| // +build linux |
| |
| /* |
| Copyright 2015 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 emptydir |
| |
| import ( |
| "fmt" |
| |
| "golang.org/x/sys/unix" |
| "k8s.io/klog" |
| |
| "k8s.io/api/core/v1" |
| "k8s.io/kubernetes/pkg/util/mount" |
| ) |
| |
| // Defined by Linux - the type number for tmpfs mounts. |
| const ( |
| linuxTmpfsMagic = 0x01021994 |
| linuxHugetlbfsMagic = 0x958458f6 |
| ) |
| |
| // realMountDetector implements mountDetector in terms of syscalls. |
| type realMountDetector struct { |
| mounter mount.Interface |
| } |
| |
| func (m *realMountDetector) GetMountMedium(path string) (v1.StorageMedium, bool, error) { |
| klog.V(5).Infof("Determining mount medium of %v", path) |
| notMnt, err := m.mounter.IsLikelyNotMountPoint(path) |
| if err != nil { |
| return v1.StorageMediumDefault, false, fmt.Errorf("IsLikelyNotMountPoint(%q): %v", path, err) |
| } |
| buf := unix.Statfs_t{} |
| if err := unix.Statfs(path, &buf); err != nil { |
| return v1.StorageMediumDefault, false, fmt.Errorf("statfs(%q): %v", path, err) |
| } |
| |
| klog.V(5).Infof("Statfs_t of %v: %+v", path, buf) |
| if buf.Type == linuxTmpfsMagic { |
| return v1.StorageMediumMemory, !notMnt, nil |
| } else if int64(buf.Type) == linuxHugetlbfsMagic { |
| return v1.StorageMediumHugePages, !notMnt, nil |
| } |
| return v1.StorageMediumDefault, !notMnt, nil |
| } |