linux-ext4 - Re: punch-hole should go beyond i

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Message-ID: <4F0FA273.5060108@linux.vnet.ibm.com>
Date:	Thu, 12 Jan 2012 20:18:11 -0700
From:	Allison Henderson <achender@...ux.vnet.ibm.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Dave Chinner <david@...morbit.com>, linux-ext4@...r.kernel.org
Subject: Re: punch-hole should go beyond i_size

On 01/12/2012 05:21 PM, Hugh Dickins wrote:
> On Thu, 12 Jan 2012, Allison Henderson wrote:
>> On 01/11/2012 07:55 PM, Dave Chinner wrote:
>>> On Wed, Jan 11, 2012 at 05:02:12PM -0800, Hugh Dickins wrote:
>>>>
>>>> ext4_ext_punch_hole() contains /* No need to punch hole beyond i_size */
>>>> early return, and trimming to i_size below, but forgets that the other
>>>> variety of fallocate(), with FALLOC_FL_KEEP_SIZE set, may have allocated
>>>> blocks beyond i_size.  They can be removed with ftruncate(), but it is
>>>> unexpected for fallocate() not to undo its own work, and xfs does so.
>>>
>>> I'm pretty sure that's a bug as XFS allows punching holes in extents
>>> beyond EOF.
>>
>> Oh I see, I'll take a look at it, I think it will be ok to just take out the
>> early return.  Thx!
>
> Thanks.  And I've just noticed another, very easily fixed, error:
> I believe those -ENOTSUPPs in ext4_punch_hole() should be -EOPNOTSUPPs.
>
> Hugh
>
Ah, I think youre right, I will change the error values.  I have the 
current solution running in a test right now, and will post the patch 
when it comes up clean.  Thx!

Allison Henderson

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