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.

For 32 bit platforms, we don't want to generate 64 bit inode numbers,
as that will cause EOVERFLOW when running stat() and friends.