quota: Make quota stat accounting lockless.
Quota stats is mostly writable data structure. Let's alloc percpu
bucket for each value.
NOTE: dqstats_read() function is racy against dqstats_{inc,dec}
and may return inconsistent value. But this is ok since absolute
accuracy is not required.
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
index f81f4bc..5b7f741 100644
--- a/fs/quota/quota_tree.c
+++ b/fs/quota/quota_tree.c
@@ -384,7 +384,7 @@
} else {
ret = 0;
}
- dqstats.writes++;
+ dqstats_inc(DQST_WRITES);
kfree(ddquot);
return ret;
@@ -634,7 +634,7 @@
spin_unlock(&dq_data_lock);
kfree(ddquot);
out:
- dqstats.reads++;
+ dqstats_inc(DQST_READS);
return ret;
}
EXPORT_SYMBOL(qtree_read_dquot);