static int sd_create(const char *filename, QEMUOptionParameter *options, Error **errp) { int ret = 0; uint32_t vid = 0; char *backing_file = NULL; BDRVSheepdogState *s; char tag[SD_MAX_VDI_TAG_LEN]; uint32_t snapid; bool prealloc = false; Error *local_err = NULL; s = g_malloc0(sizeof(BDRVSheepdogState)); memset(tag, 0, sizeof(tag)); if (strstr(filename, "://")) { ret = sd_parse_uri(s, filename, s->name, &snapid, tag); } else { ret = parse_vdiname(s, filename, s->name, &snapid, tag); } if (ret < 0) { goto out; } while (options && options->name) { if (!strcmp(options->name, BLOCK_OPT_SIZE)) { s->inode.vdi_size = options->value.n; } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { backing_file = options->value.s; } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { if (!options->value.s || !strcmp(options->value.s, "off")) { prealloc = false; } else if (!strcmp(options->value.s, "full")) { prealloc = true; } else { error_report("Invalid preallocation mode: '%s'", options->value.s); ret = -EINVAL; goto out; } } else if (!strcmp(options->name, BLOCK_OPT_REDUNDANCY)) { ret = parse_redundancy(s, options->value.s); if (ret < 0) { goto out; } } options++; } if (s->inode.vdi_size > SD_MAX_VDI_SIZE) { error_report("too big image size"); ret = -EINVAL; goto out; } if (backing_file) { BlockDriverState *bs; BDRVSheepdogState *s; BlockDriver *drv; /* Currently, only Sheepdog backing image is supported. */ drv = bdrv_find_protocol(backing_file, true); if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) { error_report("backing_file must be a sheepdog image"); ret = -EINVAL; goto out; } ret = bdrv_file_open(&bs, backing_file, NULL, 0, &local_err); if (ret < 0) { qerror_report_err(local_err); error_free(local_err); goto out; } s = bs->opaque; if (!is_snapshot(&s->inode)) { error_report("cannot clone from a non snapshot vdi"); bdrv_unref(bs); ret = -EINVAL; goto out; } bdrv_unref(bs); } ret = do_sd_create(s, &vid, 0); if (!prealloc || ret) { goto out; } ret = sd_prealloc(filename); out: g_free(s); return ret; }