[dm-devel] [PATCH 11/21] multipathd: improve checker message logging

[Martin Wilck]

Don't rely on any variables being defined in LOG_MSG.
If message log level is low, don't bother to fetch the message.

Signed-off-by: Martin Wilck <mwilck at suse.com>
---
 multipathd/main.c | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/multipathd/main.c b/multipathd/main.c
index a9e1a4bd..1bd1518a 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -89,12 +89,22 @@ static int use_watchdog;
 #define FILE_NAME_SIZE 256
 #define CMDSIZE 160
 
-#define LOG_MSG(a, b) \
-do { \
-	if (pp->offline) \
-		condlog(a, "%s: %s - path offline", pp->mpp->alias, pp->dev); \
-	else if (strlen(b)) \
-		condlog(a, "%s: %s - %s", pp->mpp->alias, pp->dev, b); \
+#define LOG_MSG(lvl, verb, pp)					\
+do {								\
+	if (lvl <= verb) {					\
+		if (pp->offline)				\
+			condlog(lvl, "%s: %s - path offline",	\
+				pp->mpp->alias, pp->dev);	\
+		else {						\
+			const char *__m =			\
+				checker_message(&pp->checker);	\
+								\
+			if (strlen(__m))			\
+				condlog(lvl, "%s: %s - %s",	\
+					pp->mpp->alias,		\
+					pp->dev, __m);		\
+		}						\
+	}							\
 } while(0)
 
 struct mpath_event_param
@@ -1811,7 +1821,7 @@ check_path (struct vectors * vecs, struct path * pp, int ticks)
 	int add_active;
 	int disable_reinstate = 0;
 	int oldchkrstate = pp->chkrstate;
-	int retrigger_tries, checkint;
+	int retrigger_tries, checkint, verbosity;
 	struct config *conf;
 	int ret;
 
@@ -1827,6 +1837,7 @@ check_path (struct vectors * vecs, struct path * pp, int ticks)
 	conf = get_multipath_config();
 	retrigger_tries = conf->retrigger_tries;
 	checkint = conf->checkint;
+	verbosity = conf->verbosity;
 	put_multipath_config(conf);
 	if (!pp->mpp && pp->initialized == INIT_MISSING_UDEV) {
 		if (pp->retriggers < retrigger_tries) {
@@ -1961,7 +1972,7 @@ check_path (struct vectors * vecs, struct path * pp, int ticks)
 		int oldstate = pp->state;
 		pp->state = newstate;
 
-		LOG_MSG(1, checker_message(&pp->checker));
+		LOG_MSG(1, verbosity, pp);
 
 		/*
 		 * upon state change, reset the checkint
@@ -2050,7 +2061,8 @@ check_path (struct vectors * vecs, struct path * pp, int ticks)
 			}
 		} else {
 			unsigned int max_checkint;
-			LOG_MSG(4, checker_message(&pp->checker));
+
+			LOG_MSG(4, verbosity, pp);
 			conf = get_multipath_config();
 			max_checkint = conf->max_checkint;
 			put_multipath_config(conf);
@@ -2083,9 +2095,9 @@ check_path (struct vectors * vecs, struct path * pp, int ticks)
 			log_checker_err = conf->log_checker_err;
 			put_multipath_config(conf);
 			if (log_checker_err == LOG_CHKR_ERR_ONCE)
-				LOG_MSG(3, checker_message(&pp->checker));
+				LOG_MSG(3, verbosity, pp);
 			else
-				LOG_MSG(2, checker_message(&pp->checker));
+				LOG_MSG(2, verbosity, pp);
 		}
 	}
 
-- 
2.19.0