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cdi.go
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cdi.go
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/*
* This file is part of the KubeVirt project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package types
import (
"errors"
"fmt"
"math"
"strconv"
k8sv1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
cdiv1 "kubevirt.io/containerized-data-importer-api/pkg/apis/core/v1beta1"
)
const (
ConfigName = "config"
DefaultFSOverhead = cdiv1.Percent("0.055")
FSOverheadMsg = "Using default 5.5%% filesystem overhead for pvc size"
)
var ErrFailedToFindCdi error = errors.New("No CDI instances found")
var ErrMultipleCdiInstances error = errors.New("Detected more than one CDI instance")
func GetFilesystemOverhead(volumeMode *k8sv1.PersistentVolumeMode, storageClass *string, cdiConfig *cdiv1.CDIConfig) cdiv1.Percent {
if IsPVCBlock(volumeMode) {
return "0"
}
if storageClass == nil {
return cdiConfig.Status.FilesystemOverhead.Global
}
fsOverhead, ok := cdiConfig.Status.FilesystemOverhead.StorageClass[*storageClass]
if !ok {
return cdiConfig.Status.FilesystemOverhead.Global
}
return fsOverhead
}
func roundUpToUnit(size, unit float64) float64 {
if size < unit {
return unit
}
return math.Ceil(size/unit) * unit
}
func alignSizeUpTo1MiB(size float64) float64 {
return roundUpToUnit(size, float64(MiB))
}
func GetSizeIncludingGivenOverhead(size *resource.Quantity, overhead cdiv1.Percent) (*resource.Quantity, error) {
fsOverhead, err := strconv.ParseFloat(string(overhead), 64)
if err != nil {
return nil, fmt.Errorf("failed to parse filesystem overhead as float: %v", err)
}
totalSize := (1 + fsOverhead) * size.AsApproximateFloat64()
totalSize = alignSizeUpTo1MiB(totalSize)
return resource.NewQuantity(int64(totalSize), size.Format), nil
}
func GetSizeIncludingDefaultFSOverhead(size *resource.Quantity) (*resource.Quantity, error) {
return GetSizeIncludingGivenOverhead(size, DefaultFSOverhead)
}
func GetSizeIncludingFSOverhead(size *resource.Quantity, storageClass *string, volumeMode *k8sv1.PersistentVolumeMode, cdiConfig *cdiv1.CDIConfig) (*resource.Quantity, error) {
cdiFSOverhead := GetFilesystemOverhead(volumeMode, storageClass, cdiConfig)
return GetSizeIncludingGivenOverhead(size, cdiFSOverhead)
}