switch blk-cgroup to work on gendisk v2

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Hi all,

blk-cgroup works on only on live disks and "file system" I/O from bios.
This all the information should be in the gendisk, and not the
request_queue that also exists for pure passthrough request based
devices.

Changes since v1:
 - use the local disk variable in wbt_init instead of q->disk
 - various spelling fixes

Diffstat:
 block/bfq-cgroup.c        |   18 ++--
 block/bfq-iosched.c       |    6 -
 block/blk-cgroup-rwstat.c |    2 
 block/blk-cgroup.c        |  185 +++++++++++++++++++++-------------------------
 block/blk-cgroup.h        |   41 ++++------
 block/blk-iocost.c        |   40 ++++-----
 block/blk-iolatency.c     |   41 ++++------
 block/blk-ioprio.c        |    6 -
 block/blk-mq-debugfs.c    |   10 --
 block/blk-rq-qos.c        |   67 ++++++++++++++++
 block/blk-rq-qos.h        |   66 +---------------
 block/blk-stat.c          |    3 
 block/blk-sysfs.c         |    4 
 block/blk-throttle.c      |   31 ++++---
 block/blk-wbt.c           |   39 ++++-----
 block/blk-wbt.h           |   12 +-
 block/genhd.c             |   17 ++--
 include/linux/blkdev.h    |   10 +-
 include/linux/sched.h     |    2 
 kernel/fork.c             |    2 
 mm/swapfile.c             |    2 
 21 files changed, 292 insertions(+), 312 deletions(-)



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