From patchwork Tue Jul 26 00:35:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A . Shutemov" X-Patchwork-Id: 9247345 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 765AA6077C for ; Tue, 26 Jul 2016 00:42:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 66F262787C for ; Tue, 26 Jul 2016 00:42:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5B8801FF15; Tue, 26 Jul 2016 00:42:33 +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=ham 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 09BA51FF21 for ; Tue, 26 Jul 2016 00:42:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755511AbcGZAgq (ORCPT ); Mon, 25 Jul 2016 20:36:46 -0400 Received: from mga09.intel.com ([134.134.136.24]:61482 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755512AbcGZAgM (ORCPT ); Mon, 25 Jul 2016 20:36:12 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP; 25 Jul 2016 17:36:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,421,1464678000"; d="scan'208";a="1002393746" Received: from black.fi.intel.com ([10.237.72.93]) by orsmga001.jf.intel.com with ESMTP; 25 Jul 2016 17:35:58 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id F3C36B2D; Tue, 26 Jul 2016 03:35:47 +0300 (EEST) From: "Kirill A. Shutemov" To: "Theodore Ts'o" , Andreas Dilger , Jan Kara Cc: Alexander Viro , Hugh Dickins , Andrea Arcangeli , Andrew Morton , Dave Hansen , Vlastimil Babka , Matthew Wilcox , Ross Zwisler , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv1, RFC 27/33] ext4: handle huge pages in ext4_page_mkwrite() Date: Tue, 26 Jul 2016 03:35:29 +0300 Message-Id: <1469493335-3622-28-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1469493335-3622-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1469493335-3622-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Trivial: remove assumption on page size. Signed-off-by: Kirill A. Shutemov --- fs/ext4/inode.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index f585f9160a96..45822097d8c2 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5646,7 +5646,7 @@ static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh) int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) { - struct page *page = vmf->page; + struct page *page = compound_head(vmf->page); loff_t size; unsigned long len; int ret; @@ -5682,10 +5682,10 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) goto out; } - if (page->index == size >> PAGE_SHIFT) - len = size & ~PAGE_MASK; - else - len = PAGE_SIZE; + len = hpage_size(page); + if (page->index + hpage_nr_pages(page) - 1 == size >> PAGE_SHIFT) + len = size & ~hpage_mask(page); + /* * Return if we have all the buffers mapped. This avoids the need to do * journal_start/journal_stop which can block and take a long time