From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754122Ab3KQLim (ORCPT ); Sun, 17 Nov 2013 06:38:42 -0500 Received: from mail-pa0-f52.google.com ([209.85.220.52]:43240 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754078Ab3KQLib (ORCPT ); Sun, 17 Nov 2013 06:38:31 -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 v2 4/5] fat: fallback to buffered write in case of fallocatded region on direct IO Date: Sun, 17 Nov 2013 20:38:23 +0900 Message-Id: <1384688303-2969-1-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 | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 12a37a9..c9fb9b6 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -217,6 +217,14 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, loff_t size = offset + iov_iter_count(iter); 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 > + round_up(i_size_read(inode), inode->i_sb->s_blocksize)) + return 0; } /* -- 1.7.9.5