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[SCSI] sd: Allow protection_type to be overridden 

We have encountered a few devices that misbehaved when operating in T10
PI mode. Allow T10 PI protection type to be overridden from userland.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Martin K. Petersen 2012-08-28 14:29:34 -04:00 committed by James Bottomley
parent 8c579ab69d
commit 8172499aae
1 changed files with 24 additions and 1 deletions
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25
drivers/scsi/sd.c
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@ -261,6 +261,28 @@ sd_show_protection_type(struct device *dev, struct device_attribute *attr,
return snprintf(buf, 20, "%u\n", sdkp->protection_type);
}
static ssize_t
sd_store_protection_type(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
unsigned int val;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
err = kstrtouint(buf, 10, &val);
if (err)
return err;
if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
sdkp->protection_type = val;
return count;
}
static ssize_t
sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
char *buf)
@ -381,7 +403,8 @@ static struct device_attribute sd_disk_attrs[] = {
sd_store_allow_restart),
__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
sd_store_manage_start_stop),
__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
__ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
sd_store_protection_type),
__ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
__ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),