[dm-devel] [PATCH 2/5] libmultipath: don't copy pgpolicy string in get_pgpolicy_name

[Benjamin Marzinski]

copying the value into a passed in buffer doesn't help any of the
callers of this function. It's just wasted work.

Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
---
 libmultipath/dict.c       |  6 +-----
 libmultipath/pgpolicies.c | 27 ++++++++-------------------
 libmultipath/pgpolicies.h |  2 +-
 libmultipath/propsel.c    |  6 ++----
 4 files changed, 12 insertions(+), 29 deletions(-)

diff --git a/libmultipath/dict.c b/libmultipath/dict.c
index 2e9b45f9..dddd3cd6 100644
--- a/libmultipath/dict.c
+++ b/libmultipath/dict.c
@@ -1209,14 +1209,10 @@ set_pgpolicy(vector strvec, void *ptr, const char *file, int line_nr)
 int
 print_pgpolicy(struct strbuf *buff, long pgpolicy)
 {
-	char str[POLICY_NAME_SIZE];
-
 	if (!pgpolicy)
 		return 0;
 
-	get_pgpolicy_name(str, POLICY_NAME_SIZE, pgpolicy);
-
-	return append_strbuf_quoted(buff, str);
+	return append_strbuf_quoted(buff, get_pgpolicy_name(pgpolicy));
 }
 
 declare_def_handler(pgpolicy, set_pgpolicy)
diff --git a/libmultipath/pgpolicies.c b/libmultipath/pgpolicies.c
index e14da8cc..edc3c611 100644
--- a/libmultipath/pgpolicies.c
+++ b/libmultipath/pgpolicies.c
@@ -31,34 +31,23 @@ int get_pgpolicy_id(char * str)
 	return IOPOLICY_UNDEF;
 }
 
-int get_pgpolicy_name(char * buff, int len, int id)
+const char *get_pgpolicy_name(int id)
 {
-	char * s;
-
 	switch (id) {
 	case FAILOVER:
-		s = "failover";
-		break;
+		return "failover";
 	case MULTIBUS:
-		s = "multibus";
-		break;
+		return "multibus";
 	case GROUP_BY_SERIAL:
-		s = "group_by_serial";
-		break;
+		return "group_by_serial";
 	case GROUP_BY_PRIO:
-		s = "group_by_prio";
-		break;
+		return "group_by_prio";
 	case GROUP_BY_NODE_NAME:
-		s = "group_by_node_name";
-		break;
+		return "group_by_node_name";
 	case GROUP_BY_TPG:
-		s = "group_by_tpg";
-		break;
-	default:
-		s = "undefined";
-		break;
+		return "group_by_tpg";
 	}
-	return snprintf(buff, len, "%s", s);
+	return "undefined"; /* IOPOLICY_UNDEF */
 }
 
 
diff --git a/libmultipath/pgpolicies.h b/libmultipath/pgpolicies.h
index d3ab2f35..9e4ddda2 100644
--- a/libmultipath/pgpolicies.h
+++ b/libmultipath/pgpolicies.h
@@ -21,7 +21,7 @@ enum iopolicies {
 };
 
 int get_pgpolicy_id(char *);
-int get_pgpolicy_name (char *, int, int);
+const char *get_pgpolicy_name (int);
 int group_paths(struct multipath *, int);
 /*
  * policies
diff --git a/libmultipath/propsel.c b/libmultipath/propsel.c
index 841fa247..d214281b 100644
--- a/libmultipath/propsel.c
+++ b/libmultipath/propsel.c
@@ -268,7 +268,6 @@ verify_alua_prio(struct multipath *mp)
 int select_pgpolicy(struct config *conf, struct multipath * mp)
 {
 	const char *origin;
-	char buff[POLICY_NAME_SIZE];
 	int log_prio = 3;
 
 	if (conf->pgpolicy_flag > 0) {
@@ -288,9 +287,8 @@ out:
 		log_prio = 1;
 	}
 	mp->pgpolicyfn = pgpolicies[mp->pgpolicy];
-	get_pgpolicy_name(buff, POLICY_NAME_SIZE, mp->pgpolicy);
-	condlog(log_prio, "%s: path_grouping_policy = %s %s", mp->alias, buff,
-		origin);
+	condlog(log_prio, "%s: path_grouping_policy = %s %s", mp->alias,
+		get_pgpolicy_name(mp->pgpolicy), origin);
 	return 0;
 }
 
-- 
2.17.2