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Subject[PATCH 0/6] Support DAX for device-mapper dm-linear devices
Date
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(-)

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