[dm-devel] [PATCH 06/11] libmultipath: checkers/prio: allow non-lazy .so loading

[mwilck at suse.com]

From: Martin Wilck <mwilck at suse.com>

If compiled with -DLOAD_ALL_SHARED_LIBS, all known prioritizers
and checkers will be loaded immediately on startup. This is useful
for determining symbol usage (start executables with LD_BIND_NOW=1).
---
 libmultipath/checkers.c | 17 +++++++++++++++++
 libmultipath/prio.c     | 22 ++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/libmultipath/checkers.c b/libmultipath/checkers.c
index f7ddd53..18b1f5e 100644
--- a/libmultipath/checkers.c
+++ b/libmultipath/checkers.c
@@ -7,6 +7,7 @@
 #include "debug.h"
 #include "checkers.h"
 #include "vector.h"
+#include "util.h"
 
 struct checker_class {
 	struct list_head node;
@@ -375,7 +376,23 @@ void checker_get(const char *multipath_dir, struct checker *dst,
 
 int init_checkers(const char *multipath_dir)
 {
+#ifdef LOAD_ALL_SHARED_LIBS
+	static const char *const all_checkers[] = {
+		DIRECTIO,
+		TUR,
+		HP_SW,
+		RDAC,
+		EMC_CLARIION,
+		READSECTOR0,
+		CCISS_TUR,
+	};
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(all_checkers); i++)
+		add_checker_class(multipath_dir, all_checkers[i]);
+#else
 	if (!add_checker_class(multipath_dir, DEFAULT_CHECKER))
 		return 1;
+#endif
 	return 0;
 }
diff --git a/libmultipath/prio.c b/libmultipath/prio.c
index 3a718ba..c92bde7 100644
--- a/libmultipath/prio.c
+++ b/libmultipath/prio.c
@@ -20,8 +20,30 @@ unsigned int get_prio_timeout(unsigned int timeout_ms,
 
 int init_prio (const char *multipath_dir)
 {
+#ifdef LOAD_ALL_SHARED_LIBS
+	static const char *const all_prios[] = {
+		PRIO_ALUA,
+		PRIO_CONST,
+		PRIO_DATACORE,
+		PRIO_EMC,
+		PRIO_HDS,
+		PRIO_HP_SW,
+		PRIO_ONTAP,
+		PRIO_RANDOM,
+		PRIO_RDAC,
+		PRIO_WEIGHTED_PATH,
+		PRIO_SYSFS,
+		PRIO_PATH_LATENCY,
+		PRIO_ANA,
+	};
+	unsigned int i;
+
+	for  (i = 0; i < ARRAY_SIZE(all_prios); i++)
+		add_prio(multipath_dir, all_prios[i]);
+#else
 	if (!add_prio(multipath_dir, DEFAULT_PRIO))
 		return 1;
+#endif
 	return 0;
 }
 
-- 
2.28.0