drbd: introduce completion_ref and kref to struct drbd_request
cherry-picked and adapted from drbd 9 devel branch
completion_ref will count pending events necessary for completion.
kref is for destruction.
This only introduces these new members of struct drbd_request,
a followup patch will make actual use of them.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 8536fab..52ad1bf 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -577,6 +577,11 @@
struct bio *master_bio; /* master bio pointer */
unsigned long rq_state; /* see comments above _req_mod() */
unsigned long start_time;
+
+ /* once it hits 0, we may complete the master_bio */
+ atomic_t completion_ref;
+ /* once it hits 0, we may destroy this drbd_request object */
+ struct kref kref;
};
struct drbd_epoch {