[dm-devel] [PATCH v2 11/37] libmultipath: add global variable for current bindings

[mwilck at suse.com]

From: Martin Wilck <mwilck at suse.com>

Add a variable global_bindings that holds the currently active vector of
bindings. This variable is freed at program exit.

Signed-off-by: Martin Wilck <mwilck at suse.com>
Reviewed-by: Benjamin Marzinski <bmarzins at redhat.com>
---
 libmultipath/alias.c              | 11 +++++++++--
 libmultipath/alias.h              |  1 +
 libmultipath/libmultipath.version |  1 +
 multipath/main.c                  |  2 ++
 multipathd/main.c                 |  1 +
 5 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/libmultipath/alias.c b/libmultipath/alias.c
index b95cbbe..701e7a2 100644
--- a/libmultipath/alias.c
+++ b/libmultipath/alias.c
@@ -511,6 +511,7 @@ static void _free_binding(struct binding *bdg)
  * an abstract type.
  */
 typedef struct _vector Bindings;
+static Bindings global_bindings = { .allocated = 0 };
 
 static void free_bindings(Bindings *bindings)
 {
@@ -522,6 +523,11 @@ static void free_bindings(Bindings *bindings)
 	vector_reset(bindings);
 }
 
+void cleanup_bindings(void)
+{
+	free_bindings(&global_bindings);
+}
+
 enum {
 	BINDING_EXISTS,
 	BINDING_CONFLICT,
@@ -751,7 +757,6 @@ int check_alias_settings(const struct config *conf)
 	pthread_cleanup_pop(1);
 	pthread_cleanup_pop(1);
 
-	pthread_cleanup_push_cast(free_bindings, &bindings);
 	fd = open_file(conf->bindings_file, &can_write, BINDINGS_FILE_HEADER);
 	if (fd != -1) {
 		FILE *file = fdopen(fd, "r");
@@ -771,6 +776,8 @@ int check_alias_settings(const struct config *conf)
 			close(fd);
 		}
 	}
-	pthread_cleanup_pop(1);
+
+	cleanup_bindings();
+	global_bindings = bindings;
 	return rc;
 }
diff --git a/libmultipath/alias.h b/libmultipath/alias.h
index fa33223..37b49d9 100644
--- a/libmultipath/alias.h
+++ b/libmultipath/alias.h
@@ -9,5 +9,6 @@ char *get_user_friendly_alias(const char *wwid, const char *file,
 
 struct config;
 int check_alias_settings(const struct config *);
+void cleanup_bindings(void);
 
 #endif /* _ALIAS_H */
diff --git a/libmultipath/libmultipath.version b/libmultipath/libmultipath.version
index a7b8c33..ddd302f 100644
--- a/libmultipath/libmultipath.version
+++ b/libmultipath/libmultipath.version
@@ -64,6 +64,7 @@ global:
 	checker_name;
 	checker_state_name;
 	check_foreign;
+	cleanup_bindings;
 	cleanup_lock;
 	coalesce_paths;
 	count_active_paths;
diff --git a/multipath/main.c b/multipath/main.c
index b78f316..45e9745 100644
--- a/multipath/main.c
+++ b/multipath/main.c
@@ -843,6 +843,8 @@ main (int argc, char *argv[])
 	conf->force_sync = 1;
 	if (atexit(cleanup_vecs))
 		condlog(1, "failed to register cleanup handler for vecs: %m");
+	if (atexit(cleanup_bindings))
+		condlog(1, "failed to register cleanup handler for bindings: %m");
 	while ((arg = getopt(argc, argv, ":adDcChl::eFfM:v:p:b:BrR:itTquUwW")) != EOF ) {
 		switch(arg) {
 		case 'v':
diff --git a/multipathd/main.c b/multipathd/main.c
index 2e02a54..214ed4a 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -3325,6 +3325,7 @@ static void cleanup_child(void)
 {
 	cleanup_threads();
 	cleanup_vecs();
+	cleanup_bindings();
 	if (poll_dmevents)
 		cleanup_dmevent_waiter();
 
-- 
2.42.0