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diff --git a/src/ceph/src/test/bench/dumb_backend.cc b/src/ceph/src/test/bench/dumb_backend.cc
new file mode 100644
index 0000000..5160532
--- /dev/null
+++ b/src/ceph/src/test/bench/dumb_backend.cc
@@ -0,0 +1,117 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+
+#include "acconfig.h"
+
+#include <unistd.h>
+#include "dumb_backend.h"
+
+string DumbBackend::get_full_path(const string &oid)
+{
+	return path + "/" + oid;
+}
+
+void DumbBackend::_write(
+  const string &oid,
+  uint64_t offset,
+  const bufferlist &bl,
+  Context *on_applied,
+  Context *on_commit)
+{
+  string full_path(get_full_path(oid));
+  int fd = ::open(
+    full_path.c_str(), O_CREAT|O_WRONLY, 0777);
+  if (fd < 0) {
+    std::cout << full_path << ": errno is " << errno << std::endl;
+    ceph_abort();
+  }
+
+  int r =  ::lseek(fd, offset, SEEK_SET);
+  if (r < 0) {
+    r = errno;
+    std::cout << "lseek failed, errno is: " << r << std::endl;
+    ::close(fd);
+    return;
+  }
+  bl.write_fd(fd);
+  on_applied->complete(0);
+  if (do_fsync)
+    ::fsync(fd);
+#ifdef HAVE_SYNC_FILE_RANGE
+  if (do_sync_file_range)
+    ::sync_file_range(fd, offset, bl.length(),
+		      SYNC_FILE_RANGE_WAIT_AFTER);
+#else
+# warning "sync_file_range not supported!"
+#endif
+#ifdef HAVE_POSIX_FADVISE
+  if (do_fadvise) {
+    int fa_r = ::posix_fadvise(fd, offset, bl.length(), POSIX_FADV_DONTNEED);
+    if (fa_r) {
+        std::cout << "posix_fadvise failed, errno is: " << fa_r << std::endl;
+    }
+  }
+#else
+# warning "posix_fadvise not supported!"
+#endif
+  ::close(fd);
+  {
+    Mutex::Locker l(pending_commit_mutex);
+    pending_commits.insert(on_commit);
+  }
+  sem.Put();
+}
+
+void DumbBackend::read(
+  const string &oid,
+  uint64_t offset,
+  uint64_t length,
+  bufferlist *bl,
+  Context *on_complete)
+{
+  string full_path(get_full_path(oid));
+  int fd = ::open(
+    full_path.c_str(), 0, O_RDONLY);
+  if (fd < 0) return;
+
+  int r = ::lseek(fd, offset, SEEK_SET);
+  if (r < 0) {
+    r = errno;
+    std::cout << "lseek failed, errno is: " << r << std::endl;
+    ::close(fd);
+    return;
+  }
+
+  bl->read_fd(fd, length);
+  ::close(fd);
+  on_complete->complete(0);
+}
+
+void DumbBackend::sync_loop()
+{
+  while (1) {
+    sleep(sync_interval);
+    {
+      Mutex::Locker l(sync_loop_mutex);
+      if (sync_loop_stop != 0) {
+	sync_loop_stop = 2;
+	sync_loop_cond.Signal();
+	break;
+      }
+    }
+    tp.pause();
+#ifdef HAVE_SYS_SYNCFS
+    ::syncfs(sync_fd);
+#else
+    ::sync();
+#endif
+    {
+      Mutex::Locker l(pending_commit_mutex);
+      for (set<Context*>::iterator i = pending_commits.begin();
+	   i != pending_commits.end();
+	   pending_commits.erase(i++)) {
+	(*i)->complete(0);
+      }
+    }
+    tp.unpause();
+  }
+}