linux-kernel - Re: [PATCH 2/3] xfs: disallow broken ioctls without compat-32-bit-time

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Date:   Tue, 7 Jan 2020 06:16:34 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Christoph Hellwig <hch@...radead.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Brian Foster <bfoster@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Allison Collins <allison.henderson@...cle.com>,
        Jan Kara <jack@...e.cz>, Eric Sandeen <sandeen@...deen.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] xfs: disallow broken ioctls without
 compat-32-bit-time

On Thu, Jan 02, 2020 at 10:07:49AM -0800, Darrick J. Wong wrote:
> > Sorry I missed that comment earlier. I've had a fresh look now, but
> > I think we still need to deprecate XFS_IOC_SWAPEXT and add a
> > v5 version of it, since the comparison will fail as soon as the range
> > of the inode timestamps is extended beyond 2038, otherwise the
> > comparison will always be false, or require comparing the truncated
> > time values which would add yet another representation.
> 
> I prefer we replace the old SWAPEXT with a new version to get rid of
> struct xfs_bstat.  Though a SWAPEXT_V5 probably only needs to contain
> the *stat fields that swapext actually needs to check that the file
> hasn't been changed, which would be ino/gen/btime/ctime.
> 
> (Maybe I'd add an offset/length too...)

And most importantly we need to lift it to the VFS instead of all the
crazy fs specific interfaces at the moment.