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// vim: ts=8 sw=2 smarttab ft=cpp
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2022 Red Hat, 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.
*
*/
#include "common/dout.h"
#include "common/errno.h"
#include "rgw_zone.h"
#include "driver/rados/config/store.h"
#include "impl.h"
namespace rgw::rados {
// period oids
constexpr std::string_view period_info_oid_prefix = "periods.";
constexpr std::string_view period_latest_epoch_info_oid = ".latest_epoch";
constexpr std::string_view period_staging_suffix = ":staging";
static std::string period_oid(std::string_view period_id, uint32_t epoch)
{
// omit the epoch for the staging period
if (period_id.ends_with(period_staging_suffix)) {
return string_cat_reserve(period_info_oid_prefix, period_id);
}
return fmt::format("{}{}.{}", period_info_oid_prefix, period_id, epoch);
}
static std::string latest_epoch_oid(const ceph::common::ConfigProxy& conf,
std::string_view period_id)
{
return string_cat_reserve(
period_info_oid_prefix, period_id,
name_or_default(conf->rgw_period_latest_epoch_info_oid,
period_latest_epoch_info_oid));
}
static int read_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, std::string_view period_id,
uint32_t& epoch, RGWObjVersionTracker* objv)
{
const auto& pool = impl->period_pool;
const auto latest_oid = latest_epoch_oid(dpp->get_cct()->_conf, period_id);
RGWPeriodLatestEpochInfo latest;
int r = impl->read(dpp, y, pool, latest_oid, latest, objv);
if (r >= 0) {
epoch = latest.epoch;
}
return r;
}
static int write_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, bool exclusive,
std::string_view period_id, uint32_t epoch,
RGWObjVersionTracker* objv)
{
const auto& pool = impl->period_pool;
const auto latest_oid = latest_epoch_oid(dpp->get_cct()->_conf, period_id);
const auto create = exclusive ? Create::MustNotExist : Create::MayExist;
RGWPeriodLatestEpochInfo latest{epoch};
return impl->write(dpp, y, pool, latest_oid, create, latest, objv);
}
static int delete_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, std::string_view period_id,
RGWObjVersionTracker* objv)
{
const auto& pool = impl->period_pool;
const auto latest_oid = latest_epoch_oid(dpp->get_cct()->_conf, period_id);
return impl->remove(dpp, y, pool, latest_oid, objv);
}
static int update_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, std::string_view period_id,
uint32_t epoch)
{
static constexpr int MAX_RETRIES = 20;
for (int i = 0; i < MAX_RETRIES; i++) {
uint32_t existing_epoch = 0;
RGWObjVersionTracker objv;
bool exclusive = false;
// read existing epoch
int r = read_latest_epoch(dpp, y, impl, period_id, existing_epoch, &objv);
if (r == -ENOENT) {
// use an exclusive create to set the epoch atomically
exclusive = true;
objv.generate_new_write_ver(dpp->get_cct());
ldpp_dout(dpp, 20) << "creating initial latest_epoch=" << epoch
<< " for period=" << period_id << dendl;
} else if (r < 0) {
ldpp_dout(dpp, 0) << "ERROR: failed to read latest_epoch" << dendl;
return r;
} else if (epoch <= existing_epoch) {
r = -EEXIST; // fail with EEXIST if epoch is not newer
ldpp_dout(dpp, 10) << "found existing latest_epoch " << existing_epoch
<< " >= given epoch " << epoch << ", returning r=" << r << dendl;
return r;
} else {
ldpp_dout(dpp, 20) << "updating latest_epoch from " << existing_epoch
<< " -> " << epoch << " on period=" << period_id << dendl;
}
r = write_latest_epoch(dpp, y, impl, exclusive, period_id, epoch, &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) {
ldpp_dout(dpp, 0) << "ERROR: failed to write latest_epoch" << dendl;
return r;
}
return 0; // return success
}
return -ECANCELED; // fail after max retries
}
int RadosConfigStore::create_period(const DoutPrefixProvider* dpp,
optional_yield y, bool exclusive,
const RGWPeriod& info)
{
if (info.get_id().empty()) {
ldpp_dout(dpp, 0) << "period cannot have an empty id" << dendl;
return -EINVAL;
}
if (info.get_epoch() == 0) {
ldpp_dout(dpp, 0) << "period cannot have an empty epoch" << dendl;
return -EINVAL;
}
const auto& pool = impl->period_pool;
const auto info_oid = period_oid(info.get_id(), info.get_epoch());
const auto create = exclusive ? Create::MustNotExist : Create::MayExist;
RGWObjVersionTracker objv;
objv.generate_new_write_ver(dpp->get_cct());
int r = impl->write(dpp, y, pool, info_oid, create, info, &objv);
if (r < 0) {
return r;
}
(void) update_latest_epoch(dpp, y, impl.get(), info.get_id(), info.get_epoch());
return 0;
}
int RadosConfigStore::read_period(const DoutPrefixProvider* dpp,
optional_yield y,
std::string_view period_id,
std::optional<uint32_t> epoch,
RGWPeriod& info)
{
int r = 0;
if (!epoch) {
epoch = 0;
r = read_latest_epoch(dpp, y, impl.get(), period_id, *epoch, nullptr);
if (r < 0) {
return r;
}
}
const auto& pool = impl->period_pool;
const auto info_oid = period_oid(period_id, *epoch);
return impl->read(dpp, y, pool, info_oid, info, nullptr);
}
int RadosConfigStore::delete_period(const DoutPrefixProvider* dpp,
optional_yield y,
std::string_view period_id)
{
const auto& pool = impl->period_pool;
// read the latest_epoch
uint32_t latest_epoch = 0;
RGWObjVersionTracker latest_objv;
int r = read_latest_epoch(dpp, y, impl.get(), period_id,
latest_epoch, &latest_objv);
if (r < 0 && r != -ENOENT) { // just delete epoch=0 on ENOENT
ldpp_dout(dpp, 0) << "failed to read latest epoch for period "
<< period_id << ": " << cpp_strerror(r) << dendl;
return r;
}
for (uint32_t epoch = 0; epoch <= latest_epoch; epoch++) {
const auto info_oid = period_oid(period_id, epoch);
r = impl->remove(dpp, y, pool, info_oid, nullptr);
if (r < 0 && r != -ENOENT) { // ignore ENOENT
ldpp_dout(dpp, 0) << "failed to delete period " << info_oid
<< ": " << cpp_strerror(r) << dendl;
return r;
}
}
return delete_latest_epoch(dpp, y, impl.get(), period_id, &latest_objv);
}
int RadosConfigStore::list_period_ids(const DoutPrefixProvider* dpp,
optional_yield y,
const std::string& marker,
std::span<std::string> entries,
sal::ListResult<std::string>& result)
{
const auto& pool = impl->period_pool;
constexpr auto prefix = [] (std::string oid) -> std::string {
if (!oid.starts_with(period_info_oid_prefix)) {
return {};
}
if (!oid.ends_with(period_latest_epoch_info_oid)) {
return {};
}
// trim the prefix and suffix
const std::size_t count = oid.size() -
period_info_oid_prefix.size() -
period_latest_epoch_info_oid.size();
return oid.substr(period_info_oid_prefix.size(), count);
};
return impl->list(dpp, y, pool, marker, prefix, entries, result);
}
} // namespace rgw::rados
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