[PATCH 1/3] io_uring: add data structure for graph sqe feature

[Hao Xu <haoxu@linux.alibaba.com>]

Add basic data structure for graph sqe feature.

Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
---
 fs/io_uring.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index d86372664f9f..e96d38d268a8 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -326,8 +326,25 @@ struct io_submit_state {
 	struct blk_plug		plug;
 };
 
+struct io_graph_child_node {
+	struct io_graph_node		*to;
+	struct io_graph_child_node	*next;
+};
+
+struct io_graph_node {
+	struct io_kiocb			*req;
+	struct io_graph_child_node	*children;
+	atomic_t			refs;
+};
+
+struct io_graph_info {
+	int				nr_nodes;
+	int				pos;
+	struct io_graph_node		**graph_array;
+};
+
 struct io_ring_ctx {
-	/* const or read-mostly hot data */
+	/* cons t or read-mostly hot data */
 	struct {
 		struct percpu_ref	refs;
 
@@ -459,6 +476,7 @@ struct io_ring_ctx {
 		u32				iowq_limits[2];
 		bool				iowq_limits_set;
 	};
+	struct io_graph_info			graph_info;
 };
 
 struct io_uring_task {
-- 
2.25.1