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Subject: Re: [PATCH 17/18] [GFS2] Remove support for unused and pointlessflag
Date: Fri, 11 Jul 2008 08:47:10 -0400
Message-ID: <Pine.LNX.4.61.0807110845430.18299@chaos.analogic.com>
In-Reply-To: <1215777139.4011.188.camel@quoit>
Thread-Topic: [PATCH 17/18] [GFS2] Remove support for unused and pointlessflag
Thread-Index: AcjjVDwIOb0OgcaHTGm0JgD0HnQXnA==
References: <121577107950-git-send-email-swhiteho@redhat.com> <1215771091790-git-send-email-swhiteho@redhat.com> <12157710931623-git-send-email-swhiteho@redhat.com> <12157710954145-git-send-email-swhiteho@redhat.com> <12157710973601-git-send-email-swhiteho@redhat.com> <12157710983282-git-send-email-swhiteho@redhat.com> <12157711013356-git-send-email-swhiteho@redhat.com> <12157711023743-git-send-email-swhiteho@redhat.com> <12157711041157-git-send-email-swhiteho@redhat.com> <1215771106247-git-send-email-swhiteho@redhat.com> <12157711073280-git-send-email-swhiteho@redhat.com> <12157711093284-git-send-email-swhiteho@redhat.com> <12157711133727-git-send-email-swhiteho@redhat.com> <12157711153366-git-send-email-swhiteho@redhat.com> <12157711171692-git-send-email-swhiteho@redhat.com> <1215771119431-git-send-email-swhiteho@redhat.com> <Pine.LNX.4.61.0807110714110.18083@chaos.analog! ic.com> <1215777139.4011.188.camel@quoit>
From: "linux-os (Dick Johnson)" <linux-os@analogic.com>
To: "Steven Whitehouse" <swhiteho@redhat.com>
Cc: "Linux kernel" <linux-kernel@vger.kernel.org>, <cluster-devel@redhat.com>
Reply-To: "linux-os (Dick Johnson)" <linux-os@analogic.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2337
Lines: 54


On Fri, 11 Jul 2008, Steven Whitehouse wrote:

> Hi,
>
> On Fri, 2008-07-11 at 07:19 -0400, linux-os (Dick Johnson) wrote:
>> On Fri, 11 Jul 2008 swhiteho@redhat.com wrote:
>>
>>> From: Steven Whitehouse <swhiteho@redhat.com>
>>>
>>> The ability to mark files for direct i/o access when opened
>>> normally is both unused and pointless, so this patch removes
>>> support for that feature.
>> [Snipped...]
>>
>> So linux is no longer going to support commercial databases?
[Snipped...]

>>
> No, thats not what it means...., but perhaps I could have explained it
> better. You can still use O_DIRECT flags in open syscalls in exactly the
> same way as before. What this patch removes is the (never used, and IMHO
> pointless) feature of being able to set a flag on the inode (via
> chattr/setattr) to force open's to set O_DIRECT in every case, even when
> the application didn't ask for it. The reason that its pointless is that
> applications which don't otherwise support O_DIRECT are very unlikely to
> supply suitably aligned buffers and I/O requests, so that overriding the
> O_DIRECT flag for such applications will most likely result in an I/O
> error.
>
> GFS2 will still support O_DIRECT just the same as it has always done,
> and this doesn't affect any other filesystem's support for that feature
> either,
>
> Steve.

Thanks for the clarification!

Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.28 BogoMips).
My book : http://www.AbominableFirebug.com/
_


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