rocksdb/utilities/fault_injection_fs.h

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// Copyright (c) 2011-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).
//
// Copyright 2014 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
// This test uses a custom FileSystem to keep track of the state of a file
// system the last "Sync". The data being written is cached in a "buffer".
// Only when "Sync" is called, the data will be persistent. It can similate
// file data loss (or entire files) not protected by a "Sync". For any of the
// FileSystem related operations, by specify the "IOStatus Error", a specific
// error can be returned when file system is not activated.
#pragma once
#include <algorithm>
#include <map>
#include <set>
#include <string>
#include "file/filename.h"
#include "include/rocksdb/file_system.h"
#include "util/mutexlock.h"
#include "util/random.h"
#include "util/thread_local.h"
namespace ROCKSDB_NAMESPACE {
class TestFSWritableFile;
class FaultInjectionTestFS;
struct FSFileState {
std::string filename_;
ssize_t pos_;
ssize_t pos_at_last_sync_;
ssize_t pos_at_last_flush_;
std::string buffer_;
explicit FSFileState(const std::string& filename)
: filename_(filename),
pos_(-1),
pos_at_last_sync_(-1),
pos_at_last_flush_(-1) {}
FSFileState() : pos_(-1), pos_at_last_sync_(-1), pos_at_last_flush_(-1) {}
bool IsFullySynced() const { return pos_ <= 0 || pos_ == pos_at_last_sync_; }
IOStatus DropUnsyncedData();
IOStatus DropRandomUnsyncedData(Random* rand);
};
// A wrapper around WritableFileWriter* file
// is written to or sync'ed.
class TestFSWritableFile : public FSWritableFile {
public:
explicit TestFSWritableFile(const std::string& fname,
std::unique_ptr<FSWritableFile>&& f,
FaultInjectionTestFS* fs);
virtual ~TestFSWritableFile();
virtual IOStatus Append(const Slice& data, const IOOptions&,
IODebugContext*) override;
virtual IOStatus Truncate(uint64_t size, const IOOptions& options,
IODebugContext* dbg) override {
return target_->Truncate(size, options, dbg);
}
virtual IOStatus Close(const IOOptions& options,
IODebugContext* dbg) override;
virtual IOStatus Flush(const IOOptions&, IODebugContext*) override;
virtual IOStatus Sync(const IOOptions& options, IODebugContext* dbg) override;
virtual bool IsSyncThreadSafe() const override { return true; }
virtual IOStatus PositionedAppend(const Slice& data, uint64_t offset,
const IOOptions& options,
IODebugContext* dbg) override {
return target_->PositionedAppend(data, offset, options, dbg);
}
virtual size_t GetRequiredBufferAlignment() const override {
return target_->GetRequiredBufferAlignment();
}
virtual bool use_direct_io() const override {
return target_->use_direct_io();
};
private:
FSFileState state_;
std::unique_ptr<FSWritableFile> target_;
bool writable_file_opened_;
FaultInjectionTestFS* fs_;
port::Mutex mutex_;
};
// A wrapper around WritableFileWriter* file
// is written to or sync'ed.
class TestFSRandomRWFile : public FSRandomRWFile {
public:
explicit TestFSRandomRWFile(const std::string& fname,
std::unique_ptr<FSRandomRWFile>&& f,
FaultInjectionTestFS* fs);
virtual ~TestFSRandomRWFile();
IOStatus Write(uint64_t offset, const Slice& data, const IOOptions& options,
IODebugContext* dbg) override;
IOStatus Read(uint64_t offset, size_t n, const IOOptions& options,
Slice* result, char* scratch,
IODebugContext* dbg) const override;
IOStatus Close(const IOOptions& options, IODebugContext* dbg) override;
IOStatus Flush(const IOOptions& options, IODebugContext* dbg) override;
IOStatus Sync(const IOOptions& options, IODebugContext* dbg) override;
size_t GetRequiredBufferAlignment() const override {
return target_->GetRequiredBufferAlignment();
}
bool use_direct_io() const override { return target_->use_direct_io(); };
private:
std::unique_ptr<FSRandomRWFile> target_;
bool file_opened_;
FaultInjectionTestFS* fs_;
};
class TestFSRandomAccessFile : public FSRandomAccessFile {
public:
explicit TestFSRandomAccessFile(const std::string& fname,
std::unique_ptr<FSRandomAccessFile>&& f,
FaultInjectionTestFS* fs);
~TestFSRandomAccessFile() override {}
IOStatus Read(uint64_t offset, size_t n, const IOOptions& options,
Slice* result, char* scratch,
IODebugContext* dbg) const override;
size_t GetRequiredBufferAlignment() const override {
return target_->GetRequiredBufferAlignment();
}
bool use_direct_io() const override { return target_->use_direct_io(); }
private:
std::unique_ptr<FSRandomAccessFile> target_;
FaultInjectionTestFS* fs_;
};
class TestFSDirectory : public FSDirectory {
public:
explicit TestFSDirectory(FaultInjectionTestFS* fs, std::string dirname,
FSDirectory* dir)
: fs_(fs), dirname_(dirname), dir_(dir) {}
~TestFSDirectory() {}
virtual IOStatus Fsync(const IOOptions& options,
IODebugContext* dbg) override;
private:
FaultInjectionTestFS* fs_;
std::string dirname_;
std::unique_ptr<FSDirectory> dir_;
};
class FaultInjectionTestFS : public FileSystemWrapper {
public:
explicit FaultInjectionTestFS(const std::shared_ptr<FileSystem>& base)
: FileSystemWrapper(base),
filesystem_active_(true),
filesystem_writable_(false),
thread_local_error_(new ThreadLocalPtr(DeleteThreadLocalErrorContext)) {
}
virtual ~FaultInjectionTestFS() { error_.PermitUncheckedError(); }
const char* Name() const override { return "FaultInjectionTestFS"; }
IOStatus NewDirectory(const std::string& name, const IOOptions& options,
std::unique_ptr<FSDirectory>* result,
IODebugContext* dbg) override;
IOStatus NewWritableFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* result,
IODebugContext* dbg) override;
IOStatus ReopenWritableFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* result,
IODebugContext* dbg) override;
IOStatus NewRandomRWFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSRandomRWFile>* result,
IODebugContext* dbg) override;
IOStatus NewRandomAccessFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSRandomAccessFile>* result,
IODebugContext* dbg) override;
virtual IOStatus DeleteFile(const std::string& f, const IOOptions& options,
IODebugContext* dbg) override;
virtual IOStatus RenameFile(const std::string& s, const std::string& t,
const IOOptions& options,
IODebugContext* dbg) override;
// Undef to eliminate clash on Windows
#undef GetFreeSpace
virtual IOStatus GetFreeSpace(const std::string& path,
const IOOptions& options, uint64_t* disk_free,
IODebugContext* dbg) override {
if (!IsFilesystemActive() && error_ == IOStatus::NoSpace()) {
*disk_free = 0;
return IOStatus::OK();
} else {
return target()->GetFreeSpace(path, options, disk_free, dbg);
}
}
void WritableFileClosed(const FSFileState& state);
void WritableFileSynced(const FSFileState& state);
void WritableFileAppended(const FSFileState& state);
IOStatus DropUnsyncedFileData();
IOStatus DropRandomUnsyncedFileData(Random* rnd);
IOStatus DeleteFilesCreatedAfterLastDirSync(const IOOptions& options,
IODebugContext* dbg);
void ResetState();
void UntrackFile(const std::string& f);
void SyncDir(const std::string& dirname) {
MutexLock l(&mutex_);
dir_to_new_files_since_last_sync_.erase(dirname);
}
// Setting the filesystem to inactive is the test equivalent to simulating a
// system reset. Setting to inactive will freeze our saved filesystem state so
// that it will stop being recorded. It can then be reset back to the state at
// the time of the reset.
bool IsFilesystemActive() {
MutexLock l(&mutex_);
return filesystem_active_;
}
// Setting filesystem_writable_ makes NewWritableFile. ReopenWritableFile,
// and NewRandomRWFile bypass FaultInjectionTestFS and go directly to the
// target FS
bool IsFilesystemDirectWritable() {
MutexLock l(&mutex_);
return filesystem_writable_;
}
void SetFilesystemActiveNoLock(
bool active, IOStatus error = IOStatus::Corruption("Not active")) {
filesystem_active_ = active;
if (!active) {
error_ = error;
}
}
void SetFilesystemActive(
bool active, IOStatus error = IOStatus::Corruption("Not active")) {
MutexLock l(&mutex_);
SetFilesystemActiveNoLock(active, error);
}
void SetFilesystemDirectWritable(
bool writable) {
MutexLock l(&mutex_);
filesystem_writable_ = writable;
}
void AssertNoOpenFile() { assert(open_files_.empty()); }
IOStatus GetError() { return error_; }
void SetFileSystemIOError(IOStatus io_error) {
MutexLock l(&mutex_);
error_ = io_error;
}
// Specify what the operation, so we can inject the right type of error
enum ErrorOperation : char {
kRead = 0,
kOpen,
};
// Set thread-local parameters for error injection. The first argument,
// seed is the seed for the random number generator, and one_in determines
// the probability of injecting error (i.e an error is injected with
// 1/one_in probability)
void SetThreadLocalReadErrorContext(uint32_t seed, int one_in) {
struct ErrorContext* ctx =
static_cast<struct ErrorContext*>(thread_local_error_->Get());
if (ctx == nullptr) {
ctx = new ErrorContext(seed);
thread_local_error_->Reset(ctx);
}
ctx->one_in = one_in;
ctx->count = 0;
}
static void DeleteThreadLocalErrorContext(void *p) {
ErrorContext* ctx = static_cast<ErrorContext*>(p);
delete ctx;
}
// Inject an error. For a READ operation, a status of IOError(), a
// corruption in the contents of scratch, or truncation of slice
// are the types of error with equal probability. For OPEN,
// its always an IOError.
IOStatus InjectError(ErrorOperation op, Slice* slice,
bool direct_io, char* scratch);
// Get the count of how many times we injected since the previous call
int GetAndResetErrorCount() {
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
int count = 0;
if (ctx != nullptr) {
count = ctx->count;
ctx->count = 0;
}
return count;
}
void EnableErrorInjection() {
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
if (ctx) {
ctx->enable_error_injection = true;
}
}
void DisableErrorInjection() {
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
if (ctx) {
ctx->enable_error_injection = false;
}
}
// We capture a backtrace every time a fault is injected, for debugging
// purposes. This call prints the backtrace to stderr and frees the
// saved callstack
void PrintFaultBacktrace();
private:
port::Mutex mutex_;
std::map<std::string, FSFileState> db_file_state_;
std::set<std::string> open_files_;
std::unordered_map<std::string, std::set<std::string>>
dir_to_new_files_since_last_sync_;
bool filesystem_active_; // Record flushes, syncs, writes
bool filesystem_writable_; // Bypass FaultInjectionTestFS and go directly
// to underlying FS for writable files
IOStatus error_;
enum ErrorType : int {
kErrorTypeStatus = 0,
kErrorTypeCorruption,
kErrorTypeTruncated,
kErrorTypeMax
};
struct ErrorContext {
Random rand;
int one_in;
int count;
bool enable_error_injection;
void* callstack;
int frames;
ErrorType type;
explicit ErrorContext(uint32_t seed)
: rand(seed),
enable_error_injection(false),
callstack(nullptr),
frames(0) {}
~ErrorContext() {
if (callstack) {
free(callstack);
}
}
};
std::unique_ptr<ThreadLocalPtr> thread_local_error_;
};
} // namespace ROCKSDB_NAMESPACE