drbd: fix hang on local read errors while disconnected

[safe/jmp/linux-2.6] / drivers / block / drbd / drbd_req.c

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index e6c4d57..8915644 100644 (file)
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -452,20 +452,21 @@ void __req_mod(struct drbd_request *req, enum drbd_req_event what,
 
                dev_alert(DEV, "Local READ failed sec=%llus size=%u\n",
                      (unsigned long long)req->sector, req->size);
-               /* _req_mod(req,to_be_send); oops, recursion... */
                D_ASSERT(!(req->rq_state & RQ_NET_MASK));
-               req->rq_state |= RQ_NET_PENDING;
-               inc_ap_pending(mdev);
 
                __drbd_chk_io_error(mdev, FALSE);
                put_ldev(mdev);
-               /* NOTE: if we have no connection,
-                * or know the peer has no good data either,
-                * then we don't actually need to "queue_for_net_read",
-                * but we do so anyways, since the drbd_io_error()
-                * and the potential state change to "Diskless"
-                * needs to be done from process context */
 
+               /* no point in retrying if there is no good remote data,
+                * or we have no connection. */
+               if (mdev->state.pdsk != D_UP_TO_DATE) {
+                       _req_may_be_done(req, m);
+                       break;
+               }
+
+               /* _req_mod(req,to_be_send); oops, recursion... */
+               req->rq_state |= RQ_NET_PENDING;
+               inc_ap_pending(mdev);
                /* fall through: _req_mod(req,queue_for_net_read); */
 
        case queue_for_net_read:
@@ -575,6 +576,9 @@ void __req_mod(struct drbd_request *req, enum drbd_req_event what,
                _req_may_be_done(req, m);
                break;
 
+       case read_retry_remote_canceled:
+               req->rq_state &= ~RQ_NET_QUEUED;
+               /* fall through, in case we raced with drbd_disconnect */
        case connection_lost_while_pending:
                /* transfer log cleanup after connection loss */
                /* assert something? */