From a1dd53318409ed6a27a8ce4fecf52e1326a100c0 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Sat, 18 Dec 2010 13:13:40 -0500
Subject: jbd2: use offset_in_page() instead of manual calculation

This is a port to jbd2 of a patch which Namhyung Kim <namhyung@gmail.com>
originally made to fs/jbd.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
 fs/jbd2/transaction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'fs/jbd2')

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 10b5e3b1ca8b..80f9b2a3880b 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -774,7 +774,7 @@ done:
 		J_EXPECT_JH(jh, buffer_uptodate(jh2bh(jh)),
 			    "Possible IO failure.\n");
 		page = jh2bh(jh)->b_page;
-		offset = ((unsigned long) jh2bh(jh)->b_data) & ~PAGE_MASK;
+		offset = offset_in_page(jh2bh(jh)->b_data);
 		source = kmap_atomic(page, KM_USER0);
 		/* Fire data frozen trigger just before we copy the data */
 		jbd2_buffer_frozen_trigger(jh, source + offset,
-- 
cgit v1.2.2