Re: [PATCH] xfs: test a regression in dquot type checking

["Darrick J. Wong" <djwong@kernel.org>]

On Sun, Feb 07, 2021 at 11:14:39PM +0800, Eryu Guan wrote:
> On Tue, Feb 02, 2021 at 11:41:58AM -0800, Darrick J. Wong wrote:
> > From: Darrick J. Wong <djwong@kernel.org>
> > 
> > This is a regression test for incorrect ondisk dquot type checking that
> > was introduced in Linux 5.9.  The bug is that we can no longer switch a
> > V4 filesystem from having group quotas to having project quotas (or vice
> > versa) without logging corruption errors.  That is a valid use case, so
> > add a regression test to ensure this can be done.
> > 
> > Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> > ---
> >  tests/xfs/766     |   63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tests/xfs/766.out |    5 ++++
> >  tests/xfs/group   |    1 +
> >  3 files changed, 69 insertions(+)
> >  create mode 100755 tests/xfs/766
> >  create mode 100644 tests/xfs/766.out
> > 
> > diff --git a/tests/xfs/766 b/tests/xfs/766
> > new file mode 100755
> > index 00000000..55bc03af
> > --- /dev/null
> > +++ b/tests/xfs/766
> > @@ -0,0 +1,63 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0-or-later
> > +# Copyright (c) 2021 Oracle.  All Rights Reserved.
> > +#
> > +# FS QA Test No. 766
> > +#
> > +# Regression test for incorrect validation of ondisk dquot type flags when
> > +# we're switching between group and project quotas while mounting a V4
> > +# filesystem.  This test doesn't actually force the creation of a V4 fs because
> > +# even V5 filesystems ought to be able to switch between the two without
> > +# triggering corruption errors.
> > +#
> > +# The appropriate XFS patch is:
> > +# xfs: fix incorrect root dquot corruption error when switching group/project
> > +# quota types
> > +
> > +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 -f $tmp.*
> > +}
> > +
> > +# get standard environment, filters and checks
> > +. ./common/rc
> > +. ./common/quota
> > +
> > +# real QA test starts here
> > +_supported_fs xfs
> > +_require_xfs_debug
> > +_require_quota
> > +_require_scratch
> 
> Also need _require_check_dmesg
> 
> > +
> > +rm -f $seqres.full
> > +
> > +echo "Format filesystem" | tee -a $seqres.full
> > +_scratch_mkfs > $seqres.full
> > +
> > +echo "Mount with project quota" | tee -a $seqres.full
> > +_qmount_option 'prjquota'
> > +_qmount
> > +_require_prjquota $SCRATCH_DEV
> > +
> > +echo "Mount with group quota" | tee -a $seqres.full
> > +_qmount_option 'grpquota'
> > +_qmount
> > +$here/src/feature -G $SCRATCH_DEV || echo "group quota didn't mount?"
> > +
> > +echo "Check dmesg for corruption"
> > +_check_dmesg_for corruption && \
> > +	echo "should not have seen corruption messages"
> 
> I'd do the following to print the dmesg in question as well, so we know
> what is actually failing the test.
> 
> _dmesg_since_test_start | grep corruption
> 
> A failure will look like
> 
>     --- tests/xfs/527.out       2021-02-07 23:00:46.679485872 +0800
>     +++ /root/workspace/xfstests/results//xfs_4k/xfs/527.out.bad        2021-02-07 23:10:16.745371039 +0800
>     @@ -3,3 +3,5 @@
>      Mount with project quota
>      Mount with group quota
>      Check dmesg for corruption
>     +[1211043.882535] XFS (dm-5): Metadata corruption detected at xfs_dquot_from_disk+0x1b4/0x1f0 [xfs], quota 0
>     +[1211043.890173] XFS (dm-5): Metadata corruption detected at xfs_dquot_from_disk+0x1b4/0x1f0 [xfs], quota 0
>     ...
> 
> I'll fix both on commit.

Oh!  Thank you!

--D

> Thanks,
> Eryu
> 
> > +
> > +# success, all done
> > +status=0
> > +exit
> > diff --git a/tests/xfs/766.out b/tests/xfs/766.out
> > new file mode 100644
> > index 00000000..18bd99f0
> > --- /dev/null
> > +++ b/tests/xfs/766.out
> > @@ -0,0 +1,5 @@
> > +QA output created by 766
> > +Format filesystem
> > +Mount with project quota
> > +Mount with group quota
> > +Check dmesg for corruption
> > diff --git a/tests/xfs/group b/tests/xfs/group
> > index fb78b0d7..cdca04b5 100644
> > --- a/tests/xfs/group
> > +++ b/tests/xfs/group
> > @@ -545,6 +545,7 @@
> >  763 auto quick rw realtime
> >  764 auto quick repair
> >  765 auto quick quota
> > +766 auto quick quota
> >  908 auto quick bigtime
> >  909 auto quick bigtime quota
> >  910 auto quick inobtcount