initial code repo

[stor4nfv.git] / src / ceph / src / librbd / managed_lock / AcquireRequest.h

diff --git a/src/ceph/src/librbd/managed_lock/AcquireRequest.h b/src/ceph/src/librbd/managed_lock/AcquireRequest.h
new file mode 100644 (file)
index 0000000..20af069
--- /dev/null
+++ b/src/ceph/src/librbd/managed_lock/AcquireRequest.h
@@ -0,0 +1,101 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_MANAGED_LOCK_ACQUIRE_REQUEST_H
+#define CEPH_LIBRBD_MANAGED_LOCK_ACQUIRE_REQUEST_H
+
+#include "include/rados/librados.hpp"
+#include "include/int_types.h"
+#include "include/buffer.h"
+#include "msg/msg_types.h"
+#include "librbd/managed_lock/Types.h"
+#include "librbd/watcher/Types.h"
+#include <string>
+
+class Context;
+class ContextWQ;
+
+namespace librbd {
+
+class Watcher;
+
+namespace managed_lock {
+
+template <typename ImageCtxT>
+class AcquireRequest {
+private:
+  typedef watcher::Traits<ImageCtxT> TypeTraits;
+  typedef typename TypeTraits::Watcher Watcher;
+
+public:
+  static AcquireRequest* create(librados::IoCtx& ioctx, Watcher *watcher,
+                                ContextWQ *work_queue, const std::string& oid,
+                                const std::string& cookie,
+                                bool exclusive,
+                                bool blacklist_on_break_lock,
+                                uint32_t blacklist_expire_seconds,
+                                Context *on_finish);
+
+  ~AcquireRequest();
+  void send();
+
+private:
+
+  /**
+   * @verbatim
+   *
+   * <start>
+   *    |
+   *    v
+   * GET_LOCKER
+   *    |     ^
+   *    |     . (EBUSY && no cached locker)
+   *    |     .
+   *    |     .          (EBUSY && cached locker)
+   *    \--> LOCK_IMAGE * * * * * * * * > BREAK_LOCK . . . . .
+   *            |   ^                         |              .
+   *            |   |                         | (success)    .
+   *            |   \-------------------------/              .
+   *            v                                            .
+   *         <finish>  < . . . . . . . . . . . . . . . . . . .
+   *
+   * @endverbatim
+   */
+
+  AcquireRequest(librados::IoCtx& ioctx, Watcher *watcher,
+                 ContextWQ *work_queue, const std::string& oid,
+                 const std::string& cookie, bool exclusive,
+                 bool blacklist_on_break_lock,
+                 uint32_t blacklist_expire_seconds, Context *on_finish);
+
+  librados::IoCtx& m_ioctx;
+  Watcher *m_watcher;
+  CephContext *m_cct;
+  ContextWQ *m_work_queue;
+  std::string m_oid;
+  std::string m_cookie;
+  bool m_exclusive;
+  bool m_blacklist_on_break_lock;
+  uint32_t m_blacklist_expire_seconds;
+  Context *m_on_finish;
+
+  bufferlist m_out_bl;
+
+  Locker m_locker;
+
+  void send_get_locker();
+  void handle_get_locker(int r);
+
+  void send_lock();
+  void handle_lock(int r);
+
+  void send_break_lock();
+  void handle_break_lock(int r);
+
+  void finish(int r);
+};
+
+} // namespace managed_lock
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_MANAGED_LOCK_ACQUIRE_REQUEST_H