linux-kernel - Re: [PATCH 1/3] direct-io: add a hook for the fs to provide its own bio merging check function

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Message-ID: <4CE48265.5060803@cn.fujitsu.com>
Date:	Thu, 18 Nov 2010 09:33:25 +0800
From:	Miao Xie <miaox@...fujitsu.com>
To:	Chris Mason <chris.mason@...cle.com>
CC:	Josef Bacik <josef@...hat.com>, viro <viro@...iv.linux.org.uk>,
	Linux Fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Btrfs <linux-btrfs@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ito <t-itoh@...fujitsu.com>
Subject: Re: [PATCH 1/3] direct-io: add a hook for the fs to provide its own
 bio merging check function

On 	wed, 17 Nov 2010 20:24:39 -0500, Chris Mason wrote:
> Excerpts from Miao Xie's message of 2010-11-17 20:18:18 -0500:
>>>> Right thats the idea, if we can't span chunks/stripes we should be doing that
>>>> limiting in our get_blocks call and that way we don't have to screw with the
>>>> generic direct io stuff too much.  Thanks,
>>>
>>> In this case we're adding complexity to the O_DIRECT mapping code, when
>>> we really should be adding it to the btrfs submit bio hook.  It can
>>> easily break up the bio into smaller units, which will leave us with a
>>> smaller number of get_blocks calls overall.
>>>
>>> I'm working that out now.
>>
>> Do you mean you are fixing this bug now?
>
> I started on it this afternoon, but lost network due to high winds here.
> So, I didn't make any real progress.
>
> If you'd like to fix this in the btrfs direct-io bio submit call you're
> welcome to continue working on it.
>
> The idea is to just clone and split up the bio, which will keep us from
> filling up fs/direct-io.c w/btrfs rules and allow us to take fewer
> trips into the get_blocks call.

Ok, I'll do it.

Thanks
Miao
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