[Cluster-devel] [PATCH] cman: Make qdiskd exit if removed from configuration

[Lon Hohberger <lhh@redhat.com>]

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 <lhh@redhat.com>
---
 cman/qdisk/main.c |   33 +++++++++++++++++++++++++++++++--
 1 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/cman/qdisk/main.c b/cman/qdisk/main.c
index 78dc3f0..4bb2b16 100644
--- a/cman/qdisk/main.c
+++ b/cman/qdisk/main.c
@@ -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);
 	}
-- 
1.7.1.1