[PATCH] blk_fs_request()

Add blk_fs_request(rq) to avoid testing rq->flags & REQ_CMD directly.

include/linux/blkdev.h

@@ -219,6 +219,7 @@ struct request_queue
 #define blk_queue_plugged(q)	!list_empty(&(q)->plug_list)
 #define blk_queue_tagged(q)	test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
 #define blk_queue_empty(q)	elv_queue_empty(q)
+#define blk_fs_request(rq)	((rq)->flags & REQ_CMD)
 #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
 
 #define rq_data_dir(rq)		((rq)->flags & 1)