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Re: [PATCH 1/3] 285: Fix test for ext4 in some configurations

To: Jan Kara <jack@xxxxxxx>
Subject: Re: [PATCH 1/3] 285: Fix test for ext4 in some configurations
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 31 May 2013 08:30:00 +1000
Cc: xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1369917939-22660-1-git-send-email-jack@xxxxxxx>
References: <1369917939-22660-1-git-send-email-jack@xxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, May 30, 2013 at 02:45:37PM +0200, Jan Kara wrote:
> In some configurations (e.g. 1 KB block size), ext4 can decide it is
> better to zero out several blocks rather than splitting unwritten
> extent. This changes results SEEK_HOLE / SEEK_DATA returns and thus the
> test fails. Fix the problem by disabling the feature for this test.
> 
> Signed-off-by: Jan Kara <jack@xxxxxxx>
> ---
>  tests/generic/285 | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/tests/generic/285 b/tests/generic/285
> index b700a15..8078b1c 100755
> --- a/tests/generic/285
> +++ b/tests/generic/285
> @@ -46,6 +46,12 @@ BASE_TEST_FILE=$TEST_DIR/seek_sanity_testfile
>  
>  [ -x $here/src/seek_sanity_test ] || _notrun "seek_sanitfy_tester not built"
>  
> +# Disable extent zeroing for ext4 as that change where holes are created
> +if [ "$FSTYP" = "ext4" ]; then
> +     DEV=`basename $TEST_DEV`
> +     echo 0 >/sys/fs/ext4/$DEV/extent_max_zeroout_kb
> +fi

would that be better going into _require_seek_data_hole so that 286
also picks up this behaviour for ext4?

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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