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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;
template <typename OBC>
struct obc_to_hoid {
using type = hobject_t;
const type &operator()(const OBC &obc) {
return obc.obs.oi.soid;
}
};
class ObjectContext : public Blocker,
public ceph::common::intrusive_lru_base<
ceph::common::intrusive_lru_config<
hobject_t, ObjectContext, obc_to_hoid<ObjectContext>>>
{
public:
Ref head; // Ref defined as part of ceph::common::intrusive_lru_base
ObjectState obs;
std::optional<SnapSet> ss;
bool loaded : 1;
// 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(const hobject_t &hoid) : obs(hoid), loaded(false) {}
const hobject_t &get_oid() const {
return obs.oi.soid;
}
bool is_head() const {
return get_oid().is_head();
}
const SnapSet &get_ro_ss() const {
if (is_head()) {
ceph_assert(ss);
return *ss;
} else {
ceph_assert(head);
return head->get_ro_ss();
}
}
void set_head_state(ObjectState &&_obs, SnapSet &&_ss) {
ceph_assert(is_head());
obs = std::move(_obs);
ss = std::move(_ss);
loaded = true;
}
void set_clone_state(ObjectState &&_obs, Ref &&_head) {
ceph_assert(!is_head());
obs = std::move(_obs);
head = _head;
loaded = true;
}
/// pass the provided exception to any waiting consumers of this ObjectContext
template<typename Exception>
void interrupt(Exception ex) {
lock.abort(std::move(ex));
if (recovery_read_marker) {
drop_recovery_read();
}
}
private:
tri_mutex lock;
bool recovery_read_marker = false;
const char *get_type_name() const final {
return "ObjectContext";
}
void dump_detail(Formatter *f) const final;
template <typename LockF>
seastar::future<> get_lock(
Operation *op,
LockF &&lockf) {
return op->with_blocking_future(
make_blocking_future(std::forward<LockF>(lockf)));
}
public:
template<RWState::State Type, typename Func>
auto with_lock(Func&& func) {
switch (Type) {
case RWState::RWWRITE:
return seastar::with_lock(lock.for_write(), std::forward<Func>(func));
case RWState::RWREAD:
return seastar::with_lock(lock.for_read(), std::forward<Func>(func));
case RWState::RWEXCL:
return seastar::with_lock(lock.for_excl(), std::forward<Func>(func));
case RWState::RWNONE:
return seastar::futurize_invoke(func);
default:
assert(0 == "noop");
}
}
template<RWState::State Type, typename Func>
auto with_promoted_lock(Func&& func) {
switch (Type) {
case RWState::RWWRITE:
return seastar::with_lock(lock.excl_from_write(), std::forward<Func>(func));
case RWState::RWREAD:
return seastar::with_lock(lock.excl_from_read(), std::forward<Func>(func));
case RWState::RWEXCL:
return seastar::with_lock(lock.excl_from_excl(), std::forward<Func>(func));
default:
assert(0 == "noop");
}
}
bool empty() const {
return !lock.is_acquired();
}
bool is_request_pending() const {
return lock.is_acquired();
}
template <typename F>
seastar::future<> get_write_greedy(Operation *op) {
return get_lock(op, [this] {
return lock.lock_for_write(true);
});
}
bool get_recovery_read() {
if (lock.try_lock_for_read()) {
recovery_read_marker = true;
return true;
} else {
return false;
}
}
seastar::future<> wait_recovery_read() {
return lock.lock_for_read().then([this] {
recovery_read_marker = true;
});
}
void drop_recovery_read() {
assert(recovery_read_marker);
lock.unlock_for_read();
recovery_read_marker = false;
}
bool maybe_get_excl() {
return lock.try_lock_for_excl();
}
};
using ObjectContextRef = ObjectContext::Ref;
class ObjectContextRegistry : public md_config_obs_t {
ObjectContext::lru_t obc_lru;
public:
ObjectContextRegistry(crimson::common::ConfigProxy &conf);
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);
}
const char** get_tracked_conf_keys() const final;
void handle_conf_change(const crimson::common::ConfigProxy& conf,
const std::set <std::string> &changed) final;
};
} // namespace crimson::osd
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