drbd: Do not log an ASSERT for P_OV_REQUEST packets while C_CONNECTED

This might happen if on the VERIFY_S node the disk gets dropped.
Although this is an cluster wide state transition, the VERIFY_T node,
updates it connection state first. Then the ack packet for the
cluster wide state transition travels back, and the VERIFY_S node
stops to produce the P_OV_REQUEST packets.

There is absolutely nothing wrong with that.

Further, do not log "Can not satisfy peer's..." on the VERIFY_S
node in this case, but pretend that they had equal checksum.

[Bugz 327]

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

1 files changed, 22 insertions, 8 deletions

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 71775a9de21d..4dc6a8870526 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2079,7 +2079,7 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, un
         const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
         struct drbd_epoch_entry *e;
         struct digest_info *di = NULL;
-        int size;
+        int size, verb;
         unsigned int fault_type;
         struct p_block_req *p = &mdev->data.rbuf.block_req;
 
@@ -2098,11 +2098,29 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, un
         }
 
         if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) {
-                if (__ratelimit(&drbd_ratelimit_state))
+                verb = 1;
+                switch (cmd) {
+                case P_DATA_REQUEST:
+                        drbd_send_ack_rp(mdev, P_NEG_DREPLY, p);
+                        break;
+                case P_RS_DATA_REQUEST:
+                case P_CSUM_RS_REQUEST:
+                case P_OV_REQUEST:
+                        drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p);
+                        break;
+                case P_OV_REPLY:
+                        verb = 0;
+                        dec_rs_pending(mdev);
+                        drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC);
+                        break;
+                default:
+                        dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
+                                cmdname(cmd));
+                }
+                if (verb && __ratelimit(&drbd_ratelimit_state))
                         dev_err(DEV, "Can not satisfy peer's read request, "
                             "no local data.\n");
-                drbd_send_ack_rp(mdev, cmd == P_DATA_REQUEST ? P_NEG_DREPLY :
-                                 P_NEG_RS_DREPLY , p);
+
                 /* drain possibly payload */
                 return drbd_drain_block(mdev, digest_size);
         }
@@ -2157,10 +2175,6 @@ static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, un
                 break;
 
         case P_OV_REQUEST:
-                if (mdev->state.conn >= C_CONNECTED &&
-                    mdev->state.conn != C_VERIFY_T)
-                        dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n",
-                                drbd_conn_str(mdev->state.conn));
                 if (mdev->ov_start_sector == ~(sector_t)0 &&
                     mdev->agreed_pro_version >= 90) {
                         mdev->ov_start_sector = sector;