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Diffstat (limited to 'src/rocksdb/env/fs_readonly.h')
-rw-r--r-- | src/rocksdb/env/fs_readonly.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/rocksdb/env/fs_readonly.h b/src/rocksdb/env/fs_readonly.h new file mode 100644 index 000000000..1bbe60784 --- /dev/null +++ b/src/rocksdb/env/fs_readonly.h @@ -0,0 +1,107 @@ +// 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 |