From 6c6253fa52b3b5f15a97484785664494b8da2d36 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Sun, 15 Aug 2021 10:40:20 +0100
Subject: [PATCH 05/11] io_uring: optimise initial ltimeout refcounting
Git-commit: fb6820998f57a3e63a382a322530fa28522a2bba
Patch-mainline: v5.15-rc1
References: bnc#1205205
Linked timeouts are never refcounted when it comes to the first call to
__io_prep_linked_timeout(), so save an io_ref_get() and set the desired
value directly.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/177b24cc62ffbb42d915d6eb9e8876266e4c0d5a.1628981736.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
fs/io_uring.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1312,8 +1312,7 @@ static struct io_kiocb *__io_prep_linked
/* linked timeouts should have two refs once prep'ed */
io_req_set_refcount(req);
- io_req_set_refcount(nxt);
- req_ref_get(nxt);
+ __io_req_set_refcount(nxt, 2);
nxt->timeout.head = req;
nxt->flags |= REQ_F_LTIMEOUT_ACTIVE;