From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8D792C64E7D for ; Thu, 19 Nov 2020 16:27:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3093A20702 for ; Thu, 19 Nov 2020 16:27:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="art9hBd5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728831AbgKSQ1f (ORCPT ); Thu, 19 Nov 2020 11:27:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726820AbgKSQ1d (ORCPT ); Thu, 19 Nov 2020 11:27:33 -0500 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 46A5FC0613CF for ; Thu, 19 Nov 2020 08:27:33 -0800 (PST) Received: by mail-wr1-x432.google.com with SMTP id m6so7053407wrg.7 for ; Thu, 19 Nov 2020 08:27:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=IioeS9Dg9AkawJC0rA82bgYAMNg3xp44Pj00qEh6sh0=; b=art9hBd5P5j/+kj2P0wYHIZjL6yunREWPR+kjYldAXaIYpQDQIDE6+hbt9sz5fQl1b 6n5/y6CAppjkpeomOnpoztMCbW/12R5Vl5klCknADcQrLXomSUEyO4tKjWdqw6g8yxJm eTyVOHOaKFslVAWrXAy7iR9M7XZzCHQ+lSLY4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=IioeS9Dg9AkawJC0rA82bgYAMNg3xp44Pj00qEh6sh0=; b=jwnpUSdZdtCCTofXGSMXFqX9Ed4as2f4/ranUdnGW+1VToqptk2b16An7B8wczfpbw YneKBV5ren5Zd2Qavhe9TdHbEQUcA75J2+N3hmf12uThudyHnfxqNpumfjoHPjGKrv71 gH5tAZaak1JrnKk3wPSud04UnwwJ/kzZUfYgDhh7QMg0ubY0ILLp2RbQYlbkHxRdMXa/ 3bwCa/yDTX4oU31Z34wR1E+eY5LX2N/SbZgHBQwsKDKc4yaxevYsMbj5m9wgt27WXa0h O6jCltsGwNK55GBAy7S+NPEfWBmqGsbmroJ5Py/wKmOZYqw5c8RfHF9056Jce67JtTPc dmrQ== X-Gm-Message-State: AOAM533N9mJai/QwjLuUERc8OhAGDO24FGQjMk2GSVW4lMrHsTGnVkZE 9EtLXgYb0nonGPjRxhXjsrza1A== X-Google-Smtp-Source: ABdhPJxK7kKv1EW1z/PdDbWzwBgQkw86caAXfKxPThm4XVwabqrtLp3LqHZNmdddOkTyzAgbPYHonA== X-Received: by 2002:adf:9104:: with SMTP id j4mr11959123wrj.198.1605803251881; Thu, 19 Nov 2020 08:27:31 -0800 (PST) Received: from revest.zrh.corp.google.com ([2a00:79e0:42:204:f693:9fff:fef4:a569]) by smtp.gmail.com with ESMTPSA id i5sm380061wrw.45.2020.11.19.08.27.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Nov 2020 08:27:31 -0800 (PST) From: Florent Revest To: bpf@vger.kernel.org Cc: viro@zeniv.linux.org.uk, davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, kafai@fb.com, yhs@fb.com, andrii@kernel.org, kpsingh@chromium.org, revest@google.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v2 1/5] net: Remove the err argument from sock_from_file Date: Thu, 19 Nov 2020 17:26:50 +0100 Message-Id: <20201119162654.2410685-1-revest@chromium.org> X-Mailer: git-send-email 2.29.2.299.gdc1121823c-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Florent Revest Currently, the sock_from_file prototype takes an "err" pointer that is either not set or set to -ENOTSOCK IFF the returned socket is NULL. This makes the error redundant and it is ignored by a few callers. This patch simplifies the API by letting callers deduce the error based on whether the returned socket is NULL or not. Suggested-by: Al Viro Signed-off-by: Florent Revest --- fs/eventpoll.c | 3 +-- fs/io_uring.c | 16 ++++++++-------- include/linux/net.h | 2 +- net/core/netclassid_cgroup.c | 3 +-- net/core/netprio_cgroup.c | 3 +-- net/core/sock.c | 8 +------- net/socket.c | 27 ++++++++++++++++----------- 7 files changed, 29 insertions(+), 33 deletions(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 4df61129566d..c764d8d5a76a 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -415,12 +415,11 @@ static inline void ep_set_busy_poll_napi_id(struct epitem *epi) unsigned int napi_id; struct socket *sock; struct sock *sk; - int err; if (!net_busy_loop_on()) return; - sock = sock_from_file(epi->ffd.file, &err); + sock = sock_from_file(epi->ffd.file); if (!sock) return; diff --git a/fs/io_uring.c b/fs/io_uring.c index 8018c7076b25..ace99b15cbd3 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4341,9 +4341,9 @@ static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, unsigned flags; int ret; - sock = sock_from_file(req->file, &ret); + sock = sock_from_file(req->file); if (unlikely(!sock)) - return ret; + return -ENOTSOCK; if (req->async_data) { kmsg = req->async_data; @@ -4390,9 +4390,9 @@ static int io_send(struct io_kiocb *req, bool force_nonblock, unsigned flags; int ret; - sock = sock_from_file(req->file, &ret); + sock = sock_from_file(req->file); if (unlikely(!sock)) - return ret; + return -ENOTSOCK; ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); if (unlikely(ret)) @@ -4569,9 +4569,9 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, unsigned flags; int ret, cflags = 0; - sock = sock_from_file(req->file, &ret); + sock = sock_from_file(req->file); if (unlikely(!sock)) - return ret; + return -ENOTSOCK; if (req->async_data) { kmsg = req->async_data; @@ -4632,9 +4632,9 @@ static int io_recv(struct io_kiocb *req, bool force_nonblock, unsigned flags; int ret, cflags = 0; - sock = sock_from_file(req->file, &ret); + sock = sock_from_file(req->file); if (unlikely(!sock)) - return ret; + return -ENOTSOCK; if (req->flags & REQ_F_BUFFER_SELECT) { kbuf = io_recv_buffer_select(req, !force_nonblock); diff --git a/include/linux/net.h b/include/linux/net.h index 0dcd51feef02..9e2324efc26a 100644 --- a/include/linux/net.h +++ b/include/linux/net.h @@ -240,7 +240,7 @@ int sock_sendmsg(struct socket *sock, struct msghdr *msg); int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags); struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname); struct socket *sockfd_lookup(int fd, int *err); -struct socket *sock_from_file(struct file *file, int *err); +struct socket *sock_from_file(struct file *file); #define sockfd_put(sock) fput(sock->file) int net_ratelimit(void); diff --git a/net/core/netclassid_cgroup.c b/net/core/netclassid_cgroup.c index 41b24cd31562..b49c57d35a88 100644 --- a/net/core/netclassid_cgroup.c +++ b/net/core/netclassid_cgroup.c @@ -68,9 +68,8 @@ struct update_classid_context { static int update_classid_sock(const void *v, struct file *file, unsigned n) { - int err; struct update_classid_context *ctx = (void *)v; - struct socket *sock = sock_from_file(file, &err); + struct socket *sock = sock_from_file(file); if (sock) { spin_lock(&cgroup_sk_update_lock); diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c index 9bd4cab7d510..99a431c56f23 100644 --- a/net/core/netprio_cgroup.c +++ b/net/core/netprio_cgroup.c @@ -220,8 +220,7 @@ static ssize_t write_priomap(struct kernfs_open_file *of, static int update_netprio(const void *v, struct file *file, unsigned n) { - int err; - struct socket *sock = sock_from_file(file, &err); + struct socket *sock = sock_from_file(file); if (sock) { spin_lock(&cgroup_sk_update_lock); sock_cgroup_set_prioidx(&sock->sk->sk_cgrp_data, diff --git a/net/core/sock.c b/net/core/sock.c index 727ea1cc633c..dd0598d831ef 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2808,14 +2808,8 @@ EXPORT_SYMBOL(sock_no_mmap); void __receive_sock(struct file *file) { struct socket *sock; - int error; - /* - * The resulting value of "error" is ignored here since we only - * need to take action when the file is a socket and testing - * "sock" for NULL is sufficient. - */ - sock = sock_from_file(file, &error); + sock = sock_from_file(file); if (sock) { sock_update_netprioidx(&sock->sk->sk_cgrp_data); sock_update_classid(&sock->sk->sk_cgrp_data); diff --git a/net/socket.c b/net/socket.c index 6e6cccc2104f..c799d9652a2c 100644 --- a/net/socket.c +++ b/net/socket.c @@ -445,17 +445,15 @@ static int sock_map_fd(struct socket *sock, int flags) /** * sock_from_file - Return the &socket bounded to @file. * @file: file - * @err: pointer to an error code return * - * On failure returns %NULL and assigns -ENOTSOCK to @err. + * On failure returns %NULL. */ -struct socket *sock_from_file(struct file *file, int *err) +struct socket *sock_from_file(struct file *file) { if (file->f_op == &socket_file_ops) return file->private_data; /* set in sock_map_fd */ - *err = -ENOTSOCK; return NULL; } EXPORT_SYMBOL(sock_from_file); @@ -484,9 +482,11 @@ struct socket *sockfd_lookup(int fd, int *err) return NULL; } - sock = sock_from_file(file, err); - if (!sock) + sock = sock_from_file(file); + if (!sock) { + *err = -ENOTSOCK; fput(file); + } return sock; } EXPORT_SYMBOL(sockfd_lookup); @@ -498,11 +498,12 @@ static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) *err = -EBADF; if (f.file) { - sock = sock_from_file(f.file, err); + sock = sock_from_file(f.file); if (likely(sock)) { *fput_needed = f.flags & FDPUT_FPUT; return sock; } + *err = -ENOTSOCK; fdput(f); } return NULL; @@ -1715,9 +1716,11 @@ int __sys_accept4_file(struct file *file, unsigned file_flags, if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; - sock = sock_from_file(file, &err); - if (!sock) + sock = sock_from_file(file); + if (!sock) { + err = -ENOTSOCK; goto out; + } err = -ENFILE; newsock = sock_alloc(); @@ -1840,9 +1843,11 @@ int __sys_connect_file(struct file *file, struct sockaddr_storage *address, struct socket *sock; int err; - sock = sock_from_file(file, &err); - if (!sock) + sock = sock_from_file(file); + if (!sock) { + err = -ENOTSOCK; goto out; + } err = security_socket_connect(sock, (struct sockaddr *)address, addrlen); -- 2.29.2.299.gdc1121823c-goog