ocfs2/dlm: Do not purge lockres that is being migrated dlm_purge_lockres()
This patch attempts to fix a fine race between purging and migration. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
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@ -162,12 +162,28 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm,
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spin_lock(&res->spinlock);
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spin_lock(&res->spinlock);
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if (!__dlm_lockres_unused(res)) {
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if (!__dlm_lockres_unused(res)) {
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spin_unlock(&res->spinlock);
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mlog(0, "%s:%.*s: tried to purge but not unused\n",
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mlog(0, "%s:%.*s: tried to purge but not unused\n",
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dlm->name, res->lockname.len, res->lockname.name);
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dlm->name, res->lockname.len, res->lockname.name);
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return -ENOTEMPTY;
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__dlm_print_one_lock_resource(res);
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spin_unlock(&res->spinlock);
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BUG();
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}
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}
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if (res->state & DLM_LOCK_RES_MIGRATING) {
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mlog(0, "%s:%.*s: Delay dropref as this lockres is "
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"being remastered\n", dlm->name, res->lockname.len,
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res->lockname.name);
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/* Re-add the lockres to the end of the purge list */
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if (!list_empty(&res->purge)) {
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list_del_init(&res->purge);
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list_add_tail(&res->purge, &dlm->purge_list);
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}
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spin_unlock(&res->spinlock);
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return 0;
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}
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master = (res->owner == dlm->node_num);
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master = (res->owner == dlm->node_num);
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if (!master)
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if (!master)
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res->state |= DLM_LOCK_RES_DROPPING_REF;
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res->state |= DLM_LOCK_RES_DROPPING_REF;
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spin_unlock(&res->spinlock);
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spin_unlock(&res->spinlock);
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