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Date: Thu, 14 Jan 2016 23:54:36 +0100 From: Arnd Bergmann <arnd@...db.de> To: y2038@...ts.linaro.org Cc: Dave Chinner <david@...morbit.com>, linux-fsdevel@...r.kernel.org, Deepa Dinamani <deepa.kernel@...il.com>, linux-kernel@...r.kernel.org Subject: Re: [Y2038] [RFC 02/15] vfs: Change all structures to support 64 bit time On Thursday 14 January 2016 23:46:16 Arnd Bergmann wrote: > > I'm not following the line of thought here. We have some users > that want ext4 to mount old file system images without long > inodes writable, because they don't care about the 2038 problem. > We also have other users that want to force the same file system > image to be read-only because they want to ensure that it does > not stop working correctly when the time overflow happens while > the fs is mounted. > > If you don't want a compile-time option for it, how do you suggest > we decide which case we have? In case that came across wrong, I'm assuming that the first user also wants all the system calls enabled that pass 32-bit time_t values, while the second one wants them all left out from the kernel to ensure that no user space program gets incorrect data. This could be done using a sysctl of course, but I still think we want a compile-time option for the syscalls for clarity, and I would simply use the same compile-time option to determine the behavior of the file system, network protocols and device drivers that deal with 32-bit timestamps outside of the kernel. Arnd
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