if err != nil {
		return err
	}
	ino := fi.Sys().(*syscall.Stat_t).Ino

	mu.Lock()
	if i, dup := inodes[f]; dup && i != ino {
		mu.Unlock()
		return &fs.PathError{
			Op:   lt.String(),
			Path: f.Name(),
			Err:  errors.New("inode for file changed since last Lock or RLock"),
		}
	}
	inodes[f] = ino

	var wait chan File
	l := locks[ino]
	if l.owner == f {

func (fs *fileStat) ModTime() time.Time { return fs.modTime }
func (fs *fileStat) Sys() any           { return &fs.sys }

func sameFile(fs1, fs2 *fileStat) bool {
	return fs1.sys.Dev == fs2.sys.Dev && fs1.sys.Ino == fs2.sys.Ino

// license that can be found in the LICENSE file.

package os

import (
	"syscall"
	"unsafe"
)

func direntIno(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Ino), unsafe.Sizeof(syscall.Dirent{}.Ino))
}

func direntReclen(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Reclen), unsafe.Sizeof(syscall.Dirent{}.Reclen))
}

// license that can be found in the LICENSE file.

package os

import (
	"syscall"
	"unsafe"
)

func direntIno(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Ino), unsafe.Sizeof(syscall.Dirent{}.Ino))
}

func direntReclen(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Reclen), unsafe.Sizeof(syscall.Dirent{}.Reclen))
}

// license that can be found in the LICENSE file.

package os

import (
	"syscall"
	"unsafe"
)

func direntIno(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Ino), unsafe.Sizeof(syscall.Dirent{}.Ino))
}

func direntReclen(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Reclen), unsafe.Sizeof(syscall.Dirent{}.Reclen))
}

// https://github.com/WebAssembly/WASI/blob/main/legacy/preview1/docs.md#-dirent-record
const sizeOfDirent = 24

func direntIno(buf []byte) (uint64, bool) {
	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Ino), unsafe.Sizeof(syscall.Dirent{}.Ino))
}

func direntReclen(buf []byte) (uint64, bool) {
	namelen, ok := direntNamlen(buf)
	return sizeOfDirent + namelen, ok
}

func direntNamlen(buf []byte) (uint64, bool) {

		if !ok || reclen > uint64(len(buf)) {
			return origlen, count, names
		}
		rec := buf[:reclen]
		buf = buf[reclen:]
		ino, ok := direntIno(rec)
		if !ok {
			break
		}
		// See src/os/dir_unix.go for the reason why this condition is
		// excluded on wasip1.
		if ino == 0 && runtime.GOOS != "wasip1" { // File absent in directory.
			continue
		}
		const namoff = uint64(unsafe.Offsetof(Dirent{}.Name))

	Fsid    uint64
	Namelen uint64
	Frsize  uint64
	Flags   uint64
	_       [4]uint64
}

type direntLE struct {
	Reclen uint16
	Namlen uint16
	Ino    uint32
	Extra  uintptr
	Name   [256]byte
}

type Dirent struct {
	Ino    uint64
	Off    int64
	Reclen uint16
	Type   uint8
	Name   [256]uint8
	_      [5]byte
}

type FdSet struct {
	Bits [64]int32
}

		reclen, ok := direntReclen(buf)
		if !ok || reclen > uint64(len(buf)) {
			return origlen, count, names
		}
		rec := buf[:reclen]
		buf = buf[reclen:]
		ino, ok := direntIno(rec)
		if !ok {
			break
		}
		if ino == 0 { // File absent in directory.
			continue
		}
		const namoff = uint64(unsafe.Offsetof(Dirent{}.Name))
		namlen, ok := direntNamlen(rec)
		if !ok || namoff+namlen > uint64(len(rec)) {

		if s.Dev != topLevelStat.Dev {
			// don't descend into directories on other devices
			return filepath.SkipDir
		}

		// Dedupe hardlinks
		if s.Nlink > 1 {
			if _, ok := dedupedInodes[s.Ino]; !ok {
				dedupedInodes[s.Ino] = struct{}{}
			} else {
				return nil
			}
		}

		if consumption == nil {
			usage.Bytes += int64(s.Blocks) * int64(512) // blocksize in bytes
		}

		if inodes == nil {