io_uring: use an enumeration for io_uring_register(2) opcodes

The enumeration allows us to keep track of the last
io_uring_register(2) opcode available.

Behaviour and opcodes names don't change.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index d65fde73251859a495df9b2b617f0f870d023ed9..5f12ae6a415c5ff460588a4ff5530f809f960f38 100644 (file)
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -255,17 +255,22 @@ struct io_uring_params {
 /*
  * io_uring_register(2) opcodes and arguments
  */
-#define IORING_REGISTER_BUFFERS                0
-#define IORING_UNREGISTER_BUFFERS      1
-#define IORING_REGISTER_FILES          2
-#define IORING_UNREGISTER_FILES                3
-#define IORING_REGISTER_EVENTFD                4
-#define IORING_UNREGISTER_EVENTFD      5
-#define IORING_REGISTER_FILES_UPDATE   6
-#define IORING_REGISTER_EVENTFD_ASYNC  7
-#define IORING_REGISTER_PROBE          8
-#define IORING_REGISTER_PERSONALITY    9
-#define IORING_UNREGISTER_PERSONALITY  10
+enum {
+       IORING_REGISTER_BUFFERS                 = 0,
+       IORING_UNREGISTER_BUFFERS               = 1,
+       IORING_REGISTER_FILES                   = 2,
+       IORING_UNREGISTER_FILES                 = 3,
+       IORING_REGISTER_EVENTFD                 = 4,
+       IORING_UNREGISTER_EVENTFD               = 5,
+       IORING_REGISTER_FILES_UPDATE            = 6,
+       IORING_REGISTER_EVENTFD_ASYNC           = 7,
+       IORING_REGISTER_PROBE                   = 8,
+       IORING_REGISTER_PERSONALITY             = 9,
+       IORING_UNREGISTER_PERSONALITY           = 10,
+
+       /* this goes last */
+       IORING_REGISTER_LAST
+};
 
 struct io_uring_files_update {
        __u32 offset;