From: Greg Freemyer <greg.freemyer@gmail.com>
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended
	file stats available [ver #6]
Date: Mon, 2 Aug 2010 10:09:49 -0400
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Cc: Neil Brown <neilb@suse.de>, David Howells <dhowells@redhat.com>,
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To: Jeff Layton <jlayton@redhat.com>
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> Furthermore, I'll go ahead and propose the following (simple) semantics:
>
> 1) birthtime is initialized to the current time when a new inode is
> created
>
> 2) it's settable via the xattr to an arbitrary value
>
> Either way, the xattr for this ought to be named the same on all
> filesystems. Samba shouldn't need to know or care what the underlying
> filesystem is, as long as it presents the correct xattr.
>
> That should make samba happy, and be reasonably simple to implement.

Is there any reason to allow birthtime to be set in advance of the
current birthtime?

ie restore / copy tools clearly need to backdate it, but I'd prefer to
see it not advance-able.

Greg