[PATCH v2 0/3] Support DAX for device-mapper dm-linear devices

[Toshi Kani <toshi.kani-ZPxbGqLxI0U@public.gmane.org>]

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.

The patches replace v1 series at:
http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=wip

v2:
 - Fix issue with partitioning.
 - Change to add DAX flag to a request queue.

---
Toshi Kani (3):
 1/3 block: add QUEUE_FLAG_DAX for devices to advertise their DAX support
 2/3 dm: add infrastructure for DAX support
 3/3 dm linear: add DAX support

---
 drivers/block/brd.c           |  4 +++-
 drivers/md/dm-linear.c        | 23 ++++++++++++++++++++++-
 drivers/md/dm-table.c         | 23 ++++++++++++++++++++---
 drivers/md/dm.c               | 36 +++++++++++++++++++++++++++++++++++-
 drivers/md/dm.h               |  1 +
 drivers/nvdimm/pmem.c         |  1 +
 drivers/s390/block/dcssblk.c  |  1 +
 fs/block_dev.c                |  5 +++--
 include/linux/blkdev.h        |  2 ++
 include/linux/device-mapper.h | 16 ++++++++++++++++
 10 files changed, 104 insertions(+), 8 deletions(-)