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authorJeff Layton <jlayton@kernel.org>2021-07-27 15:47:12 -0400
committerIlya Dryomov <idryomov@gmail.com>2021-09-02 22:49:17 +0200
commitb4002173b7989588b6feaefc42edaf011b596782 (patch)
treee078e38dc658473974fb44b862d2c284fd6b45ae /fs/ceph
parent40e309de4dd84ba91b9e0549a5173ce13ef02c5e (diff)
ceph: cancel delayed work instead of flushing on mdsc teardown
The first thing metric_delayed_work does is check mdsc->stopping, and then return immediately if it's set. That's good since we would have already torn down the metric structures at this point, otherwise, but there is no locking around mdsc->stopping. It's possible that the ceph_metric_destroy call could race with the delayed_work, in which case we could end up with the delayed_work accessing destroyed percpu variables. At this point in the mdsc teardown, the "stopping" flag has already been set, so there's no benefit to flushing the work. Move the work cancellation in ceph_metric_destroy ahead of the percpu variable destruction, and eliminate the flush_delayed_work call in ceph_mdsc_destroy. Fixes: 18f473b384a6 ("ceph: periodically send perf metrics to MDSes") Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Xiubo Li <xiubli@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/mds_client.c1
-rw-r--r--fs/ceph/metric.c4
2 files changed, 2 insertions, 3 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index d98a3eda0d4c..85934091e024 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -4954,7 +4954,6 @@ void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
ceph_metric_destroy(&mdsc->metric);
- flush_delayed_work(&mdsc->metric.delayed_work);
fsc->mdsc = NULL;
kfree(mdsc);
dout("mdsc_destroy %p done\n", mdsc);
diff --git a/fs/ceph/metric.c b/fs/ceph/metric.c
index 5ac151eb0d49..04d5df29bbbf 100644
--- a/fs/ceph/metric.c
+++ b/fs/ceph/metric.c
@@ -302,6 +302,8 @@ void ceph_metric_destroy(struct ceph_client_metric *m)
if (!m)
return;
+ cancel_delayed_work_sync(&m->delayed_work);
+
percpu_counter_destroy(&m->total_inodes);
percpu_counter_destroy(&m->opened_inodes);
percpu_counter_destroy(&m->i_caps_mis);
@@ -309,8 +311,6 @@ void ceph_metric_destroy(struct ceph_client_metric *m)
percpu_counter_destroy(&m->d_lease_mis);
percpu_counter_destroy(&m->d_lease_hit);
- cancel_delayed_work_sync(&m->delayed_work);
-
ceph_put_mds_session(m->session);
}