linux-kernel - Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

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Date:	Mon, 2 Aug 2010 10:09:49 -0400
From:	Greg Freemyer <greg.freemyer@...il.com>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	Neil Brown <neilb@...e.de>, David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Jeremy Allison <jra@...ba.org>, Volker.Lendecke@...net.de,
	linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended 
	file stats available [ver #6]

> 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
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