ocfs2: Make cached block reads the common case.

ocfs2_read_blocks() currently requires the CACHED flag for cached I/O.
However, that's the common case.  Let's flip it around and provide an
IGNORE_CACHE flag for the special users.  This has the added benefit of
cleaning up the code some (ignore_cache takes on its special meaning
earlier in the loop).

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

fs/ocfs2/dir.c

@@ -88,7 +88,7 @@ static struct buffer_head *ocfs2_bread(struct inode *inode,
 	struct buffer_head *bh = NULL;
 	int tmperr;
 	u64 p_blkno;
-	int readflags = OCFS2_BH_CACHED;
+	int readflags = 0;
 
 	if (reada)
 		readflags |= OCFS2_BH_READAHEAD;