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linux-sg2042/fs/ocfs2/dlm
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Joseph Qi e6f0c6e617 ocfs2/dlm: fix race between convert and migration 
Commit ac7cf246df ("ocfs2/dlm: fix race between convert and recovery")
checks if lockres master has changed to identify whether new master has
finished recovery or not.  This will introduce a race that right after
old master does umount ( means master will change), a new convert
request comes.

In this case, it will reset lockres state to DLM_RECOVERING and then
retry convert, and then fail with lockres->l_action being set to
OCFS2_AST_INVALID, which will cause inconsistent lock level between
ocfs2 and dlm, and then finally BUG.

Since dlm recovery will clear lock->convert_pending in
dlm_move_lockres_to_recovery_list, we can use it to correctly identify
the race case between convert and recovery.  So fix it.

Fixes: ac7cf246df ("ocfs2/dlm: fix race between convert and recovery")
Link: http://lkml.kernel.org/r/57CE1569.8010704@huawei.com
Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Jun Piao <piaojun@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2016-09-19 15:36:16 -07:00
..
Makefile ocfs2: remove versioning information 2014-01-21 16:19:41 -08:00
dlmapi.h ocfs2/trivial: Remove trailing whitespaces 2010-01-25 19:20:51 -08:00
dlmast.c o2dlm: fix NULL pointer dereference in o2dlm_blocking_ast_wrapper 2015-02-10 14:30:30 -08:00
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: fix race between convert and migration 2016-09-19 15:36:16 -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 qstr: constify instances in ocfs2 2016-07-20 23:30:06 -04:00
dlmdomain.h ocfs2: dlm: dlmdomain: remove unused function 2015-02-10 14:30:29 -08:00
dlmlock.c ocfs2: remove NULL assignments on static 2014-06-04 16:53:53 -07:00
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