From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:36352) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ssjl3-0001iv-Tr for qemu-devel@nongnu.org; Sat, 21 Jul 2012 20:10:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Ssjl2-0000E4-58 for qemu-devel@nongnu.org; Sat, 21 Jul 2012 20:10:49 -0400 Received: from indium.canonical.com ([91.189.90.7]:56810) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ssjl1-0000E0-UY for qemu-devel@nongnu.org; Sat, 21 Jul 2012 20:10:48 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.71 #1 (Debian)) id 1Ssjl1-0006D8-7h for ; Sun, 22 Jul 2012 00:10:47 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 377782E807F for ; Sun, 22 Jul 2012 00:10:47 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sun, 22 Jul 2012 00:04:49 -0000 From: Kevin Shanahan Sender: bounces@canonical.com References: <20120721234521.2031.53549.malonedeb@chaenomeles.canonical.com> Message-Id: <20120722000450.2756.1385.malone@chaenomeles.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1027525] Re: Unable to insert cd media located on ro nfs mount Reply-To: Bug 1027525 <1027525@bugs.launchpad.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org I ran strace while running the test and I see few times: open("/srv/kvm/iso/ubuntu-12.04-server-amd64.iso", O_RDONLY|O_NONBLOCK) =3D= 12 fstat(12, {st_mode=3DS_IFREG|0666, st_size=3D717533184, ...}) =3D 0 close(12) But the final open looks like this: open("/srv/kvm/iso/ubuntu-12.04-server-amd64.iso", O_RDWR|O_DSYNC|O_CLOEXEC) =3D -1 EROFS (Read-only file system) For some reason, the O_RDRW flag was requested. -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1027525 Title: Unable to insert cd media located on ro nfs mount Status in QEMU: New Bug description: When issuing a "change" command via the monitor, qemu is unable to open the iso file if it is mounted on a read-only nfs share. If I mount read-write (and make sure the file is writable by the qemu process), then the change command succeeds. Note that this doesn't affect media specified on the command line when starting qemu, only when changing via the monitor. To reproduce, mount cd images directory read only, e.g. [root@kvmhost0 ~]# grep iso /etc/fstab 10.48.50.20:/iso /srv/kvm/iso nfs4 defaults,ro 0 0 Start qemu with minimal options, just need access to the monitor: [root@kvmhost0 ~]# kvm -vnc 127.0.0.1:0 -S Connect to the monitor and issue a change command: (qemu) change ide1-cd0 /srv/kvm/iso/ubuntu-12.04-server-amd64.iso Could not open '/srv/kvm/iso/ubuntu-12.04-server-amd64.iso Re-mount the iso directory read-write and notice that the command succeeds: [root@kvmhost0 ~]# mount -o remount,rw /srv/kvm/iso (qemu) change ide1-cd0 /srv/kvm/iso/ubuntu-12.04-server-amd64.iso (qemu) [root@kvmhost0 ~]# kvm --version QEMU emulator version 1.1.1 (qemu-kvm-1.1.1), Copyright (c) 2003-2008 Fab= rice Bellard [root@kvmhost0 ~]# uname -a Linux kvmhost0 3.4.5-1-ARCH #1 SMP PREEMPT Mon Jul 16 21:35:54 CEST 2012 = x86_64 GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1027525/+subscriptions