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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>
This commit is contained in:
Martin K. Petersen 2009-05-23 11:43:38 -04:00 committed by James Bottomley
parent ea09bcc9c2
commit 3821d76891
1 changed files with 26 additions and 0 deletions
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26
drivers/scsi/sd.c
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@ -1794,6 +1794,29 @@ void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
return;
}
/**
* 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.
@ -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 " : "");
}