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- // +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/utils/mount"
- v1 "k8s.io/api/core/v1"
- )
- // 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
- }
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