linux-kernel - [PATCH 00/10] blk-cgroup: don't use queue

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Message-Id: <20250925081525.700639-1-yukuai1@huaweicloud.com>
Date: Thu, 25 Sep 2025 16:15:15 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: tj@...nel.org,
	ming.lei@...hat.com,
	nilay@...ux.ibm.com,
	hch@....de,
	josef@...icpanda.com,
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Cc: cgroups@...r.kernel.org,
	linux-block@...r.kernel.org,
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	yukuai3@...wei.com,
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	johnny.chenyi@...wei.com
Subject: [PATCH 00/10] blk-cgroup: don't use queue_lock for protection and fix deadlock

From: Yu Kuai <yukuai3@...wei.com>

patch 1-6 is prep patches to make sure queue_lock is not nested under
rcu and other spinlocks in blk-cgroup;
patch 7 convert blk-cgroup to use blkcg_mutex to protect blkgs;
patch 8-9 are follow cleanups;
patch 10 fix deadlock in blk-throttle;

BTW, with this set, we can unify blkg_conf_prep() and other related
helpers.

Yu Kuai (10):
  blk-cgroup: use cgroup lock and rcu to protect iterating blkcg blkgs
  blk-cgroup: don't nest queue_lock under rcu in blkg_lookup_create()
  blk-cgroup: don't nest queu_lock under rcu in bio_associate_blkg()
  blk-cgroup: don't nest queue_lock under blkcg->lock in
    blkcg_destroy_blkgs()
  mm/page_io: don't nest queue_lock under rcu in
    bio_associate_blkg_from_page()
  block, bfq: don't grab queue_lock to initialize bfq
  blk-cgroup: convert to protect blkgs with blkcg_mutex
  blk-cgroup: remove radix_tree_preload()
  blk-cgroup: remove preallocate blkg for blkg_create()
  blk-throttle: fix possible deadlock due to queue_lock in timer

 block/bfq-cgroup.c        |   6 +-
 block/bfq-iosched.c       |  13 +-
 block/blk-cgroup-rwstat.c |   2 -
 block/blk-cgroup.c        | 329 ++++++++++++++++----------------------
 block/blk-cgroup.h        |   6 +-
 block/blk-throttle.c      |  31 ++--
 mm/page_io.c              |   7 +-
 7 files changed, 163 insertions(+), 231 deletions(-)

-- 
2.39.2