[GIT PULL] Block fixes for 3.16-rc1

[Jens Axboe <axboe@fb.com>]

Hi Linus,

A smaller collection of fixes for the block core that would be nice to
have in -rc2. This pull request contains:

- Fixes for races in the wait/wakeup logic used in blk-mq from
  Alexander. No issues have been observed, but it is definitely a bit
  flakey currently. Alternatively, we may drop the cyclic wakeups going
  forward, but that needs more testing.

- Some cleanups from Christoph.

- Fix for an oops in null_blk if queue_mode=1 and softirq completions
  are used. From me.

- A fix for a regression caused by the chunk size setting. It
  inadvertently used max_hw_sectors instead of max_sectors, which is
  incorrect, and causes hangs on btrfs multi-disk setups (where hw
  sectors apparently isn't set). From me.

- Removal of WQ_POWER_EFFICIENT in the kblockd creation. This was a
  recent addition as well, but it actually breaks blk-mq which relies on
  strict scheduling. If the workqueue power_efficient mode is turned on,
  this breaks blk-mq. From Matias.

- null_blk module parameter description fix from Mike.


Please pull!


  git://git.kernel.dk/linux-block.git for-linus


----------------------------------------------------------------
Alexander Gordeev (3):
      blk-mq: bitmap tag: fix races on shared ::wake_index fields
      blk-mq: bitmap tag: fix race on blk_mq_bitmap_tags::wake_cnt
      blk-mq: bitmap tag: fix races in bt_get() function

Christoph Hellwig (3):
      block: remove elv_abort_queue and blk_abort_flushes
      blk-mq: properly drain stopped queues
      blk-mq: merge blk_mq_drain_queue and __blk_mq_drain_queue

Jens Axboe (2):
      null_blk: fix softirq completions for queue_mode == 1
      block: blk_max_size_offset() should check ->max_sectors

Matias Bjørling (1):
      block: remove WQ_POWER_EFFICIENT from kblockd

Mike Snitzer (1):
      null_blk: fix name and description of 'queue_mode' module parameter

 block/blk-core.c         |  3 +--
 block/blk-flush.c        | 38 -------------------------------
 block/blk-mq-tag.c       | 59 +++++++++++++++++++++++++++++++-----------------
 block/blk-mq-tag.h       |  2 +-
 block/blk-mq.c           | 11 +++------
 block/blk.h              |  1 -
 block/elevator.c         | 20 ----------------
 drivers/block/null_blk.c |  7 ++++--
 include/linux/blk-mq.h   |  2 +-
 include/linux/blkdev.h   |  2 +-
 include/linux/elevator.h |  1 -
 11 files changed, 50 insertions(+), 96 deletions(-)

-- 
Jens Axboe