[5.20,v2,0/3] block/dm: add bio_rewind to improve DM requeue

Message

Mike Snitzer June 29, 2022, 9:55 p.m. UTC

Hi,

This v2 is the by-product of my having picked up v1's patch 2+3 and
folding them (into patch 1 of this v2 series). So patch 1 of this v2
is settled and will be merged into 5.20.

Patches 2 and 3 are the result of me having gone over the v1 code. I
folded in the copy-n-paste bugfix that Eric Biggers kindly pointed out
in v1. I also updated patch headers and code comments for clarity. And
I also renamed some variables, tweaked some style knits (subjective
but whatever).

This code is available in linux-dm.git's 'dm-5.20' branch:
https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-5.20
Which is based on Jens's for-5.20/block

I'll obviously rebase 'dm-5.20' ontop of Jens's branch if/when he
picks up patch 2 in this series.

This code is passing all my tests so far but testing is ongoing.

All comments welcome.

ps. I was told Kent had replied to the v1 thread while I was working
on this v2, I kept focus on finishing this v2. I'll check my email in
a bit.

Ming Lei (3):
  dm: improve BLK_STS_DM_REQUEUE and BLK_STS_AGAIN handling
  block: add bio_rewind() API
  dm: add two stage requeue mechanism

 block/bio-integrity.c       |  19 +++++
 block/bio.c                 |  20 +++++
 block/blk-crypto-internal.h |   7 ++
 block/blk-crypto.c          |  25 ++++++
 drivers/md/dm-core.h        |  11 ++-
 drivers/md/dm.c             | 189 ++++++++++++++++++++++++++++++++++----------
 include/linux/bio.h         |  21 +++++
 include/linux/bvec.h        |  33 ++++++++
 8 files changed, 281 insertions(+), 44 deletions(-)