linux-kernel - Re: [RFC][PATCH v3] readahead: introduce O_RANDOM for POSIX_FADV

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Message-Id: <20100104161719.a0bb35ad.sfr@canb.auug.org.au>
Date:	Mon, 4 Jan 2010 16:17:19 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Quentin Barnes <qbarnes+nfs@...oo-inc.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Steven Whitehouse <swhiteho@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Jonathan Corbet <corbet@....net>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC][PATCH v3] readahead: introduce O_RANDOM for
 POSIX_FADV_RANDOM

Hi Wu,

On Mon, 4 Jan 2010 12:50:20 +0800 Wu Fengguang <fengguang.wu@...el.com> wrote:
>
> --- linux.orig/include/asm-generic/fcntl.h	2010-01-04 12:39:29.000000000 +0800
> +++ linux/include/asm-generic/fcntl.h	2010-01-04 12:40:11.000000000 +0800
> @@ -80,6 +80,10 @@
>  #define O_NDELAY	O_NONBLOCK
>  #endif
>  
> +#ifndef O_RANDOM
> +#define O_RANDOM	010000000	/* random access pattern hint */
> +#endif

This value conflicts with O_CLOEXEC on alpha and parisc and O_NOATIME on
sparc.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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