Re: [PATCH v3] xfstests: add test for truncate/collapse range race

["gux.fnst" <gux.fnst@cn.fujitsu.com>]

Hi, Dave

    I'd like to know whether this test case is meaningful for xfstests.
If it is not, I will drop it.
    Thanks!

Regards,
Xing Gu

On 09/30/2014 05:50 PM, Xing Gu wrote:
> This case tests truncate/collapse range race. If
> the race occurs, it will trigger BUG_ON.
> 
> Signed-off-by: Xing Gu <gux.fnst@cn.fujitsu.com>
> ---
>   tests/generic/326     | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++
>   tests/generic/326.out |  1 +
>   tests/generic/group   |  1 +
>   3 files changed, 79 insertions(+)
>   create mode 100755 tests/generic/326
>   create mode 100644 tests/generic/326.out
> 
> diff --git a/tests/generic/326 b/tests/generic/326
> new file mode 100755
> index 0000000..c24e3ba
> --- /dev/null
> +++ b/tests/generic/326
> @@ -0,0 +1,77 @@
> +#! /bin/bash
> +# FS QA Test No. 326
> +#
> +# Test truncate/collapse range race.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2014 Fujitsu.  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!
> +
> +_cleanup()
> +{
> +    rm -f $tmp.*
> +}
> +
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# real QA test starts here
> +_supported_os Linux
> +_supported_fs generic
> +_require_scratch
> +_require_xfs_io_command "fcollapse"
> +
> +_scratch_mkfs > $seqres.full 2>&1
> +_scratch_mount
> +
> +old_bug=`dmesg | grep -c "kernel BUG"`
> +
> +testfile=$SCRATCH_MNT/file.$seq
> +# fcollapse/truncate continuously and simultaneously
> +# a same file
> +for ((i=1; i <= 100; i++))
> +do
> +	for ((i=1; i <= 1000; i++))
> +	do
> +		$XFS_IO_PROG -f -c 'truncate 100k' $testfile 2>> $seqres.full
> +		$XFS_IO_PROG -f -c 'fcollapse 0 16k' $testfile 2>> $seqres.full
> +	done &
> +	for ((i=1; i <= 1000; i++))
> +	do
> +		$XFS_IO_PROG -f -c 'truncate 0' $testfile 2>> $seqres.full
> +	done &
> +done
> +
> +wait
> +
> +new_bug=`dmesg | grep -c "kernel BUG"`
> +if [ $new_bug -ne $old_bug ]; then
> +	echo "kernel bug detected, check dmesg for more infomation."
> +fi
> +
> +status=0 ; exit
> diff --git a/tests/generic/326.out b/tests/generic/326.out
> new file mode 100644
> index 0000000..90a76cc
> --- /dev/null
> +++ b/tests/generic/326.out
> @@ -0,0 +1 @@
> +QA output created by 326
> diff --git a/tests/generic/group b/tests/generic/group
> index 799bfd8..5ef8acb 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -151,3 +151,4 @@
>   323 auto aio stress
>   324 auto fsr quick
>   325 auto quick data log
> +326 auto
>