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>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
index f81f4bcfb178..5b7f7416ec7a 100644
--- a/fs/quota/quota_tree.c
+++ b/fs/quota/quota_tree.c
@@ -384,7 +384,7 @@ int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
         } else {
                 ret = 0;
         }
-        dqstats.writes++;
+        dqstats_inc(DQST_WRITES);
         kfree(ddquot);
 
         return ret;
@@ -634,7 +634,7 @@ int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
         spin_unlock(&dq_data_lock);
         kfree(ddquot);
 out:
-        dqstats.reads++;
+        dqstats_inc(DQST_READS);
         return ret;
 }
 EXPORT_SYMBOL(qtree_read_dquot);