From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752234Ab3LYGbu (ORCPT ); Wed, 25 Dec 2013 01:31:50 -0500 Received: from mail-pd0-f169.google.com ([209.85.192.169]:58185 "EHLO mail-pd0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751826Ab3LYGbr (ORCPT ); Wed, 25 Dec 2013 01:31:47 -0500 From: Namjae Jeon To: hirofumi@mail.parknet.co.jp, akpm@linux-foundation.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Namjae Jeon , Namjae Jeon , Amit Sahrawat Subject: [PATCH v3 4/6] fat: fallback to buffered write in case of fallocated region on direct IO Date: Wed, 25 Dec 2013 15:31:37 +0900 Message-Id: <1387953097-2794-1-git-send-email-linkinjeon@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Namjae Jeon For normal cases of direct IO write, trying to seek to location greater than file size, makes it fall back to buffered write to fill that region. Similarly, in case for write in Fallocated region, make it fall to buffered write. Signed-off-by: Namjae Jeon Signed-off-by: Amit Sahrawat --- fs/fat/inode.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 8415807..3636617 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -229,6 +229,13 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, loff_t size = offset + iov_length(iov, nr_segs); if (MSDOS_I(inode)->mmu_private < size) return 0; + + /* + * In case of writing in fallocated region, return 0 and + * fallback to buffered write. + */ + if (MSDOS_I(inode)->i_disksize > MSDOS_I(inode)->mmu_private) + return 0; } /* -- 1.7.9.5