Block integrity patches for 2.6.28

This patch series contains block layer integrity updates for 2.6.28.

There are a few fixes to the core bits, including a switch from
block_device to gendisk in the integrity compare function.  I also had
to add a helper to access a gendisk's integrity profile.  This is used
by MD.

The DM bits have been cleaned up and a separate dm_table_set_integrity
function has been introduced.  This allows us to avoid changing
dm_table_set_restrictions() and its callers.

The MD patch now correctly handles devices that come and go (as
requested by Neil).

The patches are against for-2.6.28 and depend on

    d7533ad0e132f92e75c1b2eb7c26387b25a583c1

being reverted.

--
Martin K. Petersen      Oracle Linux Engineering