blk-cgroup: don't nest queue_lock under rcu in blkg_lookup_create()

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Change this in two steps:

1) hold rcu lock and do blkg_lookup() from fast path;
2) hold queue_lock directly from slow path, and don't nest it under rcu
   lock;

Prepare to convert protecting blkcg with blkcg_mutex instead of
queue_lock.

Signed-off-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/93f33cc9e5a39dddb78dcd934d0c1d04b564fb00.1780621988.git.yukuai@fygo.io
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Yu Kuai 2026-06-08 11:42:45 +08:00 • committed by Jens Axboe

parent 56cc24f59c

commit 9327a865e3

1 changed files with 36 additions and 21 deletions

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block/blk-cgroup.c

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