cachefiles: remove err_put_fd label in cachefiles_ondemand_daemon_read()

[ Upstream commit 3e6d704f02aa4c50c7bc5fe91a4401df249a137b ]

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.com
Acked-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>
Stable-dep-of: 4b4391e77a6b ("cachefiles: defer exposing anon_fd until after copy_to_user() succeeds")
Signed-off-by: Sasha Levin <sashal@kernel.org>

1 files changed, 16 insertions, 29 deletions

diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index fd73811c7ce4..99b4bffad4a4 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -337,7 +337,6 @@ 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);
@@ -372,49 +371,37 @@ 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);
+		if (msg->opcode == CACHEFILES_OP_OPEN)
+			close_fd(((struct cachefiles_open *)msg->data)->fd);
 	}
-
-	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);
-	xas_reset(&xas);
-	xas_lock(&xas);
-	if (xas_load(&xas) == req) {
-		req->error = ret;
-		complete(&req->done);
-		xas_store(&xas, NULL);
+	/* 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) {
+			req->error = ret;
+			complete(&req->done);
+			xas_store(&xas, NULL);
+		}
+		xas_unlock(&xas);
 	}
-	xas_unlock(&xas);
 	cachefiles_req_put(req);
-	return ret;
+	return ret ? ret : n;
 }
 
 typedef int (*init_req_fn)(struct cachefiles_req *req, void *private);