From patchwork Fri Oct 16 16:04:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 11842039 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 C5A61C433E7 for ; Fri, 16 Oct 2020 16:05:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6DCAF20874 for ; Fri, 16 Oct 2020 16:05:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="T7s2jwSi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2410570AbgJPQFB (ORCPT ); Fri, 16 Oct 2020 12:05:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2410439AbgJPQE4 (ORCPT ); Fri, 16 Oct 2020 12:04:56 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A4C0AC0613DA; Fri, 16 Oct 2020 09:04:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=7u5VAtMiRg84eQRBFRLzhqfSMq0woXu9gI0XciTFBfo=; b=T7s2jwSip4yAfLX9bZLFVCvA+p 9yK0UJMjNjfRwc4QujkMMQHnD4EpGzf8NY2Q8b1wbfWirWZmOvwuEVdYA2IgWbu3wRLcx2m3NcrJR pgnkENnb6D0U3t6/Jx9QCLSZFR+vCKKo5eE+oB0cPMtkELSbGoDKHuSAWBo6JcZW5ysVxdFhn9CEH AYa2KLvBQKERlJK1blr+zROW+iQmQ1L8zRrD3nXhRlwe1v2cS2cf+1WTivUi2wwlPQmD53sFO+DIP dQMivBQllAq1EF1rwL716HTgW6QpEFcRcWoW+vszPIFo2nsagHG+nay3PBx2N3VPy+mQw0ZBM1/tq HeVQaI6w==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kTSDm-0004st-Qo; Fri, 16 Oct 2020 16:04:46 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, Steve French , linux-cifs@vger.kernel.org Subject: [PATCH v3 08/18] cifs: Tell the VFS that readpage was synchronous Date: Fri, 16 Oct 2020 17:04:33 +0100 Message-Id: <20201016160443.18685-9-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20201016160443.18685-1-willy@infradead.org> References: <20201016160443.18685-1-willy@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org The cifs readpage implementation was already synchronous, so use AOP_UPDATED_PAGE to avoid cycling the page lock. Signed-off-by: Matthew Wilcox (Oracle) --- fs/cifs/file.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/cifs/file.c b/fs/cifs/file.c index be46fab4c96d..533b151a9143 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -4537,7 +4537,8 @@ static int cifs_readpage_worker(struct file *file, struct page *page, /* send this page to the cache */ cifs_readpage_to_fscache(file_inode(file), page); - rc = 0; + kunmap(page); + return AOP_UPDATED_PAGE; io_error: kunmap(page); @@ -4677,7 +4678,10 @@ static int cifs_write_begin(struct file *file, struct address_space *mapping, * an error, we don't need to return it. cifs_write_end will * do a sync write instead since PG_uptodate isn't set. */ - cifs_readpage_worker(file, page, &page_start); + int err = cifs_readpage_worker(file, page, &page_start); + + if (err == AOP_UPDATED_PAGE) + goto out; put_page(page); oncethru = 1; goto start;