From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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.lore.kernel.org (Postfix) with ESMTPS id 0A476CF9C71 for ; Tue, 24 Sep 2024 05:36:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=CJO1+eknrcO/xCcK/ZREiK1Tk/lTFRx+Valy0zXDX1Q=; b=uUArHiRqdTnohC2ptS1a81jN9p 6CUb/e1wLb0LLD3MVwwQxr9LM9ORtL5vLc4bWrhDYYF+LWVLJ4N9mub5EXYsXx8T3NWTtXMI33lHP y8zPbxHFDP32DpZ/M8XB9NZs5xzluNFYwNMZi5AS6wvGGfkTefzo93yfpbcpg6NAS5/M7XKHrJ3ci l6N8p5JbmcD3HHLDifCbUk5n5T9L48FzfSOzCcrKLCkV6QfKX/zIVljxs6shlVsxUaUISYMc0XcyZ NvszTmv/085IfCckUGk6/ycnlw9+DLMKM+5t4EmPzH7+Qng1dlui4e4/t8XZ1PJ/MiZEAq5dgsI7p 5P7aYyig==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1ssyEF-0000000186A-2xNt; Tue, 24 Sep 2024 05:36:51 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1ssyEC-0000000185g-2FTr for linux-nvme@lists.infradead.org; Tue, 24 Sep 2024 05:36:50 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 9E783227A8E; Tue, 24 Sep 2024 07:36:44 +0200 (CEST) Date: Tue, 24 Sep 2024 07:36:44 +0200 From: Christoph Hellwig To: "Martin K. Petersen" Cc: Anuj Gupta , Christoph Hellwig , Kanchan Joshi , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-nvme@lists.infradead.org Subject: Re: fine-grained PI control Message-ID: <20240924053644.GA10569@lst.de> References: <20240705083205.2111277-1-hch@lst.de> <20240918063910.hqntgm5jy2jisys2@green245> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240923_223648_741922_06CF3FAB X-CRM114-Status: GOOD ( 12.90 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Mon, Sep 23, 2024 at 09:59:10PM -0400, Martin K. Petersen wrote: > Originally we had code in Linux allowing filesystems to attach > additional metadata to bios which would then be stored in the app tag > space. This was intended for backpointers but never really took off. > However, if we move the burden of PI generation to filesystems as > Christoph suggested, then we can revisit using the app tag space. Just to make clear I want file systems to be able to opt into generating PI, not get rid of the auto generation. That is actually kinda possible already, I just want to make it nicer.