[GIT PULL] Core block IO bits for 4.2

[Jens Axboe <axboe@fb.com>]

Hi Linus,

This is the core block pull request for 4.2. Nothing really major in
here, mostly a collection of smaller optimizations and cleanups, mixed
with various fixes. In more detail, this pull request contains:

- Addition of policy specific data to blkcg for block cgroups. From
  Arianna Avanzini.

- Various cleanups around command types from Christoph.

- Cleanup of the suspend block I/O path from Christoph.

- Plugging updates from Shaohua and Jeff Moyer, for blk-mq.

- Eliminating atomic inc/dec of both remaining IO count and reference
  count in a bio. From me.

- Fixes for SG gap and chunk size support for data-less (discards) IO,
  so we can merge these better. From me.

- Small restructuring of blk-mq shared tag support, freeing drivers from
  iterating hardware queues. From Keith Busch.

- A few cfq-iosched tweaks, from Tahsin Erdogan and me. Makes the IOPS
  mode the default for non-rotational storage.


Please pull!


  git://git.kernel.dk/linux-block.git for-4.2/core


----------------------------------------------------------------
Arianna Avanzini (1):
      block, cgroup: implement policy-specific per-blkcg data

Christoph Hellwig (11):
      block: rename REQ_TYPE_SPECIAL to REQ_TYPE_DRV_PRIV
      block: move REQ_TYPE_ATA_TASKFILE and REQ_TYPE_ATA_PC to ide.h
      block: move REQ_TYPE_SENSE to the ide driver
      block: remove REQ_TYPE_PM_SHUTDOWN
      block: move PM request support to IDE
      nbd: stop using req->cmd
      block: use an atomic_t for mq_freeze_depth
      block: remove BIO_EOPNOTSUPP
      block: remove unused BIO_RW_BLOCK and BIO_EOF flags
      suspend: simplify block I/O handling
      block, dm: don't copy bios for request clones

Jarod Wilson (1):
      block: export blkdev_reread_part() and __blkdev_reread_part()

Jeff Moyer (1):
      blk-mq: fix plugging in blk_sq_make_request

Jens Axboe (10):
      bio: skip atomic inc/dec of ->bi_remaining for non-chains
      bio: skip atomic inc/dec of ->bi_cnt for most use cases
      block: collapse bio bit space
      block: only honor SG gap prevention for merges that contain data
      block: don't honor chunk sizes for data-less IO
      block: add blk_set_queue_dying() to blkdev.h
      cfq-iosched: fix the setting of IOPS mode on SSDs
      cfq-iosched: move group scheduling functions under ifdef
      cfq-iosched: fix sysfs oops when attempting to read unconfigured weights
      cfq-iosched: fix other locations where blkcg_to_cfqgd() can return NULL

Julia Lawall (1):
      block: fix returnvar.cocci warnings

Keith Busch (1):
      blk-mq: Shared tag enhancements

Mike Snitzer (1):
      block: remove management of bi_remaining when restoring original bi_end_io

Ming Lei (1):
      block: replace trylock with mutex_lock in blkdev_reread_part()

Shaohua Li (5):
      blk: clean up plug
      sched: always use blk_schedule_flush_plug in io_schedule_out
      blk-mq: avoid re-initialize request which is failed in direct dispatch
      blk-mq: do limited block plug for multiple queue case
      blk-mq: make plug work for mutiple disks and queues

Steven Rostedt (1):
      blktrace: Add blktrace.c to BLOCK LAYER in MAINTAINERS file

Tahsin Erdogan (1):
      block: Make CFQ default to IOPS mode on SSDs

 MAINTAINERS                  |   1 +
 block/bio-integrity.c        |   4 +-
 block/bio.c                  |  77 +++++++++++--------
 block/blk-cgroup.c           |  92 ++++++++++++++++++++---
 block/blk-cgroup.h           |  40 ++++++++--
 block/blk-core.c             | 136 +++++++++-------------------------
 block/blk-exec.c             |  10 ---
 block/blk-merge.c            |   3 +-
 block/blk-mq-tag.c           |  38 ++++++++++
 block/blk-mq-tag.h           |   1 +
 block/blk-mq.c               | 160 +++++++++++++++++++++++++---------------
 block/blk.h                  |   5 +-
 block/bounce.c               |   3 -
 block/cfq-iosched.c          | 125 +++++++++++++++++++++++++------
 block/elevator.c             |   2 +
 block/ioctl.c                |  37 ++++++++--
 drivers/block/nbd.c          |  50 ++++++-------
 drivers/block/paride/pd.c    |   4 +-
 drivers/block/sx8.c          |   4 +-
 drivers/block/virtio_blk.c   |   6 +-
 drivers/ide/ide-atapi.c      |  10 +--
 drivers/ide/ide-cd.c         |  10 +--
 drivers/ide/ide-cd_ioctl.c   |   2 +-
 drivers/ide/ide-devsets.c    |   2 +-
 drivers/ide/ide-eh.c         |   4 +-
 drivers/ide/ide-floppy.c     |   8 +-
 drivers/ide/ide-io.c         |  12 +--
 drivers/ide/ide-ioctls.c     |   2 +-
 drivers/ide/ide-park.c       |   4 +-
 drivers/ide/ide-pm.c         |  56 ++++++++++----
 drivers/ide/ide-tape.c       |   6 +-
 drivers/ide/ide-taskfile.c   |   2 +-
 drivers/md/bcache/io.c       |   2 +-
 drivers/md/bcache/request.c  |   2 +-
 drivers/md/dm-cache-target.c |   6 --
 drivers/md/dm-raid1.c        |   2 -
 drivers/md/dm-snap.c         |   1 -
 drivers/md/dm-table.c        |  25 ++++---
 drivers/md/dm-thin.c         |   9 +--
 drivers/md/dm-verity.c       |   2 +-
 drivers/md/dm.c              | 171 ++++++++++---------------------------------
 drivers/md/dm.h              |   5 +-
 fs/btrfs/disk-io.c           |  13 +---
 fs/btrfs/extent_io.c         |   2 -
 fs/btrfs/volumes.c           |  18 ++---
 fs/btrfs/volumes.h           |   2 -
 fs/buffer.c                  |  13 +---
 fs/ext4/page-io.c            |   1 -
 fs/nilfs2/segbuf.c           |  12 ---
 fs/xfs/xfs_aops.c            |   1 -
 include/linux/bio.h          |  17 ++++-
 include/linux/blk-mq.h       |   4 +
 include/linux/blk_types.h    |  25 ++++---
 include/linux/blkdev.h       |  45 ++----------
 include/linux/elevator.h     |   2 +
 include/linux/fs.h           |   3 +
 include/linux/ide.h          |  27 +++++++
 include/linux/swap.h         |   1 -
 include/uapi/linux/nbd.h     |   2 -
 kernel/power/Makefile        |   3 +-
 kernel/power/block_io.c      | 103 --------------------------
 kernel/power/power.h         |   9 ---
 kernel/power/swap.c          | 159 ++++++++++++++++++++++++++++++----------
 kernel/sched/core.c          |   5 +-
 mm/page_io.c                 |   2 +-
 65 files changed, 853 insertions(+), 757 deletions(-)
 delete mode 100644 kernel/power/block_io.c

-- 
Jens Axboe