Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp116529imu;
        Fri, 16 Nov 2018 18:43:33 -0800 (PST)
X-Google-Smtp-Source: AJdET5cV0uO75bqBPLWobOE1G8PilFazDlH9jxEkWJR4Inicm+OUcBmE5dZ2KsXqyFi/yov07xqS
X-Received: by 2002:a17:902:3143:: with SMTP id w61-v6mr13276995plb.58.1542422613321;
        Fri, 16 Nov 2018 18:43:33 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1542422613; cv=none;
        d=google.com; s=arc-20160816;
        b=IiQGRLoPSpBSDyEyFB+hzVfnMaBP8GFd/ipRHjazxORcD2UsJ9zSZ1bvg4Vp0GIWVA
         uKnpVdR7KKGPP7FQvxcbwTiMNMi26a8wsZI6KurTv/Zz/IFInjc3CKwCFGCKfYvfpQmV
         tQQvDJD2O74u+/NfRpk5HNdbRTKlXsPN3bAe2HV1tWwZ0OX7ICmvU3lLgFqchVcybTAh
         R540RpYtimywHl0J95mPo4UveQOkPPDnPztqGv6L/EgqLCPXGBitJ0TjZfmaDyE4xo8q
         Kw+GFH/xGAAvIodZ0xVjZucu0lA8MQvTnTdIaJK3adDkNnqPC6wNSsWILR1nvHg2VE8Y
         w9NA==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:sender:user-agent:in-reply-to
         :content-disposition:mime-version:references:message-id:subject:cc
         :to:from:date;
        bh=78s6SxDUMZ/d6WAFgt6kI788iGL7F5sDDGcOof/TALA=;
        b=XkOy2VHPu0nSPC3aDN0ztAPNj3BABVoxgzsEdwUEPOia6f+ZDG4E6uE/7ID6XsrmBd
         jJj2/uHsapCj0wUtngZLt8u3NinmQHEyH2Lp76AnZpPq+oMnHWyUK25/8g7mjJeRZ1cM
         gYx9L07e+YTpGhvkjBnWAy3lGLMCNkte0u0wyR0EsdyuUqYQxUymrpRpoSqcHJQExSyf
         khPNm0KmEEYesZz+Y2iLI3hNC2iTQsEq+iMWWnhuLjJ2NGPEmI1x1FLzQNmLNWQu7J01
         ZL0I57qOBvxrEJ1lvQVWuf+Ltw9zFSKcnadLCNrjdynvpxOpn/HhwDxE3IBpUUFYgLDW
         psGg==
ARC-Authentication-Results: i=1; mx.google.com;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org;
       dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
        by mx.google.com with ESMTP id k18si11100565pfd.241.2018.11.16.18.43.18;
        Fri, 16 Nov 2018 18:43:33 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Authentication-Results: mx.google.com;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org;
       dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1730259AbeKQM5o (ORCPT <rfc822;zcyberian@gmail.com> + 99 others);
        Sat, 17 Nov 2018 07:57:44 -0500
Received: from mx1.redhat.com ([209.132.183.28]:59302 "EHLO mx1.redhat.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1729750AbeKQM5n (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Sat, 17 Nov 2018 07:57:43 -0500
Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23])
        (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
        (No client certificate requested)
        by mx1.redhat.com (Postfix) with ESMTPS id CA9143082127;
        Sat, 17 Nov 2018 02:42:43 +0000 (UTC)
Received: from ming.t460p (ovpn-8-19.pek2.redhat.com [10.72.8.19])
        by smtp.corp.redhat.com (Postfix) with ESMTPS id 3D56619C7D;
        Sat, 17 Nov 2018 02:42:15 +0000 (UTC)
Date:   Sat, 17 Nov 2018 10:42:11 +0800
From:   Ming Lei <ming.lei@redhat.com>
To:     Christoph Hellwig <hch@lst.de>
Cc:     Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Dave Chinner <dchinner@redhat.com>,
        Kent Overstreet <kent.overstreet@gmail.com>,
        Mike Snitzer <snitzer@redhat.com>, dm-devel@redhat.com,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        linux-fsdevel@vger.kernel.org, Shaohua Li <shli@kernel.org>,
        linux-raid@vger.kernel.org, linux-erofs@lists.ozlabs.org,
        David Sterba <dsterba@suse.com>, linux-btrfs@vger.kernel.org,
        "Darrick J . Wong" <darrick.wong@oracle.com>,
        linux-xfs@vger.kernel.org, Gao Xiang <gaoxiang25@huawei.com>,
        Theodore Ts'o <tytso@mit.edu>, linux-ext4@vger.kernel.org,
        Coly Li <colyli@suse.de>, linux-bcache@vger.kernel.org,
        Boaz Harrosh <ooo@electrozaur.com>,
        Bob Peterson <rpeterso@redhat.com>, cluster-devel@redhat.com
Subject: Re: [PATCH V10 00/19] block: support multi-page bvec
Message-ID: <20181117024209.GD8872@ming.t460p>
References: <20181115085306.9910-1-ming.lei@redhat.com>
 <20181116140314.GA7735@lst.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20181116140314.GA7735@lst.de>
User-Agent: Mutt/1.9.1 (2017-09-22)
X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Sat, 17 Nov 2018 02:42:44 +0000 (UTC)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Fri, Nov 16, 2018 at 03:03:14PM +0100, Christoph Hellwig wrote:
> It seems like bi_phys_segments is still around of this series.
> Shouldn't it be superflous now?

Even though multi-page bvec is supported, the segment number doesn't
equal to the actual bvec count yet, for example, one bvec may be too
bigger to be held in one single segment.


Thanks,
Ming