From eugen@grosbein.net Sat Dec 11 16:20:33 2021
X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
	by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 3ECC718D33E6
	for <freebsd-hackers@mlmmj.nyi.freebsd.org>; Sat, 11 Dec 2021 16:21:12 +0000 (UTC)
	(envelope-from eugen@grosbein.net)
Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified))
	by mx1.freebsd.org (Postfix) with ESMTPS id 4JBCgr04dWz4RW6;
	Sat, 11 Dec 2021 16:21:11 +0000 (UTC)
	(envelope-from eugen@grosbein.net)
Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged))
	by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id 1BBGKkml067079
	(version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
	Sat, 11 Dec 2021 16:20:47 GMT
	(envelope-from eugen@grosbein.net)
X-Envelope-From: eugen@grosbein.net
X-Envelope-To: arrowd@freebsd.org
Received: from [10.58.0.10] (dadvw [10.58.0.10])
	by eg.sd.rdtc.ru (8.16.1/8.16.1) with ESMTPS id 1BBGKjDZ040335
	(version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT);
	Sat, 11 Dec 2021 23:20:45 +0700 (+07)
	(envelope-from eugen@grosbein.net)
Subject: Re: What to use in place of abstract unix sockets?
To: Gleb Popov <arrowd@freebsd.org>, "Daniel O'Connor" <darius@dons.net.au>
References: <CALH631kYAz+_=p6VUhxzx0tz8eox804PCK5A9POxQkZTdThZCQ@mail.gmail.com>
 <F0BE714E-E25B-4A49-AA6E-B0E906374446@dons.net.au>
 <CALH631m8P_NG3nTZ1JQ2hhZMTrAMuuGjS8Ahz_qDMu1bFDCzkw@mail.gmail.com>
 <58874E76-8541-46BF-A197-C984D6A869DF@dons.net.au>
 <CALH631nVvp2Ra4RYzEpPkQ-bi_sgqiQ5_XxrP35mTx=8R7dODg@mail.gmail.com>
Cc: freebsd-hackers <freebsd-hackers@freebsd.org>
From: Eugene Grosbein <eugen@grosbein.net>
Message-ID: <f6cc691e-c709-8c9c-1325-aee14f09ebc1@grosbein.net>
Date: Sat, 11 Dec 2021 23:20:33 +0700
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101
 Thunderbird/45.8.0
List-Id: Technical discussions relating to FreeBSD <freebsd-hackers.freebsd.org>
List-Archive: https://lists.freebsd.org/archives/freebsd-hackers
List-Help: <mailto:freebsd-hackers+help@freebsd.org>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Subscribe: <mailto:freebsd-hackers+subscribe@freebsd.org>
List-Unsubscribe: <mailto:freebsd-hackers+unsubscribe@freebsd.org>
Sender: owner-freebsd-hackers@freebsd.org
MIME-Version: 1.0
In-Reply-To: <CALH631nVvp2Ra4RYzEpPkQ-bi_sgqiQ5_XxrP35mTx=8R7dODg@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT
	autolearn=disabled version=3.4.2
X-Spam-Report: 
	* -0.0 SHORTCIRCUIT No description available.
	* -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net
X-Rspamd-Queue-Id: 4JBCgr04dWz4RW6
X-Spamd-Bar: ----
Authentication-Results: mx1.freebsd.org;
	none
X-Spamd-Result: default: False [-4.00 / 15.00];
	 REPLY(-4.00)[]
X-Spam: Yes
X-ThisMailContainsUnwantedMimeParts: N

11.12.2021 16:59, Gleb Popov wrote:

> EXDEV: Cross-device link
> 
> This might be because the chroot's target directory is an nullfs mount. Am
> I right that it isn't possible to create hard links that span nullfs mount
> points?

It is not possible to create hard links for source and destination directories
with different st_dev values as per stat(2), this includes nullfs,
each of which has its own st_dev id.