From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: [PATCH 0/6] Support DAX for device-mapper dm-linear devices Date: Mon, 13 Jun 2016 18:57:57 -0400 Message-ID: <20160613225756.GA18417@redhat.com> References: <1465856497-19698-1-git-send-email-toshi.kani@hpe.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1465856497-19698-1-git-send-email-toshi.kani@hpe.com> Sender: linux-kernel-owner@vger.kernel.org To: Toshi Kani Cc: agk@redhat.com, dan.j.williams@intel.com, ross.zwisler@linux.intel.com, viro@zeniv.linux.org.uk, axboe@kernel.dk, linux-nvdimm@ml01.01.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-raid.ids On Mon, Jun 13 2016 at 6:21pm -0400, Toshi Kani wrote: > This patch-set adds DAX support to device-mapper dm-linear devices > used by LVM. It works with LVM commands as follows: > - Creation of a logical volume with all DAX capable devices (such > as pmem) sets the logical volume DAX capable as well. > - Once a logical volume is set to DAX capable, the volume may not > be extended with non-DAX capable devices. > > The direct_access interface is added to dm and dm-linear to map > a request to a target device. > > - Patch 1-2 introduce GENHD_FL_DAX flag to indicate DAX capability. > - Patch 3-4 add direct_access functions to dm and dm-linear. > - Patch 5-6 set GENHD_FL_DAX to dm when all targets are DAX capable. > > --- > Toshi Kani (6): > 1/6 genhd: Add GENHD_FL_DAX to gendisk flags > 2/6 block: Check GENHD_FL_DAX for DAX capability > 3/6 dm: Add dm_blk_direct_access() for mapped device > 4/6 dm-linear: Add linear_direct_access() > 5/6 dm, dm-linear: Add dax_supported to dm_target > 6/6 dm: Enable DAX support for mapper device Thanks a lot for doing this. I recently added it to my TODO so your patches come at a great time. I'll try to get to reviewing/testing your work by the end of this week. Mike