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From: mwilck@suse.com
To: Christophe Varoqui <christophe.varoqui@opensvc.com>,
	Benjamin Marzinski <bmarzins@redhat.com>
Cc: lixiaokeng@huawei.com, dm-devel@redhat.com,
	Martin Wilck <mwilck@suse.com>
Subject: [dm-devel] [PATCH v2 14/29] libmultipath: add libmp_dm_exit()
Date: Fri, 16 Oct 2020 12:44:46 +0200
Message-ID: <20201016104501.8700-15-mwilck@suse.com> (raw)
In-Reply-To: <20201016104501.8700-1-mwilck@suse.com>

From: Martin Wilck <mwilck@suse.com>

This function prepares for calling dm_lib_exit() on program exit.
It undoes changes to libdm internals done by libmultipath.
It doesn't call dm_lib_exit(), as the caller may want to keep
libdm active.

Signed-off-by: Martin Wilck <mwilck@suse.com>
---
 libmultipath/config.c    |  1 +
 libmultipath/config.h    |  2 ++
 libmultipath/devmapper.c | 15 +++++++++++++++
 libmultipath/devmapper.h |  1 +
 4 files changed, 19 insertions(+)

diff --git a/libmultipath/config.c b/libmultipath/config.c
index f74417c..b9cb413 100644
--- a/libmultipath/config.c
+++ b/libmultipath/config.c
@@ -60,6 +60,7 @@ int libmultipath_init(void)
 static void _libmultipath_exit(void)
 {
 	libmultipath_exit_called = true;
+	libmp_dm_exit();
 	udev_unref(udev);
 }
 
diff --git a/libmultipath/config.h b/libmultipath/config.h
index f478df7..5d46035 100644
--- a/libmultipath/config.h
+++ b/libmultipath/config.h
@@ -271,6 +271,8 @@ int libmultipath_init(void);
  *
  * This function un-initializes libmultipath data structures.
  * It is recommended to call this function at program exit.
+ * If the application also calls dm_lib_exit(), it should do so
+ * after libmultipath_exit().
  *
  * Calls to libmultipath_init() after libmultipath_exit() will fail
  * (in other words, libmultipath can't be re-initialized).
diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
index 2e3ae8a..a8e0611 100644
--- a/libmultipath/devmapper.c
+++ b/libmultipath/devmapper.c
@@ -333,6 +333,20 @@ void libmp_udev_set_sync_support(int on)
 	libmp_dm_udev_sync = !!on;
 }
 
+static bool libmp_dm_init_called;
+void libmp_dm_exit(void)
+{
+	if (!libmp_dm_init_called)
+		return;
+
+	/* switch back to default libdm logging */
+	dm_log_init(NULL);
+#ifdef LIBDM_API_HOLD_CONTROL
+	/* make sure control fd is closed in dm_lib_release() */
+	dm_hold_control_dev(0);
+#endif
+}
+
 static void libmp_dm_init(void)
 {
 	struct config *conf;
@@ -349,6 +363,7 @@ static void libmp_dm_init(void)
 	dm_hold_control_dev(1);
 #endif
 	dm_udev_set_sync_support(libmp_dm_udev_sync);
+	libmp_dm_init_called = true;
 }
 
 static void _do_skip_libmp_dm_init(void)
diff --git a/libmultipath/devmapper.h b/libmultipath/devmapper.h
index 158057e..ecf2e66 100644
--- a/libmultipath/devmapper.h
+++ b/libmultipath/devmapper.h
@@ -35,6 +35,7 @@ enum {
 
 int dm_prereq(unsigned int *v);
 void skip_libmp_dm_init(void);
+void libmp_dm_exit(void);
 void libmp_udev_set_sync_support(int on);
 struct dm_task *libmp_dm_task_create(int task);
 int dm_simplecmd_flush (int, const char *, uint16_t);
-- 
2.28.0


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  parent reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-16 10:44 [dm-devel] [PATCH v2 00/29] libmultipath: improve cleanup on exit mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 01/29] multipathd: uxlsnr: avoid deadlock " mwilck
2020-10-20 19:04   ` Benjamin Marzinski
2020-10-16 10:44 ` [dm-devel] [PATCH v2 02/29] multipathd: Fix liburcu memory leak mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 03/29] multipathd: move handling of io_err_stat_attr into libmultipath mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 04/29] multipathd: move vecs desctruction into cleanup function mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 05/29] multipathd: make some globals static mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 06/29] multipathd: move threads destruction into separate function mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 07/29] multipathd: move conf " mwilck
2020-10-19 18:56   ` Benjamin Marzinski
2020-10-16 10:44 ` [dm-devel] [PATCH v2 08/29] multipathd: move pid " mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 09/29] multipathd: close pidfile on exit mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 10/29] multipathd: add helper for systemd notification at exit mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 11/29] multipathd: child(): call cleanups in failure case, too mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 12/29] multipathd: unwatch_all_dmevents: check if waiter is initialized mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 13/29] multipathd: print error message if config can't be loaded mwilck
2020-10-16 10:44 ` mwilck [this message]
2020-10-19 19:07   ` [dm-devel] [PATCH v2 14/29] libmultipath: add libmp_dm_exit() Benjamin Marzinski
2020-10-16 10:44 ` [dm-devel] [PATCH v2 15/29] multipathd: fixup libdm deinitialization mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 16/29] libmultipath: log_thread_stop(): check if logarea is initialized mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 17/29] multipathd: add cleanup_child() exit handler mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 18/29] libmultipath: fix log_thread startup and teardown mwilck
2020-10-19 20:00   ` Benjamin Marzinski
2020-10-26 13:58     ` Martin Wilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 19/29] multipathd: move cleanup_{prio, checkers, foreign} to libmultipath_exit mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 20/29] multipath: use atexit() for cleanup handlers mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 21/29] mpathpersist: " mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 22/29] multipath: fix leaks in check_path_valid() mwilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 23/29] multipath-tools: mpath-tools.supp: file with valgrind suppressions mwilck
2020-10-19 20:01   ` Benjamin Marzinski
2020-10-16 10:44 ` [dm-devel] [PATCH v2 24/29] libmultipath: use libmp_verbosity to track verbosity mwilck
2020-10-19 20:38   ` Benjamin Marzinski
2020-10-26 14:47     ` Martin Wilck
2020-10-16 10:44 ` [dm-devel] [PATCH v2 25/29] libmultipath: introduce symbolic values for logsink mwilck
2020-10-16 20:13   ` Benjamin Marzinski
2020-10-16 10:44 ` [dm-devel] [PATCH v2 26/29] libmultipath: simplify dlog() mwilck
2020-10-19 21:07   ` Benjamin Marzinski
2020-10-16 10:44 ` [dm-devel] [PATCH v2 27/29] multipathd: common code for "-k" and command args mwilck
2020-10-19 21:51   ` Benjamin Marzinski
2020-10-16 10:45 ` [dm-devel] [PATCH v2 28/29] multipathd: sanitize uxsock_listen() mwilck
2020-10-19 23:33   ` Benjamin Marzinski
2020-10-26 13:54     ` Martin Wilck
2020-10-16 10:45 ` [dm-devel] [PATCH v2 29/29] libmultipath: fix race between log_safe and log_thread_stop() mwilck
2020-10-20  2:20   ` Benjamin Marzinski
2020-10-26 16:22     ` Martin Wilck
2020-10-26 17:24       ` Martin Wilck
2020-11-03  0:11         ` Benjamin Marzinski
2020-11-04 12:36           ` Martin Wilck
2020-11-04 15:46             ` Benjamin Marzinski

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