Archipelago » qemu

 * the l2 table offset in the qcow2 file and the cluster index

 * in the l2 table are given to the caller.

 *

 */

static int get_cluster_table(BlockDriverState *bs, uint64_t offset,

                             uint64_t **new_l2_table,

                             uint64_t *new_l2_offset,

    l1_index = offset >> (s->l2_bits + s->cluster_bits);

    if (l1_index >= s->l1_size) {

        ret = qcow2_grow_l1_table(bs, l1_index + 1);

    }

    l2_offset = s->l1_table[l1_index];

        /* load the l2 table in memory */

        l2_offset &= ~QCOW_OFLAG_COPIED;

        l2_table = l2_load(bs, l2_offset);

    } else {

        if (l2_offset)

            qcow2_free_clusters(bs, l2_offset, s->l2_size * sizeof(uint64_t));

        l2_table = l2_allocate(bs, l1_index);

        l2_offset = s->l1_table[l1_index] & ~QCOW_OFLAG_COPIED;

    }

    *new_l2_offset = l2_offset;

    *new_l2_index = l2_index;

}

/*

    int nb_csectors;

    ret = get_cluster_table(bs, offset, &l2_table, &l2_offset, &l2_index);

        return 0;

    cluster_offset = be64_to_cpu(l2_table[l2_index]);

    if (cluster_offset & QCOW_OFLAG_COPIED)

            goto err;

    }

    /* update L2 table */

        goto err;

    for (i = 0; i < m->nb_clusters; i++) {

        /* if two concurrent writes happen to the same unallocated cluster

    QCowL2Meta *old_alloc;

    ret = get_cluster_table(bs, offset, &l2_table, &l2_offset, &l2_index);

        return 0;

    nb_clusters = size_to_clusters(s, n_end << 9);