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Date:   Thu, 25 Feb 2021 14:21:25 -0500
From:   Bruce Fields <bfields@fieldses.org>
To:     Tom Talpey <tom@talpey.com>
Cc:     Olga Kornievskaia <aglo@umich.edu>,
        Chuck Lever <chuck.lever@oracle.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
        Olga Kornievskaia <kolga@netapp.com>
Subject: Re: [PATCH] nfsd: don't abort copies early
Message-ID: <20210225192125.GF17634@fieldses.org>
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On Thu, Feb 25, 2021 at 01:39:34PM -0500, Tom Talpey wrote:
> On 2/25/2021 10:57 AM, Bruce Fields wrote:
> >Yes, that was part of some Y2038 project on Arnd Bergman's part:
> >
> >	20b7d86f29d3 nfsd: use boottime for lease expiry calculation
> >
> >I think 64-bit time_t is good for something like a hundred billion
> >years, so wraparound isn't an issue.
> 
> Well, the universe is somewhere below 14B so that's good, but is this
> time guaranteed to be monotonic? If someone sets the system time, many
> clocks can go backward...

Yeah, Arnd makes a note about this in the above commit.

--b.