- a DM verity fix for a mode when no salt is used

- a fix to DM to account for the possibility that PREFLUSH or FUA are
  used without the SYNC flag if the underlying storage doesn't have a
  volatile write-cache

- a DM ioctl memory allocation flag fix to use __GFP_HIGH to allow
  emergency forward progress (by using memory reserves as last resort)

- a small DM integrity cleanup to use kvmalloc() instead of duplicating
  the same
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