fix performance degradation of NFS

Signed-off-by: fusida <[email protected]>

fs/fs.go

@@ -386,6 +386,7 @@ func (i *RealFsInfo) GetFsInfoForPath(mountSet map[string]struct{}) ([]Fs, error
 	if err != nil {
 		return nil, err
 	}
+	nfsInfo := make(map[string]Fs, 0)
 	for device, partition := range i.partitions {
 		_, hasMount := mountSet[partition.mountpoint]
 		_, hasDevice := deviceSet[device]
@@ -410,10 +411,21 @@ func (i *RealFsInfo) GetFsInfoForPath(mountSet map[string]struct{}) ([]Fs, error
 			default:
 				var inodes, inodesFree uint64
 				if utils.FileExists(partition.mountpoint) {
+					if strings.HasPrefix(partition.fsType, "nfs") {
+						devId := fmt.Sprintf("%d:%d", partition.major, partition.minor)
+						if v, ok := nfsInfo[devId]; ok {
+							fs = v
+							break
+						}
+					}
 					fs.Capacity, fs.Free, fs.Available, inodes, inodesFree, err = getVfsStats(partition.mountpoint)
 					fs.Inodes = &inodes
 					fs.InodesFree = &inodesFree
 					fs.Type = VFS
+					if strings.HasPrefix(partition.fsType, "nfs") {
+						devId := fmt.Sprintf("%d:%d", partition.major, partition.minor)
+						nfsInfo[devId] = fs
+					}
 				} else {
 					klog.V(4).Infof("unable to determine file system type, partition mountpoint does not exist: %v", partition.mountpoint)
 				}