CIFSFindFirst
rc = CIFSFindFirst(xid, tcon, full_path,
rc = CIFSFindFirst(xid, tcon, path, cifs_sb,
rc = CIFSFindFirst(xid, tcon, full_path, cifs_sb, NULL,
int CIFSFindFirst(const unsigned int xid, struct cifs_tcon *tcon,