func (devices *DeviceSet) createRegisterDevice(hash string) (*DevInfo, error) {
deviceId, err := devices.getNextFreeDeviceId()
if err != nil {
return nil, err
}
if err := devices.openTransaction(hash, deviceId); err != nil {
glog.V(1).Infof("Error opening transaction hash = %s deviceId = %d", hash, deviceId)
devices.markDeviceIdFree(deviceId)
return nil, err
}
for {
if err := devicemapper.CreateDevice(devices.getPoolDevName(), 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.
glog.Errorf("Device Id %d exists in pool but it is supposed to be unused", deviceId)
deviceId, err = devices.getNextFreeDeviceId()
if err != nil {
return nil, err
}
// Save new device id into transaction
devices.refreshTransaction(deviceId)
continue
}
glog.V(1).Infof("Error creating device: %s", err)
devices.markDeviceIdFree(deviceId)
return nil, err
}
break
}
glog.V(1).Infof("Registering device (id %v) with FS size %v", deviceId, devices.baseFsSize)
info, err := devices.registerDevice(deviceId, hash, devices.baseFsSize, devices.OpenTransactionId)
if err != nil {
_ = devicemapper.DeleteDevice(devices.getPoolDevName(), deviceId)
devices.markDeviceIdFree(deviceId)
return nil, err
}
if err := devices.closeTransaction(); err != nil {
devices.unregisterDevice(deviceId, hash)
devicemapper.DeleteDevice(devices.getPoolDevName(), deviceId)
devices.markDeviceIdFree(deviceId)
return nil, err
}
return info, nil
}
func (devices *DeviceSet) deleteDevice(info *DevInfo) error {
if devices.doBlkDiscard {
// This is a workaround for the kernel not discarding block so
// on the thin pool when we remove a thinp device, so we do it
// manually
if err := devices.activateDeviceIfNeeded(info); err == nil {
if err := devicemapper.BlockDeviceDiscard(info.DevName()); err != nil {
glog.V(1).Infof("Error discarding block on device: %s (ignoring)", err)
}
}
}
devinfo, _ := devicemapper.GetInfo(info.Name())
if devinfo != nil && devinfo.Exists != 0 {
if err := devices.removeDevice(info.Name()); err != nil {
glog.V(1).Infof("Error removing device: %s", err)
return err
}
}
if err := devices.openTransaction(info.Hash, info.DeviceId); err != nil {
glog.V(1).Infof("Error opening transaction hash = %s deviceId = %d", "", info.DeviceId)
return err
}
if err := devicemapper.DeleteDevice(devices.getPoolDevName(), info.DeviceId); err != nil {
glog.V(1).Infof("Error deleting device: %s", err)
return err
}
if err := devices.unregisterDevice(info.DeviceId, info.Hash); err != nil {
return err
}
if err := devices.closeTransaction(); err != nil {
return err
}
devices.markDeviceIdFree(info.DeviceId)
return nil
}
func (devices *DeviceSet) rollbackTransaction() error {
glog.V(1).Infof("Rolling back open transaction: TransactionId=%d hash=%s device_id=%d", devices.OpenTransactionId, devices.DeviceIdHash, devices.DeviceId)
// A device id might have already been deleted before transaction
// closed. In that case this call will fail. Just leave a message
// in case of failure.
if err := devicemapper.DeleteDevice(devices.getPoolDevName(), devices.DeviceId); err != nil {
glog.Errorf("Unable to delete device: %s", err)
}
dinfo := &DevInfo{Hash: devices.DeviceIdHash}
if err := devices.removeMetadata(dinfo); err != nil {
glog.Errorf("Unable to remove metadata: %s", err)
} else {
devices.markDeviceIdFree(devices.DeviceId)
}
if err := devices.removeTransactionMetaData(); err != nil {
glog.Errorf("Unable to remove transaction meta file %s: %s", devices.transactionMetaFile(), err)
}
return nil
}