func (devices *DeviceSet) AddDevice(hash, baseHash string) error {
baseInfo, err := devices.lookupDevice(baseHash)
if err != nil {
return err
}
baseInfo.lock.Lock()
defer baseInfo.lock.Unlock()
devices.Lock()
defer devices.Unlock()
if info, _ := devices.lookupDevice(hash); info != nil {
return fmt.Errorf("device %s already exists", hash)
}
deviceId := devices.NextDeviceId
if err := devicemapper.CreateSnapDevice(devices.getPoolDevName(), &deviceId, baseInfo.Name(), baseInfo.DeviceId); err != nil {
log.Debugf("Error creating snap device: %s", err)
return err
}
// Ids are 24bit, so wrap around
devices.NextDeviceId = (deviceId + 1) & 0xffffff
if _, err := devices.registerDevice(deviceId, hash, baseInfo.Size); err != nil {
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceId)
log.Debugf("Error registering device: %s", err)
return err
}
return nil
}
func (d *Driver) CreateSnapshot(req Request) error {
var err error
d.mutex.Lock()
defer d.mutex.Unlock()
id := req.Name
volumeID, err := util.GetFieldFromOpts(OPT_VOLUME_NAME, req.Options)
if err != nil {
return err
}
volume := d.blankVolume(volumeID)
if err := util.ObjectLoad(volume); err != nil {
return err
}
devID, err := d.allocateDevID()
if err != nil {
return err
}
snapshot, exists := volume.Snapshots[id]
if exists {
return generateError(logrus.Fields{
LOG_FIELD_VOLUME: volumeID,
LOG_FIELD_SNAPSHOT: id,
}, "Already has snapshot with name")
}
log.WithFields(logrus.Fields{
LOG_FIELD_REASON: LOG_REASON_START,
LOG_FIELD_EVENT: LOG_EVENT_CREATE,
LOG_FIELD_OBJECT: LOG_OBJECT_SNAPSHOT,
LOG_FIELD_SNAPSHOT: id,
LOG_FIELD_VOLUME: volumeID,
DM_LOG_FIELD_VOLUME_DEVID: volume.DevID,
DM_LOG_FIELD_SNAPSHOT_DEVID: devID,
}).Debugf("Creating snapshot")
err = devicemapper.CreateSnapDevice(d.ThinpoolDevice, devID, volumeID, volume.DevID)
if err != nil {
return err
}
log.Debugf("Created snapshot device")
snapshot = Snapshot{
Name: id,
CreatedTime: util.Now(),
DevID: devID,
Activated: false,
}
volume.Snapshots[id] = snapshot
if err := util.ObjectSave(volume); err != nil {
return err
}
return nil
}
func (devices *DeviceSet) createRegisterSnapDevice(hash string, baseInfo *DevInfo) error {
deviceId, err := devices.getNextFreeDeviceId()
if err != nil {
return err
}
if err := devices.openTransaction(hash, deviceId); err != nil {
log.Debugf("Error opening transaction hash = %s deviceId = %d", hash, deviceId)
devices.markDeviceIdFree(deviceId)
return err
}
for {
if err := devicemapper.CreateSnapDevice(devices.getPoolDevName(), deviceId, baseInfo.Name(), baseInfo.DeviceId); err != nil {
if devicemapper.DeviceIdExists(err) {
// Device Id already exists. This should not
// happen. Now we have a mechianism to find
// a free device Id. So something is not right.
// Give a warning and continue.
log.Errorf("Warning: Device Id %d exists in pool but it is supposed to be unused", deviceId)
deviceId, err = devices.getNextFreeDeviceId()
if err != nil {
return err
}
// Save new device id into transaction
devices.refreshTransaction(deviceId)
continue
}
log.Debugf("Error creating snap device: %s", err)
devices.markDeviceIdFree(deviceId)
return err
}
break
}
if _, err := devices.registerDevice(deviceId, hash, baseInfo.Size, devices.OpenTransactionId); err != nil {
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceId)
devices.markDeviceIdFree(deviceId)
log.Debugf("Error registering device: %s", err)
return err
}
if err := devices.closeTransaction(); err != nil {
devices.unregisterDevice(deviceId, hash)
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceId)
devices.markDeviceIdFree(deviceId)
return err
}
return nil
}
func (d *Driver) CreateSnapshot(id, volumeID string) error {
var err error
volume := d.loadVolume(volumeID)
if volume == nil {
return generateError(logrus.Fields{
LOG_FIELD_VOLUME: volumeID,
}, "Cannot find volume")
}
devID, err := d.allocateDevID()
if err != nil {
return err
}
snapshot, exists := volume.Snapshots[id]
if exists {
return generateError(logrus.Fields{
LOG_FIELD_VOLUME: volumeID,
LOG_FIELD_SNAPSHOT: id,
}, "Already has snapshot with uuid")
}
log.WithFields(logrus.Fields{
LOG_FIELD_REASON: LOG_REASON_START,
LOG_FIELD_EVENT: LOG_EVENT_CREATE,
LOG_FIELD_OBJECT: LOG_OBJECT_SNAPSHOT,
LOG_FIELD_SNAPSHOT: id,
LOG_FIELD_VOLUME: volumeID,
DM_LOG_FIELD_VOLUME_DEVID: volume.DevID,
DM_LOG_FIELD_SNAPSHOT_DEVID: devID,
}).Debugf("Creating snapshot")
err = devicemapper.CreateSnapDevice(d.ThinpoolDevice, devID, volumeID, volume.DevID)
if err != nil {
return err
}
log.Debugf("Created snapshot device")
snapshot = Snapshot{
DevID: devID,
Activated: false,
}
volume.Snapshots[id] = snapshot
if err := d.saveVolume(volume); err != nil {
return err
}
return nil
}