linux-ext4 - Re: ext2/3/4: punch support?

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Date:	Mon, 28 Feb 2011 15:50:09 +0100 (CET)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Dave Young <hidave.darkstar@...il.com>
cc:	Josef Bacik <josef@...hat.com>, Theodore Tso <tytso@....edu>,
	linux-ext4@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: ext2/3/4: punch support?

On Mon, 28 Feb 2011, Dave Young wrote:

> On Mon, Feb 28, 2011 at 9:11 PM, Josef Bacik <josef@...hat.com> wrote:
> > On Mon, Feb 28, 2011 at 03:03:40PM +0800, Dave Young wrote:
> >> Hi, josef and ext guys
> >>
> >> Do you have any plan with ext4 hole punching support? And the
> >> fallocate for ext2/3?
> >>
> >> What's the obstacle to work on this? could someone tell the status of
> >> this issue?
> >
> > There is no obstacle, just nobody has bothered to do it.  If you want to do it
> > go for it.  Thanks,
> 
> Yes, I want to do some kvm image space discard stuff,
> I use ext4 as my filesystem, but currently only xfs support something
> like trim/discard.

Ext4 supports discard as well, actually batched discard support was
added into ext4 before xfs :)

Thanks!
-Lukas

> 
> I know general knowledge about ext filesystem, but nearly new to ext4 code,
> could you give some hint where to start?
> 
> --
> Thanks
> dave
> --
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