From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martin Wilck <mwilck@suse.com>
Date: Wed, 23 Sep 2020 10:33:12 +0200
Subject: [PATCH] multipathd: move handling of io_err_stat_attr into
 libmultipath

This thread attribute can be dynamically initialized and destroyed.
No need to carry it along in multipathd. Removal of the symbol
requires to bump the ABI version to 3.

Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
 libmultipath/io_err_stat.c        |  7 +++++--
 libmultipath/libmultipath.version | 23 ++++++++---------------
 multipathd/main.c                 |  2 --
 3 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/libmultipath/io_err_stat.c b/libmultipath/io_err_stat.c
index 58bc1dd2..5363049d 100644
--- a/libmultipath/io_err_stat.c
+++ b/libmultipath/io_err_stat.c
@@ -34,6 +34,7 @@
 #include "lock.h"
 #include "time-util.h"
 #include "io_err_stat.h"
+#include "util.h"
 
 #define TIMEOUT_NO_IO_NSEC		10000000 /*10ms = 10000000ns*/
 #define FLAKY_PATHFAIL_THRESHOLD	2
@@ -70,8 +71,7 @@ struct io_err_stat_path {
 	int		err_rate_threshold;
 };
 
-pthread_t		io_err_stat_thr;
-pthread_attr_t		io_err_stat_attr;
+static pthread_t	io_err_stat_thr;
 
 static pthread_mutex_t io_err_thread_lock = PTHREAD_MUTEX_INITIALIZER;
 static pthread_cond_t io_err_thread_cond = PTHREAD_COND_INITIALIZER;
@@ -727,6 +727,7 @@ static void *io_err_stat_loop(void *data)
 int start_io_err_stat_thread(void *data)
 {
 	int ret;
+	pthread_attr_t io_err_stat_attr;
 
 	if (uatomic_read(&io_err_thread_running) == 1)
 		return 0;
@@ -739,6 +740,7 @@ int start_io_err_stat_thread(void *data)
 	if (!paths)
 		goto destroy_ctx;
 
+	setup_thread_attr(&io_err_stat_attr, 32 * 1024, 0);
 	pthread_mutex_lock(&io_err_thread_lock);
 	pthread_cleanup_push(cleanup_unlock, &io_err_thread_lock);
 
@@ -750,6 +752,7 @@ int start_io_err_stat_thread(void *data)
 				 &io_err_thread_lock) == 0);
 
 	pthread_cleanup_pop(1);
+	pthread_attr_destroy(&io_err_stat_attr);
 
 	if (ret) {
 		io_err_stat_log(0, "cannot create io_error statistic thread");
diff --git a/libmultipath/libmultipath.version b/libmultipath/libmultipath.version
index 0c300c81..84beb7f0 100644
--- a/libmultipath/libmultipath.version
+++ b/libmultipath/libmultipath.version
@@ -31,7 +31,7 @@
  *   The new version inherits the previous ones.
  */
 
-LIBMULTIPATH_2.0.0 {
+LIBMULTIPATH_3.0.0 {
 global:
 	/* symbols referenced by multipath and multipathd */
 	add_foreign;
@@ -121,7 +121,6 @@ global:
 	init_checkers;
 	init_foreign;
 	init_prio;
-	io_err_stat_attr;
 	io_err_stat_handle_pathfail;
 	is_path_valid;
 	is_quote;
@@ -242,30 +241,24 @@ global:
 	free_scandir_result;
 	sysfs_attr_get_value;
 
-local:
-	*;
-};
-
-LIBMULTIPATH_2.1.0 {
-global:
+	/* added in 2.1.0 */
 	libmp_dm_task_run;
 	cleanup_mutex;
-} LIBMULTIPATH_2.0.0;
 
-LIBMULTIPATH_2.2.0 {
-global:
+	/* added in 2.2.0 */
 	libmp_get_multipath_config;
 	get_multipath_config;
 	libmp_put_multipath_config;
 	put_multipath_config;
 	init_config;
 	uninit_config;
-} LIBMULTIPATH_2.1.0;
 
-LIBMULTIPATH_2.3.0 {
-global:
+	/* added in 2.3.0 */
 	udev;
 	logsink;
 	libmultipath_init;
 	libmultipath_exit;
-} LIBMULTIPATH_2.2.0;
+
+local:
+	*;
+};
diff --git a/multipathd/main.c b/multipathd/main.c
index ce14bb66..abc6a9f7 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -2954,7 +2954,6 @@ child (__attribute__((unused)) void *param)
 	setup_thread_attr(&misc_attr, 64 * 1024, 0);
 	setup_thread_attr(&uevent_attr, DEFAULT_UEVENT_STACKSIZE * 1024, 0);
 	setup_thread_attr(&waiter_attr, 32 * 1024, 1);
-	setup_thread_attr(&io_err_stat_attr, 32 * 1024, 0);
 
 	if (logsink == 1) {
 		setup_thread_attr(&log_attr, 64 * 1024, 0);
@@ -3164,7 +3163,6 @@ child (__attribute__((unused)) void *param)
 	rcu_assign_pointer(multipath_conf, NULL);
 	call_rcu(&conf->rcu, rcu_free_config);
 	pthread_attr_destroy(&waiter_attr);
-	pthread_attr_destroy(&io_err_stat_attr);
 #ifdef _DEBUG_
 	dbg_free_final(NULL);
 #endif