[SCSI] sd: Export effective protection mode in sysfs

Create a sysfs entry that reports the negotiated DIX/DIF protection mode
for a SCSI disk. This depends on the protection type the disk is
formatted with as well as the protection capabilities advertised by the
controller.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 57d1e3e1bd4478548f89ef9f3a472ee4418c71b3..b9ab3a590e4b4fd891865a1f9d3d5f3cb55d9dc5 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -258,6 +258,28 @@ sd_show_protection_type(struct device *dev, struct device_attribute *attr,
        return snprintf(buf, 20, "%u\n", sdkp->protection_type);
 }
 
+static ssize_t
+sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
+                       char *buf)
+{
+       struct scsi_disk *sdkp = to_scsi_disk(dev);
+       struct scsi_device *sdp = sdkp->device;
+       unsigned int dif, dix;
+
+       dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
+       dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
+
+       if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
+               dif = 0;
+               dix = 1;
+       }
+
+       if (!dif && !dix)
+               return snprintf(buf, 20, "none\n");
+
+       return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
+}
+
 static ssize_t
 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
                    char *buf)
@@ -285,6 +307,7 @@ static struct device_attribute sd_disk_attrs[] = {
        __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_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),
        __ATTR_NULL,