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 X-Spam-Level: X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4E25C4332E for ; Mon, 4 Jan 2021 16:39:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73A752250F for ; Mon, 4 Jan 2021 16:39:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727932AbhADQiq (ORCPT ); Mon, 4 Jan 2021 11:38:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727897AbhADQip (ORCPT ); Mon, 4 Jan 2021 11:38:45 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 685EFC061793; Mon, 4 Jan 2021 08:38:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=jtkbapT8fmTkqdGfawodnxdn1L9OuJ2hV6kgW2yTqWk=; b=kPgHDr7sil9tk8p6Bt6Pg7BkoU qgIFz+hKZQewdgVs5RRcTUS8US4wERe/1Ik9TLb7yss87lkLOSjfChOBjgFVcdJGJqGqKRcfOclCn y+Fk/AajWS5n6Dnx+M7QBg4FrHcUBHQeD8KAxcb7SOO1nzdvOs9WceX3ackS4w9cx3Tr9zvtzhsMs htyNAT7f4vdjSW0tQ1tiAZL2lOrexShD800pjnGRTvsN6+Ry9GtpShUREBOFDmPg5+NQLyPvkMlo/ Zvj67UkaUamUNM9aDHexzMNReovVddfdRhtk68Bhu+gEPy71ABUAOCUPs7K0PQdTbD7vZs4RR+NIJ uNehDS9g==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1kwSrj-000JJd-C5; Mon, 04 Jan 2021 16:37:56 +0000 Date: Mon, 4 Jan 2021 16:37:55 +0000 From: Matthew Wilcox To: Pavel Begunkov Cc: linux-block@vger.kernel.org, Jens Axboe , Christoph Hellwig , Ming Lei , Johannes Weiner , Alexander Viro , "Darrick J . Wong" , "Martin K . Petersen" , Jonathan Corbet , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v2 2/7] bvec/iter: disallow zero-length segment bvecs Message-ID: <20210104163755.GA22407@casper.infradead.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Sat, Jan 02, 2021 at 03:17:34PM +0000, Pavel Begunkov wrote: > --- a/Documentation/filesystems/porting.rst > +++ b/Documentation/filesystems/porting.rst > @@ -865,3 +865,10 @@ no matter what. Everything is handled by the caller. > > clone_private_mount() returns a longterm mount now, so the proper destructor of > its result is kern_unmount() or kern_unmount_array(). > + > +--- > + > +**mandatory** > + > +zero-length bvec segments are disallowed, they must be filtered out before > +passed on to an iterator. Why are you putting this in filesystems/porting? Filesystems don't usually generate bvecs ... there's nothing in this current series that stops them. I'd suggest Documentation/block/biovecs.rst or biodoc.rst (and frankly, biodoc.rst needs a good cleanup)