[PATCH] Split struct request ->flags into two parts

Right now ->flags is a bit of a mess: some are request types, and
others are just modifiers. Clean this up by splitting it into
->cmd_type and ->cmd_flags. This allows introduction of generic
Linux block message types, useful for sending generic Linux commands
to block devices.

Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 451b996..42891d2 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -365,16 +365,16 @@
 	rq->sense = sense;
 	memset(sense, 0, sizeof(sense));
 	rq->sense_len = 0;
-	rq->flags |= REQ_BLOCK_PC | REQ_HARDBARRIER;
+	rq->cmd_type = REQ_TYPE_BLOCK_PC;
+	rq->cmd_flags |= REQ_HARDBARRIER;
 	if (cgc->quiet)
-		rq->flags |= REQ_QUIET;
+		rq->cmd_flags |= REQ_QUIET;
 	memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
 	if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
 		memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
 	rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
 
 	rq->ref_count++;
-	rq->flags |= REQ_NOMERGE;
 	rq->waiting = &wait;
 	rq->end_io = blk_end_sync_rq;
 	elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1);