linux-kernel - Re: [PATCH xfstests v2] overlay: Enable character device to be the base fs partition

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Date:   Tue, 24 Sep 2019 20:17:33 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Zhihao Cheng <chengzhihao1@...wei.com>
Cc:     guaneryu@...il.com, amir73il@...il.com,
        david.oberhollenzer@...ma-star.at, ebiggers@...gle.com,
        yi.zhang@...wei.com, fstests@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH xfstests v2] overlay: Enable character device to be the
 base fs partition

On Tue, Sep 24, 2019 at 08:05:50PM -0700, Darrick J. Wong wrote:
> On Wed, Sep 25, 2019 at 09:54:08AM +0800, Zhihao Cheng wrote:
> > There is a message in _supported_fs():
> >     _notrun "not suitable for this filesystem type: $FSTYP"
> > for when overlay usecases are executed on a chararcter device based base
> 
> You can do that?
> 
> What does that even look like?

OH, ubifs.  Ok.

/me wonders if there are more places in xfstests with test -b that needs
fixing...

--D

> --D
> 
> > fs. _overay_config_override() detects that the current base fs partition
> > is not a block device, and FSTYP won't be overwritten as 'overlay' before
> > executing usecases which results in all overlay usecases become 'notrun'.
> > In addition, all generic usecases are based on base fs rather than overlay.
> > 
> > We want to rewrite FSTYP to 'overlay' before running the usecases. To do
> > this, we need to add additional character device judgments for TEST_DEV
> > and SCRATCH_DEV in _overay_config_override().
> > 
> > Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
> > ---
> >  common/config | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/common/config b/common/config
> > index 4c86a49..a22acdb 100644
> > --- a/common/config
> > +++ b/common/config
> > @@ -550,7 +550,7 @@ _overlay_config_override()
> >  	#    the new OVL_BASE_SCRATCH/TEST_DEV/MNT vars are set to the values
> >  	#    of the configured base fs and SCRATCH/TEST_DEV vars are set to the
> >  	#    overlayfs base and mount dirs inside base fs mount.
> > -	[ -b "$TEST_DEV" ] || return 0
> > +	[ -b "$TEST_DEV" ] || [ -c "$TEST_DEV" ] || return 0
> >  
> >  	# Config file may specify base fs type, but we obay -overlay flag
> >  	[ "$FSTYP" == overlay ] || export OVL_BASE_FSTYP="$FSTYP"
> > @@ -570,7 +570,7 @@ _overlay_config_override()
> >  	export TEST_DIR="$OVL_BASE_TEST_DIR/$OVL_MNT"
> >  	export MOUNT_OPTIONS="$OVERLAY_MOUNT_OPTIONS"
> >  
> > -	[ -b "$SCRATCH_DEV" ] || return 0
> > +	[ -b "$SCRATCH_DEV" ] || [ -c "$SCRATCH_DEV" ] || return 0
> >  
> >  	# Store original base fs vars
> >  	export OVL_BASE_SCRATCH_DEV="$SCRATCH_DEV"
> > -- 
> > 2.7.4
> >