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

[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 <martin.petersen@oracle.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 8c579ab6

drivers/scsi/sd.c

+24 −1
Original line number Diff line number Diff line
@@ -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),