128                              int64_t sector_num, int nb_sectors,  in is_changed()  argument
133     if (!bitmap || nb_sectors == 0) {  in is_changed()
134 	*num_same = nb_sectors;  in is_changed()
139     for (*num_same = 1; *num_same < nb_sectors; (*num_same)++) {  in is_changed()
148                             int nb_sectors, int *pnum)  in cow_is_allocated()  argument
151     return is_changed(s->cow_bitmap, sector_num, nb_sectors, pnum);  in cow_is_allocated()
155                     uint8_t *buf, int nb_sectors)  in cow_read()  argument
160     while (nb_sectors > 0) {  in cow_read()
161         if (is_changed(s->cow_bitmap, sector_num, nb_sectors, &n)) {  in cow_read()
176         nb_sectors -= n;  in cow_read()
184                      const uint8_t *buf, int nb_sectors)  in cow_write()  argument
190     ret = write(s->fd, buf, nb_sectors * 512);  in cow_write()
191     if (ret != nb_sectors * 512)  in cow_write()
193     for (i = 0; i < nb_sectors; i++)  in cow_write()