# Re: Kernel 3.3.8 breaks accidental ext3 mount of extended partition

- From: Jeff Moyer \<hidden\>
- Date: 2012-06-22 12:33:45 
- List: linux-ext4
- Page: https://ratatoskr.run/linux-ext4/2012/06/3883393
- Thread: https://ratatoskr.run/linux-ext4/2012/06/3883393/t.md

```text
Jan Kara [ref] writes:

>   I think it can have something to do with the fact that the partition size
> is not a multiple of 4k (i.e. expected block size)?

Ahh, yes.  Except that ext3 sets the blocksize to 1k by default.
However, I still can't explain why we don't get an error attempting to
access beyond the end of the device.  I'll keep digging on that.

>   BTW: blkdev_max_block() is a terrible name for something that intends to
> return size in blocks...

Fully agreed here, and I'll fix that up when I get my head completely
wrapped around this one.

Thanks for taking a look, Jan!

-Jeff
```