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 8888CC56206 for ; Fri, 20 Feb 2026 15:32:51 +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=Vn/NiemWnDH+f/sF0poi6b0v0cIRyIEqcAwZGzyzE9s=; b=KS5Q4j//qyIoTFEx6woF7RI2t1 omlxpbg4iVQXjoSoQpo0EvpGKlk8Ghq2D11hNUVPjYL9wFBzMHaL2f0gzcin70FUWeDF8/0bNHJ9M AuEg4g5sJkoEGAIyIN7vsAeEv+yo5FMY46oQUsPwg3fKY/ZGsLyzeUtZ3MZoGL4SCpJf52of8JHrk GBP/sq/rYzZySDSFzx1Knok0+yBUTMgOfgkr3ruPLjS2kiwJVqiIwjkl1H3Ny/lKUxskgDdw8SATh Xbfnilk7B3e4w2634i2LUETvB8qonIIOifxyiS9tSMcSJKJJNB0D2RvlehIww2nyfeIDZ1cfiflha v7JaWWgA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vtSUp-0000000F2D9-2shV; Fri, 20 Feb 2026 15:32:47 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vtSUm-0000000F2B9-3ii6 for linux-nvme@lists.infradead.org; Fri, 20 Feb 2026 15:32:46 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 7852868B05; Fri, 20 Feb 2026 16:32:37 +0100 (CET) Date: Fri, 20 Feb 2026 16:32:37 +0100 From: Christoph Hellwig To: Hannes Reinecke Cc: Christoph Hellwig , Keith Busch , Sagi Grimberg , linux-nvme@lists.infradead.org, Abdulla Nasirli Subject: Re: [PATCHv2] nvmet: lift blocksize restriction to 64k Message-ID: <20260220153237.GB14359@lst.de> References: <20260220151259.20372-1-hare@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260220151259.20372-1-hare@kernel.org> 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-20260220_073245_071990_0B4EBFCC X-CRM114-Status: GOOD ( 12.11 ) 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 Fri, Feb 20, 2026 at 04:12:59PM +0100, Hannes Reinecke wrote: > With commit 47dd67532303 ("block/bdev: lift block size restrictions to 64k") > we can now support up to 64k block sizes, so lift the restriction on 4k for > file-backed namespaces. Still not sure this is a great idea by default. Yes, modern Linux supports 64k sector sizes, but even then just for a few file systems. And this changes existing setups, which will now break when upgrading the kernel. This needs an opt-in.