Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754472Ab3IKLAs (ORCPT ); Wed, 11 Sep 2013 07:00:48 -0400 Received: from mail-pb0-f52.google.com ([209.85.160.52]:49905 "EHLO mail-pb0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754400Ab3IKLAp (ORCPT ); Wed, 11 Sep 2013 07:00:45 -0400 Date: Wed, 11 Sep 2013 19:00:34 +0800 From: majianpeng To: axboe , viro Cc: linux-fsdevel , LKML Reply-To: majianpeng Subject: [PATCH 2/2] block_dev: Add size check before doing async write on block device. X-Priority: 3 X-GUID: AF3F4965-20D3-4453-BED0-EB197C91FFF8 X-Has-Attach: no X-Mailer: Foxmail 7.0.1.93[cn] Mime-Version: 1.0 Message-ID: <201309111900317069315@gmail.com> Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id r8BB0w5r004175 Content-Length: 856 Lines: 27 For async-write on block device,when disk removed,the vfs don't know. It will continue do async-write.Add this check it will stop async-write when disk removed. Signed-off-by: Jianpeng Ma --- fs/block_dev.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/block_dev.c b/fs/block_dev.c index 1173a4e..e308b52 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1514,6 +1514,10 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, struct file *file = iocb->ki_filp; struct blk_plug plug; ssize_t ret; + loff_t size = i_size_read(file->f_mapping->host); + + if (pos >= size) + return 0; BUG_ON(iocb->ki_pos != pos); -- 1.8.4-rc0 ????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay?ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?