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62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
// +build linux
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/*
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Copyright 2016 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package util
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import (
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"errors"
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"strings"
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)
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// FindMultipathDeviceForDevice given a device name like /dev/sdx, find the devicemapper parent
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func (handler *deviceHandler) FindMultipathDeviceForDevice(device string) string {
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io := handler.get_io
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disk, err := findDeviceForPath(device, io)
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if err != nil {
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return ""
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}
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sysPath := "/sys/block/"
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if dirs, err := io.ReadDir(sysPath); err == nil {
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for _, f := range dirs {
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name := f.Name()
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if strings.HasPrefix(name, "dm-") {
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if _, err1 := io.Lstat(sysPath + name + "/slaves/" + disk); err1 == nil {
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return "/dev/" + name
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}
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}
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}
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}
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return ""
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}
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// findDeviceForPath Find the underlaying disk for a linked path such as /dev/disk/by-path/XXXX or /dev/mapper/XXXX
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// will return sdX or hdX etc, if /dev/sdX is passed in then sdX will be returned
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func findDeviceForPath(path string, io IoUtil) (string, error) {
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devicePath, err := io.EvalSymlinks(path)
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if err != nil {
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return "", err
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}
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// if path /dev/hdX split into "", "dev", "hdX" then we will
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// return just the last part
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parts := strings.Split(devicePath, "/")
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if len(parts) == 3 && strings.HasPrefix(parts[1], "dev") {
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return parts[2], nil
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}
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return "", errors.New("Illegal path for device " + devicePath)
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}
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