cifs_convert_flags
desired_access = cifs_convert_flags(cfile->f_flags, rdwr_for_fscache);
desired_access = cifs_convert_flags(cfile->f_flags, 0);
if (cifs_convert_flags(oflags, orw) != cifs_convert_flags(cflags, crw))
desired_access = cifs_convert_flags(f_flags, rdwr_for_fscache);
desired_access = cifs_convert_flags(f_flags, 0);