Re: [PATCH 0/8] blk-cgroup: remove queue_lock nesting from blkcg paths

[Jens Axboe]

On Mon, 08 Jun 2026 11:42:41 +0800, Yu Kuai wrote:
> This series is the follow-up blk-cgroup locking cleanup on top of the
> earlier blkg-list protection fixes, and prepares blk-cgroup to stop using
> q->queue_lock as the global blkg lifetime/iteration lock.
> 
> The current queue_lock based protection is hard to maintain because
> queue_lock is used from hardirq and softirq completion paths, while some
> blkcg cgroup file paths also need to iterate blkgs, print policy data, or
> create blkgs from RCU-protected contexts.  This series first tightens the
> blkcg-side lifetime rules:
> 
> [...]

Applied, thanks!

[1/8] blk-cgroup: protect iterating blkgs with blkcg->lock in blkcg_print_stat()
      commit: 25656304dabd26198ec69460c594a19d086ef099
[2/8] blk-cgroup: delay freeing policy data after rcu grace period
      commit: 0af3fedb8c8ed3c07b4f76927bd7fc88f6f82efb
[3/8] blk-cgroup: don't nest queue_lock under rcu in blkcg_print_blkgs()
      commit: 56cc24f59c145ce6938959f792df04b8a4f5a4d8
[4/8] blk-cgroup: don't nest queue_lock under rcu in blkg_lookup_create()
      commit: 9327a865e395a53f67dffac4710beb1d4730495e
[5/8] blk-cgroup: don't nest queue_lock under rcu in bio_associate_blkg()
      commit: 457d3c4f0fdd6cf8a4bd8115bf470809984a9f02
[6/8] blk-cgroup: don't nest queue_lock under blkcg->lock in blkcg_destroy_blkgs()
      commit: 4cfd7c1cff8f4c863b99d420cdbe0563802a9e80
[7/8] mm/page_io: don't nest queue_lock under rcu in bio_associate_blkg_from_page()
      commit: f928145cbcb52544203808f159461d0a25543df7
[8/8] block, bfq: don't grab queue_lock to initialize bfq
      commit: 3ca4f4e3ae811d414076a491cbf0dfcdae0dc01e

Best regards,
-- 
Jens Axboe