Re: Reason why "nocache" option is not displayed in "mount"?

The issue has to do with how flags are defined in mount.h.
Specifically there are the flags that are externally visible
(prefixed with MNT_) and those that are for internal use
(prefixed with MNTK_, the K standing for KERNEL). If it
is desirable to have MNTK_NULL_NOCACHE visible, then it
should be renamed to MNT_NULL_CACHE, added to MNT_VISFLAGMASK,
and listed in MNTOPT_NAMES. It probably belongs in the set
described as `Flags set by internal operations, but visible
to the user.' With this change, it will be displayed by
the mount command and show up in the statfs flags.

	Kirk McKusick