[PATCH] device-mapper: Trigger an event when a table is deleted

If anything is waiting on a device's table when the device is removed, we
must first wake it up so it will release its reference.  Otherwise the
table's reference count will not drop to zero and the table will not get
removed.

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

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 200a0688f717c76759c1165cde20652ad14d07f7..54ec737195e00f9043a8db9dbc04aff0df09e40f 100644 (file)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -230,11 +230,20 @@ static int dm_hash_insert(const char *name, const char *uuid, struct mapped_devi
 
 static void __hash_remove(struct hash_cell *hc)
 {
+       struct dm_table *table;
+
        /* remove from the dev hash */
        list_del(&hc->uuid_list);
        list_del(&hc->name_list);
        unregister_with_devfs(hc);
        dm_set_mdptr(hc->md, NULL);
+
+       table = dm_get_table(hc->md);
+       if (table) {
+               dm_table_event(table);
+               dm_table_put(table);
+       }
+
        dm_put(hc->md);
        if (hc->new_map)
                dm_table_put(hc->new_map);