mirror of
https://github.com/kubernetes/kubernetes.git
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113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package devicemapper
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import (
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"fmt"
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"os/exec"
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"strconv"
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"strings"
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dm "github.com/google/cadvisor/devicemapper"
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)
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// GetDMStats returns devicemapper thin provisioning stats.
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func GetDMStats(poolName string, dataBlkSize uint) (uint64, uint64, uint64, error) {
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out, err := exec.Command("dmsetup", "status", poolName).Output()
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if err != nil {
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return 0, 0, 0, err
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}
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used, total, err := parseDMStatus(string(out))
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if err != nil {
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return 0, 0, 0, err
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}
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used *= 512 * uint64(dataBlkSize)
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total *= 512 * uint64(dataBlkSize)
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free := total - used
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return total, free, free, nil
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}
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// parseDMStatus parses the output of `dmsetup status`.
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func parseDMStatus(dmStatus string) (uint64, uint64, error) {
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dmStatus = strings.Replace(dmStatus, "/", " ", -1)
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dmFields := strings.Fields(dmStatus)
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if len(dmFields) < 8 {
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return 0, 0, fmt.Errorf("invalid dmsetup status output: %s", dmStatus)
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}
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used, err := strconv.ParseUint(dmFields[6], 10, 64)
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if err != nil {
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return 0, 0, err
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}
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total, err := strconv.ParseUint(dmFields[7], 10, 64)
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if err != nil {
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return 0, 0, err
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}
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return used, total, nil
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}
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// parseDMTable parses a single line of `dmsetup table` output and returns the
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// major device, minor device, block size, and an error.
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func ParseDMTable(dmTable string) (uint, uint, uint, error) {
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dmTable = strings.Replace(dmTable, ":", " ", -1)
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dmFields := strings.Fields(dmTable)
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if len(dmFields) < 8 {
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return 0, 0, 0, fmt.Errorf("invalid dmsetup status output: %s", dmTable)
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}
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major, err := strconv.ParseUint(dmFields[5], 10, 32)
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if err != nil {
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return 0, 0, 0, err
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}
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minor, err := strconv.ParseUint(dmFields[6], 10, 32)
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if err != nil {
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return 0, 0, 0, err
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}
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dataBlkSize, err := strconv.ParseUint(dmFields[7], 10, 32)
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if err != nil {
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return 0, 0, 0, err
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}
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return uint(major), uint(minor), uint(dataBlkSize), nil
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}
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// DockerDMDevice returns information about the devicemapper device and "partition" if
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// docker is using devicemapper for its storage driver.
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func DockerDMDevice(driverStatus map[string]string, dmsetup dm.DmsetupClient) (string, uint, uint, uint, error) {
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const driverStatusPoolName = "Pool Name"
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poolName, ok := driverStatus[driverStatusPoolName]
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if !ok || len(poolName) == 0 {
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return "", 0, 0, 0, fmt.Errorf("could not get dm pool name")
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}
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out, err := dmsetup.Table(poolName)
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if err != nil {
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return "", 0, 0, 0, err
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}
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major, minor, dataBlkSize, err := ParseDMTable(string(out))
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if err != nil {
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return "", 0, 0, 0, err
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}
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return poolName, major, minor, dataBlkSize, nil
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}
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