Kill REQ_TYPE_FLUSH

It was only used by ps3disk, and it should probably have been
REQ_TYPE_LINUX_BLOCK + REQ_LB_OP_FLUSH.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index d797e20..4b0d6c7 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -199,7 +199,8 @@
 		if (blk_fs_request(req)) {
 			if (ps3disk_submit_request_sg(dev, req))
 				break;
-		} else if (req->cmd_type == REQ_TYPE_FLUSH) {
+		} else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
+			   req->cmd[0] == REQ_LB_OP_FLUSH) {
 			if (ps3disk_submit_flush_request(dev, req))
 				break;
 		} else {
@@ -257,7 +258,8 @@
 		return IRQ_HANDLED;
 	}
 
-	if (req->cmd_type == REQ_TYPE_FLUSH) {
+	if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
+	    req->cmd[0] == REQ_LB_OP_FLUSH) {
 		read = 0;
 		num_sectors = req->hard_cur_sectors;
 		op = "flush";
@@ -405,7 +407,8 @@
 
 	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 
-	req->cmd_type = REQ_TYPE_FLUSH;
+	req->cmd_type = REQ_TYPE_LINUX_BLOCK;
+	req->cmd[0] = REQ_LB_OP_FLUSH;
 }
 
 static unsigned long ps3disk_mask;