linux-ext4 - Re: possible dev branch regression

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Date:	Sat, 16 Mar 2013 10:32:19 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Eric Whitney <enwlinux@...il.com>
CC:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: possible dev branch regression - xfstest 285/1k

Hi Eric,

Thanks for reporting it.

On 03/16/2013 06:28 AM, Eric Whitney wrote:
> I'm seeing Xfstest 285 consistently fail for the 1k test case using the
> latest dev branch while running on both x86 and ARM.  Subtest 08 is
> the problem. From the test output:
> 
> 08. Test file with unwritten extents, only have unwritten pages
> 08.01 SEEK_HOLE expected 0 or 4194304, got 11264.                 FAIL
> 08.02 SEEK_HOLE expected 1 or 4194304, got 11264.                 FAIL
> 08.03 SEEK_DATA expected 10240 or 10240, got 0.                   FAIL
> 08.04 SEEK_DATA expected 10240 or 10240, got 1.                   FAIL
> 
> From previous discussions, we expect 285 to fail in the ext3 (nodelalloc,
> no flex_bg, and no extents) test case, but in subtest 07.  It still does
> that.

Sorry, my latest patch doesn't finish yet.

> 
> In the dev branch, reverting 4f42f80a8f - "ext4: use s_extent_max_zeroout_kb
> value as number of kb" - results in success for 285 in the 1k test case.

Presumably this patch isn't root cause.  I suspect there are some bugs
in ext4_find_unwritten_pgoff().  I will check it.

Thanks,
						- Zheng
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