First release

Kernel [14/16]

[X] CRC bitmaps :ejt:
[X] pool_destroy ref counting isn’t right :ejt: This should be done as part of the data resizing work.
[X] Test and complete pool resizing work :ejt:
[X] Test device deletion :mike:
[X] Test creation/removal of large numbers of devices :mike:
[X] wire up btree value_types :ejt:
[X] printks :mike: These need an audit. Spurious ones removing, most converting to DMWARNS etc.
[X] symbolic flag field on pool target param :mike:
[X] implement btree highest key :ejt:
[X] mapped blocks count isn’t being set :ejt:
[X] extend method for space maps (needed for resizing) :ejt:
[X] rename multisnap -> thin. Rebranding exercise :ejt:, :mike:
[X] crc metadata sm index :ejt:
[X] return zeroes for unprovisioned reads :ejt:
[ ] Check reference counts are correct somehow. :ejt:
[ ] some work needs to be done to verify tearing down thin devices when the pool has run out of space is done cleanly :ejt:

All tools run offline for first release.

[ ] factor common code in space map
[ ] resize metadata device
[ ] implement the btree trimming
[ ] external origin (read-only)
[ ] Discard
[ ] a bug found in the userland tools, check that nr_free in the last index entry is being set correctly if there are fewer than a whole blocks worth. Also check this is extended correctly.
[ ] RHEL6.2 needs kzalloc

[ ] We need tests with multiple pools
[ ] Integrate Kabi’s ramdisk tests, and use the pattern stomp program he’s found (http://www.scsifaq.org/RMiller_Tools/dt.html).