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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "journal/JournalTrimmer.h"
#include "journal/Utils.h"
#include "common/Cond.h"
#include "common/errno.h"
#include <limits>
#define dout_subsys ceph_subsys_journaler
#undef dout_prefix
#define dout_prefix *_dout << "JournalTrimmer: " << this << " "
namespace journal {
struct JournalTrimmer::C_RemoveSet : public Context {
JournalTrimmer *journal_trimmer;
uint64_t object_set;
ceph::mutex lock = ceph::make_mutex("JournalTrimmer::m_lock");
uint32_t refs;
int return_value;
C_RemoveSet(JournalTrimmer *_journal_trimmer, uint64_t _object_set,
uint8_t _splay_width);
void complete(int r) override;
void finish(int r) override {
journal_trimmer->handle_set_removed(r, object_set);
journal_trimmer->m_async_op_tracker.finish_op();
}
};
JournalTrimmer::JournalTrimmer(librados::IoCtx &ioctx,
const std::string &object_oid_prefix,
const ceph::ref_t<JournalMetadata>& journal_metadata)
: m_cct(NULL), m_object_oid_prefix(object_oid_prefix),
m_journal_metadata(journal_metadata), m_metadata_listener(this),
m_remove_set_pending(false),
m_remove_set(0), m_remove_set_ctx(NULL) {
m_ioctx.dup(ioctx);
m_cct = reinterpret_cast<CephContext *>(m_ioctx.cct());
m_journal_metadata->add_listener(&m_metadata_listener);
}
JournalTrimmer::~JournalTrimmer() {
ceph_assert(m_shutdown);
}
void JournalTrimmer::shut_down(Context *on_finish) {
ldout(m_cct, 20) << __func__ << dendl;
{
std::lock_guard locker{m_lock};
ceph_assert(!m_shutdown);
m_shutdown = true;
}
m_journal_metadata->remove_listener(&m_metadata_listener);
// chain the shut down sequence (reverse order)
on_finish = new LambdaContext([this, on_finish](int r) {
m_async_op_tracker.wait_for_ops(on_finish);
});
m_journal_metadata->flush_commit_position(on_finish);
}
void JournalTrimmer::remove_objects(bool force, Context *on_finish) {
ldout(m_cct, 20) << __func__ << dendl;
on_finish = new LambdaContext([this, force, on_finish](int r) {
std::lock_guard locker{m_lock};
if (m_remove_set_pending) {
on_finish->complete(-EBUSY);
}
if (!force) {
JournalMetadata::RegisteredClients registered_clients;
m_journal_metadata->get_registered_clients(®istered_clients);
if (registered_clients.size() == 0) {
on_finish->complete(-EINVAL);
return;
} else if (registered_clients.size() > 1) {
on_finish->complete(-EBUSY);
return;
}
}
m_remove_set = std::numeric_limits<uint64_t>::max();
m_remove_set_pending = true;
m_remove_set_ctx = on_finish;
remove_set(m_journal_metadata->get_minimum_set());
});
m_async_op_tracker.wait_for_ops(on_finish);
}
void JournalTrimmer::committed(uint64_t commit_tid) {
ldout(m_cct, 20) << __func__ << ": commit_tid=" << commit_tid << dendl;
m_journal_metadata->committed(commit_tid,
m_create_commit_position_safe_context);
}
void JournalTrimmer::trim_objects(uint64_t minimum_set) {
ceph_assert(ceph_mutex_is_locked(m_lock));
ldout(m_cct, 20) << __func__ << ": min_set=" << minimum_set << dendl;
if (minimum_set <= m_journal_metadata->get_minimum_set()) {
return;
}
if (m_remove_set_pending) {
m_remove_set = std::max(m_remove_set, minimum_set);
return;
}
m_remove_set = minimum_set;
m_remove_set_pending = true;
remove_set(m_journal_metadata->get_minimum_set());
}
void JournalTrimmer::remove_set(uint64_t object_set) {
ceph_assert(ceph_mutex_is_locked(m_lock));
m_async_op_tracker.start_op();
uint8_t splay_width = m_journal_metadata->get_splay_width();
C_RemoveSet *ctx = new C_RemoveSet(this, object_set, splay_width);
ldout(m_cct, 20) << __func__ << ": removing object set " << object_set
<< dendl;
for (uint64_t object_number = object_set * splay_width;
object_number < (object_set + 1) * splay_width;
++object_number) {
std::string oid = utils::get_object_name(m_object_oid_prefix,
object_number);
ldout(m_cct, 20) << "removing journal object " << oid << dendl;
auto comp =
librados::Rados::aio_create_completion(ctx, utils::rados_ctx_callback);
int r = m_ioctx.aio_remove(oid, comp,
CEPH_OSD_FLAG_FULL_FORCE | CEPH_OSD_FLAG_FULL_TRY);
ceph_assert(r == 0);
comp->release();
}
}
void JournalTrimmer::handle_metadata_updated() {
ldout(m_cct, 20) << __func__ << dendl;
std::lock_guard locker{m_lock};
JournalMetadata::RegisteredClients registered_clients;
m_journal_metadata->get_registered_clients(®istered_clients);
uint8_t splay_width = m_journal_metadata->get_splay_width();
uint64_t minimum_set = m_journal_metadata->get_minimum_set();
uint64_t active_set = m_journal_metadata->get_active_set();
uint64_t minimum_commit_set = active_set;
std::string minimum_client_id;
for (auto &client : registered_clients) {
if (client.state == cls::journal::CLIENT_STATE_DISCONNECTED) {
continue;
}
if (client.commit_position.object_positions.empty()) {
// client hasn't recorded any commits
minimum_commit_set = minimum_set;
minimum_client_id = client.id;
break;
}
for (auto &position : client.commit_position.object_positions) {
uint64_t object_set = position.object_number / splay_width;
if (object_set < minimum_commit_set) {
minimum_client_id = client.id;
minimum_commit_set = object_set;
}
}
}
if (minimum_commit_set > minimum_set) {
trim_objects(minimum_commit_set);
} else {
ldout(m_cct, 20) << "object set " << minimum_commit_set << " still "
<< "in-use by client " << minimum_client_id << dendl;
}
}
void JournalTrimmer::handle_set_removed(int r, uint64_t object_set) {
ldout(m_cct, 20) << __func__ << ": r=" << r << ", set=" << object_set << ", "
<< "trim=" << m_remove_set << dendl;
std::lock_guard locker{m_lock};
m_remove_set_pending = false;
if (r == -ENOENT) {
// no objects within the set existed
r = 0;
}
if (r == 0) {
// advance the minimum set to the next set
m_journal_metadata->set_minimum_set(object_set + 1);
uint64_t active_set = m_journal_metadata->get_active_set();
uint64_t minimum_set = m_journal_metadata->get_minimum_set();
if (m_remove_set > minimum_set && minimum_set <= active_set) {
m_remove_set_pending = true;
remove_set(minimum_set);
}
}
if (m_remove_set_ctx != nullptr && !m_remove_set_pending) {
ldout(m_cct, 20) << "completing remove set context" << dendl;
m_remove_set_ctx->complete(r);
m_remove_set_ctx = nullptr;
}
}
JournalTrimmer::C_RemoveSet::C_RemoveSet(JournalTrimmer *_journal_trimmer,
uint64_t _object_set,
uint8_t _splay_width)
: journal_trimmer(_journal_trimmer), object_set(_object_set),
lock(ceph::make_mutex(utils::unique_lock_name("C_RemoveSet::lock", this))),
refs(_splay_width), return_value(-ENOENT) {
}
void JournalTrimmer::C_RemoveSet::complete(int r) {
lock.lock();
if (r < 0 && r != -ENOENT &&
(return_value == -ENOENT || return_value == 0)) {
return_value = r;
} else if (r == 0 && return_value == -ENOENT) {
return_value = 0;
}
if (--refs == 0) {
finish(return_value);
lock.unlock();
delete this;
} else {
lock.unlock();
}
}
} // namespace journal
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