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fix 68211: modified subpath configmap mount fails when container restart

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fatedier 2020-03-29 16:21:41 +08:00
parent 1c11ff7a26
commit 6c2562a579
2 changed files with 21 additions and 3 deletions
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5
pkg/volume/util/hostutil/hostutil_linux.go
View File

@ -158,6 +158,11 @@ func (hu *HostUtil) EvalHostSymlinks(pathname string) (string, error) {
return filepath.EvalSymlinks(pathname)
}
// FindMountInfo returns the mount info on the given path.
func (hu *HostUtil) FindMountInfo(path string) (mount.MountInfo, error) {
return findMountInfo(path, procMountInfoPath)
}
// isShared returns true, if given path is on a mount point that has shared
// mount propagation.
func isShared(mount string, mountInfoPath string) (bool, error) {

19
pkg/volume/util/subpath/subpath_linux.go
View File

@ -29,6 +29,7 @@ import (
"golang.org/x/sys/unix"
"k8s.io/klog/v2"
"k8s.io/kubernetes/pkg/volume/util/hostutil"
"k8s.io/utils/mount"
)
@ -108,9 +109,21 @@ func prepareSubpathTarget(mounter mount.Interface, subpath Subpath) (bool, strin
notMount = true
}
if !notMount {
// It's already mounted
klog.V(5).Infof("Skipping bind-mounting subpath %s: already mounted", bindPathTarget)
return true, bindPathTarget, nil
linuxHostUtil := hostutil.NewHostUtil()
mntInfo, err := linuxHostUtil.FindMountInfo(bindPathTarget)
if err != nil {
return false, "", fmt.Errorf("error calling findMountInfo for %s: %s", bindPathTarget, err)
}
if mntInfo.Root != subpath.Path {
// 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)
}
} else {
// It's already mounted
klog.V(5).Infof("Skipping bind-mounting subpath %s: already mounted", bindPathTarget)
return true, bindPathTarget, nil
}
}
// bindPathTarget is in /var/lib/kubelet and thus reachable without any