diff options
| author | Jan Kara <jack@suse.cz> | 2022-06-06 20:56:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-09 11:21:31 +0300 |
| commit | 0285718e28259e41f405a038ee0e6bb984fd1b34 (patch) | |
| tree | 92d623efbce9d074372d9af1b83f6466ebfcc5e1 /block/bfq-iosched.h | |
| parent | 80b0a2b3dfea5de3224ba756830b9243709c6e9e (diff) | |
| download | linux-0285718e28259e41f405a038ee0e6bb984fd1b34.tar.xz | |
bfq: Get rid of __bio_blkcg() usage
commit 4e54a2493e582361adc3bfbf06c7d50d19d18837 upstream.
BFQ usage of __bio_blkcg() is a relict from the past. Furthermore if bio
would not be associated with any blkcg, the usage of __bio_blkcg() in
BFQ is prone to races with the task being migrated between cgroups as
__bio_blkcg() calls at different places could return different blkcgs.
Convert BFQ to the new situation where bio->bi_blkg is initialized in
bio_set_dev() and thus practically always valid. This allows us to save
blkcg_gq lookup and noticeably simplify the code.
CC: stable@vger.kernel.org
Fixes: 0fe061b9f03c ("blkcg: fix ref count issue with bio_blkcg() using task_css")
Tested-by: "yukuai (C)" <yukuai3@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220401102752.8599-8-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block/bfq-iosched.h')
| -rw-r--r-- | block/bfq-iosched.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h index b116ed48d27d..2a4a6f44efff 100644 --- a/block/bfq-iosched.h +++ b/block/bfq-iosched.h @@ -984,8 +984,7 @@ void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg); void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio); void bfq_end_wr_async(struct bfq_data *bfqd); -struct bfq_group *bfq_find_set_group(struct bfq_data *bfqd, - struct blkcg *blkcg); +struct bfq_group *bfq_bio_bfqg(struct bfq_data *bfqd, struct bio *bio); struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg); struct bfq_group *bfqq_group(struct bfq_queue *bfqq); struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node); |