block: add queue flag for SSD/non-rotational devices

[h-e-n] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 86f77ef..0cf3e61 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -442,6 +442,7 @@ struct request_queue
 #define QUEUE_FLAG_SAME_COMP   11      /* force complete on same CPU */
 #define QUEUE_FLAG_FAIL_IO     12      /* fake timeout */
 #define QUEUE_FLAG_STACKABLE   13      /* supports request stacking */
+#define QUEUE_FLAG_NONROT      14      /* non-rotational device (SSD) */
 
 static inline int queue_is_locked(struct request_queue *q)
 {
@@ -547,6 +548,7 @@ enum {
 #define blk_queue_tagged(q)    test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
 #define blk_queue_stopped(q)   test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
 #define blk_queue_nomerges(q)  test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
+#define blk_queue_nonrot(q)    test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
 #define blk_queue_flushing(q)  ((q)->ordseq)
 #define blk_queue_stackable(q) \
        test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)