smb_vc_access
if (smb_vc_access(vcp, scred, vcspec->mode) != 0)
int smb_vc_access(struct smb_vc *vcp, struct smb_cred *scred, mode_t mode);
error = smb_vc_access(rqp->sr_vc, scred, SMBM_EXEC);