netdev - Re: [PATCH net-next] libceph: Partially revert changes to support MSG_SPLICE

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Message-ID: <3109248.1687812255@warthog.procyon.org.uk>
Date: Mon, 26 Jun 2023 21:44:15 +0100
From: David Howells <dhowells@...hat.com>
To: Ilya Dryomov <idryomov@...il.com>
Cc: dhowells@...hat.com, netdev@...r.kernel.org,
    Xiubo Li <xiubli@...hat.com>, Jeff Layton <jlayton@...nel.org>,
    "David S. Miller" <davem@...emloft.net>,
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
    Paolo Abeni <pabeni@...hat.com>, Jens Axboe <axboe@...nel.dk>,
    Matthew Wilcox <willy@...radead.org>, ceph-devel@...r.kernel.org,
    linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] libceph: Partially revert changes to support MSG_SPLICE_PAGES

Ilya Dryomov <idryomov@...il.com> wrote:

>   if (sendpage_ok(bv.bv_page))
>           msg.msg_flags |= MSG_SPLICE_PAGES;
>   else
>           msg.msg_flags &= ~MSG_SPLICE_PAGES;

Hmmm...  I'm not sure there's any guarantee that msg, including msg_flags,
won't get altered by ->sendmsg().

David