[CRIU] [RFC] mount: Add ability to c/r devtmpfs

[Cyrill Gorcunov]

On Thu, Oct 16, 2014 at 08:57:40PM +0000, Serge Hallyn wrote:
> Quoting Cyrill Gorcunov (gorcunov at openvz.org):
> > Looking into experiments with OpenVZ kernel
> > it seems plain tar over devtmpfs should be
> > enough for a while. So here is a new option
> > comes in "--devtmpfs-content".
> 
> Hi - so I'm pretty sure this is the case, but just want to make 100%
> sure, and looking at the criu git HEAD didn't help me - when this
> gets restore, it will be mounted as tmpfs right?  (not devtmpfs, I
> hope?)

Hi, Serge! It's mounted as devtmpfs on restore and the option
--devtmpfs-content simply untar devices to newly mounted fs.
Because in vanilla kernel devtmpfs is not virtualized at all
this option is mostly for custom kernels such as openvz (or
any other which implements devtmpfs virtualization). IOW,
it's not a common case but I need it for openvz case.