[RFC PATCH 0/4] block/dm: support bio polling

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 reuses .bi_next to bio driver for storing driver data.

Patch 3 adds .bio_poll() callback to block_device_operations, so bio
driver can implement its own logic for io polling.

Patch 4 implements bio polling for device mapper.

Any comments are welcome.

[1] switch block layer polling to a bio based model v4
https://lore.kernel.org/linux-block/20210615160619.GA32435@lst.de/T/#t (local)


Ming Lei (4):
  block: add helper of blk_queue_poll
  block: add field of .bi_bio_drv_data to bio
  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           | 59 ++++++++++++++++++++++++++++++++++++---
 drivers/nvme/host/core.c  |  2 +-
 include/linux/blk_types.h | 11 +++++++-
 include/linux/blkdev.h    |  3 ++
 8 files changed, 112 insertions(+), 15 deletions(-)

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2.31.1