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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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