// Usage knows how to measure usage associated with item.
func (p *pvcEvaluator) Usage(item runtime.Object) (api.ResourceList, error) {
result := api.ResourceList{}
pvc, err := toInternalPersistentVolumeClaimOrError(item)
if err != nil {
return result, err
}
storageClassRef := util.GetClaimStorageClass(pvc)
// charge for claim
result[api.ResourcePersistentVolumeClaims] = resource.MustParse("1")
if len(storageClassRef) > 0 {
storageClassClaim := api.ResourceName(storageClassRef + storageClassSuffix + string(api.ResourcePersistentVolumeClaims))
result[storageClassClaim] = resource.MustParse("1")
}
// charge for storage
if request, found := pvc.Spec.Resources.Requests[api.ResourceStorage]; found {
result[api.ResourceRequestsStorage] = request
// charge usage to the storage class (if present)
if len(storageClassRef) > 0 {
storageClassStorage := api.ResourceName(storageClassRef + storageClassSuffix + string(api.ResourceRequestsStorage))
result[storageClassStorage] = request
}
}
return result, nil
}
func (r *glusterfsVolumeProvisioner) Provision() (*api.PersistentVolume, error) {
var err error
if r.options.PVC.Spec.Selector != nil {
glog.V(4).Infof("glusterfs: not able to parse your claim Selector")
return nil, fmt.Errorf("glusterfs: not able to parse your claim Selector")
}
glog.V(4).Infof("glusterfs: Provison VolumeOptions %v", r.options)
scName := storageutil.GetClaimStorageClass(r.options.PVC)
cfg, err := parseClassParameters(r.options.Parameters, r.plugin.host.GetKubeClient())
if err != nil {
return nil, err
}
r.provisioningConfig = *cfg
glog.V(4).Infof("glusterfs: creating volume with configuration %+v", r.provisioningConfig)
gidTable, err := r.plugin.getGidTable(scName, cfg.gidMin, cfg.gidMax)
if err != nil {
return nil, fmt.Errorf("glusterfs: failed to get gidTable: %v", err)
}
gid, _, err := gidTable.AllocateNext()
if err != nil {
glog.Errorf("glusterfs: failed to reserve gid from table: %v", err)
return nil, fmt.Errorf("glusterfs: failed to reserve gid from table: %v", err)
}
glog.V(2).Infof("glusterfs: got gid [%d] for PVC %s", gid, r.options.PVC.Name)
glusterfs, sizeGB, err := r.CreateVolume(gid)
if err != nil {
if release_err := gidTable.Release(gid); release_err != nil {
glog.Errorf("glusterfs: error when releasing gid in storageclass: %s", scName)
}
glog.Errorf("glusterfs: create volume err: %v.", err)
return nil, fmt.Errorf("glusterfs: create volume err: %v.", err)
}
pv := new(api.PersistentVolume)
pv.Spec.PersistentVolumeSource.Glusterfs = glusterfs
pv.Spec.PersistentVolumeReclaimPolicy = r.options.PersistentVolumeReclaimPolicy
pv.Spec.AccessModes = r.options.PVC.Spec.AccessModes
if len(pv.Spec.AccessModes) == 0 {
pv.Spec.AccessModes = r.plugin.GetAccessModes()
}
gidStr := strconv.FormatInt(int64(gid), 10)
pv.Annotations = map[string]string{volumehelper.VolumeGidAnnotationKey: gidStr}
pv.Spec.Capacity = api.ResourceList{
api.ResourceName(api.ResourceStorage): resource.MustParse(fmt.Sprintf("%dGi", sizeGB)),
}
return pv, nil
}
// Constraints verifies that all required resources are present on the item.
func (p *pvcEvaluator) Constraints(required []api.ResourceName, item runtime.Object) error {
pvc, ok := item.(*api.PersistentVolumeClaim)
if !ok {
return fmt.Errorf("unexpected input object %v", item)
}
// these are the items that we will be handling based on the objects actual storage-class
pvcRequiredSet := append([]api.ResourceName{}, pvcResources...)
if storageClassRef := util.GetClaimStorageClass(pvc); len(storageClassRef) > 0 {
pvcRequiredSet = append(pvcRequiredSet, ResourceByStorageClass(storageClassRef, api.ResourcePersistentVolumeClaims))
pvcRequiredSet = append(pvcRequiredSet, ResourceByStorageClass(storageClassRef, api.ResourceRequestsStorage))
}
// in effect, this will remove things from the required set that are not tied to this pvcs storage class
// for example, if a quota has bronze and gold storage class items defined, we should not error a bronze pvc for not being gold.
// but we should error a bronze pvc if it doesn't make a storage request size...
requiredResources := quota.Intersection(required, pvcRequiredSet)
requiredSet := quota.ToSet(requiredResources)
// usage for this pvc will only include global pvc items + this storage class specific items
pvcUsage, err := p.Usage(item)
if err != nil {
return err
}
// determine what required resources were not tracked by usage.
missingSet := sets.NewString()
pvcSet := quota.ToSet(quota.ResourceNames(pvcUsage))
if diff := requiredSet.Difference(pvcSet); len(diff) > 0 {
missingSet.Insert(diff.List()...)
}
if len(missingSet) == 0 {
return nil
}
return fmt.Errorf("must specify %s", strings.Join(missingSet.List(), ","))
}
// find returns the nearest PV from the ordered list or nil if a match is not found
func (pvIndex *persistentVolumeOrderedIndex) findByClaim(claim *api.PersistentVolumeClaim, matchPredicate matchPredicate) (*api.PersistentVolume, error) {
// PVs are indexed by their access modes to allow easier searching. Each
// index is the string representation of a set of access modes. There is a
// finite number of possible sets and PVs will only be indexed in one of
// them (whichever index matches the PV's modes).
//
// A request for resources will always specify its desired access modes.
// Any matching PV must have at least that number of access modes, but it
// can have more. For example, a user asks for ReadWriteOnce but a GCEPD
// is available, which is ReadWriteOnce+ReadOnlyMany.
//
// Searches are performed against a set of access modes, so we can attempt
// not only the exact matching modes but also potential matches (the GCEPD
// example above).
allPossibleModes := pvIndex.allPossibleMatchingAccessModes(claim.Spec.AccessModes)
var smallestVolume *api.PersistentVolume
var smallestVolumeSize int64
requestedQty := claim.Spec.Resources.Requests[api.ResourceName(api.ResourceStorage)]
requestedSize := requestedQty.Value()
requestedClass := storageutil.GetClaimStorageClass(claim)
var selector labels.Selector
if claim.Spec.Selector != nil {
internalSelector, err := unversioned.LabelSelectorAsSelector(claim.Spec.Selector)
if err != nil {
// should be unreachable code due to validation
return nil, fmt.Errorf("error creating internal label selector for claim: %v: %v", claimToClaimKey(claim), err)
}
selector = internalSelector
}
for _, modes := range allPossibleModes {
volumes, err := pvIndex.listByAccessModes(modes)
if err != nil {
return nil, err
}
// Go through all available volumes with two goals:
// - find a volume that is either pre-bound by user or dynamically
// provisioned for this claim. Because of this we need to loop through
// all volumes.
// - find the smallest matching one if there is no volume pre-bound to
// the claim.
for _, volume := range volumes {
if isVolumeBoundToClaim(volume, claim) {
// this claim and volume are pre-bound; return
// the volume if the size request is satisfied,
// otherwise continue searching for a match
volumeQty := volume.Spec.Capacity[api.ResourceStorage]
volumeSize := volumeQty.Value()
if volumeSize < requestedSize {
continue
}
return volume, nil
}
// In Alpha dynamic provisioning, we do now want not match claims
// with existing PVs, findByClaim must find only PVs that are
// pre-bound to the claim (by dynamic provisioning). TODO: remove in
// 1.5
if api.HasAnnotation(claim.ObjectMeta, storageutil.AlphaStorageClassAnnotation) {
continue
}
// filter out:
// - volumes bound to another claim
// - volumes whose labels don't match the claim's selector, if specified
// - volumes in Class that is not requested
if volume.Spec.ClaimRef != nil {
continue
} else if selector != nil && !selector.Matches(labels.Set(volume.Labels)) {
continue
}
if storageutil.GetVolumeStorageClass(volume) != requestedClass {
continue
}
volumeQty := volume.Spec.Capacity[api.ResourceStorage]
volumeSize := volumeQty.Value()
if volumeSize >= requestedSize {
if smallestVolume == nil || smallestVolumeSize > volumeSize {
smallestVolume = volume
smallestVolumeSize = volumeSize
}
}
}
if smallestVolume != nil {
// Found a matching volume
return smallestVolume, nil
}
}
return nil, nil
}