fo_fspacectl
error = fo_fspacectl(fp, cmd, &rmsr.r_offset, &rmsr.r_len, flags,
.fo_fspacectl = shm_fspacectl,
.fo_fspacectl = vn_fspacectl,
fo_fspacectl_t *fo_fspacectl;
if (fp->f_ops->fo_fspacectl == NULL)
return ((*fp->f_ops->fo_fspacectl)(fp, cmd, offset, length, flags,