kubernetes/test/e2e_node/util_xfs_linux.go

func detectMountpoint(m mount.Interface, path string) string { … }

const xfsMagic …

// XFS over-allocates and then eventually removes that excess allocation.
// That can lead to a file growing beyond its eventual size, causing
// an unnecessary eviction:
//
// % ls -ls
// total 32704
// 32704 -rw-r--r-- 1 rkrawitz rkrawitz 20971520 Jan 15 13:16 foo.bin
//
// This issue can be hit regardless of the means used to count storage.
// It is not present in ext4fs.
func isXfs(dir string) bool { … }