From: Gerald Schaefer <geraldsc@de.ibm.com>

 - Use nonseekable_open() to disable seeking and pread()/pwrite().
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>