drbd: Update some outdated comments to match the code

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

drivers/block/drbd/drbd_bitmap.c

@@ -389,8 +389,8 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want)
 
 	/* Trying kmalloc first, falling back to vmalloc.
 	 * GFP_KERNEL is ok, as this is done when a lower level disk is
-	 * "attached" to the drbd.  Context is receiver thread or cqueue
-	 * thread.  As we have no disk yet, we are not in the IO path,
+	 * "attached" to the drbd.  Context is receiver thread or drbdsetup /
+	 * netlink process.  As we have no disk yet, we are not in the IO path,
 	 * not even the IO path of the peer. */
 	bytes = sizeof(struct page *)*want;
 	new_pages = kmalloc(bytes, GFP_KERNEL);

drivers/block/drbd/drbd_nl.c

@@ -2038,7 +2038,7 @@ int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
 		goto fail;
 	}
 
-	/* allocation not in the IO path, cqueue thread context */
+	/* allocation not in the IO path, drbdsetup / netlink process context */
 	new_conf = kzalloc(sizeof(*new_conf), GFP_KERNEL);
 	if (!new_conf) {
 		retcode = ERR_NOMEM;

drivers/block/drbd/drbd_req.c

@@ -292,13 +292,12 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
 
 	if ((s & RQ_NET_MASK) == 0 || (s & RQ_NET_DONE)) {
 		/* this is disconnected (local only) operation,
-		 * or protocol C P_WRITE_ACK,
-		 * or protocol A or B P_BARRIER_ACK,
+		 * or protocol A, B, or C P_BARRIER_ACK,
 		 * or killed from the transfer log due to connection loss. */
 		_req_is_done(mdev, req, rw);
 	}
 	/* else: network part and not DONE yet. that is
-	 * protocol A or B, barrier ack still pending... */
+	 * protocol A, B, or C, barrier ack still pending... */
 }
 
 static void _req_may_be_done_not_susp(struct drbd_request *req, struct bio_and_error *m)
@@ -668,7 +667,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
 			break;
 
 		if (req->rq_state & RQ_NET_PENDING) {
-			/* barrier came in before all requests have been acked.
+			/* barrier came in before all requests were acked.
 			 * this is bad, because if the connection is lost now,
 			 * we won't be able to clean them up... */
 			dev_err(DEV, "FIXME (BARRIER_ACKED but pending)\n");

drivers/block/drbd/drbd_worker.c

@@ -969,7 +969,7 @@ int w_e_end_data_req(struct drbd_work *w, int cancel)
 }
 
 /**
- * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS
+ * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUEST
  * @mdev:	DRBD device.
  * @w:		work object.
  * @cancel:	The connection will be closed anyways