io_uring: warn about unhandled opcode
Now that we have all the opcodes handled in terms of command prep and
SQE reuse, add a printk_once() to warn about any potentially new and
unhandled ones.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index e0fc195..1d4e733 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3079,9 +3079,11 @@ static int io_req_defer_prep(struct io_kiocb *req)
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
struct io_async_ctx *io = req->io;
struct iov_iter iter;
- ssize_t ret;
+ ssize_t ret = 0;
switch (req->opcode) {
+ case IORING_OP_NOP:
+ break;
case IORING_OP_READV:
case IORING_OP_READ_FIXED:
/* ensure prep does right import */
@@ -3141,7 +3143,9 @@ static int io_req_defer_prep(struct io_kiocb *req)
ret = io_accept_prep(req);
break;
default:
- ret = 0;
+ printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
+ req->opcode);
+ ret = -EINVAL;
break;
}
