From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <chris.mason@oracle.com>
Subject: Re: How to remount btrfs without compression?
Date: Tue, 8 Nov 2011 10:01:51 -0500
Message-ID: <20111108150151.GA4954@shiny>
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Cc: linux-btrfs@vger.kernel.org
To: dima <dolenin@parallels.com>
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On Tue, Nov 08, 2011 at 11:00:42AM +0900, dima wrote:
> On 11/08/2011 10:54 AM, Eric Griffith wrote:
> >On 11/7/2011 8:52 PM, Fajar A. Nugraha wrote:
> >>On Tue, Nov 8, 2011 at 8:06 AM, Eric Griffith<egriffith92@gmail.com>
> >>wrote:
> >>>Edit your
> >>>fstab, remove the compress flag, reboot. Tell btrfs to rebalance the
> >>>system,
> >>>reboot again. And I -THINK- that'll decompress all the files
> >>
> >>I think the original question was how to force uncompressed mode,
> >>whether specific to a file or to a whole filesystem, without having to
> >>reboot :)
> >>
> >>AFAIK there's no way to do that.
> >>
> >
> >Whoops! Misunderstood the question haha. Yeah, as far as decompressing
> >just a single file; from what I've read, thats impossible.
> 
> 
> Eric, Fajar,
> Thanks. Understood.
> 
> Yes, it is possible to remove the compress flag from fstab, reboot
> and even do not do any defragmentation/rebalancing - just re-save
> the file and it will be saved uncompressed. This works. But only
> with reboot...

chattr -c on the file should work (followed by defrag or rewriting the
file).  I just retested and it seems to be broken right now.

I'll track it down.

-chris