mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-27 02:44:18 +00:00
f72c834eab
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/8649 Reviewed By: zhichao-cao Differential Revision: D32036059 Pulled By: mrambacher fbshipit-source-id: 4f1e7557ecac52eb849b83ae02b8d7d232112295
108 lines
4 KiB
C++
108 lines
4 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates. 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).
|
|
|
|
#pragma once
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
|
|
#include "rocksdb/file_system.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
// A FileSystem wrapper that only allows read-only operation.
|
|
//
|
|
// This class has not been fully analyzed for providing strong security
|
|
// guarantees.
|
|
class ReadOnlyFileSystem : public FileSystemWrapper {
|
|
static inline IOStatus FailReadOnly() {
|
|
IOStatus s = IOStatus::IOError("Attempted write to ReadOnlyFileSystem");
|
|
assert(s.GetRetryable() == false);
|
|
return s;
|
|
}
|
|
|
|
public:
|
|
explicit ReadOnlyFileSystem(const std::shared_ptr<FileSystem>& base)
|
|
: FileSystemWrapper(base) {}
|
|
|
|
static const char* kClassName() { return "ReadOnlyFileSystem"; }
|
|
const char* Name() const override { return kClassName(); }
|
|
|
|
IOStatus NewWritableFile(const std::string& /*fname*/,
|
|
const FileOptions& /*options*/,
|
|
std::unique_ptr<FSWritableFile>* /*result*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus ReuseWritableFile(const std::string& /*fname*/,
|
|
const std::string& /*old_fname*/,
|
|
const FileOptions& /*options*/,
|
|
std::unique_ptr<FSWritableFile>* /*result*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus NewRandomRWFile(const std::string& /*fname*/,
|
|
const FileOptions& /*options*/,
|
|
std::unique_ptr<FSRandomRWFile>* /*result*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus NewDirectory(const std::string& /*dir*/,
|
|
const IOOptions& /*options*/,
|
|
std::unique_ptr<FSDirectory>* /*result*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus DeleteFile(const std::string& /*fname*/,
|
|
const IOOptions& /*options*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus CreateDir(const std::string& /*dirname*/,
|
|
const IOOptions& /*options*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus CreateDirIfMissing(const std::string& dirname,
|
|
const IOOptions& options,
|
|
IODebugContext* dbg) override {
|
|
// Allow if dir already exists
|
|
bool is_dir = false;
|
|
IOStatus s = IsDirectory(dirname, options, &is_dir, dbg);
|
|
if (s.ok() && is_dir) {
|
|
return s;
|
|
} else {
|
|
return FailReadOnly();
|
|
}
|
|
}
|
|
IOStatus DeleteDir(const std::string& /*dirname*/,
|
|
const IOOptions& /*options*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus RenameFile(const std::string& /*src*/, const std::string& /*dest*/,
|
|
const IOOptions& /*options*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus LinkFile(const std::string& /*src*/, const std::string& /*dest*/,
|
|
const IOOptions& /*options*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus LockFile(const std::string& /*fname*/, const IOOptions& /*options*/,
|
|
FileLock** /*lock*/, IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
IOStatus NewLogger(const std::string& /*fname*/, const IOOptions& /*options*/,
|
|
std::shared_ptr<Logger>* /*result*/,
|
|
IODebugContext* /*dbg*/) override {
|
|
return FailReadOnly();
|
|
}
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|
|
#endif // ROCKSDB_LITE
|