Re: [PATCH 1/8] tests/9pfs: simplify fs_mkdir()

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Dienstag, 20. Oktober 2020 20:03:09 CEST Greg Kurz wrote:
> On Tue, 20 Oct 2020 15:43:21 +0200
> 
> Christian Schoenebeck <qemu_oss@crudebyte.com> wrote:
> > On Dienstag, 20. Oktober 2020 15:35:36 CEST Greg Kurz wrote:
> > > On Tue, 20 Oct 2020 01:13:23 +0200
> > > 
> > > Christian Schoenebeck <qemu_oss@crudebyte.com> wrote:
> > > > Split out walking a directory path to a separate new utility function
> > > > fs_walk_fid() and use that function in fs_mkdir().
> > > > 
> > > > The code difference saved this way is not much, but we'll use that new
> > > > fs_walk_fid() function in the upcoming patches, so it will avoid quite
> > > > some code duplication after all.
> > > > 
> > > > Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
> > > > ---
> > > > 
> > > >  tests/qtest/virtio-9p-test.c | 23 ++++++++++++++++++-----
> > > >  1 file changed, 18 insertions(+), 5 deletions(-)
> > > > 
> > > > diff --git a/tests/qtest/virtio-9p-test.c
> > > > b/tests/qtest/virtio-9p-test.c
> > > > index c15908f27b..dc724bbb1e 100644
> > > > --- a/tests/qtest/virtio-9p-test.c
> > > > +++ b/tests/qtest/virtio-9p-test.c
> > > > @@ -967,13 +967,12 @@ static void fs_flush_ignored(void *obj, void
> > > > *data,
> > > > QGuestAllocator *t_alloc)>
> > > > 
> > > >      g_free(wnames[0]);
> > > >  
> > > >  }
> > > > 
> > > > -static void fs_mkdir(void *obj, void *data, QGuestAllocator *t_alloc,
> > > > -                     const char *path, const char *cname)
> > > > +/* utility function: walk to requested dir and return fid for that
> > > > dir */
> > > > +static uint32_t fs_walk_fid(void *obj, void *data, QGuestAllocator
> > > > *t_alloc, +                            const char *path)
> > > > 
> > > >  {
> > > 
> > > Since fs_walk_fid() is a helper function, ie. not passed to
> > > qos_add_test(),
> > > any reason to keep the "void *obj, void *data, QGuestAllocator *t_alloc"
> > > based signature ? data and t_alloc aren't used at all and it seems that
> > > the
> > > function should rather take a QVirtio9P * directly instead of casting
> > > from
> > > a void *.
> > > 
> > > Something like:
> > > 
> > > static uint32_t fs_walk_fid(QVirtio9P *v9p, const char *path)
> > > {
> > > ...
> > > }
> > > 
> > > 
> > > Same remark applies to fs_mkdir() which isn't a top level test function
> > > either BTW (sorry for not having spotted this earlier).
> > 
> > Good point. Typical case of being copy & waste induced. I'll change that.
> 
> Since this also affects other patches in this series and this might
> have a substantial impact, I'll wait for v2 to review if you don't
> mind.

Sure!

There is probably no need to hurry anyway; since these are just test case 
changes, I think it will also be fine if I send the PR during freeze.

You never had any issue with 9p hard links, right? I'm still investigating 
this in parallel. I already can rule out QEMU's sandbox (seccomp) feature, 
even after having disabled the latter that mentioned box is failing any 
link()/linkat() calls. Maybe it's a SELinux issue ...

Best regards,
Christian Schoenebeck