linux-kernel - [PATCH 0/6] Support DAX for device-mapper dm-linear devices

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Date:	Mon, 13 Jun 2016 16:21:31 -0600
From:	Toshi Kani <toshi.kani@....com>
To:	agk@...hat.com, snitzer@...hat.com, dan.j.williams@...el.com
Cc:	ross.zwisler@...ux.intel.com, viro@...iv.linux.org.uk,
	axboe@...nel.dk, toshi.kani@....com, linux-nvdimm@...ts.01.org,
	dm-devel@...hat.com, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/6] Support DAX for device-mapper dm-linear devices

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

---
 drivers/block/brd.c           |  2 +-
 drivers/md/dm-linear.c        | 19 +++++++++++++++++++
 drivers/md/dm-table.c         | 12 +++++++++---
 drivers/md/dm.c               | 38 ++++++++++++++++++++++++++++++++++++--
 drivers/md/dm.h               |  7 +++++++
 drivers/nvdimm/pmem.c         |  2 +-
 drivers/s390/block/dcssblk.c  |  1 +
 fs/block_dev.c                |  5 +++--
 include/linux/device-mapper.h | 15 +++++++++++++++
 include/linux/genhd.h         |  2 +-
 10 files changed, 93 insertions(+), 10 deletions(-)