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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>
This commit is contained in:
Jan Kara 2017-08-03 11:18:23 +02:00
parent 503330f382
commit 834057bf84
2 changed files with 9 additions and 0 deletions
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6
fs/quota/dquot.c
View File

@ -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);

3
include/linux/quota.h
View File

@ -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;