[PATCH 33/39] mds: notify bystanders if export aborts

["Yan, Zheng" <zheng.z.yan@xxxxxxxxx>]

From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>

So bystanders know the subtree is single auth earlier.

Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
---
 src/mds/Migrator.cc | 34 ++++++++++++++++++++++++++--------
 src/mds/Migrator.h  |  1 +
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/src/mds/Migrator.cc b/src/mds/Migrator.cc
index 40a5394..0672d03 100644
--- a/src/mds/Migrator.cc
+++ b/src/mds/Migrator.cc
@@ -251,25 +251,28 @@ void Migrator::handle_mds_failure_or_stop(int who)
 	  mds->send_message_mds(new MExportDirCancel(dir->dirfrag()), export_peer[dir]);
 	break;
 
-	// NOTE: state order reversal, warning comes after loggingstart+prepping
+	// NOTE: state order reversal, warning comes after prepping
       case EXPORT_WARNING:
 	dout(10) << "export state=warning : unpinning bounds, unfreezing, notifying" << dendl;
 	// fall-thru
 
       case EXPORT_PREPPING:
 	if (p->second != EXPORT_WARNING) 
-	  dout(10) << "export state=loggingstart|prepping : unpinning bounds, unfreezing" << dendl;
+	  dout(10) << "export state=prepping : unpinning bounds, unfreezing" << dendl;
 	{
 	  // unpin bounds
 	  set<CDir*> bounds;
 	  cache->get_subtree_bounds(dir, bounds);
-	  for (set<CDir*>::iterator p = bounds.begin();
-	       p != bounds.end();
-	       ++p) {
-	    CDir *bd = *p;
+	  for (set<CDir*>::iterator q = bounds.begin();
+	       q != bounds.end();
+	       ++q) {
+	    CDir *bd = *q;
 	    bd->put(CDir::PIN_EXPORTBOUND);
 	    bd->state_clear(CDir::STATE_EXPORTBOUND);
 	  }
+	  // notify bystanders
+	  if (p->second == EXPORT_WARNING)
+	    export_notify_abort(dir, bounds);
 	}
 	dir->unfreeze_tree();
 	export_state.erase(dir); // clean up
@@ -1307,9 +1310,21 @@ void Migrator::handle_export_ack(MExportDirAck *m)
   m->put();
 }
 
+void Migrator::export_notify_abort(CDir *dir, set<CDir*>& bounds)
+{
+  dout(7) << "export_notify_abort " << *dir << dendl;
 
-
-
+  for (set<int>::iterator p = export_notify_ack_waiting[dir].begin();
+       p != export_notify_ack_waiting[dir].end();
+       ++p) {
+    MExportDirNotify *notify = new MExportDirNotify(dir->dirfrag(), false,
+						    pair<int,int>(mds->get_nodeid(),export_peer[dir]),
+						    pair<int,int>(mds->get_nodeid(),CDIR_AUTH_UNKNOWN));
+    for (set<CDir*>::iterator i = bounds.begin(); i != bounds.end(); ++i)
+      notify->get_bounds().push_back((*i)->dirfrag());
+    mds->send_message_mds(notify, *p);
+  }
+}
 
 /*
  * this happens if hte dest failes after i send teh export data but before it is acked
@@ -1356,6 +1371,9 @@ void Migrator::export_reverse(CDir *dir)
     bd->state_clear(CDir::STATE_EXPORTBOUND);
   }
 
+  // notify bystanders
+  export_notify_abort(dir, bounds);
+
   // process delayed expires
   cache->process_delayed_expire(dir);
   
diff --git a/src/mds/Migrator.h b/src/mds/Migrator.h
index 2889a74..f395bc1 100644
--- a/src/mds/Migrator.h
+++ b/src/mds/Migrator.h
@@ -227,6 +227,7 @@ public:
   void export_go(CDir *dir);
   void export_go_synced(CDir *dir);
   void export_reverse(CDir *dir);
+  void export_notify_abort(CDir *dir, set<CDir*>& bounds);
   void handle_export_ack(MExportDirAck *m);
   void export_logged_finish(CDir *dir);
   void handle_export_notify_ack(MExportDirNotifyAck *m);
-- 
1.7.11.7

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