1 files changed, 57 insertions, 0 deletions
diff --git a/src/osdc/WritebackHandler.h b/src/osdc/WritebackHandler.h
new file mode 100644
index 000000000..4f4e9aef8
--- /dev/null
+++ b/src/osdc/WritebackHandler.h
@@ -0,0 +1,57 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+#ifndef CEPH_OSDC_WRITEBACKHANDLER_H
+#define CEPH_OSDC_WRITEBACKHANDLER_H
+
+#include "include/Context.h"
+#include "include/types.h"
+#include "common/zipkin_trace.h"
+#include "osd/osd_types.h"
+
+class WritebackHandler {
+ public:
+  WritebackHandler() {}
+  virtual ~WritebackHandler() {}
+
+  virtual void read(const object_t& oid, uint64_t object_no,
+		    const object_locator_t& oloc, uint64_t off, uint64_t len,
+		    snapid_t snapid, ceph::buffer::list *pbl, uint64_t trunc_size,
+		    __u32 trunc_seq, int op_flags,
+                    const ZTracer::Trace &parent_trace, Context *onfinish) = 0;
+  /**
+   * check if a given extent read result may change due to a write
+   *
+   * Check if the content we see at the given read offset may change
+   * due to a write to this object.
+   *
+   * @param oid object
+   * @param read_off read offset
+   * @param read_len read length
+   * @param snapid read snapid
+   */
+  virtual bool may_copy_on_write(const object_t& oid, uint64_t read_off,
+				 uint64_t read_len, snapid_t snapid) = 0;
+  virtual ceph_tid_t write(const object_t& oid, const object_locator_t& oloc,
+			   uint64_t off, uint64_t len,
+			   const SnapContext& snapc,
+			   const ceph::buffer::list &bl, ceph::real_time mtime,
+			   uint64_t trunc_size, __u32 trunc_seq,
+                           ceph_tid_t journal_tid,
+                           const ZTracer::Trace &parent_trace,
+                           Context *oncommit) = 0;
+
+  virtual void overwrite_extent(const object_t& oid, uint64_t off, uint64_t len,
+                                ceph_tid_t original_journal_tid,
+                                ceph_tid_t new_journal_tid) {}
+
+  virtual bool can_scattered_write() { return false; }
+  virtual ceph_tid_t write(const object_t& oid, const object_locator_t& oloc,
+			   std::vector<std::pair<uint64_t, ceph::buffer::list> >& io_vec,
+			   const SnapContext& snapc, ceph::real_time mtime,
+			   uint64_t trunc_size, __u32 trunc_seq,
+			   Context *oncommit) {
+    return 0;
+  }
+};
+
+#endif