diff options
Diffstat (limited to 'vendor/k8s.io/kubernetes/pkg/volume/util/device_util_linux.go')
-rw-r--r-- | vendor/k8s.io/kubernetes/pkg/volume/util/device_util_linux.go | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/vendor/k8s.io/kubernetes/pkg/volume/util/device_util_linux.go b/vendor/k8s.io/kubernetes/pkg/volume/util/device_util_linux.go new file mode 100644 index 000000000..0d9851140 --- /dev/null +++ b/vendor/k8s.io/kubernetes/pkg/volume/util/device_util_linux.go @@ -0,0 +1,61 @@ +// +build linux + +/* +Copyright 2016 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 util + +import ( + "errors" + "strings" +) + +// FindMultipathDeviceForDevice given a device name like /dev/sdx, find the devicemapper parent +func (handler *deviceHandler) FindMultipathDeviceForDevice(device string) string { + io := handler.get_io + disk, err := findDeviceForPath(device, io) + if err != nil { + return "" + } + sysPath := "/sys/block/" + if dirs, err := io.ReadDir(sysPath); err == nil { + for _, f := range dirs { + name := f.Name() + if strings.HasPrefix(name, "dm-") { + if _, err1 := io.Lstat(sysPath + name + "/slaves/" + disk); err1 == nil { + return "/dev/" + name + } + } + } + } + return "" +} + +// findDeviceForPath Find the underlaying disk for a linked path such as /dev/disk/by-path/XXXX or /dev/mapper/XXXX +// will return sdX or hdX etc, if /dev/sdX is passed in then sdX will be returned +func findDeviceForPath(path string, io IoUtil) (string, error) { + devicePath, err := io.EvalSymlinks(path) + if err != nil { + return "", err + } + // if path /dev/hdX split into "", "dev", "hdX" then we will + // return just the last part + parts := strings.Split(devicePath, "/") + if len(parts) == 3 && strings.HasPrefix(parts[1], "dev") { + return parts[2], nil + } + return "", errors.New("Illegal path for device " + devicePath) +} |