rename ->make_request_fn and move it to the block_device_operations v2

[Christoph Hellwig]

Hi Jens,

this series moves the make_request_fn method into block_device_operations
with the much more descriptive ->submit_bio name.  It then also gives
generic_make_request a more descriptive name, and further optimize the
path to issue to blk-mq, removing the need for the direct_make_request
bypass.

Changes since v1:
 - fix a null pointer dereference when dispatching from bio to request
   based drivers
 - clean up a few more comments

Diffstat:
 Documentation/block/biodoc.rst                    |    2 
 Documentation/block/writeback_cache_control.rst   |    2 
 Documentation/fault-injection/fault-injection.rst |    2 
 Documentation/trace/ftrace.rst                    |    4 
 arch/m68k/emu/nfblock.c                           |    8 
 arch/xtensa/platforms/iss/simdisk.c               |    9 
 block/bio.c                                       |   14 -
 block/blk-cgroup.c                                |    2 
 block/blk-core.c                                  |  255 +++++++++-------------
 block/blk-crypto-fallback.c                       |    2 
 block/blk-crypto.c                                |    2 
 block/blk-merge.c                                 |   23 -
 block/blk-mq.c                                    |   12 -
 block/blk-throttle.c                              |    4 
 block/blk.h                                       |    5 
 block/bounce.c                                    |    2 
 drivers/block/brd.c                               |    5 
 drivers/block/drbd/drbd_int.h                     |    8 
 drivers/block/drbd/drbd_main.c                    |   12 -
 drivers/block/drbd/drbd_receiver.c                |    2 
 drivers/block/drbd/drbd_req.c                     |    8 
 drivers/block/drbd/drbd_worker.c                  |    2 
 drivers/block/null_blk_main.c                     |   19 +
 drivers/block/pktcdvd.c                           |   15 -
 drivers/block/ps3vram.c                           |   20 -
 drivers/block/rsxx/dev.c                          |   14 -
 drivers/block/umem.c                              |   11 
 drivers/block/zram/zram_drv.c                     |   14 -
 drivers/lightnvm/core.c                           |    8 
 drivers/lightnvm/pblk-init.c                      |   16 -
 drivers/lightnvm/pblk-read.c                      |    2 
 drivers/md/bcache/bcache.h                        |    2 
 drivers/md/bcache/btree.c                         |    2 
 drivers/md/bcache/request.c                       |   11 
 drivers/md/bcache/request.h                       |    4 
 drivers/md/bcache/super.c                         |   24 +-
 drivers/md/dm-cache-target.c                      |    6 
 drivers/md/dm-clone-target.c                      |   10 
 drivers/md/dm-crypt.c                             |    6 
 drivers/md/dm-delay.c                             |    2 
 drivers/md/dm-era-target.c                        |    2 
 drivers/md/dm-integrity.c                         |    4 
 drivers/md/dm-mpath.c                             |    2 
 drivers/md/dm-raid1.c                             |    2 
 drivers/md/dm-snap-persistent.c                   |    2 
 drivers/md/dm-snap.c                              |    6 
 drivers/md/dm-thin.c                              |    4 
 drivers/md/dm-verity-target.c                     |    2 
 drivers/md/dm-writecache.c                        |    2 
 drivers/md/dm-zoned-target.c                      |    2 
 drivers/md/dm.c                                   |   41 +--
 drivers/md/md-faulty.c                            |    4 
 drivers/md/md-linear.c                            |    4 
 drivers/md/md-multipath.c                         |    4 
 drivers/md/md.c                                   |    7 
 drivers/md/raid0.c                                |    8 
 drivers/md/raid1.c                                |   14 -
 drivers/md/raid10.c                               |   28 +-
 drivers/md/raid5.c                                |   10 
 drivers/nvdimm/blk.c                              |    5 
 drivers/nvdimm/btt.c                              |    5 
 drivers/nvdimm/pmem.c                             |    5 
 drivers/nvme/host/core.c                          |    1 
 drivers/nvme/host/multipath.c                     |   18 -
 drivers/nvme/host/nvme.h                          |    1 
 drivers/s390/block/dcssblk.c                      |   11 
 drivers/s390/block/xpram.c                        |    8 
 fs/buffer.c                                       |    5 
 include/linux/blk-mq.h                            |    2 
 include/linux/blkdev.h                            |   12 -
 include/linux/lightnvm.h                          |    3 
 71 files changed, 387 insertions(+), 408 deletions(-)