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From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: axboe@kernel.dk, lucho@ionkov.net, jack@suse.cz,
	ericvh@gmail.com, viro@zeniv.linux.org.uk, rminnich@sandia.gov,
	tytso@mit.edu, martin.petersen@oracle.com, neilb@suse.de,
	david@fromorbit.com, Zheng Liu <gnehzuil.liu@gmail.com>,
	linux-kernel@vger.kernel.org, hch@infradead.org,
	linux-fsdevel@vger.kernel.org, adilger.kernel@dilger.ca,
	bharrosh@panasas.com, jlayton@samba.org,
	v9fs-developer@lists.sourceforge.net, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 4/4] block: Optionally snapshot page contents to provide stable pages during write
Date: Tue, 08 Jan 2013 18:44:57 +0900	[thread overview]
Message-ID: <87k3roypnq.fsf@devron.myhome.or.jp> (raw)
In-Reply-To: <20130107204436.GO20106@blackbox.djwong.org> (Darrick J. Wong's message of "Mon, 7 Jan 2013 12:44:36 -0800")

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

> On Fri, Dec 28, 2012 at 06:48:35AM +0900, OGAWA Hirofumi wrote:
>> "Darrick J. Wong" <darrick.wong@oracle.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@mail.parknet.co.jp>

      reply	other threads:[~2013-01-08  9:45 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-13  8:07 [PATCH v2.3 0/3] mm/fs: Implement faster stable page writes on filesystems Darrick J. Wong
2012-12-13  8:07 ` [PATCH 1/4] bdi: Allow block devices to say that they require stable page writes Darrick J. Wong
2012-12-17  9:04   ` Jan Kara
2012-12-13  8:07 ` [PATCH 2/4] mm: Only enforce stable page writes if the backing device requires it Darrick J. Wong
2012-12-17  9:16   ` Jan Kara
2012-12-13  8:08 ` [PATCH 3/4] 9pfs: Fix filesystem to wait for stable page writeback Darrick J. Wong
2012-12-17 10:11   ` Jan Kara
2012-12-13  8:08 ` [PATCH 4/4] block: Optionally snapshot page contents to provide stable pages during write Darrick J. Wong
2012-12-14  1:48   ` Andy Lutomirski
2012-12-14  2:10     ` Darrick J. Wong
2012-12-14  3:33       ` Dave Chinner
2012-12-14 19:43         ` Darrick J. Wong
2012-12-15  1:12       ` Andy Lutomirski
2012-12-15  2:01         ` Darrick J. Wong
2012-12-15  2:06           ` Andy Lutomirski
2012-12-17 22:54             ` Darrick J. Wong
2012-12-16 16:13   ` Zheng Liu
2012-12-17 22:56     ` Darrick J. Wong
2012-12-17 10:23   ` Jan Kara
2012-12-17 23:20     ` Darrick J. Wong
2012-12-27 19:14   ` OGAWA Hirofumi
2012-12-27 21:40     ` Darrick J. Wong
2012-12-27 21:48       ` OGAWA Hirofumi
2013-01-07 20:44         ` Darrick J. Wong
2013-01-08  9:44           ` OGAWA Hirofumi [this message]

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