fs: have ll_rw_block users pass in op and flags separately

This has ll_rw_block users pass in the operation and flags separately,
so ll_rw_block can setup the bio op and bi_rw flags on the bio that
is submitted.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index d7cae33..3971146 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1819,7 +1819,7 @@
 	if (!buffer_dirty(*bh))
 		clear_buffer_uptodate(*bh);
 	unlock_buffer(*bh);
-	ll_rw_block(READ, 1, bh);
+	ll_rw_block(REQ_OP_READ, 0, 1, bh);
 	wait_on_buffer(*bh);
 	if (!buffer_uptodate(*bh)) {
 		mlog_errno(-EIO);