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https://github.com/facebook/rocksdb.git
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4e60663b31
Summary: In C++, `extern` is redundant in a number of cases: * "Global" function declarations and definitions * "Global" variable definitions when already declared `extern` For consistency and simplicity, I've removed these in code that *we own*. In a couple of cases, I removed obsolete declarations, and for MagicNumber constants, I have consolidated the declarations into a header file (format.h) as standard best practice would prescribe. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12300 Test Plan: no functional changes, CI Reviewed By: ajkr Differential Revision: D53148629 Pulled By: pdillinger fbshipit-source-id: fb8d927959892e03af09b0c0d542b0a3b38fd886
187 lines
7.3 KiB
C++
187 lines
7.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// File names used by DB code
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#pragma once
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#include <stdint.h>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include "options/db_options.h"
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#include "port/port.h"
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#include "rocksdb/file_system.h"
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#include "rocksdb/options.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/status.h"
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#include "rocksdb/transaction_log.h"
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namespace ROCKSDB_NAMESPACE {
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class Env;
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class Directory;
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class SystemClock;
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class WritableFileWriter;
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#ifdef OS_WIN
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constexpr char kFilePathSeparator = '\\';
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#else
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constexpr char kFilePathSeparator = '/';
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#endif
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// Return the name of the log file with the specified number
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// in the db named by "dbname". The result will be prefixed with
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// "dbname".
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std::string LogFileName(const std::string& dbname, uint64_t number);
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std::string LogFileName(uint64_t number);
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std::string BlobFileName(uint64_t number);
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std::string BlobFileName(const std::string& bdirname, uint64_t number);
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std::string BlobFileName(const std::string& dbname, const std::string& blob_dir,
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uint64_t number);
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std::string ArchivalDirectory(const std::string& dbname);
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// Return the name of the archived log file with the specified number
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// in the db named by "dbname". The result will be prefixed with "dbname".
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std::string ArchivedLogFileName(const std::string& dbname, uint64_t num);
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std::string MakeTableFileName(const std::string& name, uint64_t number);
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std::string MakeTableFileName(uint64_t number);
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// Return the name of sstable with LevelDB suffix
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// created from RocksDB sstable suffixed name
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std::string Rocks2LevelTableFileName(const std::string& fullname);
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// the reverse function of MakeTableFileName
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// TODO(yhchiang): could merge this function with ParseFileName()
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uint64_t TableFileNameToNumber(const std::string& name);
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// Return the name of the sstable with the specified number
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// in the db named by "dbname". The result will be prefixed with
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// "dbname".
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std::string TableFileName(const std::vector<DbPath>& db_paths, uint64_t number,
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uint32_t path_id);
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// Sufficient buffer size for FormatFileNumber.
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const size_t kFormatFileNumberBufSize = 38;
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void FormatFileNumber(uint64_t number, uint32_t path_id, char* out_buf,
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size_t out_buf_size);
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// Return the name of the descriptor file for the db named by
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// "dbname" and the specified incarnation number. The result will be
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// prefixed with "dbname".
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std::string DescriptorFileName(const std::string& dbname, uint64_t number);
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std::string DescriptorFileName(uint64_t number);
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extern const std::string kCurrentFileName; // = "CURRENT"
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// Return the name of the current file. This file contains the name
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// of the current manifest file. The result will be prefixed with
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// "dbname".
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std::string CurrentFileName(const std::string& dbname);
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// Return the name of the lock file for the db named by
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// "dbname". The result will be prefixed with "dbname".
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std::string LockFileName(const std::string& dbname);
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// Return the name of a temporary file owned by the db named "dbname".
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// The result will be prefixed with "dbname".
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std::string TempFileName(const std::string& dbname, uint64_t number);
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// A helper structure for prefix of info log names.
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struct InfoLogPrefix {
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char buf[260];
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Slice prefix;
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// Prefix with DB absolute path encoded
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explicit InfoLogPrefix(bool has_log_dir, const std::string& db_absolute_path);
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// Default Prefix
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explicit InfoLogPrefix();
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};
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// Return the name of the info log file for "dbname".
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std::string InfoLogFileName(const std::string& dbname,
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const std::string& db_path = "",
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const std::string& log_dir = "");
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// Return the name of the old info log file for "dbname".
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std::string OldInfoLogFileName(const std::string& dbname, uint64_t ts,
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const std::string& db_path = "",
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const std::string& log_dir = "");
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extern const std::string kOptionsFileNamePrefix; // = "OPTIONS-"
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extern const std::string kTempFileNameSuffix; // = "dbtmp"
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// Return a options file name given the "dbname" and file number.
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// Format: OPTIONS-[number].dbtmp
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std::string OptionsFileName(const std::string& dbname, uint64_t file_num);
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std::string OptionsFileName(uint64_t file_num);
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// Return a temp options file name given the "dbname" and file number.
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// Format: OPTIONS-[number]
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std::string TempOptionsFileName(const std::string& dbname, uint64_t file_num);
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// Return the name to use for a metadatabase. The result will be prefixed with
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// "dbname".
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std::string MetaDatabaseName(const std::string& dbname, uint64_t number);
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// Return the name of the Identity file which stores a unique number for the db
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// that will get regenerated if the db loses all its data and is recreated fresh
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// either from a backup-image or empty
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std::string IdentityFileName(const std::string& dbname);
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// If filename is a rocksdb file, store the type of the file in *type.
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// The number encoded in the filename is stored in *number. If the
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// filename was successfully parsed, returns true. Else return false.
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// info_log_name_prefix is the path of info logs.
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bool ParseFileName(const std::string& filename, uint64_t* number,
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const Slice& info_log_name_prefix, FileType* type,
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WalFileType* log_type = nullptr);
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// Same as previous function, but skip info log files.
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bool ParseFileName(const std::string& filename, uint64_t* number,
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FileType* type, WalFileType* log_type = nullptr);
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// Make the CURRENT file point to the descriptor file with the
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// specified number. On its success and when dir_contains_current_file is not
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// nullptr, the function will fsync the directory containing the CURRENT file
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// when
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IOStatus SetCurrentFile(const WriteOptions& write_options, FileSystem* fs,
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const std::string& dbname, uint64_t descriptor_number,
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FSDirectory* dir_contains_current_file);
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// Make the IDENTITY file for the db
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Status SetIdentityFile(const WriteOptions& write_options, Env* env,
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const std::string& dbname,
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const std::string& db_id = {});
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// Sync manifest file `file`.
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IOStatus SyncManifest(const ImmutableDBOptions* db_options,
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const WriteOptions& write_options,
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WritableFileWriter* file);
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// Return list of file names of info logs in `file_names`.
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// The list only contains file name. The parent directory name is stored
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// in `parent_dir`.
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// `db_log_dir` should be the one as in options.db_log_dir
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Status GetInfoLogFiles(const std::shared_ptr<FileSystem>& fs,
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const std::string& db_log_dir, const std::string& dbname,
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std::string* parent_dir,
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std::vector<std::string>* file_names);
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std::string NormalizePath(const std::string& path);
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} // namespace ROCKSDB_NAMESPACE
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