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Re: Persistent Reservation API V4

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  Re: Persistent Reservation API V4 Mike Snitzer <snitzer@redhat.com> - 2015-10-28 19:50 +0100
    Re: Persistent Reservation API V4 Mike Snitzer <snitzer@redhat.com> - 2015-10-28 19:50 +0100

#1258365 — Re: Persistent Reservation API V4

On Thu, Oct 15 2015 at  8:10am -0400,
Christoph Hellwig <hch@lst.de> 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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#1258366

On Wed, Oct 28 2015 at  2:43pm -0400,
Mike Snitzer <snitzer@redhat.com> wrote:

> On Thu, Oct 15 2015 at  8:10am -0400,
> Christoph Hellwig <hch@lst.de> 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?

I should've looked at Jens' tree before asking.. I now see Jens has
for-4.4/reservations

I'll rebase accordingly and pick up the DM changes.
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