From patchwork Thu Jan 26 11:58:01 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: 9539071 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 9E4A2601D7 for ; Thu, 26 Jan 2017 12:05:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 95D0627D13 for ; Thu, 26 Jan 2017 12:05:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8AB9A28249; Thu, 26 Jan 2017 12:05:21 +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 13E8227D13 for ; Thu, 26 Jan 2017 12:05:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753799AbdAZMFC (ORCPT ); Thu, 26 Jan 2017 07:05:02 -0500 Received: from mga05.intel.com ([192.55.52.43]:60730 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753324AbdAZL7J (ORCPT ); Thu, 26 Jan 2017 06:59:09 -0500 Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga105.fm.intel.com with ESMTP; 26 Jan 2017 03:58:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,289,1477983600"; d="scan'208";a="926869318" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga003.jf.intel.com with ESMTP; 26 Jan 2017 03:58:42 -0800 Received: by black.fi.intel.com (Postfix, from userid 1000) id 138BE429; 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 19/37] fs: make block_page_mkwrite() aware about huge pages Date: Thu, 26 Jan 2017 14:58:01 +0300 Message-Id: <20170126115819.58875-20-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-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 d05524f14846..17167b299d0f 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2544,7 +2544,7 @@ 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; @@ -2552,7 +2552,7 @@ 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; @@ -2560,10 +2560,10 @@ 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)