mdmon: preserve socket over chroot

Connect to the monitor in the old namespace and use that connection for
WaitClean requests when stopping the victim mdmon instance.  This allows
ping_monitor() to work post chroot().

Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/msg.c b/msg.c
index 5a4839fa..8d52b948 100644
--- a/msg.c
+++ b/msg.c
@@ -177,10 +177,8 @@ int connect_monitor(char *devname)
 	return sfd;
 }
 
-/* give the monitor a chance to update the metadata */
-int ping_monitor(char *devname)
+int fping_monitor(int sfd)
 {
-	int sfd = connect_monitor(devname);
 	int err = 0;
 
 	if (sfd < 0)
@@ -194,6 +192,16 @@ int ping_monitor(char *devname)
 	if (!err && wait_reply(sfd, 20) != 0)
 		err = -1;
 
+	return err;
+}
+
+
+/* give the monitor a chance to update the metadata */
+int ping_monitor(char *devname)
+{
+	int sfd = connect_monitor(devname);
+	int err = fping_monitor(sfd);
+
 	close(sfd);
 	return err;
 }