drbd: conflicting writes: make wake_up of waiting peer_requests explicit

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_req.c b/drivers/block/drbd/drbd_req.c
index 938a57b..c0326f5 100644 (file)
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -212,6 +212,16 @@ static void drbd_remove_request_interval(struct rb_root *root,
                wake_up(&mdev->misc_wait);
 }
 
+static void maybe_wakeup_conflicting_requests(struct drbd_request *req)
+{
+       const unsigned long s = req->rq_state;
+       if (s & RQ_LOCAL_PENDING && !(s & RQ_LOCAL_ABORTED))
+               return;
+       if (req->i.waiting)
+               /* Retry all conflicting peer requests.  */
+               wake_up(&req->w.mdev->misc_wait);
+}
+
 /* Helper for __req_mod().
  * Set m->bio to the master bio, if it is fit to be completed,
  * or leave it alone (it is initialized to NULL in __req_mod),
@@ -235,10 +245,6 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
         */
        if (s & RQ_LOCAL_PENDING && !(s & RQ_LOCAL_ABORTED))
                return;
-       if (req->i.waiting) {
-               /* Retry all conflicting peer requests.  */
-               wake_up(&mdev->misc_wait);
-       }
        if (s & RQ_NET_QUEUED)
                return;
        if (s & RQ_NET_PENDING)
@@ -388,6 +394,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
                req->rq_state |= (RQ_LOCAL_COMPLETED|RQ_LOCAL_OK);
                req->rq_state &= ~RQ_LOCAL_PENDING;
 
+               maybe_wakeup_conflicting_requests(req);
                _req_may_be_done_not_susp(req, m);
                put_ldev(mdev);
                break;
@@ -405,6 +412,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
                req->rq_state &= ~RQ_LOCAL_PENDING;
 
                __drbd_chk_io_error(mdev, false);
+               maybe_wakeup_conflicting_requests(req);
                _req_may_be_done_not_susp(req, m);
                put_ldev(mdev);
                break;
@@ -615,6 +623,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
                dec_ap_pending(mdev);
                atomic_sub(req->i.size >> 9, &mdev->ap_in_flight);
                req->rq_state &= ~RQ_NET_PENDING;
+               maybe_wakeup_conflicting_requests(req);
                _req_may_be_done_not_susp(req, m);
                break;
 
@@ -626,6 +635,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
                 */
                D_ASSERT(req->rq_state & RQ_NET_PENDING);
                req->rq_state |= RQ_POSTPONED;
+               maybe_wakeup_conflicting_requests(req);
                _req_may_be_done_not_susp(req, m);
                break;
 
@@ -643,6 +653,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
                if (!(req->rq_state & RQ_WRITE))
                        goto goto_read_retry_local;
 
+               maybe_wakeup_conflicting_requests(req);
                _req_may_be_done_not_susp(req, m);
                /* else: done by HANDED_OVER_TO_NETWORK */
                break;