use block_device based APIs in block layer consumers

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Hi Jens,

this series cleanups up the block layer API so that APIs consumed
by file systems are (almost) only struct block_devic based, so that
file systems don't have to poke into block layer internals like the
request_queue.

I also found a bunch of existing bugs related to partition offsets
and discard so these are fixed while going along.

Diffstat:
 arch/um/drivers/ubd_kern.c           |    2 
 block/blk-core.c                     |    4 -
 block/blk-lib.c                      |  124 ++++++++++++++++++++---------------
 block/blk-mq-debugfs.c               |    2 
 block/blk-settings.c                 |   74 ++++++++++++++++++++
 block/blk.h                          |   14 ---
 block/fops.c                         |    2 
 block/genhd.c                        |    4 -
 block/ioctl.c                        |   48 ++++++++++---
 block/partitions/core.c              |   12 ---
 drivers/block/drbd/drbd_main.c       |   53 +++++++-------
 drivers/block/drbd/drbd_nl.c         |   94 +++++++++++---------------
 drivers/block/drbd/drbd_receiver.c   |   13 +--
 drivers/block/loop.c                 |   15 +---
 drivers/block/nbd.c                  |    3 
 drivers/block/null_blk/main.c        |    1 
 drivers/block/rbd.c                  |    1 
 drivers/block/rnbd/rnbd-clt.c        |    6 -
 drivers/block/rnbd/rnbd-srv-dev.h    |    8 --
 drivers/block/rnbd/rnbd-srv.c        |    5 -
 drivers/block/virtio_blk.c           |    2 
 drivers/block/xen-blkback/blkback.c  |   15 ++--
 drivers/block/xen-blkback/xenbus.c   |    9 --
 drivers/block/xen-blkfront.c         |    7 -
 drivers/block/zram/zram_drv.c        |    1 
 drivers/md/bcache/alloc.c            |    2 
 drivers/md/bcache/request.c          |    4 -
 drivers/md/bcache/super.c            |    3 
 drivers/md/bcache/sysfs.c            |    2 
 drivers/md/dm-cache-target.c         |    9 --
 drivers/md/dm-clone-target.c         |    9 --
 drivers/md/dm-io.c                   |    2 
 drivers/md/dm-log-writes.c           |    3 
 drivers/md/dm-raid.c                 |    9 --
 drivers/md/dm-table.c                |   25 +------
 drivers/md/dm-thin.c                 |   15 ----
 drivers/md/dm.c                      |    3 
 drivers/md/md-linear.c               |   11 ---
 drivers/md/md.c                      |    5 -
 drivers/md/raid0.c                   |    7 -
 drivers/md/raid1.c                   |   18 -----
 drivers/md/raid10.c                  |   20 -----
 drivers/md/raid5-cache.c             |    8 +-
 drivers/md/raid5.c                   |   14 +--
 drivers/mmc/core/queue.c             |    3 
 drivers/mtd/mtd_blkdevs.c            |    1 
 drivers/nvme/host/core.c             |    6 -
 drivers/nvme/target/io-cmd-bdev.c    |    2 
 drivers/nvme/target/zns.c            |    3 
 drivers/s390/block/dasd_fba.c        |    1 
 drivers/scsi/sd.c                    |    2 
 drivers/target/target_core_device.c  |   19 ++---
 drivers/target/target_core_file.c    |   10 +-
 drivers/target/target_core_iblock.c  |   17 +---
 fs/btrfs/disk-io.c                   |    3 
 fs/btrfs/extent-tree.c               |    8 +-
 fs/btrfs/ioctl.c                     |   12 +--
 fs/btrfs/volumes.c                   |    4 -
 fs/btrfs/zoned.c                     |    3 
 fs/direct-io.c                       |   32 +--------
 fs/exfat/file.c                      |    5 -
 fs/exfat/super.c                     |   10 --
 fs/ext4/ioctl.c                      |   10 --
 fs/ext4/mballoc.c                    |   10 +-
 fs/ext4/super.c                      |   10 --
 fs/f2fs/f2fs.h                       |    3 
 fs/f2fs/file.c                       |   19 ++---
 fs/f2fs/segment.c                    |    8 --
 fs/fat/file.c                        |    5 -
 fs/fat/inode.c                       |   10 --
 fs/gfs2/rgrp.c                       |    7 -
 fs/iomap/direct-io.c                 |    3 
 fs/jbd2/journal.c                    |    9 --
 fs/jfs/ioctl.c                       |    5 -
 fs/jfs/super.c                       |    8 --
 fs/nilfs2/ioctl.c                    |    6 -
 fs/nilfs2/sufile.c                   |    4 -
 fs/nilfs2/the_nilfs.c                |    4 -
 fs/ntfs3/file.c                      |    6 -
 fs/ntfs3/super.c                     |   10 +-
 fs/ocfs2/ioctl.c                     |    5 -
 fs/super.c                           |    2 
 fs/xfs/xfs_discard.c                 |    8 +-
 fs/xfs/xfs_log_cil.c                 |    2 
 fs/xfs/xfs_super.c                   |   12 +--
 fs/zonefs/super.c                    |    3 
 include/linux/blkdev.h               |  112 +++++++++++--------------------
 include/target/target_core_backend.h |    4 -
 mm/swapfile.c                        |   31 ++------
 89 files changed, 493 insertions(+), 652 deletions(-)



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