[PATCH v7 0/9] bugfix and cleanup for blk-throttle

[Yu Kuai <yukuai1@huaweicloud.com>]

From: Yu Kuai <yukuai3@huawei.com>

Changes in v7:
 - add patch 5 to improve handling of re-entered bio for bps limit
 - as suggested by Tejun, add some comments
 - sdd some Acked tag by Tejun
Changes in v6:
 - rename parameter in patch 3
 - add comments and reviewed tag for patch 4
Changes in v5:
 - add comments in patch 4
 - clear bytes/io_skipped in throtl_start_new_slice_with_credit() in
 patch 4
 - and cleanup patches 5-8
Changes in v4:
 - add reviewed-by tag for patch 1
 - add patch 2,3
 - use a different way to fix io hung in patch 4
Changes in v3:
 - fix a check in patch 1
 - fix link err in patch 2 on 32-bit platform
 - handle overflow in patch 2
Changes in v2:
 - use a new solution suggested by Ming
 - change the title of patch 1
 - add patch 2

Patch 1 fix that blk-throttle can't work if multiple bios are throttle.
Patch 2 fix overflow while calculating wait time.
Patch 3,4 fix io hung due to configuration updates.
Patch 5 improve handling of re-entered bio for bps limit.
Patch 6-9 are cleanup patches, there are no functional changes, just
some places that I think can be optimized during code review.

Previous version:
v1: https://lore.kernel.org/all/20220517134909.2910251-1-yukuai3@huawei.com/
v2: https://lore.kernel.org/all/20220518072751.1188163-1-yukuai3@huawei.com/
v3: https://lore.kernel.org/all/20220519085811.879097-1-yukuai3@huawei.com/
v4: https://lore.kernel.org/all/20220523082633.2324980-1-yukuai3@huawei.com/
v5: https://lore.kernel.org/all/20220528064330.3471000-1-yukuai3@huawei.com/
v6: https://lore.kernel.org/all/20220701093441.885741-1-yukuai1@huaweicloud.com/

Yu Kuai (9):
  blk-throttle: fix that io throttle can only work for single bio
  blk-throttle: prevent overflow while calculating wait time
  blk-throttle: factor out code to calculate ios/bytes_allowed
  blk-throttle: fix io hung due to configuration updates
  blk-throttle: improve handling of re-entered bio for bps limit
  blk-throttle: use 'READ/WRITE' instead of '0/1'
  blk-throttle: calling throtl_dequeue/enqueue_tg in pairs
  blk-throttle: cleanup tg_update_disptime()
  blk-throttle: clean up flag 'THROTL_TG_PENDING'

 block/blk-throttle.c | 175 ++++++++++++++++++++++++++++++-------------
 block/blk-throttle.h |  20 ++++-
 2 files changed, 139 insertions(+), 56 deletions(-)

-- 
2.31.1