blkcg: use tryget logic when associating a blkg with a bio

There is a very small change a bio gets caught up in a really
unfortunate race between a task migration, cgroup exiting, and itself
trying to associate with a blkg. This is due to css offlining being
performed after the css->refcnt is killed which triggers removal of
blkgs that reach their blkg->refcnt of 0.

To avoid this, association with a blkg should use tryget and fallback to
using the root_blkg.

Fixes: 08e18eab0c579 ("block: add bi_blkg to the bio for cgroups")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennisszhou@gmail.com>
Cc: Jiufei Xue <jiufei.xue@linux.alibaba.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index b12966e..8c680a7 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -2015,7 +2015,8 @@ int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg)
 {
        if (unlikely(bio->bi_blkg))
                return -EBUSY;
-       blkg_get(blkg);
+       if (!blkg_try_get(blkg))
+               return -ENODEV;
        bio->bi_blkg = blkg;
        return 0;
 }

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index a3eede0..01d0620 100644 (file)
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2129,8 +2129,9 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td)
 static void blk_throtl_assoc_bio(struct throtl_grp *tg, struct bio *bio)
 {
 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
-       if (bio->bi_css)
-               bio_associate_blkg(bio, tg_to_blkg(tg));
+       /* fallback to root_blkg if we fail to get a blkg ref */
+       if (bio->bi_css && (bio_associate_blkg(bio, tg_to_blkg(tg)) == -ENODEV))
+               bio_associate_blkg(bio, bio->bi_disk->queue->root_blkg);
        bio_issue_init(&bio->bi_issue, bio_sectors(bio));
 #endif
 }