1 files changed, 63 insertions, 4 deletions

diff --git a/io_uring/nop.c b/io_uring/nop.c
index d956599a3c1b..5e5196df650a 100644
--- a/io_uring/nop.c
+++ b/io_uring/nop.c
@@ -8,18 +8,77 @@
 #include <uapi/linux/io_uring.h>
 
 #include "io_uring.h"
+#include "rsrc.h"
 #include "nop.h"
 
+struct io_nop {
+	/* NOTE: kiocb has the file as the first member, so don't do it here */
+	struct file     *file;
+	int             result;
+	int		fd;
+	int		buffer;
+	unsigned int	flags;
+};
+
+#define NOP_FLAGS	(IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \
+			 IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE)
+
 int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
+	struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
+
+	nop->flags = READ_ONCE(sqe->nop_flags);
+	if (nop->flags & ~NOP_FLAGS)
+		return -EINVAL;
+
+	if (nop->flags & IORING_NOP_INJECT_RESULT)
+		nop->result = READ_ONCE(sqe->len);
+	else
+		nop->result = 0;
+	if (nop->flags & IORING_NOP_FILE)
+		nop->fd = READ_ONCE(sqe->fd);
+	else
+		nop->fd = -1;
+	if (nop->flags & IORING_NOP_FIXED_BUFFER)
+		nop->buffer = READ_ONCE(sqe->buf_index);
+	else
+		nop->buffer = -1;
 	return 0;
 }
 
-/*
- * IORING_OP_NOP just posts a completion event, nothing else.
- */
 int io_nop(struct io_kiocb *req, unsigned int issue_flags)
 {
-	io_req_set_res(req, 0, 0);
+	struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
+	int ret = nop->result;
+
+	if (nop->flags & IORING_NOP_FILE) {
+		if (nop->flags & IORING_NOP_FIXED_FILE) {
+			req->file = io_file_get_fixed(req, nop->fd, issue_flags);
+			req->flags |= REQ_F_FIXED_FILE;
+		} else {
+			req->file = io_file_get_normal(req, nop->fd);
+		}
+		if (!req->file) {
+			ret = -EBADF;
+			goto done;
+		}
+	}
+	if (nop->flags & IORING_NOP_FIXED_BUFFER) {
+		struct io_ring_ctx *ctx = req->ctx;
+		struct io_rsrc_node *node;
+
+		ret = -EFAULT;
+		io_ring_submit_lock(ctx, issue_flags);
+		node = io_rsrc_node_lookup(&ctx->buf_table, nop->buffer);
+		if (node) {
+			io_req_assign_buf_node(req, node);
+			ret = 0;
+		}
+		io_ring_submit_unlock(ctx, issue_flags);
+	}
+done:
+	if (ret < 0)
+		req_set_fail(req);
+	io_req_set_res(req, nop->result, 0);
 	return IOU_OK;
 }