From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757409AbZIPWSh (ORCPT ); Wed, 16 Sep 2009 18:18:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757024AbZIPWSf (ORCPT ); Wed, 16 Sep 2009 18:18:35 -0400 Received: from kroah.org ([198.145.64.141]:49794 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756929AbZIPWSb (ORCPT ); Wed, 16 Sep 2009 18:18:31 -0400 X-Mailbox-Line: From gregkh@mini.kroah.org Wed Sep 16 15:15:06 2009 Message-Id: <20090916221506.226614681@mini.kroah.org> User-Agent: quilt/0.48-1 Date: Wed, 16 Sep 2009 15:13:24 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Jan Kara Subject: [patch 04/10] udf: Use device size when drive reported bogus number of written blocks References: <20090916221320.283781925@mini.kroah.org> Content-Disposition: inline; filename=udf-use-device-size-when-drive-reported-bogus-number-of-written-blocks.patch In-Reply-To: <20090916221529.GA28162@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Jan Kara commit 24a5d59f3477bcff4c069ff4d0ca9a3e037d0235 upstream. Some drives report 0 as the number of written blocks when there are some blocks recorded. Use device size in such case so that we can automagically mount such media. Signed-off-by: Jan Kara Signed-off-by: Greg Kroah-Hartman --- fs/udf/lowlevel.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/fs/udf/lowlevel.c +++ b/fs/udf/lowlevel.c @@ -56,7 +56,12 @@ unsigned long udf_get_last_block(struct struct block_device *bdev = sb->s_bdev; unsigned long lblock = 0; - if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock)) + /* + * ioctl failed or returned obviously bogus value? + * Try using the device size... + */ + if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock) || + lblock == 0) lblock = bdev->bd_inode->i_size >> sb->s_blocksize_bits; if (lblock)