Merge tag 'io_uring-6.0-2022-09-09' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - Removed function that became unused after last week's merge (Jiapeng)

 - Two small fixes for kbuf recycling (Pavel)

 - Include address copy for zc send for POLLFIRST (Pavel)

 - Fix for short IO handling in the normal read/write path (Pavel)

* tag 'io_uring-6.0-2022-09-09' of git://git.kernel.dk/linux-block:
  io_uring/rw: fix short rw error handling
  io_uring/net: copy addr for zc on POLL_FIRST
  io_uring: recycle kbuf recycle on tw requeue
  io_uring/kbuf: fix not advancing READV kbuf ring
  io_uring/notif: Remove the unused function io_notif_complete()

Author: torvalds

io_uring/io_uring.c

@@ -1728,6 +1728,7 @@ static void io_queue_async(struct io_kiocb *req, int ret)
 
 	switch (io_arm_poll_handler(req, 0)) {
 	case IO_APOLL_READY:
+		io_kbuf_recycle(req, 0);
 		io_req_task_queue(req);
 		break;
 	case IO_APOLL_ABORTED:

io_uring/kbuf.h

@@ -91,9 +91,13 @@ static inline void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags)
 	 * buffer data. However if that buffer is recycled the original request
 	 * data stored in addr is lost. Therefore forbid recycling for now.
 	 */
-	if (req->opcode == IORING_OP_READV)
+	if (req->opcode == IORING_OP_READV) {
+		if ((req->flags & REQ_F_BUFFER_RING) && req->buf_list) {
+			req->buf_list->head++;
+			req->buf_list = NULL;
+		}
 		return;
-
+	}
 	if (req->flags & REQ_F_BUFFER_SELECTED)
 		io_kbuf_recycle_legacy(req, issue_flags);
 	if (req->flags & REQ_F_BUFFER_RING)

io_uring/net.c

@@ -1003,9 +1003,6 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
 	unsigned msg_flags, cflags;
 	int ret, min_ret = 0;
 
-	if (!(req->flags & REQ_F_POLLED) &&
-	    (zc->flags & IORING_RECVSEND_POLL_FIRST))
-		return -EAGAIN;
 	sock = sock_from_file(req->file);
 	if (unlikely(!sock))
 		return -ENOTSOCK;
@@ -1030,6 +1027,10 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
 		msg.msg_namelen = zc->addr_len;
 	}
 
+	if (!(req->flags & REQ_F_POLLED) &&
+	    (zc->flags & IORING_RECVSEND_POLL_FIRST))
+		return io_setup_async_addr(req, addr, issue_flags);
+
 	if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
 		ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu,
 					(u64)(uintptr_t)zc->buf, zc->len);

io_uring/notif.c

@@ -21,14 +21,6 @@ static void __io_notif_complete_tw(struct io_kiocb *notif, bool *locked)
 	io_req_task_complete(notif, locked);
 }
 
-static inline void io_notif_complete(struct io_kiocb *notif)
-	__must_hold(&notif->ctx->uring_lock)
-{
-	bool locked = true;
-
-	__io_notif_complete_tw(notif, &locked);
-}
-
 static void io_uring_tx_zerocopy_callback(struct sk_buff *skb,
 					  struct ubuf_info *uarg,
 					  bool success)

io_uring/rw.c

@@ -206,14 +206,28 @@ static bool __io_complete_rw_common(struct io_kiocb *req, long res)
 	return false;
 }
 
+static inline unsigned io_fixup_rw_res(struct io_kiocb *req, unsigned res)
+{
+	struct io_async_rw *io = req->async_data;
+
+	/* add previously done IO, if any */
+	if (req_has_async_data(req) && io->bytes_done > 0) {
+		if (res < 0)
+			res = io->bytes_done;
+		else
+			res += io->bytes_done;
+	}
+	return res;
+}
+
 static void io_complete_rw(struct kiocb *kiocb, long res)
 {
 	struct io_rw *rw = container_of(kiocb, struct io_rw, kiocb);
 	struct io_kiocb *req = cmd_to_io_kiocb(rw);
 
 	if (__io_complete_rw_common(req, res))
 		return;
-	io_req_set_res(req, res, 0);
+	io_req_set_res(req, io_fixup_rw_res(req, res), 0);
 	req->io_task_work.func = io_req_task_complete;
 	io_req_task_work_add(req);
 }
@@ -240,22 +254,14 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res)
 static int kiocb_done(struct io_kiocb *req, ssize_t ret,
 		       unsigned int issue_flags)
 {
-	struct io_async_rw *io = req->async_data;
 	struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw);
-
-	/* add previously done IO, if any */
-	if (req_has_async_data(req) && io->bytes_done > 0) {
-		if (ret < 0)
-			ret = io->bytes_done;
-		else
-			ret += io->bytes_done;
-	}
+	unsigned final_ret = io_fixup_rw_res(req, ret);
 
 	if (req->flags & REQ_F_CUR_POS)
 		req->file->f_pos = rw->kiocb.ki_pos;
 	if (ret >= 0 && (rw->kiocb.ki_complete == io_complete_rw)) {
 		if (!__io_complete_rw_common(req, ret)) {
-			io_req_set_res(req, req->cqe.res,
+			io_req_set_res(req, final_ret,
 				       io_put_kbuf(req, issue_flags));
 			return IOU_OK;
 		}
@@ -268,7 +274,7 @@ static int kiocb_done(struct io_kiocb *req, ssize_t ret,
 		if (io_resubmit_prep(req))
 			io_req_task_queue_reissue(req);
 		else
-			io_req_task_queue_fail(req, ret);
+			io_req_task_queue_fail(req, final_ret);
 	}
 	return IOU_ISSUE_SKIP_COMPLETE;
 }