From owner-freebsd-fs@freebsd.org Thu Nov 21 16:30:37 2019 Return-Path: Delivered-To: freebsd-fs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 6F8C51C43C3 for ; Thu, 21 Nov 2019 16:30:37 +0000 (UTC) (envelope-from martin@lispworks.com) Received: from lwfs1-cam.cam.lispworks.com (mail.lispworks.com [46.17.166.21]) by mx1.freebsd.org (Postfix) with ESMTP id 47JlRJ0jp8z4cmY for ; Thu, 21 Nov 2019 16:30:35 +0000 (UTC) (envelope-from martin@lispworks.com) Received: from higson.cam.lispworks.com (higson.cam.lispworks.com [192.168.1.7]) by lwfs1-cam.cam.lispworks.com (8.15.2/8.15.2) with ESMTP id xALGUUFL037698; Thu, 21 Nov 2019 16:30:30 GMT (envelope-from martin@lispworks.com) Received: from higson.cam.lispworks.com (localhost.localdomain [127.0.0.1]) by higson.cam.lispworks.com (8.14.4) id xALGUTjo010709; Thu, 21 Nov 2019 16:30:29 GMT Received: (from martin@localhost) by higson.cam.lispworks.com (8.14.4/8.14.4/Submit) id xALGUT5Z010705; Thu, 21 Nov 2019 16:30:29 GMT Date: Thu, 21 Nov 2019 16:30:29 GMT Message-Id: <201911211630.xALGUT5Z010705@higson.cam.lispworks.com> From: Martin Simmons To: Borja Marcos CC: jbe-mlist@magnetkern.de, freebsd-fs@freebsd.org In-reply-to: <462E2C53-2490-4B8C-BB54-BCE8B75BAEB0@sarenet.es> (message from Borja Marcos on Thu, 21 Nov 2019 14:46:04 +0100) Subject: Re: ZFS snapdir readability (Crosspost) References: <20191107004635.c6d2e7d464d3d556a0d87465@magnetkern.de> <9B22AD46-BE87-4305-9638-74D23AD4C8CA@sarenet.es> <261FE331-EC5C-48C8-9249-9BCBF887CE38@sarenet.es> <913f7040-6e38-452d-6187-e17fae63b652@sentex.net> <20191120144041.7f916360dc0c69bf509c9bd1@magnetkern.de> <20191120163437.691abd369ab9c0a6d7d45ff2@magnetkern.de> <20191120175803.03401c3316fe756cc46f79f1@magnetkern.de> <3C5DC6DD-C44B-41EE-B7AB-6D8F94E43174@sarenet.es> <201911211259.xALCxShX008743@higson.cam.lispworks.com> <462E2C53-2490-4B8C-BB54-BCE8B75BAEB0@sarenet.es> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 47JlRJ0jp8z4cmY X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of martin@lispworks.com has no SPF policy when checking 46.17.166.21) smtp.mailfrom=martin@lispworks.com X-Spamd-Result: default: False [-0.24 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.39)[-0.391,0]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[lispworks.com]; AUTH_NA(1.00)[]; NEURAL_HAM_LONG(-0.84)[-0.838,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[21.166.17.46.list.dnswl.org : 127.0.10.0]; R_SPF_NA(0.00)[]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:51055, ipnet:46.17.166.0/24, country:GB]; IP_SCORE(-0.02)[country: GB(-0.08)] X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Nov 2019 16:30:37 -0000 >>>>> On Thu, 21 Nov 2019 14:46:04 +0100, Borja Marcos said: > > > On 21 Nov 2019, at 13:59, Martin Simmons wrote: > > > >>>>>> On Thu, 21 Nov 2019 13:12:04 +0100, Borja Marcos said: > >> > >> What I mean is, there is no snapshot mount functionality. If you want to access the > >> contents of a snapshot you either rollback it or you clone it. There is no > >> mount. > > > > I think that is incorrect. You can mount a snapshot on /mnt like this: > > > > /sbin/mount -t zfs filesystem@snapname /mnt > > I’ve never seen that and, indeed, on FreeBSD 12.1 it’s not possible. Or I am terribly > sloppy today! > > Did I miss anything? Is it a new ZFS on Linux feature? > > > root@micro1:~ # mount -t zfs -o ro pool/dataset@snapshot /mnt > mount: unpul/wwwnfsen@antesinst: Device busy > root@micro1:~ # It looks like unpul/wwwnfsen@antesinst is already mounted -- probably in .zfs :-) __Martin