Re: [PATCH] direct-io: Fix negative return from dio read beyond eof

[Greg KH <greg@kroah.com>]

On Wed, Jan 27, 2016 at 12:38:14PM +0200, Avi Kivity wrote:
> On 11/19/2015 10:25 PM, Jan Kara wrote:
> >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 <avi@scylladb.com>
> >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.  These are in the queue, in good company :)

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

thanks,

greg k-h