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Commit 834057bf authored by Jan Kara's avatar Jan Kara
Browse files

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: default avatarJan Kara <jack@suse.cz>
parent 503330f3

fs/quota/dquot.c

+6 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/quota.h

+3 −0
Original line number Diff line number Diff line
@@ -490,6 +490,9 @@ enum { 
						 */

#define DQUOT_NEGATIVE_USAGE	(1 << (DQUOT_STATE_LAST + 1))

					       /* Allow negative quota usage */

/* Do not track dirty dquots in a list */

#define DQUOT_NOLIST_DIRTY	(1 << (DQUOT_STATE_LAST + 2))



static inline unsigned int dquot_state_flag(unsigned int flags, int type)

{

	return flags << type;