initial code repo

[stor4nfv.git] / src / ceph / src / librbd / object_map / UpdateRequest.cc

diff --git a/src/ceph/src/librbd/object_map/UpdateRequest.cc b/src/ceph/src/librbd/object_map/UpdateRequest.cc
new file mode 100644 (file)
index 0000000..9ceb28a
--- /dev/null
+++ b/src/ceph/src/librbd/object_map/UpdateRequest.cc
@@ -0,0 +1,122 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/object_map/UpdateRequest.h"
+#include "include/rbd/object_map_types.h"
+#include "include/stringify.h"
+#include "common/dout.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/Utils.h"
+#include "cls/lock/cls_lock_client.h"
+#include <string>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::object_map::UpdateRequest: " << this \
+                           << " " << __func__ << ": "
+
+namespace librbd {
+namespace object_map {
+
+namespace {
+
+// keep aligned to bit_vector 4K block sizes
+const uint64_t MAX_OBJECTS_PER_UPDATE = 256 * (1 << 10);
+
+}
+
+template <typename I>
+void UpdateRequest<I>::send() {
+  update_object_map();
+}
+
+template <typename I>
+void UpdateRequest<I>::update_object_map() {
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert(m_image_ctx.object_map_lock.is_locked());
+  CephContext *cct = m_image_ctx.cct;
+
+  // break very large requests into manageable batches
+  m_update_end_object_no = MIN(
+    m_end_object_no, m_update_start_object_no + MAX_OBJECTS_PER_UPDATE);
+
+  std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
+  ldout(cct, 20) << "ictx=" << &m_image_ctx << ", oid=" << oid << ", "
+                 << "[" << m_update_start_object_no << ","
+                        << m_update_end_object_no << ") = "
+                << (m_current_state ?
+                      stringify(static_cast<uint32_t>(*m_current_state)) : "")
+                << "->" << static_cast<uint32_t>(m_new_state)
+                << dendl;
+
+  librados::ObjectWriteOperation op;
+  if (m_snap_id == CEPH_NOSNAP) {
+    rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "");
+  }
+  cls_client::object_map_update(&op, m_update_start_object_no,
+                                m_update_end_object_no, m_new_state,
+                                m_current_state);
+
+  auto rados_completion = librbd::util::create_rados_callback<
+    UpdateRequest<I>, &UpdateRequest<I>::handle_update_object_map>(this);
+  std::vector<librados::snap_t> snaps;
+  int r = m_image_ctx.md_ctx.aio_operate(
+    oid, rados_completion, &op, 0, snaps,
+    (m_trace.valid() ? m_trace.get_info() : nullptr));
+  assert(r == 0);
+  rados_completion->release();
+}
+
+template <typename I>
+void UpdateRequest<I>::handle_update_object_map(int r) {
+  ldout(m_image_ctx.cct, 20) << "r=" << r << dendl;
+
+  {
+    RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
+    RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
+    update_in_memory_object_map();
+
+    if (m_update_end_object_no < m_end_object_no) {
+      m_update_start_object_no = m_update_end_object_no;
+      update_object_map();
+      return;
+    }
+  }
+
+  // no more batch updates to send
+  complete(r);
+}
+
+template <typename I>
+void UpdateRequest<I>::update_in_memory_object_map() {
+  assert(m_image_ctx.snap_lock.is_locked());
+  assert(m_image_ctx.object_map_lock.is_locked());
+
+  // rebuilding the object map might update on-disk only
+  if (m_snap_id == m_image_ctx.snap_id) {
+    ldout(m_image_ctx.cct, 20) << dendl;
+
+    auto it = m_object_map.begin() +
+                    MIN(m_update_start_object_no, m_object_map.size());
+    auto end_it = m_object_map.begin() +
+                    MIN(m_update_end_object_no, m_object_map.size());
+    for (; it != end_it; ++it) {
+      auto state_ref = *it;
+      uint8_t state = state_ref;
+      if (!m_current_state || state == *m_current_state ||
+          (*m_current_state == OBJECT_EXISTS && state == OBJECT_EXISTS_CLEAN)) {
+        state_ref = m_new_state;
+      }
+    }
+  }
+}
+
+template <typename I>
+void UpdateRequest<I>::finish_request() {
+}
+
+} // namespace object_map
+} // namespace librbd
+
+template class librbd::object_map::UpdateRequest<librbd::ImageCtx>;