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From: Deepa Dinamani <deepa.kernel@gmail.com>
To: Amir Goldstein <amir73il@gmail.com>
Cc: fstests <fstests@vger.kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	y2038 Mailman List <y2038@lists.linaro.org>,
	Sasha Levin <sashal@kernel.org>,
	Greg KH <gregkh@linuxfoundation.org>
Subject: Re: [PATCH] generic/402: fix for updated behavior of timestamp limits
Date: Thu, 12 Dec 2019 13:55:15 -0800	[thread overview]
Message-ID: <CABeXuvoHw8W02JsmZjafnQkOs1=0dodSpBFyJ_Gq+1vs+hFkQQ@mail.gmail.com> (raw)
In-Reply-To: <CAOQ4uxhxVKhUh_P_NffLbGScpiL0wOrCTLwWJWeSbRRNbHzPrg@mail.gmail.com>

> >  {
> >         local device=${1:-$TEST_DEV}
> > -       local sysfsdir=/proc/sys/fs/fs-timestamp-check-on
> > -
> > -       if [ ! -e $sysfsdir ]; then
> > -               _notrun "no kernel support for y2038 sysfs switch"
> > -       fi
> >
>
> Deepa,
>
> This change, which is already merged removed the test for kernel support
> and replaced it with test only for filesystem support.
>
> This impacts people validating stable kernel releases with xfstest, because
> this test now always fails on stable kernels and I don't think that timestamp
> clamping behavior is going to stable kernels.
>
> Of course stable kernel testers can exclude this test, but this will remove test
> coverage and may result in silent breakage of > y2038 timetamps in stable
> kernels.
>
> I think test should identify if kernel had clamping behavior and change the
> expected timestamp values accordingly, similar to how the test was before
> adjusting it to new behavior.
>
> Do you agree? Can you make these changes?

Initially, we were going to allow rw mounts for filesystems which
could not update timestamps. And, this was a big change in behavior.
That is why we had the behavior exposed from the kernel.
I wasn't aware that the failing fstests would cause such a nuisence.
Since everybody seems to just rely on all the fstests passing, yes I
agree that bringing this back would be the easiest to not fail on
stable kernels.
I will post the kernel and the xfstest patch.

Thanks for helping me catch it.

-Deepa

  reply	other threads:[~2019-12-12 21:55 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-19  4:12 [PATCH] generic/402: fix for updated behavior of timestamp limits Deepa Dinamani
2019-07-21 16:47 ` Eryu Guan
2019-10-02 22:06   ` Deepa Dinamani
2019-10-05 18:35 ` Eryu Guan
2019-10-23 22:17   ` Deepa Dinamani
2019-12-12 13:11 ` Amir Goldstein
2019-12-12 21:55   ` Deepa Dinamani [this message]
2019-12-18 20:21     ` Deepa Dinamani
2019-12-18 20:46       ` Amir Goldstein
2019-12-19  8:28         ` [Y2038] " Arnd Bergmann
2019-12-19  8:40           ` Greg KH
2019-12-19 11:29             ` Arnd Bergmann
2019-12-19 11:35               ` Greg KH
2019-12-19 15:48               ` Ben Hutchings
2019-12-19 20:35                 ` Arnd Bergmann
2019-12-19 12:09           ` Amir Goldstein
2019-12-20 22:45             ` Deepa Dinamani
2019-12-23  5:16               ` [PATCH] generic/402: Make timestamp range check conditional Deepa Dinamani
2019-12-23  6:36                 ` Amir Goldstein
2019-12-24  1:15                   ` Deepa Dinamani
2019-12-28 22:13                     ` [PATCH v2] " Deepa Dinamani
2019-12-30  7:34                       ` Amir Goldstein
2020-01-03  6:46                         ` Deepa Dinamani
2020-01-03  9:58                           ` Amir Goldstein
2020-01-08  8:09                         ` Eryu Guan
2020-01-08  8:45                           ` Amir Goldstein
2020-01-08  9:50                             ` Eryu Guan
2020-01-17  9:09                               ` Amir Goldstein
2020-01-17 18:23                                 ` Deepa Dinamani
2020-01-17 19:01                                   ` Deepa Dinamani
2020-01-19  0:57                                     ` [PATCH v3 1/1] " Deepa Dinamani
2020-01-19  9:19                                       ` Amir Goldstein
2020-02-01  9:14                                         ` Eryu Guan

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