X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Flibrbd%2Fobject_map%2FSnapshotRemoveRequest.cc;fp=src%2Fceph%2Fsrc%2Flibrbd%2Fobject_map%2FSnapshotRemoveRequest.cc;h=821dd5b8781bb6137470c147032c16f3c171cc01;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/librbd/object_map/SnapshotRemoveRequest.cc b/src/ceph/src/librbd/object_map/SnapshotRemoveRequest.cc
new file mode 100644
index 0000000..821dd5b
--- /dev/null
+++ b/src/ceph/src/librbd/object_map/SnapshotRemoveRequest.cc
@@ -0,0 +1,209 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/object_map/SnapshotRemoveRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/object_map/InvalidateRequest.h"
+#include "cls/lock/cls_lock_client.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::object_map::SnapshotRemoveRequest: "
+
+namespace librbd {
+namespace object_map {
+
+namespace {
+
+std::ostream& operator<<(std::ostream& os,
+                         const SnapshotRemoveRequest::State& state) {
+  switch(state) {
+  case SnapshotRemoveRequest::STATE_LOAD_MAP:
+    os << "LOAD_MAP";
+    break;
+  case SnapshotRemoveRequest::STATE_REMOVE_SNAPSHOT:
+    os << "REMOVE_SNAPSHOT";
+    break;
+  case SnapshotRemoveRequest::STATE_INVALIDATE_NEXT_MAP:
+    os << "INVALIDATE_NEXT_MAP";
+    break;
+  case SnapshotRemoveRequest::STATE_REMOVE_MAP:
+    os << "REMOVE_MAP";
+    break;
+  default:
+    os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
+    break;
+  }
+  return os;
+}
+
+} // anonymous namespace
+
+void SnapshotRemoveRequest::send() {
+  assert(m_image_ctx.owner_lock.is_locked());
+  assert(m_image_ctx.snap_lock.is_wlocked());
+
+  if ((m_image_ctx.features & RBD_FEATURE_FAST_DIFF) != 0) {
+    compute_next_snap_id();
+
+    uint64_t flags;
+    int r = m_image_ctx.get_flags(m_snap_id, &flags);
+    assert(r == 0);
+
+    if ((flags & RBD_FLAG_OBJECT_MAP_INVALID) != 0) {
+      send_invalidate_next_map();
+    } else {
+      send_load_map();
+    }
+  } else {
+    send_remove_map();
+  }
+}
+
+bool SnapshotRemoveRequest::should_complete(int r) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", "
+                << "r=" << r << dendl;
+
+  RWLock::RLocker owner_locker(m_image_ctx.owner_lock);
+  bool finished = false;
+  switch (m_state) {
+  case STATE_LOAD_MAP:
+    if (r == -ENOENT) {
+      finished = true;
+      break;
+    }
+
+    if (r == 0) {
+      bufferlist::iterator it = m_out_bl.begin();
+      r = cls_client::object_map_load_finish(&it, &m_snap_object_map);
+    }
+    if (r < 0) {
+      RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
+      send_invalidate_next_map();
+    } else {
+      send_remove_snapshot();
+    }
+    break;
+  case STATE_REMOVE_SNAPSHOT:
+    if (r < 0 && r != -ENOENT) {
+      RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
+      send_invalidate_next_map();
+    } else {
+      update_object_map();
+      send_remove_map();
+    }
+    break;
+  case STATE_INVALIDATE_NEXT_MAP:
+    send_remove_map();
+    break;
+  case STATE_REMOVE_MAP:
+    finished = true;
+    break;
+  default:
+    assert(false);
+    break;
+  }
+  return finished;
+}
+
+void SnapshotRemoveRequest::send_load_map() {
+  CephContext *cct = m_image_ctx.cct;
+  std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
+  ldout(cct, 5) << this << " " << __func__ << ": snap_oid=" << snap_oid
+                << dendl;
+  m_state = STATE_LOAD_MAP;
+
+  librados::ObjectReadOperation op;
+  cls_client::object_map_load_start(&op);
+
+  librados::AioCompletion *rados_completion = create_callback_completion();
+  int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op,
+                                         &m_out_bl);
+  assert(r == 0);
+  rados_completion->release();
+}
+
+void SnapshotRemoveRequest::send_remove_snapshot() {
+  CephContext *cct = m_image_ctx.cct;
+  std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_next_snap_id));
+  ldout(cct, 5) << this << " " << __func__ << ": oid=" << oid << dendl;
+  m_state = STATE_REMOVE_SNAPSHOT;
+
+  librados::ObjectWriteOperation op;
+  if (m_next_snap_id == CEPH_NOSNAP) {
+    rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", "");
+  }
+  cls_client::object_map_snap_remove(&op, m_snap_object_map);
+
+  librados::AioCompletion *rados_completion = create_callback_completion();
+  int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
+  assert(r == 0);
+  rados_completion->release();
+}
+
+void SnapshotRemoveRequest::send_invalidate_next_map() {
+  assert(m_image_ctx.owner_lock.is_locked());
+  assert(m_image_ctx.snap_lock.is_wlocked());
+
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 5) << this << " " << __func__ << dendl;
+  m_state = STATE_INVALIDATE_NEXT_MAP;
+
+  InvalidateRequest<> *req = new InvalidateRequest<>(m_image_ctx,
+                                                     m_next_snap_id, true,
+                                                     create_callback_context());
+  req->send();
+}
+
+void SnapshotRemoveRequest::send_remove_map() {
+  CephContext *cct = m_image_ctx.cct;
+  std::string oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id));
+  ldout(cct, 5) << this << " " << __func__ << ": oid=" << oid << dendl;
+  m_state = STATE_REMOVE_MAP;
+
+  librados::ObjectWriteOperation op;
+  op.remove();
+
+  librados::AioCompletion *rados_completion = create_callback_completion();
+  int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op);
+  assert(r == 0);
+  rados_completion->release();
+}
+
+void SnapshotRemoveRequest::compute_next_snap_id() {
+  assert(m_image_ctx.snap_lock.is_locked());
+
+  m_next_snap_id = CEPH_NOSNAP;
+  std::map<librados::snap_t, SnapInfo>::const_iterator it =
+    m_image_ctx.snap_info.find(m_snap_id);
+  assert(it != m_image_ctx.snap_info.end());
+
+  ++it;
+  if (it != m_image_ctx.snap_info.end()) {
+    m_next_snap_id = it->first;
+  }
+}
+
+void SnapshotRemoveRequest::update_object_map() {
+  RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
+  RWLock::WLocker object_map_locker(m_image_ctx.object_map_lock);
+  if (m_next_snap_id == m_image_ctx.snap_id && m_next_snap_id == CEPH_NOSNAP) {
+    CephContext *cct = m_image_ctx.cct;
+    ldout(cct, 5) << this << " " << __func__ << dendl;
+
+    for (uint64_t i = 0; i < m_object_map.size(); ++i) {
+      if (m_object_map[i] == OBJECT_EXISTS_CLEAN &&
+          (i >= m_snap_object_map.size() ||
+           m_snap_object_map[i] == OBJECT_EXISTS)) {
+        m_object_map[i] = OBJECT_EXISTS;
+      }
+    }
+  }
+}
+
+} // namespace object_map
+} // namespace librbd