[libvirt] [PATCH] Unmount existing filesystems under user specified mounts in LXC

[Eric Blake]

On 04/08/2013 10:07 AM, Daniel P. Berrange wrote:
> From: "Daniel P. Berrange" <berrange at redhat.com>
> 
> If the user requests a mount for /run, this may hide any existing
> mounts that are lower down in /run. The result is that the
> container still sees the mounts in /proc/mounts, but cannot
> access them
> 
> sh-4.2# df
> df: '/run/user/501/gvfs': No such file or directory
> df: '/run/media/berrange/LIVE': No such file or directory
> df: '/run/media/berrange/SecureDiskA1': No such file or directory
> df: '/run/libvirt/lxc/sandbox': No such file or directory
> Filesystem                      1K-blocks      Used Available Use% Mounted on
> /dev/mapper/vg_t500wlan-lv_root 151476396 135390200   8384900  95% /
> tmpfs                             1970888      3204   1967684   1% /run
> /dev/sda1                          194241    155940     28061  85% /boot
> devfs                                  64         0        64   0% /dev
> tmpfs                                  64         0        64   0% /sys/fs/cgroup
> tmpfs                             1970888      1200   1969688   1% /etc/libvirt-sandbox/scratch
> 
> Before mounting any filesystem at a particular location, we
> must recursively unmount anything at or below the target mount
> point
> 
> Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
> ---
>  src/lxc/lxc_container.c | 4 ++++
>  1 file changed, 4 insertions(+)

ACK.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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