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SetFlags and SetCompression

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This commit is contained in:
Denys Smirnov 2016-09-21 18:34:04 +03:00
parent 43632657e8
commit 41809caf7d
2 changed files with 33 additions and 2 deletions
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30
btrfs.go
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@ -11,6 +11,8 @@ import (
const SuperMagic = 0x9123683E
const xattrPrefix = "btrfs."
func Open(path string, ro bool) (*FS, error) {
if ok, err := IsSubVolume(path); err != nil {
return nil, err
@ -152,6 +154,10 @@ func (f *FS) GetFlags() (SubvolFlags, error) {
return iocSubvolGetflags(f.f)
}
func (f *FS) SetFlags(flags SubvolFlags) error {
return iocSubvolSetflags(f.f, flags)
}
func (f *FS) Sync() (err error) {
if err = ioctl.Do(f.f, _BTRFS_IOC_START_SYNC, nil); err != nil {
return
@ -194,3 +200,27 @@ func (f *FS) Receive(r io.Reader) error {
func (f *FS) ReceiveTo(r io.Reader, mount string) error {
return Receive(r, filepath.Join(f.f.Name(), mount))
}
type Compression string
const (
CompressionNone = Compression("")
LZO = Compression("lzo")
ZLIB = Compression("zlib")
)
func SetCompression(path string, v Compression) error {
var value []byte
if v != CompressionNone {
var err error
value, err = syscall.ByteSliceFromString(string(v))
if err != nil {
return err
}
}
err := syscall.Setxattr(path, xattrPrefix+"compression", value, 0)
if err != nil {
return &os.PathError{Op: "setxattr", Path: path, Err: err}
}
return nil
}

5
ioctl_h.go
View File

@ -695,8 +695,9 @@ func iocSubvolGetflags(f *os.File) (out SubvolFlags, err error) {
return
}
func iocSubvolSetflags(f *os.File, out *uint64) error {
return ioctl.Do(f, _BTRFS_IOC_SUBVOL_SETFLAGS, out)
func iocSubvolSetflags(f *os.File, flags SubvolFlags) error {
v := uint64(flags)
return ioctl.Do(f, _BTRFS_IOC_SUBVOL_SETFLAGS, &v)
}
func iocScrub(f *os.File, out *btrfs_ioctl_scrub_args) error {