drbd: validate_req_change_req_state(): Return 0 upon success and an error code otherwise

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

drivers/block/drbd/drbd_receiver.c

@@ -4587,14 +4587,14 @@ validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector,
 	req = find_request(mdev, root, id, sector, missing_ok, func);
 	if (unlikely(!req)) {
 		spin_unlock_irq(&mdev->tconn->req_lock);
-		return false;
+		return -EIO;
 	}
 	__req_mod(req, what, &m);
 	spin_unlock_irq(&mdev->tconn->req_lock);
 
 	if (m.bio)
 		complete_master_bio(mdev, &m);
-	return true;
+	return 0;
 }
 
 static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi)
@@ -4642,7 +4642,7 @@ static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi)
 		return false;
 	}
 
-	return validate_req_change_req_state(mdev, p->block_id, sector,
+	return !validate_req_change_req_state(mdev, p->block_id, sector,
 					      &mdev->write_requests, __func__,
 					      what, false);
 }
@@ -4655,7 +4655,7 @@ static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi)
 	int size = be32_to_cpu(p->blksize);
 	bool missing_ok = tconn->net_conf->wire_protocol == DRBD_PROT_A ||
 			  tconn->net_conf->wire_protocol == DRBD_PROT_B;
-	bool found;
+	int err;
 
 	mdev = vnr_to_mdev(tconn, pi->vnr);
 	if (!mdev)
@@ -4669,10 +4669,10 @@ static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi)
 		return true;
 	}
 
-	found = validate_req_change_req_state(mdev, p->block_id, sector,
+	err = validate_req_change_req_state(mdev, p->block_id, sector,
 					    &mdev->write_requests, __func__,
 					    NEG_ACKED, missing_ok);
-	if (!found) {
+	if (err) {
 		/* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs.
 		   The master bio might already be completed, therefore the
 		   request is no longer in the collision hash. */
@@ -4700,7 +4700,7 @@ static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi)
 	dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n",
 	    (unsigned long long)sector, be32_to_cpu(p->blksize));
 
-	return validate_req_change_req_state(mdev, p->block_id, sector,
+	return !validate_req_change_req_state(mdev, p->block_id, sector,
 					      &mdev->read_requests, __func__,
 					      NEG_ACKED, false);
 }