X-Git-Url: http://git.samba.org/?a=blobdiff_plain;f=ctdb%2Fserver%2Fctdb_keepalive.c;h=a4569ec2502265af2d0ebed32e8a210339a24ad1;hb=f47d331e671d8835de010d3e9e1cbc6379e5ec27;hp=b4899b746f471ce3f4cde40faa22455b98f6178f;hpb=2e8aac6689f8fd8b3122b0d8b3188e36e3e03982;p=samba.git

diff --git a/ctdb/server/ctdb_keepalive.c b/ctdb/server/ctdb_keepalive.c
index b4899b746f4..a4569ec2502 100644
--- a/ctdb/server/ctdb_keepalive.c
+++ b/ctdb/server/ctdb_keepalive.c
@@ -18,17 +18,72 @@
    along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "includes.h"
-#include "lib/tevent/tevent.h"
+#include "replace.h"
 #include "system/filesys.h"
+#include "system/network.h"
+#include "system/time.h"
 #include "system/wait.h"
-#include "../include/ctdb_private.h"
 
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/debug.h"
+#include "lib/util/samba_util.h"
+
+#include "ctdb_private.h"
+#include "version.h"
+
+#include "common/common.h"
+#include "common/logging.h"
+
+
+static uint32_t keepalive_version(void)
+{
+	return (SAMBA_VERSION_MAJOR << 16) | SAMBA_VERSION_MINOR;
+}
+
+static uint32_t keepalive_uptime(struct ctdb_context *ctdb)
+{
+	struct timeval current = tevent_timeval_current();
+
+	return current.tv_sec - ctdb->ctdbd_start_time.tv_sec;
+}
+
+/*
+   send a keepalive packet to the other node
+*/
+static void ctdb_send_keepalive(struct ctdb_context *ctdb, uint32_t destnode)
+{
+	struct ctdb_req_keepalive_old *r;
+
+	if (ctdb->methods == NULL) {
+		DEBUG(DEBUG_INFO,
+		      ("Failed to send keepalive. Transport is DOWN\n"));
+		return;
+	}
+
+	r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_KEEPALIVE,
+				    sizeof(struct ctdb_req_keepalive_old),
+				    struct ctdb_req_keepalive_old);
+	CTDB_NO_MEMORY_FATAL(ctdb, r);
+	r->hdr.destnode  = destnode;
+	r->hdr.reqid     = 0;
+
+	r->version = keepalive_version();
+	r->uptime = keepalive_uptime(ctdb);
+
+	CTDB_INCREMENT_STAT(ctdb, keepalive_packets_sent);
+
+	ctdb_queue_packet(ctdb, &r->hdr);
+
+	talloc_free(r);
+}
 
 /*
   see if any nodes are dead
  */
-static void ctdb_check_for_dead_nodes(struct event_context *ev, struct timed_event *te, 
+static void ctdb_check_for_dead_nodes(struct tevent_context *ev,
+				      struct tevent_timer *te,
 				      struct timeval t, void *private_data)
 {
 	struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
@@ -78,26 +133,31 @@ static void ctdb_check_for_dead_nodes(struct event_context *ev, struct timed_eve
 
 		node->tx_cnt = 0;
 	}
-	
-	event_add_timed(ctdb->ev, ctdb->keepalive_ctx,
-			timeval_current_ofs(ctdb->tunable.keepalive_interval, 0), 
-			ctdb_check_for_dead_nodes, ctdb);
+
+	tevent_add_timer(ctdb->ev, ctdb->keepalive_ctx,
+			 timeval_current_ofs(ctdb->tunable.keepalive_interval, 0),
+			 ctdb_check_for_dead_nodes, ctdb);
 }
 
 
 void ctdb_start_keepalive(struct ctdb_context *ctdb)
 {
-	struct timed_event *te;
+	struct tevent_timer *te;
 
 	ctdb->keepalive_ctx = talloc_new(ctdb);
 	CTDB_NO_MEMORY_FATAL(ctdb, ctdb->keepalive_ctx);
 
-	te = event_add_timed(ctdb->ev, ctdb->keepalive_ctx,
-			     timeval_current_ofs(ctdb->tunable.keepalive_interval, 0), 
-			     ctdb_check_for_dead_nodes, ctdb);
+	te = tevent_add_timer(ctdb->ev, ctdb->keepalive_ctx,
+			      timeval_current_ofs(ctdb->tunable.keepalive_interval, 0),
+			      ctdb_check_for_dead_nodes, ctdb);
 	CTDB_NO_MEMORY_FATAL(ctdb, te);
 
 	DEBUG(DEBUG_NOTICE,("Keepalive monitoring has been started\n"));
+
+	if (ctdb->tunable.allow_mixed_versions == 1) {
+		DEBUG(DEBUG_WARNING,
+		      ("CTDB cluster with mixed versions configured\n"));
+	}
 }
 
 void ctdb_stop_keepalive(struct ctdb_context *ctdb)
@@ -106,3 +166,49 @@ void ctdb_stop_keepalive(struct ctdb_context *ctdb)
 	ctdb->keepalive_ctx = NULL;
 }
 
+void ctdb_request_keepalive(struct ctdb_context *ctdb,
+			    struct ctdb_req_header *hdr)
+{
+	struct ctdb_req_keepalive_old *c =
+		(struct ctdb_req_keepalive_old *)hdr;
+	uint32_t my_version = keepalive_version();
+	uint32_t my_uptime = keepalive_uptime(ctdb);
+
+	/* Don't check anything if mixed versions are allowed */
+	if (ctdb->tunable.allow_mixed_versions == 1) {
+		return;
+	}
+
+	if (hdr->length == sizeof(struct ctdb_req_header)) {
+		/* Old keepalive */
+		goto fail1;
+	}
+
+	if (c->version != my_version) {
+		if (c->uptime > my_uptime) {
+			goto fail2;
+		} else if (c->uptime == my_uptime) {
+			if (c->version > my_version) {
+				goto fail2;
+			}
+		}
+	}
+
+	return;
+
+fail1:
+	DEBUG(DEBUG_ERR,
+	      ("Keepalive version missing from node %u\n", hdr->srcnode));
+	goto shutdown;
+
+fail2:
+	DEBUG(DEBUG_ERR,
+	      ("Keepalive version mismatch 0x%08x != 0x%08x from node %u\n",
+	       my_version, c->version, hdr->srcnode));
+	goto shutdown;
+
+shutdown:
+	DEBUG(DEBUG_ERR,
+	      ("CTDB Cluster with mixed versions, cannot continue\n"));
+	ctdb_shutdown_sequence(ctdb, 0);
+}