linux-kernel - Re: introduce dm-snap-mv

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Message-ID: <AANLkTinOLSJuYs7NsgMZ3+EyNLz_wxpgka8G7ScWG+9V@mail.gmail.com>
Date:	Thu, 14 Oct 2010 00:45:35 +0800
From:	McPacino <mcpacino@...il.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Daniel Phillips <phillips@...nq.net>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Nick Piggin <npiggin@...nel.dk>
Subject: Re: introduce dm-snap-mv

On Fri, Oct 8, 2010 at 5:24 PM, Christoph Hellwig <hch@....de> wrote:
> On Fri, Oct 08, 2010 at 05:14:27PM +0800, McPacino wrote:
>> Hi Christoph,
>>
>> I have to take care the cache problem If using the bio directly.
>> BHs can be released by kernel when necessary.
>>
>> Is there any existing code using bio to read/write metadata
>> blocks? How do they handle the timing freeing bios? I really
>> wish to learn something form it.
>
> If you actually need caching just use the pagecache, e.g.
> read_mapping_page to read in your data.  That completely abstracts
> away the underlying block size.

Hi Christoph,

My understanding is that, read_mapping_page_async() works in submit-wait
way. But whatI want is some function works in submit-callback way, just like
sumbit_bh(). Is there something like it in kernel?

thanks.
cong meng.

>
>
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