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rocksdb/utilities/fault_injection_fs.cc
Jay Zhuang 29102641dd Skip directory fsync for filesystem btrfs (#8903) 
Summary:
Directory fsync might be expensive on btrfs and it may not be needed.
Here are 4 directory fsync cases:
1. creating a new file: dir-fsync is not needed on btrfs, as long as the
   new file itself is synced.
2. renaming a file: dir-fsync is not needed if the renamed file is
   synced. So an API `FsyncAfterFileRename(filename, ...)` is provided
   to sync the file on btrfs. By default, it just calls dir-fsync.
3. deleting files: dir-fsync is forced by set
   `IOOptions.force_dir_fsync = true`
4. renaming multiple files (like backup and checkpoint): dir-fsync is
   forced, the same as above.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8903

Test Plan: run tests on btrfs and non btrfs

Reviewed By: ajkr

Differential Revision: D30885059

Pulled By: jay-zhuang

fbshipit-source-id: dd2730b31580b0bcaedffc318a762d7dbf25de4a
2021-11-03 12:21:27 -07:00

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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 simulate
// 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.
#include "utilities/fault_injection_fs.h"
#include <functional>
#include <utility>
#include "env/composite_env_wrapper.h"
#include "port/lang.h"
#include "port/stack_trace.h"
#include "test_util/sync_point.h"
#include "util/coding.h"
#include "util/crc32c.h"
#include "util/random.h"
#include "util/string_util.h"
#include "util/xxhash.h"
namespace ROCKSDB_NAMESPACE {
const std::string kNewFileNoOverwrite = "";
// Assume a filename, and not a directory name like "/foo/bar/"
std::string TestFSGetDirName(const std::string filename) {
size_t found = filename.find_last_of("/\\");
if (found == std::string::npos) {
return "";
} else {
return filename.substr(0, found);
}
}
// Trim the tailing "/" in the end of `str`
std::string TestFSTrimDirname(const std::string& str) {
size_t found = str.find_last_not_of("/");
if (found == std::string::npos) {
return str;
}
return str.substr(0, found + 1);
}
// Return pair <parent directory name, file name> of a full path.
std::pair<std::string, std::string> TestFSGetDirAndName(
const std::string& name) {
std::string dirname = TestFSGetDirName(name);
std::string fname = name.substr(dirname.size() + 1);
return std::make_pair(dirname, fname);
}
// Calculate the checksum of the data with corresponding checksum
// type. If name does not match, no checksum is returned.
void CalculateTypedChecksum(const ChecksumType& checksum_type, const char* data,
size_t size, std::string* checksum) {
if (checksum_type == ChecksumType::kCRC32c) {
uint32_t v_crc32c = crc32c::Extend(0, data, size);
PutFixed32(checksum, v_crc32c);
return;
} else if (checksum_type == ChecksumType::kxxHash) {
uint32_t v = XXH32(data, size, 0);
PutFixed32(checksum, v);
}
return;
}
IOStatus FSFileState::DropUnsyncedData() {
buffer_.resize(0);
return IOStatus::OK();
}
IOStatus FSFileState::DropRandomUnsyncedData(Random* rand) {
int range = static_cast<int>(buffer_.size());
size_t truncated_size = static_cast<size_t>(rand->Uniform(range));
buffer_.resize(truncated_size);
return IOStatus::OK();
}
IOStatus TestFSDirectory::Fsync(const IOOptions& options, IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
{
IOStatus in_s = fs_->InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
fs_->SyncDir(dirname_);
IOStatus s = dir_->Fsync(options, dbg);
{
IOStatus in_s = fs_->InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
return s;
}
IOStatus TestFSDirectory::FsyncWithDirOptions(
const IOOptions& options, IODebugContext* dbg,
const DirFsyncOptions& dir_fsync_options) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
{
IOStatus in_s = fs_->InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
fs_->SyncDir(dirname_);
IOStatus s = dir_->FsyncWithDirOptions(options, dbg, dir_fsync_options);
{
IOStatus in_s = fs_->InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
return s;
}
TestFSWritableFile::TestFSWritableFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>&& f,
FaultInjectionTestFS* fs)
: state_(fname),
file_opts_(file_opts),
target_(std::move(f)),
writable_file_opened_(true),
fs_(fs) {
assert(target_ != nullptr);
state_.pos_ = 0;
}
TestFSWritableFile::~TestFSWritableFile() {
if (writable_file_opened_) {
Close(IOOptions(), nullptr).PermitUncheckedError();
}
}
IOStatus TestFSWritableFile::Append(const Slice& data, const IOOptions& options,
IODebugContext* dbg) {
MutexLock l(&mutex_);
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
if (target_->use_direct_io()) {
target_->Append(data, options, dbg).PermitUncheckedError();
} else {
state_.buffer_.append(data.data(), data.size());
state_.pos_ += data.size();
fs_->WritableFileAppended(state_);
}
IOStatus io_s = fs_->InjectWriteError(state_.filename_);
return io_s;
}
// By setting the IngestDataCorruptionBeforeWrite(), the data corruption is
// simulated.
IOStatus TestFSWritableFile::Append(
const Slice& data, const IOOptions& options,
const DataVerificationInfo& verification_info, IODebugContext* dbg) {
MutexLock l(&mutex_);
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
if (fs_->ShouldDataCorruptionBeforeWrite()) {
return IOStatus::Corruption("Data is corrupted!");
}
// Calculate the checksum
std::string checksum;
CalculateTypedChecksum(fs_->GetChecksumHandoffFuncType(), data.data(),
data.size(), &checksum);
if (fs_->GetChecksumHandoffFuncType() != ChecksumType::kNoChecksum &&
checksum != verification_info.checksum.ToString()) {
std::string msg = "Data is corrupted! Origin data checksum: " +
verification_info.checksum.ToString() +
"current data checksum: " + checksum;
return IOStatus::Corruption(msg);
}
if (target_->use_direct_io()) {
target_->Append(data, options, dbg).PermitUncheckedError();
} else {
state_.buffer_.append(data.data(), data.size());
state_.pos_ += data.size();
fs_->WritableFileAppended(state_);
}
IOStatus io_s = fs_->InjectWriteError(state_.filename_);
return io_s;
}
IOStatus TestFSWritableFile::PositionedAppend(
const Slice& data, uint64_t offset, const IOOptions& options,
const DataVerificationInfo& verification_info, IODebugContext* dbg) {
MutexLock l(&mutex_);
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
if (fs_->ShouldDataCorruptionBeforeWrite()) {
return IOStatus::Corruption("Data is corrupted!");
}
// Calculate the checksum
std::string checksum;
CalculateTypedChecksum(fs_->GetChecksumHandoffFuncType(), data.data(),
data.size(), &checksum);
if (fs_->GetChecksumHandoffFuncType() != ChecksumType::kNoChecksum &&
checksum != verification_info.checksum.ToString()) {
std::string msg = "Data is corrupted! Origin data checksum: " +
verification_info.checksum.ToString() +
"current data checksum: " + checksum;
return IOStatus::Corruption(msg);
}
target_->PositionedAppend(data, offset, options, dbg);
IOStatus io_s = fs_->InjectWriteError(state_.filename_);
return io_s;
}
IOStatus TestFSWritableFile::Close(const IOOptions& options,
IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
{
IOStatus in_s = fs_->InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
writable_file_opened_ = false;
IOStatus io_s;
if (!target_->use_direct_io()) {
io_s = target_->Append(state_.buffer_, options, dbg);
}
if (io_s.ok()) {
state_.buffer_.resize(0);
// Ignore sync errors
target_->Sync(options, dbg).PermitUncheckedError();
io_s = target_->Close(options, dbg);
}
if (io_s.ok()) {
fs_->WritableFileClosed(state_);
IOStatus in_s = fs_->InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
return io_s;
}
IOStatus TestFSWritableFile::Flush(const IOOptions&, IODebugContext*) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
if (fs_->IsFilesystemActive()) {
state_.pos_at_last_flush_ = state_.pos_;
}
return IOStatus::OK();
}
IOStatus TestFSWritableFile::Sync(const IOOptions& options,
IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
if (target_->use_direct_io()) {
// For Direct IO mode, we don't buffer anything in TestFSWritableFile.
// So just return
return IOStatus::OK();
}
IOStatus io_s = target_->Append(state_.buffer_, options, dbg);
state_.buffer_.resize(0);
// Ignore sync errors
target_->Sync(options, dbg).PermitUncheckedError();
state_.pos_at_last_sync_ = state_.pos_;
fs_->WritableFileSynced(state_);
return io_s;
}
TestFSRandomRWFile::TestFSRandomRWFile(const std::string& /*fname*/,
std::unique_ptr<FSRandomRWFile>&& f,
FaultInjectionTestFS* fs)
: target_(std::move(f)), file_opened_(true), fs_(fs) {
assert(target_ != nullptr);
}
TestFSRandomRWFile::~TestFSRandomRWFile() {
if (file_opened_) {
Close(IOOptions(), nullptr).PermitUncheckedError();
}
}
IOStatus TestFSRandomRWFile::Write(uint64_t offset, const Slice& data,
const IOOptions& options,
IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
return target_->Write(offset, data, options, dbg);
}
IOStatus TestFSRandomRWFile::Read(uint64_t offset, size_t n,
const IOOptions& options, Slice* result,
char* scratch, IODebugContext* dbg) const {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
return target_->Read(offset, n, options, result, scratch, dbg);
}
IOStatus TestFSRandomRWFile::Close(const IOOptions& options,
IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
file_opened_ = false;
return target_->Close(options, dbg);
}
IOStatus TestFSRandomRWFile::Flush(const IOOptions& options,
IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
return target_->Flush(options, dbg);
}
IOStatus TestFSRandomRWFile::Sync(const IOOptions& options,
IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
return target_->Sync(options, dbg);
}
TestFSRandomAccessFile::TestFSRandomAccessFile(const std::string& /*fname*/,
std::unique_ptr<FSRandomAccessFile>&& f,
FaultInjectionTestFS* fs)
: target_(std::move(f)), fs_(fs) {
assert(target_ != nullptr);
}
IOStatus TestFSRandomAccessFile::Read(uint64_t offset, size_t n,
const IOOptions& options, Slice* result,
char* scratch,
IODebugContext* dbg) const {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
IOStatus s = target_->Read(offset, n, options, result, scratch, dbg);
if (s.ok()) {
s = fs_->InjectThreadSpecificReadError(
FaultInjectionTestFS::ErrorOperation::kRead, result, use_direct_io(),
scratch, /*need_count_increase=*/true, /*fault_injected=*/nullptr);
}
if (s.ok() && fs_->ShouldInjectRandomReadError()) {
return IOStatus::IOError("Injected read error");
}
return s;
}
IOStatus TestFSRandomAccessFile::MultiRead(FSReadRequest* reqs, size_t num_reqs,
const IOOptions& options,
IODebugContext* dbg) {
if (!fs_->IsFilesystemActive()) {
return fs_->GetError();
}
IOStatus s = target_->MultiRead(reqs, num_reqs, options, dbg);
bool injected_error = false;
for (size_t i = 0; i < num_reqs; i++) {
if (!reqs[i].status.ok()) {
// Already seeing an error.
break;
}
bool this_injected_error;
reqs[i].status = fs_->InjectThreadSpecificReadError(
FaultInjectionTestFS::ErrorOperation::kMultiReadSingleReq,
&(reqs[i].result), use_direct_io(), reqs[i].scratch,
/*need_count_increase=*/true,
/*fault_injected=*/&this_injected_error);
injected_error |= this_injected_error;
}
if (s.ok()) {
s = fs_->InjectThreadSpecificReadError(
FaultInjectionTestFS::ErrorOperation::kMultiRead, nullptr,
use_direct_io(), nullptr, /*need_count_increase=*/!injected_error,
/*fault_injected=*/nullptr);
}
if (s.ok() && fs_->ShouldInjectRandomReadError()) {
return IOStatus::IOError("Injected read error");
}
return s;
}
size_t TestFSRandomAccessFile::GetUniqueId(char* id, size_t max_size) const {
if (fs_->ShouldFailGetUniqueId()) {
return 0;
} else {
return target_->GetUniqueId(id, max_size);
}
}
IOStatus TestFSSequentialFile::Read(size_t n, const IOOptions& options,
Slice* result, char* scratch,
IODebugContext* dbg) {
IOStatus s = target()->Read(n, options, result, scratch, dbg);
if (s.ok() && fs_->ShouldInjectRandomReadError()) {
return IOStatus::IOError("Injected seq read error");
}
return s;
}
IOStatus TestFSSequentialFile::PositionedRead(uint64_t offset, size_t n,
const IOOptions& options,
Slice* result, char* scratch,
IODebugContext* dbg) {
IOStatus s =
target()->PositionedRead(offset, n, options, result, scratch, dbg);
if (s.ok() && fs_->ShouldInjectRandomReadError()) {
return IOStatus::IOError("Injected seq positioned read error");
}
return s;
}
IOStatus FaultInjectionTestFS::NewDirectory(
const std::string& name, const IOOptions& options,
std::unique_ptr<FSDirectory>* result, IODebugContext* dbg) {
std::unique_ptr<FSDirectory> r;
IOStatus io_s = target()->NewDirectory(name, options, &r, dbg);
if (!io_s.ok()) {
return io_s;
}
result->reset(
new TestFSDirectory(this, TestFSTrimDirname(name), r.release()));
return IOStatus::OK();
}
IOStatus FaultInjectionTestFS::NewWritableFile(
const std::string& fname, const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* result, IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
if (ShouldUseDiretWritable(fname)) {
return target()->NewWritableFile(fname, file_opts, result, dbg);
}
IOStatus io_s = target()->NewWritableFile(fname, file_opts, result, dbg);
if (io_s.ok()) {
result->reset(
new TestFSWritableFile(fname, file_opts, std::move(*result), this));
// WritableFileWriter* file is opened
// again then it will be truncated - so forget our saved state.
UntrackFile(fname);
{
MutexLock l(&mutex_);
open_managed_files_.insert(fname);
auto dir_and_name = TestFSGetDirAndName(fname);
auto& list = dir_to_new_files_since_last_sync_[dir_and_name.first];
// The new file could overwrite an old one. Here we simplify
// the implementation by assuming no file of this name after
// dropping unsynced files.
list[dir_and_name.second] = kNewFileNoOverwrite;
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
}
return io_s;
}
IOStatus FaultInjectionTestFS::ReopenWritableFile(
const std::string& fname, const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* result, IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
if (ShouldUseDiretWritable(fname)) {
return target()->ReopenWritableFile(fname, file_opts, result, dbg);
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
bool exists;
IOStatus io_s,
exists_s = target()->FileExists(fname, IOOptions(), nullptr /* dbg */);
if (exists_s.IsNotFound()) {
exists = false;
} else if (exists_s.ok()) {
exists = true;
} else {
io_s = exists_s;
exists = false;
}
if (io_s.ok()) {
io_s = target()->ReopenWritableFile(fname, file_opts, result, dbg);
}
// Only track files we created. Files created outside of this
// `FaultInjectionTestFS` are not eligible for tracking/data dropping
// (for example, they may contain data a previous db_stress run expects to
// be recovered). This could be extended to track/drop data appended once
// the file is under `FaultInjectionTestFS`'s control.
if (io_s.ok()) {
bool should_track;
{
MutexLock l(&mutex_);
if (db_file_state_.find(fname) != db_file_state_.end()) {
// It was written by this `FileSystem` earlier.
assert(exists);
should_track = true;
} else if (!exists) {
// It was created by this `FileSystem` just now.
should_track = true;
open_managed_files_.insert(fname);
auto dir_and_name = TestFSGetDirAndName(fname);
auto& list = dir_to_new_files_since_last_sync_[dir_and_name.first];
list[dir_and_name.second] = kNewFileNoOverwrite;
} else {
should_track = false;
}
}
if (should_track) {
result->reset(
new TestFSWritableFile(fname, file_opts, std::move(*result), this));
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
}
return io_s;
}
IOStatus FaultInjectionTestFS::NewRandomRWFile(
const std::string& fname, const FileOptions& file_opts,
std::unique_ptr<FSRandomRWFile>* result, IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
if (ShouldUseDiretWritable(fname)) {
return target()->NewRandomRWFile(fname, file_opts, result, dbg);
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
IOStatus io_s = target()->NewRandomRWFile(fname, file_opts, result, dbg);
if (io_s.ok()) {
result->reset(new TestFSRandomRWFile(fname, std::move(*result), this));
// WritableFileWriter* file is opened
// again then it will be truncated - so forget our saved state.
UntrackFile(fname);
{
MutexLock l(&mutex_);
open_managed_files_.insert(fname);
auto dir_and_name = TestFSGetDirAndName(fname);
auto& list = dir_to_new_files_since_last_sync_[dir_and_name.first];
// It could be overwriting an old file, but we simplify the
// implementation by ignoring it.
list[dir_and_name.second] = kNewFileNoOverwrite;
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
}
return io_s;
}
IOStatus FaultInjectionTestFS::NewRandomAccessFile(
const std::string& fname, const FileOptions& file_opts,
std::unique_ptr<FSRandomAccessFile>* result, IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
if (ShouldInjectRandomReadError()) {
return IOStatus::IOError("Injected error when open random access file");
}
IOStatus io_s = InjectThreadSpecificReadError(ErrorOperation::kOpen, nullptr,
false, nullptr,
/*need_count_increase=*/true,
/*fault_injected=*/nullptr);
if (io_s.ok()) {
io_s = target()->NewRandomAccessFile(fname, file_opts, result, dbg);
}
if (io_s.ok()) {
result->reset(new TestFSRandomAccessFile(fname, std::move(*result), this));
}
return io_s;
}
IOStatus FaultInjectionTestFS::NewSequentialFile(
const std::string& fname, const FileOptions& file_opts,
std::unique_ptr<FSSequentialFile>* result, IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
if (ShouldInjectRandomReadError()) {
return IOStatus::IOError("Injected read error when creating seq file");
}
IOStatus io_s = target()->NewSequentialFile(fname, file_opts, result, dbg);
if (io_s.ok()) {
result->reset(new TestFSSequentialFile(std::move(*result), this));
}
return io_s;
}
IOStatus FaultInjectionTestFS::DeleteFile(const std::string& f,
const IOOptions& options,
IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
IOStatus io_s = FileSystemWrapper::DeleteFile(f, options, dbg);
if (io_s.ok()) {
UntrackFile(f);
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
}
return io_s;
}
IOStatus FaultInjectionTestFS::RenameFile(const std::string& s,
const std::string& t,
const IOOptions& options,
IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
// We preserve contents of overwritten files up to a size threshold.
// We could keep previous file in another name, but we need to worry about
// garbage collect the those files. We do it if it is needed later.
// We ignore I/O errors here for simplicity.
std::string previous_contents = kNewFileNoOverwrite;
if (target()->FileExists(t, IOOptions(), nullptr).ok()) {
uint64_t file_size;
if (target()->GetFileSize(t, IOOptions(), &file_size, nullptr).ok() &&
file_size < 1024) {
ReadFileToString(target(), t, &previous_contents).PermitUncheckedError();
}
}
IOStatus io_s = FileSystemWrapper::RenameFile(s, t, options, dbg);
if (io_s.ok()) {
{
MutexLock l(&mutex_);
if (db_file_state_.find(s) != db_file_state_.end()) {
db_file_state_[t] = db_file_state_[s];
db_file_state_.erase(s);
}
auto sdn = TestFSGetDirAndName(s);
auto tdn = TestFSGetDirAndName(t);
if (dir_to_new_files_since_last_sync_[sdn.first].erase(sdn.second) != 0) {
auto& tlist = dir_to_new_files_since_last_sync_[tdn.first];
assert(tlist.find(tdn.second) == tlist.end());
tlist[tdn.second] = previous_contents;
}
}
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
return io_s;
}
IOStatus FaultInjectionTestFS::LinkFile(const std::string& s,
const std::string& t,
const IOOptions& options,
IODebugContext* dbg) {
if (!IsFilesystemActive()) {
return GetError();
}
{
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
// Using the value in `dir_to_new_files_since_last_sync_` for the source file
// may be a more reasonable choice.
std::string previous_contents = kNewFileNoOverwrite;
IOStatus io_s = FileSystemWrapper::LinkFile(s, t, options, dbg);
if (io_s.ok()) {
{
MutexLock l(&mutex_);
if (db_file_state_.find(s) != db_file_state_.end()) {
db_file_state_[t] = db_file_state_[s];
}
auto sdn = TestFSGetDirAndName(s);
auto tdn = TestFSGetDirAndName(t);
if (dir_to_new_files_since_last_sync_[sdn.first].find(sdn.second) !=
dir_to_new_files_since_last_sync_[sdn.first].end()) {
auto& tlist = dir_to_new_files_since_last_sync_[tdn.first];
assert(tlist.find(tdn.second) == tlist.end());
tlist[tdn.second] = previous_contents;
}
}
IOStatus in_s = InjectMetadataWriteError();
if (!in_s.ok()) {
return in_s;
}
}
return io_s;
}
void FaultInjectionTestFS::WritableFileClosed(const FSFileState& state) {
MutexLock l(&mutex_);
if (open_managed_files_.find(state.filename_) != open_managed_files_.end()) {
db_file_state_[state.filename_] = state;
open_managed_files_.erase(state.filename_);
}
}
void FaultInjectionTestFS::WritableFileSynced(const FSFileState& state) {
MutexLock l(&mutex_);
if (open_managed_files_.find(state.filename_) != open_managed_files_.end()) {
if (db_file_state_.find(state.filename_) == db_file_state_.end()) {
db_file_state_.insert(std::make_pair(state.filename_, state));
} else {
db_file_state_[state.filename_] = state;
}
}
}
void FaultInjectionTestFS::WritableFileAppended(const FSFileState& state) {
MutexLock l(&mutex_);
if (open_managed_files_.find(state.filename_) != open_managed_files_.end()) {
if (db_file_state_.find(state.filename_) == db_file_state_.end()) {
db_file_state_.insert(std::make_pair(state.filename_, state));
} else {
db_file_state_[state.filename_] = state;
}
}
}
IOStatus FaultInjectionTestFS::DropUnsyncedFileData() {
IOStatus io_s;
MutexLock l(&mutex_);
for (std::map<std::string, FSFileState>::iterator it = db_file_state_.begin();
io_s.ok() && it != db_file_state_.end(); ++it) {
FSFileState& fs_state = it->second;
if (!fs_state.IsFullySynced()) {
io_s = fs_state.DropUnsyncedData();
}
}
return io_s;
}
IOStatus FaultInjectionTestFS::DropRandomUnsyncedFileData(Random* rnd) {
IOStatus io_s;
MutexLock l(&mutex_);
for (std::map<std::string, FSFileState>::iterator it = db_file_state_.begin();
io_s.ok() && it != db_file_state_.end(); ++it) {
FSFileState& fs_state = it->second;
if (!fs_state.IsFullySynced()) {
io_s = fs_state.DropRandomUnsyncedData(rnd);
}
}
return io_s;
}
IOStatus FaultInjectionTestFS::DeleteFilesCreatedAfterLastDirSync(
const IOOptions& options, IODebugContext* dbg) {
// Because DeleteFile access this container make a copy to avoid deadlock
std::map<std::string, std::map<std::string, std::string>> map_copy;
{
MutexLock l(&mutex_);
map_copy.insert(dir_to_new_files_since_last_sync_.begin(),
dir_to_new_files_since_last_sync_.end());
}
for (auto& pair : map_copy) {
for (auto& file_pair : pair.second) {
if (file_pair.second == kNewFileNoOverwrite) {
IOStatus io_s =
DeleteFile(pair.first + "/" + file_pair.first, options, dbg);
if (!io_s.ok()) {
return io_s;
}
} else {
IOStatus io_s =
WriteStringToFile(target(), file_pair.second,
pair.first + "/" + file_pair.first, true);
if (!io_s.ok()) {
return io_s;
}
}
}
}
return IOStatus::OK();
}
void FaultInjectionTestFS::ResetState() {
MutexLock l(&mutex_);
db_file_state_.clear();
dir_to_new_files_since_last_sync_.clear();
SetFilesystemActiveNoLock(true);
}
void FaultInjectionTestFS::UntrackFile(const std::string& f) {
MutexLock l(&mutex_);
auto dir_and_name = TestFSGetDirAndName(f);
dir_to_new_files_since_last_sync_[dir_and_name.first].erase(
dir_and_name.second);
db_file_state_.erase(f);
open_managed_files_.erase(f);
}
IOStatus FaultInjectionTestFS::InjectThreadSpecificReadError(
ErrorOperation op, Slice* result, bool direct_io, char* scratch,
bool need_count_increase, bool* fault_injected) {
bool dummy_bool;
bool& ret_fault_injected = fault_injected ? *fault_injected : dummy_bool;
ret_fault_injected = false;
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
if (ctx == nullptr || !ctx->enable_error_injection || !ctx->one_in) {
return IOStatus::OK();
}
if (ctx->rand.OneIn(ctx->one_in)) {
if (ctx->count == 0) {
ctx->message = "";
}
if (need_count_increase) {
ctx->count++;
}
if (ctx->callstack) {
free(ctx->callstack);
}
ctx->callstack = port::SaveStack(&ctx->frames);
if (op != ErrorOperation::kMultiReadSingleReq) {
// Likely non-per read status code for MultiRead
ctx->message += "error; ";
ret_fault_injected = true;
return IOStatus::IOError();
} else if (Random::GetTLSInstance()->OneIn(8)) {
assert(result);
// For a small chance, set the failure to status but turn the
// result to be empty, which is supposed to be caught for a check.
*result = Slice();
ctx->message += "inject empty result; ";
ret_fault_injected = true;
} else if (!direct_io && Random::GetTLSInstance()->OneIn(7) &&
scratch != nullptr && result->data() == scratch) {
assert(result);
// With direct I/O, many extra bytes might be read so corrupting
// one byte might not cause checksum mismatch. Skip checksum
// corruption injection.
// We only corrupt data if the result is filled to `scratch`. For other
// cases, the data might not be able to be modified (e.g mmaped files)
// or has unintended side effects.
// For a small chance, set the failure to status but corrupt the
// result in a way that checksum checking is supposed to fail.
// Corrupt the last byte, which is supposed to be a checksum byte
// It would work for CRC. Not 100% sure for xxhash and will adjust
// if it is not the case.
const_cast<char*>(result->data())[result->size() - 1]++;
ctx->message += "corrupt last byte; ";
ret_fault_injected = true;
} else {
ctx->message += "error result multiget single; ";
ret_fault_injected = true;
return IOStatus::IOError();
}
}
return IOStatus::OK();
}
bool FaultInjectionTestFS::TryParseFileName(const std::string& file_name,
uint64_t* number, FileType* type) {
std::size_t found = file_name.find_last_of("/");
std::string file = file_name.substr(found);
return ParseFileName(file, number, type);
}
IOStatus FaultInjectionTestFS::InjectWriteError(const std::string& file_name) {
MutexLock l(&mutex_);
if (!enable_write_error_injection_ || !write_error_one_in_) {
return IOStatus::OK();
}
bool allowed_type = false;
if (inject_for_all_file_types_) {
allowed_type = true;
} else {
uint64_t number;
FileType cur_type = kTempFile;
if (TryParseFileName(file_name, &number, &cur_type)) {
for (const auto& type : write_error_allowed_types_) {
if (cur_type == type) {
allowed_type = true;
}
}
}
}
if (allowed_type) {
if (write_error_rand_.OneIn(write_error_one_in_)) {
return GetError();
}
}
return IOStatus::OK();
}
IOStatus FaultInjectionTestFS::InjectMetadataWriteError() {
{
MutexLock l(&mutex_);
if (!enable_metadata_write_error_injection_ ||
!metadata_write_error_one_in_ ||
!write_error_rand_.OneIn(metadata_write_error_one_in_)) {
return IOStatus::OK();
}
}
TEST_SYNC_POINT("FaultInjectionTestFS::InjectMetadataWriteError:Injected");
return IOStatus::IOError();
}
void FaultInjectionTestFS::PrintFaultBacktrace() {
#if defined(OS_LINUX)
ErrorContext* ctx =
static_cast<ErrorContext*>(thread_local_error_->Get());
if (ctx == nullptr) {
return;
}
fprintf(stderr, "Injected error type = %d\n", ctx->type);
fprintf(stderr, "Message: %s\n", ctx->message.c_str());
port::PrintAndFreeStack(ctx->callstack, ctx->frames);
ctx->callstack = nullptr;
#endif
}
} // namespace ROCKSDB_NAMESPACE
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