jbd: Use offset_in_page() instead of manual calculation

Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
git-mirror · Oct 27, 2010 · 8117f98 · 8117f98
1 parent 2b23976
commit 8117f98
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
@@ -711,7 +711,7 @@ do_get_write_access(handle_t *handle, struct journal_head *jh,
 		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);
 		memcpy(jh->b_frozen_data, source+offset, jh2bh(jh)->b_size);
 		kunmap_atomic(source, KM_USER0);