From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-604614-1527103851-2-957232424482777901 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.248, MAILING_LIST_MULTI -1, RCVD_IN_DNSWL_HI -5, LANGUAGES unknown, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='de', MailFrom='org' X-Spam-charsets: X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-api-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1527103850; b=C1/x/Uy2RuLe+Uy0DEl6ZcUoLRt1aScDh62cUxm1YHmQC+Wv87 1CJoOCmknVZ8opNln3Lqu8/Si6Vrw4pEDjOHofM+oQ113vJDMNxT2v3iVIkE0SNx AnbgjSsCfUt56j4aamOehMQz8HwYXb59SB7eR9U21VAyfc6V9Yuk+PI4Z3PH0W7e a0CPG7rX6l9IQRR6FNzrTGJdsbUgw1w3DDAWhHYBw6Hyf4MknX2/kbp4uWaBrIwb 4SpwOhINtnKa+wzmEZcbXpjwfI5ZBM6htt2nTZF8PuSNWM38PoRFXyiEp6PbqhBu WHwFmbOPi3/6HM7LqzFilmbhHXZjaIYgzXjA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:sender:list-id; s=fm2; t=1527103850; bh= 0vmoDaEF5aIv4/Y4xpA7eTPmgHMPL1VeLWlsFjjwC7o=; b=GN4FultjR4zsGyyO wDBwfR9Yrl2zY28D2G2/ijV6OsYBr3KaeTbSgAeZIIRIBM23t7cdbRn27lvQRONA yF3+6GfT1lykulY6hbi5QyM2Qy4xGsBumIZXuismP0mPHRY2yX0Jb2Jtjo0tY/F+ OgfUqS/qmXHVvEV2yumkKIIdQiPNPlces4p991R3FUWy64PlB449RU4dRp8Pi2cJ tqXFAyVK8OvWhDoSDOrtFnx4djGfw33VjKXBLjPKwhVwyCKTozx+RetWIL1TsaAo 0KBLy8yStsue52nHHickqUdyIfRSJngLBYVxEoSlDqQHg+vxL6pITlTZB/HjX9J/ gje7gg== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered, 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=TXByh7WR x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=lst.de; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=lst.de header.result=pass header_is_org_domain=yes; x-vs=clean score=0 state=0 Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered, 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=TXByh7WR x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=lst.de; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=lst.de header.result=pass header_is_org_domain=yes; x-vs=clean score=0 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfP9h5M6EMnVZW6E+jwcd0mFUStHJh8OdqaXxEjacMJWQ6/4wNFW8L3LFbOQXnFA6KlNk6nHWgUAeQ7/W8+WLY4pbA/r3RHXekN4RLfkah6T3Wl5QTz2N 5CGPiGPEGBI56Q5gCaXpG5kSUURVHYJUBQAGeVeux6/oqNjte8IuN8QxPaX5VH+f79d98UdZJ91lW54tBAE3Ixno7GnirM4jwWZcSXy2Ru1F0+UlesHZpTqJ X-CM-Analysis: v=2.3 cv=E8HjW5Vl c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=VUJBJC2UJ8kA:10 a=VwQbUJbxAAAA:8 a=PwPxyESu6iuoCfwzTd8A:9 a=x8gzFH9gYPwA:10 a=AjGcO6oz07-iQ99wixmX:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934447AbeEWTa3 (ORCPT ); Wed, 23 May 2018 15:30:29 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:40776 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934412AbeEWTVE (ORCPT ); Wed, 23 May 2018 15:21:04 -0400 From: Christoph Hellwig To: viro@zeniv.linux.org.uk Cc: Avi Kivity , linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 13/33] net: add support for ->poll_mask in proto_ops Date: Wed, 23 May 2018 21:20:02 +0200 Message-Id: <20180523192022.1703-14-hch@lst.de> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180523192022.1703-1-hch@lst.de> References: <20180523192022.1703-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: The socket file operations still implement ->poll until all protocols are switched over. Signed-off-by: Christoph Hellwig --- include/linux/net.h | 1 + net/socket.c | 48 ++++++++++++++++++++++++++++++++++++++++----- 2 files changed, 44 insertions(+), 5 deletions(-) diff --git a/include/linux/net.h b/include/linux/net.h index 2248a052061d..3fd9d8c16581 100644 --- a/include/linux/net.h +++ b/include/linux/net.h @@ -147,6 +147,7 @@ struct proto_ops { int (*getname) (struct socket *sock, struct sockaddr *addr, int peer); + __poll_t (*poll_mask) (struct socket *sock, __poll_t events); __poll_t (*poll) (struct file *file, struct socket *sock, struct poll_table_struct *wait); int (*ioctl) (struct socket *sock, unsigned int cmd, diff --git a/net/socket.c b/net/socket.c index 571ee4005192..2d752e9eb3f9 100644 --- a/net/socket.c +++ b/net/socket.c @@ -117,8 +117,10 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); static int sock_mmap(struct file *file, struct vm_area_struct *vma); static int sock_close(struct inode *inode, struct file *file); -static __poll_t sock_poll(struct file *file, - struct poll_table_struct *wait); +static struct wait_queue_head *sock_get_poll_head(struct file *file, + __poll_t events); +static __poll_t sock_poll_mask(struct file *file, __poll_t); +static __poll_t sock_poll(struct file *file, struct poll_table_struct *wait); static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); #ifdef CONFIG_COMPAT static long compat_sock_ioctl(struct file *file, @@ -141,6 +143,8 @@ static const struct file_operations socket_file_ops = { .llseek = no_llseek, .read_iter = sock_read_iter, .write_iter = sock_write_iter, + .get_poll_head = sock_get_poll_head, + .poll_mask = sock_poll_mask, .poll = sock_poll, .unlocked_ioctl = sock_ioctl, #ifdef CONFIG_COMPAT @@ -1114,14 +1118,48 @@ int sock_create_lite(int family, int type, int protocol, struct socket **res) } EXPORT_SYMBOL(sock_create_lite); +static struct wait_queue_head *sock_get_poll_head(struct file *file, + __poll_t events) +{ + struct socket *sock = file->private_data; + + if (!sock->ops->poll_mask) + return NULL; + sock_poll_busy_loop(sock, events); + return sk_sleep(sock->sk); +} + +static __poll_t sock_poll_mask(struct file *file, __poll_t events) +{ + struct socket *sock = file->private_data; + + /* + * We need to be sure we are in sync with the socket flags modification. + * + * This memory barrier is paired in the wq_has_sleeper. + */ + smp_mb(); + + /* this socket can poll_ll so tell the system call */ + return sock->ops->poll_mask(sock, events) | + (sk_can_busy_loop(sock->sk) ? POLL_BUSY_LOOP : 0); +} + /* No kernel lock held - perfect */ static __poll_t sock_poll(struct file *file, poll_table *wait) { struct socket *sock = file->private_data; - __poll_t events = poll_requested_events(wait); + __poll_t events = poll_requested_events(wait), mask = 0; - sock_poll_busy_loop(sock, events); - return sock->ops->poll(file, sock, wait) | sock_poll_busy_flag(sock); + if (sock->ops->poll) { + sock_poll_busy_loop(sock, events); + mask = sock->ops->poll(file, sock, wait); + } else if (sock->ops->poll_mask) { + sock_poll_wait(file, sock_get_poll_head(file, events), wait); + mask = sock->ops->poll_mask(sock, events); + } + + return mask | sock_poll_busy_flag(sock); } static int sock_mmap(struct file *file, struct vm_area_struct *vma) -- 2.17.0