Re: [PATCH] xfstests: btrfs/308: simple sparse copy testcase for btrfs

[Eryu Guan <eguan@redhat.com>]

On Thu, May 23, 2013 at 11:36:32AM -0500, Eric Sandeen wrote:
> From: Koen De Wit <koen.de.wit@oracle.com>
> 
> # Tests file clone functionality of btrfs ("reflinks"):
> #   - Reflink a file
> #   - Reflink the reflinked file
> #   - Modify the original file
> #   - Modify the reflinked file
> 
> [sandeen: add helpers, make several mostly-cosmetic
>  changes to the original testcase]
> 
> Signed-off-by: Koen De Wit <koen.de.wit@oracle.com>
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---
> 
> Originally submitted as test 297
> 
> diff --git a/common/rc b/common/rc
> index fe6bbfc..4560715 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -2098,6 +2098,27 @@ _require_dumpe2fs()
>  	fi
>  }
>  
> +_require_cp_reflink()
> +{
> +	cp --help | grep -q reflink || \
> +		_notrun "This test requires a cp with --reflink support."
> +}
> +
> +# Given 2 files, verify that they have the same mapping but different
> +# inodes - i.e. an undisturbed reflink
> +# Silent if so, make noise if not
> +_verify_reflink()
> +{
> +	# not a hard link or symlink?
> +	cmp -s	<(stat -c '%i' $1) <(stat -c '%i' $2) \
> +		&& echo "$1 and $2 are not reflinks: same inode number"
> +
> +	# same mapping?
> +	diff -u	<($XFS_IO_PROG -F -c "fiemap" $1 | grep -v $1) \
> +		<($XFS_IO_PROG -F -c "fiemap" $2 | grep -v $2) \
> +		|| echo "$1 and $2 are not reflinks: different extents"

I'm not sure if "-F" is still needed after commit
96fce07 xfstests: automatically add -F to xfs_io on non-xfs

> +}
> +
>  _create_loop_device()
>  {
>  	file=$1
> diff --git a/tests/btrfs/308 b/tests/btrfs/308
> new file mode 100755
> index 0000000..1bb8f02
> --- /dev/null
> +++ b/tests/btrfs/308
> @@ -0,0 +1,87 @@
> +#! /bin/bash
> +# FS QA Test No. btrfs/308
> +#
> +# Tests file clone functionality of btrfs ("reflinks"):
> +#   - Reflink a file
> +#   - Reflink the reflinked file
> +#   - Modify the original file
> +#   - Modify the reflinked file
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2013, Oracle and/or its affiliates.  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`
> +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
> +
> +_cleanup()
> +{
> +    cd /
> +    rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. common/rc
> +. common/filter
> +
> +# real QA test starts here
> +_supported_fs btrfs
> +_supported_os Linux
> +
> +_require_xfs_io_fiemap
> +_require_cp_reflink
> +
> +TESTDIR1=$TEST_DIR/test-$seq
> +rm -rf $TESTDIR1
> +mkdir $TESTDIR1
> +
> +_checksum_files() {
> +    for F in original copy1 copy2
> +    do
> +        md5sum $TESTDIR1/$F | _filter_test_dir
> +    done
> +}
> +
> +rm -f $seqres.full
> +
> +echo "Create the original file and reflink to copy1, copy2"
> +$XFS_IO_PROG -F -f -c 'pwrite -S 0x61 0 9000' $TESTDIR1/original >> $seqres.full 2>&1

Here too, maybe we can drop "-F" option?

Also 309 has this issue too. 310 and 311 are fine.

Thanks,
Eryu Guan
> +cp --reflink $TESTDIR1/original $TESTDIR1/copy1
> +cp --reflink $TESTDIR1/copy1 $TESTDIR1/copy2
> +_verify_reflink $TESTDIR1/original $TESTDIR1/copy1
> +_verify_reflink $TESTDIR1/original $TESTDIR1/copy2
> +echo "Original md5sums:"
> +_checksum_files
> +
> +echo "Overwrite original file with new data"
> +$XFS_IO_PROG -c 'pwrite -S 0x62 0 9000' $TESTDIR1/original >> $seqres.full 2>&1
> +echo "md5sums after overwriting original:"
> +_checksum_files
> +
> +echo "Overwrite copy1 with different new data"
> +$XFS_IO_PROG -c 'pwrite -S 0x63 0 9000' $TESTDIR1/copy1  >> $seqres.full 2>&1
> +echo "md5sums after overwriting copy1:"
> +_checksum_files
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/btrfs/308.out b/tests/btrfs/308.out
> new file mode 100644
> index 0000000..7bccf08
> --- /dev/null
> +++ b/tests/btrfs/308.out
> @@ -0,0 +1,16 @@
> +QA output created by 308
> +Create the original file and reflink to copy1, copy2
> +Original md5sums:
> +42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-308/original
> +42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-308/copy1
> +42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-308/copy2
> +Overwrite original file with new data
> +md5sums after overwriting original:
> +4a847a25439532bf48b68c9e9536ed5b  TEST_DIR/test-308/original
> +42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-308/copy1
> +42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-308/copy2
> +Overwrite copy1 with different new data
> +md5sums after overwriting copy1:
> +4a847a25439532bf48b68c9e9536ed5b  TEST_DIR/test-308/original
> +e271cd47d9f62ebc96cb4e67ae4d16db  TEST_DIR/test-308/copy1
> +42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/test-308/copy2
> diff --git a/tests/btrfs/group b/tests/btrfs/group
> index bc6c256..f24628c 100644
> --- a/tests/btrfs/group
> +++ b/tests/btrfs/group
> @@ -9,3 +9,4 @@
>  276 auto rw metadata
>  284 auto
>  307 auto quick
> +308 auto quick reflink
> 
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