From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755492Ab3JIOlQ (ORCPT ); Wed, 9 Oct 2013 10:41:16 -0400 Received: from mail-pd0-f181.google.com ([209.85.192.181]:33372 "EHLO mail-pd0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755441Ab3JIOlO (ORCPT ); Wed, 9 Oct 2013 10:41:14 -0400 From: Namjae Jeon To: hirofumi@mail.parknet.co.jp, akpm@linux-foundation.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, a.sahrawat@samsung.com, Namjae Jeon , Namjae Jeon Subject: [PATCH 4/5] fat: fallback to buffered write in case of fallocatded region on direct IO Date: Wed, 9 Oct 2013 23:41:04 +0900 Message-Id: <1381329664-11939-1-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 2f2a265..1e71ead 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