func (devices *RbdSet) createImage(hash, baseHash string) error {
var snapshot *rbd.Snapshot
baseImgName := devices.getRbdImageName(baseHash)
imgName := devices.getRbdImageName(hash)
img := rbd.GetImage(devices.ioctx, baseImgName)
// create snapshot for hash
snapName := devices.getRbdSnapName(hash)
if err := img.Open(snapName); err != nil {
if err != rbd.RbdErrorNotFound {
log.Errorf("Rbd open image %s with snap %s failed: %v", baseImgName, snapName, err)
return err
}
// open image without snapshot name
if err = img.Open(); err != nil {
log.Errorf("Rbd open image %s failed: %v", baseImgName, err)
return err
}
// create snapshot
if snapshot, err = img.CreateSnapshot(snapName); err != nil {
log.Errorf("Rbd create snaphost %s failed: %v", snapName, err)
img.Close()
return err
}
} else {
snapshot = img.GetSnapshot(snapName)
}
// open snaphost success
defer img.Close()
// protect snapshot
if err := snapshot.Protect(); err != nil {
log.Errorf("Rbd protect snapshot %s failed: %v", snapName, err)
return err
}
// clone image
_, err := img.Clone(snapName, devices.ioctx, imgName, rbd.RbdFeatureLayering)
if err != nil {
log.Errorf("Rbd clone snapshot %s@%s to %s failed: %v", baseImgName, snapName, imgName, err)
return err
}
return nil
}
func (devices *RbdSet) deleteImage(info *DevInfo) error {
var snapshot *rbd.Snapshot
// remove image
imgName := devices.getRbdImageName(info.Hash)
img := rbd.GetImage(devices.ioctx, imgName)
if err := img.Remove(); err != nil {
log.Errorf("Rbd delete image %s failed: %v", imgName, err)
return err
}
// hash's parent
snapName := devices.getRbdSnapName(info.Hash)
baseImgName := devices.getRbdImageName(info.BaseHash)
parentImg := rbd.GetImage(devices.ioctx, baseImgName)
if err := parentImg.Open(snapName); err != nil {
log.Errorf("Rbd open image %s with snap %s failed: %v", baseImgName, snapName, err)
return err
} else {
snapshot = parentImg.GetSnapshot(snapName)
}
defer parentImg.Close()
// protect snapshot
if err := snapshot.Unprotect(); err != nil {
log.Errorf("Rbd unprotect snapshot %s failed: %v", snapName, err)
return err
}
// remove snapshot
if err := snapshot.Remove(); err != nil {
log.Errorf("Rbd remove snapshot %s failed: %v", snapName, err)
}
// unregister it
if err := devices.unRegisterDevice(info); err != nil {
return err
}
return nil
}