linux-kernel - Re: [PATCH 2/4] vfs: Define new syscalls preadv2,pwritev2

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Message-ID: <x49oat1o4gf.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 24 Oct 2014 11:46:56 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Milosz Tanski <milosz@...in.com>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, "Theodore Ts'o" <tytso@....edu>,
	Al Viro <viro@...iv.linux.org.uk>, linux-api@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH 2/4] vfs: Define new syscalls preadv2,pwritev2

Milosz Tanski <milosz@...in.com> 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
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