netdev - Re: [PATCH v2 02/17] y2038: Remove newstat family from default syscall set

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Date:   Wed, 18 Jul 2018 20:15:06 +0000
From:   Joseph Myers <joseph@...esourcery.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Christoph Hellwig <hch@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        GNU C Library <libc-alpha@...rceware.org>,
        Albert ARIBAUD <albert.aribaud@...ev.fr>,
        Networking <netdev@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: [PATCH v2 02/17] y2038: Remove newstat family from default
 syscall set

On Tue, 17 Jul 2018, Arnd Bergmann wrote:

> That would definitely help. See below for the stat implementation
> I did in my musl libc prototype based on statx(). It passes the
> LTP syscall tests, but that doesn't mean all the corner cases
> are correct.

Well, you definitely need explicit timestamp conversions on the result of 
statx to be usable in struct stat when userspace "long" is 64-bit, for BE 
because otherwise the integer nanoseconds will be in the wrong place for 
struct timespec, and for LE if the "__reserved is held in case we need a 
yet finer resolution." might start being returned as nonzero (for integer 
attoseconds, I suppose) in future.

-- 
Joseph S. Myers
joseph@...esourcery.com