[PATCH iproute2] netns: make /var/run/netns bind-mount recursive

[Casey Callendrello <casey.callendrello@coreos.com>]

When ip netns {add|delete} is first run, it bind-mounts /var/run/netns
on top of itself, then marks it as shared. However, if there are already
bind-mounts in the directory from other tools, these would not be
propagated. Fix this by recursively bind-mounting.

Signed-off-by: Casey Callendrello <casey.callendrello@coreos.com>
---
 ip/ipnetns.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index 198e9de8..9ee1fe6a 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -636,7 +636,7 @@ static int netns_add(int argc, char **argv)
 		}
 
 		/* Upgrade NETNS_RUN_DIR to a mount point */
-		if (mount(NETNS_RUN_DIR, NETNS_RUN_DIR, "none", MS_BIND, NULL)) {
+		if (mount(NETNS_RUN_DIR, NETNS_RUN_DIR, "none", MS_BIND | MS_REC, NULL)) {
 			fprintf(stderr, "mount --bind %s %s failed: %s\n",
 				NETNS_RUN_DIR, NETNS_RUN_DIR, strerror(errno));
 			return -1;
-- 
2.13.3