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Commit eabf290d authored by Dmitry Monakhov's avatar Dmitry Monakhov Committed by Jan Kara
Browse files

quota: optimize mark_dirty logic 



- Skip locking if quota is dirty already.
- Return old quota state to help fs-specciffic implementation to optimize
  case where quota was dirty already.

Signed-off-by: default avatarDmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 46891532

fs/quota/dquot.c

+11 −2
Original line number Diff line number Diff line
@@ -317,14 +317,23 @@ static inline int mark_dquot_dirty(struct dquot *dquot) 
	return dquot->dq_sb->dq_op->mark_dirty(dquot);

}



/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */

int dquot_mark_dquot_dirty(struct dquot *dquot)

{

	int ret = 1;



	/* If quota is dirty already, we don't have to acquire dq_list_lock */

	if (test_bit(DQ_MOD_B, &dquot->dq_flags))

		return 1;



	spin_lock(&dq_list_lock);

	if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))

	if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {

		list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->

				info[dquot->dq_type].dqi_dirty_list);

		ret = 0;

	}

	spin_unlock(&dq_list_lock);

	return 0;

	return ret;

}

EXPORT_SYMBOL(dquot_mark_dquot_dirty);