linux-ext4 - Re: hole punching in ext4

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Message-ID: <50FEB086.4080101@redhat.com>
Date:	Tue, 22 Jan 2013 09:30:14 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Bradley C. Kuszmaul" <kuszmaul@...il.com>
CC:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: hole punching in ext4

On 1/22/13 8:34 AM, Bradley C. Kuszmaul wrote:
> Hi,
> 
> Do any of the ext file systems support hole punching?  

ext4 does:

[esandeen@...t linux-2.6]$ grep -l FALLOC_FL_PUNCH_HOLE fs/ext?/*.[ch]
fs/ext4/extents.c

> If so, do the redhat distributions support it?

Normally a question for Red Hat support, but yes, recent RHEL6
supports punch in ext4.

> Can someone provide an example of a
> program that punches a hole in a file in an ext4 file system?

Upstream fallocate command does with the -p option, for example.

-Eric

> -Bradley
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