SDF_NORECOVERY
BUG_ON(!test_bit(SDF_NORECOVERY, &sdp->sd_flags) &&
set_bit(SDF_NORECOVERY, &sdp->sd_flags);
test_bit(SDF_NORECOVERY, &f),
if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {