From: Andrew Morton <akpm@linux-foundation.org>

Revert

commit 37529fe9f62835e1c11895a1895064748b032dc1
Author: Lai Jiangshan <laijs@cn.fujitsu.com>
Date:   Wed Mar 26 12:01:28 2008 +0100

    set relay file can not be read by pread(2)
    
    I found that relay files can be read by pread(2). I fix it,
    for relay files are not capable of seeking.
    
    Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
    Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

as it will break any existing apps which are using pread() against relayfs
files.  This presently works OK as long as the offset is zero, so there may be
such apps out there.

Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/relay.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN kernel/relay.c~revert-set-relay-file-can-not-be-read-by-pread2 kernel/relay.c
--- a/kernel/relay.c~revert-set-relay-file-can-not-be-read-by-pread2
+++ a/kernel/relay.c
@@ -736,7 +736,7 @@ static int relay_file_open(struct inode 
 	kref_get(&buf->kref);
 	filp->private_data = buf;
 
-	return nonseekable_open(inode, filp);
+	return 0;
 }
 
 /**
_