diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2009-05-23 11:43:38 -0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-06-21 10:52:38 -0500 |
| commit | 3821d768912a47ddbd6cab52943a8284df88003c (patch) | |
| tree | f4097861eae7aa84b8accf2a2da34d173207c8a0 /drivers/scsi/sd.c | |
| parent | ea09bcc9c298d3057270abd78a973fc678d55c4c (diff) | |
sd: Detect non-rotational devices
Detect non-rotational devices and set the queue flag accordingly.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index a86064b6458d..2148d659c281 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1795,6 +1795,29 @@ void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) } /** + * sd_read_block_characteristics - Query block dev. characteristics + * @disk: disk to query + */ +static void sd_read_block_characteristics(struct scsi_disk *sdkp) +{ + char *buffer; + u16 rot; + + /* Block Device Characteristics VPD */ + buffer = scsi_get_vpd_page(sdkp->device, 0xb1); + + if (buffer == NULL) + return; + + rot = get_unaligned_be16(&buffer[4]); + + if (rot == 1) + queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); + + kfree(buffer); +} + +/** * sd_revalidate_disk - called the first time a new disk is seen, * performs disk spin up, read_capacity, etc. * @disk: struct gendisk we care about @@ -1831,6 +1854,7 @@ static int sd_revalidate_disk(struct gendisk *disk) */ if (sdkp->media_present) { sd_read_capacity(sdkp, buffer); + sd_read_block_characteristics(sdkp); sd_read_write_protect_flag(sdkp, buffer); sd_read_cache_type(sdkp, buffer); sd_read_app_tag_own(sdkp, buffer); @@ -1953,6 +1977,8 @@ static void sd_probe_async(void *data, async_cookie_t cookie) add_disk(gd); sd_dif_config_host(sdkp); + sd_revalidate_disk(gd); + sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", sdp->removable ? "removable " : ""); } |