K 10
svn:author
V 5
luigi
K 8
svn:date
V 27
2009-03-08T00:11:26.494854Z
K 7
svn:log
V 483
MFC rev.188571

Clarify and reimplement the bioq API so that bioq_disksort() has
the correct behaviour (sorting by distance from the current head position
in the scan direction) and bioq_insert_head() and bioq_insert_tail()
have a well defined (and useful) behaviour, especially when intermixed
with calls to bioq_disksort().

See the original commit log for more details.

NO API/ABI changes (except from fixing bugs and defining
unspecified behaviour that no code should rely on).

END