From patchwork Mon Jan 25 21:36:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 370690 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=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS autolearn=unavailable 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 9FCB9C433E9 for ; Mon, 25 Jan 2021 22:16:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7544F22582 for ; Mon, 25 Jan 2021 22:16:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732648AbhAYV73 (ORCPT ); Mon, 25 Jan 2021 16:59:29 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:43078 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732847AbhAYVhk (ORCPT ); Mon, 25 Jan 2021 16:37:40 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611610572; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=m/jJWmyA2+poctNq5G0VdmcEbmCQkA+CfKhQbvw3Sok=; b=CaruwkWnk/omBMHunCRR2Y80lt+NxRsfMPBiBx493s6CVOrJM38yRga+vKEOjmfKKXqfIr +68Y9F6odVFpmHPe5XoLEQg+WR7oVraSEhbdZiYadBb4ha95MvuskSGDNpDsbjD5P1JkvZ tDXV+rvNhiIv6hXj1fASOQxgCg4r6cU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-463-9_HLUwZmOv2dJ-b2PcUTtQ-1; Mon, 25 Jan 2021 16:36:10 -0500 X-MC-Unique: 9_HLUwZmOv2dJ-b2PcUTtQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 557E08735C1; Mon, 25 Jan 2021 21:36:08 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-115-23.rdu2.redhat.com [10.10.115.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id 827814D; Mon, 25 Jan 2021 21:36:02 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 26/32] NFS: In nfs_readpage() only increment NFSIOS_READPAGES when read succeeds From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet Cc: Dave Wysochanski , dhowells@redhat.com, Jeff Layton , David Wysochanski , Matthew Wilcox , Alexander Viro , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 25 Jan 2021 21:36:01 +0000 Message-ID: <161161056169.2537118.7782201331459075721.stgit@warthog.procyon.org.uk> In-Reply-To: <161161025063.2537118.2009249444682241405.stgit@warthog.procyon.org.uk> References: <161161025063.2537118.2009249444682241405.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Dave Wysochanski There is a small inconsistency with nfs_readpage() vs nfs_readpages() with regards to NFSIOS_READPAGES. In readpage we unconditionally increment NFSIOS_READPAGES at the top, which means even if the read fails. In readpages, we increment NFSIOS_READPAGES at the bottom based on how many pages were successfully read. Change readpage to be consistent with readpages and so NFSIOS_READPAGES only reflects successful, non-fscache reads. Signed-off-by: Dave Wysochanski --- fs/nfs/read.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfs/read.c b/fs/nfs/read.c index a05fb3904ddf..1153c4e0a155 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -319,7 +319,6 @@ int nfs_readpage(struct file *filp, struct page *page) dprintk("NFS: nfs_readpage (%p %ld@%lu)\n", page, PAGE_SIZE, page_index(page)); nfs_inc_stats(inode, NFSIOS_VFSREADPAGE); - nfs_add_stats(inode, NFSIOS_READPAGES, 1); /* * Try to flush any pending writes to the file.. @@ -359,6 +358,7 @@ int nfs_readpage(struct file *filp, struct page *page) if (!PageUptodate(page) && !ret) ret = xchg(&ctx->error, 0); } + nfs_add_stats(inode, NFSIOS_READPAGES, 1); out: put_nfs_open_context(ctx); return ret;