[PATCH RFC -next 04/26] md/md-bitmap: merge md_bitmap_destroy() 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 |  7 ++++---
 drivers/md/md-bitmap.h | 10 +++++++++-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 9a9f0fe3ebd0..8aaf0491bf5d 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1852,7 +1852,7 @@ void md_bitmap_wait_behind_writes(struct mddev *mddev)
 	}
 }
 
-void md_bitmap_destroy(struct mddev *mddev)
+static void bitmap_destroy(struct mddev *mddev)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 
@@ -2366,7 +2366,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			goto out;
 		}
 
-		md_bitmap_destroy(mddev);
+		bitmap_destroy(mddev);
 		mddev->bitmap_info.offset = 0;
 		if (mddev->bitmap_info.file) {
 			struct file *f = mddev->bitmap_info.file;
@@ -2413,7 +2413,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			rv = bitmap_load(mddev);
 			if (rv) {
 				mddev->bitmap_info.offset = 0;
-				md_bitmap_destroy(mddev);
+				bitmap_destroy(mddev);
 				goto out;
 			}
 		}
@@ -2710,6 +2710,7 @@ const struct attribute_group md_bitmap_group = {
 static struct bitmap_operations bitmap_ops = {
 	.create			= bitmap_create,
 	.load			= bitmap_load,
+	.destroy		= bitmap_destroy,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index de7fbe5903dd..46db4d8199d8 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -237,6 +237,7 @@ struct bitmap {
 struct bitmap_operations {
 	struct bitmap* (*create)(struct mddev *mddev, int slot);
 	int (*load)(struct mddev *mddev);
+	void (*destroy)(struct mddev *mddev);
 };
 
 /* the bitmap API */
@@ -259,8 +260,15 @@ static inline int md_bitmap_load(struct mddev *mddev)
 	return mddev->bitmap_ops->load(mddev);
 }
 
+static inline void md_bitmap_destroy(struct mddev *mddev)
+{
+	if (!mddev->bitmap_ops->destroy)
+		return;
+
+	mddev->bitmap_ops->destroy(mddev);
+}
+
 void md_bitmap_flush(struct mddev *mddev);
-void md_bitmap_destroy(struct mddev *mddev);
 
 void md_bitmap_print_sb(struct bitmap *bitmap);
 void md_bitmap_update_sb(struct bitmap *bitmap);
-- 
2.39.2