+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-/*
- * Ceph - scalable distributed file system
- *
- * Copyright (C) 2013 Inktank Storage, 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.
- *
- */
-
-#ifndef CEPH_FDCACHE_H
-#define CEPH_FDCACHE_H
-
-#include <memory>
-#include <errno.h>
-#include <cstdio>
-#include "common/config_obs.h"
-#include "common/hobject.h"
-#include "common/shared_cache.hpp"
-#include "include/compat.h"
-#include "include/intarith.h"
-
-/**
- * FD Cache
- */
-class FDCache : public md_config_obs_t {
-public:
- /**
- * FD
- *
- * Wrapper for an fd. Destructor closes the fd.
- */
- class FD {
- public:
- const int fd;
- explicit FD(int _fd) : fd(_fd) {
- ceph_assert(_fd >= 0);
- }
- int operator*() const {
- return fd;
- }
- ~FD() {
- VOID_TEMP_FAILURE_RETRY(::close(fd));
- }
- };
-
-private:
- CephContext *cct;
- const int registry_shards;
- SharedLRU<ghobject_t, FD> *registry;
-
-public:
- explicit FDCache(CephContext *cct) : cct(cct),
- registry_shards(std::max<int64_t>(cct->_conf->filestore_fd_cache_shards, 1)) {
- ceph_assert(cct);
- cct->_conf.add_observer(this);
- registry = new SharedLRU<ghobject_t, FD>[registry_shards];
- for (int i = 0; i < registry_shards; ++i) {
- registry[i].set_cct(cct);
- registry[i].set_size(
- std::max<int64_t>((cct->_conf->filestore_fd_cache_size / registry_shards), 1));
- }
- }
- ~FDCache() override {
- cct->_conf.remove_observer(this);
- delete[] registry;
- }
- typedef std::shared_ptr<FD> FDRef;
-
- FDRef lookup(const ghobject_t &hoid) {
- int registry_id = hoid.hobj.get_hash() % registry_shards;
- return registry[registry_id].lookup(hoid);
- }
-
- FDRef add(const ghobject_t &hoid, int fd, bool *existed) {
- int registry_id = hoid.hobj.get_hash() % registry_shards;
- return registry[registry_id].add(hoid, new FD(fd), existed);
- }
-
- /// clear cached fd for hoid, subsequent lookups will get an empty FD
- void clear(const ghobject_t &hoid) {
- int registry_id = hoid.hobj.get_hash() % registry_shards;
- registry[registry_id].purge(hoid);
- }
-
- /// md_config_obs_t
- const char** get_tracked_conf_keys() const override {
- static const char* KEYS[] = {
- "filestore_fd_cache_size",
- NULL
- };
- return KEYS;
- }
- void handle_conf_change(const ConfigProxy& conf,
- const std::set<std::string> &changed) override {
- if (changed.count("filestore_fd_cache_size")) {
- for (int i = 0; i < registry_shards; ++i)
- registry[i].set_size(
- std::max<int64_t>((conf->filestore_fd_cache_size / registry_shards), 1));
- }
- }
-
-};
-typedef FDCache::FDRef FDRef;
-
-#endif