ceph/src/tools/rbd_ggate/Server.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_RBD_GGATE_SERVER_H
   5 #define CEPH_RBD_GGATE_SERVER_H
   6
   7 #include "include/rbd/librbd.hpp"
   8 #include "include/xlist.h"
   9 #include "common/Cond.h"
  10 #include "common/Mutex.h"
  11 #include "common/Thread.h"
  12
  13 namespace rbd {
  14 namespace ggate {
  15
  16 class Driver;
  17 struct Request;
  18
  19 class Server {
  20 public:
  21   Server(Driver *drv, librbd::Image& image);
  22
  23   void run();
  24
  25 private:
  26   struct IOContext {
  27     xlist<IOContext*>::item item;
  28     Server *server;
  29     Request *req = nullptr;
  30
  31     IOContext(Server *server) : item(this), server(server) {
  32     }
  33   };
  34
  35   class ThreadHelper : public Thread {
  36   public:
  37     typedef void (Server::*entry_func)();
  38
  39     ThreadHelper(Server *server, entry_func func)
  40       : server(server), func(func) {
  41     }
  42
  43   protected:
  44     virtual void* entry() {
  45       (server->*func)();
  46       return nullptr;
  47     }
  48
  49   private:
  50     Server *server;
  51     entry_func func;
  52   };
  53
  54   friend std::ostream &operator<<(std::ostream &os, const IOContext &ctx);
  55
  56   Driver *m_drv;
  57   librbd::Image &m_image;
  58
  59   mutable Mutex m_lock;
  60   Cond m_cond;
  61   bool m_stopping = false;
  62   ThreadHelper m_reader_thread, m_writer_thread;
  63   xlist<IOContext*> m_io_pending;
  64   xlist<IOContext*> m_io_finished;
  65
  66   static void aio_callback(librbd::completion_t cb, void *arg);
  67
  68   int start();
  69   void stop();
  70
  71   void reader_entry();
  72   void writer_entry();
  73
  74   void io_start(IOContext *ctx);
  75   void io_finish(IOContext *ctx);
  76
  77   IOContext *wait_io_finish();
  78   void wait_clean();
  79
  80   void handle_aio(IOContext *ctx, int r);
  81 };
  82
  83 std::ostream &operator<<(std::ostream &os, const Server::IOContext &ctx);
  84
  85 } // namespace ggate
  86 } // namespace rbd
  87
  88 #endif // CEPH_RBD_GGATE_SERVER_H