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diff --git a/src/ceph/src/common/fd.cc b/src/ceph/src/common/fd.cc
new file mode 100644
index 0000000..243b1eb
--- /dev/null
+++ b/src/ceph/src/common/fd.cc
@@ -0,0 +1,49 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2012 Inktank
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include "include/compat.h"
+#include "debug.h"
+#include "errno.h"
+
+void dump_open_fds(CephContext *cct)
+{
+  const char *fn = PROCPREFIX "/proc/self/fd";
+  DIR *d = opendir(fn);
+  if (!d) {
+    lderr(cct) << "dump_open_fds unable to open " << fn << dendl;
+    return;
+  }
+  struct dirent *de = nullptr;
+
+  int n = 0;
+  while ((de = ::readdir(d))) {
+    if (de->d_name[0] == '.')
+      continue;
+    char path[PATH_MAX];
+    snprintf(path, sizeof(path), "%s/%s", fn, de->d_name);
+    char target[PATH_MAX];
+    ssize_t r = readlink(path, target, sizeof(target) - 1);
+    if (r < 0) {
+      r = -errno;
+      lderr(cct) << "dump_open_fds unable to readlink " << path << ": " << cpp_strerror(r) << dendl;
+      continue;
+    }
+    target[r] = 0;
+    lderr(cct) << "dump_open_fds " << de->d_name << " -> " << target << dendl;
+    n++;
+  }
+  lderr(cct) << "dump_open_fds dumped " << n << " open files" << dendl;
+
+  closedir(d);
+}