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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-09-24 13:03:33 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-10-09 08:56:19 +0200 |
| commit | a68bbddba486020c9c74825ce90c4c1ec463e0e8 (patch) | |
| tree | ce0acea1e609185968310316d3d1ac6f730db983 /include/linux/blkdev.h | |
| parent | 9e49184c82e9ec3ab4d45f9ea5a17ccaf43869f0 (diff) | |
| download | lwn-a68bbddba486020c9c74825ce90c4c1ec463e0e8.tar.gz lwn-a68bbddba486020c9c74825ce90c4c1ec463e0e8.zip | |
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.h | 2 |
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) |