[persisent-data, dm-array, dm-bitset] comment #endifs
[persistent-data, dm-bitset] Add some more documentation to header and rename a function.

dm_bitset_info_init -> dm_disk_bitset_init.
[dm-bio-prison] Clarify fail conditions for dm_bio_prison_alloc_cell
Merge branch 'thin-dev' into all-caches