io_uring: make io_kiocb_to_cmd() typesafe
We need to make sure (at build time) that struct io_cmd_data is not
casted to a structure that's larger.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Link: https://lore.kernel.org/r/c024cdf25ae19fc0319d4180e2298bade8ed17b8.1660201408.git.metze@samba.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/io_uring/splice.c b/io_uring/splice.c
index b013ba3..53e4232 100644
--- a/io_uring/splice.c
+++ b/io_uring/splice.c
@@ -26,7 +26,7 @@ struct io_splice {
static int __io_splice_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
- struct io_splice *sp = io_kiocb_to_cmd(req);
+ struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;
sp->len = READ_ONCE(sqe->len);
@@ -46,7 +46,7 @@ int io_tee_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
int io_tee(struct io_kiocb *req, unsigned int issue_flags)
{
- struct io_splice *sp = io_kiocb_to_cmd(req);
+ struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
struct file *out = sp->file_out;
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
struct file *in;
@@ -78,7 +78,7 @@ int io_tee(struct io_kiocb *req, unsigned int issue_flags)
int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
- struct io_splice *sp = io_kiocb_to_cmd(req);
+ struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
sp->off_in = READ_ONCE(sqe->splice_off_in);
sp->off_out = READ_ONCE(sqe->off);
@@ -87,7 +87,7 @@ int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
int io_splice(struct io_kiocb *req, unsigned int issue_flags)
{
- struct io_splice *sp = io_kiocb_to_cmd(req);
+ struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
struct file *out = sp->file_out;
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
loff_t *poff_in, *poff_out;
