block: implement and enforce request peek/start/fetch

[safe/jmp/linux-2.6] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index c755803..6e59d3b 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -818,8 +818,6 @@ static inline void blk_run_address_space(struct address_space *mapping)
                blk_run_backing_dev(mapping->backing_dev_info, NULL);
 }
 
-extern void blkdev_dequeue_request(struct request *req);
-
 /*
  * blk_rq_pos()                : the current sector
  * blk_rq_bytes()      : bytes left in the entire request
@@ -853,6 +851,13 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
 }
 
 /*
+ * Request issue related functions.
+ */
+extern struct request *blk_peek_request(struct request_queue *q);
+extern void blk_start_request(struct request *rq);
+extern struct request *blk_fetch_request(struct request_queue *q);
+
+/*
  * Request completion related functions.
  *
  * blk_update_request() completes given number of bytes and updates