[PATCH for-next] nvme: use helpers to access io_uring cmd space

[Pavel Begunkov <asml.silence@gmail.com>]

Command implementations shouldn't be directly looking into io_uring_cmd
to carve free space. Use an io_uring helper, which will also do build
time size sanitisation.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 drivers/nvme/host/ioctl.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 1d769c842fbf..6f351da7f049 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -404,7 +404,7 @@ struct nvme_uring_cmd_pdu {
 static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
 		struct io_uring_cmd *ioucmd)
 {
-	return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu;
+	return io_uring_cmd_to_pdu(ioucmd, struct nvme_uring_cmd_pdu);
 }
 
 static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd,
@@ -634,8 +634,6 @@ static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd,
 	struct nvme_ctrl *ctrl = ns->ctrl;
 	int ret;
 
-	BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu));
-
 	ret = nvme_uring_cmd_checks(issue_flags);
 	if (ret)
 		return ret;
-- 
2.46.0