Persistent Reservation API V4

Mike Snitzer snitzer at
Wed Oct 28 11:43:56 PDT 2015

On Thu, Oct 15 2015 at  8:10am -0400,
Christoph Hellwig <hch at> wrote:

> This series adds support for a simplified Persistent Reservation API
> to the block layer.  The intent is that both in-kernel and userspace
> consumers can use the API instead of having to hand craft SCSI or NVMe
> command through the various pass through interfaces.  It also adds
> DM support as getting reservations through dm-multipath is a major
> pain with the current scheme.
> The ioctl API is documented in Documentation/block/pr.txt, but to
> fully understand the concept you'll have to read up the SPC spec,
> PRs are too complicated that trying to rephrase them into different
> terminology is just going to create confusion.
> Note that Mike wants to include the DM patches so through the DM
> tree, so they are only included for reference.

I looked at these again and the DM changes look good.  Any update on
if/when the block changes will land?

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