Re: [PATCH 02/18] xstat: Add a pair of system calls to makeextended file stats available [ver #6]

From: Jeremy Allison
Date: Thu Aug 05 2010 - 19:52:38 EST

On Sun, Aug 01, 2010 at 09:25:29AM -0400, Jeff Layton wrote:
> On Fri, 30 Jul 2010 23:22:58 +0200
> utz lehmann <lkml123@xxxxxxxxxx> wrote:
> > On Thu, 2010-07-22 at 09:40 -0700, Linus Torvalds wrote:
> > > But the fact is, th Unix ctime semantics are insane and largely
> > > useless. There's a damn good reason almost nobody uses ctime under
> > > unix.
> > >
> > > So what I'm suggesting is that we have a flag - either per-process or
> > > per-mount - that just says "use windows semantics for ctime".
> >
> > When abusing an existing time stamp use atime not ctime please.
> > ctime has it's uses. atime was just a mistake and is nearly useless.
> >
> > And with noatime we already have creation time semantics for atime.
> >
> Ugh. Honestly all of this talk of abusing different time fields seems
> like craziness to me. It's going to be very hard to do that without
> breaking *something*. There's also very little reason to do this when
> xattrs are a much cleaner approach.
> Neil Brown has put forth a very reasoned justification for putting the
> birthtime in an xattr. After reading it, I think that makes more sense
> than anything. It's also something that can be done without any extra
> infrastructure. If at some point in the future we get an xstat-like
> syscall then we can always add birthtime to that as well.

Just my 2 cents (as a Samba server implementor). I *hate* the idea
of adding a "virtual" EA for birthtime. If you're going to add it,
just add it to the stat struct like *BSD does. Don't abuse the other
time fields, it's a new one.

Jeff, please don't advocate for an EA for the Samba server to use.
Don't add it as an EA. It's *not* an EA, it's a timestamp.

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