[dm-devel] [PATCH 01/30] multipath: bind lifetime of udev context to main thread
Hannes Reinecke
hare at suse.de
Tue Jul 16 07:12:52 UTC 2013
We have to tie the lifetime of the udev context to the thread
or program. The current approach by creating it on config_load()
will invalidate the context during reconfiguration, thereby
causing all still existent objects to refer to an invalid pointer.
And resulting in a nice crash.
Signed-off-by: Hannes Reinecke <hare at suse.de>
---
libmpathpersist/mpath_persist.c | 7 ++++---
libmpathpersist/mpath_persist.h | 2 +-
libmpathpersist/mpath_pr_ioctl.c | 5 +++--
libmultipath/config.c | 9 +++------
libmultipath/config.h | 2 +-
mpathpersist/main.c | 11 +++++++----
multipath/main.c | 12 ++++++++----
multipathd/main.c | 11 ++++++++---
8 files changed, 35 insertions(+), 24 deletions(-)
diff --git a/libmpathpersist/mpath_persist.c b/libmpathpersist/mpath_persist.c
index 3041089..bd30125 100644
--- a/libmpathpersist/mpath_persist.c
+++ b/libmpathpersist/mpath_persist.c
@@ -1,4 +1,3 @@
-#include "mpath_persist.h"
#include <libdevmapper.h>
#include <defaults.h>
#include <sys/stat.h>
@@ -8,6 +7,7 @@
#include <checkers.h>
#include <structs.h>
#include <structs_vec.h>
+#include <libudev.h>
#include <prio.h>
#include <unistd.h>
@@ -20,6 +20,7 @@
#include <ctype.h>
#include <propsel.h>
+#include "mpath_persist.h"
#include "mpathpr.h"
#include "mpath_pr_ioctl.h"
@@ -32,9 +33,9 @@
int
-mpath_lib_init (void)
+mpath_lib_init (struct udev *udev)
{
- if (load_config(DEFAULT_CONFIGFILE)){
+ if (load_config(DEFAULT_CONFIGFILE, udev)){
condlog(0, "Failed to initialize multipath config.");
return 1;
}
diff --git a/libmpathpersist/mpath_persist.h b/libmpathpersist/mpath_persist.h
index d8ff6f2..a5e7868 100644
--- a/libmpathpersist/mpath_persist.h
+++ b/libmpathpersist/mpath_persist.h
@@ -174,7 +174,7 @@ struct prout_param_descriptor { /* PROUT parameter descriptor */
*
* RETURNS: 0->Success, 1->Failed.
*/
-extern int mpath_lib_init (void );
+extern int mpath_lib_init (struct udev *udev);
/*
diff --git a/libmpathpersist/mpath_pr_ioctl.c b/libmpathpersist/mpath_pr_ioctl.c
index de3292e..c85fd10 100644
--- a/libmpathpersist/mpath_pr_ioctl.c
+++ b/libmpathpersist/mpath_pr_ioctl.c
@@ -10,8 +10,9 @@
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
-#include "mpath_pr_ioctl.h"
-#include <mpath_persist.h>
+#include <libudev.h>
+#include "mpath_pr_ioctl.h"
+#include <mpath_persist.h>
#include <debug.h>
diff --git a/libmultipath/config.c b/libmultipath/config.c
index da676df..a322dfe 100644
--- a/libmultipath/config.c
+++ b/libmultipath/config.c
@@ -466,9 +466,6 @@ free_config (struct config * conf)
if (conf->dev)
FREE(conf->dev);
- if (conf->udev)
- udev_unref(conf->udev);
-
if (conf->multipath_dir)
FREE(conf->multipath_dir);
@@ -518,12 +515,12 @@ free_config (struct config * conf)
}
int
-load_config (char * file)
+load_config (char * file, struct udev *udev)
{
if (!conf)
conf = alloc_config();
- if (!conf)
+ if (!conf || !udev)
return 1;
/*
@@ -532,7 +529,7 @@ load_config (char * file)
if (!conf->verbosity)
conf->verbosity = DEFAULT_VERBOSITY;
- conf->udev = udev_new();
+ conf->udev = udev;
dm_drv_version(conf->version, TGT_MPATH);
conf->dev_type = DEV_NONE;
conf->minio = DEFAULT_MINIO;
diff --git a/libmultipath/config.h b/libmultipath/config.h
index 4ade355..405a8f3 100644
--- a/libmultipath/config.h
+++ b/libmultipath/config.h
@@ -157,7 +157,7 @@ void free_mptable (vector mptable);
int store_hwe (vector hwtable, struct hwentry *);
-int load_config (char * file);
+int load_config (char * file, struct udev * udev);
struct config * alloc_config (void);
void free_config (struct config * conf);
diff --git a/mpathpersist/main.c b/mpathpersist/main.c
index 465fcb1..e3484b5 100644
--- a/mpathpersist/main.c
+++ b/mpathpersist/main.c
@@ -7,6 +7,7 @@
#include <vector.h>
#include <structs.h>
#include <getopt.h>
+#include <libudev.h>
#include <mpath_persist.h>
#include "main.h"
#include <pthread.h>
@@ -68,7 +69,8 @@ int main (int argc, char * argv[])
int noisy = 0;
int num_transport =0;
void *resp = NULL;
- struct transportid * tmp;
+ struct transportid * tmp;
+ struct udev *udev = NULL;
if (optind == argc)
{
@@ -84,8 +86,8 @@ int main (int argc, char * argv[])
exit (1);
}
-
- mpath_lib_init();
+ udev = udev_new();
+ mpath_lib_init(udev);
memset(transportids,0,MPATH_MX_TIDS);
while (1)
@@ -461,12 +463,13 @@ int main (int argc, char * argv[])
if (res < 0)
{
mpath_lib_exit();
+ udev_unref(udev);
return MPATH_PR_FILE_ERROR;
}
out :
mpath_lib_exit();
-
+ udev_unref(udev);
return (ret >= 0) ? ret : MPATH_PR_OTHER;
}
diff --git a/multipath/main.c b/multipath/main.c
index f1b3ec9..4a8b966 100644
--- a/multipath/main.c
+++ b/multipath/main.c
@@ -27,6 +27,7 @@
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
+#include <libudev.h>
#include <checkers.h>
#include <prio.h>
@@ -435,6 +436,7 @@ convert_dev(char *dev)
int
main (int argc, char *argv[])
{
+ struct udev *udev;
int arg;
extern char *optarg;
extern int optind;
@@ -445,10 +447,12 @@ main (int argc, char *argv[])
exit(1);
}
+ udev = udev_new();
+
if (dm_prereq())
exit(1);
- if (load_config(DEFAULT_CONFIGFILE))
+ if (load_config(DEFAULT_CONFIGFILE, udev))
exit(1);
while ((arg = getopt(argc, argv, ":dchl::FfM:v:p:b:BrtqwW")) != EOF ) {
@@ -560,11 +564,11 @@ main (int argc, char *argv[])
if (init_checkers()) {
condlog(0, "failed to initialize checkers");
- exit(1);
+ goto out;
}
if (init_prio()) {
condlog(0, "failed to initialize prioritizers");
- exit(1);
+ goto out;
}
dm_init();
@@ -628,7 +632,7 @@ out:
*/
free_config(conf);
conf = NULL;
-
+ udev_unref(udev);
#ifdef _DEBUG_
dbg_free_final(NULL);
#endif
diff --git a/multipathd/main.c b/multipathd/main.c
index 0fa1b17..aa5a298 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -93,6 +93,8 @@ static sem_t exit_sem;
*/
struct vectors * gvecs;
+struct udev * udev;
+
static int
need_switch_pathgroup (struct multipath * mpp, int refresh)
{
@@ -1403,7 +1405,7 @@ reconfigure (struct vectors * vecs)
vecs->pathvec = NULL;
conf = NULL;
- if (!load_config(DEFAULT_CONFIGFILE)) {
+ if (!load_config(DEFAULT_CONFIGFILE, udev)) {
conf->verbosity = old->verbosity;
conf->daemon = 1;
configure(vecs, 1);
@@ -1588,6 +1590,8 @@ child (void * param)
sem_init(&exit_sem, 0, 0);
signal_init();
+ udev = udev_new();
+
setup_thread_attr(&misc_attr, 64 * 1024, 1);
setup_thread_attr(&waiter_attr, 32 * 1024, 1);
@@ -1602,7 +1606,7 @@ child (void * param)
condlog(2, "--------start up--------");
condlog(2, "read " DEFAULT_CONFIGFILE);
- if (load_config(DEFAULT_CONFIGFILE))
+ if (load_config(DEFAULT_CONFIGFILE, udev))
exit(1);
if (init_checkers()) {
@@ -1752,7 +1756,8 @@ child (void * param)
*/
free_config(conf);
conf = NULL;
-
+ udev_unref(udev);
+ udev = NULL;
#ifdef _DEBUG_
dbg_free_final(NULL);
#endif
--
1.7.12.4
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