ceph: drop support for preferred_osd pgs
This was an ill-conceived feature that has been removed from Ceph. Do this gracefully: - reject attempts to specify a preferred_osd via the ioctl - stop exposing this information via virtual xattrs - always fill in -1 for requests, in case we talk to an older server - don't calculate preferred_osd placements/pgids Reviewed-by: NAlex Elder <elder@inktank.com> Signed-off-by: NSage Weil <sage@inktank.com>
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