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| author | Joseph Qi <joseph.qi@huawei.com> | 2014-10-09 15:25:13 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-09 22:25:47 -0400 |
| commit | 70e82a12dbfa3acbff41be08a36e8be4578878c9 (patch) | |
| tree | 2f5462c4d1ded93f1710d8c0d83ae67473402a87 /fs/ocfs2/cluster/heartbeat.h | |
| parent | 5046f18d5bd9ad7638b32c3b304ff39a74c064df (diff) | |
| download | linux-70e82a12dbfa3acbff41be08a36e8be4578878c9.tar.gz | |
ocfs2: fix deadlock between o2hb thread and o2net_wq
The following case may lead to o2net_wq and o2hb thread deadlock on
o2hb_callback_sem.
Currently there are 2 nodes say N1, N2 in the cluster. And N2 down, at
the same time, N3 tries to join the cluster. So N1 will handle node
down (N2) and join (N3) simultaneously.
o2hb o2net_wq
->o2hb_do_disk_heartbeat
->o2hb_check_slot
->o2hb_run_event_list
->o2hb_fire_callbacks
->down_write(&o2hb_callback_sem)
->o2net_hb_node_down_cb
->flush_workqueue(o2net_wq)
->o2net_process_message
->dlm_query_join_handler
->o2hb_check_node_heartbeating
->o2hb_fill_node_map
->down_read(&o2hb_callback_sem)
No need to take o2hb_callback_sem in dlm_query_join_handler,
o2hb_live_lock is enough to protect live node map.
Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: xMark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: jiangyiwen <jiangyiwen@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2/cluster/heartbeat.h')
| -rw-r--r-- | fs/ocfs2/cluster/heartbeat.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ocfs2/cluster/heartbeat.h b/fs/ocfs2/cluster/heartbeat.h index 00ad8e8fea510e..3ef5137dc36220 100644 --- a/fs/ocfs2/cluster/heartbeat.h +++ b/fs/ocfs2/cluster/heartbeat.h @@ -80,6 +80,7 @@ void o2hb_fill_node_map(unsigned long *map, void o2hb_exit(void); int o2hb_init(void); int o2hb_check_node_heartbeating(u8 node_num); +int o2hb_check_node_heartbeating_no_sem(u8 node_num); int o2hb_check_node_heartbeating_from_callback(u8 node_num); int o2hb_check_local_node_heartbeating(void); void o2hb_stop_all_regions(void); |