ceph/src/librbd/object_map/ResizeRequest.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 "librbd/object_map/ResizeRequest.h"
   5 #include "common/dout.h"
   6 #include "common/errno.h"
   7 #include "librbd/ImageCtx.h"
   8 #include "librbd/ObjectMap.h"
   9 #include "cls/lock/cls_lock_client.h"
  10
  11 #define dout_subsys ceph_subsys_rbd
  12 #undef dout_prefix
  13 #define dout_prefix *_dout << "librbd::object_map::ResizeRequest: "
  14
  15 namespace librbd {
  16 namespace object_map {
  17
  18 void ResizeRequest::resize(ceph::BitVector<2> *object_map, uint64_t num_objs,
  19                            uint8_t default_state) {
  20   size_t orig_object_map_size = object_map->size();
  21   object_map->resize(num_objs);
  22   for (uint64_t i = orig_object_map_size; i < object_map->size(); ++i) {
  23     (*object_map)[i] = default_state;
  24   }
  25 }
  26
  27 void ResizeRequest::send() {
  28   CephContext *cct = m_image_ctx.cct;
  29
  30   RWLock::WLocker l(m_image_ctx.object_map_lock);
  31   m_num_objs = Striper::get_num_objects(m_image_ctx.layout, m_new_size);
  32
  33   std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
  34   ldout(cct, 5) << this << " resizing on-disk object map: "
  35                 << "ictx=" << &m_image_ctx << ", "
  36                 << "oid=" << oid << ", num_objs=" << m_num_objs << dendl;
  37
  38   librados::ObjectWriteOperation op;
  39   if (m_snap_id == CEPH_NOSNAP) {
  40     rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "");
  41   }
  42   cls_client::object_map_resize(&op, m_num_objs, m_default_object_state);
  43
  44   librados::AioCompletion *rados_completion = create_callback_completion();
  45   int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
  46   assert(r == 0);
  47   rados_completion->release();
  48 }
  49
  50 void ResizeRequest::finish_request() {
  51   RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
  52
  53   CephContext *cct = m_image_ctx.cct;
  54   ldout(cct, 5) << this << " resizing in-memory object map: "
  55                 << m_num_objs << dendl;
  56
  57   resize(m_object_map, m_num_objs, m_default_object_state);
  58 }
  59
  60 } // namespace object_map
  61 } // namespace librbd