1//go:build amd64 || arm64 || riscv64
 2
 3package vfs
 4
 5import (
 6	"os"
 7
 8	"golang.org/x/sys/unix"
 9)
10
11const (
12	// https://godbolt.org/z/1PcK5vea3
13	_F2FS_IOC_START_ATOMIC_WRITE  = 62721
14	_F2FS_IOC_COMMIT_ATOMIC_WRITE = 62722
15	_F2FS_IOC_ABORT_ATOMIC_WRITE  = 62725
16	_F2FS_IOC_GET_FEATURES        = 2147808524 // -2147158772
17	_F2FS_FEATURE_ATOMIC_WRITE    = 4
18)
19
20// notest
21
22func osBatchAtomic(file *os.File) bool {
23	flags, err := unix.IoctlGetInt(int(file.Fd()), _F2FS_IOC_GET_FEATURES)
24	return err == nil && flags&_F2FS_FEATURE_ATOMIC_WRITE != 0
25}
26
27func (f *vfsFile) BeginAtomicWrite() error {
28	return unix.IoctlSetInt(int(f.Fd()), _F2FS_IOC_START_ATOMIC_WRITE, 0)
29}
30
31func (f *vfsFile) CommitAtomicWrite() error {
32	return unix.IoctlSetInt(int(f.Fd()), _F2FS_IOC_COMMIT_ATOMIC_WRITE, 0)
33}
34
35func (f *vfsFile) RollbackAtomicWrite() error {
36	return unix.IoctlSetInt(int(f.Fd()), _F2FS_IOC_ABORT_ATOMIC_WRITE, 0)
37}