dm: add support for passing through persistent reservations
This adds support to pass through persistent reservation requests similar to the existing ioctl handling, and with the same limitations, e.g. devices may only have a single target attached. This is mostly intended for multipathing. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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