Archipelago » qemu

                                            int64_t sector_num,

                                            int nb_sectors, int *pnum)

{

    off_t start, data, hole;

    int ret;

    }

    start = sector_num * BDRV_SECTOR_SIZE;

#ifdef CONFIG_FIEMAP

    struct {

        struct fiemap fm;

        struct fiemap_extent fe;

    } f;

    f.fm.fm_start = start;

    f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;

    f.fm.fm_flags = 0;

        data = f.fe.fe_logical;

        hole = f.fe.fe_logical + f.fe.fe_length;

    }

#elif defined SEEK_HOLE && defined SEEK_DATA

    hole = lseek(s->fd, start, SEEK_HOLE);

    if (hole == -1) {

        /* -ENXIO indicates that sector_num was past the end of the file.