svn commit: r220865 - head/sbin/hastd

[Pawel Jakub Dawidek]

Author: pjd
Date: Tue Apr 19 19:26:27 2011
New Revision: 220865
URL: http://svn.freebsd.org/changeset/base/220865

Log:
  Scenario:
  - We have two nodes connected and synchronized (local counters on both sides
    are 0).
  - We take secondary down and recreate it.
  - Primary connects to it and starts synchronization (but local counters are
    still 0).
  - We switch the roles.
  - Synchronization restarts but data is synchronized now from new primary
    (because local counters are 0) that doesn't have new data yet.
  
  This fix this issue we bump local counter on primary when we discover that
  connected secondary was recreated and has no data yet.
  
  Reported by:	trociny
  Discussed with:	trociny
  Tested by:	trociny
  MFC after:	1 week

Modified:
  head/sbin/hastd/primary.c
  head/sbin/hastd/secondary.c

Modified: head/sbin/hastd/primary.c
==============================================================================
--- head/sbin/hastd/primary.c	Tue Apr 19 18:18:02 2011	(r220864)
+++ head/sbin/hastd/primary.c	Tue Apr 19 19:26:27 2011	(r220865)
@@ -667,6 +667,25 @@ init_remote(struct hast_resource *res, s
 	res->hr_secondary_localcnt = nv_get_uint64(nvin, "localcnt");
 	res->hr_secondary_remotecnt = nv_get_uint64(nvin, "remotecnt");
 	res->hr_syncsrc = nv_get_uint8(nvin, "syncsrc");
+	if (nv_exists(nvin, "virgin")) {
+		/*
+		 * Secondary was reinitialized, bump localcnt if it is 0 as
+		 * only we have the data.
+		 */
+		PJDLOG_ASSERT(res->hr_syncsrc == HAST_SYNCSRC_PRIMARY);
+		PJDLOG_ASSERT(res->hr_secondary_localcnt == 0);
+
+		if (res->hr_primary_localcnt == 0) {
+			PJDLOG_ASSERT(res->hr_secondary_remotecnt == 0);
+
+			mtx_lock(&metadata_lock);
+			res->hr_primary_localcnt++;
+			pjdlog_debug(1, "Increasing localcnt to %ju.",
+			    (uintmax_t)res->hr_primary_localcnt);
+			(void)metadata_write(res);
+			mtx_unlock(&metadata_lock);
+		}
+	}
 	map = NULL;
 	mapsize = nv_get_uint32(nvin, "mapsize");
 	if (mapsize > 0) {

Modified: head/sbin/hastd/secondary.c
==============================================================================
--- head/sbin/hastd/secondary.c	Tue Apr 19 18:18:02 2011	(r220864)
+++ head/sbin/hastd/secondary.c	Tue Apr 19 19:26:27 2011	(r220865)
@@ -261,6 +261,7 @@ init_remote(struct hast_resource *res, s
 		} else {
 			memset(map, 0xff, mapsize);
 		}
+		nv_add_int8(nvout, 1, "virgin");
 		nv_add_uint8(nvout, HAST_SYNCSRC_PRIMARY, "syncsrc");
 	} else if (res->hr_resuid != resuid) {
 		char errmsg[256];