[CRIU] [PATCH v2 3/5] mount: save ext_real_root for external mounts

[Andrew Vagin]

On Mon, Mar 20, 2017 at 12:45:42PM +0300, Pavel Tikhomirov wrote:
> need it to check if we can bindmount from external mount
> 
> https://jira.sw.ru/browse/PSBM-46753
> 
> v2: s/real_root/ext_real_root/
> Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
> ---
>  criu/mount.c     | 3 ++-
>  images/mnt.proto | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/criu/mount.c b/criu/mount.c
> index 6e5a4c6..ef5c1ec 100644
> --- a/criu/mount.c
> +++ b/criu/mount.c
> @@ -1335,6 +1335,7 @@ static int dump_one_mountpoint(struct mount_info *pm, struct cr_img *img)
>  		 * for reverse mapping details.
>  		 */
>  		me.root	= pm->external;
> +		me.ext_real_root = pm->root;
>  		me.has_ext_mount = true;
>  		me.ext_mount = true;
>  	} else
> @@ -2445,7 +2446,7 @@ static int get_mp_root(MntEntry *me, struct mount_info *mi)
>  {
>  	char *ext = NULL;
>  
> -	mi->root = xstrdup(me->root);
> +	mi->root = xstrdup(me->ext_real_root ? : me->root);
>  	if (!mi->root)
>  		return -1;
>  
> diff --git a/images/mnt.proto b/images/mnt.proto
> index 50cd8af..3294319 100644
> --- a/images/mnt.proto
> +++ b/images/mnt.proto
> @@ -53,4 +53,5 @@ message mnt_entry {
>  
>  	optional bool		deleted			= 16;
>  	optional uint32		sb_flags		= 17 [(criu).hex = true];
> +	optional string		ext_real_root		= 18;

We need a comment here what this means. What do you think if we add
ext_key instead of ext_real_root, for me it looks more understandable.
>  }
> -- 
> 2.9.3
>