Re: [PATCH v2 1/4] xfstests: btrfs/131: add test for an incremental send with name collision

Eryu Guan
2016-11-01T07:18:06Z

On Fri, Oct 28, 2016 at 09:44:03AM +0800, robbieko wrote:
> From: Robbie Ko <robbieko@synology.com>
>
> Test that an incremental send operation doesn't work because
> there's a name collision in the destination and it's not checked
> corretly before the rename operation applies.
>
> This test exercises scenarios used to fail in btrfs and are fixed by
> the following patch for the linux kernel:
>
> "Btrfs: incremental send, do not skip generation inconsistency check for inode 256."
>
> Signed-off-by: Robbie Ko <robbieko@synology.com>

Sorry for the late review!

> ---
> tests/btrfs/131 | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> tests/btrfs/131.out | 2 +
> tests/btrfs/group | 1 +
> 3 files changed, 114 insertions(+)
> create mode 100755 tests/btrfs/131
> create mode 100644 tests/btrfs/131.out
>
> diff --git a/tests/btrfs/131 b/tests/btrfs/131
> new file mode 100755
> index 0000000..2e2e0bc
> --- /dev/null
> +++ b/tests/btrfs/131
> @@ -0,0 +1,111 @@
> +#! /bin/bash
> +# FS QA Test No. btrfs/131
> +#
> +# Test that an incremental send operation doesn't work because
> +# there's a name collision in the destination and it's not checked
> +# corretly before the rename operation applies.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (C) 2016 Synology Inc. All Rights Reserved.
> +# Author: Robbie Ko <robbieko@synology.com>
> +#
> +# 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"
> +
> +tmp=/tmp/$$
> +status=1 # failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> + cd /
> + rm -fr $send_files_dir
> + rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# real QA test starts here
> +_supported_fs btrfs
> +_supported_os Linux
> +_require_test
> +_require_scratch
> +_require_fssum
> +
> +send_files_dir=$TEST_DIR/btrfs-test-$seq
> +
> +rm -f $seqres.full
> +rm -fr $send_files_dir
> +mkdir $send_files_dir
> +
> +_scratch_mkfs >>$seqres.full 2>&1
> +_scratch_mount
> +
> +mkdir $SCRATCH_MNT/a1
> +mkdir $SCRATCH_MNT/a2
> +
> +# Filesystem looks like:
> +#
> +# . (ino 256)
> +# |--- a1/ (ino 257)
> +# |
> +# |--- a2/ (ino 258)
> +#
> +_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1
> +
> +_run_btrfs_util_prog send $SCRATCH_MNT/mysnap1 -f $send_files_dir/1.snap

I found these "run_check" based helpers make the result harder to read
when test failed, I can't see immediate error messages from the diff
output but have to open $seqres.full file to see the details.

Can you please use $BTRFS_UTIL_PROG directly, in all these four tests?
One concern about using bare $BTRFS_UTIL_PROG is that output messages of
btrfs command are always changed. But I think, at least, we can ignore
the stdout and capture the stderr only. e.g.

$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
$SCRATCH_MNT/mysnap1 >/dev/null

So if everything works fine no output can be seen, but if snapshot
creation is failed, we can see error messages from stderr, which could
fail the test.

> +
> +_scratch_unmount
> +_scratch_mkfs >>$seqres.full 2>&1
> +_scratch_mount
> +touch $SCRATCH_MNT/a2
> +
> +# Filesystem now looks like:
> +#
> +# . (ino 256)
> +# |--- a2 (ino 257)
> +#
> +_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2
> +
> +_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/1.snap
> +rm $send_files_dir/1.snap
> +
> +run_check $FSSUM_PROG -A -f -w $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
> +run_check $FSSUM_PROG -A -f -w $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2

And this "run_check" is not necessary either. Just run $FSSUM_PROG
directly and let it print "OK", and match it in .out file.

Thanks,
Eryu

> +
> +_run_btrfs_util_prog send $SCRATCH_MNT/mysnap1 -f $send_files_dir/1.snap
> +_run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 $SCRATCH_MNT/mysnap2 \
> + -f $send_files_dir/2.snap
> +
> +# Now recreate the filesystem by receiving both send streams and verify we get
> +# the same content that the original filesystem had.
> +_scratch_unmount
> +_scratch_mkfs >>$seqres.full 2>&1
> +_scratch_mount
> +
> +_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/1.snap
> +run_check $FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
> +_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/2.snap
> +run_check $FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2
> +
> +echo "Silence is golden"
> +status=0
> +exit
> diff --git a/tests/btrfs/131.out b/tests/btrfs/131.out
> new file mode 100644
> index 0000000..d118ca9
> --- /dev/null
> +++ b/tests/btrfs/131.out
> @@ -0,0 +1,2 @@
> +QA output created by 131
> +Silence is golden
> diff --git a/tests/btrfs/group b/tests/btrfs/group
> index f3a7a4f..a7a070a 100644
> --- a/tests/btrfs/group
> +++ b/tests/btrfs/group
> @@ -133,3 +133,4 @@
> 128 auto quick send
> 129 auto quick send
> 130 auto clone send
> +131 auto quick send
> --
> 1.9.1
>
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