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Joseph Qi 70e82a12db 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>		10 years ago
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Makefile	…
dlmapi.h	…
dlmast.c	…
dlmcommon.h	…
dlmconvert.c	…
dlmconvert.h	…
dlmdebug.c	…
dlmdebug.h	…
dlmdomain.c	ocfs2: fix deadlock between o2hb thread and o2net_wq	10 years ago
dlmdomain.h	…
dlmlock.c	…
dlmmaster.c	…
dlmrecovery.c	…
dlmthread.c	…
dlmunlock.c	…