Re: [PATCH 1/2] Add new common filter function

[Eryu Guan <eguan@redhat.com>]

On Fri, Sep 01, 2017 at 10:14:41AM +0300, Amir Goldstein wrote:
> On Fri, Sep 1, 2017 at 10:04 AM, Eryu Guan <eguan@redhat.com> wrote:
> > On Fri, Sep 01, 2017 at 02:39:44PM +0900, Misono, Tomohiro wrote:
> >> Several tests uses both _filter_test_dir and _filter_scratch
> >> concatenated by pipe to filter $TEST_DIR and $SCRATCH_MNT. However, this
> >> would fail if the shorter string is a substring of the other (like
> >> "/mnt" and "/mnt2").
> >>
> >> This patch introduces new common filter function to safely call both
> >> _filter_test_dir and _filter_scratch.
> >>
> >> I chedked this with btrfs/029, generic/409,410,411, and generic/381,383,
> >> xfs/106,108 (which calls _filter_quota). Thanks Eryu for advice.
> >>
> >> Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
> >
> > Thanks! Though I don't think we need two separate patches, so I merged
> > the two patches together at commit time.
> >
> 
> FYI, there is still a way for a creative user to mess this up:
> 
> TEST_DEV=/test
> TEST_DIR=/test/ovl-mnt
> SCRATCH_DEV=/ovl
> SCRATCH_MNT=/ovl/ovl-mnt
> 
> $SCRATCH_DEV is a substring of $TEST_DIR
> and _filter_scratch is run first.
> 
> It's not that crazy to get to this config with the 'new'
> -overlay command, e.g.:
> TEST_DEV=/dev/sda
> TEST_DIR=/test
> SCRATCH_DEV=/dev/sdb
> SCRATCH_MNT=/ovl
> 
> Will be auto converted to the values above.

Yeah, overlay makes it more complicated.

> 
> This patch didn't break this use case.

Good to know! I just tested this config with a quick overlay tests run,
it did pass.

Seems like we need some tests for fstests itself, like
./check selftest ? :)

Thanks,
Eryu

> 
> >> ---
> >>  common/filter | 11 +++++++++++
> >>  1 file changed, 11 insertions(+)
> >>
> >> diff --git a/common/filter b/common/filter
> >> index 1ef342b..75570f9 100644
> >> --- a/common/filter
> >> +++ b/common/filter
> >> @@ -295,6 +295,17 @@ _filter_scratch()
> >>           -e "/.use_space/d"
> >>  }
> >>
> >> +_filter_testdir_and_scratch()
> >> +{
> >> +     # filter both $TEST_DIR and $SCRATCH_MNT, but always filter the longer
> >> +     # string first if the other string is a substring of the first one
> >> +     if echo "$TEST_DIR" | grep -q "$SCRATCH_MNT"; then
> >> +       _filter_test_dir | _filter_scratch
> >> +     else
> >> +       _filter_scratch | _filter_test_dir
> >
> > And fixed the indention here, used tab :)
> >
> > Thanks,
> > Eryu
> >
> >> +     fi
> >> +}
> >> +
> >>  # Turn any device in the scratch pool into SCRATCH_DEV
> >>  _filter_scratch_pool()
> >>  {
> >> --
> >> 2.9.5
> >>
> > --
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