.comSigned-off-by: Song Liu <song@kernel.org>

drivers/md/md-bitmap.c

@@ -1828,10 +1828,7 @@ static void bitmap_flush(struct mddev *mddev)
 	bitmap_update_sb(bitmap);
 }
 
-/*
- * free memory that was allocated
- */
-void md_bitmap_free(struct bitmap *bitmap)
+static void md_bitmap_free(struct bitmap *bitmap)
 {
 	unsigned long k, pages;
 	struct bitmap_page *bp;
@@ -1865,7 +1862,6 @@ void md_bitmap_free(struct bitmap *bitmap)
 	kfree(bp);
 	kfree(bitmap);
 }
-EXPORT_SYMBOL(md_bitmap_free);
 
 void md_bitmap_wait_behind_writes(struct mddev *mddev)
 {
@@ -2782,6 +2778,7 @@ static struct bitmap_operations bitmap_ops = {
 	.get_from_slot		= bitmap_get_from_slot,
 	.copy_from_slot		= bitmap_copy_from_slot,
 	.set_pages		= bitmap_set_pages,
+	.free			= md_bitmap_free,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)

drivers/md/md-bitmap.h

@@ -280,14 +280,13 @@ struct bitmap_operations {
 	int (*copy_from_slot)(struct mddev *mddev, int slot, sector_t *lo,
 			      sector_t *hi, bool clear_bits);
 	void (*set_pages)(struct bitmap *bitmap, unsigned long pages);
+	void (*free)(struct bitmap *bitmap);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are exported */
-
-void md_bitmap_free(struct bitmap *bitmap);
 void md_bitmap_wait_behind_writes(struct mddev *mddev);
 
 static inline bool md_bitmap_enabled(struct bitmap *bitmap)

drivers/md/md-cluster.c

@@ -1201,12 +1201,12 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			 * can't resize bitmap
 			 */
 			goto out;
-		md_bitmap_free(bitmap);
+		mddev->bitmap_ops->free(bitmap);
 	}
 
 	return 0;
 out:
-	md_bitmap_free(bitmap);
+	mddev->bitmap_ops->free(bitmap);
 	update_bitmap_size(mddev, oldsize);
 	return -1;
 }
@@ -1250,7 +1250,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 		bm_lockres = lockres_init(mddev, str, NULL, 1);
 		if (!bm_lockres) {
 			pr_err("md-cluster: Cannot initialize %s\n", str);
-			md_bitmap_free(bitmap);
+			mddev->bitmap_ops->free(bitmap);
 			return -1;
 		}
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;
@@ -1261,17 +1261,17 @@ static int cluster_check_sync_size(struct mddev *mddev)
 
 		rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 		if (rv) {
-			md_bitmap_free(bitmap);
+			mddev->bitmap_ops->free(bitmap);
 			return rv;
 		}
 
 		if (sync_size == 0) {
 			sync_size = stats.sync_size;
 		} else if (sync_size != stats.sync_size) {
-			md_bitmap_free(bitmap);
+			mddev->bitmap_ops->free(bitmap);
 			return -1;
 		}
-		md_bitmap_free(bitmap);
+		mddev->bitmap_ops->free(bitmap);
 	}
 
 	return (my_sync_size == sync_size) ? 0 : -1;