[dm-devel] [PATCH] multipathd: fix missing persistent reseravtion for active path

[lixiaokeng]

There are two paths(sucu as sda and adb) for one LUN. The two
paths log in, but before the two uevents have been processed
(for example there are many uevent), users use multipathd add
path /dev/sda to cause mpatha and use mpathpersist -o -I to
register prkey for mpatha. The add map uevent is after add path
uevent, the the uevent(add sdb) will delay and missing persistent
reseravtion check.

Here, we add persistent reseravtion check in ev_add_map if
mpp->wait_for_udev > 1.

Signed-off-by: Lixiaokeng <lixiaokeng at huawei.com>
---
 multipathd/main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/multipathd/main.c b/multipathd/main.c
index 3aff241d..ef456c34 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -706,6 +706,8 @@ ev_add_map (char * dev, const char * alias, struct vectors * vecs)
 	struct multipath * mpp;
 	int delayed_reconfig, reassign_maps;
 	struct config *conf;
+	struct path *pp;
+	int i;

 	if (dm_is_mpath(alias) != 1) {
 		condlog(4, "%s: not a multipath map", alias);
@@ -721,6 +723,13 @@ ev_add_map (char * dev, const char * alias, struct vectors * vecs)
 			if (update_map(mpp, vecs, 0))
 				/* setup multipathd removed the map */
 				return 1;
+
+			vector_foreach_slot(mpp->paths, pp, i) {
+				if ((pp->state == PATH_UP)  || (pp->state == PATH_GHOST)) {
+					/* persistent reseravtion check*/
+					mpath_pr_event_handle(pp);
+				}
+			}
 		}
 		conf = get_multipath_config();
 		delayed_reconfig = conf->delayed_reconfig;
--