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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/rgw/rgw_bucket_sync_cache.h | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rgw/rgw_bucket_sync_cache.h')
-rw-r--r-- | src/rgw/rgw_bucket_sync_cache.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/rgw/rgw_bucket_sync_cache.h b/src/rgw/rgw_bucket_sync_cache.h new file mode 100644 index 000000000..de81d26c9 --- /dev/null +++ b/src/rgw/rgw_bucket_sync_cache.h @@ -0,0 +1,113 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab ft=cpp + +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2020 Red Hat, Inc + * + * 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. + */ + +#pragma once + +#include <boost/smart_ptr/intrusive_ref_counter.hpp> +#include "common/intrusive_lru.h" +#include "rgw_data_sync.h" + +namespace rgw::bucket_sync { + +// per bucket-shard state cached by DataSyncShardCR +struct State { + // the source bucket shard to sync + rgw_bucket_shard key; + // current sync obligation being processed by DataSyncSingleEntry + std::optional<rgw_data_sync_obligation> obligation; + // incremented with each new obligation + uint32_t counter = 0; + // highest timestamp applied by all sources + ceph::real_time progress_timestamp; + + State(const rgw_bucket_shard& key) noexcept : key(key) {} +}; + +struct Entry; +struct EntryToKey; +class Handle; + +using lru_config = ceph::common::intrusive_lru_config< + rgw_bucket_shard, Entry, EntryToKey>; + +// a recyclable cache entry +struct Entry : State, ceph::common::intrusive_lru_base<lru_config> { + using State::State; +}; + +struct EntryToKey { + using type = rgw_bucket_shard; + const type& operator()(const Entry& e) { return e.key; } +}; + +// use a non-atomic reference count since these aren't shared across threads +template <typename T> +using thread_unsafe_ref_counter = boost::intrusive_ref_counter< + T, boost::thread_unsafe_counter>; + +// a state cache for entries within a single datalog shard +class Cache : public thread_unsafe_ref_counter<Cache> { + ceph::common::intrusive_lru<lru_config> cache; + protected: + // protected ctor to enforce the use of factory function create() + explicit Cache(size_t target_size) { + cache.set_target_size(target_size); + } + public: + static boost::intrusive_ptr<Cache> create(size_t target_size) { + return new Cache(target_size); + } + + // find or create a cache entry for the given key, and return a Handle that + // keeps it lru-pinned until destruction + Handle get(const rgw_bucket_shard& key); +}; + +// a State handle that keeps the Cache referenced +class Handle { + boost::intrusive_ptr<Cache> cache; + boost::intrusive_ptr<Entry> entry; + public: + Handle() noexcept = default; + ~Handle() = default; + Handle(boost::intrusive_ptr<Cache> cache, + boost::intrusive_ptr<Entry> entry) noexcept + : cache(std::move(cache)), entry(std::move(entry)) {} + Handle(Handle&&) = default; + Handle(const Handle&) = default; + Handle& operator=(Handle&& o) noexcept { + // move the entry first so that its cache stays referenced over destruction + entry = std::move(o.entry); + cache = std::move(o.cache); + return *this; + } + Handle& operator=(const Handle& o) noexcept { + // copy the entry first so that its cache stays referenced over destruction + entry = o.entry; + cache = o.cache; + return *this; + } + + explicit operator bool() const noexcept { return static_cast<bool>(entry); } + State& operator*() const noexcept { return *entry; } + State* operator->() const noexcept { return entry.get(); } +}; + +inline Handle Cache::get(const rgw_bucket_shard& key) +{ + auto result = cache.get_or_create(key); + return {this, std::move(result.first)}; +} + +} // namespace rgw::bucket_sync |