linux-kernel - Re: [PATCH] xfstests 255: add a seek_data/seek

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Date:	Tue, 30 Aug 2011 21:43:41 -0700
From:	Sunil Mushran <sunil.mushran@...cle.com>
To:	Dave Chinner <david@...morbit.com>
CC:	Andreas Dilger <adilger@...ger.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Josef Bacik <josef@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	xfs@....sgi.com, viro@...IV.linux.org.uk, dchinner@...hat.com
Subject: Re: [PATCH] xfstests 255: add a seek_data/seek_hole tester

On 8/30/2011 8:29 PM, Dave Chinner wrote:
> And that's -exactly- the ambiguous, vague definition that has raised
> all these questions in the first place. I was in doubt about whether
> unwritten extents can be considered a hole, and by your definition
> that means it should be data. But Andreas seems to be in no doubt it
> should be considered a hole.

Fair enough. Let me rephrase.

Data:
A range in a file when read could return something other than nulls.

Hole:
A range in a file when read only returns nulls.

Considering preallocated extents only return null, they should
be considered holes.


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