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fc_util.go
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fc_util.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 fc
import (
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"strings"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/volume"
)
type ioHandler interface {
ReadDir(dirname string) ([]os.FileInfo, error)
Lstat(name string) (os.FileInfo, error)
EvalSymlinks(path string) (string, error)
WriteFile(filename string, data []byte, perm os.FileMode) error
}
type osIOHandler struct{}
func (handler *osIOHandler) ReadDir(dirname string) ([]os.FileInfo, error) {
return ioutil.ReadDir(dirname)
}
func (handler *osIOHandler) Lstat(name string) (os.FileInfo, error) {
return os.Lstat(name)
}
func (handler *osIOHandler) EvalSymlinks(path string) (string, error) {
return filepath.EvalSymlinks(path)
}
func (handler *osIOHandler) WriteFile(filename string, data []byte, perm os.FileMode) error {
return ioutil.WriteFile(filename, data, perm)
}
// given a disk path like /dev/sdx, find the devicemapper parent
// TODO #23192 Convert this code to use the generic code in ../util
// which is used by the iSCSI implementation
func findMultipathDeviceMapper(disk string, io ioHandler) string {
sys_path := "/sys/block/"
if dirs, err := io.ReadDir(sys_path); err == nil {
for _, f := range dirs {
name := f.Name()
if strings.HasPrefix(name, "dm-") {
if _, err1 := io.Lstat(sys_path + name + "/slaves/" + disk); err1 == nil {
return "/dev/" + name
}
}
}
}
return ""
}
// given a wwn and lun, find the device and associated devicemapper parent
func findDisk(wwn, lun string, io ioHandler) (string, string) {
fc_path := "-fc-0x" + wwn + "-lun-" + lun
dev_path := "/dev/disk/by-path/"
if dirs, err := io.ReadDir(dev_path); err == nil {
for _, f := range dirs {
name := f.Name()
if strings.Contains(name, fc_path) {
if disk, err1 := io.EvalSymlinks(dev_path + name); err1 == nil {
arr := strings.Split(disk, "/")
l := len(arr) - 1
dev := arr[l]
dm := findMultipathDeviceMapper(dev, io)
return disk, dm
}
}
}
}
return "", ""
}
func createMultipathConf(path string, io ioHandler) {
if _, err := os.Lstat(path); err != nil {
data := []byte(`defaults {
find_multipaths yes
user_friendly_names yes
}
blacklist {
}
`)
io.WriteFile(path, data, 0664)
}
}
// rescan scsi bus
func scsiHostRescan(io ioHandler) {
scsi_path := "/sys/class/scsi_host/"
if dirs, err := io.ReadDir(scsi_path); err == nil {
for _, f := range dirs {
name := scsi_path + f.Name() + "/scan"
data := []byte("- - -")
io.WriteFile(name, data, 0666)
}
}
}
// make a directory like /var/lib/kubelet/plugins/kubernetes.io/pod/fc/target-lun-0
func makePDNameInternal(host volume.VolumeHost, wwns []string, lun string) string {
return path.Join(host.GetPluginDir(fcPluginName), wwns[0]+"-lun-"+lun)
}
type FCUtil struct{}
func (util *FCUtil) MakeGlobalPDName(fc fcDisk) string {
return makePDNameInternal(fc.plugin.host, fc.wwns, fc.lun)
}
func searchDisk(wwns []string, lun string, io ioHandler) (string, string) {
disk := ""
dm := ""
rescaned := false
// two-phase search:
// first phase, search existing device path, if a multipath dm is found, exit loop
// otherwise, in second phase, rescan scsi bus and search again, return with any findings
for true {
for _, wwn := range wwns {
disk, dm = findDisk(wwn, lun, io)
// if multipath device is found, break
if dm != "" {
break
}
}
// if a dm is found, exit loop
if rescaned || dm != "" {
break
}
// rescan and search again
// create multipath conf if it is not there
createMultipathConf("/etc/multipath.conf", io)
// rescan scsi bus
scsiHostRescan(io)
rescaned = true
}
return disk, dm
}
func (util *FCUtil) AttachDisk(b fcDiskMounter) error {
devicePath := ""
wwns := b.wwns
lun := b.lun
io := b.io
disk, dm := searchDisk(wwns, lun, io)
// if no disk matches input wwn and lun, exit
if disk == "" && dm == "" {
return fmt.Errorf("no fc disk found")
}
// if multipath devicemapper device is found, use it; otherwise use raw disk
if dm != "" {
devicePath = dm
} else {
devicePath = disk
}
// mount it
globalPDPath := b.manager.MakeGlobalPDName(*b.fcDisk)
noMnt, err := b.mounter.IsLikelyNotMountPoint(globalPDPath)
if !noMnt {
glog.Infof("fc: %s already mounted", globalPDPath)
return nil
}
if err := os.MkdirAll(globalPDPath, 0750); err != nil {
return fmt.Errorf("fc: failed to mkdir %s, error", globalPDPath)
}
err = b.mounter.FormatAndMount(devicePath, globalPDPath, b.fsType, nil)
if err != nil {
return fmt.Errorf("fc: failed to mount fc volume %s [%s] to %s, error %v", devicePath, b.fsType, globalPDPath, err)
}
return err
}
func (util *FCUtil) DetachDisk(c fcDiskUnmounter, mntPath string) error {
if err := c.mounter.Unmount(mntPath); err != nil {
return fmt.Errorf("fc detach disk: failed to unmount: %s\nError: %v", mntPath, err)
}
return nil
}