Re: test getbmap on reflinked files

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Sun, Sep 03, 2017 at 02:14:51PM +0200, Christoph Hellwig wrote:
> Test that we correctly report shared and unshared regions in a file.
> 
> To do so we also update _filter_bmap to include the shared flag.
> 
> Based on a test case from Darrick Wong.

Which test case is that?

Mostly I'm wondering how does this differ from xfs/280?

> Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> diff --git a/common/punch b/common/punch
> index c4ed261..3c400c1 100644
> --- a/common/punch
> +++ b/common/punch
> @@ -263,6 +263,10 @@ _filter_bmap()
>  			print $1, $2, $3;
>  			next;
>  		}
> +		$7 ~ /1[01][01][01][01][01]/ {
> +			print $1, $2, "shared";
> +			next;
> +		}
>  		$7 ~ /1[01][01][01][01]/ {
>  			print $1, $2, "unwritten";
>  			next;
> diff --git a/tests/xfs/115 b/tests/xfs/115
> new file mode 100755
> index 0000000..eb456dc
> --- /dev/null
> +++ b/tests/xfs/115
> @@ -0,0 +1,88 @@
> +#! /bin/bash
> +# FS QA Test 115
> +#
> +# Check getbmap reporting for reflinked files
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2017 Christoph Hellwig.  All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> +#-----------------------------------------------------------------------
> +#
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +file=$TEST_DIR/${seq}.file
> +clone=$TEST_DIR/${seq}.clone
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +	rm -f ${file} ${clone}
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +. ./common/reflink
> +. ./common/punch
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs xfs
> +_supported_os Linux
> +_require_test
> +_require_test_reflink
> +_require_cp_reflink
> +
> +# write file and check extent map
> +touch ${file}
> +xfs_io -c 'pwrite 0 1m' \

$XFS_IO_PROG -c ...

> +	-c 'fsync' ${file} >/dev/null
> +echo "initial file layout:"
> +xfs_io -c 'bmap -elpv' ${file} | _filter_test_dir | _filter_bmap
> +echo
> +
> +# reflink file and check for the shared bit in the extent map
> +cp --reflink=always ${file} ${clone} >/dev/null

_cp_reflink

> +echo "layout after reflink"
> +xfs_io -c 'bmap -elpv' ${file} | _filter_test_dir | _filter_bmap
> +echo
> +
> +# break COW and check the shared split in the extent map
> +xfs_io -c 'pwrite 200k 4k' \
> +	-c 'pwrite 700k 4k' \
> +	-c 'fsync' ${clone} | >/dev/null
> +echo "layout after partial unshare:"
> +xfs_io -c 'bmap -elpv' ${file} | _filter_test_dir | _filter_bmap
> +
> +# optional stuff if your test has verbose output to help resolve problems
> +#echo
> +#echo "If failure, check $seqres.full (this) and $seqres.full.ok (reference)"

Unneeded...?

--D

> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/xfs/115.out b/tests/xfs/115.out
> new file mode 100644
> index 0000000..45e1d3c
> --- /dev/null
> +++ b/tests/xfs/115.out
> @@ -0,0 +1,13 @@
> +QA output created by 115
> +initial file layout:
> +0: [0..2047]: data
> +
> +layout after reflink
> +0: [0..2047]: shared
> +
> +layout after partial unshare:
> +0: [0..399]: shared
> +1: [400..407]: data
> +2: [408..1399]: shared
> +3: [1400..1407]: data
> +4: [1408..2047]: shared
> diff --git a/tests/xfs/group b/tests/xfs/group
> index 5c02498..97d6eee 100644
> --- a/tests/xfs/group
> +++ b/tests/xfs/group
> @@ -112,6 +112,7 @@
>  112 fuzzers
>  113 fuzzers
>  114 auto rw dangerous
> +115 auto quick ioctl clone
>  116 quota auto quick
>  117 fuzzers
>  118 auto quick fsr dangerous
> --
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