From patchwork Wed Apr 4 19:17:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jerome Glisse X-Patchwork-Id: 10323283 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 496466032A for ; Wed, 4 Apr 2018 19:31:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3BA6128F56 for ; Wed, 4 Apr 2018 19:31:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2FCA828F65; Wed, 4 Apr 2018 19:31:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B47A728F56 for ; Wed, 4 Apr 2018 19:31:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752303AbeDDTbP (ORCPT ); Wed, 4 Apr 2018 15:31:15 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:35162 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751562AbeDDTTD (ORCPT ); Wed, 4 Apr 2018 15:19:03 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4E31AEB6FF; Wed, 4 Apr 2018 19:19:02 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-125-89.rdu2.redhat.com [10.10.125.89]) by smtp.corp.redhat.com (Postfix) with ESMTP id 925F694585; Wed, 4 Apr 2018 19:19:01 +0000 (UTC) From: jglisse@redhat.com To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Andrew Morton , Alexander Viro , Tejun Heo , Jan Kara , Josef Bacik , Mel Gorman Subject: [RFC PATCH 07/79] mm/page: add helpers to find mapping give a page and buffer head Date: Wed, 4 Apr 2018 15:17:54 -0400 Message-Id: <20180404191831.5378-5-jglisse@redhat.com> In-Reply-To: <20180404191831.5378-1-jglisse@redhat.com> References: <20180404191831.5378-1-jglisse@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.1]); Wed, 04 Apr 2018 19:19:02 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.1]); Wed, 04 Apr 2018 19:19:02 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'jglisse@redhat.com' RCPT:'' Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Jérôme Glisse For now this simply use exist page_mapping() inline. Latter it will use buffer head pointer as a key to lookup mapping for write protected page. Signed-off-by: Jérôme Glisse Cc: linux-mm@kvack.org CC: Andrew Morton Cc: Alexander Viro Cc: linux-fsdevel@vger.kernel.org Cc: Tejun Heo Cc: Jan Kara Cc: Josef Bacik Cc: Mel Gorman --- include/linux/mm-page.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/mm-page.h b/include/linux/mm-page.h index 2981db45eeef..647a8a8cf9ba 100644 --- a/include/linux/mm-page.h +++ b/include/linux/mm-page.h @@ -132,5 +132,17 @@ static inline unsigned long _page_file_offset(struct page *page, return page->index << PAGE_SHIFT; } +/* + * fs_page_mapping_get_with_bh() - page mapping knowing buffer_head + * @page: page struct pointer for which we want the mapping + * @bh: buffer_head associated with the page for the mapping + * Returns: page mapping for the given buffer head + */ +static inline struct address_space *fs_page_mapping_get_with_bh( + struct page *page, struct buffer_head *bh) +{ + return page_mapping(page); +} + #endif /* MM_PAGE_H */ #endif /* DOT_NOT_INCLUDE___INSIDE_MM */