When journalling quotas, we writeback all dquots immediately after
changing them as part of current transation. Thus there's no need to
write anything in dquot_writeback_dquots() and so we can avoid updating
list of dirty dquots to reduce dq_list_lock contention.
This change reduces time to create 500000 files on ext4 on ramdisk by 50
different processes in separate directories by 15% when user quota is
turned on.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/ext4/super.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4c168b90903c..16a877a0f309 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5404,6 +5404,13 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
ext4_msg(sb, KERN_WARNING,
"Quota file not on filesystem root. "
"Journaled quota will not work");
+ sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
+ } else {
+ /*
+ * Clear the flag just in case mount options changed since
+ * last time.
+ */
+ sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
}
/*
@@ -5500,7 +5507,7 @@ static int ext4_enable_quotas(struct super_block *sb)
test_opt(sb, PRJQUOTA),
};
- sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
+ sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
for (type = 0; type < EXT4_MAXQUOTAS; type++) {
if (qf_inums[type]) {
err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
--
2.12.3
