aboutsummaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2018-09-06 14:01:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-09-06 14:01:15 -0700
commitca16eb342ebedbf3bb1d8450048fe428895b0b65 (patch)
tree926d774db9a92c1cc747b3cee1195566ba1955f9 /mm
parentdb44bf4b4768a0664d3c9d9000ecb747de31ded8 (diff)
parentd5274b3cd6a814ccb2f56d81ee87cbbf51bd4cf7 (diff)
downloadlinux-stericsson-ca16eb342ebedbf3bb1d8450048fe428895b0b65.tar.gz
Merge tag 'for-linus-20180906' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe: "Small collection of fixes that should go into this release. This contains: - Small series that fixes a race between blkcg teardown and writeback (Dennis Zhou) - Fix disallowing invalid block size settings from the nbd ioctl (me) - BFQ fix for a use-after-free on last release of a bfqg (Konstantin Khlebnikov) - Fix for the "don't warn for flush" fix (Mikulas)" * tag 'for-linus-20180906' of git://git.kernel.dk/linux-block: block: bfq: swap puts in bfqg_and_blkg_put block: don't warn when doing fsync on read-only devices nbd: don't allow invalid blocksize settings blkcg: use tryget logic when associating a blkg with a bio blkcg: delay blkg destruction until after writeback has finished Revert "blk-throttle: fix race between blkcg_bio_issue_check() and cgroup_rmdir()"
Diffstat (limited to 'mm')
-rw-r--r--mm/backing-dev.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index f5981e9d6ae2..8a8bb8796c6c 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -491,6 +491,7 @@ static void cgwb_release_workfn(struct work_struct *work)
{
struct bdi_writeback *wb = container_of(work, struct bdi_writeback,
release_work);
+ struct blkcg *blkcg = css_to_blkcg(wb->blkcg_css);
mutex_lock(&wb->bdi->cgwb_release_mutex);
wb_shutdown(wb);
@@ -499,6 +500,9 @@ static void cgwb_release_workfn(struct work_struct *work)
css_put(wb->blkcg_css);
mutex_unlock(&wb->bdi->cgwb_release_mutex);
+ /* triggers blkg destruction if cgwb_refcnt becomes zero */
+ blkcg_cgwb_put(blkcg);
+
fprop_local_destroy_percpu(&wb->memcg_completions);
percpu_ref_exit(&wb->refcnt);
wb_exit(wb);
@@ -597,6 +601,7 @@ static int cgwb_create(struct backing_dev_info *bdi,
list_add_tail_rcu(&wb->bdi_node, &bdi->wb_list);
list_add(&wb->memcg_node, memcg_cgwb_list);
list_add(&wb->blkcg_node, blkcg_cgwb_list);
+ blkcg_cgwb_get(blkcg);
css_get(memcg_css);
css_get(blkcg_css);
}