The direct-io code currently returns -EIO if someone tries to read past the
end of a block device.  Change it to shorten the read and to return the
number of bytes which were actually read.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>