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Re: [Qemu-discuss] No permission to write to a mounted filesystem in a K

From: Alex
Subject: Re: [Qemu-discuss] No permission to write to a mounted filesystem in a KVM guest
Date: Wed, 10 Feb 2016 11:55:03 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

On 10/02/16 11:42, W Forum W wrote:
Anyone can help??

On 02/04/2016 03:47 PM, W Forum W wrote:

I am trying to 'squash' a kvm host filesystem to a kvm guest.

My libvirt xml looks like
<filesystem type='mount' accessmode='squash'>
      <source dir='/data/servers'/>
      <target dir='/servers'/>

I also tried the accessmode passthrough

On the guest I mount the filesystem with
mount -t 9p -o trans=virtio,version=9p2000.L /servers /mnt

When I try to write a file/directory I always get permission denied
but I can read the mounted filesystem normally.

I use qemu-kvm from Debian Stretch
libvirtd --version
libvirtd (libvirt) 1.3.1
kvm --version
QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5), Copyright (c)
2003-2008 Fabrice Bellard
uname -a
Linux 4.3.0-1-amd64 #1 SMP Debian 4.3.3-7 (2016-01-19) x86_64 GNU/Linux
cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux stretch/sid"

Is there something I overlook, or do I need to find another solution
for sharing host filesystem?

Many Thanks!!

Usually squashfs is a read-only filesystem. Not sure how it's supposed to work with libvirt though.

/--Regards, Alex/

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