drbd: Reinstate disabling AL updates with invalidate-remote

Commit d0ef827e (drbd: switch configuration interface from connector to
genetlink) introduced a regression by removing the ability to set all
bits in the out of sync bitmap and to suspend updates to the activity log
of a disconnected device via the invalidate-remote management call.

Credits for reporting the issue are going to Arne Redlich.

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_nl.c b/drivers/block/drbd/drbd_nl.c
index b369dd1..c5aa084 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -2410,9 +2410,47 @@ out:
        return 0;
 }
 
+static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
+{
+       int rv;
+
+       rv = drbd_bmio_set_n_write(mdev);
+       drbd_suspend_al(mdev);
+       return rv;
+}
+
 int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
 {
-       return drbd_adm_simple_request_state(skb, info, NS(conn, C_STARTING_SYNC_S));
+       int retcode; /* drbd_ret_code, drbd_state_rv */
+       struct drbd_conf *mdev;
+
+       retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
+       if (!adm_ctx.reply_skb)
+               return retcode;
+       if (retcode != NO_ERROR)
+               goto out;
+
+       mdev = adm_ctx.mdev;
+
+       retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
+       if (retcode < SS_SUCCESS) {
+               if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
+                       /* The peer will get a resync upon connect anyways.
+                        * Just make that into a full resync. */
+                       retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
+                       if (retcode >= SS_SUCCESS) {
+                               if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
+                                                  "set_n_write from invalidate_peer",
+                                                  BM_LOCKED_SET_ALLOWED))
+                                       retcode = ERR_IO_MD_DISK;
+                       }
+               } else
+                       retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
+       }
+
+out:
+       drbd_adm_finish(info, retcode);
+       return 0;
 }
 
 int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)

diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index 05ed131..c0563a1 100644 (file)
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -628,6 +628,11 @@ is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc)
        if (oc == C_STANDALONE && nc != C_UNCONNECTED)
                return SS_NEED_CONNECTION;
 
+       /* When establishing a connection we need to go through WF_REPORT_PARAMS!
+          Necessary to do the right thing upon invalidate-remote on a disconnected resource */
+       if (oc < C_WF_REPORT_PARAMS && nc >= C_CONNECTED)
+               return SS_NEED_CONNECTION;
+
        /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */
        if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING)
                return SS_IN_TRANSIENT_STATE;