block: Export I/O topology for block devices and partitions
[linux-2.6.git] / block / genhd.c
index 1a4916e..fe7ccc0 100644 (file)
@@ -852,11 +852,21 @@ static ssize_t disk_capability_show(struct device *dev,
        return sprintf(buf, "%x\n", disk->flags);
 }
 
+static ssize_t disk_alignment_offset_show(struct device *dev,
+                                         struct device_attribute *attr,
+                                         char *buf)
+{
+       struct gendisk *disk = dev_to_disk(dev);
+
+       return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue));
+}
+
 static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
 static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL);
 static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL);
 static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL);
 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
+static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL);
 static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL);
 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
 #ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -875,6 +885,7 @@ static struct attribute *disk_attrs[] = {
        &dev_attr_removable.attr,
        &dev_attr_ro.attr,
        &dev_attr_size.attr,
+       &dev_attr_alignment_offset.attr,
        &dev_attr_capability.attr,
        &dev_attr_stat.attr,
 #ifdef CONFIG_FAIL_MAKE_REQUEST