linux-kernel - Re: [PATCH 17/18] [GFS2] Remove support for unused and pointlessflag

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Message-ID: <Pine.LNX.4.61.0807110845430.18299@chaos.analogic.com>
Date:	Fri, 11 Jul 2008 08:47:10 -0400
From:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
To:	"Steven Whitehouse" <swhiteho@...hat.com>
Cc:	"Linux kernel" <linux-kernel@...r.kernel.org>,
	<cluster-devel@...hat.com>
Subject: Re: [PATCH 17/18] [GFS2] Remove support for unused and pointlessflag


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@...hat.com wrote:
>>
>>> From: Steven Whitehouse <swhiteho@...hat.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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