Re: [libvirt] [PATCH] Allow use of block devices for guest filesystem

From: "Daniel P. Berrange&quot;&lt;berrange(a)redhat.com&gt; Currently the LXC driver can only populate filesystems from host filesystems, using bind mounts. This patch allows host block devices to be mounted. It autodetects the filesystem format at mount time, and adds the block device to the cgroups ACL. Example usage is <filesystem type='block' accessmode='passthrough'> <source dev='/dev/sda1'/> <target dir='/home'/> </filesystem> * src/lxc/lxc_container.c: Mount block device filesystems * src/lxc/lxc_controller.c: Add block device filesystems to cgroups ACL --- src/lxc/lxc_container.c | 179 +++++++++++++++++++++++++++++++++++++++++++++- src/lxc/lxc_controller.c | 17 +++++ 2 files changed, 195 insertions(+), 1 deletions(-)

+ +/* + * This functions attempts todo automatic detection of filesystem

+ * type following the same rules as the util-linux 'mount' binary. + * + * The main difference is that we don't (currently) try to use + * libblkid to detect the format first. We go straight to using + * /etc/filesystems, and then /proc/filesystems + */ +static int lxcContainerMountFSBlockAuto(virDomainFSDefPtr fs, + int flags, + const char *src, + const char *srcprefix) +{

- ret = 0; + /* We've got to the end of /etc/filesystems and saw + * a '*', so we mhust try /proc/filesystems next