From nobody Mon Feb 9 07:22:11 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C22D1C77B7A for ; Wed, 7 Jun 2023 14:54:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239408AbjFGOyD (ORCPT ); Wed, 7 Jun 2023 10:54:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241203AbjFGOx5 (ORCPT ); Wed, 7 Jun 2023 10:53:57 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF3A61FC2 for ; Wed, 7 Jun 2023 07:53:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686149590; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YYh07r9nLp9Gj3Ft6ZNJdfT/+HiAyQEDDAL/yG5YQDg=; b=TwIm3YbA4I1lRtNOQ22Yj59OsHaK/RuLeX6r8/xsvM8uisLWSlC88aMqxjg4iE9vGp0lvt nuyCaceCU4Uwd6rI3BkEhZdkn+5IOkTfASQZ1hl859smfh1cstPi4fDnZtKdgBp8tQ1v+0 zwxhfJ1azXgdNGVIQbplyp7k3mBQs3w= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-134-blPYcdEnN0m5yZ91Tl7iqQ-1; Wed, 07 Jun 2023 10:06:44 -0400 X-MC-Unique: blPYcdEnN0m5yZ91Tl7iqQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E47528028B1; Wed, 7 Jun 2023 14:06:42 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.182]) by smtp.corp.redhat.com (Postfix) with ESMTP id C031E4021AA; Wed, 7 Jun 2023 14:06:39 +0000 (UTC) From: David Howells To: netdev@vger.kernel.org, Linus Torvalds Cc: David Howells , Chuck Lever , Boris Pismenny , John Fastabend , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Willem de Bruijn , David Ahern , Matthew Wilcox , Jens Axboe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Tom Herbert , Tom Herbert , Cong Wang Subject: [PATCH net-next v5 09/14] kcm: Use splice_eof() to flush Date: Wed, 7 Jun 2023 15:05:54 +0100 Message-ID: <20230607140559.2263470-10-dhowells@redhat.com> In-Reply-To: <20230607140559.2263470-1-dhowells@redhat.com> References: <20230607140559.2263470-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Allow splice to undo the effects of MSG_MORE after prematurely ending a splice/sendfile due to getting an EOF condition (->splice_read() returned 0) after splice had called sendmsg() with MSG_MORE set when the user didn't set MSG_MORE. Suggested-by: Linus Torvalds Link: https://lore.kernel.org/r/CAHk-=3Dwh=3DV579PDYvkpnTobCLGczbgxpMgGmmhq= iTyE34Cpi5Gg@mail.gmail.com/ Signed-off-by: David Howells cc: Tom Herbert cc: Tom Herbert cc: Cong Wang cc: Jakub Kicinski cc: Eric Dumazet cc: "David S. Miller" cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: netdev@vger.kernel.org --- net/kcm/kcmsock.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c index ba22af16b96d..d0d8c54562d6 100644 --- a/net/kcm/kcmsock.c +++ b/net/kcm/kcmsock.c @@ -968,6 +968,19 @@ static int kcm_sendmsg(struct socket *sock, struct msg= hdr *msg, size_t len) return err; } =20 +static void kcm_splice_eof(struct socket *sock) +{ + struct sock *sk =3D sock->sk; + struct kcm_sock *kcm =3D kcm_sk(sk); + + if (skb_queue_empty(&sk->sk_write_queue)) + return; + + lock_sock(sk); + kcm_write_msgs(kcm); + release_sock(sk); +} + static ssize_t kcm_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) =20 @@ -1773,6 +1786,7 @@ static const struct proto_ops kcm_dgram_ops =3D { .sendmsg =3D kcm_sendmsg, .recvmsg =3D kcm_recvmsg, .mmap =3D sock_no_mmap, + .splice_eof =3D kcm_splice_eof, .sendpage =3D kcm_sendpage, }; =20 @@ -1794,6 +1808,7 @@ static const struct proto_ops kcm_seqpacket_ops =3D { .sendmsg =3D kcm_sendmsg, .recvmsg =3D kcm_recvmsg, .mmap =3D sock_no_mmap, + .splice_eof =3D kcm_splice_eof, .sendpage =3D kcm_sendpage, .splice_read =3D kcm_splice_read, };