From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:8407 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752643Ab3KNXnz (ORCPT ); Thu, 14 Nov 2013 18:43:55 -0500 Date: Fri, 15 Nov 2013 00:43:51 +0100 From: Karel Zak To: Zbigniew =?utf-8?Q?J=C4=99drzejewski-Szmek?= Cc: linux-btrfs@vger.kernel.org, systemd-devel@lists.freedesktop.org Subject: Re: [systemd-devel] is mounting subvolumes with a read-only root subvolume allowed? Message-ID: <20131114234351.GI13330@x2.net.home> References: <20131114233210.GU30929@in.waw.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 In-Reply-To: <20131114233210.GU30929@in.waw.pl> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Fri, Nov 15, 2013 at 12:32:10AM +0100, Zbigniew Jędrzejewski-Szmek wrote: > Hi, > I have a box with / and /home being subvolumes from the same btrfs filesystem. > > /etc/fstab: > UUID=c0686... / btrfs subvol=root,x-systemd.device-timeout=0 1 1 > UUID=c0686... /home btrfs subvol=home,x-systemd.device-timeout=0 1 1 > ... > > / is initially mounted readonly by the initramfs, and then after switching > to the real system, /home is attempted to be mounted in parallel with / > being remounted rw. If remounting rw happens first, boot proceeds. If > mounting /home is attempted to realy, it fails. > > $ /bin/mount /home > mount: /dev/mapper/luks-765... is already mounted or /home busy > /dev/mapper/luks-765... is already mounted on / > $ /bin/mount -o remount,rw / > $ /bin/mount /home > $ > > So, is this expected that the other subvolume must be mounted rw? This is known and pretty stupid issue: http://www.spinics.net/lists/linux-btrfs/msg25502.html ... but it seems that btrfs guys are fine with this "feature". Karel -- Karel Zak http://karelzak.blogspot.com