mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-01 02:30:18 +00:00
88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
|
/*
|
||
|
|
Copyright 2021 The Kubernetes Authors.
|
||
|
|
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package volume
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
"os"
|
||
|
|
"runtime"
|
||
|
|
|
||
|
|
"k8s.io/apimachinery/pkg/api/resource"
|
||
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
||
|
|
)
|
||
|
|
|
||
|
|
var _ MetricsProvider = &metricsBlock{}
|
||
|
|
|
||
|
|
// metricsBlock represents a MetricsProvider that detects the size of the
|
||
|
|
// BlockMode Volume.
|
||
|
|
type metricsBlock struct {
|
||
|
|
// the device node where the volume is attached to.
|
||
|
|
device string
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewMetricsStatfs creates a new metricsBlock with the device node of the
|
||
|
|
// Volume.
|
||
|
|
func NewMetricsBlock(device string) MetricsProvider {
|
||
|
|
return &metricsBlock{device}
|
||
|
|
}
|
||
|
|
|
||
|
|
// See MetricsProvider.GetMetrics
|
||
|
|
// GetMetrics detects the size of the BlockMode volume for the device node
|
||
|
|
// where the Volume is attached.
|
||
|
|
//
|
||
|
|
// Note that only the capacity of the device can be detected with standard
|
||
|
|
// tools. Storage systems may have more information that they can provide by
|
||
|
|
// going through specialized APIs.
|
||
|
|
func (mb *metricsBlock) GetMetrics() (*Metrics, error) {
|
||
|
|
// TODO: Windows does not yet support VolumeMode=Block
|
||
|
|
if runtime.GOOS == "windows" {
|
||
|
|
return nil, NewNotImplementedError("Windows does not support Block volumes")
|
||
|
|
}
|
||
|
|
|
||
|
|
metrics := &Metrics{Time: metav1.Now()}
|
||
|
|
if mb.device == "" {
|
||
|
|
return metrics, NewNoPathDefinedError()
|
||
|
|
}
|
||
|
|
|
||
|
|
err := mb.getBlockInfo(metrics)
|
||
|
|
if err != nil {
|
||
|
|
return metrics, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return metrics, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// getBlockInfo fetches metrics.Capacity by opening the device and seeking to
|
||
|
|
// the end.
|
||
|
|
func (mb *metricsBlock) getBlockInfo(metrics *Metrics) error {
|
||
|
|
dev, err := os.Open(mb.device)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("unable to open device %q: %w", mb.device, err)
|
||
|
|
}
|
||
|
|
defer dev.Close()
|
||
|
|
|
||
|
|
end, err := dev.Seek(0, io.SeekEnd)
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("failed to detect size of %q: %w", mb.device, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
metrics.Capacity = resource.NewQuantity(end, resource.BinarySI)
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|