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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>
This commit is contained in:
Lars Ellenberg 2012-03-26 16:55:46 +02:00 committed by Philipp Reisner
parent 0afd569a40
commit 8d6cdd7848
1 changed files with 15 additions and 4 deletions
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19
drivers/block/drbd/drbd_req.c
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@ -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;