static int qcow_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) { BDRVQcowState *s = bs->opaque; QCowSnapshot *snapshots1, sn1, *sn = &sn1; int i, ret; uint64_t *l1_table = NULL; memset(sn, 0, sizeof(*sn)); if (sn_info->id_str[0] == '\0') { /* compute a new id */ find_new_snapshot_id(bs, sn_info->id_str, sizeof(sn_info->id_str)); } /* check that the ID is unique */ if (find_snapshot_by_id(bs, sn_info->id_str) >= 0) return -ENOENT; sn->id_str = qemu_strdup(sn_info->id_str); if (!sn->id_str) goto fail; sn->name = qemu_strdup(sn_info->name); if (!sn->name) goto fail; sn->vm_state_size = sn_info->vm_state_size; sn->date_sec = sn_info->date_sec; sn->date_nsec = sn_info->date_nsec; sn->vm_clock_nsec = sn_info->vm_clock_nsec; ret = update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 1); if (ret < 0) goto fail; /* create the L1 table of the snapshot */ sn->l1_table_offset = alloc_clusters(bs, s->l1_size * sizeof(uint64_t)); sn->l1_size = s->l1_size; l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t)); if (!l1_table) goto fail; for(i = 0; i < s->l1_size; i++) { l1_table[i] = cpu_to_be64(s->l1_table[i]); } if (bdrv_pwrite(s->hd, sn->l1_table_offset, l1_table, s->l1_size * sizeof(uint64_t)) != (s->l1_size * sizeof(uint64_t))) goto fail; qemu_free(l1_table); l1_table = NULL; snapshots1 = qemu_malloc((s->nb_snapshots + 1) * sizeof(QCowSnapshot)); if (!snapshots1) goto fail; memcpy(snapshots1, s->snapshots, s->nb_snapshots * sizeof(QCowSnapshot)); s->snapshots = snapshots1; s->snapshots[s->nb_snapshots++] = *sn; if (qcow_write_snapshots(bs) < 0) goto fail; #ifdef DEBUG_ALLOC check_refcounts(bs); #endif return 0; fail: qemu_free(sn->name); qemu_free(l1_table); return -1; }