linux-ext4 - Re: [RFC] add FIEMAP ioctl to efficiently map file allocation

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Message-Id: <69B76939-CAAD-4F43-BE9F-6C3CA3ECCF5E@cam.ac.uk>
Date:	Wed, 2 May 2007 09:30:17 +0100
From:	Anton Altaparmakov <aia21@....ac.uk>
To:	Andreas Dilger <adilger@...sterfs.com>
Cc:	David Chinner <dgc@....com>, linux-ext4@...r.kernel.org,
	Linux Filesystems <linux-fsdevel@...r.kernel.org>,
	xfs@....sgi.com, Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC] add FIEMAP ioctl to efficiently map file allocation

On 2 May 2007, at 09:23, Anton Altaparmakov wrote:
> On 1 May 2007, at 23:30, Andreas Dilger wrote:
>
>> On May 01, 2007  14:22 +1000, David Chinner wrote:
>>> On Mon, Apr 30, 2007 at 04:44:01PM -0600, Andreas Dilger wrote:
>>>> Hmm, I'd thought "offline" would migrate to EXTENT_UNKNOWN, but  
>>>> I didn't
>>>
>>> I disagree - why would you want to indicate the state is unknown  
>>> when we know
>>> very well that it is offline?
>>
>> If you don't like "UNKNOWN", what about "UNMAPPED"?  I just want a
>> catch-all flag that indicates "this extent contains data but there is
>> nothing sensible to be returned for the extent mapping."
>
> I like UNMAPPED.  I even use it in NTFS internally for extents maps  
> that have not been read into memory yet.  (-:

Oops, I use NOT_MAPPED in NTFS rather than UNMAPPED but I still like  
UNMAPPED, too.  (-:

Best regards,

	Anton
-- 
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer, http://www.linux-ntfs.org/


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