linux/fs/ocfs2/dlm
Wengang Wang a524812b7e ocfs2/dlm: avoid incorrect bit set in refmap on recovery master
In the following situation, there remains an incorrect bit in refmap on the
recovery master. Finally the recovery master will fail at purging the lockres
due to the incorrect bit in refmap.

1) node A has no interest on lockres A any longer, so it is purging it.
2) the owner of lockres A is node B, so node A is sending de-ref message
to node B.
3) at this time, node B crashed. node C becomes the recovery master. it recovers
lockres A(because the master is the dead node B).
4) node A migrated lockres A to node C with a refbit there.
5) node A failed to send de-ref message to node B because it crashed. The failure
is ignored. no other action is done for lockres A any more.

For mormal, re-send the deref message to it to recovery master can fix it. Well,
ignoring the failure of deref to the original master and not recovering the lockres
to recovery master has the same effect. And the later is simpler.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Acked-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-08-07 10:49:41 -07:00
..
dlmapi.h ocfs2/trivial: Remove trailing whitespaces 2010-01-25 19:20:51 -08:00
dlmast.c Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 2010-05-21 07:20:17 -07:00
dlmcommon.h ocfs2:dlm: avoid dlm->ast_lock lockres->spinlock dependency break 2010-05-18 16:41:34 -07:00
dlmconvert.c Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 2010-05-21 07:20:17 -07:00
dlmconvert.h [PATCH] OCFS2: The Second Oracle Cluster Filesystem 2006-01-03 11:45:47 -08:00
dlmdebug.c ocfs2/dlm: Fix printing of lockname 2010-02-08 13:01:31 -08:00
dlmdebug.h [PATCH 2/3] ocfs2/dlm: Silence build warnings 2008-05-30 15:15:10 -07:00
dlmdomain.c ocfs2: tighten up strlen() checking 2010-07-12 13:57:53 -07:00
dlmdomain.h [PATCH] OCFS2: The Second Oracle Cluster Filesystem 2006-01-03 11:45:47 -08:00
dlmlock.c fs/ocfs2/dlm: Drop memory allocation cast 2010-05-18 12:31:10 -07:00
dlmmaster.c ocfs2/dlm: fix a dead lock 2010-08-07 10:44:20 -07:00
dlmrecovery.c ocfs2/dlm: avoid incorrect bit set in refmap on recovery master 2010-08-07 10:49:41 -07:00
dlmthread.c ocfs2/dlm: avoid incorrect bit set in refmap on recovery master 2010-08-07 10:49:41 -07:00
dlmunlock.c Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2 2010-05-21 07:20:17 -07:00
dlmver.c ocfs2: bump version number 2008-01-25 15:05:46 -08:00
dlmver.h [PATCH] OCFS2: The Second Oracle Cluster Filesystem 2006-01-03 11:45:47 -08:00
Makefile ocfs2_dlmfs: Move to its own directory 2010-02-26 15:41:14 -08:00