f2fs: quota: decrease the lock granularity of statfs_project

According to fs/quota/dquot.c, `dq_data_lock' protects mem_dqinfo
structures and modifications of dquot pointers in the inode, and
`dquot->dq_dqb_lock' protects data from dq_dqb.

We should use dquot->dq_dqb_lock in statfs_project instead of
dq_dat_lock.

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 609ea87..bdea570 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1117,7 +1117,7 @@ static int f2fs_statfs_project(struct super_block *sb,
        dquot = dqget(sb, qid);
        if (IS_ERR(dquot))
                return PTR_ERR(dquot);
-       spin_lock(&dq_data_lock);
+       spin_lock(&dquot->dq_dqb_lock);
 
        limit = (dquot->dq_dqb.dqb_bsoftlimit ?
                 dquot->dq_dqb.dqb_bsoftlimit :
@@ -1140,7 +1140,7 @@ static int f2fs_statfs_project(struct super_block *sb,
                         (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
        }
 
-       spin_unlock(&dq_data_lock);
+       spin_unlock(&dquot->dq_dqb_lock);
        dqput(dquot);
        return 0;
 }