dlm_proxy_ast
struct dlm_proxy_ast *past = (struct dlm_proxy_ast *) msg->buf;
struct dlm_proxy_ast past;
memset(&past, 0, sizeof(struct dlm_proxy_ast));
vec[0].iov_len = sizeof(struct dlm_proxy_ast);
#define DLM_PROXY_AST_MAX_LEN (sizeof(struct dlm_proxy_ast)+DLM_LVB_LEN)