Obviously not really useful since it's not transferring data, but it
is helpful in benchmarking overhead of provided buffers.
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
fs/io_uring.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3b61cf06275d..eb168a7c6e06 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1052,7 +1052,9 @@ struct io_op_def {
};
static const struct io_op_def io_op_defs[] = {
- [IORING_OP_NOP] = {},
+ [IORING_OP_NOP] = {
+ .buffer_select = 1,
+ },
[IORING_OP_READV] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
@@ -4910,11 +4912,20 @@ static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
static int io_nop(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ring_ctx *ctx = req->ctx;
+ void __user *buf;
if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
- __io_req_complete(req, issue_flags, 0, 0);
+ if (req->flags & REQ_F_BUFFER_SELECT) {
+ size_t len = 1;
+
+ buf = io_buffer_select(req, &len, issue_flags);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+ }
+
+ __io_req_complete(req, issue_flags, 0, io_put_kbuf(req, issue_flags));
return 0;
}
--
2.35.1
