summaryrefslogtreecommitdiffstats
path: root/src/librbd/operation/Request.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/librbd/operation/Request.h')
-rw-r--r--src/librbd/operation/Request.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/src/librbd/operation/Request.h b/src/librbd/operation/Request.h
new file mode 100644
index 000000000..e32b49644
--- /dev/null
+++ b/src/librbd/operation/Request.h
@@ -0,0 +1,107 @@
+// -*- 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;
+
+ ceph_assert(can_affect_io());
+ std::scoped_lock locker{image_ctx.owner_lock, image_ctx.image_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