SDF_FORCE_AIL_FLUSH
set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
if (test_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags) ||
clear_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
test_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags) ||
test_bit(SDF_FORCE_AIL_FLUSH, &f),