# Re: \[PATCH 2/4\] vfs: Define new syscalls preadv2,pwritev2

- From: Jeff Moyer \<hidden\>
- Date: 2014-10-24 15:46:56 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2014/10/89282
- Thread: https://ratatoskr.run/linux-fsdevel/2014/10/89282/t.md

```text
Milosz Tanski [ref] writes:

> diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> index 22749c1..10f8883 100644
> --- a/include/uapi/asm-generic/unistd.h
> +++ b/include/uapi/asm-generic/unistd.h
> @@ -213,6 +213,10 @@ __SC_COMP(__NR_pwrite64, sys_pwrite64, compat_sys_pwrite64)
>  __SC_COMP(__NR_preadv, sys_preadv, compat_sys_preadv)
>  #define __NR_pwritev 70
>  __SC_COMP(__NR_pwritev, sys_pwritev, compat_sys_pwritev)
> +#define __NR_preadv2 281
> +__SC_COMP(__NR_preadv2, sys_preadv2)
> +#define __NR_pwritev2 282
> +__SC_COMP(__NR_pwritev2, sys_pwritev2)

This looks odd.  First, __SC_COMP takes 3 arguments.  Second, you are
going to need to implement compat wrappers for the new system calls.

Cheers,
Jeff
```