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ocfs2: add spinlock protection when dealing with lockres->purge.

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when we check/modify lockres->purge, we should with the protection of lockres->spinlock.
in dlm_purge_lockres(), the checking/modifying is not with the protectin.
this patch fixes it.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Wengang Wang 2009-09-03 15:56:33 +08:00 committed by Joel Becker
parent d92bc5127b
commit 83e32d9044
1 changed files with 5 additions and 1 deletions
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6
fs/ocfs2/dlm/dlmthread.c
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@ -212,14 +212,18 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm,
spin_lock(&dlm->spinlock);
}
spin_lock(&res->spinlock);
if (!list_empty(&res->purge)) {
mlog(0, "removing lockres %.*s:%p from purgelist, "
"master = %d\n", res->lockname.len, res->lockname.name,
res, master);
list_del_init(&res->purge);
spin_unlock(&res->spinlock);
dlm_lockres_put(res);
dlm->purge_count--;
}
} else
spin_unlock(&res->spinlock);
__dlm_unhash_lockres(res);
/* lockres is not in the hash now. drop the flag and wake up