[dm-devel] [PATCH 0/8] dm: changes staged in linux-next for 5.1 so far

[Mike Snitzer]

I seized on Mikulas's noclone patches and took it upon myself to add
noclone support to bio-based dm-multipath.  Pretty happy with how
things turned out but also open to all review/feedback.

I've verified that all mptest tests pass (with tcmloop, mptest's
nvmefcloop based test setup panics with 5.0-rc6.. I should probably
report and/or fix that).

I've yet to do the before vs after multipath benchmarking to see if
there is a performance win but I'm betting there will be (otherwise I
wouldn't have done this work).  I'll backfill benchmarking results
later in the week.

Mike Snitzer (6):
  dm: update dm_process_bio() to split bio if in ->make_request_fn()
  dm: eliminate 'split_discard_bios' flag from DM target interface
  dm: improve noclone bio support
  dm: add the ability to attach per-bio-data to dm_noclone bio
  dm: improve noclone_endio() to support multipath target
  dm mpath: add support for dm_noclone and its per-bio-data

Mikulas Patocka (2):
  dm: refactor start_io_acct and end_io_acct
  dm: implement noclone optimization for bio-based

 drivers/md/dm-cache-target.c  |   1 -
 drivers/md/dm-core.h          |   1 +
 drivers/md/dm-linear.c        |   1 +
 drivers/md/dm-mpath.c         |  65 ++++++--
 drivers/md/dm-raid.c          |  14 +-
 drivers/md/dm-stripe.c        |   1 +
 drivers/md/dm-table.c         |  11 ++
 drivers/md/dm-thin.c          |   1 -
 drivers/md/dm-zero.c          |   1 +
 drivers/md/dm-zoned-target.c  |   1 -
 drivers/md/dm.c               | 357 +++++++++++++++++++++++++++++-------------
 drivers/md/dm.h               |   1 +
 include/linux/device-mapper.h |  22 ++-
 13 files changed, 346 insertions(+), 131 deletions(-)

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2.15.0