Re: How to remount btrfs without compression?

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On Tue, Nov 08, 2011 at 10:01:51AM -0500, Chris Mason wrote:
> 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@xxxxxxxxx>
> > >>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.

Ok, I had forgotten.  chattr -c clears the compression flag bug doesn't
set the no compress flag.  We looks like we need to patch chattr for
this.

-chris

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