add a helper to merge two wq_lists, it will be useful in the next
patches.
Signed-off-by: Hao Xu <haoxu@xxxxxxxxxxxxxxxxx>
---
fs/io-wq.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/fs/io-wq.h b/fs/io-wq.h
index 41bf37674a49..3709b7c5ec98 100644
--- a/fs/io-wq.h
+++ b/fs/io-wq.h
@@ -52,6 +52,28 @@ static inline void wq_list_add_after(struct io_wq_work_node *node,
list->last = node;
}
+/**
+ * wq_list_merge - merge the second list to the first one.
+ * @list0: the first list
+ * @list1: the second list
+ * Return the first node after mergence.
+ */
+static inline struct io_wq_work_node *wq_list_merge(struct io_wq_work_list *list0,
+ struct io_wq_work_list *list1)
+{
+ struct io_wq_work_node *ret;
+
+ if (!list0->first) {
+ ret = list1->first;
+ } else {
+ ret = list0->first;
+ list0->last->next = list1->first;
+ }
+ INIT_WQ_LIST(list0);
+ INIT_WQ_LIST(list1);
+ return ret;
+}
+
static inline void wq_list_add_tail(struct io_wq_work_node *node,
struct io_wq_work_list *list)
{
--
2.24.4
