[v2,00/13] A few bugfix and cleanup patches for blk-mq

Message

Kemeng Shi Jan. 4, 2023, 2:22 p.m. UTC

Hi, this series contain several bugfix patches to fix potential io
hung and a few cleanup patches to remove stale codes and unnecessary
check. Most changes are in request issue and dispatch path. Thanks.

---
V2:
 -Thanks Christoph for review and there are two fixes in v2 according
to recommends from Christoph.
  1)Avoid overly long line in patch "blk-mq: avoid sleep in
blk_mq_alloc_request_hctx"
  2)Check BLK_MQ_REQ_NOWAIT and BLK_MQ_REQ_RESERVED in two WARN_ON_ONCE
---

Kemeng Shi (13):
  blk-mq: avoid sleep in blk_mq_alloc_request_hctx
  blk-mq: remove stale comment for blk_mq_sched_mark_restart_hctx
  blk-mq: wait on correct sbitmap_queue in blk_mq_mark_tag_wait
  blk-mq: Fix potential io hung for shared sbitmap per tagset
  blk-mq: remove unnecessary list_empty check in
    blk_mq_try_issue_list_directly
  blk-mq: remove unncessary error count and flush in
    blk_mq_plug_issue_direct
  blk-mq: remove error count and unncessary flush in
    blk_mq_try_issue_list_directly
  blk-mq: simplify flush check in blk_mq_dispatch_rq_list
  blk-mq: remove unnecessary error count and check in
    blk_mq_dispatch_rq_list
  blk-mq: remove set of bd->last when get driver tag for next request
    fails
  blk-mq: remove unncessary from_schedule parameter in
    blk_mq_plug_issue_direct
  blk-mq: use switch/case to improve readability in
    blk_mq_try_issue_list_directly
  blk-mq: correct stale comment of .get_budget

 block/blk-mq-sched.c |   7 ++-
 block/blk-mq.c       | 105 +++++++++++++++++++------------------------
 2 files changed, 48 insertions(+), 64 deletions(-)