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>
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 3ea740d..687b287 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -249,7 +249,7 @@
 	}
 
 	status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1,
-				   &alloc_bh, 0);
+				   &alloc_bh, OCFS2_BH_IGNORE_CACHE);
 	if (status < 0) {
 		mlog_errno(status);
 		goto bail;
@@ -460,7 +460,7 @@
 	mutex_lock(&inode->i_mutex);
 
 	status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1,
-				   &alloc_bh, 0);
+				   &alloc_bh, OCFS2_BH_IGNORE_CACHE);
 	if (status < 0) {
 		mlog_errno(status);
 		goto bail;