Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1754447AbbHIGl5 (ORCPT <rfc822;w@1wt.eu>);
	Sun, 9 Aug 2015 02:41:57 -0400
Received: from bombadil.infradead.org ([198.137.202.9]:46394 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1753138AbbHIGlz (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Sun, 9 Aug 2015 02:41:55 -0400
Date: Sat, 8 Aug 2015 23:41:28 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Ming Lin <mlin@kernel.org>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
        Mike Snitzer <snitzer@redhat.com>,
        device-mapper development <dm-devel@redhat.com>,
        Ming Lei <ming.lei@canonical.com>, Christoph Hellwig <hch@lst.de>,
        Alasdair Kergon <agk@redhat.com>,
        Lars Ellenberg <drbd-dev@lists.linbit.com>,
        Philip Kelleher <pjk1939@linux.vnet.ibm.com>,
        Joshua Morris <josh.h.morris@us.ibm.com>,
        Christoph Hellwig <hch@infradead.org>,
        Kent Overstreet <kent.overstreet@gmail.com>,
        Nitin Gupta <ngupta@vflare.org>, Ming Lin <ming.l@ssi.samsung.com>,
        Oleg Drokin <oleg.drokin@intel.com>, Al Viro <viro@zeniv.linux.org.uk>,
        Jens Axboe <axboe@kernel.dk>,
        Andreas Dilger <andreas.dilger@intel.com>,
        Geoff Levand <geoff@infradead.org>, Jiri Kosina <jkosina@suse.cz>,
        lkml <linux-kernel@vger.kernel.org>, Jim Paris <jim@jtan.com>,
        Minchan Kim <minchan@kernel.org>, Dongsu Park <dpark@posteo.net>,
        drbd-user@lists.linbit.com
Subject: Re: [dm-devel] [PATCH v5 01/11] block: make generic_make_request
 handle arbitrarily sized bios
Message-ID: <20150809064128.GB2436@infradead.org>
References: <1436168690-32102-1-git-send-email-mlin@kernel.org>
 <20150731192337.GA8907@redhat.com>
 <CAF1ivSZbMDgyo_-wFGusSNSZ1fonSMWmNU9aVavGFaQsmEyYmQ@mail.gmail.com>
 <20150731213831.GA16464@redhat.com>
 <1438412290.26596.14.camel@hasee>
 <20150801163356.GA21478@redhat.com>
 <yq18u9liwhj.fsf@sermon.lab.mkp.net>
 <1439099990.7880.0.camel@hasee>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1439099990.7880.0.camel@hasee>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-SRS-Rewrite: SMTP reverse-path rewritten from <hch@infradead.org> by bombadil.infradead.org
	See http://www.infradead.org/rpr.html
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 786
Lines: 18

On Sat, Aug 08, 2015 at 10:59:50PM -0700, Ming Lin wrote:
> +/*
> + * Ensure that max discard sectors doesn't overflow bi_size and hopefully
> + * it is of the proper granularity as long as the granularity is a power
> + * of two.
> + */
> +#define MAX_DISCARD_SECTORS ((1U << 31) >> 9)

Thisn't isn't MAX_DISCARD_SECTORS, it's MAX_BIO_SECTORS.  If we ever
to something like Kent's multipage biovecs we'll actually need it for
regular read/write bios in addition to discard and write same.

Except for that the patch looks reasonable to me.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/