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75 lines
1.7 KiB
Go
75 lines
1.7 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 e2enode
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import (
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"path/filepath"
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"syscall"
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"k8s.io/utils/mount"
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)
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func detectMountpoint(m mount.Interface, path string) string {
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path, err := filepath.Abs(path)
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if err == nil {
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path, err = filepath.EvalSymlinks(path)
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}
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if err != nil {
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return ""
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}
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for path != "" && path != "/" {
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isNotMount, err := m.IsLikelyNotMountPoint(path)
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if err != nil {
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return ""
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}
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if !isNotMount {
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return path
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}
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path = filepath.Dir(path)
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}
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return "/"
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}
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const (
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xfsMagic = 0x58465342
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)
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// XFS over-allocates and then eventually removes that excess allocation.
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// That can lead to a file growing beyond its eventual size, causing
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// an unnecessary eviction:
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//
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// % ls -ls
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// total 32704
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// 32704 -rw-r--r-- 1 rkrawitz rkrawitz 20971520 Jan 15 13:16 foo.bin
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//
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// This issue can be hit regardless of the means used to count storage.
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// It is not present in ext4fs.
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func isXfs(dir string) bool {
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mountpoint := detectMountpoint(mount.New(""), dir)
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if mountpoint == "" {
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return false
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}
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var buf syscall.Statfs_t
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err := syscall.Statfs(mountpoint, &buf)
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if err != nil {
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return false
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}
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return buf.Type == xfsMagic
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}
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