devmapper

var (
	DefaultDataLoopbackSize     int64  = 100 * 1024 * 1024 * 1024
	DefaultMetaDataLoopbackSize int64  = 2 * 1024 * 1024 * 1024
	DefaultBaseFsSize           uint64 = 10 * 1024 * 1024 * 1024
)

var (
	ErrTaskRun                = errors.New("dm_task_run failed")
	ErrTaskSetName            = errors.New("dm_task_set_name failed")
	ErrTaskSetMessage         = errors.New("dm_task_set_message failed")
	ErrTaskSetAddNode         = errors.New("dm_task_set_add_node failed")
	ErrTaskSetRo              = errors.New("dm_task_set_ro failed")
	ErrTaskAddTarget          = errors.New("dm_task_add_target failed")
	ErrTaskSetSector          = errors.New("dm_task_set_sector failed")
	ErrTaskGetInfo            = errors.New("dm_task_get_info failed")
	ErrTaskSetCookie          = errors.New("dm_task_set_cookie failed")
	ErrNilCookie              = errors.New("cookie ptr can't be nil")
	ErrAttachLoopbackDevice   = errors.New("loopback mounting failed")
	ErrGetBlockSize           = errors.New("Can't get block size")
	ErrUdevWait               = errors.New("wait on udev cookie failed")
	ErrSetDevDir              = errors.New("dm_set_dev_dir failed")
	ErrGetLibraryVersion      = errors.New("dm_get_library_version failed")
	ErrCreateRemoveTask       = errors.New("Can't create task of type DeviceRemove")
	ErrRunRemoveDevice        = errors.New("running removeDevice failed")
	ErrInvalidAddNode         = errors.New("Invalide AddNoce type")
	ErrGetLoopbackBackingFile = errors.New("Unable to get loopback backing file")
	ErrLoopbackSetCapacity    = errors.New("Unable set loopback capacity")
)

var (
	DmGetLibraryVersion = dmGetLibraryVersionFct
	DmGetNextTarget     = dmGetNextTargetFct
	DmLogInitVerbose    = dmLogInitVerboseFct
	DmSetDevDir         = dmSetDevDirFct
	DmTaskAddTarget     = dmTaskAddTargetFct
	DmTaskCreate        = dmTaskCreateFct
	DmTaskDestroy       = dmTaskDestroyFct
	DmTaskGetInfo       = dmTaskGetInfoFct
	DmTaskRun           = dmTaskRunFct
	DmTaskSetAddNode    = dmTaskSetAddNodeFct
	DmTaskSetCookie     = dmTaskSetCookieFct
	DmTaskSetMessage    = dmTaskSetMessageFct
	DmTaskSetName       = dmTaskSetNameFct
	DmTaskSetRo         = dmTaskSetRoFct
	DmTaskSetSector     = dmTaskSetSectorFct
	DmUdevWait          = dmUdevWaitFct
	LogWithErrnoInit    = logWithErrnoInitFct
)

var Init = func(home string) (graphdriver.Driver, error) {
	deviceSet, err := NewDeviceSet(home, true)
	if err != nil {
		return nil, err
	}
	d := &Driver{
		DeviceSet: deviceSet,
		home:      home,
	}
	return d, nil
}

var Mounted = func(mountpoint string) (bool, error) {
	mntpoint, err := osStat(mountpoint)
	if err != nil {
		if osIsNotExist(err) {
			return false, nil
		}
		return false, err
	}
	parent, err := osStat(filepath.Join(mountpoint, ".."))
	if err != nil {
		return false, err
	}
	mntpointSt := toSysStatT(mntpoint.Sys())
	parentSt := toSysStatT(parent.Sys())
	return mntpointSt.Dev != parentSt.Dev, nil
}