From owner-freebsd-fs@freebsd.org  Sat Aug 26 07:34:16 2017
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From: Heikki Lindholm <holin@iki.fi>
Subject: zfs birthtimes cannot be set
To: freebsd-fs@freebsd.org
Message-ID: <5d975b32-cdec-1a8c-3a6a-c569c8c125a1@iki.fi>
Date: Sat, 26 Aug 2017 10:27:12 +0300
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Hello list,

man utimes says:
"The access time is set to the value of the first element, and the 
modification time is set to the value of the second element. For file 
systems that support file birth (creation) times (such as UFS2), the 
birth time will be set to the value of the second element if the second 
  element is older than the currently set birth time."

On FreeBSD (11.0), I can't set birthtime / crtime on ZFS although files 
appear to have it. Is it supposed to work? If not, is there a WONTFIX on 
this one for some particular reason? On Solaris, crtimes can be set via 
system xattr calls.

Please, cc me as I'm not subscribed to the list.

Regards,
Heikki Lindholm