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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
#include "svc_mdlog.h"
#include "svc_rados.h"
#include "svc_zone.h"
#include "svc_sys_obj.h"
#include "rgw_tools.h"
#include "rgw_mdlog.h"
#include "rgw_coroutine.h"
#include "rgw_cr_rados.h"
#include "rgw_zone.h"
#include "common/errno.h"
#include <boost/asio/yield.hpp>
#define dout_subsys ceph_subsys_rgw
using namespace std;
using Svc = RGWSI_MDLog::Svc;
using Cursor = RGWPeriodHistory::Cursor;
RGWSI_MDLog::RGWSI_MDLog(CephContext *cct, bool _run_sync) : RGWServiceInstance(cct), run_sync(_run_sync) {
}
RGWSI_MDLog::~RGWSI_MDLog() {
}
int RGWSI_MDLog::init(RGWSI_RADOS *_rados_svc, RGWSI_Zone *_zone_svc, RGWSI_SysObj *_sysobj_svc, RGWSI_Cls *_cls_svc)
{
svc.zone = _zone_svc;
svc.sysobj = _sysobj_svc;
svc.mdlog = this;
svc.rados = _rados_svc;
svc.cls = _cls_svc;
return 0;
}
int RGWSI_MDLog::do_start(optional_yield y, const DoutPrefixProvider *dpp)
{
auto& current_period = svc.zone->get_current_period();
current_log = get_log(current_period.get_id());
period_puller.reset(new RGWPeriodPuller(svc.zone, svc.sysobj));
period_history.reset(new RGWPeriodHistory(cct, period_puller.get(),
current_period));
if (run_sync &&
svc.zone->need_to_sync()) {
// initialize the log period history
svc.mdlog->init_oldest_log_period(y, dpp);
}
return 0;
}
int RGWSI_MDLog::read_history(RGWMetadataLogHistory *state,
RGWObjVersionTracker *objv_tracker,
optional_yield y,
const DoutPrefixProvider *dpp) const
{
auto& pool = svc.zone->get_zone_params().log_pool;
const auto& oid = RGWMetadataLogHistory::oid;
bufferlist bl;
int ret = rgw_get_system_obj(svc.sysobj, pool, oid, bl, objv_tracker, nullptr, y, dpp);
if (ret < 0) {
return ret;
}
if (bl.length() == 0) {
/* bad history object, remove it */
rgw_raw_obj obj(pool, oid);
auto sysobj = svc.sysobj->get_obj(obj);
ret = sysobj.wop().remove(dpp, y);
if (ret < 0) {
ldpp_dout(dpp, 0) << "ERROR: meta history is empty, but cannot remove it (" << cpp_strerror(-ret) << ")" << dendl;
return ret;
}
return -ENOENT;
}
try {
auto p = bl.cbegin();
state->decode(p);
} catch (buffer::error& e) {
ldpp_dout(dpp, 1) << "failed to decode the mdlog history: "
<< e.what() << dendl;
return -EIO;
}
return 0;
}
int RGWSI_MDLog::write_history(const DoutPrefixProvider *dpp,
const RGWMetadataLogHistory& state,
RGWObjVersionTracker *objv_tracker,
optional_yield y, bool exclusive)
{
bufferlist bl;
state.encode(bl);
auto& pool = svc.zone->get_zone_params().log_pool;
const auto& oid = RGWMetadataLogHistory::oid;
return rgw_put_system_obj(dpp, svc.sysobj, pool, oid, bl,
exclusive, objv_tracker, real_time{}, y);
}
namespace mdlog {
using Cursor = RGWPeriodHistory::Cursor;
namespace {
template <class T>
class SysObjReadCR : public RGWSimpleCoroutine {
const DoutPrefixProvider *dpp;
RGWAsyncRadosProcessor *async_rados;
RGWSI_SysObj *svc;
rgw_raw_obj obj;
T *result;
/// on ENOENT, call handle_data() with an empty object instead of failing
const bool empty_on_enoent;
RGWObjVersionTracker *objv_tracker;
RGWAsyncGetSystemObj *req{nullptr};
public:
SysObjReadCR(const DoutPrefixProvider *_dpp,
RGWAsyncRadosProcessor *_async_rados, RGWSI_SysObj *_svc,
const rgw_raw_obj& _obj,
T *_result, bool empty_on_enoent = true,
RGWObjVersionTracker *objv_tracker = nullptr)
: RGWSimpleCoroutine(_svc->ctx()), dpp(_dpp), async_rados(_async_rados), svc(_svc),
obj(_obj), result(_result),
empty_on_enoent(empty_on_enoent), objv_tracker(objv_tracker) {}
~SysObjReadCR() override {
try {
request_cleanup();
} catch (const boost::container::length_error_t& e) {
ldpp_dout(dpp, 0) << "ERROR: " << __func__ <<
": reference counted object mismatched, \"" << e.what() <<
"\"" << dendl;
}
}
void request_cleanup() override {
if (req) {
req->finish();
req = NULL;
}
}
int send_request(const DoutPrefixProvider *dpp) {
req = new RGWAsyncGetSystemObj(dpp, this, stack->create_completion_notifier(), svc,
objv_tracker, obj, false, false);
async_rados->queue(req);
return 0;
}
int request_complete() {
int ret = req->get_ret_status();
retcode = ret;
if (ret == -ENOENT && empty_on_enoent) {
*result = T();
} else {
if (ret < 0) {
return ret;
}
if (objv_tracker) { // copy the updated version
*objv_tracker = req->objv_tracker;
}
try {
auto iter = req->bl.cbegin();
if (iter.end()) {
// allow successful reads with empty buffers. ReadSyncStatus
// coroutines depend on this to be able to read without
// locking, because the cls lock from InitSyncStatus will
// create an empty object if it didn't exist
*result = T();
} else {
decode(*result, iter);
}
} catch (buffer::error& err) {
return -EIO;
}
}
return handle_data(*result);
}
virtual int handle_data(T& data) {
return 0;
}
};
template <class T>
class SysObjWriteCR : public RGWSimpleCoroutine {
const DoutPrefixProvider *dpp;
RGWAsyncRadosProcessor *async_rados;
RGWSI_SysObj *svc;
bufferlist bl;
rgw_raw_obj obj;
RGWObjVersionTracker *objv_tracker;
bool exclusive;
RGWAsyncPutSystemObj *req{nullptr};
public:
SysObjWriteCR(const DoutPrefixProvider *_dpp,
RGWAsyncRadosProcessor *_async_rados, RGWSI_SysObj *_svc,
const rgw_raw_obj& _obj, const T& _data,
RGWObjVersionTracker *objv_tracker = nullptr,
bool exclusive = false)
: RGWSimpleCoroutine(_svc->ctx()), dpp(_dpp), async_rados(_async_rados),
svc(_svc), obj(_obj), objv_tracker(objv_tracker), exclusive(exclusive) {
encode(_data, bl);
}
~SysObjWriteCR() override {
try {
request_cleanup();
} catch (const boost::container::length_error_t& e) {
ldpp_dout(dpp, 0) << "ERROR: " << __func__ <<
": reference counted object mismatched, \"" << e.what() <<
"\"" << dendl;
}
}
void request_cleanup() override {
if (req) {
req->finish();
req = NULL;
}
}
int send_request(const DoutPrefixProvider *dpp) override {
req = new RGWAsyncPutSystemObj(dpp, this, stack->create_completion_notifier(),
svc, objv_tracker, obj, exclusive, std::move(bl));
async_rados->queue(req);
return 0;
}
int request_complete() override {
if (objv_tracker) { // copy the updated version
*objv_tracker = req->objv_tracker;
}
return req->get_ret_status();
}
};
}
/// read the mdlog history and use it to initialize the given cursor
class ReadHistoryCR : public RGWCoroutine {
const DoutPrefixProvider *dpp;
Svc svc;
Cursor *cursor;
RGWObjVersionTracker *objv_tracker;
RGWMetadataLogHistory state;
RGWAsyncRadosProcessor *async_processor;
public:
ReadHistoryCR(const DoutPrefixProvider *dpp,
const Svc& svc,
Cursor *cursor,
RGWObjVersionTracker *objv_tracker)
: RGWCoroutine(svc.zone->ctx()), dpp(dpp), svc(svc),
cursor(cursor),
objv_tracker(objv_tracker),
async_processor(svc.rados->get_async_processor())
{}
int operate(const DoutPrefixProvider *dpp) {
reenter(this) {
yield {
rgw_raw_obj obj{svc.zone->get_zone_params().log_pool,
RGWMetadataLogHistory::oid};
constexpr bool empty_on_enoent = false;
using ReadCR = SysObjReadCR<RGWMetadataLogHistory>;
call(new ReadCR(dpp, async_processor, svc.sysobj, obj,
&state, empty_on_enoent, objv_tracker));
}
if (retcode < 0) {
ldpp_dout(dpp, 1) << "failed to read mdlog history: "
<< cpp_strerror(retcode) << dendl;
return set_cr_error(retcode);
}
*cursor = svc.mdlog->period_history->lookup(state.oldest_realm_epoch);
if (!*cursor) {
return set_cr_error(cursor->get_error());
}
ldpp_dout(dpp, 10) << "read mdlog history with oldest period id="
<< state.oldest_period_id << " realm_epoch="
<< state.oldest_realm_epoch << dendl;
return set_cr_done();
}
return 0;
}
};
/// write the given cursor to the mdlog history
class WriteHistoryCR : public RGWCoroutine {
const DoutPrefixProvider *dpp;
Svc svc;
Cursor cursor;
RGWObjVersionTracker *objv;
RGWMetadataLogHistory state;
RGWAsyncRadosProcessor *async_processor;
public:
WriteHistoryCR(const DoutPrefixProvider *dpp,
Svc& svc,
const Cursor& cursor,
RGWObjVersionTracker *objv)
: RGWCoroutine(svc.zone->ctx()), dpp(dpp), svc(svc),
cursor(cursor), objv(objv),
async_processor(svc.rados->get_async_processor())
{}
int operate(const DoutPrefixProvider *dpp) {
reenter(this) {
state.oldest_period_id = cursor.get_period().get_id();
state.oldest_realm_epoch = cursor.get_epoch();
yield {
rgw_raw_obj obj{svc.zone->get_zone_params().log_pool,
RGWMetadataLogHistory::oid};
using WriteCR = SysObjWriteCR<RGWMetadataLogHistory>;
call(new WriteCR(dpp, async_processor, svc.sysobj, obj, state, objv));
}
if (retcode < 0) {
ldpp_dout(dpp, 1) << "failed to write mdlog history: "
<< cpp_strerror(retcode) << dendl;
return set_cr_error(retcode);
}
ldpp_dout(dpp, 10) << "wrote mdlog history with oldest period id="
<< state.oldest_period_id << " realm_epoch="
<< state.oldest_realm_epoch << dendl;
return set_cr_done();
}
return 0;
}
};
/// update the mdlog history to reflect trimmed logs
class TrimHistoryCR : public RGWCoroutine {
const DoutPrefixProvider *dpp;
Svc svc;
const Cursor cursor; //< cursor to trimmed period
RGWObjVersionTracker *objv; //< to prevent racing updates
Cursor next; //< target cursor for oldest log period
Cursor existing; //< existing cursor read from disk
public:
TrimHistoryCR(const DoutPrefixProvider *dpp, const Svc& svc, Cursor cursor, RGWObjVersionTracker *objv)
: RGWCoroutine(svc.zone->ctx()), dpp(dpp), svc(svc),
cursor(cursor), objv(objv), next(cursor) {
next.next(); // advance past cursor
}
int operate(const DoutPrefixProvider *dpp) {
reenter(this) {
// read an existing history, and write the new history if it's newer
yield call(new ReadHistoryCR(dpp, svc, &existing, objv));
if (retcode < 0) {
return set_cr_error(retcode);
}
// reject older trims with ECANCELED
if (cursor.get_epoch() < existing.get_epoch()) {
ldpp_dout(dpp, 4) << "found oldest log epoch=" << existing.get_epoch()
<< ", rejecting trim at epoch=" << cursor.get_epoch() << dendl;
return set_cr_error(-ECANCELED);
}
// overwrite with updated history
yield call(new WriteHistoryCR(dpp, svc, next, objv));
if (retcode < 0) {
return set_cr_error(retcode);
}
return set_cr_done();
}
return 0;
}
};
} // mdlog namespace
// traverse all the way back to the beginning of the period history, and
// return a cursor to the first period in a fully attached history
Cursor RGWSI_MDLog::find_oldest_period(const DoutPrefixProvider *dpp, optional_yield y)
{
auto cursor = period_history->get_current();
while (cursor) {
// advance to the period's predecessor
if (!cursor.has_prev()) {
auto& predecessor = cursor.get_period().get_predecessor();
if (predecessor.empty()) {
// this is the first period, so our logs must start here
ldpp_dout(dpp, 10) << "find_oldest_period returning first "
"period " << cursor.get_period().get_id() << dendl;
return cursor;
}
// pull the predecessor and add it to our history
RGWPeriod period;
int r = period_puller->pull(dpp, predecessor, period, y);
if (r < 0) {
return cursor;
}
auto prev = period_history->insert(std::move(period));
if (!prev) {
return prev;
}
ldpp_dout(dpp, 20) << "find_oldest_period advancing to "
"predecessor period " << predecessor << dendl;
ceph_assert(cursor.has_prev());
}
cursor.prev();
}
ldpp_dout(dpp, 10) << "find_oldest_period returning empty cursor" << dendl;
return cursor;
}
Cursor RGWSI_MDLog::init_oldest_log_period(optional_yield y, const DoutPrefixProvider *dpp)
{
// read the mdlog history
RGWMetadataLogHistory state;
RGWObjVersionTracker objv;
int ret = read_history(&state, &objv, y, dpp);
if (ret == -ENOENT) {
// initialize the mdlog history and write it
ldpp_dout(dpp, 10) << "initializing mdlog history" << dendl;
auto cursor = find_oldest_period(dpp, y);
if (!cursor) {
return cursor;
}
// write the initial history
state.oldest_realm_epoch = cursor.get_epoch();
state.oldest_period_id = cursor.get_period().get_id();
constexpr bool exclusive = true; // don't overwrite
int ret = write_history(dpp, state, &objv, y, exclusive);
if (ret < 0 && ret != -EEXIST) {
ldpp_dout(dpp, 1) << "failed to write mdlog history: "
<< cpp_strerror(ret) << dendl;
return Cursor{ret};
}
return cursor;
} else if (ret < 0) {
ldpp_dout(dpp, 1) << "failed to read mdlog history: "
<< cpp_strerror(ret) << dendl;
return Cursor{ret};
}
// if it's already in the history, return it
auto cursor = period_history->lookup(state.oldest_realm_epoch);
if (cursor) {
return cursor;
} else {
cursor = find_oldest_period(dpp, y);
state.oldest_realm_epoch = cursor.get_epoch();
state.oldest_period_id = cursor.get_period().get_id();
ldpp_dout(dpp, 10) << "rewriting mdlog history" << dendl;
ret = write_history(dpp, state, &objv, y);
if (ret < 0 && ret != -ECANCELED) {
ldpp_dout(dpp, 1) << "failed to write mdlog history: "
<< cpp_strerror(ret) << dendl;
return Cursor{ret};
}
return cursor;
}
// pull the oldest period by id
RGWPeriod period;
ret = period_puller->pull(dpp, state.oldest_period_id, period, y);
if (ret < 0) {
ldpp_dout(dpp, 1) << "failed to read period id=" << state.oldest_period_id
<< " for mdlog history: " << cpp_strerror(ret) << dendl;
return Cursor{ret};
}
// verify its realm_epoch
if (period.get_realm_epoch() != state.oldest_realm_epoch) {
ldpp_dout(dpp, 1) << "inconsistent mdlog history: read period id="
<< period.get_id() << " with realm_epoch=" << period.get_realm_epoch()
<< ", expected realm_epoch=" << state.oldest_realm_epoch << dendl;
return Cursor{-EINVAL};
}
// attach the period to our history
return period_history->attach(dpp, std::move(period), y);
}
Cursor RGWSI_MDLog::read_oldest_log_period(optional_yield y, const DoutPrefixProvider *dpp) const
{
RGWMetadataLogHistory state;
int ret = read_history(&state, nullptr, y, dpp);
if (ret < 0) {
ldpp_dout(dpp, 1) << "failed to read mdlog history: "
<< cpp_strerror(ret) << dendl;
return Cursor{ret};
}
ldpp_dout(dpp, 10) << "read mdlog history with oldest period id="
<< state.oldest_period_id << " realm_epoch="
<< state.oldest_realm_epoch << dendl;
return period_history->lookup(state.oldest_realm_epoch);
}
RGWCoroutine* RGWSI_MDLog::read_oldest_log_period_cr(const DoutPrefixProvider *dpp,
Cursor *period, RGWObjVersionTracker *objv) const
{
return new mdlog::ReadHistoryCR(dpp, svc, period, objv);
}
RGWCoroutine* RGWSI_MDLog::trim_log_period_cr(const DoutPrefixProvider *dpp,
Cursor period, RGWObjVersionTracker *objv) const
{
return new mdlog::TrimHistoryCR(dpp, svc, period, objv);
}
RGWMetadataLog* RGWSI_MDLog::get_log(const std::string& period)
{
// construct the period's log in place if it doesn't exist
auto insert = md_logs.emplace(std::piecewise_construct,
std::forward_as_tuple(period),
std::forward_as_tuple(cct, svc.zone, svc.cls, period));
return &insert.first->second;
}
int RGWSI_MDLog::add_entry(const DoutPrefixProvider *dpp, const string& hash_key, const string& section, const string& key, bufferlist& bl)
{
ceph_assert(current_log); // must have called init()
return current_log->add_entry(dpp, hash_key, section, key, bl);
}
int RGWSI_MDLog::get_shard_id(const string& hash_key, int *shard_id)
{
ceph_assert(current_log); // must have called init()
return current_log->get_shard_id(hash_key, shard_id);
}
int RGWSI_MDLog::pull_period(const DoutPrefixProvider *dpp, const std::string& period_id, RGWPeriod& period,
optional_yield y)
{
return period_puller->pull(dpp, period_id, period, y);
}
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