From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sabe.cs.wisc.edu ([128.105.6.20]:42000 "EHLO sabe.cs.wisc.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756575AbcAJBWJ (ORCPT ); Sat, 9 Jan 2016 20:22:09 -0500 Message-ID: <5691B208.9060001@cs.wisc.edu> Date: Sat, 09 Jan 2016 19:21:12 -0600 From: Mike Christie MIME-Version: 1.0 To: device-mapper development , mchristi@redhat.com CC: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, xfs@oss.sgi.com, linux-scsi@vger.kernel.org, konrad.wilk@oracle.com, linux-kernel@vger.kernel.org, philipp.reisner@linbit.com, linux-f2fs-devel@lists.sourceforge.net, linux-raid@vger.kernel.org, ocfs2-devel@oss.oracle.com, target-devel@vger.kernel.org, linux-mtd@lists.infradead.org, osd-dev@open-osd.org, linux-fsdevel@vger.kernel.org, lars.ellenberg@linbit.com, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, drbd-dev@lists.linbit.com Subject: Re: [dm-devel] [PATCH 02/35] block: add REQ_OP definitions and bi_op/op fields References: <1452027218-32303-1-git-send-email-mchristi@redhat.com> <1452027218-32303-3-git-send-email-mchristi@redhat.com> <20160109133716.GB26660@infradead.org> <5691AC2E.2050403@cs.wisc.edu> In-Reply-To: <5691AC2E.2050403@cs.wisc.edu> Content-Type: text/plain; charset=windows-1252 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 01/09/2016 06:56 PM, Mike Christie wrote: > On 01/09/2016 07:37 AM, Christoph Hellwig wrote: >> Seems like this is missing REQ_OP_FLUSH, which still hides as a write? >> Oh yeah, to answer the second part of your question, REQ_OP_FLUSH is only a flush operation like what request_fn drivers wanted. REQ_PREFLUSH can be set with a REQ_OP_WRITE bio when filesystems want to do both. There is then the case where filesystems and blkdev_issue_flush could just want to request a flush. I left them as a REQ_PREFLUSH with REQ_OP_WRITE set, so there would be a single code path. > > I might have misunderstood what you wanted or am misunderstanding you now. > > I did not change the flush related code until the last patches. I added > REQ_OP_FLUSH in patch: > > [PATCH 33/35] block, drivers: add REQ_OP_FLUSH operation > commit 18dea20363ba245a47bc1bb54f6465b8a05b19af > Author: Mike Christie > Date: Tue Jan 5 21:02:17 2016 -0600 > > block, drivers: add REQ_OP_FLUSH operation > > > and I added the REQ_PREFLUSH flag in > > > [PATCH 35/35] block, drivers, fs: rename REQ_FLUSH to REQ_PREFLUSH > commit 303dc6a7cc3673065538ba041562fcd833a619af > Author: Mike Christie > Date: Thu Jan 7 18:17:03 2016 -0600 > > block, drivers, fs: rename REQ_FLUSH to REQ_PREFLUSH > > > I did them in separate patches, because I was not sure if they were > correct with what you requested before, and because they were a little > more tricky because of how request_fn drivers, make_request_fn drivers, > and dm-multipath handle flushes differently. > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >