coda_mkdir
.mkdir = coda_mkdir,
inp->coda_mkdir.VFid = *dirfid;
inp->coda_mkdir.attr = *attrs;
inp->coda_mkdir.name = offset;
*attrs = outp->coda_mkdir.attr;
*newfid = outp->coda_mkdir.VFid;
struct coda_mkdir_in coda_mkdir;
struct coda_mkdir_out coda_mkdir;