driver

package

v1.6.5 Latest Latest Go to latest Published: Sep 4, 2019 License: Apache-2.0 Imports: 10 Imported by: 1

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func NewOverlayDriver(volumesDir, overlaysDir string) (volume.Driver, error)

type BtrFSDriver struct {
	// contains filtered or unexported fields
}

func NewBtrFSDriver(
	logger lager.Logger,
	btrfsBin string,
) *BtrFSDriver

func (driver *BtrFSDriver) CreateCopyOnWriteLayer(path string, parent string) error

func (driver *BtrFSDriver) CreateVolume(path string) error

func (driver *BtrFSDriver) DestroyVolume(path string) error

type NaiveDriver struct{}

func (driver *NaiveDriver) CreateCopyOnWriteLayer(path string, parent string) error

func (driver *NaiveDriver) CreateVolume(path string) error

func (driver *NaiveDriver) DestroyVolume(path string) error

type OverlayDriver struct {
	VolumesDir  string
	OverlaysDir string
}

func (driver *OverlayDriver) CreateCopyOnWriteLayer(path string, parent string) error

func (driver *OverlayDriver) CreateVolume(path string) error

func (driver *OverlayDriver) DestroyVolume(path string) error

func (driver *OverlayDriver) RecoverMountTable(liveVolumesDir string) error

We apply 2 types of mounts when using the overlay driver

For any new volume, we create its root in the overlaysDir and issue a bind mount of that root into the liveVolumesDir
For COW volumes, we create upper and work dirs and use ancestry to determine the lower dir. These dirs are used to create an overlay mount.

These mounts can disappear when the system reboots (mount table cleared) As a precaution we reattach mounts during startup to fix missing ones