linux-ext4 - Re: hole punching in ext4

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Message-ID: <20130122162009.GB2072@gmail.com>
Date:	Wed, 23 Jan 2013 00:20:09 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	"Bradley C. Kuszmaul" <kuszmaul@...il.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: hole punching in ext4

On Tue, Jan 22, 2013 at 09:34:59AM -0500, Bradley C. Kuszmaul wrote:
> Hi,
> 
> Do any of the ext file systems support hole punching?  If so, do the
> redhat distributions support it?  Can someone provide an example of a
> program that punches a hole in a file in an ext4 file system?

Hello,

Ext4 file system supports hole punching.  But until now only extent-based
file supports it.  As far as I know, redhat distributions don't support
hole punching.  You can find a sample program from e2fsprogs which is in
$e2fsprogs/conrib/fallocate.c.  The latest fallocate(1) in util-linux
also can be as a demo.

Regards,
                                                - Zheng
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