From patchwork Tue Jul 26 00:35:25 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: 9247347 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 98DF260869 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 85C0B2787C for ; Tue, 26 Jul 2016 00:42:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7A7671FF21; 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 2B42A27B81 for ; Tue, 26 Jul 2016 00:42:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755925AbcGZAgr (ORCPT ); Mon, 25 Jul 2016 20:36:47 -0400 Received: from mga09.intel.com ([134.134.136.24]:32535 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755290AbcGZAgM (ORCPT ); Mon, 25 Jul 2016 20:36:12 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) 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="145359369" Received: from black.fi.intel.com ([10.237.72.93]) by fmsmga004.fm.intel.com with ESMTP; 25 Jul 2016 17:35:57 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id C4AC2A17; 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 23/33] fs: make block_page_mkwrite() aware about huge pages Date: Tue, 26 Jul 2016 03:35:25 +0300 Message-Id: <1469493335-3622-24-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-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Adjust check on whether part of the page beyond file size and apply compound_head() and page_mapping() where appropriate. Signed-off-by: Kirill A. Shutemov --- fs/buffer.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index edd0971f9f95..2e25d0e7a233 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2502,7 +2502,7 @@ EXPORT_SYMBOL(block_commit_write); int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, get_block_t get_block) { - struct page *page = vmf->page; + struct page *page = compound_head(vmf->page); struct inode *inode = file_inode(vma->vm_file); unsigned long end; loff_t size; @@ -2510,7 +2510,7 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, lock_page(page); size = i_size_read(inode); - if ((page->mapping != inode->i_mapping) || + if ((page_mapping(page) != inode->i_mapping) || (page_offset(page) > size)) { /* We overload EFAULT to mean page got truncated */ ret = -EFAULT; @@ -2518,10 +2518,10 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, } /* page is wholly or partially inside EOF */ - if (((page->index + 1) << PAGE_SHIFT) > size) - end = size & ~PAGE_MASK; + if (((page->index + hpage_nr_pages(page)) << PAGE_SHIFT) > size) + end = size & ~hpage_mask(page); else - end = PAGE_SIZE; + end = hpage_size(page); ret = __block_write_begin(page, 0, end, get_block); if (!ret)