[CRIU] [PATCH] restore: Wait for userns being prepared before moving into cgroups (v2)

[Pavel Emelyanov]

On 04/21/2016 01:50 AM, 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.

The commit message doesn't match the patch itself.

> @@ -213,7 +213,8 @@ static inline unsigned long restorer_stack(struct thread_restore_args *a)
>  
>  enum {
>  	CR_STATE_FAIL		= -1,
> -	CR_STATE_RESTORE_NS	= 0, /* is used for executing "setup-namespace" scripts */
> +	CR_STATE_RESTORE_USERNS = 0,	/* restore uid_map and gid_map */
> +	CR_STATE_RESTORE_NS,		/* is used for executing "setup-namespace" scripts */

Why not merge it with CR_STATE_RESTORE_NS?

>  	CR_STATE_RESTORE_SHARED,
>  	CR_STATE_FORKING,
>  	CR_STATE_RESTORE,
>