remove ->rq_disk

[Christoph Hellwig]

Hi Jens,

this series removes the rq_disk field in struct request, which isn't
needed now that we can get the disk from the request_queue.

Diffstat:
 block/blk-core.c                   |   10 ++++----
 block/blk-exec.c                   |   10 ++------
 block/blk-flush.c                  |    3 --
 block/blk-merge.c                  |    7 ------
 block/blk-mq.c                     |    1 
 block/blk.h                        |    2 -
 block/bsg-lib.c                    |    2 -
 drivers/block/amiflop.c            |    2 -
 drivers/block/ataflop.c            |    6 ++---
 drivers/block/floppy.c             |    6 ++---
 drivers/block/mtip32xx/mtip32xx.c  |    2 -
 drivers/block/null_blk/trace.h     |    2 -
 drivers/block/paride/pcd.c         |    2 -
 drivers/block/paride/pd.c          |    6 ++---
 drivers/block/paride/pf.c          |    4 +--
 drivers/block/pktcdvd.c            |    2 -
 drivers/block/rnbd/rnbd-clt.c      |    4 +--
 drivers/block/sunvdc.c             |    2 -
 drivers/block/sx8.c                |    4 +--
 drivers/block/virtio_blk.c         |    2 -
 drivers/md/dm-mpath.c              |    1 
 drivers/mmc/core/block.c           |   12 +++++-----
 drivers/mtd/mtd_blkdevs.c          |   10 +-------
 drivers/nvme/host/core.c           |    4 +--
 drivers/nvme/host/fault_inject.c   |    2 -
 drivers/nvme/host/pci.c            |    7 ++----
 drivers/nvme/host/trace.h          |    6 ++---
 drivers/nvme/target/passthru.c     |    3 --
 drivers/scsi/ch.c                  |    2 -
 drivers/scsi/scsi_bsg.c            |    2 -
 drivers/scsi/scsi_error.c          |    2 -
 drivers/scsi/scsi_ioctl.c          |   43 ++++++++++++++-----------------------
 drivers/scsi/scsi_lib.c            |    5 ++--
 drivers/scsi/scsi_logging.c        |    4 ++-
 drivers/scsi/sd.c                  |   26 +++++++++++-----------
 drivers/scsi/sd_zbc.c              |    8 +++---
 drivers/scsi/sg.c                  |    6 ++---
 drivers/scsi/sr.c                  |   11 ++++-----
 drivers/scsi/st.c                  |    4 +--
 drivers/scsi/ufs/ufshcd.c          |    3 --
 drivers/scsi/ufs/ufshpb.c          |    5 +---
 drivers/scsi/virtio_scsi.c         |    2 -
 drivers/target/target_core_pscsi.c |    2 -
 drivers/usb/storage/transport.c    |    2 -
 fs/nfsd/blocklayout.c              |    2 -
 include/linux/blk-mq.h             |   11 ++-------
 include/scsi/scsi_cmnd.h           |    2 -
 include/scsi/scsi_device.h         |    4 +--
 include/scsi/scsi_ioctl.h          |    4 +--
 include/trace/events/block.h       |    8 +++---
 kernel/trace/blktrace.c            |    2 -
 51 files changed, 125 insertions(+), 159 deletions(-)