fuse: Move fuse_get_dev to header file

Another preparation patch, as this function will be needed by
fuse/dev.c and fuse/dev_uring.c.

Signed-off-by: Bernd Schubert <bschubert@ddn.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Luis Henriques <luis@igalia.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

Author: bsbernd

fs/fuse/dev.c

@@ -35,15 +35,6 @@ MODULE_ALIAS("devname:fuse");
 
 static struct kmem_cache *fuse_req_cachep;
 
-static struct fuse_dev *fuse_get_dev(struct file *file)
-{
-	/*
-	 * Lockless access is OK, because file->private data is set
-	 * once during mount and is valid until the file is released.
-	 */
-	return READ_ONCE(file->private_data);
-}
-
 static void fuse_request_init(struct fuse_mount *fm, struct fuse_req *req)
 {
 	INIT_LIST_HEAD(&req->list);

fs/fuse/fuse_dev_i.h

@@ -8,6 +8,15 @@
 
 #include <linux/types.h>
 
+static inline struct fuse_dev *fuse_get_dev(struct file *file)
+{
+	/*
+	 * Lockless access is OK, because file->private data is set
+	 * once during mount and is valid until the file is released.
+	 */
+	return READ_ONCE(file->private_data);
+}
+
 void fuse_dev_end_requests(struct list_head *head);
 
 #endif