multipath: make path devices readonly again.

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@redhat.com>

diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 831cfef..8b6f74d 100644 (file)
--- 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",