linux-ext4 - Re: [PATCH 1/3 v2] XFS TESTS: Fix 252 Failure: Relax fiemap filter

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Date:	Tue, 28 Jun 2011 14:59:03 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Allison Henderson <achender@...ux.vnet.ibm.com>
Cc:	xfs@....sgi.com, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/3 v2] XFS TESTS: Fix 252 Failure: Relax fiemap filter

On Mon, Jun 27, 2011 at 09:27:25PM -0700, Allison Henderson wrote:
> The current test 252 tests punch hole by collecting fiemap information
> on the test file.  However this does not work for all file systems since
> not all file systems layout their extents in the same way.
> 
> This patch corrects this by adding a -h flag to the fiemap filter that ignores
> the extent types in the fiemaps.  The result is that the fiemap contains only
> "extent" or "hole", instead of "unwritten", "data" or "hole".  A checksum has
> also been added to each test to help ensure the file contents are correct.
> 
> Signed-off-by: Allison Henderson <achender@...ux.vnet.ibm.com>
> ---
> v1 -> v2
> Moved new golden output for 252 into a seperate patch to help make the set
> easier to read
> 
> :100755 100755 5efa243... 1289094... M	252
> :100644 100644 ddf63b0... d3c89eb... M	common.punch
>  252          |    8 ++++----
>  common.punch |   38 ++++++++++++++++++++++++++++++++++++--
>  2 files changed, 40 insertions(+), 6 deletions(-)
> 
> diff --git a/252 b/252
> index 5efa243..1289094 100755
> --- a/252
> +++ b/252
> @@ -53,15 +53,15 @@ _require_xfs_io_fiemap
>  testfile=$TEST_DIR/252.$$
>  
>  # Standard punch hole tests
> -_test_generic_punch falloc fpunch fpunch fiemap _filter_fiemap $testfile -F
> +_test_generic_punch falloc fpunch fpunch fiemap "_filter_fiemap -h" $testfile -F
>  
>  # Delayed allocation punch hole tests
> -_test_generic_punch -d falloc fpunch fpunch fiemap _filter_fiemap $testfile -F
> +_test_generic_punch -d falloc fpunch fpunch fiemap "_filter_fiemap -h" $testfile -F
>  
>  # Multi hole punch tests
> -_test_generic_punch -k falloc fpunch fpunch fiemap _filter_fiemap $testfile -F
> +_test_generic_punch -k falloc fpunch fpunch fiemap "_filter_fiemap -h" $testfile -F
>  
>  # Delayed allocation multi punch hole tests
> -_test_generic_punch -d -k falloc fpunch fpunch fiemap _filter_fiemap $testfile -F
> +_test_generic_punch -d -k falloc fpunch fpunch fiemap "_filter_fiemap -h" $testfile -F
>  
>  status=0 ; exit
> diff --git a/common.punch b/common.punch
> index ddf63b0..d3c89eb 100644
> --- a/common.punch
> +++ b/common.punch
> @@ -203,17 +203,34 @@ _coalesce_extents()
>  
>  _filter_fiemap()
>  {
> +
> +	UNWRITTEN_EX="\"unwritten\""
> +	DATA_EX="\"data\""
> +	OPTIND=1
> +	while getopts 'h' OPTION
> +	do
> +		case $OPTION in
> +		h)      UNWRITTEN_EX="\"extent\""
> +			DATA_EX="\"extent\""
> +		;;
> +		?)      echo Invalid flag
> +		exit 1
> +		;;
> +		esac
> +	done
> +	shift $(($OPTIND - 1))
> +
>  	awk --posix '
>  		$3 ~ /hole/ {
>  			print $1, $2, $3;
>  			next;
>  		}
>  		$5 ~ /0x[[:digit:]]*8[[:digit:]]{2}/ {
> -			print $1, $2, "unwritten";
> +			print $1, $2, '$UNWRITTEN_EX';
>  			next;
>  		}
>  		$5 ~ /0x[[:digit:]]+/ {
> -			print $1, $2, "data";
> +			print $1, $2, '$DATA_EX';
>  		}' |
>  	_coalesce_extents
>  }

I seriously dislike conditional parameter passing in shell scripts
at the best of times, but for filter functions I really think it is
the wrong thing to do. It significantly obfuscates the working of
the function for no really good reason.

Just write a new filter function, and factor out the common parts of
them if the amount of code duplication is sufficient to make it
desirable to do so.

> +	md5sum $testfile | cut -d ' ' -f1

Why cut out the file name? It's not like it changes at all....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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