linux-kernel - Re: [PATCH 4/4] block: Optionally snapshot page contents to provide stable pages during write

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Message-ID: <87k3roypnq.fsf@devron.myhome.or.jp>
Date:	Tue, 08 Jan 2013 18:44:57 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	axboe@...nel.dk, lucho@...kov.net, jack@...e.cz, ericvh@...il.com,
	viro@...iv.linux.org.uk, rminnich@...dia.gov, tytso@....edu,
	martin.petersen@...cle.com, neilb@...e.de, david@...morbit.com,
	Zheng Liu <gnehzuil.liu@...il.com>,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	linux-fsdevel@...r.kernel.org, adilger.kernel@...ger.ca,
	bharrosh@...asas.com, jlayton@...ba.org,
	v9fs-developer@...ts.sourceforge.net, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/4] block: Optionally snapshot page contents to provide stable pages during write

"Darrick J. Wong" <darrick.wong@...cle.com> writes:

> On Fri, Dec 28, 2012 at 06:48:35AM +0900, OGAWA Hirofumi wrote:
>> "Darrick J. Wong" <darrick.wong@...cle.com> writes:
>> 
>> >> I think this flag should be separated into "FS provide stable page" and
>> >> "FS needs bounce buffer for stable page".
>> >> 
>> >> My fs (I guess btrfs also) provides stable page by better way, and
>> >> doesn't need to wait writeback flags too. What needs is just to avoid
>> >> those stable page stuff.
>> >
>> > How does your fs (are we talking about vfat?) provide stable pages?
>> 
>> Basically it copies the data to another page before modifying data only
>> if page has writeback flag. (this is about new fs under development stage.)
>
> Aha, we're talking about tux3.  Since (afaik) there aren't any other
> filesystems requesting this flag and tux3 uses the device bdi, should I just
> create a patch and send it to you so it'll be included when tux3 goes in?

If core doesn't provide, no need to waste your time. I will.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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