From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3488533-1521618678-2-13249355107328257378 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 0.25, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES unknown, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', 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=arctest; t=1521618678; b=tGDFbTWqIjhQ8lCzyyyzk2kT4r71LR0LUtsc+uEnuFr5c/J aPEHx/UmdupNeggIh5ILEcT0sgKUWNocgtT892PGiHswtG9+i0aYn2S0v8ES1UcI qG71dNREfHFIc79aQm91JgNwXWLRDbak/LvV1+UiTSTlFrG77ie+EpOGr9n0Q9UI RM5/slNLqozYd7j+8rdj7zHO9z89Eo0yFdDY10P94ykwfFLGkUQV8jMa0PN8c/F+ sAtrIFYHVq1nYvKbAYQUzZB1oJCiKjNMuCAUFFjC5X8ZvUwrE0MP6PpfF4xTry3d msYa34KljsZdcypuZ7kAIf5oktE0Y+u0JmYuzdw== 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=arctest; t=1521618678; bh=nSm9LEebG2adM3KCzQOLaXIF1ofUdHW7hRMurlv3b9Q=; b=I5y8EQDQ+40d FYiLGdXHRL1nQQw40sLHJ9fxFDtD0Qtqj9GNioQ3PBzVQ/dZ8tk5EPFgvi38Uc8K JjTwubn9tnqGRcv51bojJX+9J4uRhu9kscInEW7RuVPkHVcTWFoHQnl2Tn0aTA6k 93rV/eodO4Q6uPZeYec3xazTKCty5nH/v9cEgNatBxx2CjSK3klpgumuISIesRLp IWZOprRkhQS0o0LlzTjZIZBUejGIIqsZoLXELPuuyKvXAu2Z0Evc224IRhY/pnAM T9CHGMTZC+FUo5LA4TTHMFlapEpdLP+f9C/NpjR2NWiYHWAn28/QhE1XKRnt/SAS +4r+I5Urjg== ARC-Authentication-Results: i=1; mx1.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=XsBQ5pA2 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-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: mx1.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=XsBQ5pA2 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-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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751790AbeCUHku (ORCPT ); Wed, 21 Mar 2018 03:40:50 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:47726 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751730AbeCUHkp (ORCPT ); Wed, 21 Mar 2018 03:40:45 -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 02/28] fs: cleanup do_pollfd Date: Wed, 21 Mar 2018 08:40:06 +0100 Message-Id: <20180321074032.14211-3-hch@lst.de> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20180321074032.14211-1-hch@lst.de> References: <20180321074032.14211-1-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: Use straigline code with failure handling gotos instead of a lot of nested conditionals. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/select.c | 48 +++++++++++++++++++++++------------------------- 1 file changed, 23 insertions(+), 25 deletions(-) diff --git a/fs/select.c b/fs/select.c index 686de7b3a1db..c6c504a814f9 100644 --- a/fs/select.c +++ b/fs/select.c @@ -806,34 +806,32 @@ static inline __poll_t do_pollfd(struct pollfd *pollfd, poll_table *pwait, bool *can_busy_poll, __poll_t busy_flag) { - __poll_t mask; - int fd; - - mask = 0; - fd = pollfd->fd; - if (fd >= 0) { - struct fd f = fdget(fd); - mask = EPOLLNVAL; - if (f.file) { - /* userland u16 ->events contains POLL... bitmap */ - __poll_t filter = demangle_poll(pollfd->events) | - EPOLLERR | EPOLLHUP; - mask = DEFAULT_POLLMASK; - if (f.file->f_op->poll) { - pwait->_key = filter; - pwait->_key |= busy_flag; - mask = f.file->f_op->poll(f.file, pwait); - if (mask & busy_flag) - *can_busy_poll = true; - } - /* Mask out unneeded events. */ - mask &= filter; - fdput(f); - } + int fd = pollfd->fd; + __poll_t mask = 0, filter; + struct fd f; + + if (fd < 0) + goto out; + mask = EPOLLNVAL; + f = fdget(fd); + if (!f.file) + goto out; + + /* userland u16 ->events contains POLL... bitmap */ + filter = demangle_poll(pollfd->events) | EPOLLERR | EPOLLHUP; + mask = DEFAULT_POLLMASK; + if (f.file->f_op->poll) { + pwait->_key = filter | busy_flag; + mask = f.file->f_op->poll(f.file, pwait); + if (mask & busy_flag) + *can_busy_poll = true; } + mask &= filter; /* Mask out unneeded events. */ + fdput(f); + +out: /* ... and so does ->revents */ pollfd->revents = mangle_poll(mask); - return mask; } -- 2.14.2