1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 6965fe394c3b..1d3eee594cd6 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -46,6 +46,14 @@ void inode_reclaim_rsv_space(struct inode *inode, qsize_t number);
 void dquot_initialize(struct inode *inode);
 void dquot_drop(struct inode *inode);
 struct dquot *dqget(struct super_block *sb, struct kqid qid);
+static inline struct dquot *dqgrab(struct dquot *dquot)
+{
+        /* Make sure someone else has active reference to dquot */
+        WARN_ON_ONCE(!atomic_read(&dquot->dq_count));
+        WARN_ON_ONCE(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
+        atomic_inc(&dquot->dq_count);
+        return dquot;
+}
 void dqput(struct dquot *dquot);
 int dquot_scan_active(struct super_block *sb,
                       int (*fn)(struct dquot *dquot, unsigned long priv),