[dm-devel] [PATCH 0/6] Support DAX for device-mapper dm-linear devices
Dan Williams
dan.j.williams at intel.com
Mon Jun 13 23:18:18 UTC 2016
Thanks Toshi!
On Mon, Jun 13, 2016 at 3:21 PM, Toshi Kani <toshi.kani at 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.
I don't mind this, but it seems a policy decision that the kernel does
not need to make. A sufficiently sophisticated user could cope with
DAX being available at varying LBAs. Would it be sufficient to move
this policy decision to userspace tooling?
> The direct_access interface is added to dm and dm-linear to map
> a request to a target device.
I had dm-linear and md-raid0 support on my list of things to look at,
did you have raid0 in your plans?
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