Move dm_initialized out of libmp_dm_task_create(), and add
a function skip_libmp_dm_init() so that users of libmultipath can skip
initializing device-mapper. This is needed for other programs that
use libmultipath (or a library that depends on it) but want to control
how device-mapper is set up.
Also make dm_prereq a global function.
Reviewed-by: Martin Wilck <mwilck@xxxxxxxx>
Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
---
libmultipath/devmapper.c | 17 +++++++++++++----
libmultipath/devmapper.h | 3 ++-
2 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
index 13a1cf53..7ed494a1 100644
--- a/libmultipath/devmapper.c
+++ b/libmultipath/devmapper.c
@@ -33,6 +33,8 @@
#define MAX_WAIT 5
#define LOOPS_PER_SEC 5
+static pthread_once_t dm_initialized = PTHREAD_ONCE_INIT;
+
static int dm_conf_verbosity;
#ifdef LIBDM_API_DEFERRED
@@ -229,7 +231,7 @@ dm_tgt_prereq (unsigned int *ver)
return 1;
}
-static int dm_prereq(unsigned int *v)
+int dm_prereq(unsigned int *v)
{
if (dm_lib_prereq())
return 1;
@@ -243,7 +245,7 @@ void libmp_udev_set_sync_support(int on)
libmp_dm_udev_sync = !!on;
}
-void libmp_dm_init(void)
+static void libmp_dm_init(void)
{
struct config *conf;
int verbosity;
@@ -262,11 +264,18 @@ void libmp_dm_init(void)
dm_udev_set_sync_support(libmp_dm_udev_sync);
}
+static void _do_skip_libmp_dm_init(void)
+{
+}
+
+void skip_libmp_dm_init(void)
+{
+ pthread_once(&dm_initialized, _do_skip_libmp_dm_init);
+}
+
struct dm_task*
libmp_dm_task_create(int task)
{
- static pthread_once_t dm_initialized = PTHREAD_ONCE_INIT;
-
pthread_once(&dm_initialized, libmp_dm_init);
return dm_task_create(task);
}
diff --git a/libmultipath/devmapper.h b/libmultipath/devmapper.h
index 7557a86b..17fc9faf 100644
--- a/libmultipath/devmapper.h
+++ b/libmultipath/devmapper.h
@@ -28,7 +28,8 @@
#define UUID_PREFIX_LEN (sizeof(UUID_PREFIX) - 1)
void dm_init(int verbosity);
-void libmp_dm_init(void);
+int dm_prereq(unsigned int *v);
+void skip_libmp_dm_init(void);
void libmp_udev_set_sync_support(int on);
struct dm_task *libmp_dm_task_create(int task);
int dm_drv_version (unsigned int * version);
--
2.17.2
--
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