summaryrefslogtreecommitdiff
path: root/include/linux/blkdev.h
diff options
context:
space:
mode:
authorJens Axboe <jens.axboe@oracle.com>2008-09-24 15:03:33 +0400
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 10:56:19 +0400
commita68bbddba486020c9c74825ce90c4c1ec463e0e8 (patch)
treece0acea1e609185968310316d3d1ac6f730db983 /include/linux/blkdev.h
parent9e49184c82e9ec3ab4d45f9ea5a17ccaf43869f0 (diff)
downloadlinux-a68bbddba486020c9c74825ce90c4c1ec463e0e8.tar.xz
block: add queue flag for SSD/non-rotational devices
We don't want to idle in AS/CFQ if the device doesn't have a seek penalty. So add a QUEUE_FLAG_NONROT to indicate a non-rotational device, low level drivers should set this flag upon discovery of an SSD or similar device type. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 86f77ef127f4..0cf3e619fb21 100644
--- 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)