90 lines
2.7 KiB
Diff
90 lines
2.7 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Martin Wilck <mwilck@suse.com>
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Date: Wed, 23 Sep 2020 21:02:45 +0200
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Subject: [PATCH] libmultipath: add libmp_dm_exit()
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This function prepares for calling dm_lib_exit() on program exit.
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It undoes changes to libdm internals done by libmultipath.
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It doesn't call dm_lib_exit(), as the caller may want to keep
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libdm active.
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Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/config.c | 1 +
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libmultipath/config.h | 2 ++
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libmultipath/devmapper.c | 15 +++++++++++++++
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libmultipath/devmapper.h | 1 +
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4 files changed, 19 insertions(+)
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diff --git a/libmultipath/config.c b/libmultipath/config.c
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index f74417c6..b9cb4131 100644
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--- a/libmultipath/config.c
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+++ b/libmultipath/config.c
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@@ -60,6 +60,7 @@ int libmultipath_init(void)
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static void _libmultipath_exit(void)
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{
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libmultipath_exit_called = true;
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+ libmp_dm_exit();
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udev_unref(udev);
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}
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diff --git a/libmultipath/config.h b/libmultipath/config.h
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index f478df71..5d460359 100644
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--- a/libmultipath/config.h
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+++ b/libmultipath/config.h
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@@ -271,6 +271,8 @@ int libmultipath_init(void);
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*
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* This function un-initializes libmultipath data structures.
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* It is recommended to call this function at program exit.
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+ * If the application also calls dm_lib_exit(), it should do so
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+ * after libmultipath_exit().
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*
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* Calls to libmultipath_init() after libmultipath_exit() will fail
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* (in other words, libmultipath can't be re-initialized).
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diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
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index 4eb6f539..e60ab493 100644
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--- a/libmultipath/devmapper.c
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+++ b/libmultipath/devmapper.c
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@@ -335,6 +335,20 @@ void libmp_udev_set_sync_support(int on)
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libmp_dm_udev_sync = !!on;
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}
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+static bool libmp_dm_init_called;
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+void libmp_dm_exit(void)
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+{
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+ if (!libmp_dm_init_called)
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+ return;
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+
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+ /* switch back to default libdm logging */
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+ dm_log_init(NULL);
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+#ifdef LIBDM_API_HOLD_CONTROL
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+ /* make sure control fd is closed in dm_lib_release() */
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+ dm_hold_control_dev(0);
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+#endif
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+}
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+
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static void libmp_dm_init(void)
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{
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struct config *conf;
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@@ -351,6 +365,7 @@ static void libmp_dm_init(void)
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dm_hold_control_dev(1);
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#endif
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dm_udev_set_sync_support(libmp_dm_udev_sync);
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+ libmp_dm_init_called = true;
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}
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static void _do_skip_libmp_dm_init(void)
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diff --git a/libmultipath/devmapper.h b/libmultipath/devmapper.h
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index fa6b3c53..e29b4d41 100644
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--- a/libmultipath/devmapper.h
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+++ b/libmultipath/devmapper.h
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@@ -35,6 +35,7 @@ enum {
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int dm_prereq(unsigned int *v);
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void skip_libmp_dm_init(void);
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+void libmp_dm_exit(void);
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void libmp_udev_set_sync_support(int on);
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struct dm_task *libmp_dm_task_create(int task);
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int dm_simplecmd_flush (int, const char *, uint16_t);
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