linux-kernel - Re: [PATCH 4/6] Ext4: fail if we try to use hole punch

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Message-ID: <20101116125016.GA31957@dhcp231-156.rdu.redhat.com>
Date:	Tue, 16 Nov 2010 07:50:16 -0500
From:	Josef Bacik <josef@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Josef Bacik <josef@...hat.com>, david@...morbit.com,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	xfs@....sgi.com, cmm@...ibm.com, cluster-devel@...hat.com,
	ocfs2-devel@....oracle.com
Subject: Re: [PATCH 4/6] Ext4: fail if we try to use hole punch

On Tue, Nov 16, 2010 at 02:25:35PM +0200, Avi Kivity wrote:
> On 11/15/2010 07:05 PM, Josef Bacik wrote:
>> Ext4 doesn't have the ability to punch holes yet, so make sure we return
>> EOPNOTSUPP if we try to use hole punching through fallocate.  This support can
>> be added later.  Thanks,
>>
>
> Instead of teaching filesystems to fail if they don't support the  
> capability, why don't supporting filesystems say so, allowing the fail  
> code to be in common code?
>

There is no simple way to test if a filesystem supports hole punching or not so
the check has to be done per fs.  Thanks,

Josef
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