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>
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