On 01/27/2016 07:13 PM, Greg KH wrote:

On Wed, Jan 27, 2016 at 12:38:14PM +0200, Avi Kivity wrote:

quoted

On 11/19/2015 10:25 PM, Jan Kara wrote:

quoted

Assume a filesystem with 4KB blocks. When a file has size 1000 bytes and
we issue direct IO read at offset 1024, blockdev_direct_IO() reads the
tail of the last block and the logic for handling short DIO reads in
dio_complete() results in a return value -24 (1000 - 1024) which
obviously confuses userspace.

Fix the problem by bailing out early once we sample i_size and can
reliably check that direct IO read starts beyond i_size.

Reported-by: Avi Kivity <redacted>
Fixes: 9fe55eea7e4b444bafc42fa0000cc2d1d2847275
CC: stable@vger.kernel.org

While this patch made it into upstream, it did not appear in 4.3.4. Did it
slip through the proverbial cracks?  Can it be queued for 4.3.5?

There are over 400 patches right now in my queue that haven't made it
into a 4.3.x kernel.

Many projects would consider 400 patches a major release, and here they 
are behind two dots...

   These are in the queue, in good company :)

I'll go dig these out as I guess people care about them more than
others...

Much appreciated.