From patchwork Mon Apr 26 21:20:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 12225053 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=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 F24F7C433B4 for ; Mon, 26 Apr 2021 21:20:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6C2E61040 for ; Mon, 26 Apr 2021 21:20:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234250AbhDZVU5 (ORCPT ); Mon, 26 Apr 2021 17:20:57 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31988 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234123AbhDZVU4 (ORCPT ); Mon, 26 Apr 2021 17:20:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619472013; 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=NJpO0RZmHIWgQECLsD5i8S919ZYxsRA/p8jpUjJ1CnQ=; b=W69Z5t04rfuGjcZh7D/zcWaZ+4Hjtz5piXlVtBxnm8KCGiZUFHIGGUzl6U7DPRTtuVUSzo CIv+N8LCpLNsAmEFEDpj/7rbKNH92jBazRIJdk5Ip937DIjPH0/im+DPvbLou9ZpcZApdS +i6Xp6qFCwTljOSwxkQQOgd24Eb+JuQ= 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-559-H0smkqGtPZOB_DFFJaRx_w-1; Mon, 26 Apr 2021 17:20:11 -0400 X-MC-Unique: H0smkqGtPZOB_DFFJaRx_w-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 A296B87A82A; Mon, 26 Apr 2021 21:20:08 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-112-20.rdu2.redhat.com [10.10.112.20]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9C26460BD9; Mon, 26 Apr 2021 21:20:04 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20210426210939.GS235567@casper.infradead.org> References: <20210426210939.GS235567@casper.infradead.org> <161918446704.3145707.14418606303992174310.stgit@warthog.procyon.org.uk> <3726642.1619471184@warthog.procyon.org.uk> To: Matthew Wilcox Cc: dhowells@redhat.com, linux-fsdevel@vger.kernel.org, Alexander Viro , linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, Marc Dionne , Mike Marshall , Linus Torvalds , linux-cachefs@redhat.com, Jeff Layton , Christoph Hellwig , v9fs-developer@lists.sourceforge.net, linux-mm@kvack.org, linux-afs@lists.infradead.org, Dave Wysochanski , Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , linux-kernel@vger.kernel.org Subject: [PATCH v2] netfs: Miscellaneous fixes MIME-Version: 1.0 Content-ID: <3737236.1619472003.1@warthog.procyon.org.uk> Date: Mon, 26 Apr 2021 22:20:03 +0100 Message-ID: <3737237.1619472003@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Okay, how about the attached, then? David Reviewed-by: Jeff Layton --- netfs: Miscellaneous fixes Fix some miscellaneous things in the new netfs lib[1]: (1) The kerneldoc for netfs_readpage() shouldn't say netfs_page(). (2) netfs_readpage() can get an integer overflow on 32-bit when it multiplies page_index(page) by PAGE_SIZE. It should use page_file_offset() instead. (3) netfs_write_begin() should use page_offset() to avoid the same overflow. Note that netfs_readpage() needs to use page_file_offset() rather than page_offset() as it may see swap-over-NFS. Reported-by: Matthew Wilcox Signed-off-by: David Howells Link: https://lore.kernel.org/r/161789062190.6155.12711584466338493050.stgit@warthog.procyon.org.uk/ [1] --- fs/netfs/read_helper.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c index 1d3b50c5db6d..193841d03de0 100644 --- a/fs/netfs/read_helper.c +++ b/fs/netfs/read_helper.c @@ -933,7 +933,7 @@ void netfs_readahead(struct readahead_control *ractl, EXPORT_SYMBOL(netfs_readahead); /** - * netfs_page - Helper to manage a readpage request + * netfs_readpage - Helper to manage a readpage request * @file: The file to read from * @page: The page to read * @ops: The network filesystem's operations for the helper to use @@ -968,7 +968,7 @@ int netfs_readpage(struct file *file, return -ENOMEM; } rreq->mapping = page_file_mapping(page); - rreq->start = page_index(page) * PAGE_SIZE; + rreq->start = page_file_offset(page); rreq->len = thp_size(page); if (ops->begin_cache_operation) { @@ -1106,7 +1106,7 @@ int netfs_write_begin(struct file *file, struct address_space *mapping, if (!rreq) goto error; rreq->mapping = page->mapping; - rreq->start = page->index * PAGE_SIZE; + rreq->start = page_offset(page); rreq->len = thp_size(page); rreq->no_unlock_page = page->index; __set_bit(NETFS_RREQ_NO_UNLOCK_PAGE, &rreq->flags);