[dm-devel] [PATCH V3 18/18] multipath: make path devices readonly again.

[Benjamin Marzinski]

Path device fds were changed to be opened read/write when the
mpathpersist code was added. However, I have talked with Vijay, and
this doesn't appear to be necessary for mpathpersist to work correctly.
If the path fds are opened read/write, when the are closed a change
uevent is triggered, which was causing problems during shutdown with
LVM on top of multipath devices. This patch reverts them to being read-only
again.

Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
---
 libmultipath/discovery.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 831cfef..8b6f74d 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -886,7 +886,7 @@ pathinfo (struct path *pp, vector hwtable, int mask)
 	 * fetch info not available through sysfs
 	 */
 	if (pp->fd < 0)
-		pp->fd = open(udev_device_get_devnode(pp->udev), O_RDWR);
+		pp->fd = open(udev_device_get_devnode(pp->udev), O_RDONLY);
 
 	if (pp->fd < 0) {
 		condlog(4, "Couldn't open node for %s: %s",
-- 
1.8.0