B_IOSTARTED
bp->b_flags &= ~B_IOSTARTED;
KASSERT((bp->b_flags & B_IOSTARTED) == 0,
bp->b_flags &= ~B_IOSTARTED;
KASSERT((bp->b_flags & B_IOSTARTED) == 0,
KASSERT((bp->b_flags & B_IOSTARTED) == 0,
bp->b_flags |= B_IOSTARTED;
if ((bp->b_flags & B_IOSTARTED) != 0) {
bp->b_flags &= ~B_IOSTARTED;
bp->b_flags &= ~(B_CACHE | B_IOSTARTED);