--- /dev/null
+// -*- 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;
+ Mutex 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 JournalMetadataPtr &journal_metadata)
+ : m_cct(NULL), m_object_oid_prefix(object_oid_prefix),
+ m_journal_metadata(journal_metadata), m_metadata_listener(this),
+ m_lock("JournalTrimmer::m_lock"), 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() {
+ assert(m_shutdown);
+}
+
+void JournalTrimmer::shut_down(Context *on_finish) {
+ ldout(m_cct, 20) << __func__ << dendl;
+ {
+ Mutex::Locker locker(m_lock);
+ assert(!m_shutdown);
+ m_shutdown = true;
+ }
+
+ m_journal_metadata->remove_listener(&m_metadata_listener);
+
+ // chain the shut down sequence (reverse order)
+ on_finish = new FunctionContext([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 FunctionContext([this, force, on_finish](int r) {
+ Mutex::Locker 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) {
+ assert(m_lock.is_locked());
+
+ 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 = 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) {
+ assert(m_lock.is_locked());
+
+ 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;
+ librados::AioCompletion *comp =
+ librados::Rados::aio_create_completion(ctx, NULL,
+ utils::rados_ctx_callback);
+ int r = m_ioctx.aio_remove(oid, comp);
+ assert(r == 0);
+ comp->release();
+ }
+}
+
+void JournalTrimmer::handle_metadata_updated() {
+ ldout(m_cct, 20) << __func__ << dendl;
+
+ Mutex::Locker 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;
+
+ Mutex::Locker 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(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
Code Review / stor4nfv.git / blobdiff