From patchwork Thu Jan 26 11:58:08 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A . Shutemov" X-Patchwork-Id: 9539121 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 16822601D7 for ; Thu, 26 Jan 2017 12:07:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0DDEC26E91 for ; Thu, 26 Jan 2017 12:07:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 024212818E; Thu, 26 Jan 2017 12:07:36 +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 E8DE227D13 for ; Thu, 26 Jan 2017 12:07:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753517AbdAZMHM (ORCPT ); Thu, 26 Jan 2017 07:07:12 -0500 Received: from mga01.intel.com ([192.55.52.88]:31179 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752961AbdAZL66 (ORCPT ); Thu, 26 Jan 2017 06:58:58 -0500 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga101.fm.intel.com with ESMTP; 26 Jan 2017 03:58:51 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,289,1477983600"; d="scan'208";a="217875210" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga004.fm.intel.com with ESMTP; 26 Jan 2017 03:58:47 -0800 Received: by black.fi.intel.com (Postfix, from userid 1000) id 66F49522; Thu, 26 Jan 2017 13:58:26 +0200 (EET) From: "Kirill A. Shutemov" To: "Theodore Ts'o" , Andreas Dilger , Jan Kara , Andrew Morton Cc: Alexander Viro , Hugh Dickins , Andrea Arcangeli , 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: [PATCHv6 26/37] ext4: handle huge pages in ext4_page_mkwrite() Date: Thu, 26 Jan 2017 14:58:08 +0300 Message-Id: <20170126115819.58875-27-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170126115819.58875-1-kirill.shutemov@linux.intel.com> References: <20170126115819.58875-1-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 | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 8d1b5e63cb15..a25be1cf4506 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5778,7 +5778,7 @@ 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; @@ -5814,10 +5814,10 @@ 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 @@ -5848,7 +5848,8 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) ret = block_page_mkwrite(vma, vmf, get_block); if (!ret && ext4_should_journal_data(inode)) { if (ext4_walk_page_buffers(handle, page_buffers(page), 0, - PAGE_SIZE, NULL, do_journal_get_write_access)) { + hpage_size(page), NULL, + do_journal_get_write_access)) { unlock_page(page); ret = VM_FAULT_SIGBUS; ext4_journal_stop(handle);