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device-mapper locking rework

Hi folks,

After some discussion with rmind@ and blymn@ I tried to implement better locking protocol for my dm driver. I'm attaching result of my work as diff against current this diff probably can't be cleanly applied to current haad-dm sources therefore
I have uploaded my sources here [1].


1) Testing

2) Think about if current state of ioctl-> ioctl synchronisation is o, if not add
   ioctl call reference counter like I did for io/table users.


Attachment: dm_locking.diff
Description: Binary data



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