Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1937 insertions, 0 deletions

diff --git a/src/rgw/rgw_zone.cc b/src/rgw/rgw_zone.cc
new file mode 100644
index 00000000..667782d1
--- /dev/null
+++ b/src/rgw/rgw_zone.cc
@@ -0,0 +1,1937 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "common/errno.h"
+
+#include "rgw_zone.h"
+#include "rgw_realm_watcher.h"
+#include "rgw_meta_sync_status.h"
+#include "rgw_sync.h"
+
+#include "services/svc_zone.h"
+#include "services/svc_sys_obj.h"
+
+#define dout_subsys ceph_subsys_rgw
+
+namespace rgw_zone_defaults {
+
+std::string zone_info_oid_prefix = "zone_info.";
+std::string zone_names_oid_prefix = "zone_names.";
+std::string region_info_oid_prefix = "region_info.";
+std::string realm_names_oid_prefix = "realms_names.";
+std::string zone_group_info_oid_prefix = "zonegroup_info.";
+std::string realm_info_oid_prefix = "realms.";
+std::string default_region_info_oid = "default.region";
+std::string default_zone_group_info_oid = "default.zonegroup";
+std::string period_info_oid_prefix = "periods.";
+std::string period_latest_epoch_info_oid = ".latest_epoch";
+std::string region_map_oid = "region_map";
+std::string default_realm_info_oid = "default.realm";
+std::string default_zonegroup_name = "default";
+std::string default_zone_name = "default";
+std::string zonegroup_names_oid_prefix = "zonegroups_names.";
+std::string RGW_DEFAULT_ZONE_ROOT_POOL = "rgw.root";
+std::string RGW_DEFAULT_ZONEGROUP_ROOT_POOL = "rgw.root";
+std::string RGW_DEFAULT_REALM_ROOT_POOL = "rgw.root";
+std::string RGW_DEFAULT_PERIOD_ROOT_POOL = "rgw.root";
+std::string default_bucket_index_pool_suffix = "rgw.buckets.index";
+std::string default_storage_extra_pool_suffix = "rgw.buckets.non-ec";
+std::string avail_pools = ".pools.avail";
+std::string default_storage_pool_suffix = "rgw.buckets.data";
+
+}
+
+using namespace rgw_zone_defaults;
+
+#define FIRST_EPOCH 1
+
+void RGWDefaultZoneGroupInfo::dump(Formatter *f) const {
+  encode_json("default_zonegroup", default_zonegroup, f);
+}
+
+void RGWDefaultZoneGroupInfo::decode_json(JSONObj *obj) {
+
+  JSONDecoder::decode_json("default_zonegroup", default_zonegroup, obj);
+  /* backward compatability with region */
+  if (default_zonegroup.empty()) {
+    JSONDecoder::decode_json("default_region", default_zonegroup, obj);
+  }
+}
+
+rgw_pool RGWZoneGroup::get_pool(CephContext *cct_) const
+{
+  if (cct_->_conf->rgw_zonegroup_root_pool.empty()) {
+    return rgw_pool(RGW_DEFAULT_ZONEGROUP_ROOT_POOL);
+  }
+
+  return rgw_pool(cct_->_conf->rgw_zonegroup_root_pool);
+}
+
+int RGWZoneGroup::create_default(bool old_format)
+{
+  name = default_zonegroup_name;
+  api_name = default_zonegroup_name;
+  is_master = true;
+
+  RGWZoneGroupPlacementTarget placement_target;
+  placement_target.name = "default-placement";
+  placement_targets[placement_target.name] = placement_target;
+  default_placement.name = "default-placement";
+
+  RGWZoneParams zone_params(default_zone_name);
+
+  int r = zone_params.init(cct, sysobj_svc, false);
+  if (r < 0) {
+    ldout(cct, 0) << "create_default: error initializing zone params: " << cpp_strerror(-r) << dendl;
+    return r;
+  }
+
+  r = zone_params.create_default();
+  if (r < 0 && r != -EEXIST) {
+    ldout(cct, 0) << "create_default: error in create_default  zone params: " << cpp_strerror(-r) << dendl;
+    return r;
+  } else if (r == -EEXIST) {
+    ldout(cct, 10) << "zone_params::create_default() returned -EEXIST, we raced with another default zone_params creation" << dendl;
+    zone_params.clear_id();
+    r = zone_params.init(cct, sysobj_svc);
+    if (r < 0) {
+      ldout(cct, 0) << "create_default: error in init existing zone params: " << cpp_strerror(-r) << dendl;
+      return r;
+    }
+    ldout(cct, 20) << "zone_params::create_default() " << zone_params.get_name() << " id " << zone_params.get_id()
+		   << dendl;
+  }
+  
+  RGWZone& default_zone = zones[zone_params.get_id()];
+  default_zone.name = zone_params.get_name();
+  default_zone.id = zone_params.get_id();
+  master_zone = default_zone.id;
+  
+  r = create();
+  if (r < 0 && r != -EEXIST) {
+    ldout(cct, 0) << "error storing zone group info: " << cpp_strerror(-r) << dendl;
+    return r;
+  }
+
+  if (r == -EEXIST) {
+    ldout(cct, 10) << "create_default() returned -EEXIST, we raced with another zonegroup creation" << dendl;
+    id.clear();
+    r = init(cct, sysobj_svc);
+    if (r < 0) {
+      return r;
+    }
+  }
+
+  if (old_format) {
+    name = id;
+  }
+
+  post_process_params();
+
+  return 0;
+}
+
+const string RGWZoneGroup::get_default_oid(bool old_region_format) const
+{
+  if (old_region_format) {
+    if (cct->_conf->rgw_default_region_info_oid.empty()) {
+      return default_region_info_oid;
+    }
+    return cct->_conf->rgw_default_region_info_oid;
+  }
+
+  string default_oid = cct->_conf->rgw_default_zonegroup_info_oid;
+
+  if (cct->_conf->rgw_default_zonegroup_info_oid.empty()) {
+    default_oid = default_zone_group_info_oid;
+  }
+
+  default_oid += "." + realm_id;
+
+  return default_oid;
+}
+
+const string& RGWZoneGroup::get_info_oid_prefix(bool old_region_format) const
+{
+  if (old_region_format) {
+    return region_info_oid_prefix;
+  }
+  return zone_group_info_oid_prefix;
+}
+
+const string& RGWZoneGroup::get_names_oid_prefix() const
+{
+  return zonegroup_names_oid_prefix;
+}
+
+const string& RGWZoneGroup::get_predefined_name(CephContext *cct) const {
+  return cct->_conf->rgw_zonegroup;
+}
+
+int RGWZoneGroup::equals(const string& other_zonegroup) const
+{
+  if (is_master && other_zonegroup.empty())
+    return true;
+
+  return (id  == other_zonegroup);
+}
+
+int RGWZoneGroup::add_zone(const RGWZoneParams& zone_params, bool *is_master, bool *read_only,
+                           const list<string>& endpoints, const string *ptier_type,
+                           bool *psync_from_all, list<string>& sync_from, list<string>& sync_from_rm,
+                           string *predirect_zone, RGWSyncModulesManager *sync_mgr)
+{
+  auto& zone_id = zone_params.get_id();
+  auto& zone_name = zone_params.get_name();
+
+  // check for duplicate zone name on insert
+  if (!zones.count(zone_id)) {
+    for (const auto& zone : zones) {
+      if (zone.second.name == zone_name) {
+        ldout(cct, 0) << "ERROR: found existing zone name " << zone_name
+            << " (" << zone.first << ") in zonegroup " << get_name() << dendl;
+        return -EEXIST;
+      }
+    }
+  }
+
+  if (is_master) {
+    if (*is_master) {
+      if (!master_zone.empty() && master_zone != zone_id) {
+        ldout(cct, 0) << "NOTICE: overriding master zone: " << master_zone << dendl;
+      }
+      master_zone = zone_id;
+    } else if (master_zone == zone_id) {
+      master_zone.clear();
+    }
+  }
+
+  RGWZone& zone = zones[zone_id];
+  zone.name = zone_name;
+  zone.id = zone_id;
+  if (!endpoints.empty()) {
+    zone.endpoints = endpoints;
+  }
+  if (read_only) {
+    zone.read_only = *read_only;
+  }
+  if (ptier_type) {
+    zone.tier_type = *ptier_type;
+    if (!sync_mgr->get_module(*ptier_type, nullptr)) {
+      ldout(cct, 0) << "ERROR: could not found sync module: " << *ptier_type 
+                    << ",  valid sync modules: " 
+                    << sync_mgr->get_registered_module_names()
+                    << dendl;
+      return -ENOENT;
+    }
+  }
+
+  if (psync_from_all) {
+    zone.sync_from_all = *psync_from_all;
+  }
+
+  if (predirect_zone) {
+    zone.redirect_zone = *predirect_zone;
+  }
+
+  for (auto add : sync_from) {
+    zone.sync_from.insert(add);
+  }
+
+  for (auto rm : sync_from_rm) {
+    zone.sync_from.erase(rm);
+  }
+
+  post_process_params();
+
+  return update();
+}
+
+
+int RGWZoneGroup::rename_zone(const RGWZoneParams& zone_params)
+{ 
+  RGWZone& zone = zones[zone_params.get_id()];
+  zone.name = zone_params.get_name();
+  
+  return update();
+}
+
+void RGWZoneGroup::post_process_params()
+{
+  bool log_data = zones.size() > 1;
+
+  if (master_zone.empty()) {
+    map<string, RGWZone>::iterator iter = zones.begin();
+    if (iter != zones.end()) {
+      master_zone = iter->first;
+    }
+  }
+  
+  for (map<string, RGWZone>::iterator iter = zones.begin(); iter != zones.end(); ++iter) {
+    RGWZone& zone = iter->second;
+    zone.log_data = log_data;
+
+    RGWZoneParams zone_params(zone.id, zone.name);
+    int ret = zone_params.init(cct, sysobj_svc);
+    if (ret < 0) {
+      ldout(cct, 0) << "WARNING: could not read zone params for zone id=" << zone.id << " name=" << zone.name << dendl;
+      continue;
+    }
+
+    for (map<string, RGWZonePlacementInfo>::iterator iter = zone_params.placement_pools.begin(); 
+         iter != zone_params.placement_pools.end(); ++iter) {
+      const string& placement_name = iter->first;
+      if (placement_targets.find(placement_name) == placement_targets.end()) {
+        RGWZoneGroupPlacementTarget placement_target;
+        placement_target.name = placement_name;
+        placement_targets[placement_name] = placement_target;
+      }
+    }
+  }
+
+  if (default_placement.empty() && !placement_targets.empty()) {
+    default_placement.init(placement_targets.begin()->first, RGW_STORAGE_CLASS_STANDARD);
+  }
+}
+
+int RGWZoneGroup::remove_zone(const std::string& zone_id)
+{
+  map<string, RGWZone>::iterator iter = zones.find(zone_id);
+  if (iter == zones.end()) {
+    ldout(cct, 0) << "zone id " << zone_id << " is not a part of zonegroup "
+        << name << dendl;
+    return -ENOENT;
+  }
+
+  zones.erase(iter);
+
+  post_process_params();
+
+  return update();
+}
+
+int RGWZoneGroup::read_default_id(string& default_id, bool old_format)
+{
+  if (realm_id.empty()) {
+    /* try using default realm */
+    RGWRealm realm;
+    int ret = realm.init(cct, sysobj_svc);
+    // no default realm exist
+    if (ret < 0) {
+      return read_id(default_zonegroup_name, default_id);
+    }
+    realm_id = realm.get_id();
+  }
+
+  return RGWSystemMetaObj::read_default_id(default_id, old_format);
+}
+
+int RGWZoneGroup::set_as_default(bool exclusive)
+{
+  if (realm_id.empty()) {
+    /* try using default realm */
+    RGWRealm realm;
+    int ret = realm.init(cct, sysobj_svc);
+    if (ret < 0) {
+      ldout(cct, 10) << "could not read realm id: " << cpp_strerror(-ret) << dendl;
+      return -EINVAL;
+    }
+    realm_id = realm.get_id();
+  }
+
+  return RGWSystemMetaObj::set_as_default(exclusive);
+}
+
+void RGWSystemMetaObj::reinit_instance(CephContext *_cct, RGWSI_SysObj *_sysobj_svc)
+{
+  cct = _cct;
+  sysobj_svc = _sysobj_svc;
+  zone_svc = _sysobj_svc->get_zone_svc();
+}
+
+int RGWSystemMetaObj::init(CephContext *_cct, RGWSI_SysObj *_sysobj_svc, bool setup_obj, bool old_format)
+{
+  reinit_instance(_cct, _sysobj_svc);
+
+  if (!setup_obj)
+    return 0;
+
+  if (old_format && id.empty()) {
+    id = name;
+  }
+
+  if (id.empty()) {
+    int r;
+    if (name.empty()) {
+      name = get_predefined_name(cct);
+    }
+    if (name.empty()) {
+      r = use_default(old_format);
+      if (r < 0) {
+	return r;
+      }
+    } else if (!old_format) {
+      r = read_id(name, id);
+      if (r < 0) {
+        if (r != -ENOENT) {
+          ldout(cct, 0) << "error in read_id for object name: " << name << " : " << cpp_strerror(-r) << dendl;
+        }
+        return r;
+      }
+    }
+  }
+
+  return read_info(id, old_format);
+}
+
+int RGWSystemMetaObj::read_default(RGWDefaultSystemMetaObjInfo& default_info, const string& oid)
+{
+  using ceph::decode;
+  auto pool = get_pool(cct);
+  bufferlist bl;
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj(pool, oid));
+  int ret = sysobj.rop().read(&bl);
+  if (ret < 0)
+    return ret;
+
+  try {
+    auto iter = bl.cbegin();
+    decode(default_info, iter);
+  } catch (buffer::error& err) {
+    ldout(cct, 0) << "error decoding data from " << pool << ":" << oid << dendl;
+    return -EIO;
+  }
+
+  return 0;
+}
+
+int RGWSystemMetaObj::read_default_id(string& default_id, bool old_format)
+{
+  RGWDefaultSystemMetaObjInfo default_info;
+
+  int ret = read_default(default_info, get_default_oid(old_format));
+  if (ret < 0) {
+    return ret;
+  }
+
+  default_id = default_info.default_id;
+
+  return 0;
+}
+
+int RGWSystemMetaObj::use_default(bool old_format)
+{
+  return read_default_id(id, old_format);
+}
+
+int RGWSystemMetaObj::set_as_default(bool exclusive)
+{
+  using ceph::encode;
+  string oid  = get_default_oid();
+
+  rgw_pool pool(get_pool(cct));
+  bufferlist bl;
+
+  RGWDefaultSystemMetaObjInfo default_info;
+  default_info.default_id = id;
+
+  encode(default_info, bl);
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj(pool, oid));
+  int ret = sysobj.wop()
+                  .set_exclusive(exclusive)
+		  .write(bl);
+  if (ret < 0)
+    return ret;
+
+  return 0;
+}
+
+int RGWSystemMetaObj::read_id(const string& obj_name, string& object_id)
+{
+  using ceph::decode;
+  rgw_pool pool(get_pool(cct));
+  bufferlist bl;
+
+  string oid = get_names_oid_prefix() + obj_name;
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj(pool, oid));
+  int ret = sysobj.rop().read(&bl);
+  if (ret < 0) {
+    return ret;
+  }
+
+  RGWNameToId nameToId;
+  try {
+    auto iter = bl.cbegin();
+    decode(nameToId, iter);
+  } catch (buffer::error& err) {
+    ldout(cct, 0) << "ERROR: failed to decode obj from " << pool << ":" << oid << dendl;
+    return -EIO;
+  }
+  object_id = nameToId.obj_id;
+  return 0;
+}
+
+int RGWSystemMetaObj::delete_obj(bool old_format)
+{
+  rgw_pool pool(get_pool(cct));
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+
+  /* check to see if obj is the default */
+  RGWDefaultSystemMetaObjInfo default_info;
+  int ret = read_default(default_info, get_default_oid(old_format));
+  if (ret < 0 && ret != -ENOENT)
+    return ret;
+  if (default_info.default_id == id || (old_format && default_info.default_id == name)) {
+    string oid = get_default_oid(old_format);
+    rgw_raw_obj default_named_obj(pool, oid);
+    auto sysobj = sysobj_svc->get_obj(obj_ctx, default_named_obj);
+    ret = sysobj.wop().remove();
+    if (ret < 0) {
+      ldout(cct, 0) << "Error delete default obj name  " << name << ": " << cpp_strerror(-ret) << dendl;
+      return ret;
+    }
+  }
+  if (!old_format) {
+    string oid  = get_names_oid_prefix() + name;
+    rgw_raw_obj object_name(pool, oid);
+    auto sysobj = sysobj_svc->get_obj(obj_ctx, object_name);
+    ret = sysobj.wop().remove();
+    if (ret < 0) {
+      ldout(cct, 0) << "Error delete obj name  " << name << ": " << cpp_strerror(-ret) << dendl;
+      return ret;
+    }
+  }
+
+  string oid = get_info_oid_prefix(old_format);
+  if (old_format) {
+    oid += name;
+  } else {
+    oid += id;
+  }
+
+  rgw_raw_obj object_id(pool, oid);
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, object_id);
+  ret = sysobj.wop().remove();
+  if (ret < 0) {
+    ldout(cct, 0) << "Error delete object id " << id << ": " << cpp_strerror(-ret) << dendl;
+  }
+
+  return ret;
+}
+
+int RGWSystemMetaObj::store_name(bool exclusive)
+{
+  rgw_pool pool(get_pool(cct));
+  string oid = get_names_oid_prefix() + name;
+
+  RGWNameToId nameToId;
+  nameToId.obj_id = id;
+
+  bufferlist bl;
+  using ceph::encode;
+  encode(nameToId, bl);
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj(pool, oid));
+  return sysobj.wop()
+               .set_exclusive(exclusive)
+	       .write(bl);
+}
+
+int RGWSystemMetaObj::rename(const string& new_name)
+{
+  string new_id;
+  int ret = read_id(new_name, new_id);
+  if (!ret) {
+    return -EEXIST;
+  }
+  if (ret < 0 && ret != -ENOENT) {
+    ldout(cct, 0) << "Error read_id " << new_name << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+  string old_name = name;
+  name = new_name;
+  ret = update();
+  if (ret < 0) {
+    ldout(cct, 0) << "Error storing new obj info " << new_name << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+  ret = store_name(true);
+  if (ret < 0) {
+    ldout(cct, 0) << "Error storing new name " << new_name << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+  /* delete old name */
+  rgw_pool pool(get_pool(cct));
+  string oid = get_names_oid_prefix() + old_name;
+  rgw_raw_obj old_name_obj(pool, oid);
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, old_name_obj);
+  ret = sysobj.wop().remove();
+  if (ret < 0) {
+    ldout(cct, 0) << "Error delete old obj name  " << old_name << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  return ret;
+}
+
+int RGWSystemMetaObj::read_info(const string& obj_id, bool old_format)
+{
+  rgw_pool pool(get_pool(cct));
+
+  bufferlist bl;
+
+  string oid = get_info_oid_prefix(old_format) + obj_id;
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, oid});
+  int ret = sysobj.rop().read(&bl);
+  if (ret < 0) {
+    ldout(cct, 0) << "failed reading obj info from " << pool << ":" << oid << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+  using ceph::decode;
+
+  try {
+    auto iter = bl.cbegin();
+    decode(*this, iter);
+  } catch (buffer::error& err) {
+    ldout(cct, 0) << "ERROR: failed to decode obj from " << pool << ":" << oid << dendl;
+    return -EIO;
+  }
+
+  return 0;
+}
+
+int RGWSystemMetaObj::read()
+{
+  int ret = read_id(name, id);
+  if (ret < 0) {
+    return ret;
+  }
+
+  return read_info(id);
+}
+
+int RGWSystemMetaObj::create(bool exclusive)
+{
+  int ret;
+  
+  /* check to see the name is not used */
+  ret = read_id(name, id);
+  if (exclusive && ret == 0) {
+    ldout(cct, 10) << "ERROR: name " << name << " already in use for obj id " << id << dendl;
+    return -EEXIST;
+  } else if ( ret < 0 && ret != -ENOENT) {
+    ldout(cct, 0) << "failed reading obj id  " << id << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  if (id.empty()) {
+    /* create unique id */
+    uuid_d new_uuid;
+    char uuid_str[37];
+    new_uuid.generate_random();
+    new_uuid.print(uuid_str);
+    id = uuid_str;
+  }
+
+  ret = store_info(exclusive);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR:  storing info for " << id << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  return store_name(exclusive);
+}
+
+int RGWSystemMetaObj::store_info(bool exclusive)
+{
+  rgw_pool pool(get_pool(cct));
+
+  string oid = get_info_oid_prefix() + id;
+
+  bufferlist bl;
+  using ceph::encode;
+  encode(*this, bl);
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, oid});
+  return sysobj.wop()
+               .set_exclusive(exclusive)
+	       .write(bl);
+}
+
+int RGWSystemMetaObj::write(bool exclusive)
+{
+  int ret = store_info(exclusive);
+  if (ret < 0) {
+    ldout(cct, 20) << __func__ << "(): store_info() returned ret=" << ret << dendl;
+    return ret;
+  }
+  ret = store_name(exclusive);
+  if (ret < 0) {
+    ldout(cct, 20) << __func__ << "(): store_name() returned ret=" << ret << dendl;
+    return ret;
+  }
+  return 0;
+}
+
+
+const string& RGWRealm::get_predefined_name(CephContext *cct) const {
+  return cct->_conf->rgw_realm;
+}
+
+int RGWRealm::create(bool exclusive)
+{
+  int ret = RGWSystemMetaObj::create(exclusive);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR creating new realm object " << name << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+  // create the control object for watch/notify
+  ret = create_control(exclusive);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR creating control for new realm " << name << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+  RGWPeriod period;
+  if (current_period.empty()) {
+    /* create new period for the realm */
+    ret = period.init(cct, sysobj_svc, id, name, false);
+    if (ret < 0 ) {
+      return ret;
+    }
+    ret = period.create(true);
+    if (ret < 0) {
+      ldout(cct, 0) << "ERROR: creating new period for realm " << name << ": " << cpp_strerror(-ret) << dendl;
+      return ret;
+    }
+  } else {
+    period = RGWPeriod(current_period, 0);
+    int ret = period.init(cct, sysobj_svc, id, name);
+    if (ret < 0) {
+      ldout(cct, 0) << "ERROR: failed to init period " << current_period << dendl;
+      return ret;
+    }
+  }
+  ret = set_current_period(period);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: failed set current period " << current_period << dendl;
+    return ret;
+  }
+  // try to set as default. may race with another create, so pass exclusive=true
+  // so we don't override an existing default
+  ret = set_as_default(true);
+  if (ret < 0 && ret != -EEXIST) {
+    ldout(cct, 0) << "WARNING: failed to set realm as default realm, ret=" << ret << dendl;
+  }
+
+  return 0;
+}
+
+int RGWRealm::delete_obj()
+{
+  int ret = RGWSystemMetaObj::delete_obj();
+  if (ret < 0) {
+    return ret;
+  }
+  return delete_control();
+}
+
+int RGWRealm::create_control(bool exclusive)
+{
+  auto pool = rgw_pool{get_pool(cct)};
+  auto oid = get_control_oid();
+  bufferlist bl;
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, oid});
+  return sysobj.wop()
+               .set_exclusive(exclusive)
+	       .write(bl);
+}
+
+int RGWRealm::delete_control()
+{
+  auto pool = rgw_pool{get_pool(cct)};
+  auto obj = rgw_raw_obj{pool, get_control_oid()};
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, obj);
+  return sysobj.wop().remove();
+}
+
+rgw_pool RGWRealm::get_pool(CephContext *cct) const
+{
+  if (cct->_conf->rgw_realm_root_pool.empty()) {
+    return rgw_pool(RGW_DEFAULT_REALM_ROOT_POOL);
+  }
+  return rgw_pool(cct->_conf->rgw_realm_root_pool);
+}
+
+const string RGWRealm::get_default_oid(bool old_format) const
+{
+  if (cct->_conf->rgw_default_realm_info_oid.empty()) {
+    return default_realm_info_oid;
+  }
+  return cct->_conf->rgw_default_realm_info_oid;
+}
+
+const string& RGWRealm::get_names_oid_prefix() const
+{
+  return realm_names_oid_prefix;
+}
+
+const string& RGWRealm::get_info_oid_prefix(bool old_format) const
+{
+  return realm_info_oid_prefix;
+}
+
+int RGWRealm::set_current_period(RGWPeriod& period)
+{
+  // update realm epoch to match the period's
+  if (epoch > period.get_realm_epoch()) {
+    ldout(cct, 0) << "ERROR: set_current_period with old realm epoch "
+        << period.get_realm_epoch() << ", current epoch=" << epoch << dendl;
+    return -EINVAL;
+  }
+  if (epoch == period.get_realm_epoch() && current_period != period.get_id()) {
+    ldout(cct, 0) << "ERROR: set_current_period with same realm epoch "
+        << period.get_realm_epoch() << ", but different period id "
+        << period.get_id() << " != " << current_period << dendl;
+    return -EINVAL;
+  }
+
+  epoch = period.get_realm_epoch();
+  current_period = period.get_id();
+
+  int ret = update();
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: period update: " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  ret = period.reflect();
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: period.reflect(): " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  return 0;
+}
+
+string RGWRealm::get_control_oid() const
+{
+  return get_info_oid_prefix() + id + ".control";
+}
+
+int RGWRealm::notify_zone(bufferlist& bl)
+{
+  rgw_pool pool{get_pool(cct)};
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, get_control_oid()});
+  int ret = sysobj.wn().notify(bl, 0, nullptr);
+  if (ret < 0) {
+    return ret;
+  }
+  return 0;
+}
+
+int RGWRealm::notify_new_period(const RGWPeriod& period)
+{
+  bufferlist bl;
+  using ceph::encode;
+  // push the period to dependent zonegroups/zones
+  encode(RGWRealmNotify::ZonesNeedPeriod, bl);
+  encode(period, bl);
+  // reload the gateway with the new period
+  encode(RGWRealmNotify::Reload, bl);
+
+  return notify_zone(bl);
+}
+
+std::string RGWPeriodConfig::get_oid(const std::string& realm_id)
+{
+  if (realm_id.empty()) {
+    return "period_config.default";
+  }
+  return "period_config." + realm_id;
+}
+
+rgw_pool RGWPeriodConfig::get_pool(CephContext *cct)
+{
+  const auto& pool_name = cct->_conf->rgw_period_root_pool;
+  if (pool_name.empty()) {
+    return {RGW_DEFAULT_PERIOD_ROOT_POOL};
+  }
+  return {pool_name};
+}
+
+int RGWPeriodConfig::read(RGWSI_SysObj *sysobj_svc, const std::string& realm_id)
+{
+  const auto& pool = get_pool(sysobj_svc->ctx());
+  const auto& oid = get_oid(realm_id);
+  bufferlist bl;
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, oid});
+  int ret = sysobj.rop().read(&bl);
+  if (ret < 0) {
+    return ret;
+  }
+  using ceph::decode;
+  try {
+    auto iter = bl.cbegin();
+    decode(*this, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  return 0;
+}
+
+int RGWPeriodConfig::write(RGWSI_SysObj *sysobj_svc, const std::string& realm_id)
+{
+  const auto& pool = get_pool(sysobj_svc->ctx());
+  const auto& oid = get_oid(realm_id);
+  bufferlist bl;
+  using ceph::encode;
+  encode(*this, bl);
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, oid});
+  return sysobj.wop()
+               .set_exclusive(false)
+	       .write(bl);
+}
+
+int RGWPeriod::init(CephContext *_cct, RGWSI_SysObj *_sysobj_svc, const string& period_realm_id,
+		    const string& period_realm_name, bool setup_obj)
+{
+  cct = _cct;
+  sysobj_svc = _sysobj_svc;
+
+  realm_id = period_realm_id;
+  realm_name = period_realm_name;
+
+  if (!setup_obj)
+    return 0;
+
+  return init(_cct, _sysobj_svc, setup_obj);
+}
+
+
+int RGWPeriod::init(CephContext *_cct, RGWSI_SysObj *_sysobj_svc, bool setup_obj)
+{
+  cct = _cct;
+  sysobj_svc = _sysobj_svc;
+
+  if (!setup_obj)
+    return 0;
+
+  if (id.empty()) {
+    RGWRealm realm(realm_id, realm_name);
+    int ret = realm.init(cct, sysobj_svc);
+    if (ret < 0) {
+      ldout(cct, 0) << "RGWPeriod::init failed to init realm " << realm_name  << " id " << realm_id << " : " <<
+	cpp_strerror(-ret) << dendl;
+      return ret;
+    }
+    id = realm.get_current_period();
+    realm_id = realm.get_id();
+  }
+
+  if (!epoch) {
+    int ret = use_latest_epoch();
+    if (ret < 0) {
+      ldout(cct, 0) << "failed to use_latest_epoch period id " << id << " realm " << realm_name  << " id " << realm_id
+	   << " : " << cpp_strerror(-ret) << dendl;
+      return ret;
+    }
+  }
+
+  return read_info();
+}
+
+
+int RGWPeriod::get_zonegroup(RGWZoneGroup& zonegroup,
+                             const string& zonegroup_id) const
+{
+  map<string, RGWZoneGroup>::const_iterator iter;
+  if (!zonegroup_id.empty()) {
+    iter = period_map.zonegroups.find(zonegroup_id);
+  } else {
+    iter = period_map.zonegroups.find("default");
+  }
+  if (iter != period_map.zonegroups.end()) {
+    zonegroup = iter->second;
+    return 0;
+  }
+
+  return -ENOENT;
+}
+
+const string& RGWPeriod::get_latest_epoch_oid() const
+{
+  if (cct->_conf->rgw_period_latest_epoch_info_oid.empty()) {
+    return period_latest_epoch_info_oid;
+  }
+  return cct->_conf->rgw_period_latest_epoch_info_oid;
+}
+
+const string& RGWPeriod::get_info_oid_prefix() const
+{
+  return period_info_oid_prefix;
+}
+
+const string RGWPeriod::get_period_oid_prefix() const
+{
+  return get_info_oid_prefix() + id;
+}
+
+const string RGWPeriod::get_period_oid() const
+{
+  std::ostringstream oss;
+  oss << get_period_oid_prefix();
+  // skip the epoch for the staging period
+  if (id != get_staging_id(realm_id))
+    oss << "." << epoch;
+  return oss.str();
+}
+
+int RGWPeriod::read_latest_epoch(RGWPeriodLatestEpochInfo& info,
+                                 RGWObjVersionTracker *objv)
+{
+  string oid = get_period_oid_prefix() + get_latest_epoch_oid();
+
+  rgw_pool pool(get_pool(cct));
+  bufferlist bl;
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, oid});
+  int ret = sysobj.rop().read(&bl);
+  if (ret < 0) {
+    ldout(cct, 1) << "error read_lastest_epoch " << pool << ":" << oid << dendl;
+    return ret;
+  }
+  try {
+    auto iter = bl.cbegin();
+    using ceph::decode;
+    decode(info, iter);
+  } catch (buffer::error& err) {
+    ldout(cct, 0) << "error decoding data from " << pool << ":" << oid << dendl;
+    return -EIO;
+  }
+
+  return 0;
+}
+
+int RGWPeriod::get_latest_epoch(epoch_t& latest_epoch)
+{
+  RGWPeriodLatestEpochInfo info;
+
+  int ret = read_latest_epoch(info);
+  if (ret < 0) {
+    return ret;
+  }
+
+  latest_epoch = info.epoch;
+
+  return 0;
+}
+
+int RGWPeriod::use_latest_epoch()
+{
+  RGWPeriodLatestEpochInfo info;
+  int ret = read_latest_epoch(info);
+  if (ret < 0) {
+    return ret;
+  }
+
+  epoch = info.epoch;
+
+  return 0;
+}
+
+int RGWPeriod::set_latest_epoch(epoch_t epoch, bool exclusive,
+                                RGWObjVersionTracker *objv)
+{
+  string oid = get_period_oid_prefix() + get_latest_epoch_oid();
+
+  rgw_pool pool(get_pool(cct));
+  bufferlist bl;
+
+  RGWPeriodLatestEpochInfo info;
+  info.epoch = epoch;
+
+  using ceph::encode;
+  encode(info, bl);
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj(pool, oid));
+  return sysobj.wop()
+               .set_exclusive(exclusive)
+               .write(bl);
+}
+
+int RGWPeriod::update_latest_epoch(epoch_t epoch)
+{
+  static constexpr int MAX_RETRIES = 20;
+
+  for (int i = 0; i < MAX_RETRIES; i++) {
+    RGWPeriodLatestEpochInfo info;
+    RGWObjVersionTracker objv;
+    bool exclusive = false;
+
+    // read existing epoch
+    int r = read_latest_epoch(info, &objv);
+    if (r == -ENOENT) {
+      // use an exclusive create to set the epoch atomically
+      exclusive = true;
+      ldout(cct, 20) << "creating initial latest_epoch=" << epoch
+          << " for period=" << id << dendl;
+    } else if (r < 0) {
+      ldout(cct, 0) << "ERROR: failed to read latest_epoch" << dendl;
+      return r;
+    } else if (epoch <= info.epoch) {
+      r = -EEXIST; // fail with EEXIST if epoch is not newer
+      ldout(cct, 10) << "found existing latest_epoch " << info.epoch
+          << " >= given epoch " << epoch << ", returning r=" << r << dendl;
+      return r;
+    } else {
+      ldout(cct, 20) << "updating latest_epoch from " << info.epoch
+          << " -> " << epoch << " on period=" << id << dendl;
+    }
+
+    r = set_latest_epoch(epoch, exclusive, &objv);
+    if (r == -EEXIST) {
+      continue; // exclusive create raced with another update, retry
+    } else if (r == -ECANCELED) {
+      continue; // write raced with a conflicting version, retry
+    }
+    if (r < 0) {
+      ldout(cct, 0) << "ERROR: failed to write latest_epoch" << dendl;
+      return r;
+    }
+    return 0; // return success
+  }
+
+  return -ECANCELED; // fail after max retries
+}
+
+int RGWPeriod::delete_obj()
+{
+  rgw_pool pool(get_pool(cct));
+
+  // delete the object for each period epoch
+  for (epoch_t e = 1; e <= epoch; e++) {
+    RGWPeriod p{get_id(), e};
+    rgw_raw_obj oid{pool, p.get_period_oid()};
+    auto obj_ctx = sysobj_svc->init_obj_ctx();
+    auto sysobj = sysobj_svc->get_obj(obj_ctx, oid);
+    int ret = sysobj.wop().remove();
+    if (ret < 0) {
+      ldout(cct, 0) << "WARNING: failed to delete period object " << oid
+          << ": " << cpp_strerror(-ret) << dendl;
+    }
+  }
+
+  // delete the .latest_epoch object
+  rgw_raw_obj oid{pool, get_period_oid_prefix() + get_latest_epoch_oid()};
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, oid);
+  int ret = sysobj.wop().remove();
+  if (ret < 0) {
+    ldout(cct, 0) << "WARNING: failed to delete period object " << oid
+        << ": " << cpp_strerror(-ret) << dendl;
+  }
+  return ret;
+}
+
+int RGWPeriod::read_info()
+{
+  rgw_pool pool(get_pool(cct));
+
+  bufferlist bl;
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj{pool, get_period_oid()});
+  int ret = sysobj.rop().read(&bl);
+  if (ret < 0) {
+    ldout(cct, 0) << "failed reading obj info from " << pool << ":" << get_period_oid() << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  try {
+    using ceph::decode;
+    auto iter = bl.cbegin();
+    decode(*this, iter);
+  } catch (buffer::error& err) {
+    ldout(cct, 0) << "ERROR: failed to decode obj from " << pool << ":" << get_period_oid() << dendl;
+    return -EIO;
+  }
+
+  return 0;
+}
+
+int RGWPeriod::create(bool exclusive)
+{
+  int ret;
+  
+  /* create unique id */
+  uuid_d new_uuid;
+  char uuid_str[37];
+  new_uuid.generate_random();
+  new_uuid.print(uuid_str);
+  id = uuid_str;
+
+  epoch = FIRST_EPOCH;
+
+  period_map.id = id;
+  
+  ret = store_info(exclusive);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR:  storing info for " << id << ": " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  ret = set_latest_epoch(epoch);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: setting latest epoch " << id << ": " << cpp_strerror(-ret) << dendl;
+  }
+
+  return ret;
+}
+
+int RGWPeriod::store_info(bool exclusive)
+{
+  rgw_pool pool(get_pool(cct));
+
+  string oid = get_period_oid();
+  bufferlist bl;
+  using ceph::encode;
+  encode(*this, bl);
+
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, rgw_raw_obj(pool, oid));
+  return sysobj.wop()
+               .set_exclusive(exclusive)
+               .write(bl);
+}
+
+rgw_pool RGWPeriod::get_pool(CephContext *cct) const
+{
+  if (cct->_conf->rgw_period_root_pool.empty()) {
+    return rgw_pool(RGW_DEFAULT_PERIOD_ROOT_POOL);
+  }
+  return rgw_pool(cct->_conf->rgw_period_root_pool);
+}
+
+int RGWPeriod::add_zonegroup(const RGWZoneGroup& zonegroup)
+{
+  if (zonegroup.realm_id != realm_id) {
+    return 0;
+  }
+  int ret = period_map.update(zonegroup, cct);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: updating period map: " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  return store_info(false);
+}
+
+int RGWPeriod::update()
+{
+  auto zone_svc = sysobj_svc->get_zone_svc();
+  ldout(cct, 20) << __func__ << " realm " << realm_id << " period " << get_id() << dendl;
+  list<string> zonegroups;
+  int ret = zone_svc->list_zonegroups(zonegroups);
+  if (ret < 0) {
+    ldout(cct, 0) << "ERROR: failed to list zonegroups: " << cpp_strerror(-ret) << dendl;
+    return ret;
+  }
+
+  // clear zone short ids of removed zones. period_map.update() will add the
+  // remaining zones back
+  period_map.short_zone_ids.clear();
+
+  for (auto& iter : zonegroups) {
+    RGWZoneGroup zg(string(), iter);
+    ret = zg.init(cct, sysobj_svc);
+    if (ret < 0) {
+      ldout(cct, 0) << "WARNING: zg.init() failed: " << cpp_strerror(-ret) << dendl;
+      continue;
+    }
+
+    if (zg.realm_id != realm_id) {
+      ldout(cct, 20) << "skipping zonegroup " << zg.get_name() << " zone realm id " << zg.realm_id << ", not on our realm " << realm_id << dendl;
+      continue;
+    }
+
+    if (zg.master_zone.empty()) {
+      ldout(cct, 0) << "ERROR: zonegroup " << zg.get_name() << " should have a master zone " << dendl;
+      return -EINVAL;
+    }
+
+    if (zg.zones.find(zg.master_zone) == zg.zones.end()) {
+      ldout(cct,0) << "ERROR: zonegroup " << zg.get_name()
+                   << " has a non existent master zone "<< dendl;
+      return -EINVAL;
+    }
+
+    if (zg.is_master_zonegroup()) {
+      master_zonegroup = zg.get_id();
+      master_zone = zg.master_zone;
+    }
+
+    int ret = period_map.update(zg, cct);
+    if (ret < 0) {
+      return ret;
+    }
+  }
+
+  ret = period_config.read(sysobj_svc, realm_id);
+  if (ret < 0 && ret != -ENOENT) {
+    ldout(cct, 0) << "ERROR: failed to read period config: "
+        << cpp_strerror(ret) << dendl;
+    return ret;
+  }
+  return 0;
+}
+
+int RGWPeriod::reflect()
+{
+  for (auto& iter : period_map.zonegroups) {
+    RGWZoneGroup& zg = iter.second;
+    zg.reinit_instance(cct, sysobj_svc);
+    int r = zg.write(false);
+    if (r < 0) {
+      ldout(cct, 0) << "ERROR: failed to store zonegroup info for zonegroup=" << iter.first << ": " << cpp_strerror(-r) << dendl;
+      return r;
+    }
+    if (zg.is_master_zonegroup()) {
+      // set master as default if no default exists
+      r = zg.set_as_default(true);
+      if (r == 0) {
+        ldout(cct, 1) << "Set the period's master zonegroup " << zg.get_id()
+            << " as the default" << dendl;
+      }
+    }
+  }
+
+  int r = period_config.write(sysobj_svc, realm_id);
+  if (r < 0) {
+    ldout(cct, 0) << "ERROR: failed to store period config: "
+        << cpp_strerror(-r) << dendl;
+    return r;
+  }
+  return 0;
+}
+
+void RGWPeriod::fork()
+{
+  ldout(cct, 20) << __func__ << " realm " << realm_id << " period " << id << dendl;
+  predecessor_uuid = id;
+  id = get_staging_id(realm_id);
+  period_map.reset();
+  realm_epoch++;
+}
+
+static int read_sync_status(RGWRados *store, rgw_meta_sync_status *sync_status)
+{
+  // initialize a sync status manager to read the status
+  RGWMetaSyncStatusManager mgr(store, store->get_async_rados());
+  int r = mgr.init();
+  if (r < 0) {
+    return r;
+  }
+  r = mgr.read_sync_status(sync_status);
+  mgr.stop();
+  return r;
+}
+
+int RGWPeriod::update_sync_status(RGWRados *store, /* for now */
+				  const RGWPeriod &current_period,
+                                  std::ostream& error_stream,
+                                  bool force_if_stale)
+{
+  rgw_meta_sync_status status;
+  int r = read_sync_status(store, &status);
+  if (r < 0) {
+    ldout(cct, 0) << "period failed to read sync status: "
+        << cpp_strerror(-r) << dendl;
+    return r;
+  }
+
+  std::vector<std::string> markers;
+
+  const auto current_epoch = current_period.get_realm_epoch();
+  if (current_epoch != status.sync_info.realm_epoch) {
+    // no sync status markers for the current period
+    ceph_assert(current_epoch > status.sync_info.realm_epoch);
+    const int behind = current_epoch - status.sync_info.realm_epoch;
+    if (!force_if_stale && current_epoch > 1) {
+      error_stream << "ERROR: This zone is " << behind << " period(s) behind "
+          "the current master zone in metadata sync. If this zone is promoted "
+          "to master, any metadata changes during that time are likely to "
+          "be lost.\n"
+          "Waiting for this zone to catch up on metadata sync (see "
+          "'radosgw-admin sync status') is recommended.\n"
+          "To promote this zone to master anyway, add the flag "
+          "--yes-i-really-mean-it." << std::endl;
+      return -EINVAL;
+    }
+    // empty sync status markers - other zones will skip this period during
+    // incremental metadata sync
+    markers.resize(status.sync_info.num_shards);
+  } else {
+    markers.reserve(status.sync_info.num_shards);
+    for (auto& i : status.sync_markers) {
+      auto& marker = i.second;
+      // filter out markers from other periods
+      if (marker.realm_epoch != current_epoch) {
+        marker.marker.clear();
+      }
+      markers.emplace_back(std::move(marker.marker));
+    }
+  }
+
+  std::swap(sync_status, markers);
+  return 0;
+}
+
+int RGWPeriod::commit(RGWRados *store,
+		      RGWRealm& realm, const RGWPeriod& current_period,
+                      std::ostream& error_stream, bool force_if_stale)
+{
+  auto zone_svc = sysobj_svc->get_zone_svc();
+  ldout(cct, 20) << __func__ << " realm " << realm.get_id() << " period " << current_period.get_id() << dendl;
+  // gateway must be in the master zone to commit
+  if (master_zone != zone_svc->get_zone_params().get_id()) {
+    error_stream << "Cannot commit period on zone "
+        << zone_svc->get_zone_params().get_id() << ", it must be sent to "
+        "the period's master zone " << master_zone << '.' << std::endl;
+    return -EINVAL;
+  }
+  // period predecessor must match current period
+  if (predecessor_uuid != current_period.get_id()) {
+    error_stream << "Period predecessor " << predecessor_uuid
+        << " does not match current period " << current_period.get_id()
+        << ". Use 'period pull' to get the latest period from the master, "
+        "reapply your changes, and try again." << std::endl;
+    return -EINVAL;
+  }
+  // realm epoch must be 1 greater than current period
+  if (realm_epoch != current_period.get_realm_epoch() + 1) {
+    error_stream << "Period's realm epoch " << realm_epoch
+        << " does not come directly after current realm epoch "
+        << current_period.get_realm_epoch() << ". Use 'realm pull' to get the "
+        "latest realm and period from the master zone, reapply your changes, "
+        "and try again." << std::endl;
+    return -EINVAL;
+  }
+  // did the master zone change?
+  if (master_zone != current_period.get_master_zone()) {
+    // store the current metadata sync status in the period
+    int r = update_sync_status(store, current_period, error_stream, force_if_stale);
+    if (r < 0) {
+      ldout(cct, 0) << "failed to update metadata sync status: "
+          << cpp_strerror(-r) << dendl;
+      return r;
+    }
+    // create an object with a new period id
+    r = create(true);
+    if (r < 0) {
+      ldout(cct, 0) << "failed to create new period: " << cpp_strerror(-r) << dendl;
+      return r;
+    }
+    // set as current period
+    r = realm.set_current_period(*this);
+    if (r < 0) {
+      ldout(cct, 0) << "failed to update realm's current period: "
+          << cpp_strerror(-r) << dendl;
+      return r;
+    }
+    ldout(cct, 4) << "Promoted to master zone and committed new period "
+        << id << dendl;
+    realm.notify_new_period(*this);
+    return 0;
+  }
+  // period must be based on current epoch
+  if (epoch != current_period.get_epoch()) {
+    error_stream << "Period epoch " << epoch << " does not match "
+        "predecessor epoch " << current_period.get_epoch()
+        << ". Use 'period pull' to get the latest epoch from the master zone, "
+        "reapply your changes, and try again." << std::endl;
+    return -EINVAL;
+  }
+  // set period as next epoch
+  set_id(current_period.get_id());
+  set_epoch(current_period.get_epoch() + 1);
+  set_predecessor(current_period.get_predecessor());
+  realm_epoch = current_period.get_realm_epoch();
+  // write the period to rados
+  int r = store_info(false);
+  if (r < 0) {
+    ldout(cct, 0) << "failed to store period: " << cpp_strerror(-r) << dendl;
+    return r;
+  }
+  // set as latest epoch
+  r = update_latest_epoch(epoch);
+  if (r == -EEXIST) {
+    // already have this epoch (or a more recent one)
+    return 0;
+  }
+  if (r < 0) {
+    ldout(cct, 0) << "failed to set latest epoch: " << cpp_strerror(-r) << dendl;
+    return r;
+  }
+  r = reflect();
+  if (r < 0) {
+    ldout(cct, 0) << "failed to update local objects: " << cpp_strerror(-r) << dendl;
+    return r;
+  }
+  ldout(cct, 4) << "Committed new epoch " << epoch
+      << " for period " << id << dendl;
+  realm.notify_new_period(*this);
+  return 0;
+}
+
+int RGWZoneParams::create_default(bool old_format)
+{
+  name = default_zone_name;
+
+  int r = create();
+  if (r < 0) {
+    return r;
+  }
+
+  if (old_format) {
+    name = id;
+  }
+
+  return r;
+}
+
+
+int get_zones_pool_set(CephContext* cct,
+                       RGWSI_SysObj* sysobj_svc,
+                       const list<string>& zones,
+                       const string& my_zone_id,
+                       set<rgw_pool>& pool_names)
+{
+  for(auto const& iter : zones) {
+    RGWZoneParams zone(iter);
+    int r = zone.init(cct, sysobj_svc);
+    if (r < 0) {
+      ldout(cct, 0) << "Error: init zone " << iter << ":" << cpp_strerror(-r) << dendl;
+      return r;
+    }
+    if (zone.get_id() != my_zone_id) {
+      pool_names.insert(zone.domain_root);
+      pool_names.insert(zone.metadata_heap);
+      pool_names.insert(zone.control_pool);
+      pool_names.insert(zone.gc_pool);
+      pool_names.insert(zone.log_pool);
+      pool_names.insert(zone.intent_log_pool);
+      pool_names.insert(zone.usage_log_pool);
+      pool_names.insert(zone.user_keys_pool);
+      pool_names.insert(zone.user_email_pool);
+      pool_names.insert(zone.user_swift_pool);
+      pool_names.insert(zone.user_uid_pool);
+      pool_names.insert(zone.otp_pool);
+      pool_names.insert(zone.roles_pool);
+      pool_names.insert(zone.reshard_pool);
+      for(auto& iter : zone.placement_pools) {
+	pool_names.insert(iter.second.index_pool);
+        for (auto& pi : iter.second.storage_classes.get_all()) {
+          if (pi.second.data_pool) {
+            pool_names.insert(pi.second.data_pool.get());
+          }
+        }
+	pool_names.insert(iter.second.data_extra_pool);
+      }
+    }
+  }
+  return 0;
+}
+
+rgw_pool fix_zone_pool_dup(set<rgw_pool> pools,
+                           const string& default_prefix,
+                           const string& default_suffix,
+                           const rgw_pool& suggested_pool)
+{
+  string suggested_name = suggested_pool.to_str();
+
+  string prefix = default_prefix;
+  string suffix = default_suffix;
+
+  if (!suggested_pool.empty()) {
+    prefix = suggested_name.substr(0, suggested_name.find("."));
+    suffix = suggested_name.substr(prefix.length());
+  }
+
+  rgw_pool pool(prefix + suffix);
+  
+  if (pools.find(pool) == pools.end()) {
+    return pool;
+  } else {
+    while(true) {
+      pool =  prefix + "_" + std::to_string(std::rand()) + suffix;
+      if (pools.find(pool) == pools.end()) {
+	return pool;
+      }
+    }
+  }  
+}
+
+int RGWZoneParams::fix_pool_names()
+{
+
+  list<string> zones;
+  int r = zone_svc->list_zones(zones);
+  if (r < 0) {
+    ldout(cct, 10) << "WARNING: store->list_zones() returned r=" << r << dendl;
+  }
+
+  set<rgw_pool> pools;
+  r = get_zones_pool_set(cct, sysobj_svc, zones, id, pools);
+  if (r < 0) {
+    ldout(cct, 0) << "Error: get_zones_pool_names" << r << dendl;
+    return r;
+  }
+
+  domain_root = fix_zone_pool_dup(pools, name, ".rgw.meta:root", domain_root);
+  if (!metadata_heap.name.empty()) {
+    metadata_heap = fix_zone_pool_dup(pools, name, ".rgw.meta:heap", metadata_heap);
+  }
+  control_pool = fix_zone_pool_dup(pools, name, ".rgw.control", control_pool);
+  gc_pool = fix_zone_pool_dup(pools, name ,".rgw.log:gc", gc_pool);
+  lc_pool = fix_zone_pool_dup(pools, name ,".rgw.log:lc", lc_pool);
+  log_pool = fix_zone_pool_dup(pools, name, ".rgw.log", log_pool);
+  intent_log_pool = fix_zone_pool_dup(pools, name, ".rgw.log:intent", intent_log_pool);
+  usage_log_pool = fix_zone_pool_dup(pools, name, ".rgw.log:usage", usage_log_pool);
+  user_keys_pool = fix_zone_pool_dup(pools, name, ".rgw.meta:users.keys", user_keys_pool);
+  user_email_pool = fix_zone_pool_dup(pools, name, ".rgw.meta:users.email", user_email_pool);
+  user_swift_pool = fix_zone_pool_dup(pools, name, ".rgw.meta:users.swift", user_swift_pool);
+  user_uid_pool = fix_zone_pool_dup(pools, name, ".rgw.meta:users.uid", user_uid_pool);
+  roles_pool = fix_zone_pool_dup(pools, name, ".rgw.meta:roles", roles_pool);
+  reshard_pool = fix_zone_pool_dup(pools, name, ".rgw.log:reshard", reshard_pool);
+  otp_pool = fix_zone_pool_dup(pools, name, ".rgw.otp", otp_pool);
+
+  for(auto& iter : placement_pools) {
+    iter.second.index_pool = fix_zone_pool_dup(pools, name, "." + default_bucket_index_pool_suffix,
+                                               iter.second.index_pool);
+    for (auto& pi : iter.second.storage_classes.get_all()) {
+      if (pi.second.data_pool) {
+        rgw_pool& pool = pi.second.data_pool.get();
+        pool = fix_zone_pool_dup(pools, name, "." + default_storage_pool_suffix,
+                                 pool);
+      }
+    }
+    iter.second.data_extra_pool= fix_zone_pool_dup(pools, name, "." + default_storage_extra_pool_suffix,
+                                                   iter.second.data_extra_pool);
+  }
+
+  return 0;
+}
+
+int RGWZoneParams::create(bool exclusive)
+{
+  /* check for old pools config */
+  rgw_raw_obj obj(domain_root, avail_pools);
+  auto obj_ctx = sysobj_svc->init_obj_ctx();
+  auto sysobj = sysobj_svc->get_obj(obj_ctx, obj);
+  int r = sysobj.rop().stat();
+  if (r < 0) {
+    ldout(cct, 10) << "couldn't find old data placement pools config, setting up new ones for the zone" << dendl;
+    /* a new system, let's set new placement info */
+    RGWZonePlacementInfo default_placement;
+    default_placement.index_pool = name + "." + default_bucket_index_pool_suffix;
+    rgw_pool pool = name + "." + default_storage_pool_suffix;
+    default_placement.storage_classes.set_storage_class(RGW_STORAGE_CLASS_STANDARD, &pool, nullptr);
+    default_placement.data_extra_pool = name + "." + default_storage_extra_pool_suffix;
+    placement_pools["default-placement"] = default_placement;
+  }
+
+  r = fix_pool_names();
+  if (r < 0) {
+    ldout(cct, 0) << "ERROR: fix_pool_names returned r=" << r << dendl;
+    return r;
+  }
+
+  r = RGWSystemMetaObj::create(exclusive);
+  if (r < 0) {
+    return r;
+  }
+
+  // try to set as default. may race with another create, so pass exclusive=true
+  // so we don't override an existing default
+  r = set_as_default(true);
+  if (r < 0 && r != -EEXIST) {
+    ldout(cct, 10) << "WARNING: failed to set zone as default, r=" << r << dendl;
+  }
+
+  return 0;
+}
+
+rgw_pool RGWZoneParams::get_pool(CephContext *cct) const
+{
+  if (cct->_conf->rgw_zone_root_pool.empty()) {
+    return rgw_pool(RGW_DEFAULT_ZONE_ROOT_POOL);
+  }
+
+  return rgw_pool(cct->_conf->rgw_zone_root_pool);
+}
+
+const string RGWZoneParams::get_default_oid(bool old_format) const
+{
+  if (old_format) {
+    return cct->_conf->rgw_default_zone_info_oid;
+  }
+
+  return cct->_conf->rgw_default_zone_info_oid + "." + realm_id;
+}
+
+const string& RGWZoneParams::get_names_oid_prefix() const
+{
+  return zone_names_oid_prefix;
+}
+
+const string& RGWZoneParams::get_info_oid_prefix(bool old_format) const
+{
+  return zone_info_oid_prefix;
+}
+
+const string& RGWZoneParams::get_predefined_name(CephContext *cct) const {
+  return cct->_conf->rgw_zone;
+}
+
+int RGWZoneParams::init(CephContext *cct, RGWSI_SysObj *sysobj_svc, bool setup_obj, bool old_format)
+{
+  if (name.empty()) {
+    name = cct->_conf->rgw_zone;
+  }
+
+  return RGWSystemMetaObj::init(cct, sysobj_svc, setup_obj, old_format);
+}
+
+int RGWZoneParams::read_default_id(string& default_id, bool old_format)
+{
+  if (realm_id.empty()) {
+    /* try using default realm */
+    RGWRealm realm;
+    int ret = realm.init(cct, sysobj_svc);
+    //no default realm exist
+    if (ret < 0) {
+      return read_id(default_zone_name, default_id);
+    }
+    realm_id = realm.get_id();
+  }
+
+  return RGWSystemMetaObj::read_default_id(default_id, old_format);
+}
+
+
+int RGWZoneParams::set_as_default(bool exclusive)
+{
+  if (realm_id.empty()) {
+    /* try using default realm */
+    RGWRealm realm;
+    int ret = realm.init(cct, sysobj_svc);
+    if (ret < 0) {
+      ldout(cct, 10) << "could not read realm id: " << cpp_strerror(-ret) << dendl;
+      return -EINVAL;
+    }
+    realm_id = realm.get_id();
+  }
+
+  return RGWSystemMetaObj::set_as_default(exclusive);
+}
+
+const string& RGWZoneParams::get_compression_type(const rgw_placement_rule& placement_rule) const
+{
+  static const std::string NONE{"none"};
+  auto p = placement_pools.find(placement_rule.name);
+  if (p == placement_pools.end()) {
+    return NONE;
+  }
+  const auto& type = p->second.get_compression_type(placement_rule.get_storage_class());
+  return !type.empty() ? type : NONE;
+}
+
+void RGWPeriodMap::encode(bufferlist& bl) const {
+  ENCODE_START(2, 1, bl);
+  encode(id, bl);
+  encode(zonegroups, bl);
+  encode(master_zonegroup, bl);
+  encode(short_zone_ids, bl);
+  ENCODE_FINISH(bl);
+}
+
+void RGWPeriodMap::decode(bufferlist::const_iterator& bl) {
+  DECODE_START(2, bl);
+  decode(id, bl);
+  decode(zonegroups, bl);
+  decode(master_zonegroup, bl);
+  if (struct_v >= 2) {
+    decode(short_zone_ids, bl);
+  }
+  DECODE_FINISH(bl);
+
+  zonegroups_by_api.clear();
+  for (map<string, RGWZoneGroup>::iterator iter = zonegroups.begin();
+       iter != zonegroups.end(); ++iter) {
+    RGWZoneGroup& zonegroup = iter->second;
+    zonegroups_by_api[zonegroup.api_name] = zonegroup;
+    if (zonegroup.is_master_zonegroup()) {
+      master_zonegroup = zonegroup.get_id();
+    }
+  }
+}
+
+// run an MD5 hash on the zone_id and return the first 32 bits
+static uint32_t gen_short_zone_id(const std::string zone_id)
+{
+  unsigned char md5[CEPH_CRYPTO_MD5_DIGESTSIZE];
+  MD5 hash;
+  hash.Update((const unsigned char *)zone_id.c_str(), zone_id.size());
+  hash.Final(md5);
+
+  uint32_t short_id;
+  memcpy((char *)&short_id, md5, sizeof(short_id));
+  return std::max(short_id, 1u);
+}
+
+int RGWPeriodMap::update(const RGWZoneGroup& zonegroup, CephContext *cct)
+{
+  if (zonegroup.is_master_zonegroup() && (!master_zonegroup.empty() && zonegroup.get_id() != master_zonegroup)) {
+    ldout(cct,0) << "Error updating periodmap, multiple master zonegroups configured "<< dendl;
+    ldout(cct,0) << "master zonegroup: " << master_zonegroup << " and  " << zonegroup.get_id() <<dendl;
+    return -EINVAL;
+  }
+  map<string, RGWZoneGroup>::iterator iter = zonegroups.find(zonegroup.get_id());
+  if (iter != zonegroups.end()) {
+    RGWZoneGroup& old_zonegroup = iter->second;
+    if (!old_zonegroup.api_name.empty()) {
+      zonegroups_by_api.erase(old_zonegroup.api_name);
+    }
+  }
+  zonegroups[zonegroup.get_id()] = zonegroup;
+
+  if (!zonegroup.api_name.empty()) {
+    zonegroups_by_api[zonegroup.api_name] = zonegroup;
+  }
+
+  if (zonegroup.is_master_zonegroup()) {
+    master_zonegroup = zonegroup.get_id();
+  } else if (master_zonegroup == zonegroup.get_id()) {
+    master_zonegroup = "";
+  }
+
+  for (auto& i : zonegroup.zones) {
+    auto& zone = i.second;
+    if (short_zone_ids.find(zone.id) != short_zone_ids.end()) {
+      continue;
+    }
+    // calculate the zone's short id
+    uint32_t short_id = gen_short_zone_id(zone.id);
+
+    // search for an existing zone with the same short id
+    for (auto& s : short_zone_ids) {
+      if (s.second == short_id) {
+        ldout(cct, 0) << "New zone '" << zone.name << "' (" << zone.id
+            << ") generates the same short_zone_id " << short_id
+            << " as existing zone id " << s.first << dendl;
+        return -EEXIST;
+      }
+    }
+
+    short_zone_ids[zone.id] = short_id;
+  }
+
+  return 0;
+}
+
+uint32_t RGWPeriodMap::get_zone_short_id(const string& zone_id) const
+{
+  auto i = short_zone_ids.find(zone_id);
+  if (i == short_zone_ids.end()) {
+    return 0;
+  }
+  return i->second;
+}
+
+int RGWZoneGroupMap::read(CephContext *cct, RGWSI_SysObj *sysobj_svc)
+{
+
+  RGWPeriod period;
+  int ret = period.init(cct, sysobj_svc);
+  if (ret < 0) {
+    cerr << "failed to read current period info: " << cpp_strerror(ret);
+    return ret;
+  }
+	
+  bucket_quota = period.get_config().bucket_quota;
+  user_quota = period.get_config().user_quota;
+  zonegroups = period.get_map().zonegroups;
+  zonegroups_by_api = period.get_map().zonegroups_by_api;
+  master_zonegroup = period.get_map().master_zonegroup;
+
+  return 0;
+}
+
+void RGWRegionMap::encode(bufferlist& bl) const {
+  ENCODE_START( 3, 1, bl);
+  encode(regions, bl);
+  encode(master_region, bl);
+  encode(bucket_quota, bl);
+  encode(user_quota, bl);
+  ENCODE_FINISH(bl);
+}
+
+void RGWRegionMap::decode(bufferlist::const_iterator& bl) {
+  DECODE_START(3, bl);
+  decode(regions, bl);
+  decode(master_region, bl);
+  if (struct_v >= 2)
+    decode(bucket_quota, bl);
+  if (struct_v >= 3)
+    decode(user_quota, bl);
+  DECODE_FINISH(bl);
+}
+
+void RGWZoneGroupMap::encode(bufferlist& bl) const {
+  ENCODE_START( 3, 1, bl);
+  encode(zonegroups, bl);
+  encode(master_zonegroup, bl);
+  encode(bucket_quota, bl);
+  encode(user_quota, bl);
+  ENCODE_FINISH(bl);
+}
+
+void RGWZoneGroupMap::decode(bufferlist::const_iterator& bl) {
+  DECODE_START(3, bl);
+  decode(zonegroups, bl);
+  decode(master_zonegroup, bl);
+  if (struct_v >= 2)
+    decode(bucket_quota, bl);
+  if (struct_v >= 3)
+    decode(user_quota, bl);
+  DECODE_FINISH(bl);
+
+  zonegroups_by_api.clear();
+  for (map<string, RGWZoneGroup>::iterator iter = zonegroups.begin();
+       iter != zonegroups.end(); ++iter) {
+    RGWZoneGroup& zonegroup = iter->second;
+    zonegroups_by_api[zonegroup.api_name] = zonegroup;
+    if (zonegroup.is_master_zonegroup()) {
+      master_zonegroup = zonegroup.get_name();
+    }
+  }
+}
+
+