Revert "io_uring: add buffer selection support to IORING_OP_NOP"

This reverts commit 3d200242a6c968af321913b635fc4014b238cba4.

Buffer selection with nops was used for debugging and benchmarking but
is useless in real life. Let's revert it before it's released.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c5012098ca6b51dfbdcb190f8c4e3c0bf1c965dc.1655224415.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index bf556f7..1b95c67 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1114,7 +1114,6 @@ static const struct io_op_def io_op_defs[] = {
        [IORING_OP_NOP] = {
                .audit_skip             = 1,
                .iopoll                 = 1,
-               .buffer_select          = 1,
        },
        [IORING_OP_READV] = {
                .needs_file             = 1,
@@ -5269,19 +5268,7 @@ static int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
  */
 static int io_nop(struct io_kiocb *req, unsigned int issue_flags)
 {
-       unsigned int cflags;
-       void __user *buf;
-
-       if (req->flags & REQ_F_BUFFER_SELECT) {
-               size_t len = 1;
-
-               buf = io_buffer_select(req, &len, issue_flags);
-               if (!buf)
-                       return -ENOBUFS;
-       }
-
-       cflags = io_put_kbuf(req, issue_flags);
-       __io_req_complete(req, issue_flags, 0, cflags);
+       __io_req_complete(req, issue_flags, 0, 0);
        return 0;
 }