diff options
| author |   Dennis Zhou <dennis@kernel.org> | 2018-10-20 14:56:12 -0400 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2018-10-20 15:39:55 -0600 |
| commit | d459d853c2edc793135e4bfa4e345c758f1cc859 (patch) | |
| tree | bef29425e5ddb78a788cca764e926b4f5601f473 /include/linux/bio.h | |
| parent | blkcg: fix edge case for blk_get_rl() under memory pressure (diff) | |
| download | linux-dev-d459d853c2edc793135e4bfa4e345c758f1cc859.tar.xz linux-dev-d459d853c2edc793135e4bfa4e345c758f1cc859.zip | |
blkcg: reassociate bios when make_request() is called recursively
When submitting a bio, multiple recursive calls to make_request() may
occur. This causes the initial associate done in blkcg_bio_issue_check()
to be incorrect and reference the prior request_queue. This introduces
a helper to do reassociation when make_request() is recursively called.
Fixes: a7b39b4e961c ("blkcg: always associate a bio with a blkg")
Reported-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Tested-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/bio.h')
| -rw-r--r-- | include/linux/bio.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index f447b0ebb288..b47c7f716731 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -514,6 +514,7 @@ int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg); int bio_associate_blkg_from_css(struct bio *bio, struct cgroup_subsys_state *css); int bio_associate_create_blkg(struct request_queue *q, struct bio *bio); +int bio_reassociate_blkg(struct request_queue *q, struct bio *bio); void bio_disassociate_task(struct bio *bio); void bio_clone_blkg_association(struct bio *dst, struct bio *src); #else /* CONFIG_BLK_CGROUP */ @@ -522,6 +523,8 @@ static inline int bio_associate_blkg_from_css(struct bio *bio, { return 0; } static inline int bio_associate_create_blkg(struct request_queue *q, struct bio *bio) { return 0; } +static inline int bio_reassociate_blkg(struct request_queue *q, struct bio *bio) +{ return 0; } static inline void bio_disassociate_task(struct bio *bio) { } static inline void bio_clone_blkg_association(struct bio *dst, struct bio *src) { } |