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authorpiaojun <piaojun@huawei.com>2016-08-02 14:02:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-02 17:31:41 -0400
commit309e91911daede6adde0364f489e69909c3f6894 (patch)
tree287184133ed121eba278f5acedb57e62d1576e22 /fs/ocfs2/dlm/dlmthread.c
parent86b652b93adb57d8fed8edd532ed2eb8a791950d (diff)
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@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>
Diffstat (limited to 'fs/ocfs2/dlm/dlmthread.c')
-rw-r--r--fs/ocfs2/dlm/dlmthread.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 68d239ba0c63..ce397229acc0 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -175,6 +175,15 @@ static void dlm_purge_lockres(struct dlm_ctxt *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_ctxt *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;