From: David van Moolenbroek <david@minix3.org>
Date: Thu, 16 Jul 2015 15:12:03 +0000 (+0200)
Subject: RS: reset heartbeat status after rollback
X-Git-Url: http://zhaoyanbai.com/repos/named.html?a=commitdiff_plain;h=refs%2Fchanges%2F01%2F3101%2F2;p=minix.git

RS: reset heartbeat status after rollback

While in a multicomponent live update that includes RS, the new RS
instance may receive heartbeat replies which, after a rollback, the
old RS instance will then never see.  As a result, the rolled-back
RS instance may end up killing well-behaving services.

Change-Id: I0f0af283c33502d5d55b27e353b62aec2e301285
---

diff --git a/minix/servers/rs/update.c b/minix/servers/rs/update.c
index b964936e0..49e45f8ee 100644
--- a/minix/servers/rs/update.c
+++ b/minix/servers/rs/update.c
@@ -296,6 +296,7 @@ int sys_upd_flags;
 void rollback_service(struct rproc **new_rpp, struct rproc **old_rpp)
 {
   /* Rollback an updated service. */
+  struct rproc *rp;
   int r = OK;
 
   /* RS is special, we may only need to swap the slots to rollback. */
@@ -311,6 +312,10 @@ void rollback_service(struct rproc **new_rpp, struct rproc **old_rpp)
           if(rs_verbose)
               printf("RS: %s performed rollback\n", srv_to_string(*new_rpp));
       }
+      /* Since we may now have missed heartbeat replies, resend requests. */
+      for (rp = BEG_RPROC_ADDR; rp < END_RPROC_ADDR; rp++)
+          if (rp->r_flags & RS_ACTIVE)
+              rp->r_check_tm = 0;
   }
   else {
       int swap_flag = ((*new_rpp)->r_flags & RS_INIT_PENDING ? RS_DONTSWAP : RS_SWAP);