MAP_ENTRY_NOSYNC
if (vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC) ||
if ((fs->entry->eflags & MAP_ENTRY_NOSYNC) != 0)
protoeflags |= MAP_ENTRY_NOSYNC;
entry->eflags |= MAP_ENTRY_NOSYNC;
entry->eflags &= ~MAP_ENTRY_NOSYNC;