quota: fix livelock in dquot_writeback_dquots (6ff33d99) · Commits · 戴 / test

fs/quota/dquot.c

+5 −4

Original line number	Diff line number	Diff line
		@@ -622,7 +622,7 @@ EXPORT_SYMBOL(dquot_scan_active);
		/* Write all dquot structures to quota files */
		int dquot_writeback_dquots(struct super_block *sb, int type)
		{
		struct list_head *dirty;
		struct list_head dirty;
		struct dquot *dquot;
		struct quota_info *dqopt = sb_dqopt(sb);
		int cnt;
		@@ -636,9 +636,10 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
		if (!sb_has_quota_active(sb, cnt))
		continue;
		spin_lock(&dq_list_lock);
		dirty = &dqopt->info[cnt].dqi_dirty_list;
		while (!list_empty(dirty)) {
		dquot = list_first_entry(dirty, struct dquot,
		/* Move list away to avoid livelock. */
		list_replace_init(&dqopt->info[cnt].dqi_dirty_list, &dirty);
		while (!list_empty(&dirty)) {
		dquot = list_first_entry(&dirty, struct dquot,
		dq_dirty);

		WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));