amap_copy
void amap_copy /* clear amap needs-copy flag */
amap_copy(ufi->map, ufi->entry, AMAP_COPY_NOWAIT,
amap_copy(srcmap, entry,
amap_copy(map, entry, 0, start, end);
amap_copy(map, entry, 0, entry->start,
amap_copy(old_map, old_entry, AMAP_COPY_NOCHUNK,
amap_copy(new_map, new_entry,
amap_copy(map, entry, 0, start, end);