func (d *Driver) deactivatePool() error {
dev := d.Device
volumeIDs := dev.listVolumeIDs()
for _, id := range volumeIDs {
volume := dev.loadVolume(id)
if volume == nil {
return generateError(logrus.Fields{
LOG_FIELD_VOLUME: id,
}, "Cannot find volume")
}
if err := devicemapper.RemoveDevice(id); err != nil {
return err
}
log.WithFields(logrus.Fields{
LOG_FIELD_EVENT: LOG_EVENT_ACTIVATE,
LOG_FIELD_VOLUME: id,
}).Debug("Deactivated volume device")
}
if err := removePool(dev.ThinpoolDevice); err != nil {
return err
}
log.Debug("Deactivate the pool ", dev.ThinpoolDevice)
return nil
}
// Issues the underlying dm remove operation and then waits
// for it to finish.
func (devices *DeviceSet) removeDeviceAndWait(devname string) error {
var err error
for i := 0; i < 1000; i++ {
err = devicemapper.RemoveDevice(devname)
if err == nil {
break
}
if err != devicemapper.ErrBusy {
return err
}
// If we see EBUSY it may be a transient error,
// sleep a bit a retry a few times.
devices.Unlock()
time.Sleep(10 * time.Millisecond)
devices.Lock()
}
if err != nil {
return err
}
if err := devices.waitRemove(devname); err != nil {
return err
}
return nil
}
func removePool(poolName string) error {
err := devicemapper.RemoveDevice(poolName)
if err != nil {
return err
}
log.Debugln("Removed pool /dev/mapper/" + poolName)
return nil
}
func (d *Driver) DeleteVolume(id string) error {
var err error
volume := d.loadVolume(id)
if volume == nil {
return generateError(logrus.Fields{
LOG_FIELD_VOLUME: id,
}, "cannot find volume")
}
if len(volume.Snapshots) != 0 {
for snapshotUUID := range volume.Snapshots {
if err = d.DeleteSnapshot(snapshotUUID, volume.UUID); err != nil {
return generateError(logrus.Fields{
LOG_FIELD_VOLUME: volume.UUID,
LOG_FIELD_SNAPSHOT: snapshotUUID,
}, "cannot remove an snapshot of volume, as part of deletion of volume")
}
}
}
if err = devicemapper.RemoveDevice(id); err != nil {
return err
}
log.WithFields(logrus.Fields{
LOG_FIELD_REASON: LOG_REASON_START,
LOG_FIELD_EVENT: LOG_EVENT_REMOVE,
LOG_FIELD_OBJECT: LOG_OBJECT_VOLUME,
LOG_FIELD_VOLUME: id,
DM_LOG_FIELD_VOLUME_DEVID: volume.DevID,
}).Debugf("Deleting device")
err = devicemapper.DeleteDevice(d.ThinpoolDevice, volume.DevID)
if err != nil {
return err
}
if volume.Base != "" {
image := d.loadImage(volume.Base)
if image == nil {
return generateError(logrus.Fields{
LOG_FIELD_IMAGE: volume.Base,
}, "Cannot find volume's base image")
}
if _, exists := image.VolumeRef[volume.UUID]; !exists {
return generateError(logrus.Fields{
LOG_FIELD_IMAGE: volume.Base,
LOG_FIELD_VOLUME: volume.UUID,
}, "Volume's base image doesn't refer volumev")
}
delete(image.VolumeRef, volume.UUID)
}
if err := d.deleteVolume(id); err != nil {
return err
}
return nil
}
func (devices *DeviceSet) deactivatePool() error {
log.Debugf("[devmapper] deactivatePool()")
defer log.Debugf("[devmapper] deactivatePool END")
devname := devices.getPoolDevName()
devinfo, err := devicemapper.GetInfo(devname)
if err != nil {
return err
}
if d, err := devicemapper.GetDeps(devname); err == nil {
// Access to more Debug output
log.Debugf("[devmapper] devicemapper.GetDeps() %s: %#v", devname, d)
}
if devinfo.Exists != 0 {
return devicemapper.RemoveDevice(devname)
}
return nil
}
func (d *Driver) removeDevice(name string) error {
if err := devicemapper.BlockDeviceDiscard(name); err != nil {
log.Debugf("Error %s when discarding %v, ignored", err, name)
}
for i := 0; i < 200; i++ {
err := devicemapper.RemoveDevice(name)
if err == nil {
break
}
if err != devicemapper.ErrBusy {
return err
}
// If we see EBUSY it may be a transient error,
// sleep a bit a retry a few times.
time.Sleep(100 * time.Millisecond)
}
return nil
}
func (d *Driver) CloseSnapshot(id, volumeID string) error {
snapshot, volume, err := d.getSnapshotAndVolume(id, volumeID)
if err != nil {
return err
}
log.WithFields(logrus.Fields{
LOG_FIELD_REASON: LOG_REASON_START,
LOG_FIELD_EVENT: LOG_EVENT_DEACTIVATE,
LOG_FIELD_OBJECT: LOG_OBJECT_SNAPSHOT,
LOG_FIELD_SNAPSHOT: id,
}).Debug()
if err := devicemapper.RemoveDevice(id); err != nil {
return err
}
snapshot.Activated = false
return util.ObjectSave(volume)
}
// Issues the underlying dm remove operation.
func (devices *DeviceSet) removeDevice(devname string) error {
var err error
logrus.Debugf("[devmapper] removeDevice START(%s)", devname)
defer logrus.Debugf("[devmapper] removeDevice END(%s)", devname)
for i := 0; i < 200; i++ {
err = devicemapper.RemoveDevice(devname)
if err == nil {
break
}
if err != devicemapper.ErrBusy {
return err
}
// If we see EBUSY it may be a transient error,
// sleep a bit a retry a few times.
devices.Unlock()
time.Sleep(100 * time.Millisecond)
devices.Lock()
}
return err
}
func main() {
root := flag.String("r", "/var/lib/docker", "Docker root dir")
flDebug := flag.Bool("D", false, "Debug mode")
flag.Parse()
if *flDebug {
os.Setenv("DEBUG", "1")
logrus.SetLevel(logrus.DebugLevel)
}
if flag.NArg() < 1 {
usage()
}
args := flag.Args()
home := path.Join(*root, "devicemapper")
devices, err := devmapper.NewDeviceSet(home, false, nil, nil, nil)
if err != nil {
fmt.Println("Can't initialize device mapper: ", err)
os.Exit(1)
}
switch args[0] {
case "status":
status := devices.Status()
fmt.Printf("Pool name: %s\n", status.PoolName)
fmt.Printf("Data Loopback file: %s\n", status.DataLoopback)
fmt.Printf("Metadata Loopback file: %s\n", status.MetadataLoopback)
fmt.Printf("Sector size: %d\n", status.SectorSize)
fmt.Printf("Data use: %d of %d (%.1f %%)\n", status.Data.Used, status.Data.Total, 100.0*float64(status.Data.Used)/float64(status.Data.Total))
fmt.Printf("Metadata use: %d of %d (%.1f %%)\n", status.Metadata.Used, status.Metadata.Total, 100.0*float64(status.Metadata.Used)/float64(status.Metadata.Total))
break
case "list":
ids := devices.List()
sort.Strings(ids)
for _, id := range ids {
fmt.Println(id)
}
break
case "device":
if flag.NArg() < 2 {
usage()
}
status, err := devices.GetDeviceStatus(args[1])
if err != nil {
fmt.Println("Can't get device info: ", err)
os.Exit(1)
}
fmt.Printf("Id: %d\n", status.DeviceID)
fmt.Printf("Size: %d\n", status.Size)
fmt.Printf("Transaction Id: %d\n", status.TransactionID)
fmt.Printf("Size in Sectors: %d\n", status.SizeInSectors)
fmt.Printf("Mapped Sectors: %d\n", status.MappedSectors)
fmt.Printf("Highest Mapped Sector: %d\n", status.HighestMappedSector)
break
case "resize":
if flag.NArg() < 2 {
usage()
}
size, err := byteSizeFromString(args[1])
if err != nil {
fmt.Println("Invalid size: ", err)
os.Exit(1)
}
err = devices.ResizePool(size)
if err != nil {
fmt.Println("Error resizing pool: ", err)
os.Exit(1)
}
break
case "snap":
if flag.NArg() < 3 {
usage()
}
err := devices.AddDevice(args[1], args[2])
if err != nil {
fmt.Println("Can't create snap device: ", err)
os.Exit(1)
}
break
case "remove":
if flag.NArg() < 2 {
usage()
}
err := devicemapper.RemoveDevice(args[1])
if err != nil {
fmt.Println("Can't remove device: ", err)
os.Exit(1)
}
break
case "mount":
if flag.NArg() < 3 {
usage()
}
err := devices.MountDevice(args[1], args[2], "")
if err != nil {
fmt.Println("Can't create snap device: ", err)
os.Exit(1)
}
break
default:
fmt.Printf("Unknown command %s\n", args[0])
usage()
os.Exit(1)
}
return
}