On Mon, Jun 13 2016 at 6:57pm -0400, Mike Snitzer <snitzer@xxxxxxxxxx> wrote: > On Mon, Jun 13 2016 at 6:21pm -0400, > Toshi Kani <toshi.kani@xxxxxxx> 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. I rebased your patches on linux-dm.git's 'for-next' (which includes what I've already staged for the 4.8 merge window). And I folded/changed some of the DM patches so that there are only 2 now (1 for DM core and 1 for dm-linear). Please see the 4 topmost commits in my 'wip' here: http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=wip Feel free to pick these patches up to use as the basis for continued work or re-posting of this set.. either that or I could post them as v2 on your behalf. As for testing, I've verified that basic IO works to a pmem-based DM linear device and that mixed table types are rejected as expected. Mike -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
