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diff --git a/src/ceph/src/librbd/cache/PassthroughImageCache.cc b/src/ceph/src/librbd/cache/PassthroughImageCache.cc
new file mode 100644
index 0000000..5b22fc7
--- /dev/null
+++ b/src/ceph/src/librbd/cache/PassthroughImageCache.cc
@@ -0,0 +1,133 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "PassthroughImageCache.h"
+#include "include/buffer.h"
+#include "common/dout.h"
+#include "librbd/ImageCtx.h"
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::PassthroughImageCache: " << this << " " \
+                           <<  __func__ << ": "
+
+namespace librbd {
+namespace cache {
+
+template <typename I>
+PassthroughImageCache<I>::PassthroughImageCache(ImageCtx &image_ctx)
+  : m_image_ctx(image_ctx), m_image_writeback(image_ctx) {
+}
+
+template <typename I>
+void PassthroughImageCache<I>::aio_read(Extents &&image_extents, bufferlist *bl,
+                                        int fadvise_flags, Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "image_extents=" << image_extents << ", "
+                 << "on_finish=" << on_finish << dendl;
+
+  m_image_writeback.aio_read(std::move(image_extents), bl, fadvise_flags,
+                             on_finish);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::aio_write(Extents &&image_extents,
+                                         bufferlist&& bl,
+                                         int fadvise_flags,
+                                         Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "image_extents=" << image_extents << ", "
+                 << "on_finish=" << on_finish << dendl;
+
+  m_image_writeback.aio_write(std::move(image_extents), std::move(bl),
+                              fadvise_flags, on_finish);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::aio_discard(uint64_t offset, uint64_t length,
+                                           bool skip_partial_discard, Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "offset=" << offset << ", "
+                 << "length=" << length << ", "
+                 << "on_finish=" << on_finish << dendl;
+
+  m_image_writeback.aio_discard(offset, length, skip_partial_discard, on_finish);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::aio_flush(Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "on_finish=" << on_finish << dendl;
+
+  m_image_writeback.aio_flush(on_finish);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::aio_writesame(uint64_t offset, uint64_t length,
+                                             bufferlist&& bl, int fadvise_flags,
+                                             Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "offset=" << offset << ", "
+                 << "length=" << length << ", "
+                 << "data_len=" << bl.length() << ", "
+                 << "on_finish=" << on_finish << dendl;
+
+  m_image_writeback.aio_writesame(offset, length, std::move(bl), fadvise_flags,
+                                  on_finish);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::aio_compare_and_write(Extents &&image_extents,
+                                                     bufferlist&& cmp_bl,
+                                                     bufferlist&& bl,
+                                                     uint64_t *mismatch_offset,
+                                                     int fadvise_flags,
+                                                     Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << "image_extents=" << image_extents << ", "
+                 << "on_finish=" << on_finish << dendl;
+
+  m_image_writeback.aio_compare_and_write(
+    std::move(image_extents), std::move(cmp_bl), std::move(bl), mismatch_offset,
+    fadvise_flags, on_finish);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::init(Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << dendl;
+
+  on_finish->complete(0);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::shut_down(Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << dendl;
+
+  on_finish->complete(0);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::invalidate(Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << dendl;
+
+  // dump cache contents (don't have anything)
+  on_finish->complete(0);
+}
+
+template <typename I>
+void PassthroughImageCache<I>::flush(Context *on_finish) {
+  CephContext *cct = m_image_ctx.cct;
+  ldout(cct, 20) << dendl;
+
+  // internal flush -- nothing to writeback but make sure
+  // in-flight IO is flushed
+  aio_flush(on_finish);
+}
+
+} // namespace cache
+} // namespace librbd
+
+template class librbd::cache::PassthroughImageCache<librbd::ImageCtx>;