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diff --git a/src/ceph/src/rgw/rgw_quota.h b/src/ceph/src/rgw/rgw_quota.h
new file mode 100644
index 0000000..49ec148
--- /dev/null
+++ b/src/ceph/src/rgw/rgw_quota.h
@@ -0,0 +1,117 @@
+// -*- 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) 2013 Inktank, Inc
+ *
+ * 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.
+ *
+ */
+
+#ifndef CEPH_RGW_QUOTA_H
+#define CEPH_RGW_QUOTA_H
+
+#include "include/utime.h"
+#include "common/lru_map.h"
+
+#include <atomic>
+
+static inline int64_t rgw_rounded_kb(int64_t bytes)
+{
+  return (bytes + 1023) / 1024;
+}
+
+class RGWRados;
+class JSONObj;
+
+struct RGWQuotaInfo {
+  template<class T> friend class RGWQuotaCache;
+protected:
+  /* The quota thresholds after which comparing against cached storage stats
+   * is disallowed. Those fields may be accessed only by the RGWQuotaCache.
+   * They are not intended as tunables but rather as a mean to store results
+   * of repeating calculations in the quota cache subsystem. */
+  int64_t max_size_soft_threshold;
+  int64_t max_objs_soft_threshold;
+
+public:
+  int64_t max_size;
+  int64_t max_objects;
+  bool enabled;
+  /* Do we want to compare with raw, not rounded RGWStorageStats::size (true)
+   * or maybe rounded-to-4KiB RGWStorageStats::size_rounded (false)? */
+  bool check_on_raw;
+
+  RGWQuotaInfo()
+    : max_size_soft_threshold(-1),
+      max_objs_soft_threshold(-1),
+      max_size(-1),
+      max_objects(-1),
+      enabled(false),
+      check_on_raw(false) {
+  }
+
+  void encode(bufferlist& bl) const {
+    ENCODE_START(3, 1, bl);
+    if (max_size < 0) {
+      ::encode(-rgw_rounded_kb(abs(max_size)), bl);
+    } else {
+      ::encode(rgw_rounded_kb(max_size), bl);
+    }
+    ::encode(max_objects, bl);
+    ::encode(enabled, bl);
+    ::encode(max_size, bl);
+    ::encode(check_on_raw, bl);
+    ENCODE_FINISH(bl);
+  }
+  void decode(bufferlist::iterator& bl) {
+    DECODE_START_LEGACY_COMPAT_LEN(3, 1, 1, bl);
+    int64_t max_size_kb;
+    ::decode(max_size_kb, bl);
+    ::decode(max_objects, bl);
+    ::decode(enabled, bl);
+    if (struct_v < 2) {
+      max_size = max_size_kb * 1024;
+    } else {
+      ::decode(max_size, bl);
+    }
+    if (struct_v >= 3) {
+      ::decode(check_on_raw, bl);
+    }
+    DECODE_FINISH(bl);
+  }
+
+  void dump(Formatter *f) const;
+
+  void decode_json(JSONObj *obj);
+
+};
+WRITE_CLASS_ENCODER(RGWQuotaInfo)
+
+struct rgw_bucket;
+
+class RGWQuotaHandler {
+public:
+  RGWQuotaHandler() {}
+  virtual ~RGWQuotaHandler() {
+  }
+  virtual int check_quota(const rgw_user& bucket_owner, rgw_bucket& bucket,
+                          RGWQuotaInfo& user_quota, RGWQuotaInfo& bucket_quota,
+			  uint64_t num_objs, uint64_t size) = 0;
+
+  virtual int check_bucket_shards(uint64_t max_objs_per_shard, uint64_t num_shards,
+				  const rgw_user& bucket_owner, const rgw_bucket& bucket,
+				  RGWQuotaInfo& bucket_quota, uint64_t num_objs, bool& need_resharding,
+                                  uint32_t *suggested_num_shards) = 0;
+
+  virtual void update_stats(const rgw_user& bucket_owner, rgw_bucket& bucket, int obj_delta, uint64_t added_bytes, uint64_t removed_bytes) = 0;
+
+  static RGWQuotaHandler *generate_handler(RGWRados *store, bool quota_threads);
+  static void free_handler(RGWQuotaHandler *handler);
+};
+
+#endif