fuse: add noreply to fuse_args

This will be used by fuse_force_forget().

We can expand fuse_request_send() into fuse_simple_request().  The
FR_WAITING bit has already been set, no need to check.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/fuse/dev.c

@@ -591,7 +591,9 @@ ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
 	req->out.numargs = args->out_numargs;
 	memcpy(req->out.args, args->out_args,
 	       args->out_numargs * sizeof(struct fuse_arg));
-	fuse_request_send(fc, req);
+	if (!args->noreply)
+		__set_bit(FR_ISREPLY, &req->flags);
+	__fuse_request_send(fc, req);
 	ret = req->out.h.error;
 	if (!ret && args->out_argvar) {
 		BUG_ON(args->out_numargs != 1);

fs/fuse/fuse_i.h

@@ -292,6 +292,7 @@ struct fuse_args {
 	unsigned short in_numargs;
 	unsigned short out_numargs;
 	bool force:1;
+	bool noreply:1;
 	bool out_argvar:1;
 	struct fuse_in_arg in_args[3];
 	struct fuse_arg out_args[2];