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authorYang Zhang <zhang.yangB@h3c.com>2018-02-01 03:14:33 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-01 04:18:35 +0300
commitfc2af28bd91561a30067c26a85776d1e457b4ad7 (patch)
treeedf1a23b5acbc3c76e90471214bcfe6c5b4d2df8 /fs/ocfs2/cluster
parenta52370b3b182f792b4de4fc4c611b829aec11953 (diff)
downloadlinux-fc2af28bd91561a30067c26a85776d1e457b4ad7.tar.xz
ocfs2/cluster: close a race that fence can't be triggered
When some nodes of cluster face with TCP connection fault, ocfs2 will pick up a quorum to continue to work and other nodes will be fenced by resetting host. In order to decide which node should be fenced, ocfs2 leverages o2quo_state::qs_holds. If that variable is reduced to zero, then a try to decide if fence local node is performed. However, under a specific scenario that local node is not disconnected from others at the same time, above method has a problem to reduce ::qs_holds to zero. Because, o2net 90s idle timer corresponding to different nodes is triggered one after another. node 2 node 3 90s idle timer elapses clear ::qs_conn_bm set hold 40s is passed 90 idle timer elapses clear ::qs_conn_bm set hold still up timer elapses clear hold (NOT to zero ) 90s idle timer elapses AGAIN still up timer elapses. clear hold still up timer elapses To solve this issue, a node which has already be evicted from ::qs_conn_bm can't set hold again and again invoked from idle timer. Link: http://lkml.kernel.org/r/63ADC13FD55D6546B7DECE290D39E373F1F3F93B@H3CMLB12-EX.srv.huawei-3com.com Signed-off-by: Yang Zhang <zhang.yangB@h3c.com> Signed-off-by: Changwei Ge <ge.changwei@h3c.com> Cc: Mark Fasheh <mfasheh@versity.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <jiangqi903@gmail.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')
-rw-r--r--fs/ocfs2/cluster/quorum.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ocfs2/cluster/quorum.c b/fs/ocfs2/cluster/quorum.c
index 62e8ec619b4c..af2e7473956e 100644
--- a/fs/ocfs2/cluster/quorum.c
+++ b/fs/ocfs2/cluster/quorum.c
@@ -314,12 +314,13 @@ void o2quo_conn_err(u8 node)
node, qs->qs_connected);
clear_bit(node, qs->qs_conn_bm);
+
+ if (test_bit(node, qs->qs_hb_bm))
+ o2quo_set_hold(qs, node);
}
mlog(0, "node %u, %d total\n", node, qs->qs_connected);
- if (test_bit(node, qs->qs_hb_bm))
- o2quo_set_hold(qs, node);
spin_unlock(&qs->qs_lock);
}