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// -*- 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) 2010 Greg Farnum <gregf@hq.newdream.net>
*
* 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 <memory>
#include "common/errno.h"
#include "osdc/Journaler.h"
#include "mds/JournalPointer.h"
#include "mds/mdstypes.h"
#include "mds/MDCache.h"
#include "mon/MonClient.h"
#include "mds/events/EResetJournal.h"
#include "Resetter.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_mds
using namespace std;
int Resetter::init(mds_role_t role_, const std::string &type, bool hard)
{
role = role_;
int r = MDSUtility::init();
if (r < 0) {
return r;
}
auto fs = fsmap->get_filesystem(role.fscid);
ceph_assert(nullptr != fs);
is_mdlog = false;
if (type == "mdlog") {
JournalPointer jp(role.rank, fs->mds_map.get_metadata_pool());
int rt = 0;
if (hard) {
jp.front = role.rank + MDS_INO_LOG_OFFSET;
jp.back = 0;
rt = jp.save(objecter);
if (rt != 0) {
derr << "Error writing journal pointer: " << cpp_strerror(rt) << dendl;
return rt;
}
ino = jp.front; // only need to reset ino for mdlog
} else {
rt = jp.load(objecter);
if (rt != 0) {
std::cerr << "Error loading journal: " << cpp_strerror(rt) <<
", pass --force to forcibly reset this journal" << std::endl;
return rt;
} else {
ino = jp.front;
}
}
is_mdlog = true;
} else if (type == "purge_queue") {
ino = MDS_INO_PURGE_QUEUE + role.rank;
} else {
ceph_abort(); // should not get here
}
return 0;
}
int Resetter::reset()
{
ceph::mutex mylock = ceph::make_mutex("Resetter::reset::lock");
ceph::condition_variable cond;
bool done;
int r;
auto fs = fsmap->get_filesystem(role.fscid);
ceph_assert(fs != nullptr);
Journaler journaler("resetter", ino,
fs->mds_map.get_metadata_pool(),
CEPH_FS_ONDISK_MAGIC,
objecter, 0, 0, &finisher);
{
std::lock_guard locker{lock};
journaler.recover(new C_SafeCond(mylock, cond, &done, &r));
}
{
std::unique_lock locker{mylock};
cond.wait(locker, [&done] { return done; });
}
if (r != 0) {
if (r == -ENOENT) {
cerr << "journal does not exist on-disk. Did you set a bad rank?"
<< std::endl;
std::cerr << "Error loading journal: " << cpp_strerror(r) <<
", pass --force to forcibly reset this journal" << std::endl;
return r;
} else {
cerr << "got error " << r << "from Journaler, failing" << std::endl;
return r;
}
}
lock.lock();
uint64_t old_start = journaler.get_read_pos();
uint64_t old_end = journaler.get_write_pos();
uint64_t old_len = old_end - old_start;
cout << "old journal was " << old_start << "~" << old_len << std::endl;
uint64_t new_start = round_up_to(old_end+1, journaler.get_layout_period());
cout << "new journal start will be " << new_start
<< " (" << (new_start - old_end) << " bytes past old end)" << std::endl;
journaler.set_read_pos(new_start);
journaler.set_write_pos(new_start);
journaler.set_expire_pos(new_start);
journaler.set_trimmed_pos(new_start);
journaler.set_writeable();
cout << "writing journal head" << std::endl;
journaler.write_head(new C_SafeCond(mylock, cond, &done, &r));
lock.unlock();
{
std::unique_lock locker{mylock};
cond.wait(locker, [&done] { return done; });
}
std::lock_guard l{lock};
if (r != 0) {
return r;
}
if (is_mdlog) {
r = _write_reset_event(&journaler); // reset envent is specific for mdlog journal
if (r != 0) {
return r;
}
}
cout << "done" << std::endl;
return 0;
}
int Resetter::reset_hard()
{
auto fs = fsmap->get_filesystem(role.fscid);
Journaler journaler("resetter", ino,
fs->mds_map.get_metadata_pool(),
CEPH_FS_ONDISK_MAGIC,
objecter, 0, 0, &finisher);
journaler.set_writeable();
file_layout_t default_log_layout = MDCache::gen_default_log_layout(
fsmap->get_filesystem(role.fscid)->mds_map);
journaler.create(&default_log_layout, g_conf()->mds_journal_format);
C_SaferCond cond;
{
std::lock_guard l{lock};
journaler.write_head(&cond);
}
int r = cond.wait();
if (r != 0) {
derr << "Error writing journal header: " << cpp_strerror(r) << dendl;
return r;
}
if (is_mdlog) // reset event is specific for mdlog journal
{
std::lock_guard l{lock};
r = _write_reset_event(&journaler);
if (r != 0) {
derr << "Error writing EResetJournal: " << cpp_strerror(r) << dendl;
return r;
}
}
if (is_mdlog) {
dout(4) << "Successfully wrote new journal pointer and header for rank "
<< role << dendl;
} else {
dout(4) << "Successfully wrote header for rank " << role << dendl;
}
return 0;
}
int Resetter::_write_reset_event(Journaler *journaler)
{
ceph_assert(journaler != NULL);
auto le = std::make_unique<EResetJournal>();
bufferlist bl;
le->encode_with_header(bl, CEPH_FEATURES_SUPPORTED_DEFAULT);
cout << "writing EResetJournal entry" << std::endl;
journaler->append_entry(bl);
int ret;
{
C_SaferCond cond;
journaler->flush(&cond);
ret = cond.wait();
if (ret < 0)
return ret;
}
{
// wait until all journal prezero ops are done
C_SaferCond cond;
journaler->wait_for_prezero(&cond);
cond.wait();
}
return ret;
}
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