static int bochs_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { BDRVBochsState *s = bs->opaque; uint32_t i; struct bochs_header bochs; int ret; bs->read_only = 1; // no write support yet ret = bdrv_pread(bs->file, 0, &bochs, sizeof(bochs)); if (ret < 0) { return ret; if (strcmp(bochs.magic, HEADER_MAGIC) || strcmp(bochs.type, REDOLOG_TYPE) || strcmp(bochs.subtype, GROWING_TYPE) || ((le32_to_cpu(bochs.version) != HEADER_VERSION) && (le32_to_cpu(bochs.version) != HEADER_V1))) { error_setg(errp, "Image not in Bochs format"); return -EINVAL; if (le32_to_cpu(bochs.version) == HEADER_V1) { bs->total_sectors = le64_to_cpu(bochs.extra.redolog_v1.disk) / 512; } else { bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512; s->catalog_size = le32_to_cpu(bochs.catalog); s->catalog_bitmap = g_malloc(s->catalog_size * 4); ret = bdrv_pread(bs->file, le32_to_cpu(bochs.header), s->catalog_bitmap, s->catalog_size * 4); if (ret < 0) { goto fail; for (i = 0; i < s->catalog_size; i++) le32_to_cpus(&s->catalog_bitmap[i]); s->data_offset = le32_to_cpu(bochs.header) + (s->catalog_size * 4); s->bitmap_blocks = 1 + (le32_to_cpu(bochs.bitmap) - 1) / 512; s->extent_blocks = 1 + (le32_to_cpu(bochs.extent) - 1) / 512; s->extent_size = le32_to_cpu(bochs.extent); if (s->catalog_size < bs->total_sectors / s->extent_size) { error_setg(errp, "Catalog size is too small for this disk size"); ret = -EINVAL; goto fail; qemu_co_mutex_init(&s->lock); return 0; fail: g_free(s->catalog_bitmap); return ret;