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. NVMe support currently isn't included as I don't have a multihost NVMe setup to test on, but if I can find a volunteer to test it I'm happy to write the code for it. 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. I also have a set of simple test tools available at: git://git.infradead.org/users/hch/pr-tests.git -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
