FIX
idesc->id_fix = FIX;
idesc->id_fix = FIX;
case FIX:
FIX(init);
FIX(alloc);
FIX(dealloc);
FIX(getpages);
FIX(getpages_async);
FIX(putpages);
FIX(haspage);
FIX(populate);
FIX(pageunswapped);
FIX(update_writecount);
FIX(release_writecount);
FIX(set_writeable_dirty);
FIX(mightbedirty);
FIX(getvp);
FIX(freespace);
FIX(page_inserted);
FIX(page_removed);
FIX(can_alloc_page);