Re: [PATCH V2 1/3] dax/dm: disable testing on devices that don't support dax

[Eryu Guan <guaneryu@gmail.com>]

On Fri, Feb 21, 2020 at 05:48:01PM +0800, Zorro Lang wrote:
> On Thu, Feb 20, 2020 at 03:06:30PM -0500, Jeff Moyer wrote:
> > Move the check for dax from the individual target scripts into
> > _require_dm_target.  This fixes up a couple of missed tests that are
> > failing due to the lack of dax support (such as tests requiring
> > dm-snapshot).
> > 
> > Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
> > ---
> >  common/dmdelay  |  5 -----
> >  common/dmerror  |  5 -----
> >  common/dmflakey |  5 -----
> >  common/dmthin   |  5 -----
> >  common/rc       | 11 +++++++++++
> >  5 files changed, 11 insertions(+), 20 deletions(-)
> > 
> > diff --git a/common/dmdelay b/common/dmdelay
> > index f1e725b9..66cac1a7 100644
> > --- a/common/dmdelay
> > +++ b/common/dmdelay
> > @@ -7,11 +7,6 @@
> >  DELAY_NONE=0
> >  DELAY_READ=1
> >  
> > -echo $MOUNT_OPTIONS | grep -q dax
> > -if [ $? -eq 0 ]; then
> > -	_notrun "Cannot run tests with DAX on dmdelay devices"
> > -fi
> > -
> >  _init_delay()
> >  {
> >  	local BLK_DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`
> > diff --git a/common/dmerror b/common/dmerror
> > index 426f1e96..7d12e0a1 100644
> > --- a/common/dmerror
> > +++ b/common/dmerror
> > @@ -4,11 +4,6 @@
> >  #
> >  # common functions for setting up and tearing down a dmerror device
> >  
> > -echo $MOUNT_OPTIONS | grep -q dax
> > -if [ $? -eq 0 ]; then
> > -	_notrun "Cannot run tests with DAX on dmerror devices"
> > -fi
> > -
> >  _dmerror_setup()
> >  {
> >  	local dm_backing_dev=$SCRATCH_DEV
> > diff --git a/common/dmflakey b/common/dmflakey
> > index 2af3924d..b4e11ae9 100644
> > --- a/common/dmflakey
> > +++ b/common/dmflakey
> > @@ -8,11 +8,6 @@ FLAKEY_ALLOW_WRITES=0
> >  FLAKEY_DROP_WRITES=1
> >  FLAKEY_ERROR_WRITES=2
> >  
> > -echo $MOUNT_OPTIONS | grep -q dax
> > -if [ $? -eq 0 ]; then
> > -	_notrun "Cannot run tests with DAX on dmflakey devices"
> > -fi
> > -
> >  _init_flakey()
> >  {
> >  	local BLK_DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`
> > diff --git a/common/dmthin b/common/dmthin
> > index 7946e9a7..61dd6f89 100644
> > --- a/common/dmthin
> > +++ b/common/dmthin
> > @@ -21,11 +21,6 @@ DMTHIN_POOL_DEV="/dev/mapper/$DMTHIN_POOL_NAME"
> >  DMTHIN_VOL_NAME="thin-vol"
> >  DMTHIN_VOL_DEV="/dev/mapper/$DMTHIN_VOL_NAME"
> >  
> > -echo $MOUNT_OPTIONS | grep -q dax
> > -if [ $? -eq 0 ]; then
> > -	_notrun "Cannot run tests with DAX on dmthin devices"
> > -fi
> > -
> >  _dmthin_cleanup()
> >  {
> >  	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
> > diff --git a/common/rc b/common/rc
> > index eeac1355..65cde32b 100644
> > --- a/common/rc
> > +++ b/common/rc
> > @@ -1874,6 +1874,17 @@ _require_dm_target()
> >  	_require_sane_bdev_flush $SCRATCH_DEV
> >  	_require_command "$DMSETUP_PROG" dmsetup
> >  
> > +	echo $MOUNT_OPTIONS | grep -q dax
> > +	if [ $? -eq 0 ]; then
> > +		case $target in
> > +		stripe|linear|log-writes)
> 
> I've checked all cases which import ./common/dm.* (without dmapi), they all
> has _require_dm_target. So this patch is good to me.

So can I add "Reviewed-by: Zorro Lang <zlang@redhat.com>" to all these
three patches? :)

Thanks for the review!

Eryu
> 
> And by checking current linux source code:
> 
>   0 dm-linear.c      226 .direct_access = linear_dax_direct_access,
>   1 dm-log-writes.c 1016 .direct_access = log_writes_dax_direct_access,
>   2 dm-stripe.c      486 .direct_access = stripe_dax_direct_access,
>   3 dm-target.c      159 .direct_access = io_err_dax_direct_access,
> 
> Only linear, stripe and log-writes support direct_access.
> 
> Thanks,
> Zorro
> 
> > +			;;
> > +		*)
> > +			_notrun "Cannot run tests with DAX on $target devices."
> > +			;;
> > +		esac
> > +	fi
> > +
> >  	modprobe dm-$target >/dev/null 2>&1
> >  
> >  	$DMSETUP_PROG targets 2>&1 | grep -q ^$target
> > -- 
> > 2.19.1
> > 
>