On Wed, Sep 21, 2016 at 11:04:27AM -0400, Mike Snitzer wrote:
> Which kernel are you using?  Christoph (now cc'd) has introduced a new
> PR api.  I merged a fix from him relatively recently (commit 9c72bad1f3
> "dm: call PR reserve/unreserve on each underlying device")

The PR API will handle this fine, but mpathpersist isn't using it yet.
Switching mpathpersist to use the API if available would be a useful

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