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Check subpath file

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This commit is contained in:
Hemant Kumar 2021-11-09 13:29:58 -05:00
parent 06e040de40
commit 7a73168a59
1 changed files with 21 additions and 12 deletions
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33
pkg/volume/util/subpath/subpath_linux.go
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@ -30,7 +30,6 @@ import (
"golang.org/x/sys/unix"
"k8s.io/klog/v2"
"k8s.io/kubernetes/pkg/volume/util/hostutil"
"k8s.io/mount-utils"
)
@ -110,19 +109,12 @@ func prepareSubpathTarget(mounter mount.Interface, subpath Subpath) (bool, strin
notMount = true
}
if !notMount {
linuxHostUtil := hostutil.NewHostUtil()
mntInfo, err := linuxHostUtil.FindMountInfo(bindPathTarget)
// It's already mounted, so check if it's bind-mounted to the same path
samePath, err := checkSubPathFileEqual(subpath, bindPathTarget)
if err != nil {
return false, "", fmt.Errorf("error calling findMountInfo for %s: %s", bindPathTarget, err)
return false, "", fmt.Errorf("error checking subpath mount info for %s: %s", bindPathTarget, err)
}
if mntInfo.Root != subpath.Path {
volumeMountInfo, err := linuxHostUtil.FindExactMountInfo(subpath.VolumePath)
if err == nil && mount.PathWithinBase(subpath.Path, subpath.VolumePath) &&
(volumeMountInfo.Major == mntInfo.Major && volumeMountInfo.Minor == mntInfo.Minor) {
klog.V(5).Infof("Skipping bind-mounting subpath %s, volumePath: %s, path: %s", bindPathTarget, subpath.VolumePath, subpath.Path)
return true, bindPathTarget, nil
}
if !samePath {
// It's already mounted but not what we want, unmount it
if err = mounter.Unmount(bindPathTarget); err != nil {
return false, "", fmt.Errorf("error ummounting %s: %s", bindPathTarget, err)
@ -163,6 +155,23 @@ func prepareSubpathTarget(mounter mount.Interface, subpath Subpath) (bool, strin
return false, bindPathTarget, nil
}
func checkSubPathFileEqual(subpath Subpath, bindMountTarget string) (bool, error) {
s, err := os.Stat(subpath.Path)
if err != nil {
return false, fmt.Errorf("stat %s failed: %s", subpath.Path, err)
}
t, err := os.Lstat(bindMountTarget)
if err != nil {
return false, fmt.Errorf("lstat %s failed: %s", bindMountTarget, err)
}
if !os.SameFile(s, t) {
return false, nil
}
return true, nil
}
func getSubpathBindTarget(subpath Subpath) string {
// containerName is DNS label, i.e. safe as a directory name.
return filepath.Join(subpath.PodDir, containerSubPathDirectoryName, subpath.VolumeName, subpath.ContainerName, strconv.Itoa(subpath.VolumeMountIndex))