kubernetes/pkg/volume/util/fs/fs.go

type UsageInfo …

// Info linux returns (available bytes, byte capacity, byte usage, total inodes, inodes free, inode usage, error)
// for the filesystem that path resides upon.
func Info(path string) (int64, int64, int64, int64, int64, int64, error) { … }

// DiskUsage calculates the number of inodes and disk usage for a given directory
func DiskUsage(path string) (UsageInfo, error) { … }