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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#pragma once
#include <map>
#include <optional>
#include <utility>
#include <seastar/core/shared_future.hh>
#include <seastar/core/shared_ptr.hh>
#include "common/intrusive_lru.h"
#include "osd/object_state.h"
#include "crimson/common/exception.h"
#include "crimson/common/tri_mutex.h"
#include "crimson/osd/osd_operation.h"
namespace ceph {
class Formatter;
}
namespace crimson::common {
class ConfigProxy;
}
namespace crimson::osd {
class Watch;
struct SnapSetContext;
using SnapSetContextRef = boost::intrusive_ptr<SnapSetContext>;
template <typename OBC>
struct obc_to_hoid {
using type = hobject_t;
const type &operator()(const OBC &obc) {
return obc.obs.oi.soid;
}
};
struct SnapSetContext :
public boost::intrusive_ref_counter<SnapSetContext,
boost::thread_unsafe_counter>
{
hobject_t oid;
SnapSet snapset;
bool exists = false;
/**
* exists
*
* Because ObjectContext's are cached, we need to be able to express the case
* where the object to which a cached ObjectContext refers does not exist.
* ObjectContext's for yet-to-be-created objects are initialized with exists=false.
* The ObjectContext for a deleted object will have exists set to false until it falls
* out of cache (or another write recreates the object).
*/
explicit SnapSetContext(const hobject_t& o) :
oid(o), exists(false) {}
};
class ObjectContext : public ceph::common::intrusive_lru_base<
ceph::common::intrusive_lru_config<
hobject_t, ObjectContext, obc_to_hoid<ObjectContext>>>
{
private:
tri_mutex lock;
public:
ObjectState obs;
SnapSetContextRef ssc;
// the watch / notify machinery rather stays away from the hot and
// frequented paths. std::map is used mostly because of developer's
// convenience.
using watch_key_t = std::pair<uint64_t, entity_name_t>;
std::map<watch_key_t, seastar::shared_ptr<crimson::osd::Watch>> watchers;
ObjectContext(hobject_t hoid) : lock(hoid),
obs(std::move(hoid)) {}
void update_from(const ObjectContext &obc) {
obs = obc.obs;
ssc = obc.ssc;
}
const hobject_t &get_oid() const {
return obs.oi.soid;
}
bool is_head() const {
return get_oid().is_head();
}
hobject_t get_head_oid() const {
return get_oid().get_head();
}
const SnapSet &get_head_ss() const {
ceph_assert(is_head());
ceph_assert(ssc);
return ssc->snapset;
}
void set_head_state(ObjectState &&_obs, SnapSetContextRef &&_ssc) {
ceph_assert(is_head());
obs = std::move(_obs);
ssc = std::move(_ssc);
fully_loaded = true;
}
void set_clone_state(ObjectState &&_obs) {
ceph_assert(!is_head());
obs = std::move(_obs);
fully_loaded = true;
}
void set_clone_ssc(SnapSetContextRef head_ssc) {
ceph_assert(!is_head());
ssc = head_ssc;
}
/// pass the provided exception to any waiting consumers of this ObjectContext
template<typename Exception>
void interrupt(Exception ex) {
lock.abort(std::move(ex));
}
bool is_loaded() const {
return fully_loaded;
}
bool is_valid() const {
return !invalidated_by_interval_change;
}
private:
boost::intrusive::list_member_hook<> obc_accessing_hook;
uint64_t list_link_cnt = 0;
bool fully_loaded = false;
bool invalidated_by_interval_change = false;
friend class ObjectContextRegistry;
friend class ObjectContextLoader;
public:
template <typename ListType>
void append_to(ListType& list) {
if (list_link_cnt++ == 0) {
list.push_back(*this);
}
}
template <typename ListType>
void remove_from(ListType&& list) {
assert(list_link_cnt > 0);
if (--list_link_cnt == 0) {
list.erase(std::decay_t<ListType>::s_iterator_to(*this));
}
}
using obc_accessing_option_t = boost::intrusive::member_hook<
ObjectContext,
boost::intrusive::list_member_hook<>,
&ObjectContext::obc_accessing_hook>;
bool empty() const {
return !lock.is_acquired();
}
bool is_request_pending() const {
return lock.is_acquired();
}
};
using ObjectContextRef = ObjectContext::Ref;
class ObjectContextRegistry : public md_config_obs_t {
ObjectContext::lru_t obc_lru;
public:
ObjectContextRegistry(crimson::common::ConfigProxy &conf);
~ObjectContextRegistry();
std::pair<ObjectContextRef, bool> get_cached_obc(const hobject_t &hoid) {
return obc_lru.get_or_create(hoid);
}
ObjectContextRef maybe_get_cached_obc(const hobject_t &hoid) {
return obc_lru.get(hoid);
}
void clear_range(const hobject_t &from,
const hobject_t &to) {
obc_lru.clear_range(from, to);
}
void invalidate_on_interval_change() {
obc_lru.clear([](auto &obc) {
obc.invalidated_by_interval_change = true;
});
}
template <class F>
void for_each(F&& f) {
obc_lru.for_each(std::forward<F>(f));
}
const char** get_tracked_conf_keys() const final;
void handle_conf_change(const crimson::common::ConfigProxy& conf,
const std::set <std::string> &changed) final;
};
std::optional<hobject_t> resolve_oid(const SnapSet &ss,
const hobject_t &oid);
} // namespace crimson::osd
template <>
struct fmt::formatter<RWState::State> : fmt::ostream_formatter {};
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