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    Subject[patch 10/24] udf: Use device size when drive reported bogus number of written blocks
    2.6.30-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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