From: Dave Young Subject: Re: ext2/3/4: punch support? Date: Mon, 28 Feb 2011 22:29:56 +0800 Message-ID: References: <20110228131118.GA18193@dhcp231-156.rdu.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Theodore Tso , linux-ext4@vger.kernel.org, Linux Kernel Mailing List To: Josef Bacik Return-path: In-Reply-To: <20110228131118.GA18193@dhcp231-156.rdu.redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Mon, Feb 28, 2011 at 9:11 PM, Josef Bacik 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 o= f >> this issue? > > There is no obstacle, just nobody has bothered to do it. =C2=A0If you= want to do it > go for it. =C2=A0Thanks, 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. I know general knowledge about ext filesystem, but nearly new to ext4 c= ode, could you give some hint where to start? -- Thanks dave