From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754404Ab2ITXiZ (ORCPT ); Thu, 20 Sep 2012 19:38:25 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:44336 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753634Ab2ITXiX (ORCPT ); Thu, 20 Sep 2012 19:38:23 -0400 Date: Thu, 20 Sep 2012 16:38:20 -0700 From: Kent Overstreet To: Tejun Heo Cc: linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com, axboe@kernel.dk, neilb@suse.de Subject: Re: [PATCH v2 02/26] block: Add bio_advance() Message-ID: <20120920233820.GD5519@google.com> References: <1347322957-25260-1-git-send-email-koverstreet@google.com> <1347322957-25260-3-git-send-email-koverstreet@google.com> <20120920215827.GF7264@google.com> <20120920231308.GB5519@google.com> <20120920232506.GI7264@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120920232506.GI7264@google.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 20, 2012 at 04:25:06PM -0700, Tejun Heo wrote: > Hello, > > On Thu, Sep 20, 2012 at 04:13:08PM -0700, Kent Overstreet wrote: > > I just cut and pasted that from blk_update_request(), which is what the > > next patch refactors... > > Yeah, well, that was written when we didn't have WARNs. > > > But yes it would be a bug. It gets converted to a BUG_ON() in a later > > patch (not in this series), as this gets further abstracted into a > > wrapper around bvec_advance_iter() which doesn't know about struct bio > > (as bio integrity gets its own iterator). > > WARN() generally preferable unless there's no way at all to continue. > Storage layer could be a bit different if immediate danger for data > corruption exists but the general consensus seems that we're too > trigger happy with BUG_ON()s. Yeah. Changed it to a WARN_ONCE().