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udf: Use device size when drive reported bogus number of written blocks

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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>
This commit is contained in:
Jan Kara 2009-06-18 12:33:16 +02:00
parent 1d89b30cc9
commit 24a5d59f34
1 changed files with 6 additions and 1 deletions
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7
fs/udf/lowlevel.c
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@ -56,7 +56,12 @@ unsigned long udf_get_last_block(struct super_block *sb)
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)