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Subject[PATCH V3 0/4] blk-mq: refactor and fix on issue request directly
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Hi Jens

The 1st patch refactors the code of issue request directly.
It merges the blk_mq_try_issue_directly and __blk_mq_try_issue_directly
and make it handle the return value of .queue_rq itself.

The 2nd patch let the requests be inserted into hctx->dispatch when
the queue is stopped or quiesced if bypass_insert is true.

The 3rd patch make blk_mq_sched_insert_requests issue requests directly
with 'bypass_insert' false, then it needn't to handle the non-issued requests
any more.

The 4th patch ensures the hctx to be ran on its mapped cpu in issue directly
path.

V3:
- Correct the code about the case bypass_insert is true and io scheduler
attached. The request still need to be issued in case above. (1/4)
- Refactor the code to make code clearer. (1/4)
- Add the 2nd patch.
- Modify the code to adapt the new patch 1.

V2:
- Add 1st and 2nd patch

Jianchao Wang(4)
blk-mq: refactor the code of issue request directly
blk-mq: insert request without involving any io
blk-mq: issue directly with bypass_insert 'false' in
blk-mq: ensure hctx to be ran on mapped cpu when issue

block/blk-mq-sched.c | 8 ++-
block/blk-mq.c | 139 ++++++++++++++++++++++++++++++---------------------
block/blk-mq.c.rej | 60 ++++++++++++++++++++++
3 files changed, 146 insertions(+), 61 deletions(-)

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