linux-ext4 - Re: [PATCH v3 0/3] Add XIP support to ext4

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Date:	Wed, 18 Dec 2013 12:13:01 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Dave Chinner <david@...morbit.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>
CC:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 0/3] Add XIP support to ext4

On 12/17/13, 4:30 PM, Dave Chinner wrote:
> On Tue, Dec 17, 2013 at 02:18:25PM -0500, Matthew Wilcox wrote:
>> For v3, we've addressed the problem with unwritten extents that Dave
>> Chinner pointed out. 
> 
> No, you haven't addressed the problem. There is nothing in this
> patch set that converts an unwritten extent after it is written to.
> Hence on every subsequent read will return zeros because the block
> is still marked as unwritten.

I'd really strongly encourage you guys to try running through xfstests.

IF you haven't seen this stuff fail yet, you're apparently not
testing these paths - I'm guessing xfstests may expose these holes
quite well.

I'd be happy to help you get up & running on xfstests if you need a
hand.

-Eric

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