const char *mnt_fs_get_srcpath(struct libmnt_fs *fs)
{
	if (!fs)
		return NULL;

	/* fstab-like fs */
	if (fs->tagname)
		return NULL;	/* the source contains a "NAME=value" */
	return fs->source;
}
const char *mnt_fs_get_srcpath(struct libmnt_fs *fs)
{
	if (!fs)
		return NULL;

	 
	if (fs->tagname)
		return NULL;	 
	return fs->source;
}