[Drbd-dev] remove REQ_OP_WRITE_SAME v2

[Christoph Hellwig]

Now that we are using REQ_OP_WRITE_ZEROES for all zeroing needs in the
kernel there is very little use left for REQ_OP_WRITE_SAME.  We only
have two callers left, and both just export optional protocol features
to remote systems: DRBD and the target code.

For the target code the only real use case was zeroing offload, which
is kept with this series, and for DRBD I suspect the same based on the
usage.

    git://git.infradead.org/users/hch/block.git delete-write-same

Gitweb:

    http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/delete-write-same

Changes since v2:
 - split up
 - rebased ontop of five years of kernel change, including the totally
   pointless addition of REQ_OP_WRITE_SAME in rnbd

Changes from RFC:
 - add zeroing offload for the SCSI target.

Diffstat:
 block/blk-core.c                   |   13 -----
 block/blk-lib.c                    |   91 -------------------------------------
 block/blk-merge.c                  |   40 ----------------
 block/blk-settings.c               |   16 ------
 block/blk-sysfs.c                  |    8 ---
 block/blk-zoned.c                  |    1 
 block/blk.h                        |    1 
 block/bounce.c                     |    3 -
 drivers/block/drbd/drbd_main.c     |   31 +-----------
 drivers/block/drbd/drbd_nl.c       |   72 -----------------------------
 drivers/block/drbd/drbd_receiver.c |   47 ++-----------------
 drivers/block/drbd/drbd_req.c      |    1 
 drivers/block/drbd/drbd_worker.c   |    5 --
 drivers/block/rnbd/rnbd-clt.c      |    7 --
 drivers/block/rnbd/rnbd-clt.h      |    1 
 drivers/block/rnbd/rnbd-proto.h    |    6 --
 drivers/block/rnbd/rnbd-srv.c      |    3 -
 drivers/md/dm-core.h               |    1 
 drivers/md/dm-crypt.c              |    1 
 drivers/md/dm-ebs-target.c         |    1 
 drivers/md/dm-io.c                 |   22 --------
 drivers/md/dm-linear.c             |    1 
 drivers/md/dm-mpath.c              |    1 
 drivers/md/dm-rq.c                 |    3 -
 drivers/md/dm-stripe.c             |    4 -
 drivers/md/dm-table.c              |   29 -----------
 drivers/md/dm-zone.c               |    4 -
 drivers/md/dm.c                    |   15 ------
 drivers/md/md-linear.c             |    1 
 drivers/md/md-multipath.c          |    1 
 drivers/md/md.h                    |    7 --
 drivers/md/raid0.c                 |    2 
 drivers/md/raid1.c                 |    4 -
 drivers/md/raid10.c                |    1 
 drivers/md/raid5.c                 |    1 
 drivers/scsi/cxlflash/vlun.c       |    4 -
 drivers/scsi/sd.c                  |   75 ++----------------------------
 drivers/scsi/sd_zbc.c              |    2 
 include/linux/bio.h                |    3 -
 include/linux/blk_types.h          |    2 
 include/linux/blkdev.h             |   19 -------
 include/linux/device-mapper.h      |    6 --
 kernel/trace/blktrace.c            |    1 
 43 files changed, 30 insertions(+), 527 deletions(-)