linux-kernel - Re: [PATCH xfstests v2 2/2] open_by_handle: add tests for u64 mount ID

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Message-ID: <20240904.162424-novel.fangs.vital.nursery-BQvjXGlIi7vb@cyphar.com>
Date: Thu, 5 Sep 2024 02:30:52 +1000
From: Aleksa Sarai <cyphar@...har.com>
To: Amir Goldstein <amir73il@...il.com>
Cc: fstests@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, Chuck Lever <chuck.lever@...cle.com>, 
	Jeff Layton <jlayton@...nel.org>, Alexander Aring <alex.aring@...il.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, 
	Adrian Hunter <adrian.hunter@...el.com>, "Liang, Kan" <kan.liang@...ux.intel.com>, 
	Christoph Hellwig <hch@...radead.org>, Josef Bacik <josef@...icpanda.com>, 
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-api@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH xfstests v2 2/2] open_by_handle: add tests for u64 mount
 ID

On 2024-09-03, Amir Goldstein <amir73il@...il.com> wrote:
> On Tue, Sep 3, 2024 at 8:41 AM Aleksa Sarai <cyphar@...har.com> wrote:
> >
> > On 2024-09-02, Amir Goldstein <amir73il@...il.com> wrote:
> > > On Mon, Sep 2, 2024 at 6:46 PM Aleksa Sarai <cyphar@...har.com> wrote:
> > > >
> > > > Now that open_by_handle_at(2) can return u64 mount IDs, do some tests to
> > > > make sure they match properly as part of the regular open_by_handle
> > > > tests.
> > > >
> > > > Link: https://lore.kernel.org/all/20240828-exportfs-u64-mount-id-v3-0-10c2c4c16708@cyphar.com/
> > > > Signed-off-by: Aleksa Sarai <cyphar@...har.com>
> > > > ---
> > > > v2:
> > > > - Remove -M argument and always do the mount ID tests. [Amir Goldstein]
> > > > - Do not error out if the kernel doesn't support STATX_MNT_ID_UNIQUE
> > > >   or AT_HANDLE_MNT_ID_UNIQUE. [Amir Goldstein]
> > > > - v1: <https://lore.kernel.org/all/20240828103706.2393267-1-cyphar@cyphar.com/>
> > >
> > > Looks good.
> > >
> > > You may add:
> > >
> > > Reviewed-by: Amir Goldstein <amir73il@...il.com>
> > >
> > > It'd be nice to get a verification that this is indeed tested on the latest
> > > upstream and does not regress the tests that run the open_by_handle program.
> >
> > I've tested that the fallback works on mainline and correctly does the
> > test on patched kernels (by running open_by_handle directly) but I
> > haven't run the suite yet (still getting my mkosi testing setup working
> > to run fstests...).
> 
> I am afraid this has to be tested.
> I started testing myself and found that it breaks existing tests.
> Even if you make the test completely opt-in as in v1 it need to be
> tested and _notrun on old kernels.
> 
> If you have a new version, I can test it until you get your fstests setup
> ready, because anyway I would want to check that your test also
> works with overlayfs which has some specialized exportfs tests.
> Test by running ./check -overlay -g exportfs, but I can also do that for you.

I managed to get fstests running, sorry about that...

For the v3 I have ready (which includes a new test using -M), the
following runs work in my VM:

 - ./check -g exportfs
 - ./check -overlay -g exportfs

Should I check anything else before sending it?

Also, when running the tests I think I may have found a bug? Using
overlayfs+xfs leads to the following error when doing ./check -overlay
if the scratch device is XFS:

  ./common/rc: line 299: _xfs_has_feature: command not found
    not run: upper fs needs to support d_type

The fix I applied was simply:

diff --git a/common/rc b/common/rc
index 0beaf2ff1126..e6af1b16918f 100644
--- a/common/rc
+++ b/common/rc
@@ -296,6 +296,7 @@ _supports_filetype()
 	local fstyp=`$DF_PROG $dir | tail -1 | $AWK_PROG '{print $2}'`
 	case "$fstyp" in
 	xfs)
+		. common/xfs
 		_xfs_has_feature $dir ftype
 		;;
 	ext2|ext3|ext4)

Should I include this patch as well, or did I make a mistake somewhere?
(I could add the import to the top instead if you'd prefer that.)

Thanks.

> 
> Thanks,
> Amir.

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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