Blame SOURCES/0198-RHBZ-1372032-detect-path-checker.patch

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---
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 libmultipath/config.c      |    4 ++
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 libmultipath/config.h      |    2 +
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 libmultipath/defaults.h    |    1 
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 libmultipath/dict.c        |   74 +++++++++++++++++++++++++++++++++++++++++++++
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 libmultipath/discovery.c   |    1 
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 libmultipath/hwtable.c     |    1 
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 libmultipath/propsel.c     |   65 +++++++++++++++++++++++++++++++--------
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 libmultipath/propsel.h     |    1 
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 libmultipath/structs.h     |    7 ++++
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 multipath/multipath.conf.5 |    9 +++++
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 10 files changed, 152 insertions(+), 13 deletions(-)
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Index: multipath-tools-130222/libmultipath/config.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/config.c
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+++ multipath-tools-130222/libmultipath/config.c
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@@ -340,6 +340,7 @@ merge_hwe (struct hwentry * dst, struct
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 	merge_num(user_friendly_names);
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 	merge_num(retain_hwhandler);
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 	merge_num(detect_prio);
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+	merge_num(detect_checker);
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 	merge_num(deferred_remove);
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 	merge_num(delay_watch_checks);
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 	merge_num(delay_wait_checks);
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@@ -402,6 +403,7 @@ overwrite_hwe (struct hwentry * dst, str
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 	overwrite_num(user_friendly_names);
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 	overwrite_num(retain_hwhandler);
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 	overwrite_num(detect_prio);
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+	overwrite_num(detect_checker);
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 	overwrite_num(deferred_remove);
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 	overwrite_num(delay_watch_checks);
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 	overwrite_num(delay_wait_checks);
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@@ -476,6 +478,7 @@ store_hwe (vector hwtable, struct hwentr
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 	hwe->user_friendly_names = dhwe->user_friendly_names;
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 	hwe->retain_hwhandler = dhwe->retain_hwhandler;
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 	hwe->detect_prio = dhwe->detect_prio;
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+	hwe->detect_checker = dhwe->detect_checker;
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 	if (dhwe->bl_product && !(hwe->bl_product = set_param_str(dhwe->bl_product)))
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 		goto out;
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@@ -672,6 +675,7 @@ load_config (char * file, struct udev *u
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 	conf->fast_io_fail = DEFAULT_FAST_IO_FAIL;
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 	conf->retain_hwhandler = DEFAULT_RETAIN_HWHANDLER;
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 	conf->detect_prio = DEFAULT_DETECT_PRIO;
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+	conf->detect_checker = DEFAULT_DETECT_CHECKER;
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 	conf->deferred_remove = DEFAULT_DEFERRED_REMOVE;
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 	conf->hw_strmatch = 0;
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 	conf->force_sync = 0;
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Index: multipath-tools-130222/libmultipath/config.h
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/config.h
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+++ multipath-tools-130222/libmultipath/config.h
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@@ -61,6 +61,7 @@ struct hwentry {
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 	int user_friendly_names;
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 	int retain_hwhandler;
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 	int detect_prio;
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+	int detect_checker;
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 	int deferred_remove;
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 	int delay_watch_checks;
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 	int delay_wait_checks;
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@@ -136,6 +137,7 @@ struct config {
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 	int reassign_maps;
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 	int retain_hwhandler;
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 	int detect_prio;
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+	int detect_checker;
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 	int force_sync;
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 	int deferred_remove;
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 	int ignore_new_boot_devs;
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Index: multipath-tools-130222/libmultipath/defaults.h
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/defaults.h
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+++ multipath-tools-130222/libmultipath/defaults.h
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@@ -19,6 +19,7 @@
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 #define DEFAULT_FAST_IO_FAIL	5
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 #define DEFAULT_RETAIN_HWHANDLER RETAIN_HWHANDLER_OFF
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 #define DEFAULT_DETECT_PRIO DETECT_PRIO_OFF
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+#define DEFAULT_DETECT_CHECKER DETECT_CHECKER_OFF
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 #define DEFAULT_DEFERRED_REMOVE DEFERRED_REMOVE_OFF
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 #define DEFAULT_DELAY_CHECKS DELAY_CHECKS_OFF
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 #define DEFAULT_RETRIGGER_DELAY 10
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Index: multipath-tools-130222/libmultipath/dict.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/dict.c
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+++ multipath-tools-130222/libmultipath/dict.c
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@@ -714,6 +714,29 @@ def_detect_prio_handler(vector strvec)
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 }
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 static int
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+def_detect_checker_handler(vector strvec)
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+{
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+	char * buff;
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+
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+	buff = set_value(strvec);
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+
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+	if (!buff)
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+		return 1;
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+
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+	if ((strlen(buff) == 2 && !strcmp(buff, "no")) ||
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+	    (strlen(buff) == 1 && !strcmp(buff, "0")))
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+		conf->detect_checker = DETECT_CHECKER_OFF;
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+	else if ((strlen(buff) == 3 && !strcmp(buff, "yes")) ||
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+		 (strlen(buff) == 1 && !strcmp(buff, "1")))
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+		conf->detect_checker = DETECT_CHECKER_ON;
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+	else
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+		conf->detect_checker = DETECT_CHECKER_UNDEF;
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+
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+	FREE(buff);
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+	return 0;
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+}
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+
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+static int
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 def_hw_strmatch_handler(vector strvec)
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 {
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 	char *buff;
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@@ -1682,6 +1705,33 @@ hw_detect_prio_handler(vector strvec)
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 }
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 static int
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+hw_detect_checker_handler(vector strvec)
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+{
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+	struct hwentry *hwe = VECTOR_LAST_SLOT(conf->hwtable);
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+	char * buff;
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+
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+	if (!hwe)
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+		return 1;
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+
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+	buff = set_value(strvec);
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+
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+	if (!buff)
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+		return 1;
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+
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+	if ((strlen(buff) == 2 && !strcmp(buff, "no")) ||
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+	    (strlen(buff) == 1 && !strcmp(buff, "0")))
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+		hwe->detect_checker = DETECT_CHECKER_OFF;
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+	else if ((strlen(buff) == 3 && !strcmp(buff, "yes")) ||
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+		 (strlen(buff) == 1 && !strcmp(buff, "1")))
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+		hwe->detect_checker = DETECT_CHECKER_ON;
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+	else
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+		hwe->detect_checker = DETECT_CHECKER_UNDEF;
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+
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+	FREE(buff);
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+	return 0;
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+}
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+
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+static int
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 hw_deferred_remove_handler(vector strvec)
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 {
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 	struct hwentry *hwe = VECTOR_LAST_SLOT(conf->hwtable);
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@@ -3059,6 +3109,19 @@ snprint_detect_prio(char * buff, int len
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 }
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 static int
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+snprint_detect_checker(char * buff, int len, void * data)
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+{
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+	struct hwentry * hwe = (struct hwentry *)data;
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+
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+	if (hwe->detect_checker == DETECT_CHECKER_ON)
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+		return snprintf(buff, len, "yes");
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+	else if (hwe->detect_checker == DETECT_CHECKER_OFF)
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+		return snprintf(buff, len, "no");
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+	else
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+		return 0;
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+}
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+
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+static int
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 snprint_hw_max_sectors_kb(char * buff, int len, void * data)
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 {
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 	struct hwentry * hwe = (struct hwentry *)data;
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@@ -3424,6 +3487,15 @@ snprint_def_detect_prio(char * buff, int
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 }
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 static int
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+snprint_def_detect_checker(char * buff, int len, void * data)
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+{
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+	if (conf->detect_checker == DETECT_PRIO_ON)
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+		return snprintf(buff, len, "yes");
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+	else
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+		return snprintf(buff, len, "no");
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+}
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+
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+static int
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 snprint_def_hw_strmatch(char * buff, int len, void * data)
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 {
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 	if (conf->hw_strmatch)
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@@ -3611,6 +3683,7 @@ init_keywords(void)
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 	install_keyword("find_multipaths", &def_find_multipaths_handler, &snprint_def_find_multipaths);
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 	install_keyword("retain_attached_hw_handler", &def_retain_hwhandler_handler, &snprint_def_retain_hwhandler_handler);
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 	install_keyword("detect_prio", &def_detect_prio_handler, &snprint_def_detect_prio);
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+	install_keyword("detect_path_checker", &def_detect_checker_handler, &snprint_def_detect_checker);
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 	install_keyword("hw_str_match", &def_hw_strmatch_handler, &snprint_def_hw_strmatch);
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 	install_keyword("force_sync", &def_force_sync_handler, &snprint_def_force_sync);
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 	install_keyword("deferred_remove", &def_deferred_remove_handler, &snprint_def_deferred_remove);
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@@ -3690,6 +3763,7 @@ init_keywords(void)
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 	install_keyword("user_friendly_names", &hw_names_handler, &snprint_hw_user_friendly_names);
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 	install_keyword("retain_attached_hw_handler", &hw_retain_hwhandler_handler, &snprint_hw_retain_hwhandler_handler);
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 	install_keyword("detect_prio", &hw_detect_prio_handler, &snprint_detect_prio);
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+	install_keyword("detect_path_checker", &hw_detect_checker_handler, &snprint_detect_checker);
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 	install_keyword("deferred_remove", &hw_deferred_remove_handler, &snprint_hw_deferred_remove);
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 	install_keyword("delay_watch_checks", &hw_delay_watch_checks_handler, &snprint_hw_delay_watch_checks);
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 	install_keyword("delay_wait_checks", &hw_delay_wait_checks_handler, &snprint_hw_delay_wait_checks);
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Index: multipath-tools-130222/libmultipath/discovery.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/discovery.c
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+++ multipath-tools-130222/libmultipath/discovery.c
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@@ -1107,6 +1107,7 @@ get_state (struct path * pp, int daemon)
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 				return PATH_UNCHECKED;
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 			}
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 		}
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+		select_detect_checker(pp);
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 		select_checker(pp);
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 		if (!checker_selected(c)) {
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 			condlog(3, "%s: No checker selected", pp->dev);
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Index: multipath-tools-130222/libmultipath/hwtable.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/hwtable.c
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+++ multipath-tools-130222/libmultipath/hwtable.c
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@@ -289,6 +289,7 @@ static struct hwentry default_hw[] = {
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 		.prio_args     = NULL,
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 		.retain_hwhandler = RETAIN_HWHANDLER_ON,
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 		.detect_prio   = DETECT_PRIO_ON,
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+		.detect_checker = DETECT_CHECKER_ON,
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 	},
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 	{
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 		.vendor        = "EMC",
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Index: multipath-tools-130222/libmultipath/propsel.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/propsel.c
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+++ multipath-tools-130222/libmultipath/propsel.c
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@@ -335,11 +335,43 @@ select_hwhandler (struct multipath * mp)
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 	return 0;
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 }
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+int
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+detect_alua(struct path * pp)
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+{
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+	int ret;
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+	int tpgs = 0;
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+
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+	if ((tpgs = get_target_port_group_support(pp->fd)) <= 0)
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+		return 0;
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+	pp->tpgs = tpgs;
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+	ret = get_target_port_group(pp->fd, NULL);
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+	if (ret < 0)
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+		return 0;
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+	if (get_asymmetric_access_state(pp->fd, ret, NULL) < 0)
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+		return 0;
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+	return 1;
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+}
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+
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+void
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+detect_checker(struct path * pp)
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+{
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+	if (detect_alua(pp))
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+		checker_get(&pp->checker, TUR);
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+}
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+
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 extern int
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 select_checker(struct path *pp)
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 {
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 	struct checker * c = &pp->checker;
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+	if (pp->detect_checker == DETECT_CHECKER_ON) {
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+		detect_checker(pp);
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+		if (checker_selected(c)) {
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+			condlog(3, "%s: path checker = %s (detected setting)",
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+				pp->dev, checker_name(c));
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+			goto out;
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+		}
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+	}
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 	if (pp->hwe && pp->hwe->checker_name) {
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 		checker_get(c, pp->hwe->checker_name);
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 		condlog(3, "%s: path checker = %s (controller setting)",
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@@ -396,19 +428,8 @@ select_getuid (struct path * pp)
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 void
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 detect_prio(struct path * pp)
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 {
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-	int ret;
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-	struct prio *p = &pp->prio;
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-	int tpgs = 0;
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-
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-	if ((tpgs = get_target_port_group_support(pp->fd)) <= 0)
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-		return;
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-	pp->tpgs = tpgs;
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-	ret = get_target_port_group(pp->fd, NULL);
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-	if (ret < 0)
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-		return;
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-	if (get_asymmetric_access_state(pp->fd, ret, NULL) < 0)
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-		return;
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-	prio_get(p, PRIO_ALUA, DEFAULT_PRIO_ARGS);
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+	if (detect_alua(pp))
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+		prio_get(&pp->prio, PRIO_ALUA, DEFAULT_PRIO_ARGS);
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 }
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 extern int
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@@ -803,6 +824,24 @@ select_detect_prio (struct path * pp)
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 	return 0;
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 }
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+extern int
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+select_detect_checker (struct path * pp)
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+{
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+	if (pp->hwe && pp->hwe->detect_checker) {
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+		pp->detect_checker = pp->hwe->detect_checker;
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+		condlog(3, "%s: detect_checker = %d (controller default)", pp->dev, pp->detect_checker);
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+		return 0;
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+	}
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+	if (conf->detect_checker) {
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+		pp->detect_checker = conf->detect_checker;
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+		condlog(3, "%s: detect_checker = %d (config file default)", pp->dev, pp->detect_checker);
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+		return 0;
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+	}
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+	pp->detect_checker = DEFAULT_DETECT_CHECKER;
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+	condlog(3, "%s: detect_checker = %d (compiled in default)", pp->dev, pp->detect_checker);
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+	return 0;
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+}
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+
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 extern int
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 select_delay_watch_checks (struct multipath * mp)
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 {
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Index: multipath-tools-130222/libmultipath/propsel.h
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/propsel.h
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+++ multipath-tools-130222/libmultipath/propsel.h
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@@ -20,6 +20,7 @@ int select_dev_loss(struct multipath *mp
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 int select_reservation_key(struct multipath *mp);
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 int select_retain_hwhandler (struct multipath * mp);
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 int select_detect_prio(struct path * pp);
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+int select_detect_checker(struct path * pp);
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 int select_deferred_remove(struct multipath *mp);
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 int select_delay_watch_checks (struct multipath * mp);
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 int select_delay_wait_checks (struct multipath * mp);
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Index: multipath-tools-130222/libmultipath/structs.h
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/structs.h
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+++ multipath-tools-130222/libmultipath/structs.h
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@@ -115,6 +115,12 @@ enum detect_prio_states {
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 	DETECT_PRIO_ON,
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 };
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+enum detect_checker_states {
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+	DETECT_CHECKER_UNDEF,
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+	DETECT_CHECKER_OFF,
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+	DETECT_CHECKER_ON,
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+};
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+
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 enum deferred_remove_states {
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 	DEFERRED_REMOVE_UNDEF,
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 	DEFERRED_REMOVE_OFF,
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@@ -204,6 +210,7 @@ struct path {
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 	int priority;
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 	int pgindex;
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 	int detect_prio;
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+	int detect_checker;
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 	int watch_checks;
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 	int wait_checks;
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 	int tpgs;
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Index: multipath-tools-130222/multipath/multipath.conf.5
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===================================================================
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--- multipath-tools-130222.orig/multipath/multipath.conf.5
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+++ multipath-tools-130222/multipath/multipath.conf.5
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@@ -448,6 +448,15 @@ will automatically use the
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 prioritizer. If not, the prioritizer will be selected as usual. Default is
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 .I no
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 .TP
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+.B detect_checker
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+If set to
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+.I yes
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+, multipath will try to detect if the device supports ALUA. If so, the device
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+will automatically use the
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+.I tur
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+checker. If not, the prioritizer will be selected as ususal. Default is
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+.I no
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+.TP
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 .B hw_str_match
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 If set to
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 .I yes