Replace remaining MI uses of random(9)

[Joerg Sonnenberger]

Hi all,
please review the attached patch to remove the two remaining MI uses of
random(9). Neither should be in a performance critical code path and
both may actually benefit from the better distribution. The vfs_bio.c
change is a bit more involved as I am trying to replace a 32bit division
with a long multiplication, which should be cheaper pretty much
anywhere.

Joerg

[David Holland]

Post by Joerg Sonnenberger
Hi all,
please review the attached patch to remove the two remaining MI uses of
random(9). Neither should be in a performance critical code path and
both may actually benefit from the better distribution. The vfs_bio.c
change is a bit more involved as I am trying to replace a 32bit division
with a long multiplication, which should be cheaper pretty much
anywhere.

When doing that sort of thing, please expand the explanatory comments,
not shrink them...