md/md-bitmap: merge md_bitmap_create() 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/20240826074452.1490072-14-yukuai1@huaweicloud.comSigned-off-by: Song Liu <song@kernel.org>

drivers/md/md-bitmap.c

@@ -1966,7 +1966,7 @@ static struct bitmap *__bitmap_create(struct mddev *mddev, int slot)
 	return ERR_PTR(err);
 }
 
-int md_bitmap_create(struct mddev *mddev, int slot)
+static int bitmap_create(struct mddev *mddev, int slot)
 {
 	struct bitmap *bitmap = __bitmap_create(mddev, slot);
 
@@ -2421,7 +2421,7 @@ location_store(struct mddev *mddev, const char *buf, size_t len)
 			}
 
 			mddev->bitmap_info.offset = offset;
-			rv = md_bitmap_create(mddev, -1);
+			rv = bitmap_create(mddev, -1);
 			if (rv)
 				goto out;
 
@@ -2723,6 +2723,7 @@ const struct attribute_group md_bitmap_group = {
 };
 
 static struct bitmap_operations bitmap_ops = {
+	.create			= bitmap_create,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)

drivers/md/md-bitmap.h

@@ -247,13 +247,13 @@ struct md_bitmap_stats {
 };
 
 struct bitmap_operations {
+	int (*create)(struct mddev *mddev, int slot);
 };
 
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
-int md_bitmap_create(struct mddev *mddev, int slot);
 int md_bitmap_load(struct mddev *mddev);
 void md_bitmap_flush(struct mddev *mddev);
 void md_bitmap_destroy(struct mddev *mddev);

drivers/md/md.c

@@ -6224,7 +6224,7 @@ int md_run(struct mddev *mddev)
 	}
 	if (err == 0 && pers->sync_request &&
 	    (mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
-		err = md_bitmap_create(mddev, -1);
+		err = mddev->bitmap_ops->create(mddev, -1);
 		if (err)
 			pr_warn("%s: failed to create bitmap (%d)\n",
 				mdname(mddev), err);
@@ -7282,7 +7282,7 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
 	err = 0;
 	if (mddev->pers) {
 		if (fd >= 0) {
-			err = md_bitmap_create(mddev, -1);
+			err = mddev->bitmap_ops->create(mddev, -1);
 			if (!err)
 				err = md_bitmap_load(mddev);
 
@@ -7576,7 +7576,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 				mddev->bitmap_info.default_offset;
 			mddev->bitmap_info.space =
 				mddev->bitmap_info.default_space;
-			rv = md_bitmap_create(mddev, -1);
+			rv = mddev->bitmap_ops->create(mddev, -1);
 			if (!rv)
 				rv = md_bitmap_load(mddev);