linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090401215040.GA7350@mit.edu>
Date:	Wed, 1 Apr 2009 17:50:40 -0400
From:	Theodore Tso <tytso@....edu>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	"Andreas T.Auer" <andreas.t.auer_lkml_73537@...us.ath.cx>,
	Dave Chinner <david@...morbit.com>, Mark Lord <lkml@....ca>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Wed, Apr 01, 2009 at 12:02:26PM -0400, Chris Mason wrote:
> 
> If we crash during the rsync, the backup logs will yell.  If we crash
> just after the rsync, the backup logs won't know.  The data could still
> be gone.

So have rsync call the sync() system call before it exits.  Not a big
deal, and not all that costly.  So basically what I would suggest
doing for people who are really worried about rsync performance with
flush-on-rename is to create a patch to rsync which creates a new
flag, --unlink-before-rename, which will defeat the flush-on-rename
hueristic; and if this patch also causes rsync to call sync() when it
is done, it should be quite safe.

						- Ted
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