[dm-devel] staged dm_internal_{suspend, resume} related changes for wider review

[Mike Snitzer]

I pushed rebased versions of these patches to linux-dm.git's
'dm-for-3.19' branch (and pulled into 'for-next' purely to get the
kernel.org autobuilders testing the code).  See top 3 commits here:
https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-for-3.19

I'm open to any and all changes or dropping code entirely; so me staging
like this is just to keep the review ball rolling as quickly as
possible.

But in particular we need to get Mikulas' and Bryn's feedback on how the
dm_internal_{suspend,resume} changes impact dm-stats.

Mike