1 files changed, 56 insertions, 0 deletions
diff --git a/src/librbd/cache/ImageCache.h b/src/librbd/cache/ImageCache.h
new file mode 100644
index 00000000..71af11f2
--- /dev/null
+++ b/src/librbd/cache/ImageCache.h
@@ -0,0 +1,56 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_CACHE_IMAGE_CACHE
+#define CEPH_LIBRBD_CACHE_IMAGE_CACHE
+
+#include "include/buffer_fwd.h"
+#include "include/int_types.h"
+#include <vector>
+
+class Context;
+
+namespace librbd {
+namespace cache {
+
+/**
+ * client-side, image extent cache interface
+ */
+struct ImageCache {
+  typedef std::vector<std::pair<uint64_t,uint64_t> > Extents;
+
+  virtual ~ImageCache() {
+  }
+
+  /// client AIO methods
+  virtual void aio_read(Extents&& image_extents, ceph::bufferlist* bl,
+                        int fadvise_flags, Context *on_finish) = 0;
+  virtual void aio_write(Extents&& image_extents, ceph::bufferlist&& bl,
+                         int fadvise_flags, Context *on_finish) = 0;
+  virtual void aio_discard(uint64_t offset, uint64_t length,
+                           uint32_t discard_granularity_bytes,
+                           Context *on_finish) = 0;
+  virtual void aio_flush(Context *on_finish) = 0;
+  virtual void aio_writesame(uint64_t offset, uint64_t length,
+                             ceph::bufferlist&& bl,
+                             int fadvise_flags, Context *on_finish) = 0;
+  virtual void aio_compare_and_write(Extents&& image_extents,
+                                     ceph::bufferlist&& cmp_bl,
+                                     ceph::bufferlist&& bl,
+                                     uint64_t *mismatch_offset,
+                                     int fadvise_flags,
+                                     Context *on_finish) = 0;
+
+  /// internal state methods
+  virtual void init(Context *on_finish) = 0;
+  virtual void shut_down(Context *on_finish) = 0;
+
+  virtual void invalidate(Context *on_finish) = 0;
+  virtual void flush(Context *on_finish) = 0;
+
+};
+
+} // namespace cache
+} // namespace librbd
+
+#endif // CEPH_LIBRBD_CACHE_IMAGE_CACHE