1 files changed, 166 insertions, 0 deletions
diff --git a/src/librbd/io/RefreshImageDispatch.cc b/src/librbd/io/RefreshImageDispatch.cc
new file mode 100644
index 000000000..3141faf25
--- /dev/null
+++ b/src/librbd/io/RefreshImageDispatch.cc
@@ -0,0 +1,166 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/io/RefreshImageDispatch.h"
+#include "common/dout.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include <map>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::io::RefreshImageDispatch: " << this \
+                           << " " << __func__ << ": "
+
+namespace librbd {
+namespace io {
+
+template <typename I>
+RefreshImageDispatch<I>::RefreshImageDispatch(I* image_ctx)
+  : m_image_ctx(image_ctx) {
+  auto cct = m_image_ctx->cct;
+  ldout(cct, 5) << "ictx=" << image_ctx << dendl;
+}
+
+template <typename I>
+void RefreshImageDispatch<I>::shut_down(Context* on_finish) {
+  on_finish->complete(0);
+}
+
+template <typename I>
+bool RefreshImageDispatch<I>::read(
+    AioCompletion* aio_comp, Extents &&image_extents, ReadResult &&read_result,
+    IOContext io_context, int op_flags, int read_flags,
+    const ZTracer::Trace &parent_trace, uint64_t tid,
+    std::atomic<uint32_t>* image_dispatch_flags,
+    DispatchResult* dispatch_result, Context** on_finish,
+    Context* on_dispatched) {
+  auto cct = m_image_ctx->cct;
+  ldout(cct, 20) << "tid=" << tid << ", image_extents=" << image_extents
+                 << dendl;
+
+  if (needs_refresh(dispatch_result, on_dispatched)) {
+    return true;
+  }
+
+  return false;
+}
+
+template <typename I>
+bool RefreshImageDispatch<I>::write(
+    AioCompletion* aio_comp, Extents &&image_extents, bufferlist &&bl,
+    int op_flags, const ZTracer::Trace &parent_trace,
+    uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+    DispatchResult* dispatch_result, Context** on_finish,
+    Context* on_dispatched) {
+  auto cct = m_image_ctx->cct;
+  ldout(cct, 20) << "tid=" << tid << ", image_extents=" << image_extents
+                 << dendl;
+
+  if (needs_refresh(dispatch_result, on_dispatched)) {
+    return true;
+  }
+
+  return false;
+}
+
+template <typename I>
+bool RefreshImageDispatch<I>::discard(
+    AioCompletion* aio_comp, Extents &&image_extents,
+    uint32_t discard_granularity_bytes, const ZTracer::Trace &parent_trace,
+    uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+    DispatchResult* dispatch_result, Context** on_finish,
+    Context* on_dispatched) {
+  auto cct = m_image_ctx->cct;
+  ldout(cct, 20) << "tid=" << tid << ", image_extents=" << image_extents
+                 << dendl;
+
+  if (needs_refresh(dispatch_result, on_dispatched)) {
+    return true;
+  }
+
+  return false;
+}
+
+template <typename I>
+bool RefreshImageDispatch<I>::write_same(
+    AioCompletion* aio_comp, Extents &&image_extents, bufferlist &&bl,
+    int op_flags, const ZTracer::Trace &parent_trace,
+    uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+    DispatchResult* dispatch_result, Context** on_finish,
+    Context* on_dispatched) {
+  auto cct = m_image_ctx->cct;
+  ldout(cct, 20) << "tid=" << tid << ", image_extents=" << image_extents
+                 << dendl;
+
+  if (needs_refresh(dispatch_result, on_dispatched)) {
+    return true;
+  }
+
+  return false;
+}
+
+template <typename I>
+bool RefreshImageDispatch<I>::compare_and_write(
+    AioCompletion* aio_comp, Extents &&image_extents,
+    bufferlist &&cmp_bl, bufferlist &&bl, uint64_t *mismatch_offset,
+    int op_flags, const ZTracer::Trace &parent_trace,
+    uint64_t tid, std::atomic<uint32_t>* image_dispatch_flags,
+    DispatchResult* dispatch_result, Context** on_finish,
+    Context* on_dispatched) {
+  auto cct = m_image_ctx->cct;
+  ldout(cct, 20) << "tid=" << tid << ", image_extents=" << image_extents
+                 << dendl;
+
+  if (needs_refresh(dispatch_result, on_dispatched)) {
+    return true;
+  }
+
+  return false;
+}
+
+template <typename I>
+bool RefreshImageDispatch<I>::flush(
+    AioCompletion* aio_comp, FlushSource flush_source,
+    const ZTracer::Trace &parent_trace, uint64_t tid,
+    std::atomic<uint32_t>* image_dispatch_flags,
+    DispatchResult* dispatch_result, Context** on_finish,
+    Context* on_dispatched) {
+  auto cct = m_image_ctx->cct;
+  ldout(cct, 20) << "tid=" << tid << dendl;
+
+  // The refresh state machine can initiate a flush and it can
+  // enable the exclusive-lock which will also attmept to flush.
+  if (flush_source == FLUSH_SOURCE_REFRESH ||
+      flush_source == FLUSH_SOURCE_EXCLUSIVE_LOCK_SKIP_REFRESH ||
+      flush_source == FLUSH_SOURCE_SHUTDOWN) {
+    return false;
+  }
+
+  if (needs_refresh(dispatch_result, on_dispatched)) {
+    return true;
+  }
+
+  return false;
+}
+
+template <typename I>
+bool RefreshImageDispatch<I>::needs_refresh(
+    DispatchResult* dispatch_result, Context* on_dispatched) {
+  auto cct = m_image_ctx->cct;
+
+  if (m_image_ctx->state->is_refresh_required()) {
+    ldout(cct, 15) << "on_dispatched=" << on_dispatched << dendl;
+
+    *dispatch_result = DISPATCH_RESULT_CONTINUE;
+    m_image_ctx->state->refresh(on_dispatched);
+    return true;
+  }
+
+  return false;
+}
+
+} // namespace io
+} // namespace librbd
+
+template class librbd::io::RefreshImageDispatch<librbd::ImageCtx>;