From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 41F29C433E2 for ; Thu, 17 Sep 2020 15:11:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B65102078D for ; Thu, 17 Sep 2020 15:11:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="D645jx3+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B65102078D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3701A8E0003; Thu, 17 Sep 2020 11:11:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 32844900002; Thu, 17 Sep 2020 11:11:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1F6768E0006; Thu, 17 Sep 2020 11:11:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 02FEB8E0003 for ; Thu, 17 Sep 2020 11:11:00 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id B4290180D0E83 for ; Thu, 17 Sep 2020 15:11:00 +0000 (UTC) X-FDA: 77272891080.03.mice82_2111f1627123 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id 81E5328A4E9 for ; Thu, 17 Sep 2020 15:11:00 +0000 (UTC) X-HE-Tag: mice82_2111f1627123 X-Filterd-Recvd-Size: 2794 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Thu, 17 Sep 2020 15:10:59 +0000 (UTC) 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=7PovnjudVvfMFRelS0S3FBS5rSwGm8lIgwb2+HktnS4=; b=D645jx3+cFCsRRamnPvY93SEZp 5idHKpebB8d3ADFC2w4jUoevXr+eTIRxNa5kP7rmXI6dNgJMDifFkNUwyxkfzlOpmnvRWxVU5jou6 Xw3Ux6iN9o3h3kHwgElGrUzy3LHDgVNd3s5BPl5exxvz1fUpq9hJvXiR37faoM+sF3w8SWjVVHpn7 XgSvgnOD/jvaGa9gFE7xBAHrq5dHmW9PfWz6ML6kWQtUWTATDyCEZSzBC/OaokwaNH9edWskgRnmd ND+y1E4RMQjT3HXerG2yb2g3MloOlpPyn3rFXB+gng2IT5jOzDOkDYvVy7UnUbP3VIkuuaEa5JGWf 4qy4un+Q==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kIvYi-0001PN-HJ; Thu, 17 Sep 2020 15:10:52 +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 02/13] 9p: Tell the VFS that readpage was synchronous Date: Thu, 17 Sep 2020 16:10:39 +0100 Message-Id: <20200917151050.5363-3-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 X-Rspamd-Queue-Id: 81E5328A4E9 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The 9p readpage implementation was already synchronous, so use AOP_UPDATED_PAGE to avoid cycling the page lock. Signed-off-by: Matthew Wilcox (Oracle) --- fs/9p/vfs_addr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c index cce9ace651a2..506ca0ba2ec7 100644 --- a/fs/9p/vfs_addr.c +++ b/fs/9p/vfs_addr.c @@ -65,7 +65,7 @@ static int v9fs_fid_readpage(void *data, struct page *p= age) SetPageUptodate(page); =20 v9fs_readpage_to_fscache(inode, page); - retval =3D 0; + return AOP_UPDATED_PAGE; =20 done: unlock_page(page); @@ -280,6 +280,10 @@ static int v9fs_write_begin(struct file *filp, struc= t address_space *mapping, goto out; =20 retval =3D v9fs_fid_readpage(v9inode->writeback_fid, page); + if (retval =3D=3D AOP_UPDATED_PAGE) { + retval =3D 0; + goto out; + } put_page(page); if (!retval) goto start; --=20 2.28.0