On Thu, 30 Jan 2014, James Bottomley wrote:

quoted

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

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