Re: [LTP] [PATCH v7 3/3] syscalls/copy_file_range02: increase coverage and remove EXDEV test

[Petr Vorel <pvorel@suse.cz>]

Hi Murphy,

> On Thu, Aug 08, 2019 at 11:11:43AM +0800, Yang Xu wrote:
> > on 2019/08/07 18:17, Murphy Zhou wrote:

> > > And I have a question about LTP itself.

> > > If we run the testcase directly like:
> > > 	 ./testcases/kernel/syscalls/copy_file_range/copy_file_range02

> > > to test all_filesystems, for every filesystem, we mkfs and mount it in
> > > .mntpoint, but we do not chdir to .mntpoint. So we are running tests in 
> > > the same tmpdir, fs type of which does not change while looping
> > > all_filesystems.  Only the .mntpoint in tmpdir has different fs type in
> > > each loop.

> > > Now we are using this to test cross-device copy in copy_file_range01.c,
> > > but in copy_file_range02.c, we are not using .mntpint at all, all the
> > > tests in the all_filesystems loop are running in the same tmpdir. In other
> > > words, we are NOT testing all filesystems.

> > > Is this expected?
> >  I removed the mnted test for cross-device copy_file_range in copy_file_range02.c.
> > And I ignore the non-used mntpoint. IMO, we can directly use the FILE_MNTED to test EFBIG on all filesystems, 

> If mntpoint is not used, it makes absolutely NO sense to test all_filesystems.
Thanks for pointing this out. I was blind when reviewing this patchset.
At least this has been fixed.

> Because in the all_filesystems loop, various supported filesystems are
> created and mounted in mntpoint.

> And the copy_file_range tests happens outside of mntpoint. It just repeats
> the same test several times in the same tmpdir, fs type of which depends
> on /tmp configuration.

> When the log prints "testing ext2", it's not the truth.

> EFBIG is another issue.
Yep, we still need to think about different errnos, which depend on LTP policy
being defined [1].

> Thanks,
> Murphy

Kind regards,
Petr

[1] https://patchwork.ozlabs.org/patch/1143438/