linux-ext4 - Re: [fstests PATCH 2/2] generic/347: dm-thin lacks DAX support

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Date:   Thu, 18 Jan 2018 09:06:02 -0700
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Eryu Guan <eguan@...hat.com>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-nvdimm@...ts.01.org, dave.jiang@...el.com
Subject: Re: [fstests PATCH 2/2] generic/347: dm-thin lacks DAX support

On Thu, Jan 18, 2018 at 12:23:43PM +0800, Eryu Guan wrote:
> On Wed, Jan 17, 2018 at 04:23:51PM -0700, Ross Zwisler wrote:
> > generic/347 currently fails when run in cojunction with the DAX mount
> > option:
> > 
> > generic/347 72s ... - output mismatch (see
> > /root/project/xfstests/results//generic/347.out.bad)
> >     --- tests/generic/347.out	2016-05-12 11:56:32.086618744 -0600
> >     +++ /root/project/xfstests/results//generic/347.out.bad	2018-01-17
> >     16:04:33.459348448 -0700
> >     @@ -1,2 +1,3 @@
> >      QA output created by 347
> >     +mount: /mnt/xfstests_scratch: can't read superblock on
> >     /dev/mapper/thin-vol.
> >      === completed
> >     ...
> >     (Run 'diff -u tests/generic/347.out
> >     /root/project/xfstests/results//generic/347.out.bad'  to see the entire
> >     diff)
> > 
> > This is expected because the dm-thin target currently lacks DAX support.
> > 
> > Just skip this test if we are using DAX.
> > 
> > Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> > ---
> >  tests/generic/347 | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/tests/generic/347 b/tests/generic/347
> > index 3adc6744..0c2dec98 100755
> > --- a/tests/generic/347
> > +++ b/tests/generic/347
> > @@ -72,6 +72,7 @@ _supported_fs generic
> >  _supported_os Linux
> >  _require_scratch_nocheck
> >  _require_dm_target thin-pool
> > +_exclude_scratch_mount_option dax
> 
> IMHO, it'd be better to put this in common/dmthin file, as what's done
> in common/dmerror or common/dmflakey (we grep for dax directly there,
> that's because they've been added before _exclude_scratch_mount_option
> was introduced), so all thinp tests are excluded from dax tests.

Sure, will do.  Thanks for the review.