[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>
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 9f7fc39..e04c302 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -262,6 +262,28 @@
}
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 @@
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),
