1 files changed, 157 insertions, 0 deletions
diff --git a/src/librbd/object_map/LockRequest.cc b/src/librbd/object_map/LockRequest.cc
new file mode 100644
index 00000000..4ed4fa1b
--- /dev/null
+++ b/src/librbd/object_map/LockRequest.cc
@@ -0,0 +1,157 @@
+// -*- mode:C; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/object_map/LockRequest.h"
+#include "cls/lock/cls_lock_client.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/Utils.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::object_map::LockRequest: "
+
+namespace librbd {
+namespace object_map {
+
+using util::create_rados_callback;
+
+template <typename I>
+LockRequest<I>::LockRequest(I &image_ctx, Context *on_finish)
+  : m_image_ctx(image_ctx), m_on_finish(on_finish), m_broke_lock(false) {
+}
+
+template <typename I>
+void LockRequest<I>::send() {
+  send_lock();
+}
+
+template <typename I>
+void LockRequest<I>::send_lock() {
+  CephContext *cct = m_image_ctx.cct;
+  std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
+  ldout(cct, 10) << this << " " << __func__ << ": oid=" << oid << dendl;
+
+  librados::ObjectWriteOperation op;
+  rados::cls::lock::lock(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "", "",
+                           utime_t(), 0);
+
+  using klass = LockRequest<I>;
+  librados::AioCompletion *rados_completion =
+    create_rados_callback<klass, &klass::handle_lock>(this);
+  int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
+  ceph_assert(r == 0);
+  rados_completion->release();
+}
+
+template <typename I>
+Context *LockRequest<I>::handle_lock(int *ret_val) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << *ret_val << dendl;
+
+  if (*ret_val == 0) {
+    return m_on_finish;
+  } else if (*ret_val == -EEXIST) {
+    // already locked by myself
+    *ret_val = 0;
+    return m_on_finish;
+  } else if (m_broke_lock || *ret_val != -EBUSY) {
+    lderr(cct) << "failed to lock object map: " << cpp_strerror(*ret_val)
+               << dendl;
+    *ret_val = 0;
+    return m_on_finish;
+  }
+
+  send_get_lock_info();
+  return nullptr;
+}
+
+template <typename I>
+void LockRequest<I>::send_get_lock_info() {
+  CephContext *cct = m_image_ctx.cct;
+  std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
+  ldout(cct, 10) << this << " " << __func__ << ": oid=" << oid << dendl;
+
+  librados::ObjectReadOperation op;
+  rados::cls::lock::get_lock_info_start(&op, RBD_LOCK_NAME);
+
+  using klass = LockRequest<I>;
+  librados::AioCompletion *rados_completion =
+    create_rados_callback<klass, &klass::handle_get_lock_info>(this);
+  int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op, &m_out_bl);
+  ceph_assert(r == 0);
+  rados_completion->release();
+}
+
+template <typename I>
+Context *LockRequest<I>::handle_get_lock_info(int *ret_val) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << *ret_val << dendl;
+
+  if (*ret_val == -ENOENT) {
+    send_lock();
+    return nullptr;
+  }
+
+  ClsLockType lock_type;
+  std::string lock_tag;
+  if (*ret_val == 0) {
+    auto it = m_out_bl.cbegin();
+    *ret_val = rados::cls::lock::get_lock_info_finish(&it, &m_lockers,
+                                                      &lock_type, &lock_tag);
+  }
+  if (*ret_val < 0) {
+    lderr(cct) << "failed to list object map locks: " << cpp_strerror(*ret_val)
+               << dendl;
+    *ret_val = 0;
+    return m_on_finish;
+  }
+
+  send_break_locks();
+  return nullptr;
+}
+
+template <typename I>
+void LockRequest<I>::send_break_locks() {
+  CephContext *cct = m_image_ctx.cct;
+  std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, CEPH_NOSNAP));
+  ldout(cct, 10) << this << " " << __func__ << ": oid=" << oid << ", "
+                 << "num_lockers=" << m_lockers.size() << dendl;
+
+  librados::ObjectWriteOperation op;
+  for (auto &locker : m_lockers) {
+    rados::cls::lock::break_lock(&op, RBD_LOCK_NAME, locker.first.cookie,
+                                 locker.first.locker);
+  }
+
+  using klass = LockRequest<I>;
+  librados::AioCompletion *rados_completion =
+    create_rados_callback<klass, &klass::handle_break_locks>(this);
+  int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
+  ceph_assert(r == 0);
+  rados_completion->release();
+}
+
+template <typename I>
+Context *LockRequest<I>::handle_break_locks(int *ret_val) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << *ret_val << dendl;
+
+  m_broke_lock = true;
+  if (*ret_val == 0 || *ret_val == -ENOENT) {
+    send_lock();
+    return nullptr;
+  }
+
+  lderr(cct) << "failed to break object map lock: " << cpp_strerror(*ret_val)
+             << dendl;
+  *ret_val = 0;
+  return m_on_finish;
+}
+
+} // namespace object_map
+} // namespace librbd
+
+template class librbd::object_map::LockRequest<librbd::ImageCtx>;