+ unsigned long snap_id = 0;
+ char snap_tag[SD_MAX_VDI_TAG_LEN];
+ Error *local_err = NULL;
+ int fd, ret;
+ char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN];
+ BDRVSheepdogState *s = bs->opaque;
+ unsigned int wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN, rlen = 0;
+ uint32_t vid;
+ SheepdogVdiReq hdr = {
+ .opcode = SD_OP_DEL_VDI,
+ .data_length = wlen,
+ .flags = SD_FLAG_CMD_WRITE,
+ };
+ SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
+
+ if (!remove_objects(s)) {
+ return -1;
+ }
+
+ memset(buf, 0, sizeof(buf));
+ memset(snap_tag, 0, sizeof(snap_tag));
+ pstrcpy(buf, SD_MAX_VDI_LEN, s->name);
+ ret = qemu_strtoul(snapshot_id, NULL, 10, &snap_id);
+ if (ret || snap_id > UINT32_MAX) {
+ error_setg(errp, "Invalid snapshot ID: %s",
+ snapshot_id ? snapshot_id : "<null>");
+ return -EINVAL;
+ }
+
+ if (snap_id) {
+ hdr.snapid = (uint32_t) snap_id;
+ } else {
+ pstrcpy(snap_tag, sizeof(snap_tag), snapshot_id);
+ pstrcpy(buf + SD_MAX_VDI_LEN, SD_MAX_VDI_TAG_LEN, snap_tag);
+ }
+
+ ret = find_vdi_name(s, s->name, snap_id, snap_tag, &vid, true,
+ &local_err);
+ if (ret) {
+ return ret;
+ }
+
+ fd = connect_to_sdog(s, &local_err);
+ if (fd < 0) {
+ error_report_err(local_err);
+ return -1;
+ }
+
+ ret = do_req(fd, s->aio_context, (SheepdogReq *)&hdr,
+ buf, &wlen, &rlen);
+ closesocket(fd);
+ if (ret) {
+ return ret;
+ }
+
+ switch (rsp->result) {
+ case SD_RES_NO_VDI:
+ error_report("%s was already deleted", s->name);
+ case SD_RES_SUCCESS:
+ break;
+ default:
+ error_report("%s, %s", sd_strerror(rsp->result), s->name);
+ return -1;
+ }
+
+ return ret;