drbd: Use and idr data structure to map volume numbers to mdev pointers

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index ddd2ed7dec1c..8d32f9dc18ed 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -40,6 +40,7 @@
 #include <linux/major.h>
 #include <linux/blkdev.h>
 #include <linux/genhd.h>
+#include <linux/idr.h>
 #include <net/tcp.h>
 #include <linux/lru_cache.h>
 #include <linux/prefetch.h>
@@ -916,8 +917,9 @@ struct drbd_tconn {			/* is a resource from the config file */
         char *name;                     /* Resource name */
         struct list_head all_tconn;     /* List of all drbd_tconn, prot by global_state_lock */
         struct drbd_conf *volume0;      /* TODO: Remove me again */
-        unsigned long flags;
+        struct idr volumes;             /* <tconn, vnr> to mdev mapping */
 
+        unsigned long flags;
         struct net_conf *net_conf;      /* protected by get_net_conf() and put_net_conf() */
         atomic_t net_cnt;               /* Users of net_conf */
         wait_queue_head_t net_cnt_wait;