func TestFSync(t *testing.T) {
tc := NewTestCase(t)
defer tc.Cleanup()
contents := []byte{1, 2, 3}
if err := ioutil.WriteFile(tc.origFile, []byte(contents), 0700); err != nil {
t.Fatalf("WriteFile failed: %v", err)
}
f, err := os.OpenFile(tc.mountFile, os.O_WRONLY, 0)
if err != nil {
t.Fatalf("OpenFile(%q): %v", tc.mountFile, err)
}
defer f.Close()
if _, err := f.WriteString("hello there"); err != nil {
t.Fatalf("WriteString failed: %v", err)
}
// How to really test fsync ?
err = syscall.Fsync(int(f.Fd()))
if err != nil {
t.Errorf("fsync returned: %v", err)
}
}
func TestCreate(t *testing.T) {
t.Parallel()
f := &create1{}
mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{f})
if err != nil {
t.Fatal(err)
}
defer mnt.Close()
// uniform umask needed to make os.Create's 0666 into something
// reproducible
defer syscall.Umask(syscall.Umask(0022))
ff, err := os.Create(mnt.Dir + "/foo")
if err != nil {
t.Fatalf("create1 WriteFile: %v", err)
}
defer ff.Close()
err = syscall.Fsync(int(ff.Fd()))
if err != nil {
t.Fatalf("Fsync = %v", err)
}
if f.f.RecordedFsync() == (fuse.FsyncRequest{}) {
t.Errorf("never received expected fsync call")
}
ff.Close()
}
func (w *write) test(path string, t *testing.T) {
log.Printf("pre-write Create")
f, err := os.Create(path)
if err != nil {
t.Fatalf("Create: %v", err)
}
log.Printf("pre-write Write")
n, err := f.Write([]byte(hi))
if err != nil {
t.Fatalf("Write: %v", err)
}
if n != len(hi) {
t.Fatalf("short write; n=%d; hi=%d", n, len(hi))
}
err = syscall.Fsync(int(f.Fd()))
if err != nil {
t.Fatalf("Fsync = %v", err)
}
if !<-w.seen.fsync {
t.Errorf("never received expected fsync call")
}
log.Printf("pre-write Close")
err = f.Close()
if err != nil {
t.Fatalf("Close: %v", err)
}
log.Printf("post-write Close")
if got := string(gather(w.seen.data)); got != hi {
t.Errorf("writeAll = %q, want %q", got, hi)
}
}
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "%s", Help)
os.Exit(1)
}
flag.Parse()
dir, err := os.Getwd()
if err != nil {
fatal.Fatalln(err)
}
// "To flush all open files on a volume, call FlushFileBuffers with a handle to the volume.
// The caller must have administrative privileges. For more information, see Running with Special Privileges."
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364439(v=vs.85).aspx
fp := filepath.VolumeName(dir)
file, err := os.Open(fp)
if err != nil {
fatal.Fatalln(err)
}
err = syscall.Fsync(syscall.Handle(file.Fd()))
if err != nil {
fatal.Fatalln(err)
}
}
func (f *file) Fsync(flags int) (code fuse.Status) {
f.fdLock.Lock()
r := fuse.ToStatus(syscall.Fsync(int(f.fd.Fd())))
f.fdLock.Unlock()
return r
}
func (f *loopbackFile) Fsync(flags int) (code fuse.Status) {
f.lock.Lock()
r := fuse.ToStatus(syscall.Fsync(int(f.File.Fd())))
f.lock.Unlock()
return r
}
func main() {
var rval int = sysexits.OK
args := os.Args
if len(args) < 2 {
usage()
}
for _, f := range args[1:] {
if fd, err := syscall.Open(f, syscall.O_RDONLY, 0777); err != nil {
log.Printf("open %s: %v\n", f, err)
if rval == sysexits.OK {
rval = sysexits.NOINPUT
}
continue
} else {
if errf := syscall.Fsync(fd); errf != nil {
log.Printf("fsync %s:%v\n", f, errf)
if rval == sysexits.OK {
rval = sysexits.OSERR
}
}
syscall.Close(fd)
}
}
os.Exit(rval)
}
// Save the snapshot to a file
func (ss *Snapshot) save() error {
// Write machine state to temporary buffer.
// open file
file, err := os.OpenFile(ss.Path, os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return err
}
defer file.Close()
b, err := json.Marshal(ss)
// Generate checksum.
checksum := crc32.ChecksumIEEE(b)
// Write snapshot with checksum.
if _, err = fmt.Fprintf(file, "%08x\n", checksum); err != nil {
return err
}
if _, err = file.Write(b); err != nil {
return err
}
// force the change writting to disk
syscall.Fsync(int(file.Fd()))
return err
}
func ObjDeleteHandler(writer http.ResponseWriter, request *http.Request, vars map[string]string, config ServerConfig) {
hash_dir := ObjHashDir(vars, config)
if os.MkdirAll(hash_dir, 0770) != nil {
ErrorResponse(writer, 500)
return
}
file_name := fmt.Sprintf("%s/%s.ts", hash_dir, request.Header.Get("X-Timestamp"))
data_file := PrimaryFile(hash_dir)
temp_file, err := ioutil.TempFile(ObjTempDir(vars, config), "PUT")
if err != nil {
ErrorResponse(writer, 500)
return
}
defer temp_file.Close()
metadata := make(map[string]interface{})
metadata["X-Timestamp"] = request.Header.Get("X-Timestamp")
metadata["name"] = fmt.Sprintf("/%s/%s/%s", vars["account"], vars["container"], vars["obj"])
WriteMetadata(int(temp_file.Fd()), metadata)
syscall.Fsync(int(temp_file.Fd()))
syscall.Rename(temp_file.Name(), file_name)
UpdateContainer("DELETE", metadata, request, vars)
go CleanupHashDir(hash_dir)
go InvalidateHash(hash_dir)
if !strings.HasSuffix(data_file, ".data") {
ErrorResponse(writer, 404)
} else {
ErrorResponse(writer, 204)
}
}
func (f *AzukiFile) Fsync(flags int) (code fuse.Status) {
f.lock.Lock()
r := fuse.ToStatus(syscall.Fsync(int(f.File.Fd())))
f.lock.Unlock()
go event.Notify(event.Fsync, f.File.Name())
return r
}
// Save the snapshot to a file
func (ss *Snapshot) Save() error {
// Write machine state to temporary buffer.
var b bytes.Buffer
if _, err := fmt.Fprintf(&b, "%v", 2); err != nil {
return err
}
// Generate checksum.
checksum := crc32.ChecksumIEEE(b.Bytes())
// open file
file, err := os.OpenFile(ss.path, os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return err
}
defer file.Close()
// Write snapshot with checksum.
if _, err = fmt.Fprintf(file, "%08x\n%v\n%v\n", checksum, ss.lastIndex,
ss.lastTerm); err != nil {
return err
}
if _, err = file.Write(ss.state); err != nil {
return err
}
// force the change writting to disk
syscall.Fsync(int(file.Fd()))
return err
}
// Sync commits the current contents of the file to stable storage.
// Typically, this means flushing the file system's in-memory copy
// of recently written data to disk.
func (f *File) Sync() error {
if err := f.checkValid("sync"); err != nil {
return err
}
if e := syscall.Fsync(f.fd); e != nil {
return &PathError{"sync", f.name, e}
}
return nil
}
// Sync commits the current contents of the file to stable storage.
// Typically, this means flushing the file system's in-memory copy
// of recently written data to disk.
func (f *File) Sync() error {
if f == nil {
return ErrInvalid
}
if e := syscall.Fsync(f.fd); e != nil {
return NewSyscallError("fsync", e)
}
return nil
}
// Sync commits the current contents of the file to stable storage.
// Typically, this means flushing the file system's in-memory copy
// of recently written data to disk.
func (file *File) Sync() (err Error) {
if file == nil {
return EINVAL
}
if e := syscall.Fsync(file.fd); e != 0 {
return NewSyscallError("fsync", e)
}
return nil
}
// Sync commits the current contents of the file to stable storage.
// Typically, this means flushing the file system's in-memory copy
// of recently written data to disk.
func (f *File) Sync() (err error) {
if f == nil {
return syscall.EINVAL
}
if e := syscall.Fsync(f.fd); e != nil {
return NewSyscallError("fsync", e)
}
return nil
}
func (o *ObjectFile) Fsync(flags int) (code fuse.Status) {
log.Debugf("[objectfile] Fsync %s", o.name)
o.lock.Lock()
r := fuse.ToStatus(syscall.Fsync(int(o.localfile.Fd())))
o.lock.Unlock()
return r
}
func ObjPutHandler(writer http.ResponseWriter, request *http.Request, vars map[string]string, config ServerConfig) {
out_headers := writer.Header()
hash_dir := ObjHashDir(vars, config)
if os.MkdirAll(hash_dir, 0770) != nil || os.MkdirAll(ObjTempDir(vars, config), 0770) != nil {
ErrorResponse(writer, 500)
return
}
file_name := fmt.Sprintf("%s/%s.data", hash_dir, request.Header.Get("X-Timestamp"))
temp_file, err := ioutil.TempFile(ObjTempDir(vars, config), "PUT")
if err != nil {
ErrorResponse(writer, 500)
return
}
defer temp_file.Close()
metadata := make(map[string]interface{})
metadata["name"] = fmt.Sprintf("/%s/%s/%s", vars["account"], vars["container"], vars["obj"])
metadata["X-Timestamp"] = request.Header.Get("X-Timestamp")
metadata["Content-Type"] = request.Header.Get("Content-Type")
var chunk [65536]byte
total_size := uint64(0)
hash := md5.New()
for {
read_len, err := request.Body.Read(chunk[0:len(chunk)])
if err != nil || read_len <= 0 {
break
}
total_size += uint64(read_len)
hash.Write(chunk[0:read_len])
temp_file.Write(chunk[0:read_len])
}
metadata["Content-Length"] = strconv.FormatUint(total_size, 10)
metadata["ETag"] = fmt.Sprintf("%x", hash.Sum(nil))
request_etag := request.Header.Get("ETag")
if request_etag != "" && request_etag != metadata["ETag"].(string) {
ErrorResponse(writer, 422)
return
}
for key := range request.Header {
if strings.HasPrefix(key, "X-Object-") {
metadata[key] = request.Header.Get(key)
}
}
out_headers.Set("ETag", metadata["ETag"].(string))
WriteMetadata(int(temp_file.Fd()), metadata)
syscall.Fsync(int(temp_file.Fd()))
syscall.Rename(temp_file.Name(), file_name)
UpdateContainer("PUT", metadata, request, vars)
go CleanupHashDir(hash_dir)
go InvalidateHash(hash_dir)
ErrorResponse(writer, 201)
}
func main() {
log.SetFlags(0)
log.SetPrefix("swaplabel: ")
flag.Usage = usage
flag.Parse()
if flag.NArg() < 1 {
usage()
}
device := flag.Arg(0)
f, err := os.OpenFile(device, os.O_RDWR, 0644)
ck(err)
defer f.Close()
_, err = f.Seek(SWAP_MAGIC_OFFSET, io.SeekStart)
ck(err)
var magic [SWAP_MAGIC_LENGTH]byte
_, err = io.ReadAtLeast(f, magic[:], len(magic))
ck(err)
if string(magic[:]) != SWAP_MAGIC1 && string(magic[:]) != SWAP_MAGIC2 {
log.Fatalf("%s: is not a swap partition", device)
}
_, err = f.Seek(SWAP_LABEL_OFFSET, io.SeekStart)
ck(err)
if *label == "" {
var buf [SWAP_LABEL_LENGTH]byte
_, err = io.ReadAtLeast(f, buf[:], len(buf))
ck(err)
for i := range buf {
if i == SWAP_LABEL_LENGTH-1 && buf[i] != 0 {
log.Fatal("invalid label")
}
}
fmt.Println(strings.TrimRight(string(buf[:]), "\x00"))
} else {
if len(*label)+1 > SWAP_LABEL_LENGTH {
log.Fatal("label too long")
}
_, err = f.Write([]byte(*label + "\x00"))
ck(err)
}
syscall.Fsync(int(f.Fd()))
}
func (me *testCase) testFSync() {
me.tester.Log("Testing fsync.")
me.writeOrigFile()
f, err := os.OpenFile(me.mountFile, os.O_WRONLY, 0)
_, err = f.WriteString("hello there")
CheckSuccess(err)
// How to really test fsync ?
errNo := syscall.Fsync(f.Fd())
if errNo != 0 {
me.tester.Errorf("fsync returned %v", errNo)
}
f.Close()
}
func main() {
flag.Usage = usage
flag.Parse()
if flag.NArg() != 1 {
usage()
}
f, err := os.OpenFile(flag.Arg(0), os.O_RDWR, 0644)
ck(err)
defer f.Close()
fi, err := f.Stat()
ck(err)
pagesize := syscall.Getpagesize()
pages := fi.Size()/int64(pagesize) - 1
var swap [8192]byte
put4(swap[0:], 1)
put4(swap[4:], uint32(pages))
seek(f, 1024)
uuid := createUUID()
copy(swap[4*3:], uuid)
if *label != "" {
i := 0
for ; i < len(*label) && i < 16; i++ {
swap[7*4+i] = (*label)[i]
}
if i < 16 {
swap[7*4+i] = 0
}
}
write(f, swap[:129*4])
seek(f, int64(pagesize)-10)
write(f, []byte("SWAPSPACE2"))
syscall.Fsync(int(f.Fd()))
f.Close()
var str string
if *label != "" {
str = fmt.Sprintf(", LABEL=%s", *label)
}
fmt.Printf("Swapspace size: %dk%s, UUID=%s\n",
pages*(int64(pagesize)/1024), str, showUUID(uuid))
}
// Write renders the ACI with the provided key in the treestore
// Write, to avoid having a rendered ACI with old stale files, requires that
// the destination directory doesn't exist (usually Remove should be called
// before Write)
func (ts *TreeStore) Write(key string, s *Store) error {
treepath := filepath.Join(ts.path, key)
fi, _ := os.Stat(treepath)
if fi != nil {
return fmt.Errorf("treestore: path %s already exists", treepath)
}
imageID, err := types.NewHash(key)
if err != nil {
return fmt.Errorf("treestore: cannot convert key to imageID: %v", err)
}
if err := os.MkdirAll(treepath, 0755); err != nil {
return fmt.Errorf("treestore: cannot create treestore directory %s: %v", treepath, err)
}
err = aci.RenderACIWithImageID(*imageID, treepath, s)
if err != nil {
return fmt.Errorf("treestore: cannot render aci: %v", err)
}
hash, err := ts.Hash(key)
if err != nil {
return fmt.Errorf("treestore: cannot calculate tree hash: %v", err)
}
err = ioutil.WriteFile(filepath.Join(treepath, hashfilename), []byte(hash), 0644)
if err != nil {
return fmt.Errorf("treestore: cannot write hash file: %v", err)
}
// before creating the "rendered" flag file we need to ensure that all data is fsynced
dfd, err := syscall.Open(treepath, syscall.O_RDONLY, 0)
if err != nil {
return err
}
defer syscall.Close(dfd)
if err := sys.Syncfs(dfd); err != nil {
return fmt.Errorf("treestore: failed to sync data: %v", err)
}
// Create rendered file
f, err := os.Create(filepath.Join(treepath, renderedfilename))
if err != nil {
return fmt.Errorf("treestore: failed to write rendered file: %v", err)
}
f.Close()
if err := syscall.Fsync(dfd); err != nil {
return fmt.Errorf("treestore: failed to sync tree store directory: %v", err)
}
return nil
}
func TestFSync(t *testing.T) {
me := NewTestCase(t)
defer me.Cleanup()
t.Log("Testing fsync.")
me.writeOrigFile()
f, err := os.OpenFile(me.mountFile, os.O_WRONLY, 0)
_, err = f.WriteString("hello there")
CheckSuccess(err)
// How to really test fsync ?
errNo := syscall.Fsync(f.Fd())
if errNo != 0 {
t.Errorf("fsync returned %v", errNo)
}
f.Close()
}
func (f *create1) test(path string, t *testing.T) {
ff, err := os.Create(path + "/foo")
if err != nil {
t.Errorf("create1 WriteFile: %v", err)
return
}
err = syscall.Fsync(int(ff.Fd()))
if err != nil {
t.Fatalf("Fsync = %v", err)
}
if !<-f.f.seen.fsync {
t.Errorf("never received expected fsync call")
}
ff.Close()
}
func TestFSync(t *testing.T) {
tc := NewTestCase(t)
defer tc.Cleanup()
contents := []byte{1, 2, 3}
err := ioutil.WriteFile(tc.origFile, []byte(contents), 0700)
CheckSuccess(err)
f, err := os.OpenFile(tc.mountFile, os.O_WRONLY, 0)
_, err = f.WriteString("hello there")
CheckSuccess(err)
// How to really test fsync ?
err = syscall.Fsync(int(f.Fd()))
if err != nil {
t.Errorf("fsync returned: %v", err)
}
f.Close()
}
func (f *create1) test(path string, t *testing.T) {
// uniform umask needed to make os.Create's 0666 into something
// reproducible
defer syscall.Umask(syscall.Umask(0022))
ff, err := os.Create(path + "/foo")
if err != nil {
t.Errorf("create1 WriteFile: %v", err)
return
}
err = syscall.Fsync(int(ff.Fd()))
if err != nil {
t.Fatalf("Fsync = %v", err)
}
if !<-f.f.seen.fsync {
t.Errorf("never received expected fsync call")
}
ff.Close()
}
func TestWrite(t *testing.T) {
t.Parallel()
w := &write{}
mnt, err := fstestutil.MountedT(t, fstestutil.SimpleFS{fstestutil.ChildMap{"child": w}})
if err != nil {
t.Fatal(err)
}
defer mnt.Close()
f, err := os.Create(mnt.Dir + "/child")
if err != nil {
t.Fatalf("Create: %v", err)
}
defer f.Close()
n, err := f.Write([]byte(hi))
if err != nil {
t.Fatalf("Write: %v", err)
}
if n != len(hi) {
t.Fatalf("short write; n=%d; hi=%d", n, len(hi))
}
err = syscall.Fsync(int(f.Fd()))
if err != nil {
t.Fatalf("Fsync = %v", err)
}
if w.RecordedFsync() == (fuse.FsyncRequest{}) {
t.Errorf("never received expected fsync call")
}
err = f.Close()
if err != nil {
t.Fatalf("Close: %v", err)
}
if got := string(w.RecordedWriteData()); got != hi {
t.Errorf("write = %q, want %q", got, hi)
}
}
func (f *create1) test(path string, t *testing.T) {
f.name = ""
ff, err := os.Create(path + "/foo")
if err != nil {
t.Errorf("create1 WriteFile: %v", err)
return
}
err = syscall.Fsync(int(ff.Fd()))
if err != nil {
t.Fatalf("Fsync = %v", err)
}
if !f.f.gotfsync {
t.Errorf("never received expected fsync call")
}
ff.Close()
if f.name != "foo" {
t.Errorf("create1 name=%q want foo", f.name)
}
}
func main() {
flag.Usage = usage
flag.Parse()
if flag.NArg() < 1 {
usage()
}
for _, name := range flag.Args() {
f, err := os.OpenFile(name, syscall.O_RDONLY|syscall.O_NOATIME|syscall.O_NOCTTY|syscall.O_CLOEXEC, 0644)
if ek(err) {
continue
}
if *dflag {
err = syscall.Fdatasync(int(f.Fd()))
} else {
err = syscall.Fsync(int(f.Fd()))
}
ek(err)
ek(f.Close())
}
os.Exit(status)
}
func main() {
flag.Parse()
out, err := ioutil.TempFile("", "fsyncbench")
if err != nil {
log.Fatal(err)
}
err = os.Remove(out.Name())
if err != nil {
log.Fatal(err)
}
fd := int(out.Fd())
buf := []byte{'A'}
N := *pN
duration := time.Duration(0)
for i := 0; i < N; i++ {
_, err = out.Write(buf)
if err != nil {
log.Fatal(err)
}
start := time.Now()
err = syscall.Fsync(fd)
end := time.Now()
duration += end.Sub(start)
if err != nil {
log.Fatal(err)
}
}
log.Printf("That took %s for %d fsyncs", duration, N)
log.Printf("That took %s per fsync", duration/time.Duration(N))
err = out.Close()
if err != nil {
log.Fatal(err)
}
}
func runFunction(m *llgo.Module, name string) (output []string, err error) {
addExterns(m)
err = addRuntime(m)
if err != nil {
return
}
err = llvm.VerifyModule(m.Module, llvm.ReturnStatusAction)
if err != nil {
return
}
engine, err := llvm.NewJITCompiler(m.Module, 0)
if err != nil {
return
}
defer engine.Dispose()
fn := engine.FindFunction(name)
if fn.IsNil() {
err = fmt.Errorf("Couldn't find function '%s'", name)
return
}
// Redirect stdout to a pipe.
pipe_fds := make([]int, 2)
err = syscall.Pipe(pipe_fds)
if err != nil {
return
}
defer syscall.Close(pipe_fds[0])
defer syscall.Close(pipe_fds[1])
old_stdout, err := syscall.Dup(syscall.Stdout)
if err != nil {
return
}
defer syscall.Close(old_stdout)
err = syscall.Dup2(pipe_fds[1], syscall.Stdout)
if err != nil {
return
}
defer syscall.Dup2(old_stdout, syscall.Stdout)
c := make(chan string)
go readPipe(pipe_fds[0], c)
exec_args := []llvm.GenericValue{}
engine.RunStaticConstructors()
engine.RunFunction(fn, exec_args)
defer engine.RunStaticDestructors()
// Call fflush to flush stdio (printf), then sync and close the write
// end of the pipe.
fflush := engine.FindFunction("fflush")
ptr0 := unsafe.Pointer(uintptr(0))
exec_args = []llvm.GenericValue{llvm.NewGenericValueFromPointer(ptr0)}
engine.RunFunction(fflush, exec_args)
syscall.Fsync(pipe_fds[1])
syscall.Close(pipe_fds[1])
syscall.Close(syscall.Stdout)
output_str := <-c
output = strings.Split(strings.TrimSpace(output_str), "\n")
return
}