[GIT PULL] Core block IO changes for 3.20

[GIT PULL] Core block IO changes for 3.20

[Jens Axboe]

Hi Linus,

This pull request is for the core block IO changes. It contains:

- A series from Christoph that cleans up and refactors various parts of
  the REQ_BLOCK_PC handling. Contributions in that series form Dongsu
  Park and Kent Overstreet as well.

- CFQ:
        - A bug fix for cfq for realtime IO scheduling from Jeff Moyer.
        - A stable patch fixing a potential crash in CFQ in OOM
          situations. From Konstantin Khlebnikov.

- blk-mq:
        - Add support for tag allocation policies, from Shaohua. This is
          a prep patch enabling libata (and other SCSI parts) to use the
          blk-mq tagging, instead of rolling their own.
        - Various little tweaks from Keith and Mike, in preparation for
          DM blk-mq support.
        - Minor little fixes or tweaks from me.
        - A double free error fix from Tony Battersby.

- The partition 4k issue fixes from Matthew and Boaz.

- Add support for zero+unprovision for blkdev_issue_zeroout() from
  Martin.


Please pull!


  git://git.kernel.dk/linux-block.git for-3.20/core

----------------------------------------------------------------
Boaz Harrosh (1):
      block: Remove annoying "unknown partition table" message

Christoph Hellwig (7):
      block: simplify bio_map_kern
      block: use blk_rq_map_user_iov to implement blk_rq_map_user
      block: add a helper to free bio bounce buffer pages
      block: merge __bio_map_kern into bio_map_kern
      block: merge __bio_map_user_iov into bio_map_user_iov
      block: handle the null_mapped flag correctly in blk_rq_map_user_iov
      block: remove unused function blk_bio_map_sg

Dongsu Park (1):
      block: rewrite and split __bio_copy_iov()

Jeff Moyer (1):
      cfq-iosched: fix incorrect filing of rt async cfqq

Jens Axboe (4):
      Merge tag 'v3.19-rc2' into for-3.20/core
      blk-mq: export blk_mq_freeze_queue()
      blk-mq: fix false negative out-of-tags condition
      blk-mq: make blk_mq_run_queues() static

Keith Busch (4):
      block: require blk_rq_prep_clone() be given an initialized clone request
      block: add blk-mq support to blk_insert_cloned_request()
      block: keep established cmd_flags when cloning into a blk-mq request
      block: prevent request-to-request merging with gaps if not allowed

Kent Overstreet (1):
      block: pass iov_iter to the BLOCK_PC mapping functions

Konstantin Khlebnikov (1):
      cfq-iosched: handle failure of cfq group allocation

Martin K. Petersen (2):
      block: Add discard flag to blkdev_issue_zeroout() function
      block: Quiesce zeroout wrapper

Matthew Wilcox (1):
      block: Change direct_access calling convention

Mike Snitzer (2):
      block: mark blk-mq devices as stackable
      dm: fix multipath regression due to initializing wrong request

Shaohua Li (2):
      block: support different tag allocation policy
      blk-mq: add tag allocation policy

Tony Battersby (1):
      blk-mq: fix double-free in error path

 Documentation/filesystems/xip.txt  |  15 +-
 arch/powerpc/sysdev/axonram.c      |  17 +-
 block/bio.c                        | 426 ++++++++++++++++++---------------------
 block/blk-core.c                   |  11 +-
 block/blk-lib.c                    |  30 ++-
 block/blk-map.c                    | 172 +++-------------
 block/blk-merge.c                  |  41 ++--
 block/blk-mq-tag.c                 |  81 +++++---
 block/blk-mq-tag.h                 |   4 +-
 block/blk-mq.c                     |  13 +-
 block/blk-tag.c                    |  33 ++-
 block/cfq-iosched.c                |  16 +-
 block/ioctl.c                      |   2 +-
 block/partitions/check.c           |  12 +-
 block/scsi_ioctl.c                 |  17 +-
 drivers/block/brd.c                |  14 +-
 drivers/block/drbd/drbd_receiver.c |   2 +-
 drivers/block/osdblk.c             |   2 +-
 drivers/md/dm.c                    |   1 +
 drivers/s390/block/dcssblk.c       |  21 +-
 drivers/scsi/scsi_lib.c            |   2 +
 drivers/scsi/scsi_scan.c           |   3 +-
 drivers/scsi/sg.c                  |  15 +-
 fs/block_dev.c                     |  40 ++++
 fs/ext2/xip.c                      |  31 ++-
 include/linux/bio.h                |  12 +-
 include/linux/blk-mq.h             |  10 +-
 include/linux/blkdev.h             |  25 ++-
 include/scsi/scsi_host.h           |   3 +
 include/scsi/scsi_tcq.h            |   3 +-
 30 files changed, 499 insertions(+), 575 deletions(-)

-- 
Jens Axboe