Clean patches that merge together various fixes in the thin-dev tree.

Joe Thornber (11):
Unlock the superblock on an error path for new metadata dev creation.
Remove redundant arg from value_ptr()
[dm-thin] [bio prison] Don't use the bi_next field for the holder of
a cell.
[dm-thin] dm_thin_remove_block() wasn't decrementing the
mapped_blocks counter.
[dm-thin] btree-remove - fix rebalancing of 3 nodes.
Remove entries from the ref_count tree if they're no longer needed.
[dm-thin] Commit every second to prevent too much of a position
building up.
[dm-thin] Add support for external origins.
[dm-thin] Discard support part 1
[dm-thin] Add support for REQ_DISCARD
[dm-thin] some tidy ups of the __open_device() error path (Mike
Snitzer)

Documentation/device-mapper/thin-provisioning.txt | 38 ++-
drivers/md/dm-thin-metadata.c | 25 +-
drivers/md/dm-thin.c | 442 ++++++++++++++++-----
drivers/md/persistent-data/dm-btree-internal.h | 7 +-
drivers/md/persistent-data/dm-btree-remove.c | 202 ++++++----
drivers/md/persistent-data/dm-btree.c | 27 +-
drivers/md/persistent-data/dm-space-map-common.c | 3 -
7 files changed, 531 insertions(+), 213 deletions(-)

--
1.7.5.4

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