cachefiles: remove err_put_fd label in cachefiles_ondemand_daemon_read()

The err_put_fd label is only used once, so remove it to make the code
more readable. In addition, the logic for deleting error request and
CLOSE request is merged to simplify the code.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Link: https://lore.kernel.org/r/20240522114308.2402121-6-libaokun@huaweicloud.comAcked-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jia Zhu <zhujia.zj@bytedance.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/cachefiles/ondemand.c

@@ -305,7 +305,6 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
 {
 	struct cachefiles_req *req;
 	struct cachefiles_msg *msg;
-	unsigned long id = 0;
 	size_t n;
 	int ret = 0;
 	XA_STATE(xas, &cache->reqs, cache->req_id_next);
@@ -340,39 +339,26 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
 	cachefiles_grab_object(req->object, cachefiles_obj_get_read_req);
 	xa_unlock(&cache->reqs);
 
-	id = xas.xa_index;
-
 	if (msg->opcode == CACHEFILES_OP_OPEN) {
 		ret = cachefiles_ondemand_get_fd(req);
 		if (ret) {
 			cachefiles_ondemand_set_object_close(req->object);
-			goto error;
+			goto out;
 		}
 	}
 
-	msg->msg_id = id;
+	msg->msg_id = xas.xa_index;
 	msg->object_id = req->object->ondemand->ondemand_id;
 
 	if (copy_to_user(_buffer, msg, n) != 0) {
 		ret = -EFAULT;
-		goto err_put_fd;
-	}
-
-	cachefiles_put_object(req->object, cachefiles_obj_put_read_req);
-	/* CLOSE request has no reply */
-	if (msg->opcode == CACHEFILES_OP_CLOSE) {
-		xa_erase(&cache->reqs, id);
-		complete(&req->done);
-	}
-
-	cachefiles_req_put(req);
-	return n;
-
-err_put_fd:
 		if (msg->opcode == CACHEFILES_OP_OPEN)
 			close_fd(((struct cachefiles_open *)msg->data)->fd);
-error:
+	}
+out:
 	cachefiles_put_object(req->object, cachefiles_obj_put_read_req);
+	/* Remove error request and CLOSE request has no reply */
+	if (ret || msg->opcode == CACHEFILES_OP_CLOSE) {
 		xas_reset(&xas);
 		xas_lock(&xas);
 		if (xas_load(&xas) == req) {
@@ -381,8 +367,9 @@ ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
 			xas_store(&xas, NULL);
 		}
 		xas_unlock(&xas);
+	}
 	cachefiles_req_put(req);
-	return ret;
+	return ret ? ret : n;
 }
 
 typedef int (*init_req_fn)(struct cachefiles_req *req, void *private);