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Date: Wed, 23 Jul 2008 03:31:41 +1000 (EST)
From: Bruce Evans <brde@optusnet.com.au>
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To: Pedro Giffuni <pfgshield-freebsd@yahoo.com>
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Cc: freebsd-fs@FreeBSD.org
Subject: Re: birthtime initialization
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On Tue, 22 Jul 2008, Pedro Giffuni wrote:

> Tim has some patches I made to add support for birthtime in libarchive (only in extended pax format) as a LIBARCHIVE.creationtime attribute.
>
> Since birthtime is set by modifying mtime twice with utimes(2), the only criteria I used to determine if birthtime should be stored is if it was less than mtime. I hope something can be done to make that behavior consistent with UFS2 in all other filesystems.

Can't it check for st_birthtime.tv_sec being != 0 or -1?  The erroneous
default of 0 might interact badly with file systems written by buggy
versions of tar that set times to 0.

Bruce