notify automatically.

negative lookups.

Mkdir a)

Add disabled test for renaming directories.

problems.

This prevents "Failed to clone namespace" problem on some platforms.

syscall.Umount() does not update /etc/mtab.

Drop sleep statements for unmount tests.

This can be used to advise the kernel of updated attributes or data of
existing data; it cannot be used to remove negative entries.

Don't run TestAccess for root.