linux-kernel - Re: [RFC PATCH v2 04/48] net: Declare MSG_SPLICE

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Message-ID: <854582.1680188845@warthog.procyon.org.uk>
Date:   Thu, 30 Mar 2023 16:07:25 +0100
From:   David Howells <dhowells@...hat.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     dhowells@...hat.com, Matthew Wilcox <willy@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jeff Layton <jlayton@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        Chuck Lever III <chuck.lever@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        netdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH v2 04/48] net: Declare MSG_SPLICE_PAGES internal sendmsg() flag

Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:

> No need to modify __sys_sendmmsg explicitly, as it ends up calling
> __sys_sendmsg?
> 
> Also, sendpage does this flags masking in the internal sock_FUNC
> helpers rather than __sys_FUNC. Might be preferable.

I was wondering whether other flags, such as MSG_BATCH should be added to the
list.  Is it bad if userspace sets that in sendmsg()?  AF_KCM, at least, looks
at it.

David