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54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
// +build linux
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/*
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Copyright 2015 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 empty_dir
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import (
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"fmt"
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"syscall"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/util/mount"
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)
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// Defined by Linux - the type number for tmpfs mounts.
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const linuxTmpfsMagic = 0x01021994
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// realMountDetector implements mountDetector in terms of syscalls.
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type realMountDetector struct {
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mounter mount.Interface
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}
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func (m *realMountDetector) GetMountMedium(path string) (storageMedium, bool, error) {
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glog.V(5).Infof("Determining mount medium of %v", path)
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notMnt, err := m.mounter.IsLikelyNotMountPoint(path)
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if err != nil {
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return 0, false, fmt.Errorf("IsLikelyNotMountPoint(%q): %v", path, err)
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}
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buf := syscall.Statfs_t{}
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if err := syscall.Statfs(path, &buf); err != nil {
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return 0, false, fmt.Errorf("statfs(%q): %v", path, err)
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}
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glog.V(5).Infof("Statfs_t of %v: %+v", path, buf)
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if buf.Type == linuxTmpfsMagic {
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return mediumMemory, !notMnt, nil
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}
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return mediumUnknown, !notMnt, nil
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}
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