untangle the block headers

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Hi Jens,

this series untangles the worst of the block header maze.  It removes
various includes from blkdev.h and genhd.h, and also ensures the
writeback code doesn't pull in blkdev.h leading to huge rebuilds
whenever they change.  Finally it moves various bits out of blkdev.h
which shouldn't be in the general block layer header.

It has surived various randomconfig builds from me and the buildbot,
but I suspect there are a few more conditionally missing headers
that will emerge later for more oscure configs, so it would be great
to get this out early.

Diffstat:
 arch/mips/rb532/prom.c                     |    1 
 arch/mips/sibyte/common/cfe.c              |    1 
 arch/mips/sibyte/swarm/setup.c             |    1 
 arch/openrisc/mm/init.c                    |    1 
 arch/um/drivers/ubd_kern.c                 |    1 
 block/bdev.c                               |    1 
 block/bfq-cgroup.c                         |    2 
 block/bfq-iosched.c                        |    2 
 block/bio-integrity.c                      |    2 
 block/blk-core.c                           |    1 
 block/blk-crypto-fallback.c                |    1 
 block/blk-crypto-internal.h                |    2 
 block/blk-integrity.c                      |    2 
 block/blk-iolatency.c                      |    1 
 block/blk-merge.c                          |   25 
 block/blk-mq-sched.h                       |    1 
 block/blk-mq-tag.h                         |    2 
 block/blk-mq.c                             |    2 
 block/blk.h                                |   40 +
 block/bounce.c                             |    1 
 block/elevator.c                           |    2 
 block/elevator.h                           |   21 
 block/genhd.c                              |    1 
 block/holder.c                             |    1 
 block/keyslot-manager.c                    |    1 
 block/kyber-iosched.c                      |    2 
 block/mq-deadline.c                        |    2 
 block/partitions/core.c                    |    1 
 block/t10-pi.c                             |    2 
 drivers/block/amiflop.c                    |    2 
 drivers/block/ataflop.c                    |    1 
 drivers/block/floppy.c                     |    1 
 drivers/block/rnbd/rnbd-proto.h            |    2 
 drivers/block/swim.c                       |    1 
 drivers/block/xen-blkfront.c               |    1 
 drivers/gpu/drm/i915/i915_utils.h          |    1 
 drivers/md/dm-bio-record.h                 |    1 
 drivers/md/dm-crypt.c                      |    1 
 drivers/md/dm-ps-historical-service-time.c |    1 
 drivers/md/dm-rq.c                         |    1 
 drivers/md/dm-table.c                      |    1 
 drivers/md/dm-verity-target.c              |    1 
 drivers/md/md.c                            |    2 
 drivers/mmc/core/sd.c                      |    1 
 drivers/mtd/mtdsuper.c                     |    1 
 drivers/nvdimm/core.c                      |    1 
 drivers/nvme/host/core.c                   |    1 
 drivers/nvme/host/pci.c                    |    1 
 drivers/nvme/host/rdma.c                   |    1 
 drivers/nvme/target/io-cmd-bdev.c          |    1 
 drivers/nvme/target/rdma.c                 |    1 
 drivers/s390/block/dasd_genhd.c            |    1 
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c     |    1 
 drivers/scsi/lpfc/lpfc.h                   |    1 
 drivers/scsi/scsi_lib.c                    |    1 
 drivers/scsi/sd.c                          |    1 
 drivers/scsi/sd_dif.c                      |    2 
 drivers/scsi/sg.c                          |    1 
 drivers/scsi/sr.c                          |    1 
 drivers/scsi/st.c                          |    1 
 drivers/scsi/virtio_scsi.c                 |    1 
 drivers/target/target_core_file.c          |    1 
 drivers/target/target_core_iblock.c        |    2 
 fs/btrfs/compression.c                     |    1 
 fs/btrfs/ctree.c                           |    1 
 fs/btrfs/inode.c                           |    1 
 fs/f2fs/compress.c                         |    1 
 fs/ntfs/file.c                             |    1 
 fs/ntfs3/file.c                            |    1 
 fs/orangefs/inode.c                        |    2 
 fs/orangefs/super.c                        |    1 
 fs/quota/quota.c                           |    1 
 fs/ramfs/inode.c                           |    1 
 include/linux/backing-dev.h                |   19 
 include/linux/blk-integrity.h              |  183 +++++++
 include/linux/blk-mq.h                     |  465 ++++++++++++++++++
 include/linux/blk_types.h                  |    2 
 include/linux/blkdev.h                     |  743 -----------------------------
 include/linux/blktrace_api.h               |    2 
 include/linux/genhd.h                      |   14 
 include/linux/part_stat.h                  |    1 
 include/linux/t10-pi.h                     |    2 
 include/linux/writeback.h                  |   14 
 include/scsi/scsi_device.h                 |    2 
 init/main.c                                |    1 
 kernel/acct.c                              |    1 
 kernel/exit.c                              |    1 
 kernel/fork.c                              |    1 
 kernel/sched/core.c                        |    2 
 kernel/sched/sched.h                       |    1 
 lib/random32.c                             |    1 
 mm/backing-dev.c                           |   19 
 mm/filemap.c                               |    1 
 mm/highmem.c                               |    1 
 mm/mempool.c                               |    1 
 mm/nommu.c                                 |    1 
 mm/readahead.c                             |    1 
 mm/shmem.c                                 |    1 
 mm/swapfile.c                              |    2 
 99 files changed, 830 insertions(+), 825 deletions(-)



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