Merge tag 'for-4.16/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix an uninitialized variable false warning in dm bufio

 - Fix DM's passthrough ioctl support to be race free against an
   underlying device being removed.

 - Fix corner-case of DM raid resync reporting if/when the raid becomes
   degraded during resync; otherwise automated raid repair will fail.

 - A few DM multipath fixes to make non-SCSI optimizations, that were
   introduced during the 4.16 merge, useful for all non-SCSI devices,
   rather than narrowly define this non-SCSI mode in terms of "nvme".

   This allows the removal of "queue_mode nvme" that really didn't need
   to be introduced. Instead DM core will internalize whether
   nvme-specific IO submission optimizations are doable and DM multipath
   will only do SCSI-specific device handler operations if SCSI is in
   use.

* tag 'for-4.16/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm table: allow upgrade from bio-based to specialized bio-based variant
  dm mpath: remove unnecessary NVMe branching in favor of scsi_dh checks
  dm table: fix "nvme" test
  dm raid: fix incorrect sync_ratio when degraded
  dm: use blkdev_get rather than bdgrab when issuing pass-through ioctl
  dm bufio: avoid false-positive Wmaybe-uninitialized warning

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