UBLK_IO_FLAG_ACTIVE
io->flags &= ~UBLK_IO_FLAG_ACTIVE;
io->flags |= UBLK_IO_FLAG_ACTIVE;
io->flags & UBLK_IO_FLAG_ACTIVE);
if (!(io->flags & UBLK_IO_FLAG_ACTIVE))
io->flags |= UBLK_IO_FLAG_ACTIVE;
if (io->flags & UBLK_IO_FLAG_ACTIVE)