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diff --git a/src/ceph/src/common/common_init.cc b/src/ceph/src/common/common_init.cc
new file mode 100644
index 0000000..7889f42
--- /dev/null
+++ b/src/ceph/src/common/common_init.cc
@@ -0,0 +1,124 @@
+// -*- 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) 2010-2011 Dreamhost
+ *
+ * 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 "common/admin_socket.h"
+#include "common/ceph_argparse.h"
+#include "common/common_init.h"
+#include "common/valgrind.h"
+#include "common/zipkin_trace.h"
+
+#define dout_subsys ceph_subsys_
+
+#define _STR(x) #x
+#define STRINGIFY(x) _STR(x)
+
+CephContext *common_preinit(const CephInitParameters &iparams,
+			    enum code_environment_t code_env, int flags,
+			    const char *data_dir_option)
+{
+  // set code environment
+  ANNOTATE_BENIGN_RACE_SIZED(&g_code_env, sizeof(g_code_env), "g_code_env");
+  g_code_env = code_env;
+
+  // Create a configuration object
+  CephContext *cct = new CephContext(iparams.module_type, code_env, flags);
+
+  md_config_t *conf = cct->_conf;
+  // add config observers here
+
+  // Set up our entity name.
+  conf->name = iparams.name;
+
+  if (data_dir_option)
+    conf->data_dir_option = data_dir_option;
+
+  // different default keyring locations for osd and mds.  this is
+  // for backward compatibility.  moving forward, we want all keyrings
+  // in these locations.  the mon already forces $mon_data/keyring.
+  if (conf->name.is_mds()) {
+    conf->set_val("keyring", "$mds_data/keyring", false);
+  } else if (conf->name.is_osd()) {
+    conf->set_val("keyring", "$osd_data/keyring", false);
+  }
+
+  if (code_env == CODE_ENVIRONMENT_LIBRARY ||
+      code_env == CODE_ENVIRONMENT_UTILITY_NODOUT) {
+    conf->set_val_or_die("log_to_stderr", "false");
+    conf->set_val_or_die("err_to_stderr", "false");
+    conf->set_val_or_die("log_flush_on_exit", "false");
+  }
+  if (code_env != CODE_ENVIRONMENT_DAEMON) {
+    // NOTE: disable ms subsystem gathering in clients by default
+    conf->set_val_or_die("debug_ms", "0/0");
+  }
+
+  return cct;
+}
+
+void complain_about_parse_errors(CephContext *cct,
+				 std::deque<std::string> *parse_errors)
+{
+  if (parse_errors->empty())
+    return;
+  lderr(cct) << "Errors while parsing config file!" << dendl;
+  int cur_err = 0;
+  static const int MAX_PARSE_ERRORS = 20;
+  for (std::deque<std::string>::const_iterator p = parse_errors->begin();
+       p != parse_errors->end(); ++p)
+  {
+    lderr(cct) << *p << dendl;
+    if (cur_err == MAX_PARSE_ERRORS) {
+      lderr(cct) << "Suppressed " << (parse_errors->size() - MAX_PARSE_ERRORS)
+	   << " more errors." << dendl;
+      break;
+    }
+    ++cur_err;
+  }
+}
+
+/* Please be sure that this can safely be called multiple times by the
+ * same application. */
+void common_init_finish(CephContext *cct)
+{
+  cct->init_crypto();
+  ZTracer::ztrace_init();
+
+  int flags = cct->get_init_flags();
+  if (!(flags & CINIT_FLAG_NO_DAEMON_ACTIONS))
+    cct->start_service_thread();
+
+  if ((flags & CINIT_FLAG_DEFER_DROP_PRIVILEGES) &&
+      (cct->get_set_uid() || cct->get_set_gid())) {
+    cct->get_admin_socket()->chown(cct->get_set_uid(), cct->get_set_gid());
+  }
+
+  md_config_t *conf = cct->_conf;
+
+  if (!conf->admin_socket.empty() && !conf->admin_socket_mode.empty()) {
+    int ret = 0;
+    std::string err;
+
+    ret = strict_strtol(conf->admin_socket_mode.c_str(), 8, &err);
+    if (err.empty()) {
+      if (!(ret & (~ACCESSPERMS))) {
+        cct->get_admin_socket()->chmod(static_cast<mode_t>(ret));
+      } else {
+        lderr(cct) << "Invalid octal permissions string: "
+            << conf->admin_socket_mode << dendl;
+      }
+    } else {
+      lderr(cct) << "Invalid octal string: " << err << dendl;
+    }
+  }
+}