[Ocfs2-devel] [patch 4/5] ocfs2/dlm: solve a BUG when deref failed in dlm_drop_lockres_ref

[akpm at linux-foundation.org <akpm@linux-foundation.org>]

From: piaojun <piaojun@huawei.com>
Subject: ocfs2/dlm: solve a BUG when deref failed in dlm_drop_lockres_ref

We found a BUG situation that lockres is migrated during deref described
below.  To solve the BUG, we could purge lockres directly when other node
says I did not have a ref.  Additionally, we'd better purge lockres if
master goes down, as no one will response deref done.

Node 1                  Node 2(old master)             Node3(new master)
dlm_purge_lockres
send deref to N2

                        leave domain
                        migrate lockres to N3
                                                       finish migration
                                                       send do assert
                                                       master to N1

receive do assert msg
form N3, but can not
find lockres because
DROPPING_REF is set,
so the owner is still
N2.

                        receive deref from N1
                        and response -EINVAL
                        because lockres is migrated

BUG when receive -EINVAL
in dlm_drop_lockres_ref

Fixes: 842b90b62461d ("ocfs2/dlm: return in progress if master can not clear the refmap bit right now")

Link: http://lkml.kernel.org/r/57845103.3070406 at 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>
Cc: 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>
---

 fs/ocfs2/dlm/dlmmaster.c |    9 ++++++---
 fs/ocfs2/dlm/dlmthread.c |   13 +++++++++++--
 2 files changed, 17 insertions(+), 5 deletions(-)

diff -puN fs/ocfs2/dlm/dlmmaster.c~ocfs2-dlm-solve-a-bug-when-deref-failed-in-dlm_drop_lockres_ref fs/ocfs2/dlm/dlmmaster.c
--- a/fs/ocfs2/dlm/dlmmaster.c~ocfs2-dlm-solve-a-bug-when-deref-failed-in-dlm_drop_lockres_ref
+++ a/fs/ocfs2/dlm/dlmmaster.c
@@ -2276,9 +2276,12 @@ int dlm_drop_lockres_ref(struct dlm_ctxt
 		mlog(ML_ERROR, "%s: res %.*s, DEREF to node %u got %d\n",
 		     dlm->name, namelen, lockname, res->owner, r);
 		dlm_print_one_lock_resource(res);
-		BUG();
-	}
-	return ret ? ret : r;
+		if (r == -ENOMEM)
+			BUG();
+	} else
+		ret = r;
+
+	return ret;
 }
 
 int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
diff -puN fs/ocfs2/dlm/dlmthread.c~ocfs2-dlm-solve-a-bug-when-deref-failed-in-dlm_drop_lockres_ref fs/ocfs2/dlm/dlmthread.c
--- a/fs/ocfs2/dlm/dlmthread.c~ocfs2-dlm-solve-a-bug-when-deref-failed-in-dlm_drop_lockres_ref
+++ a/fs/ocfs2/dlm/dlmthread.c
@@ -175,6 +175,15 @@ static void dlm_purge_lockres(struct dlm
 	     res->lockname.len, res->lockname.name, master);
 
 	if (!master) {
+		if (res->state & DLM_LOCK_RES_DROPPING_REF) {
+			mlog(ML_NOTICE, "%s: res %.*s already in "
+				"DLM_LOCK_RES_DROPPING_REF state\n",
+				dlm->name, res->lockname.len,
+				res->lockname.name);
+			spin_unlock(&res->spinlock);
+			return;
+		}
+
 		res->state |= DLM_LOCK_RES_DROPPING_REF;
 		/* drop spinlock...  retake below */
 		spin_unlock(&res->spinlock);
@@ -203,8 +212,8 @@ static void dlm_purge_lockres(struct dlm
 		dlm->purge_count--;
 	}
 
-	if (!master && ret != 0) {
-		mlog(0, "%s: deref %.*s in progress or master goes down\n",
+	if (!master && ret == DLM_DEREF_RESPONSE_INPROG) {
+		mlog(0, "%s: deref %.*s in progress\n",
 			dlm->name, res->lockname.len, res->lockname.name);
 		spin_unlock(&res->spinlock);
 		return;
_