dm thin: prepare to separate bio_prison code
The bio prison code will be useful to share with future DM targets. Prepare to move this code into a separate module, adding a dm prefix to structures and functions that will be exported. Signed-off-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NJoe Thornber <ejt@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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