X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Flibrbd%2Fimage%2FCloseRequest.cc;fp=src%2Fceph%2Fsrc%2Flibrbd%2Fimage%2FCloseRequest.cc;h=ee1519bf7d5f1bf0fdf1953cf51cb744a812882d;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/librbd/image/CloseRequest.cc b/src/ceph/src/librbd/image/CloseRequest.cc
new file mode 100644
index 0000000..ee1519b
--- /dev/null
+++ b/src/ceph/src/librbd/image/CloseRequest.cc
@@ -0,0 +1,323 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/image/CloseRequest.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/ImageWatcher.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/Utils.h"
+#include "librbd/io/ImageRequestWQ.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::image::CloseRequest: "
+
+namespace librbd {
+namespace image {
+
+using util::create_async_context_callback;
+using util::create_context_callback;
+
+template <typename I>
+CloseRequest<I>::CloseRequest(I *image_ctx, Context *on_finish)
+  : m_image_ctx(image_ctx), m_on_finish(on_finish), m_error_result(0),
+    m_exclusive_lock(nullptr) {
+  assert(image_ctx != nullptr);
+}
+
+template <typename I>
+void CloseRequest<I>::send() {
+  send_block_image_watcher();
+}
+
+template <typename I>
+void CloseRequest<I>::send_block_image_watcher() {
+  if (m_image_ctx->image_watcher == nullptr) {
+    send_shut_down_update_watchers();
+    return;
+  }
+
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  // prevent incoming requests from our peers
+  m_image_ctx->image_watcher->block_notifies(create_context_callback<
+    CloseRequest<I>, &CloseRequest<I>::handle_block_image_watcher>(this));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_block_image_watcher(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  send_shut_down_update_watchers();
+}
+
+template <typename I>
+void CloseRequest<I>::send_shut_down_update_watchers() {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  m_image_ctx->state->shut_down_update_watchers(create_async_context_callback(
+    *m_image_ctx, create_context_callback<
+      CloseRequest<I>, &CloseRequest<I>::handle_shut_down_update_watchers>(this)));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_shut_down_update_watchers(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  save_result(r);
+  if (r < 0) {
+    lderr(cct) << "failed to shut down update watchers: " << cpp_strerror(r)
+               << dendl;
+  }
+
+  send_shut_down_io_queue();
+}
+
+template <typename I>
+void CloseRequest<I>::send_shut_down_io_queue() {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  RWLock::RLocker owner_locker(m_image_ctx->owner_lock);
+  m_image_ctx->io_work_queue->shut_down(create_context_callback<
+    CloseRequest<I>, &CloseRequest<I>::handle_shut_down_io_queue>(this));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_shut_down_io_queue(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  send_shut_down_exclusive_lock();
+}
+
+template <typename I>
+void CloseRequest<I>::send_shut_down_exclusive_lock() {
+  {
+    RWLock::WLocker owner_locker(m_image_ctx->owner_lock);
+    m_exclusive_lock = m_image_ctx->exclusive_lock;
+
+    // if reading a snapshot -- possible object map is open
+    RWLock::WLocker snap_locker(m_image_ctx->snap_lock);
+    if (m_exclusive_lock == nullptr) {
+      delete m_image_ctx->object_map;
+      m_image_ctx->object_map = nullptr;
+    }
+  }
+
+  if (m_exclusive_lock == nullptr) {
+    send_flush();
+    return;
+  }
+
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  // in-flight IO will be flushed and in-flight requests will be canceled
+  // before releasing lock
+  m_exclusive_lock->shut_down(create_context_callback<
+    CloseRequest<I>, &CloseRequest<I>::handle_shut_down_exclusive_lock>(this));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_shut_down_exclusive_lock(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  {
+    RWLock::RLocker owner_locker(m_image_ctx->owner_lock);
+    assert(m_image_ctx->exclusive_lock == nullptr);
+
+    // object map and journal closed during exclusive lock shutdown
+    RWLock::RLocker snap_locker(m_image_ctx->snap_lock);
+    assert(m_image_ctx->journal == nullptr);
+    assert(m_image_ctx->object_map == nullptr);
+  }
+
+  delete m_exclusive_lock;
+  m_exclusive_lock = nullptr;
+
+  save_result(r);
+  if (r < 0) {
+    lderr(cct) << "failed to shut down exclusive lock: " << cpp_strerror(r)
+               << dendl;
+  }
+
+  send_unregister_image_watcher();
+}
+
+template <typename I>
+void CloseRequest<I>::send_flush() {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  RWLock::RLocker owner_locker(m_image_ctx->owner_lock);
+  m_image_ctx->flush(create_async_context_callback(
+    *m_image_ctx, create_context_callback<
+      CloseRequest<I>, &CloseRequest<I>::handle_flush>(this)));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_flush(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(cct) << "failed to flush IO: " << cpp_strerror(r) << dendl;
+  }
+  send_unregister_image_watcher();
+}
+
+template <typename I>
+void CloseRequest<I>::send_unregister_image_watcher() {
+  if (m_image_ctx->image_watcher == nullptr) {
+    send_flush_readahead();
+    return;
+  }
+
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  m_image_ctx->image_watcher->unregister_watch(create_context_callback<
+    CloseRequest<I>, &CloseRequest<I>::handle_unregister_image_watcher>(this));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_unregister_image_watcher(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  save_result(r);
+  if (r < 0) {
+    lderr(cct) << "failed to unregister image watcher: " << cpp_strerror(r)
+               << dendl;
+  }
+
+  send_flush_readahead();
+}
+
+template <typename I>
+void CloseRequest<I>::send_flush_readahead() {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  m_image_ctx->readahead.wait_for_pending(create_async_context_callback(
+    *m_image_ctx, create_context_callback<
+      CloseRequest<I>, &CloseRequest<I>::handle_flush_readahead>(this)));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_flush_readahead(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  send_shut_down_cache();
+}
+
+template <typename I>
+void CloseRequest<I>::send_shut_down_cache() {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  m_image_ctx->shut_down_cache(create_context_callback<
+    CloseRequest<I>, &CloseRequest<I>::handle_shut_down_cache>(this));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_shut_down_cache(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  save_result(r);
+  if (r < 0) {
+    lderr(cct) << "failed to shut down cache: " << cpp_strerror(r) << dendl;
+  }
+  send_flush_op_work_queue();
+}
+
+template <typename I>
+void CloseRequest<I>::send_flush_op_work_queue() {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  m_image_ctx->op_work_queue->queue(create_context_callback<
+    CloseRequest<I>, &CloseRequest<I>::handle_flush_op_work_queue>(this), 0);
+}
+
+template <typename I>
+void CloseRequest<I>::handle_flush_op_work_queue(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+  send_close_parent();
+}
+
+template <typename I>
+void CloseRequest<I>::send_close_parent() {
+  if (m_image_ctx->parent == nullptr) {
+    send_flush_image_watcher();
+    return;
+  }
+
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << dendl;
+
+  m_image_ctx->parent->state->close(create_async_context_callback(
+    *m_image_ctx, create_context_callback<
+      CloseRequest<I>, &CloseRequest<I>::handle_close_parent>(this)));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_close_parent(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  delete m_image_ctx->parent;
+  save_result(r);
+  if (r < 0) {
+    lderr(cct) << "error closing parent image: " << cpp_strerror(r) << dendl;
+  }
+  send_flush_image_watcher();
+}
+
+template <typename I>
+void CloseRequest<I>::send_flush_image_watcher() {
+  if (m_image_ctx->image_watcher == nullptr) {
+    finish();
+    return;
+  }
+
+  m_image_ctx->image_watcher->flush(create_context_callback<
+    CloseRequest<I>, &CloseRequest<I>::handle_flush_image_watcher>(this));
+}
+
+template <typename I>
+void CloseRequest<I>::handle_flush_image_watcher(int r) {
+  CephContext *cct = m_image_ctx->cct;
+  ldout(cct, 10) << this << " " << __func__ << ": r=" << r << dendl;
+
+  if (r < 0) {
+    lderr(cct) << "error flushing image watcher: " << cpp_strerror(r) << dendl;
+  }
+  save_result(r);
+  finish();
+}
+
+template <typename I>
+void CloseRequest<I>::finish() {
+  m_image_ctx->shutdown();
+  m_on_finish->complete(m_error_result);
+  delete this;
+}
+
+} // namespace image
+} // namespace librbd
+
+template class librbd::image::CloseRequest<librbd::ImageCtx>;