extern int smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon,
		       const char *name, struct cifs_sb_info *cifs_sb)
extern int smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon,
		       const char *name, struct cifs_sb_info *cifs_sb,
			   struct dentry *dentry)