Messages in this thread Patch in this message | | | Date | Wed, 16 Sep 2009 15:13:24 -0700 | From | Greg KH <> | Subject | [patch 04/10] udf: Use device size when drive reported bogus number of written blocks |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
------------------ From: Jan Kara <jack@suse.cz>
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 <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- 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)
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