drbd: let drbd_free_ee implicitly free any digest

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

drivers/block/drbd/drbd_int.h

@@ -796,12 +796,16 @@ enum {
 	 * if any of those fail, we set this flag atomically
 	 * from the endio callback */
 	__EE_WAS_ERROR,
+
+	/* This ee has a pointer to a digest instead of a block id */
+	__EE_HAS_DIGEST,
 };
 #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO)
 #define EE_MAY_SET_IN_SYNC     (1<<__EE_MAY_SET_IN_SYNC)
 #define EE_IS_BARRIER          (1<<__EE_IS_BARRIER)
 #define	EE_RESUBMITTED         (1<<__EE_RESUBMITTED)
 #define EE_WAS_ERROR           (1<<__EE_WAS_ERROR)
+#define EE_HAS_DIGEST          (1<<__EE_HAS_DIGEST)
 
 /* global flag bits */
 enum {

drivers/block/drbd/drbd_receiver.c

@@ -377,6 +377,8 @@ struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev,
 
 void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
 {
+	if (e->flags & EE_HAS_DIGEST)
+		kfree(e->digest);
 	drbd_pp_free(mdev, e->pages);
 	D_ASSERT(atomic_read(&e->pending_bios) == 0);
 	D_ASSERT(hlist_unhashed(&e->colision));
@@ -2094,10 +2096,12 @@ static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h)
 		di->digest_size = digest_size;
 		di->digest = (((char *)di)+sizeof(struct digest_info));
 
+		e->digest = di;
+		e->flags |= EE_HAS_DIGEST;
+
 		if (drbd_recv(mdev, di->digest, digest_size) != digest_size)
 			goto out_free_e;
 
-		e->digest = di;
 		if (h->command == P_CSUM_RS_REQUEST) {
 			D_ASSERT(mdev->agreed_pro_version >= 89);
 			e->w.cb = w_e_end_csum_rs_req;
@@ -2159,7 +2163,6 @@ static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h)
 		return TRUE;
 
 out_free_e:
-	kfree(di);
 	put_ldev(mdev);
 	drbd_free_ee(mdev, e);
 	return FALSE;

drivers/block/drbd/drbd_worker.c

@@ -1052,9 +1052,6 @@ int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
 	}
 
 	dec_unacked(mdev);
-
-	kfree(di);
-
 	move_to_net_ee_or_free(mdev, e);
 
 	if (unlikely(!ok))
@@ -1145,9 +1142,6 @@ int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
 	}
 
 	dec_unacked(mdev);
-
-	kfree(di);
-
 	if (!eq)
 		drbd_ov_oos_found(mdev, e->sector, e->size);
 	else