cman: Make qdiskd exit if removed from configuration

If qdiskd was previously configured and a configuration update removes the device & label fields, qdiskd will now set its votes to 0, unregister from CMAN, and exit.

Correct logging about device registration and configuration errors is also required in order for users to understand what is going on when this happens since the current logging from CMAN is a bit unclear.

This is a clean cherry-pick to the RHEL6 branch.

Resolves: rhbz#620679

Signed-off-by Lon Hohberger <[email protected]>

---
 cman/qdisk/main.c |   33 +++++++++++++++++++++++++++++++--
 1 files changed, 31 insertions(+), 2 deletions(-)

cman/qdisk/main.c +31 -2

index 78dc3f0..4bb2b16 100644
@@ -1430,13 +1430,36 @@ get_dynamic_config_data(qd_ctx *ctx, int ccsfd)
 {
 	char *val = NULL;
 	char query[256];
-	int old_votes = 0;
+	int old_votes = 0, found = 0;
 
 	if (ccsfd < 0)
 		return -1;
 
 	logt_print(LOG_DEBUG, "Loading dynamic configuration\n");
 
+	/* Check label / device presence.  If it disappeared, we need to exit */
+	if (ctx->qc_config) {
+		val = NULL;
+		snprintf(query, sizeof(query), "/cluster/quorumd/@device");
+		found = ccs_get(ccsfd, query, &val);
+		if (found != 0) {
+			val = NULL;
+			snprintf(query, sizeof(query), "/cluster/quorumd/@label");
+			found = ccs_get(ccsfd, query, &val);
+			free(val);
+		}
+
+		if (found != 0) {
+			logt_print(LOG_NOTICE,
+				   "Quorum device removed from the configuration."
+				   "  Shutting down.\n");
+			ctx->qc_votes = 0;
+			register_device(ctx);
+			_running = 0;
+			return -1;
+		}
+	}
+
 	/* Get status file */
 	snprintf(query, sizeof(query), "/cluster/quorumd/@status_file");
 	if (ccs_get(ccsfd, query, &val) == 0) {

@@ -1724,6 +1747,12 @@ get_static_config_data(qd_ctx *ctx, int ccsfd)
 		ctx->qc_label = val;
 	}
 
+	if (!ctx->qc_device && !ctx->qc_label) {
+		logt_print(LOG_ERR, "No device or label specified; cannot "
+			   "run QDisk services.\n");
+		return -1;
+	}
+
 	/* Get min score */
 	snprintf(query, sizeof(query), "/cluster/quorumd/@min_score");
 	if (ccs_get(ccsfd, query, &val) == 0) {

@@ -1765,7 +1794,6 @@ get_static_config_data(qd_ctx *ctx, int ccsfd)
 		free(val);
 	}
 
-
 	return 0;
 }
 

@@ -2049,6 +2077,7 @@ main(int argc, char **argv)
 
 	if (quorum_loop(&ctx, ni, MAX_NODES_DISK) == 0) {
 		/* Only clean up if we're exiting w/o error) */
+		logt_print(LOG_NOTICE, "Unregistering quorum device.\n");
 		cman_unregister_quorum_device(ctx.qc_cman_admin);
 		quorum_logout(&ctx);
 	}