From: "goggin, edward" <egoggin@emc.com>

After changing the name of a mapped device, trigger a dm event.  (For
userspace multipath tools.)

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/md/dm-ioctl.c |   10 ++++++++++
 1 files changed, 10 insertions(+)

diff -puN drivers/md/dm-ioctl.c~device-mapper-ioctl-event-on-rename drivers/md/dm-ioctl.c
--- devel/drivers/md/dm-ioctl.c~device-mapper-ioctl-event-on-rename	2005-11-18 18:16:09.000000000 -0800
+++ devel-akpm/drivers/md/dm-ioctl.c	2005-11-18 18:16:09.000000000 -0800
@@ -270,6 +270,7 @@ static int dm_hash_rename(const char *ol
 {
 	char *new_name, *old_name;
 	struct hash_cell *hc;
+	struct dm_table *table;
 
 	/*
 	 * duplicate new.
@@ -317,6 +318,15 @@ static int dm_hash_rename(const char *ol
 	/* rename the device node in devfs */
 	register_with_devfs(hc);
 
+	/*
+	 * Wake up any dm event waiters.
+	 */
+	table = dm_get_table(hc->md);
+	if (table) {
+		dm_table_event(table);
+		dm_table_put(table);
+	}
+
 	up_write(&_hash_lock);
 	kfree(old_name);
 	return 0;
_