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.


V3:
	- patch style change as suggested by Christoph(2/3)
	- fix kernel panic issue caused by nested dm polling, which is found
	  & figured out by Jeffle Xu (3/3)
	- re-organize setup polling code (3/3)
	- remove RFC

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         |  18 +++---
 block/blk-sysfs.c        |   4 +-
 block/genhd.c            |   2 +
 drivers/md/dm-table.c    |  24 +++++++
 drivers/md/dm.c          | 131 ++++++++++++++++++++++++++++++++++++++-
 drivers/nvme/host/core.c |   2 +-
 include/linux/blkdev.h   |   2 +
 7 files changed, 170 insertions(+), 13 deletions(-)

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2.31.1