linux-kernel - RE: [PATCH 00/16] f2fs: introduce flash-friendly file system

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Date:	Wed, 10 Oct 2012 12:05:33 +0400
From:	Vyacheslav Dubeyko <slava@...eyko.com>
To:	Jooyoung Hwang <jooyoung.hwang@...sung.com>
Cc:	'Marco Stornelli' <marco.stornelli@...il.com>,
	'Jaegeuk Kim' <jaegeuk.kim@...il.com>,
	'Al Viro' <viro@...iv.linux.org.uk>, tytso@....edu,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	chur.lee@...sung.com, cm224.lee@...sung.com,
	linux-fsdevel@...r.kernel.org
Subject: RE: [PATCH 00/16] f2fs: introduce flash-friendly file system

On Tue, 2012-10-09 at 14:53 -0500, Jooyoung Hwang wrote:
> On Tue, 2012-10-09 at 16:08 +0900, Jaegeuk Kim wrote:
> > > -----Original Message-----
> > > From: Vyacheslav Dubeyko [mailto:slava@...eyko.com]
> > > Sent: Tuesday, October 09, 2012 4:23 AM
> > > To: Jaegeuk Kim
> > > Cc: 'Marco Stornelli'; 'Jaegeuk Kim'; 'Al Viro'; tytso@....edu; gregkh@...uxfoundation.org; linux-
> > > kernel@...r.kernel.org; chur.lee@...sung.com; cm224.lee@...sung.com; jooyoung.hwang@...sung.com;
> > > linux-fsdevel@...r.kernel.org
> > > Subject: Re: [PATCH 00/16] f2fs: introduce flash-friendly file system

> 
> I'd like you to refer to the following link as well which is about
> mobile workload pattern.
> http://www.cs.cmu.edu/~fuyaoz/courses/15712/report.pdf
> It's reported that in Android there are frequent issues of fsync and
> most of them are only for small size of data.
> 
> To provide efficient fsync, F2FS minimizes the amount of metadata
> written to serve a fsync. Fsync in F2FS is completed by writing user
> data blocks and direct node blocks which point to them rather than
> creating a new checkpoint which would incur more I/O loads. 
> If sudden power failure happens, then F2FS recovery routine rolls back
> to the latest checkpoint and thereafter recovers file system state to
> reflect all the completed fsync operations, which we call roll-forward
> recovery.
> You may want to look at the code about the roll-forward in recover_fsync_data().
> 

Thank you.

With the best regards,
Vyacheslav Dubeyko.

> --
> Jooyoung Hwang
> Samsung Electronics
> 
> --
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