From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 63E132EAE6; Wed, 22 Jan 2025 06:05:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737525944; cv=none; b=ATYJG8dNNBygWIz811VJ2DD275yDzR97Yc1Op6QrC+sGfDa3DgMsSLlnjw/O8Pv6MbBSPINS1pkAH/nqfFNKL97aWcmb5VZUKcgLBV9E8Pk5GGi34KI7/ySbyvG4TX3fdVeq25ODIfNqEY9zp6Gcu2TLeWL8Be2q9H7cZBtke+g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737525944; c=relaxed/simple; bh=C8xb2q2wb/qdNRvZ0IIAZ7pc/kza8Ocaz92/GhCLNwI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YdC2DYT2z1HKxtOqsP4e66ZHaE5tYjzqY6I9S1WqoYtF275zrp9xY82hC52hKkqehXtSfq1DnQ12VGHyqIfZQSAT1q0kiwIuxh6kDhCaohkRS8a9IWU/0MuRivgqxNECCM+incxTKOXo17dCOlPiNBE3MOGcZJltncM9hBqi0tI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=hDP9PhoZ; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hDP9PhoZ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=3c8fMqRFp7W4ULSrZsyUXZR7MWnLpaFuVa0XgO+nrMw=; b=hDP9PhoZChUBnCxrL+JSAFsrWX /P+Dbvdoc7eyiClKSj8lwaqnsubYlmbrZ6odfGTnbtuwv37WZdODDe7ByFOYTn10igIu5tSJEglpm /65H80ETFBmMyQDZ8BNX8lWA9S7F5Uq4+svVIQXs1t+mgXuijJsJCJ9Tuj4isTO3VidloFkendZTn HEKVnMTo4oRAH8iNABuprQ0bW92KR5cej8YwmcimXvyDZVpiMdaTcI1KRKTx90os2GPj7Me7uk6w9 Vknc21524ThrgQDVw26dMdkv7xgZyQbHwVMD8EKI0Bc4GQiyrZ4caWrUkNoE/vfErnIdZmEQyDrTf rLkhjRqQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1taTrw-00000009SGL-1UrO; Wed, 22 Jan 2025 06:05:40 +0000 Date: Tue, 21 Jan 2025 22:05:40 -0800 From: Christoph Hellwig To: "Darrick J. Wong" Cc: Amir Goldstein , Pali =?iso-8859-1?Q?Roh=E1r?= , ronnie sahlberg , Chuck Lever , Christian Brauner , Jan Kara , linux-fsdevel@vger.kernel.org, linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org, Steve French , Alexander Viro , xfs Subject: Re: Immutable vs read-only for Windows compatibility Message-ID: References: <20250114211050.iwvxh7fon7as7sty@pali> <0659dfe1-e160-40fd-b95a-5d319ca3504f@oracle.com> <20250114215350.gkc2e2kcovj43hk7@pali> <20250114235547.ncqaqcslerandjwf@pali> <20250114235925.GC3561231@frogsfrogsfrogs> <20250117173900.GN3557553@frogsfrogsfrogs> <20250117202112.GH3561231@frogsfrogsfrogs> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250117202112.GH3561231@frogsfrogsfrogs> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Fri, Jan 17, 2025 at 12:21:12PM -0800, Darrick J. Wong wrote: > > Full disclosure - I have an out of tree xfs patch that implements > > ioctls XFS_IOC_[GS]ETDOSATTRAT and stashes these > > attributes in the unused di_dmevmask space. > > [cc linux-xfs] > > Urrrrk, please don't fork the xfs ondisk format! Yeah, adding your own bits to any file system on-disk format is a huge no-go.