[dm-devel] [PATCH 0/3] blk-mq/dm-rq: support BLK_MQ_F_BLOCKING for dm-rq

[Ming Lei]

Hello,

dm-rq may be built on blk-mq device which marks BLK_MQ_F_BLOCKING, so
dm_mq_queue_rq() may become to sleep current context.

Fixes the issue by allowing dm-rq to set BLK_MQ_F_BLOCKING in case that
any underlying queue is marked as BLK_MQ_F_BLOCKING.

DM request queue is allocated before allocating tagset, this way is a
bit special, so we need to pre-allocate srcu payload, then use the queue
flag of QUEUE_FLAG_BLOCKING for locking dispatch.


Ming Lei (3):
  block: split having srcu from queue blocking
  block: add blk_alloc_disk_srcu
  dm: mark dm queue as blocking if any underlying is blocking

 block/blk-core.c       |  2 +-
 block/blk-mq.c         |  6 +++---
 block/blk-mq.h         |  2 +-
 block/blk-sysfs.c      |  2 +-
 block/genhd.c          |  5 +++--
 drivers/md/dm-rq.c     |  5 ++++-
 drivers/md/dm-rq.h     |  3 ++-
 drivers/md/dm-table.c  | 14 ++++++++++++++
 drivers/md/dm.c        |  5 +++--
 drivers/md/dm.h        |  1 +
 include/linux/blkdev.h |  5 +++--
 include/linux/genhd.h  | 12 ++++++++----
 12 files changed, 44 insertions(+), 18 deletions(-)

-- 
2.31.1