[CRIU] [PATCH] restore: Wait for userns being prepared before moving into cgroups

[Cyrill Gorcunov]

On Wed, Apr 20, 2016 at 11:46:54PM +0300, Andrey Vagin wrote:
> From: Andrew Vagin <avagin at virtuozzo.com>
> 
> When user namespace are stepping in we should wait for their preparation
> to complete before start using userns daemon (internally the kernel
> checks for uids and if uids are not set -EINVAL will be returned
> when usersn calls for sendmsg()).
> 
> Thus use completion and wait for uid maps being written first.
> 
> https://jira.sw.ru/browse/PSBM-46360
> 
> Cc: Cyrill Gorcunov <gorcunov at gmail.com>
> Signed-off-by: Andrew Vagin <avagin at virtuozzo.com>
Acked-by: Cyrill Gorcunov <gorcunov at openvz.org>

Great! This version is shorter. Gonna pick it up into stable. Thanks!