From patchwork Thu Nov 26 16:44:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florent Revest X-Patchwork-Id: 11934351 X-Patchwork-Delegate: bpf@iogearbox.net 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 56845C63697 for ; Thu, 26 Nov 2020 16:45:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C2BF221E9 for ; Thu, 26 Nov 2020 16:45:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="YZ/SabCw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391538AbgKZQpl (ORCPT ); Thu, 26 Nov 2020 11:45:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59068 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391290AbgKZQpk (ORCPT ); Thu, 26 Nov 2020 11:45:40 -0500 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3980CC0613D4 for ; Thu, 26 Nov 2020 08:45:40 -0800 (PST) Received: by mail-wr1-x443.google.com with SMTP id r3so2829662wrt.2 for ; Thu, 26 Nov 2020 08:45:40 -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=OzwTSFRm2NQ0xmYlvkrP6vFZBi0q2EwWN/7wEw0Mm2M=; b=YZ/SabCw3GMPxVQifMw1wfMaBRwSvKNZLOkWk1+4MgwdSio9a6nOJlqYwFZ+yxSi/i a+vHHSNaWuIzK4AyTU3K6YX5ytvou2EDpRwGRUviaUwnfnMeunFsYUP9SeaH1BE1KdGa 6EeLLEq/OHFhzoDLA3k6sp2itKCu3Rr+HGmNA= 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=OzwTSFRm2NQ0xmYlvkrP6vFZBi0q2EwWN/7wEw0Mm2M=; b=PduYe2ZAqI/3gAU5FXDmZZ7JJhpgkO+8ePL21MyFtqmGp9ta8EEJgtuHmYZcPjBd5x V01uuTlrYF8++K3I/Xy9D+gtz7pcUq9A62n8QL2M+Wnb38HIgvpN6Z0MGlrYqKHm0ltX CMs+hOKiWxVgpe/4LqhwUzkYgsjCeOk1H/ZKzP9y8pKe4bgu5jzPMAd0fjXJu7BG6Qgo L7Y8x5HB5+WBJtEtqo4sffF1F/X4AgqDt7LjxWqAhtWcCHivBBfChiWLmxRwQB4egqrj E0T0gpVN4Ynx1RmoKa9rCP5aDUzXqf4jAvOV/1fRfuU8jWfRnfzo/ny7dO5qz4YZUvWM T4lA== X-Gm-Message-State: AOAM5328RgZOyDSUr/Yoef9/62w1dwas+sJCB+FKTukOik649usmws/h FABh7qNg2t8v+Xi34WsMhBeqPQ== X-Google-Smtp-Source: ABdhPJyYejpp3WfNREOwXD1l8xon+U7PTR6cUwtqEEC3XDtPWEu/+1prYheAeaU+VwTsatLipM9E6A== X-Received: by 2002:adf:eeca:: with SMTP id a10mr4845073wrp.186.1606409138934; Thu, 26 Nov 2020 08:45:38 -0800 (PST) Received: from revest.zrh.corp.google.com ([2a00:79e0:42:204:f693:9fff:fef4:a569]) by smtp.gmail.com with ESMTPSA id f17sm8805824wmh.10.2020.11.26.08.45.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Nov 2020 08:45:38 -0800 (PST) From: Florent Revest X-Google-Original-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 bpf-next v3 1/6] net: Remove the err argument from sock_from_file Date: Thu, 26 Nov 2020 17:44:44 +0100 Message-Id: <20201126164449.1745292-1-revest@google.com> X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net 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 Reviewed-by: KP Singh --- 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);