initial code repo

[stor4nfv.git] / src / ceph / src / librbd / operation / Request.h

diff --git a/src/ceph/src/librbd/operation/Request.h b/src/ceph/src/librbd/operation/Request.h
new file mode 100644 (file)
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+++ b/src/ceph/src/librbd/operation/Request.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_OPERATION_REQUEST_H
+#define CEPH_LIBRBD_OPERATION_REQUEST_H
+
+#include "librbd/AsyncRequest.h"
+#include "include/Context.h"
+#include "common/RWLock.h"
+#include "librbd/Utils.h"
+#include "librbd/Journal.h"
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace operation {
+
+template <typename ImageCtxT = ImageCtx>
+class Request : public AsyncRequest<ImageCtxT> {
+public:
+  Request(ImageCtxT &image_ctx, Context *on_finish,
+          uint64_t journal_op_tid = 0);
+
+  void send();
+
+protected:
+  void finish(int r) override;
+  virtual void send_op() = 0;
+
+  virtual bool can_affect_io() const {
+    return false;
+  }
+  virtual journal::Event create_event(uint64_t op_tid) const = 0;
+
+  template <typename T, Context*(T::*MF)(int*)>
+  bool append_op_event(T *request) {
+    ImageCtxT &image_ctx = this->m_image_ctx;
+
+    assert(can_affect_io());
+    RWLock::RLocker owner_locker(image_ctx.owner_lock);
+    RWLock::RLocker snap_locker(image_ctx.snap_lock);
+    if (image_ctx.journal != nullptr) {
+      if (image_ctx.journal->is_journal_replaying()) {
+        Context *ctx = util::create_context_callback<T, MF>(request);
+        replay_op_ready(ctx);
+        return true;
+      } else if (image_ctx.journal->is_journal_appending()) {
+        Context *ctx = util::create_context_callback<T, MF>(request);
+        append_op_event(ctx);
+        return true;
+      }
+    }
+    return false;
+  }
+
+  bool append_op_event();
+
+  // NOTE: temporary until converted to new state machine format
+  Context *create_context_finisher(int r);
+  void finish_and_destroy(int r) override;
+
+private:
+  struct C_AppendOpEvent : public Context {
+    Request *request;
+    Context *on_safe;
+    C_AppendOpEvent(Request *request, Context *on_safe)
+      : request(request), on_safe(on_safe) {
+    }
+    void finish(int r) override {
+      if (r >= 0) {
+        request->m_appended_op_event = true;
+      }
+      on_safe->complete(r);
+    }
+  };
+
+  struct C_CommitOpEvent : public Context {
+    Request *request;
+    int ret_val;
+    C_CommitOpEvent(Request *request, int ret_val)
+      : request(request), ret_val(ret_val) {
+    }
+    void finish(int r) override {
+      request->handle_commit_op_event(r, ret_val);
+      delete request;
+    }
+  };
+
+  uint64_t m_op_tid = 0;
+  bool m_appended_op_event = false;
+  bool m_committed_op_event = false;
+
+  void replay_op_ready(Context *on_safe);
+  void append_op_event(Context *on_safe);
+  void handle_op_event_safe(int r);
+
+  bool commit_op_event(int r);
+  void handle_commit_op_event(int r, int original_ret_val);
+
+};
+
+} // namespace operation
+} // namespace librbd
+
+extern template class librbd::operation::Request<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_OPERATION_REQUEST_H