Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933704AbcK2LeP (ORCPT ); Tue, 29 Nov 2016 06:34:15 -0500 Received: from mga06.intel.com ([134.134.136.31]:21031 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757238AbcK2LXh (ORCPT ); Tue, 29 Nov 2016 06:23:37 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,568,1473145200"; d="scan'208";a="1065622659" 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: [PATCHv5 19/36] fs: make block_page_mkwrite() aware about huge pages Date: Tue, 29 Nov 2016 14:22:47 +0300 Message-Id: <20161129112304.90056-20-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20161129112304.90056-1-kirill.shutemov@linux.intel.com> References: <20161129112304.90056-1-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1528 Lines: 46 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 7d333621ccfb..8e000021513c 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) -- 2.10.2