md: expose the degraded status of an assembled array through sysfs

[deliverable/linux.git] / drivers / md / md.c

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 510625e3a965b26b59ef66a5578441f44ece1f8e..c059ae6f37e5ae1fe789e3fad66ad0a91da3a264 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2833,6 +2833,12 @@ sync_max_store(mddev_t *mddev, const char *buf, size_t len)
 static struct md_sysfs_entry md_sync_max =
 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
 
+static ssize_t
+degraded_show(mddev_t *mddev, char *page)
+{
+       return sprintf(page, "%d\n", mddev->degraded);
+}
+static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
 
 static ssize_t
 sync_speed_show(mddev_t *mddev, char *page)
@@ -2976,6 +2982,7 @@ static struct attribute *md_redundancy_attrs[] = {
        &md_suspend_lo.attr,
        &md_suspend_hi.attr,
        &md_bitmap.attr,
+       &md_degraded.attr,
        NULL,
 };
 static struct attribute_group md_redundancy_group = {