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ee8f7fcbe6
linux/fs/ocfs2/dlm
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piaojun ee8f7fcbe6 ocfs2/dlm: continue to purge recovery lockres when recovery master goes down 
We found a dlm-blocked situation caused by continuous breakdown of
recovery masters described below.  To solve this problem, we should
purge recovery lock once detecting recovery master goes down.

N3                      N2                   N1(reco master)
                        go down
                                             pick up recovery lock and
                                             begin recoverying for N2

                                             go down

pick up recovery
lock failed, then
purge it:
dlm_purge_lockres
  ->DROPPING_REF is set

send deref to N1 failed,
recovery lock is not purged

find N1 go down, begin
recoverying for N1, but
blocked in dlm_do_recovery
as DROPPING_REF is set:
dlm_do_recovery
  ->dlm_pick_recovery_master
    ->dlmlock
      ->dlm_get_lock_resource
        ->__dlm_wait_on_lockres_flags(tmpres,
	  	DLM_LOCK_RES_DROPPING_REF);

Fixes: 8c03439681 ("ocfs2/dlm: clear DROPPING_REF flag when the master goes down")
Link: http://lkml.kernel.org/r/578453AF.8030404@huawei.com
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
Reviewed-by: Jiufei Xue <xuejiufei@huawei.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-08-02 17:31:41 -04:00
..
dlmapi.h
dlmast.c
dlmcommon.h ocfs2/dlm: continue to purge recovery lockres when recovery master goes down 2016-08-02 17:31:41 -04:00
dlmconvert.c ocfs2/dlm: move lock to the tail of grant queue while doing in-place convert 2016-03-25 16:37:42 -07:00
dlmconvert.h
dlmdebug.c ocfs2/dlm: fix memory leak of dlm_debug_ctxt 2016-07-26 16:19:19 -07:00
dlmdebug.h ocfs2/dlm: fix memory leak of dlm_debug_ctxt 2016-07-26 16:19:19 -07:00
dlmdomain.c ocfs2/dlm: fix a variable overflow problem in dlmdomain.c 2016-03-15 16:55:16 -07:00
dlmdomain.h
dlmlock.c
dlmmaster.c ocfs2/dlm: continue to purge recovery lockres when recovery master goes down 2016-08-02 17:31:41 -04:00
dlmrecovery.c ocfs2/dlm: continue to purge recovery lockres when recovery master goes down 2016-08-02 17:31:41 -04:00
dlmthread.c ocfs2/dlm: continue to purge recovery lockres when recovery master goes down 2016-08-02 17:31:41 -04:00
dlmunlock.c ocfs2/dlm: return appropriate value when dlm_grab() returns NULL 2016-01-14 16:00:49 -08:00
Makefile