linux-ext4 - Re: hole punching in ext4

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Message-ID: <CAKSyJXew+Sx0AB8HgDZxtOvXyKt8Z_UOe4eG1C=27m2_ubdMVw@mail.gmail.com>
Date:	Tue, 22 Jan 2013 18:50:00 -0500
From:	"Bradley C. Kuszmaul" <kuszmaul@...il.com>
To:	Zheng Liu <gnehzuil.liu@...il.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: hole punching in ext4

Thanks, this has been a very helpful thread.

How do I determine and control whether a file is extent-based?

-Bradley


On Tue, Jan 22, 2013 at 11:20 AM, Zheng Liu <gnehzuil.liu@...il.com> wrote:
> 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.
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