loopback

Documentation

Index

• Constants
• Variables
• func AttachLoopDevice(fileName string) (loop *os.File, err error)
• func FindLoopDeviceFor(file *os.File) *os.File
• func SetCapacity(file *os.File) error

Constants

const (
	LoopSetFd       = 0x4C00
	LoopClrFd       = 0x4C01
	LoopSetStatus64 = 0x4C04
	LoopGetStatus64 = 0x4C05
	LoopSetCapacity = 0x4C07
	LoopCtlGetFree  = 0x4C82
)

IOCTL consts; taken from /usr/include/linux/loop.h

const (
	LoFlagsReadOnly  = 1
	LoFlagsAutoClear = 4
	LoFlagsPartScan  = 8
	LoKeySize        = 32
	LoNameSize       = 64
)

LOOP consts; taken from /usr/include/linux/loop.h

Variables

var (
	ErrAttachLoopbackDevice   = errors.New("loopback attach failed")
	ErrGetLoopbackBackingFile = errors.New("Unable to get loopback backing file")
	ErrSetCapacity            = errors.New("Unable set loopback capacity")
)

Loopback related errors

Functions

func AttachLoopDevice

func AttachLoopDevice(fileName string) (loop *os.File, err error)

AttachLoopDevice attaches the given squashfs file to the next available loopback device. It returns an opened *os.File of the loop device created.

func FindLoopDeviceFor

func FindLoopDeviceFor(file *os.File) *os.File

FindLoopDeviceFor returns a loopback device file for the specified file which is backing file of a loop back device.

func SetCapacity

func SetCapacity(file *os.File) error

SetCapacity reloads the size for the loopback device.