Re: [PATCH 2/2] generic: test shutdowns of a nested filesystem

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

On Sun, Aug 22, 2021 at 07:18:49PM +0800, Eryu Guan wrote:
> On Tue, Aug 17, 2021 at 04:53:25PM -0700, Darrick J. Wong wrote:
> > From: Darrick J. Wong <djwong@kernel.org>
> > 
> > generic/475, but we're running fsstress on a disk image inside the
> > scratch filesystem
> > 
> > Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> > ---
> >  common/rc             |   20 +++++++
> >  tests/generic/725     |  136 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  tests/generic/725.out |    2 +
> >  3 files changed, 158 insertions(+)
> >  create mode 100755 tests/generic/725
> >  create mode 100644 tests/generic/725.out
> > 
> > 
> > diff --git a/common/rc b/common/rc
> > index 84757fc1..473bfb0a 100644
> > --- a/common/rc
> > +++ b/common/rc
> > @@ -631,6 +631,26 @@ _ext4_metadump()
> >  		$DUMP_COMPRESSOR -f "$dumpfile" &>> "$seqres.full"
> >  }
> >  
> > +# Capture the metadata of a filesystem in a dump file for offline analysis
> > +_metadump_dev() {
> > +	local device="$1"
> > +	local dumpfile="$2"
> > +	local compressopt="$3"
> > +
> > +	case "$FSTYP" in
> > +	ext*)
> > +		_ext4_metadump $device $dumpfile $compressopt
> > +		;;
> > +	xfs)
> > +		_xfs_metadump $dumpfile $device none $compressopt
> > +		;;
> > +	*)
> > +		echo "Don't know how to metadump $FSTYP"
> 
> This breaks tests on filesystems other than ext* and xfs. I think it's
> OK if we only want to use it in failure path, but it's better to
> describe the use case in comments.

Ok, I'll make a note of that in the comment.

"Capture the metadata of a filesystem in a dump file for offline
analysis.  Not all filesystems support this, so this function should
only be used to capture information about a previous test failure."

> And Im' wondering if should honor DUMP_CORRUPT_FS, and only do the dump
> when it's set.

Yes.  Will fix that in the next release.

--D

> Thanks,
> Eryu