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rocksdb/env/file_system.cc

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// Copyright (c) 2019-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#include "rocksdb/file_system.h"
#include "env/composite_env_wrapper.h"
#include "env/env_chroot.h"
#include "env/env_encryption_ctr.h"
#include "env/fs_readonly.h"
#include "env/mock_env.h"
#include "options/db_options.h"
#include "rocksdb/convenience.h"
#include "rocksdb/utilities/customizable_util.h"
#include "rocksdb/utilities/object_registry.h"
#include "rocksdb/utilities/options_type.h"
#include "util/string_util.h"
#include "utilities/env_timed.h"
namespace ROCKSDB_NAMESPACE {
FileSystem::FileSystem() {}
FileSystem::~FileSystem() {}
Status FileSystem::Load(const std::string& value,
std::shared_ptr<FileSystem>* result) {
return CreateFromString(ConfigOptions(), value, result);
}
#ifndef ROCKSDB_LITE
static int RegisterBuiltinFileSystems(ObjectLibrary& library,
const std::string& /*arg*/) {
library.Register<FileSystem>(
TimedFileSystem::kClassName(),
[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
std::string* /* errmsg */) {
guard->reset(new TimedFileSystem(nullptr));
return guard->get();
});
library.Register<FileSystem>(
ReadOnlyFileSystem::kClassName(),
[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
std::string* /* errmsg */) {
guard->reset(new ReadOnlyFileSystem(nullptr));
return guard->get();
});
library.Register<FileSystem>(
EncryptedFileSystem::kClassName(),
[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
std::string* errmsg) {
Status s = NewEncryptedFileSystemImpl(nullptr, nullptr, guard);
if (!s.ok()) {
*errmsg = s.ToString();
}
return guard->get();
});
#ifndef OS_WIN
library.Register<FileSystem>(
ChrootFileSystem::kClassName(),
[](const std::string& /*uri*/, std::unique_ptr<FileSystem>* guard,
std::string* /* errmsg */) {
guard->reset(new ChrootFileSystem(nullptr, ""));
return guard->get();
});
#endif // OS_WIN
size_t num_types;
return static_cast<int>(library.GetFactoryCount(&num_types));
}
#endif // ROCKSDB_LITE
Status FileSystem::CreateFromString(const ConfigOptions& config_options,
const std::string& value,
std::shared_ptr<FileSystem>* result) {
auto default_fs = FileSystem::Default();
if (default_fs->IsInstanceOf(value)) {
*result = default_fs;
return Status::OK();
} else {
#ifndef ROCKSDB_LITE
static std::once_flag once;
std::call_once(once, [&]() {
RegisterBuiltinFileSystems(*(ObjectLibrary::Default().get()), "");
});
#endif // ROCKSDB_LITE
return LoadSharedObject<FileSystem>(config_options, value, nullptr, result);
}
}
IOStatus FileSystem::ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
const FileOptions& opts,
std::unique_ptr<FSWritableFile>* result,
IODebugContext* dbg) {
IOStatus s = RenameFile(old_fname, fname, opts.io_options, dbg);
if (!s.ok()) {
return s;
}
return NewWritableFile(fname, opts, result, dbg);
}
FileOptions FileSystem::OptimizeForLogRead(
const FileOptions& file_options) const {
FileOptions optimized_file_options(file_options);
optimized_file_options.use_direct_reads = false;
return optimized_file_options;
}
FileOptions FileSystem::OptimizeForManifestRead(
const FileOptions& file_options) const {
FileOptions optimized_file_options(file_options);
optimized_file_options.use_direct_reads = false;
return optimized_file_options;
}
FileOptions FileSystem::OptimizeForLogWrite(const FileOptions& file_options,
const DBOptions& db_options) const {
FileOptions optimized_file_options(file_options);
optimized_file_options.bytes_per_sync = db_options.wal_bytes_per_sync;
optimized_file_options.writable_file_max_buffer_size =
db_options.writable_file_max_buffer_size;
return optimized_file_options;
}
FileOptions FileSystem::OptimizeForManifestWrite(
const FileOptions& file_options) const {
return file_options;
}
FileOptions FileSystem::OptimizeForCompactionTableWrite(
const FileOptions& file_options,
const ImmutableDBOptions& db_options) const {
FileOptions optimized_file_options(file_options);
optimized_file_options.use_direct_writes =
db_options.use_direct_io_for_flush_and_compaction;
return optimized_file_options;
}
FileOptions FileSystem::OptimizeForCompactionTableRead(
const FileOptions& file_options,
const ImmutableDBOptions& db_options) const {
FileOptions optimized_file_options(file_options);
optimized_file_options.use_direct_reads = db_options.use_direct_reads;
return optimized_file_options;
}
FileOptions FileSystem::OptimizeForBlobFileRead(
const FileOptions& file_options,
const ImmutableDBOptions& db_options) const {
FileOptions optimized_file_options(file_options);
optimized_file_options.use_direct_reads = db_options.use_direct_reads;
return optimized_file_options;
}
IOStatus WriteStringToFile(FileSystem* fs, const Slice& data,
const std::string& fname, bool should_sync) {
std::unique_ptr<FSWritableFile> file;
EnvOptions soptions;
IOStatus s = fs->NewWritableFile(fname, soptions, &file, nullptr);
if (!s.ok()) {
return s;
}
s = file->Append(data, IOOptions(), nullptr);
if (s.ok() && should_sync) {
s = file->Sync(IOOptions(), nullptr);
}
if (!s.ok()) {
fs->DeleteFile(fname, IOOptions(), nullptr);
}
return s;
}
IOStatus ReadFileToString(FileSystem* fs, const std::string& fname,
std::string* data) {
FileOptions soptions;
data->clear();
std::unique_ptr<FSSequentialFile> file;
IOStatus s = status_to_io_status(
fs->NewSequentialFile(fname, soptions, &file, nullptr));
if (!s.ok()) {
return s;
}
static const int kBufferSize = 8192;
char* space = new char[kBufferSize];
while (true) {
Slice fragment;
s = file->Read(kBufferSize, IOOptions(), &fragment, space,
nullptr);
if (!s.ok()) {
break;
}
data->append(fragment.data(), fragment.size());
if (fragment.empty()) {
break;
}
}
delete[] space;
return s;
}
namespace {
static std::unordered_map<std::string, OptionTypeInfo> fs_wrapper_type_info = {
#ifndef ROCKSDB_LITE
{"target",
OptionTypeInfo::AsCustomSharedPtr<FileSystem>(
0, OptionVerificationType::kByName, OptionTypeFlags::kDontSerialize)},
#endif // ROCKSDB_LITE
};
} // namespace
FileSystemWrapper::FileSystemWrapper(const std::shared_ptr<FileSystem>& t)
: target_(t) {
RegisterOptions("", &target_, &fs_wrapper_type_info);
}
Status FileSystemWrapper::PrepareOptions(const ConfigOptions& options) {
if (target_ == nullptr) {
target_ = FileSystem::Default();
}
return FileSystem::PrepareOptions(options);
}
#ifndef ROCKSDB_LITE
std::string FileSystemWrapper::SerializeOptions(
const ConfigOptions& config_options, const std::string& header) const {
auto parent = FileSystem::SerializeOptions(config_options, "");
if (config_options.IsShallow() || target_ == nullptr ||
target_->IsInstanceOf(FileSystem::kDefaultName())) {
return parent;
} else {
std::string result = header;
if (!StartsWith(parent, OptionTypeInfo::kIdPropName())) {
result.append(OptionTypeInfo::kIdPropName()).append("=");
}
result.append(parent);
if (!EndsWith(result, config_options.delimiter)) {
result.append(config_options.delimiter);
}
result.append("target=").append(target_->ToString(config_options));
return result;
}
}
#endif // ROCKSDB_LITE
DirFsyncOptions::DirFsyncOptions() { reason = kDefault; }
DirFsyncOptions::DirFsyncOptions(std::string file_renamed_new_name) {
reason = kFileRenamed;
renamed_new_name = file_renamed_new_name;
}
DirFsyncOptions::DirFsyncOptions(FsyncReason fsync_reason) {
assert(fsync_reason != kFileRenamed);
reason = fsync_reason;
}
} // namespace ROCKSDB_NAMESPACE