linux-kernel - Re: Nanosecond fs timestamp support: sad

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Message-ID: <20110722234921.GE10749@fieldses.org>
Date:	Fri, 22 Jul 2011 19:49:21 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Andi Kleen <andi@...stfloor.org>, Matt Mackall <mpm@...enic.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Nanosecond fs timestamp support: sad

On Fri, Jul 22, 2011 at 07:06:12PM -0400, J. Bruce Fields wrote:
> On Sat, Jul 23, 2011 at 08:59:15AM +1000, NeilBrown wrote:
> > But does anyone apart from NFSv4 actually *want* i_version as opposed to the
> > more-generally-useful precise timestamps?
> 
> It *seems* like a generally useful idea, but I don't know of any other
> users.

(Out of curiosity: what actually *needs* real timestamps?:
	- They're generally useful to people, of course; ("what did I
	  change last tuesday?")
	- Make uses them, though in theory perhaps it could do the same
	  job by caching records like "object X was built from
	  versions a, b, and c of objects A, B, and C respectively".

But a lot of uses are probably just to answer the question "did this
file change since the last time I looked at it"?

Of course, however theoretically useful, there's always the argument
that linux-specific interfaces are unlikely to be used by anyone except
Lennart Poettering.)

--b.
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