[Devel] [PATCH rh7] net: Don't nillify ve::ve_netns of ve0 on net exit

[Cyrill Gorcunov]

When net-exit routine executes we zap ve::ve_netns member
but we should not nillify ve0::init_net, it's permanent one.

https://jira.sw.ru/browse/PSBM-33480

p.s.: When net unsharing happens on ve0 we do set net->owner_ve
to ve0, thus on exit we occasionally rip it off causing any
futher attempts to call unshare on ve0 to fail.

Signed-off-by: Cyrill Gorcunov <gorcunov at odin.com>
CC: Andrew Vagin <avagin at odin.com>
---
 net/core/net_namespace.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: linux-pcs7.git/net/core/net_namespace.c
===================================================================
--- linux-pcs7.git.orig/net/core/net_namespace.c
+++ linux-pcs7.git/net/core/net_namespace.c
@@ -314,7 +314,11 @@ static void cleanup_net(struct work_stru
 		ops_free_list(ops, &net_exit_list);
 
 	list_for_each_entry(net, &net_kill_list, cleanup_list) {
-		net->owner_ve->ve_netns = NULL;
+		/*
+		 * Don't ever nil'ify init_net!
+		 */
+		if (net->owner_ve->ve_netns != get_ve0()->ve_netns)
+			net->owner_ve->ve_netns = NULL;
 		put_ve(net->owner_ve);
 	}