Revert "io_uring/rw: drop -EOPNOTSUPP check in __io_complete_rw_common()"

This reverts commit 90bfb28.

Kevin reports that this commit causes an issue for him with LVM
snapshots, most likely because of turning off NOWAIT support while a
snapshot is being created. This makes -EOPNOTSUPP bubble back through
the completion handler, where io_uring read/write handling should just
retry it.

Reinstate the previous check removed by the referenced commit.

Cc: [email protected]
Fixes: 90bfb28 ("io_uring/rw: drop -EOPNOTSUPP check in __io_complete_rw_common()")
Reported-by: Salvatore Bonaccorso <[email protected]>
Reported-by: Kevin Lumik <[email protected]>
Link: https://lore.kernel.org/io-uring/[email protected]/
Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

io_uring/rw.c

@@ -542,7 +542,7 @@ static void __io_complete_rw_common(struct io_kiocb *req, long res)
 {
 	if (res == req->cqe.res)
 		return;
-	if (res == -EAGAIN && io_rw_should_reissue(req)) {
+	if ((res == -EOPNOTSUPP || res == -EAGAIN) && io_rw_should_reissue(req)) {
 		req->flags |= REQ_F_REISSUE | REQ_F_BL_NO_RECYCLE;
 	} else {
 		req_set_fail(req);