From owner-freebsd-stable@FreeBSD.ORG  Sun Dec 26 07:48:33 2010
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Date: Sun, 26 Dec 2010 15:31:56 +0800
From: Denny Lin <dennylin93@hs.ntnu.edu.tw>
To: Daniel Braniss <danny@cs.huji.ac.il>
Message-ID: <20101226073156.GA84868@mail.hs.ntnu.edu.tw>
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Cc: freebsd-stable@freebsd.org
Subject: Re: unable to pwd in ZFS snapshot
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On Sun, Dec 26, 2010 at 09:26:13AM +0200, Daniel Braniss wrote:
> this is still broken in 8.2-PRERELEASE, there seems to be a patch, but
> it's almost a year old.
> 	http://people.freebsd.org/~jh/patches/zfs-ctldir-vptocnp.diff

Setting snapdir to visible should fix this right away:
# zfs set snapdir=visible tank/foo

-- 
Denny Lin