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Re: [PATCH v3] xfstests: btrfs/316: cross-subvolume sparse copy

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH v3] xfstests: btrfs/316: cross-subvolume sparse copy
From: Koen De Wit <koen.de.wit@xxxxxxxxxx>
Date: Tue, 02 Jul 2013 16:27:07 +0200
Cc: Eric Sandeen <sandeen@xxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130702101539.GC14996@dastard>
References: <51D29D17.3050000@xxxxxxxxxx> <20130702101539.GC14996@dastard>
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20111110 Icedove/3.0.11

Thanks for the review. I will clean up the commit message and do a full 
mail-to-myself-and-test-patch round trip to avoid errors like the wrong test 
numbers in the golden output. I'm sorry for this.

About cutting out file names from the output. I did this in the first version 
of the patch:

       md5sum $TESTDIR1/$F | $AWK_PROG 'END {print $1}'

but Eric Sandeen suggested to include them in order to provide more context in 
the output. (See http://oss.sgi.com/archives/xfs/2013-03/msg00231.html and 
http://oss.sgi.com/archives/xfs/2013-03/msg00220.html) That sounds like a good 
idea to me, it makes debugging failures easier. Whose opinion should I follow?


On 07/02/2013 12:15 PM, Dave Chinner wrote:

> On Tue, Jul 02, 2013 at 11:27:51AM +0200, Koen De Wit wrote:
>> This testscript creates reflinks to files on different subvolumes, 
>> overwrites the original files and reflinks, and moves reflinked files 
>> between subvolumes.
>> Originally submitted as testcase 302, changes are made based on comments 
>> from Eric: http://oss.sgi.com/archives/xfs/2013-03/msg00231.html
>> Two new common/rc functions used in this script (_require_cp_reflink and 
>> _verify_reflink) have been submitted recently: 
>> http://oss.sgi.com/archives/xfs/2013-05/msg00745.html
>> Thanks to Eric Sandeen and Dave Chinner for the reviews.
>> Version 3: fixing wrapped patch.
> Needs a proper commit message - wrap it at 72 columns,  change log
> should be placed below the --- devider, not be part of hte commit
> message.
> Test numbers do not need to be unique across all test directories,
> just unique within the tests/btrfs directory.
>> +
>> +_checksum_files() {
>> +    for F in file1 file2 file3
>> +    do
>> +        for D in $TESTDIR1 $SCRATCH_MNT $SUBVOL2
>> +        do
>> +            md5sum $D/$F | _filter_test_dir | _filter_scratch
> Just cut the file name out. No need for filtering at that point...
>> +        done
>> +    done
>> +}
>> +
>> +TESTDIR1=$TEST_DIR/test-$seq-1
>> +TESTDIR2=$TEST_DIR/test-$seq-2
>> +SUBVOL1=$TEST_DIR/subvol-$seq-1
>> +SUBVOL2=$TEST_DIR/subvol-$seq-2
> ....-316-.....
>> +Verify the file contents:
>> +e09c80c42fda55f9d992e59ca6b3307d  TEST_DIR/test-302-1/file1
> which means the golden output is broken, despite the filtering
> You should test your patches before posting ;)
> FWIW, this is why you should simply cut the filename completely out
> like we do elsewhere....
> Cheers,
> Dave.

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