[dm-devel] [PATCH] block devices: validate block device capacity

[Mikulas Patocka]

On Thu, 30 Jan 2014, James Bottomley wrote:

> > So, if you want 64-bit page offsets, you need to increase pgoff_t size, 
> > and that will increase the limit for both files and block devices.
> 
> No.  The point is the page cache mapping of the device uses a
> manufactured inode saved in the backing device. It looks fixable in the
> buffer code before the page cache gets involved.

So if you think you can support 16TiB devices and leave pgoff_t 32-bit, 
send a patch that does it.

Until you make it, you should apply the patch that I sent, that prevents 
kernel lockups or data corruption when the user uses 16TiB device on 
32-bit kernel.

Mikulas