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authorSunil Mushran <sunil.mushran@oracle.com>2007-03-22 17:01:07 -0700
committerMark Fasheh <mark.fasheh@oracle.com>2007-03-26 16:50:52 -0700
commit78062cb2e54ffe0df811dce5e68b54da9b8c9025 (patch)
treed360f3440fbe3489ef1c467f0b4b8ef196516ec2 /fs/ocfs2
parente0f2e3a06be513352cb4955313ed7e55909acd84 (diff)
ocfs2_dlm: Fix lockres ref counting bug
During umount, the umount thread migrates the lockres' and the dlm_thread frees the empty lockres'. Due to a race, the reference counting on the lockres goes awry leading to extra puts. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/dlm/dlmdomain.c6
-rw-r--r--fs/ocfs2/dlm/dlmthread.c10
2 files changed, 6 insertions, 10 deletions
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 6087c4749fe..dbbac184c26 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -138,8 +138,10 @@ static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
void __dlm_unhash_lockres(struct dlm_lock_resource *lockres)
{
- hlist_del_init(&lockres->hash_node);
- dlm_lockres_put(lockres);
+ if (!hlist_unhashed(&lockres->hash_node)) {
+ hlist_del_init(&lockres->hash_node);
+ dlm_lockres_put(lockres);
+ }
}
void __dlm_insert_lockres(struct dlm_ctxt *dlm,
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 6421a8fae1d..2b264c6ba03 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -256,20 +256,14 @@ static void dlm_run_purge_list(struct dlm_ctxt *dlm,
break;
}
- mlog(0, "removing lockres %.*s:%p from purgelist\n",
- lockres->lockname.len, lockres->lockname.name, lockres);
- list_del_init(&lockres->purge);
- dlm_lockres_put(lockres);
- dlm->purge_count--;
+ dlm_lockres_get(lockres);
/* This may drop and reacquire the dlm spinlock if it
* has to do migration. */
- mlog(0, "calling dlm_purge_lockres!\n");
- dlm_lockres_get(lockres);
if (dlm_purge_lockres(dlm, lockres))
BUG();
+
dlm_lockres_put(lockres);
- mlog(0, "DONE calling dlm_purge_lockres!\n");
/* Avoid adding any scheduling latencies */
cond_resched_lock(&dlm->spinlock);