static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, int64_t sector_num, int remaining_sectors, QEMUIOVector *qiov) { BDRVQcowState *s = bs->opaque; int index_in_cluster; int n_end; int ret; int cur_nr_sectors; /* number of sectors in current iteration */ uint64_t cluster_offset; QEMUIOVector hd_qiov; uint64_t bytes_done = 0; uint8_t *cluster_data = NULL; QCowL2Meta *l2meta; trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, remaining_sectors); qemu_iovec_init(&hd_qiov, qiov->niov); s->cluster_cache_offset = -1; /* disable compressed cache */ qemu_co_mutex_lock(&s->lock); while (remaining_sectors != 0) { l2meta = NULL; trace_qcow2_writev_start_part(qemu_coroutine_self()); index_in_cluster = sector_num & (s->cluster_sectors - 1); n_end = index_in_cluster + remaining_sectors; if (s->crypt_method && n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; } ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, index_in_cluster, n_end, &cur_nr_sectors, &cluster_offset, &l2meta); if (ret < 0) { goto fail; } if (l2meta->nb_clusters > 0 && (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)) { qcow2_mark_dirty(bs); } assert((cluster_offset & 511) == 0); qemu_iovec_reset(&hd_qiov); qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_nr_sectors * 512); if (s->crypt_method) { if (!cluster_data) { cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); } assert(hd_qiov.size <= QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size); qcow2_encrypt_sectors(s, sector_num, cluster_data, cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); qemu_iovec_reset(&hd_qiov); qemu_iovec_add(&hd_qiov, cluster_data, cur_nr_sectors * 512); } qemu_co_mutex_unlock(&s->lock); BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); trace_qcow2_writev_data(qemu_coroutine_self(), (cluster_offset >> 9) + index_in_cluster); ret = bdrv_co_writev(bs->file, (cluster_offset >> 9) + index_in_cluster, cur_nr_sectors, &hd_qiov); qemu_co_mutex_lock(&s->lock); if (ret < 0) { goto fail; } if (l2meta != NULL) { ret = qcow2_alloc_cluster_link_l2(bs, l2meta); if (ret < 0) { goto fail; } run_dependent_requests(s, l2meta); g_free(l2meta); l2meta = NULL; } remaining_sectors -= cur_nr_sectors; sector_num += cur_nr_sectors; bytes_done += cur_nr_sectors * 512; trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); } ret = 0; fail: if (l2meta != NULL) { run_dependent_requests(s, l2meta); g_free(l2meta); } qemu_co_mutex_unlock(&s->lock); qemu_iovec_destroy(&hd_qiov); qemu_vfree(cluster_data); trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); return ret; }