block: add sysfs knob for turning off disk entropy contributions

[linux-block.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 09a840264d6fdf54b0170970eb9c3c49acc9def6..b8224ea4a5def9db02b2e3a827f6eb10551c9b17 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -467,11 +467,13 @@ struct request_queue
 #define QUEUE_FLAG_IO_STAT     15      /* do IO stats */
 #define QUEUE_FLAG_DISCARD     16      /* supports DISCARD */
 #define QUEUE_FLAG_NOXMERGES   17      /* No extended merges */
+#define QUEUE_FLAG_ADD_RANDOM  18      /* Contributes to random pool */
 
 #define QUEUE_FLAG_DEFAULT     ((1 << QUEUE_FLAG_IO_STAT) |            \
                                 (1 << QUEUE_FLAG_CLUSTER) |            \
                                 (1 << QUEUE_FLAG_STACKABLE)    |       \
-                                (1 << QUEUE_FLAG_SAME_COMP))
+                                (1 << QUEUE_FLAG_SAME_COMP)    |       \
+                                (1 << QUEUE_FLAG_ADD_RANDOM))
 
 static inline int queue_is_locked(struct request_queue *q)
 {
@@ -596,6 +598,7 @@ enum {
        test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
 #define blk_queue_nonrot(q)    test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
 #define blk_queue_io_stat(q)   test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
+#define blk_queue_add_random(q)        test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
 #define blk_queue_flushing(q)  ((q)->ordseq)
 #define blk_queue_stackable(q) \
        test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)