quota: Allow disabling tracking of dirty dquots in a list
Filesystems that are journalling quotas generally don't need tracking of
dirty dquots in a list since forcing a transaction commit flushes all
quotas anyway. Allow filesystem to say it doesn't want dquots to be
tracked as it reduces contention on the dq_list_lock.
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 361a2a6..b867578 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -344,6 +344,9 @@ int dquot_mark_dquot_dirty(struct dquot *dquot)
if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
return 0;
+ if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY)
+ return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags);
+
/* 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;
@@ -385,6 +388,9 @@ static inline void dqput_all(struct dquot **dquot)
static inline int clear_dquot_dirty(struct dquot *dquot)
{
+ if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY)
+ return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags);
+
spin_lock(&dq_list_lock);
if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) {
spin_unlock(&dq_list_lock);