[RFC,V2,0/3] block/dm: support bio polling

Message

Ming Lei June 17, 2021, 10:35 a.m. UTC

Hello Guys,

Based on Christoph's bio based polling model[1], implement DM bio polling
with one very simple approach.

Patch 1 adds helper of blk_queue_poll().

Patch 2 adds .bio_poll() callback to block_device_operations, so bio
driver can implement its own logic for io polling.

Patch 3 implements bio polling for device mapper.

Any comments are welcome.

V2:
	- drop patch to add new fields into bio
	- support io polling for dm native bio splitting
	- add comment

Ming Lei (3):
  block: add helper of blk_queue_poll
  block: add ->poll_bio to block_device_operations
  dm: support bio polling

 block/blk-core.c         |  21 +++++---
 block/blk-sysfs.c        |   4 +-
 block/genhd.c            |   3 ++
 drivers/md/dm-table.c    |  24 +++++++++
 drivers/md/dm.c          | 111 +++++++++++++++++++++++++++++++++++++--
 drivers/nvme/host/core.c |   2 +-
 include/linux/blkdev.h   |   3 ++
 7 files changed, 155 insertions(+), 13 deletions(-)