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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
commit483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch)
treee5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/os/filestore/FDCache.h
parentInitial commit. (diff)
downloadceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.tar.xz
ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.zip
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/os/filestore/FDCache.h')
-rw-r--r--src/os/filestore/FDCache.h112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/os/filestore/FDCache.h b/src/os/filestore/FDCache.h
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+// -*- 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/Mutex.h"
+#include "common/Cond.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