[PATCH 02/19] io_uring: add IORING_SETUP_URINGLET

[Hao Xu <hao.xu@linux.dev>]

From: Hao Xu <howeyxu@tencent.com>

Add a new setup flag to turn on/off uringlet mode.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
---
 include/uapi/linux/io_uring.h | 4 ++++
 io_uring/io_uring.c           | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 1463cfecb56b..68507c23b079 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -152,6 +152,10 @@ enum {
  * Only one task is allowed to submit requests
  */
 #define IORING_SETUP_SINGLE_ISSUER	(1U << 12)
+/*
+ * uringlet mode
+ */
+#define IORING_SETUP_URINGLET		(1U << 13)
 
 enum io_uring_op {
 	IORING_OP_NOP,
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index ebfdb2212ec2..5e4f5b1684dd 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3226,6 +3226,8 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
 	struct file *file;
 	int ret;
 
+	if (p->flags & IORING_SETUP_URINGLET)
+		return -EINVAL;
 	if (!entries)
 		return -EINVAL;
 	if (entries > IORING_MAX_ENTRIES) {
@@ -3400,7 +3402,7 @@ static long io_uring_setup(u32 entries, struct io_uring_params __user *params)
 			IORING_SETUP_R_DISABLED | IORING_SETUP_SUBMIT_ALL |
 			IORING_SETUP_COOP_TASKRUN | IORING_SETUP_TASKRUN_FLAG |
 			IORING_SETUP_SQE128 | IORING_SETUP_CQE32 |
-			IORING_SETUP_SINGLE_ISSUER))
+			IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_URINGLET))
 		return -EINVAL;
 
 	return io_uring_create(entries, &p, params);
-- 
2.25.1