linux-kernel - Re: [RFC 11/32] xfs: convert to struct inode

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Message-ID: <5389252A.5050503@zytor.com>
Date:	Fri, 30 May 2014 17:41:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Chinner <david@...morbit.com>, Arnd Bergmann <arnd@...db.de>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	joseph@...esourcery.com, john.stultz@...aro.org, hch@...radead.org,
	tglx@...utronix.de, geert@...ux-m68k.org, lftan@...era.com,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com
Subject: Re: [RFC 11/32] xfs: convert to struct inode_time

On 05/30/2014 05:37 PM, Dave Chinner wrote:
> 
> IOWs, the filesystem has to be able to reject any attempt to set a
> timestamp that is can't represent on disk otherwise Bad Stuff will
> happen,

Actually it is questionable if it is worse to reject a timestamp or just
let it wrap.  Rejecting a valid timestamp is a bit like "You don't
exist, go away."

> and filesystems have to be able to specify in their on
> disk format what timestamp encoding is being used. The solution will
> be different for every filesystem that needs to support time beyond
> 2038.

Actually the cutoff can be really different for each filesystem, not
necessarily 2038.  However, I maintain the above still holds.

Consider a filesystem that kept timestamps in YYMMDDHHMMSS format.  What
would you have expected such a filesystem to do on Jan 1, 2000?

	-hpa


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