Re: [PATCH 14/14] generic: test IO at maximum file offset

[Eryu Guan <eguan@redhat.com>]

On Wed, Nov 01, 2017 at 02:47:54PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> Make sure we can write to and read from the highest possible offset
> that Linux will allow.  Format the filesystem with a variety of
> possible blocksizes to stress the filesystem.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
>  tests/generic/705     |   97 +++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/705.out |    2 +
>  tests/generic/group   |    1 +
>  3 files changed, 100 insertions(+)
>  create mode 100755 tests/generic/705
>  create mode 100644 tests/generic/705.out
> 
> 
> diff --git a/tests/generic/705 b/tests/generic/705
> new file mode 100755
> index 0000000..4ab97e5
> --- /dev/null
> +++ b/tests/generic/705
> @@ -0,0 +1,97 @@
> +#! /bin/bash
> +# FS QA Test No. 705
> +#
> +# Check that high-offset reads and writes work.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2017, 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 $0`
> +seqres=$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
> +
> +_cleanup()
> +{
> +    cd /
> +    rm -rf $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# real QA test starts here
> +_supported_os Linux
> +_require_scratch

As we do _check_scratch_fs after each loop, _require_scratch_nocheck
should be OK here.

> +
> +rm -f $seqres.full
> +
> +echo "Silence is golden"
> +
> +echo "Starting test" > $seqres.full
> +for blocksize in 512 1024 2048 4096 8192 16384 32768 65536; do
> +	echo "+ Format blocksize $blocksize and mount" >> $seqres.full
> +	devsize=$(blockdev --getsize64 $SCRATCH_DEV)
> +	_scratch_unmount > /dev/null 2>&1
> +	# Try to format and mount with the given blocksize.  If they don't
> +	# succeed, move on to the next block size.
> +	if ! _scratch_mkfs_sized $devsize $blocksize >> $seqres.full 2>&1 ||
> +	   ! _scratch_mount >> $seqres.full 2>&1 ||
> +	   test "$(stat -f -c '%S' $SCRATCH_MNT)" -ne "$blocksize"; then
> +		echo "+++ Format and mount failed" >> $seqres.full
> +		continue

We need to unset MKFS_OPTIONS before this loop, because
_scratch_mkfs_sized takes the block size specified in MKFS_OPTIONS as
the default size and ignores the second argument, the provided block
size is only used if no block size specified in MKFS_OPTIONS.

> +	fi
> +
> +	testdir=$SCRATCH_MNT/test-$seq
> +	mkdir $testdir
> +
> +	echo "++ Create the original files" >> $seqres.full
> +	bigoff=9223372036854775806
> +	len=9223372036854775807

Calculating the numbers might be easier to read, e.g.

	len=`echo "2^63-1" | $BC_PROG`
	bigoff=`echo "$len-1" | $BC_PROG`

Thanks,
Eryu

> +	$XFS_IO_PROG -f -c "truncate $len" $testdir/file0 >> $seqres.full 2>&1
> +	if [ ! -s $testdir/file0 ]; then
> +		# If we can't set a large file size then don't bother
> +		# with this blocksize because the fs doesn't support it.
> +		echo "+++ High offset ftruncate failed" >> $seqres.full
> +		continue
> +	fi
> +	_pwrite_byte 0x61 $bigoff 1 $testdir/file1 >> $seqres.full
> +
> +	echo "++ Check file creation" >> $seqres.full
> +	_scratch_cycle_mount
> +
> +	expected="7ffffffffffffffe:  61  a"
> +	actual="$($XFS_IO_PROG -c "pread -v -q $bigoff 1" $testdir/file1)"
> +	if [ "$expected" = "$actual" ]; then
> +		echo "+++ Success!" >> $seqres.full
> +	else
> +		echo "+++ Discrepancy @ blocksize $blocksize" >> $seqres.full
> +		echo "Discrepancy @ blocksize $blocksize"
> +	fi
> +
> +	echo "++ Check scratchfs" >> $seqres.full
> +	_check_scratch_fs
> +done
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/705.out b/tests/generic/705.out
> new file mode 100644
> index 0000000..6fcdec0
> --- /dev/null
> +++ b/tests/generic/705.out
> @@ -0,0 +1,2 @@
> +QA output created by 705
> +Silence is golden
> diff --git a/tests/generic/group b/tests/generic/group
> index fbe0a7f..2c55b93 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -468,3 +468,4 @@
>  463 auto quick clone dangerous
>  464 auto rw
>  465 auto rw quick aio
> +705 auto quick rw
>