[PATCH RFC v3 00/15] block: fix disordered IO in the case recursive split

[Yu Kuai <yukuai1@huaweicloud.com>]

From: Yu Kuai <yukuai3@huawei.com>

Changes in v3:
 - add patch 1,2 to cleanup bio_issue;
 - add patch 3,4 to fix missing processing for split bio first;
 - bypass zoned device in patch 14;
Changes in v2:
 - export a new helper bio_submit_split_bioset() instead of
export bio_submit_split() directly;
 - don't set no merge flag in the new helper;
 - add patch 7 and patch 10;
 - add patch 8 to skip bio checks for resubmitting split bio;

patch 1,2 cleanup bio_issue;
patch 3,4 to fix missing processing for split bio;
patch 5 export a bio split helper;
patch 6-12 unify bio split code;
path 13,14 convert the helper to insert split bio to the head of current
bio list;
patch 15 is a follow cleanup for raid0;

This set is just test for raid5 for now, see details in patch 9;

Yu Kuai (15):
  block: cleanup bio_issue
  block: add QUEUE_FLAG_BIO_ISSUE
  md: fix mssing blktrace bio split events
  blk-crypto: fix missing processing for split bio
  block: factor out a helper bio_submit_split_bioset()
  md/raid0: convert raid0_handle_discard() to use
    bio_submit_split_bioset()
  md/raid1: convert to use bio_submit_split_bioset()
  md/raid10: add a new r10bio flag R10BIO_Returned
  md/raid10: convert read/write to use bio_submit_split_bioset()
  md/raid5: convert to use bio_submit_split_bioset()
  md/md-linear: convert to use bio_submit_split_bioset()
  blk-crypto: convert to use bio_submit_split_bioset()
  block: skip unnecessary checks for split bio
  block: fix disordered IO in the case recursive split
  md/raid0: convert raid0_make_request() to use
    bio_submit_split_bioset()

 block/bio.c                 |  2 +-
 block/blk-cgroup.h          |  5 ++-
 block/blk-core.c            | 35 +++++++++++++++++----
 block/blk-crypto-fallback.c | 15 +++------
 block/blk-iolatency.c       | 15 +++------
 block/blk-merge.c           | 63 ++++++++++++++++++++++++-------------
 block/blk-mq-debugfs.c      |  1 +
 block/blk-throttle.c        |  2 +-
 block/blk.h                 | 45 ++------------------------
 drivers/md/md-linear.c      | 11 ++-----
 drivers/md/raid0.c          | 30 ++++++------------
 drivers/md/raid1.c          | 38 ++++++++--------------
 drivers/md/raid1.h          |  4 ++-
 drivers/md/raid10.c         | 54 ++++++++++++++-----------------
 drivers/md/raid10.h         |  2 ++
 drivers/md/raid5.c          | 10 +++---
 include/linux/blk_types.h   |  7 ++---
 include/linux/blkdev.h      |  3 ++
 18 files changed, 152 insertions(+), 190 deletions(-)

-- 
2.39.2