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_v1.c b/fs/quota/quota_v1.c
index 2ae757e9c008..4af344c5852a 100644
--- a/fs/quota/quota_v1.c
+++ b/fs/quota/quota_v1.c
@@ -71,7 +71,7 @@ static int v1_read_dqblk(struct dquot *dquot)
             dquot->dq_dqb.dqb_ihardlimit == 0 &&
             dquot->dq_dqb.dqb_isoftlimit == 0)
                 set_bit(DQ_FAKE_B, &dquot->dq_flags);
-        dqstats.reads++;
+        dqstats_inc(DQST_READS);
 
         return 0;
 }
@@ -104,7 +104,7 @@ static int v1_commit_dqblk(struct dquot *dquot)
         ret = 0;
 
 out:
-        dqstats.writes++;
+        dqstats_inc(DQST_WRITES);
 
         return ret;
 }