[Bug 273094] getfsstat can return unexpectedly stale statfs data.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273094

--- Comment #1 from Peter Jeremy <peterj@FreeBSD.org> ---
Actually, having more carefully read the sources, statfs(2) doesn't update the
cached values, only calling getfsstat(2) with MNT_WAIT works.  I think that's
even more of a POLA violation because it means that data returned by
getfstatfs() can be older than data returned by statfs().

IMO, the logic in kern/vfs_mount.c:__vfs_statfs() should be inverted so that it
always calls mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat) and then copies the
result to sbp if required, though I'm not sure of the subtleties that may be
involved.

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