ceph/src/tools/rbd_ggate/Watcher.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "common/debug.h"
   5 #include "common/errno.h"
   6 #include "Driver.h"
   7 #include "Watcher.h"
   8
   9 #define dout_context g_ceph_context
  10 #define dout_subsys ceph_subsys_rbd
  11 #undef dout_prefix
  12 #define dout_prefix *_dout << "rbd::ggate::Watcher: " << this \
  13                            << " " << __func__ << ": "
  14
  15 namespace rbd {
  16 namespace ggate {
  17
  18 Watcher::Watcher(Driver *drv, librados::IoCtx &ioctx, librbd::Image &image,
  19                  size_t size)
  20   : m_drv(drv), m_ioctx(ioctx), m_image(image), m_size(size) {
  21 }
  22
  23 void Watcher::handle_notify() {
  24   dout(20) << dendl;
  25
  26   librbd::image_info_t info;
  27
  28   if (m_image.stat(info, sizeof(info)) == 0) {
  29     size_t new_size = info.size;
  30
  31     if (new_size != m_size) {
  32       int r = m_drv->resize(new_size);
  33       if (r < 0) {
  34         derr << "resize failed: " << cpp_strerror(r) << dendl;
  35         m_drv->shut_down();
  36       }
  37       r = m_image.invalidate_cache();
  38       if (r < 0) {
  39         derr << "invalidate rbd cache failed: " << cpp_strerror(r) << dendl;
  40         m_drv->shut_down();
  41       }
  42       m_size = new_size;
  43     }
  44   }
  45 }
  46
  47 } // namespace ggate
  48 } // namespace rbd