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diff --git a/src/ceph/src/rgw/rgw_metadata.h b/src/ceph/src/rgw/rgw_metadata.h
new file mode 100644
index 0000000..f6dc2db
--- /dev/null
+++ b/src/ceph/src/rgw/rgw_metadata.h
@@ -0,0 +1,372 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_RGW_METADATA_H
+#define CEPH_RGW_METADATA_H
+
+#include <string>
+#include <boost/optional.hpp>
+
+#include "include/types.h"
+#include "rgw_common.h"
+#include "rgw_period_history.h"
+#include "cls/version/cls_version_types.h"
+#include "cls/log/cls_log_types.h"
+#include "common/RWLock.h"
+#include "common/RefCountedObj.h"
+#include "common/ceph_time.h"
+
+
+class RGWRados;
+class RGWCoroutine;
+class JSONObj;
+struct RGWObjVersionTracker;
+
+struct obj_version;
+
+
+enum RGWMDLogStatus {
+  MDLOG_STATUS_UNKNOWN,
+  MDLOG_STATUS_WRITE,
+  MDLOG_STATUS_SETATTRS,
+  MDLOG_STATUS_REMOVE,
+  MDLOG_STATUS_COMPLETE,
+  MDLOG_STATUS_ABORT,
+};
+
+class RGWMetadataObject {
+protected:
+  obj_version objv;
+  ceph::real_time mtime;
+  
+public:
+  RGWMetadataObject() {}
+  virtual ~RGWMetadataObject() {}
+  obj_version& get_version();
+  real_time get_mtime() { return mtime; }
+
+  virtual void dump(Formatter *f) const = 0;
+};
+
+class RGWMetadataManager;
+
+class RGWMetadataHandler {
+  friend class RGWMetadataManager;
+
+public:
+  enum sync_type_t {
+    APPLY_ALWAYS,
+    APPLY_UPDATES,
+    APPLY_NEWER
+  };
+  static bool string_to_sync_type(const string& sync_string,
+                                  sync_type_t& type) {
+    if (sync_string.compare("update-by-version") == 0)
+      type = APPLY_UPDATES;
+    else if (sync_string.compare("update-by-timestamp") == 0)
+      type = APPLY_NEWER;
+    else if (sync_string.compare("always") == 0)
+      type = APPLY_ALWAYS;
+    else
+      return false;
+    return true;
+  }
+  virtual ~RGWMetadataHandler() {}
+  virtual string get_type() = 0;
+
+  virtual int get(RGWRados *store, string& entry, RGWMetadataObject **obj) = 0;
+  virtual int put(RGWRados *store, string& entry, RGWObjVersionTracker& objv_tracker,
+                  real_time mtime, JSONObj *obj, sync_type_t type) = 0;
+  virtual int remove(RGWRados *store, string& entry, RGWObjVersionTracker& objv_tracker) = 0;
+
+  virtual int list_keys_init(RGWRados *store, const string& marker, void **phandle) = 0;
+  virtual int list_keys_next(void *handle, int max, list<string>& keys, bool *truncated) = 0;
+  virtual void list_keys_complete(void *handle) = 0;
+
+  virtual string get_marker(void *handle) = 0;
+
+  /* key to use for hashing entries for log shard placement */
+  virtual void get_hash_key(const string& section, const string& key, string& hash_key) {
+    hash_key = section + ":" + key;
+  }
+
+protected:
+  virtual void get_pool_and_oid(RGWRados *store, const string& key, rgw_pool& pool, string& oid) = 0;
+  /**
+   * Compare an incoming versus on-disk tag/version+mtime combo against
+   * the sync mode to see if the new one should replace the on-disk one.
+   *
+   * @return true if the update should proceed, false otherwise.
+   */
+  bool check_versions(const obj_version& ondisk, const real_time& ondisk_time,
+                      const obj_version& incoming, const real_time& incoming_time,
+                      sync_type_t sync_mode) {
+    switch (sync_mode) {
+    case APPLY_UPDATES:
+      if ((ondisk.tag != incoming.tag) ||
+	  (ondisk.ver >= incoming.ver))
+	return false;
+      break;
+    case APPLY_NEWER:
+      if (ondisk_time >= incoming_time)
+	return false;
+      break;
+    case APPLY_ALWAYS: //deliberate fall-thru -- we always apply!
+    default: break;
+    }
+    return true;
+  }
+
+  /*
+   * The tenant_name is always returned on purpose. May be empty, of course.
+   */
+  static void parse_bucket(const string& bucket,
+                           string *tenant_name,
+                           string *bucket_name,
+                           string *bucket_instance = nullptr /* optional */)
+  {
+    int pos = bucket.find('/');
+    if (pos >= 0) {
+      *tenant_name = bucket.substr(0, pos);
+    } else {
+      tenant_name->clear();
+    }
+    string bn = bucket.substr(pos + 1);
+    pos = bn.find (':');
+    if (pos < 0) {
+      *bucket_name = std::move(bn);
+      return;
+    }
+    *bucket_name = bn.substr(0, pos);
+    if (bucket_instance) {
+      *bucket_instance = bn.substr(pos + 1);
+    }
+  }
+};
+
+#define META_LOG_OBJ_PREFIX "meta.log."
+
+struct RGWMetadataLogInfo {
+  string marker;
+  real_time last_update;
+
+  void dump(Formatter *f) const;
+  void decode_json(JSONObj *obj);
+};
+
+class RGWCompletionManager;
+
+class RGWMetadataLogInfoCompletion : public RefCountedObject {
+ public:
+  using info_callback_t = std::function<void(int, const cls_log_header&)>;
+ private:
+  cls_log_header header;
+  librados::IoCtx io_ctx;
+  librados::AioCompletion *completion;
+  std::mutex mutex; //< protects callback between cancel/complete
+  boost::optional<info_callback_t> callback; //< cleared on cancel
+ public:
+  RGWMetadataLogInfoCompletion(info_callback_t callback);
+  ~RGWMetadataLogInfoCompletion() override;
+
+  librados::IoCtx& get_io_ctx() { return io_ctx; }
+  cls_log_header& get_header() { return header; }
+  librados::AioCompletion* get_completion() { return completion; }
+
+  void finish(librados::completion_t cb) {
+    std::lock_guard<std::mutex> lock(mutex);
+    if (callback) {
+      (*callback)(completion->get_return_value(), header);
+    }
+  }
+  void cancel() {
+    std::lock_guard<std::mutex> lock(mutex);
+    callback = boost::none;
+  }
+};
+
+class RGWMetadataLog {
+  CephContext *cct;
+  RGWRados *store;
+  const string prefix;
+
+  static std::string make_prefix(const std::string& period) {
+    if (period.empty())
+      return META_LOG_OBJ_PREFIX;
+    return META_LOG_OBJ_PREFIX + period + ".";
+  }
+
+  RWLock lock;
+  set<int> modified_shards;
+
+  void mark_modified(int shard_id);
+public:
+  RGWMetadataLog(CephContext *_cct, RGWRados *_store, const std::string& period)
+    : cct(_cct), store(_store),
+      prefix(make_prefix(period)),
+      lock("RGWMetaLog::lock") {}
+
+  void get_shard_oid(int id, string& oid) const {
+    char buf[16];
+    snprintf(buf, sizeof(buf), "%d", id);
+    oid = prefix + buf;
+  }
+
+  int add_entry(RGWMetadataHandler *handler, const string& section, const string& key, bufferlist& bl);
+  int store_entries_in_shard(list<cls_log_entry>& entries, int shard_id, librados::AioCompletion *completion);
+
+  struct LogListCtx {
+    int cur_shard;
+    string marker;
+    real_time from_time;
+    real_time end_time;
+
+    string cur_oid;
+
+    bool done;
+
+    LogListCtx() : cur_shard(0), done(false) {}
+  };
+
+  void init_list_entries(int shard_id, const real_time& from_time, const real_time& end_time, string& marker, void **handle);
+  void complete_list_entries(void *handle);
+  int list_entries(void *handle,
+                   int max_entries,
+                   list<cls_log_entry>& entries,
+		   string *out_marker,
+		   bool *truncated);
+
+  int trim(int shard_id, const real_time& from_time, const real_time& end_time, const string& start_marker, const string& end_marker);
+  int get_info(int shard_id, RGWMetadataLogInfo *info);
+  int get_info_async(int shard_id, RGWMetadataLogInfoCompletion *completion);
+  int lock_exclusive(int shard_id, timespan duration, string&zone_id, string& owner_id);
+  int unlock(int shard_id, string& zone_id, string& owner_id);
+
+  int update_shards(list<int>& shards);
+
+  void read_clear_modified(set<int> &modified);
+};
+
+struct LogStatusDump {
+  RGWMDLogStatus status;
+
+  explicit LogStatusDump(RGWMDLogStatus _status) : status(_status) {}
+  void dump(Formatter *f) const;
+};
+
+struct RGWMetadataLogData {
+  obj_version read_version;
+  obj_version write_version;
+  RGWMDLogStatus status;
+  
+  RGWMetadataLogData() : status(MDLOG_STATUS_UNKNOWN) {}
+
+  void encode(bufferlist& bl) const;
+  void decode(bufferlist::iterator& bl);
+  void dump(Formatter *f) const;
+  void decode_json(JSONObj *obj);
+};
+WRITE_CLASS_ENCODER(RGWMetadataLogData)
+
+struct RGWMetadataLogHistory {
+  epoch_t oldest_realm_epoch;
+  std::string oldest_period_id;
+
+  void encode(bufferlist& bl) const {
+    ENCODE_START(1, 1, bl);
+    ::encode(oldest_realm_epoch, bl);
+    ::encode(oldest_period_id, bl);
+    ENCODE_FINISH(bl);
+  }
+  void decode(bufferlist::iterator& p) {
+    DECODE_START(1, p);
+    ::decode(oldest_realm_epoch, p);
+    ::decode(oldest_period_id, p);
+    DECODE_FINISH(p);
+  }
+
+  static const std::string oid;
+};
+WRITE_CLASS_ENCODER(RGWMetadataLogHistory)
+
+class RGWMetadataManager {
+  map<string, RGWMetadataHandler *> handlers;
+  CephContext *cct;
+  RGWRados *store;
+
+  // maintain a separate metadata log for each period
+  std::map<std::string, RGWMetadataLog> md_logs;
+  // use the current period's log for mutating operations
+  RGWMetadataLog* current_log = nullptr;
+
+  void parse_metadata_key(const string& metadata_key, string& type, string& entry);
+
+  int find_handler(const string& metadata_key, RGWMetadataHandler **handler, string& entry);
+  int pre_modify(RGWMetadataHandler *handler, string& section, const string& key,
+                 RGWMetadataLogData& log_data, RGWObjVersionTracker *objv_tracker,
+                 RGWMDLogStatus op_type);
+  int post_modify(RGWMetadataHandler *handler, const string& section, const string& key, RGWMetadataLogData& log_data,
+                 RGWObjVersionTracker *objv_tracker, int ret);
+
+  string heap_oid(RGWMetadataHandler *handler, const string& key, const obj_version& objv);
+  int store_in_heap(RGWMetadataHandler *handler, const string& key, bufferlist& bl,
+                    RGWObjVersionTracker *objv_tracker, real_time mtime,
+                    map<string, bufferlist> *pattrs);
+  int remove_from_heap(RGWMetadataHandler *handler, const string& key, RGWObjVersionTracker *objv_tracker);
+public:
+  RGWMetadataManager(CephContext *_cct, RGWRados *_store);
+  ~RGWMetadataManager();
+
+  int init(const std::string& current_period);
+
+  /// initialize the oldest log period if it doesn't exist, and attach it to
+  /// our current history
+  RGWPeriodHistory::Cursor init_oldest_log_period();
+
+  /// read the oldest log period, and return a cursor to it in our existing
+  /// period history
+  RGWPeriodHistory::Cursor read_oldest_log_period() const;
+
+  /// read the oldest log period asynchronously and write its result to the
+  /// given cursor pointer
+  RGWCoroutine* read_oldest_log_period_cr(RGWPeriodHistory::Cursor *period,
+                                          RGWObjVersionTracker *objv) const;
+
+  /// try to advance the oldest log period when the given period is trimmed,
+  /// using a rados lock to provide atomicity
+  RGWCoroutine* trim_log_period_cr(RGWPeriodHistory::Cursor period,
+                                   RGWObjVersionTracker *objv) const;
+
+  /// find or create the metadata log for the given period
+  RGWMetadataLog* get_log(const std::string& period);
+
+  int register_handler(RGWMetadataHandler *handler);
+
+  RGWMetadataHandler *get_handler(const string& type);
+
+  int put_entry(RGWMetadataHandler *handler, const string& key, bufferlist& bl, bool exclusive,
+                RGWObjVersionTracker *objv_tracker, real_time mtime, map<string, bufferlist> *pattrs = NULL);
+  int remove_entry(RGWMetadataHandler *handler, string& key, RGWObjVersionTracker *objv_tracker);
+  int get(string& metadata_key, Formatter *f);
+  int put(string& metadata_key, bufferlist& bl,
+          RGWMetadataHandler::sync_type_t sync_mode,
+          obj_version *existing_version = NULL);
+  int remove(string& metadata_key);
+
+  int list_keys_init(string& section, void **phandle);
+  int list_keys_init(string& section, const string& marker, void **phandle);
+  int list_keys_next(void *handle, int max, list<string>& keys, bool *truncated);
+  void list_keys_complete(void *handle);
+
+  string get_marker(void *handle);
+
+  void dump_log_entry(cls_log_entry& entry, Formatter *f);
+
+  void get_sections(list<string>& sections);
+  int lock_exclusive(string& metadata_key, timespan duration, string& owner_id);
+  int unlock(string& metadata_key, string& owner_id);
+
+  int get_log_shard_id(const string& section, const string& key, int *shard_id);
+};
+
+#endif