bdev: make bdev_{release, open_by_dev}() private to block layer

Move both of them to the private block header. There's no caller in the
tree anymore that uses them directly.

Link: https://lore.kernel.org/r/20240123-vfs-bdev-file-v2-28-adbd023e19cc@kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

block/bdev.c

@@ -916,7 +916,6 @@ struct bdev_handle *bdev_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
 	kfree(handle);
 	return ERR_PTR(ret);
 }
-EXPORT_SYMBOL(bdev_open_by_dev);
 
 /*
  * If BLK_OPEN_WRITE_IOCTL is set then this is a historical quirk
@@ -1042,7 +1041,6 @@ void bdev_release(struct bdev_handle *handle)
 	blkdev_put_no_open(bdev);
 	kfree(handle);
 }
-EXPORT_SYMBOL(bdev_release);
 
 /**
  * lookup_bdev() - Look up a struct block_device by name.

block/blk.h

@@ -516,4 +516,8 @@ static inline int req_ref_read(struct request *req)
 	return atomic_read(&req->ref);
 }
 
+void bdev_release(struct bdev_handle *handle);
+struct bdev_handle *bdev_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
+		const struct blk_holder_ops *hops);
+
 #endif /* BLK_INTERNAL_H */

include/linux/blkdev.h

@@ -1482,16 +1482,13 @@ struct bdev_handle {
 	blk_mode_t mode;
 };
 
-struct bdev_handle *bdev_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
-		const struct blk_holder_ops *hops);
 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
 		const struct blk_holder_ops *hops);
 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode,
 		void *holder, const struct blk_holder_ops *hops);
 int bd_prepare_to_claim(struct block_device *bdev, void *holder,
 		const struct blk_holder_ops *hops);
 void bd_abort_claiming(struct block_device *bdev, void *holder);
-void bdev_release(struct bdev_handle *handle);
 
 /* just for blk-cgroup, don't use elsewhere */
 struct block_device *blkdev_get_no_open(dev_t dev);