ceph/src/librbd/journal/CreateRequest.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/dout.h"
   5 #include "common/errno.h"
   6 #include "include/ceph_assert.h"
   7 #include "librbd/Utils.h"
   8 #include "common/Timer.h"
   9 #include "common/WorkQueue.h"
  10 #include "journal/Settings.h"
  11 #include "librbd/journal/CreateRequest.h"
  12 #include "librbd/journal/RemoveRequest.h"
  13
  14 #define dout_subsys ceph_subsys_rbd
  15 #undef dout_prefix
  16 #define dout_prefix *_dout << "librbd::Journal::CreateRequest: "
  17
  18 namespace librbd {
  19
  20 using util::create_context_callback;
  21
  22 namespace journal {
  23
  24 template<typename I>
  25 CreateRequest<I>::CreateRequest(IoCtx &ioctx, const std::string &imageid,
  26                                 uint8_t order, uint8_t splay_width,
  27                                 const std::string &object_pool,
  28                                 uint64_t tag_class, TagData &tag_data,
  29                                 const std::string &client_id,
  30                                 ContextWQ *op_work_queue,
  31                                 Context *on_finish)
  32   : m_ioctx(ioctx), m_image_id(imageid), m_order(order),
  33     m_splay_width(splay_width), m_object_pool(object_pool),
  34     m_tag_class(tag_class), m_tag_data(tag_data), m_image_client_id(client_id),
  35     m_op_work_queue(op_work_queue), m_on_finish(on_finish) {
  36   m_cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
  37 }
  38
  39 template<typename I>
  40 void CreateRequest<I>::send() {
  41   ldout(m_cct, 20) << this << " " << __func__ << dendl;
  42
  43   if (m_order > 64 || m_order < 12) {
  44     lderr(m_cct) << "order must be in the range [12, 64]" << dendl;
  45     complete(-EDOM);
  46     return;
  47   }
  48   if (m_splay_width == 0) {
  49     complete(-EINVAL);
  50     return;
  51   }
  52
  53   get_pool_id();
  54 }
  55
  56 template<typename I>
  57 void CreateRequest<I>::get_pool_id() {
  58   ldout(m_cct, 20) << this << " " << __func__ << dendl;
  59
  60   if (m_object_pool.empty()) {
  61     create_journal();
  62     return;
  63   }
  64
  65   librados::Rados rados(m_ioctx);
  66   IoCtx data_ioctx;
  67   int r = rados.ioctx_create(m_object_pool.c_str(), data_ioctx);
  68   if (r != 0) {
  69     lderr(m_cct) << "failed to create journal: "
  70                  << "error opening journal object pool '" << m_object_pool
  71                  << "': " << cpp_strerror(r) << dendl;
  72     complete(r);
  73     return;
  74   }
  75   data_ioctx.set_namespace(m_ioctx.get_namespace());
  76
  77   m_pool_id = data_ioctx.get_id();
  78   create_journal();
  79 }
  80
  81 template<typename I>
  82 void CreateRequest<I>::create_journal() {
  83   ldout(m_cct, 20) << this << " " << __func__ << dendl;
  84
  85   ImageCtx::get_timer_instance(m_cct, &m_timer, &m_timer_lock);
  86   m_journaler = new Journaler(m_op_work_queue, m_timer, m_timer_lock, m_ioctx,
  87                               m_image_id, m_image_client_id, {}, nullptr);
  88
  89   using klass = CreateRequest<I>;
  90   Context *ctx = create_context_callback<klass, &klass::handle_create_journal>(this);
  91
  92   m_journaler->create(m_order, m_splay_width, m_pool_id, ctx);
  93 }
  94
  95 template<typename I>
  96 Context *CreateRequest<I>::handle_create_journal(int *result) {
  97   ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
  98
  99   if (*result < 0) {
 100     lderr(m_cct) << "failed to create journal: " << cpp_strerror(*result) << dendl;
 101     shut_down_journaler(*result);
 102     return nullptr;
 103   }
 104
 105   allocate_journal_tag();
 106   return nullptr;
 107 }
 108
 109 template<typename I>
 110 void CreateRequest<I>::allocate_journal_tag() {
 111   ldout(m_cct, 20) << this << " " << __func__ << dendl;
 112
 113   using klass = CreateRequest<I>;
 114   Context *ctx = create_context_callback<klass, &klass::handle_journal_tag>(this);
 115
 116   encode(m_tag_data, m_bl);
 117   m_journaler->allocate_tag(m_tag_class, m_bl, &m_tag, ctx);
 118 }
 119
 120 template<typename I>
 121 Context *CreateRequest<I>::handle_journal_tag(int *result) {
 122   ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
 123
 124   if (*result < 0) {
 125     lderr(m_cct) << "failed to allocate tag: " << cpp_strerror(*result) << dendl;
 126     shut_down_journaler(*result);
 127     return nullptr;
 128   }
 129
 130   register_client();
 131   return nullptr;
 132 }
 133
 134 template<typename I>
 135 void CreateRequest<I>::register_client() {
 136   ldout(m_cct, 20) << this << " " << __func__ << dendl;
 137
 138   m_bl.clear();
 139   encode(ClientData{ImageClientMeta{m_tag.tag_class}}, m_bl);
 140
 141   using klass = CreateRequest<I>;
 142   Context *ctx = create_context_callback<klass, &klass::handle_register_client>(this);
 143
 144   m_journaler->register_client(m_bl, ctx);
 145 }
 146
 147 template<typename I>
 148 Context *CreateRequest<I>::handle_register_client(int *result) {
 149   ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
 150
 151   if (*result < 0) {
 152     lderr(m_cct) << "failed to register client: " << cpp_strerror(*result) << dendl;
 153   }
 154
 155   shut_down_journaler(*result);
 156   return nullptr;
 157 }
 158
 159 template<typename I>
 160 void CreateRequest<I>::shut_down_journaler(int r) {
 161   ldout(m_cct, 20) << this << " " << __func__ << dendl;
 162
 163   m_r_saved = r;
 164
 165   using klass = CreateRequest<I>;
 166   Context *ctx = create_context_callback<klass, &klass::handle_journaler_shutdown>(this);
 167
 168   m_journaler->shut_down(ctx);
 169 }
 170
 171 template<typename I>
 172 Context *CreateRequest<I>::handle_journaler_shutdown(int *result) {
 173   ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
 174
 175   if (*result < 0) {
 176     lderr(m_cct) << "failed to shut down journaler: " << cpp_strerror(*result) << dendl;
 177   }
 178
 179   delete m_journaler;
 180
 181   if (!m_r_saved) {
 182     complete(0);
 183     return nullptr;
 184   }
 185
 186   // there was an error during journal creation, so we rollback
 187   // what ever was done. the easiest way to do this is to invoke
 188   // journal remove state machine, although it's not the most
 189   // cleanest approach when it comes to redundancy, but that's
 190   // ok during the failure path.
 191   remove_journal();
 192   return nullptr;
 193 }
 194
 195 template<typename I>
 196 void CreateRequest<I>::remove_journal() {
 197   ldout(m_cct, 20) << this << " " << __func__ << dendl;
 198
 199   using klass = CreateRequest<I>;
 200   Context *ctx = create_context_callback<klass, &klass::handle_remove_journal>(this);
 201
 202   RemoveRequest<I> *req = RemoveRequest<I>::create(
 203     m_ioctx, m_image_id, m_image_client_id, m_op_work_queue, ctx);
 204   req->send();
 205 }
 206
 207 template<typename I>
 208 Context *CreateRequest<I>::handle_remove_journal(int *result) {
 209   ldout(m_cct, 20) << __func__ << ": r=" << *result << dendl;
 210
 211   if (*result < 0) {
 212     lderr(m_cct) << "error cleaning up journal after creation failed: "
 213                  << cpp_strerror(*result) << dendl;
 214   }
 215
 216   complete(m_r_saved);
 217   return nullptr;
 218 }
 219
 220 template<typename I>
 221 void CreateRequest<I>::complete(int r) {
 222   ldout(m_cct, 20) << this << " " << __func__ << dendl;
 223
 224   if (r == 0) {
 225     ldout(m_cct, 20) << "done." << dendl;
 226   }
 227
 228   m_on_finish->complete(r);
 229   delete this;
 230 }
 231
 232 } // namespace journal
 233 } // namespace librbd
 234
 235 template class librbd::journal::CreateRequest<librbd::ImageCtx>;