From patchwork Thu Sep 17 15:10:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 11783445 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 279AC18A4 for ; Thu, 17 Sep 2020 19:54:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B50C235F8 for ; Thu, 17 Sep 2020 19:54:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="lom2Li8C" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728046AbgIQPOA (ORCPT ); Thu, 17 Sep 2020 11:14:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727668AbgIQPL0 (ORCPT ); Thu, 17 Sep 2020 11:11:26 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EACDDC06178C; Thu, 17 Sep 2020 08:10:54 -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=lom2Li8CD5jx4y8HUW5Lgpotel g5sgTa8o84FBY6eD9XZnsMogJwTzS0kX7EHBuY/49XLLZXSR4wLmhLgOb8JW7CscVwWQrnNwBAKHr j7CVV6g0cXwc+nGT4AIAJA808eU22SNJ9CBJ/8/F5v+XL4rlYVow3XW0/atXcL99l5y8iFAwKj/g+ r1932WK61SVY5dsFLtPsuy1gB3GgM9VZRVr0L9vl//Vxq3aoPu9AzJ+ux9mTb8dBZaYYreEY0dZiz NENBckd2xTM7maqIO9KDD3crOW0EjJfYim3RWyi8WUGUkvbBfG6gSWZUH/7Wnm/yCfVKjLrOOaE5P raCfhwcw==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kIvYj-0001Pi-5U; Thu, 17 Sep 2020 15:10:53 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, v9fs-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org, ecryptfs@vger.kernel.org, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, Richard Weinberger Subject: [PATCH 05/13] cifs: Tell the VFS that readpage was synchronous Date: Thu, 17 Sep 2020 16:10:42 +0100 Message-Id: <20200917151050.5363-6-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200917151050.5363-1-willy@infradead.org> References: <20200917151050.5363-1-willy@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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;