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SubjectRe: [PATCH 0/6] Support DAX for device-mapper dm-linear devices
On Mon, Jun 13 2016 at  6:21pm -0400,
Toshi Kani <toshi.kani@hpe.com> 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

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