From 9e51c639502eff048d0606fd5aa49cae7619822d Mon Sep 17 00:00:00 2001
From: Sage Weil <sage.weil@dreamhost.com>
Date: Thu, 1 Dec 2011 20:55:05 -0800
Subject: [PATCH] osd: MOSDPGScan

Message to query hash ranges of a PG.

Signed-off-by: Sage Weil <sage@newdream.net>
---
 src/Makefile.am           |  1 +
 src/messages/MOSDPGScan.h | 81 +++++++++++++++++++++++++++++++++++++++
 src/msg/Message.cc        |  4 ++
 src/msg/Message.h         |  1 +
 4 files changed, 87 insertions(+)
 create mode 100644 src/messages/MOSDPGScan.h

diff --git a/src/Makefile.am b/src/Makefile.am
index 255c1f87626c0..b604fa365986c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1321,6 +1321,7 @@ noinst_HEADERS = \
         messages/MOSDPGNotify.h\
         messages/MOSDPGQuery.h\
         messages/MOSDPGRemove.h\
+	messages/MOSDPGScan.h\
         messages/MOSDPGTemp.h\
         messages/MOSDPGTrim.h\
         messages/MOSDPing.h\
diff --git a/src/messages/MOSDPGScan.h b/src/messages/MOSDPGScan.h
new file mode 100644
index 0000000000000..cc8df296d9dfa
--- /dev/null
+++ b/src/messages/MOSDPGScan.h
@@ -0,0 +1,81 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MOSDPGSCAN_H
+#define CEPH_MOSDPGSCAN_H
+
+#include "msg/Message.h"
+#include "osd/osd_types.h"
+
+class MOSDPGScan : public Message {
+public:
+  enum {
+    OP_SCAN_GET_DIGEST = 1,      // just objects and versions
+    OP_SCAN_DIGEST = 2,          // result
+  };
+  const char *get_op_name(int o) {
+    switch (o) {
+    case OP_SCAN_GET_DIGEST: return "get_digest";
+    case OP_SCAN_DIGEST: return "digest";
+    default: return "???";
+    }
+  }
+
+  __u32 op;
+  epoch_t map_epoch, query_epoch;
+  pg_t pgid;
+  hobject_t begin, end;
+
+  virtual void decode_payload(CephContext *cct) {
+    bufferlist::iterator p = payload.begin();
+    ::decode(op, p);
+    ::decode(map_epoch, p);
+    ::decode(query_epoch, p);
+    ::decode(pgid, p);
+    ::decode(begin, p);
+    ::decode(end, p);
+  }
+
+  virtual void encode_payload(CephContext *cct) {
+    ::encode(op, payload);
+    ::encode(map_epoch, payload);
+    ::encode(query_epoch, payload);
+    ::encode(pgid, payload);
+    ::encode(begin, payload);
+    ::encode(end, payload);
+  }
+
+  MOSDPGScan() : Message(MSG_OSD_PG_SCAN) {}
+  MOSDPGScan(__u32 o, epoch_t e, epoch_t qe, pg_t p, hobject_t be, hobject_t en)
+    : Message(MSG_OSD_PG_SCAN),
+      op(o),
+      map_epoch(e), query_epoch(e),
+      pgid(p),
+      begin(be), end(en) {
+  }
+private:
+  ~MOSDPGScan() {}
+
+public:
+  const char *get_type_name() { return "pg_scan"; }
+  void print(ostream& out) {
+    out << "pg_scan(" << get_op_name(op)
+	<< " " << pgid
+	<< " " << begin << "-" << end
+	<< " e " << map_epoch << "/" << query_epoch
+	<< ")";
+  }
+};
+
+#endif
diff --git a/src/msg/Message.cc b/src/msg/Message.cc
index 284f7529a8102..cfdafdffc4058 100644
--- a/src/msg/Message.cc
+++ b/src/msg/Message.cc
@@ -65,6 +65,7 @@ using namespace std;
 #include "messages/MOSDPGMissing.h"
 #include "messages/MOSDScrub.h"
 #include "messages/MOSDRepScrub.h"
+#include "messages/MOSDPGScan.h"
 
 #include "messages/MRemoveSnaps.h"
 
@@ -353,6 +354,9 @@ Message *decode_message(CephContext *cct, ceph_msg_header& header, ceph_msg_foot
   case MSG_OSD_REP_SCRUB:
     m = new MOSDRepScrub;
     break;
+  case MSG_OSD_PG_SCAN:
+    m = new MOSDPGScan;
+    break;
    // auth
   case CEPH_MSG_AUTH:
     m = new MAuth;
diff --git a/src/msg/Message.h b/src/msg/Message.h
index 389220e98cfa0..ac31e4bf915b9 100644
--- a/src/msg/Message.h
+++ b/src/msg/Message.h
@@ -78,6 +78,7 @@
 #define MSG_OSD_PG_MISSING     92
 #define MSG_OSD_REP_SCRUB      93
 
+#define MSG_OSD_PG_SCAN        94
 
 #define MSG_COMMAND            97
 #define MSG_COMMAND_REPLY      98
-- 
2.39.5