Commit 8172499a authored by Martin K. Petersen's avatar Martin K. Petersen Committed by James Bottomley

[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: default avatarMartin K. Petersen <>
Signed-off-by: default avatarJames Bottomley <>
parent 8c579ab6
......@@ -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[] = {
__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
__ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_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),
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment