1 files changed, 31 insertions, 0 deletions

diff --git a/block/genhd.c b/block/genhd.c
index 653919d50cd4..457fdac4c17d 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -417,6 +417,34 @@ static struct disk_attribute disk_attr_stat = {
         .show   = disk_stats_read
 };
 
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+
+static ssize_t disk_fail_store(struct gendisk * disk,
+                               const char *buf, size_t count)
+{
+        int i;
+
+        if (count > 0 && sscanf(buf, "%d", &i) > 0) {
+                if (i == 0)
+                        disk->flags &= ~GENHD_FL_FAIL;
+                else
+                        disk->flags |= GENHD_FL_FAIL;
+        }
+
+        return count;
+}
+static ssize_t disk_fail_read(struct gendisk * disk, char *page)
+{
+        return sprintf(page, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0);
+}
+static struct disk_attribute disk_attr_fail = {
+        .attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR },
+        .store  = disk_fail_store,
+        .show   = disk_fail_read
+};
+
+#endif
+
 static struct attribute * default_attrs[] = {
         &disk_attr_uevent.attr,
         &disk_attr_dev.attr,
@@ -424,6 +452,9 @@ static struct attribute * default_attrs[] = {
         &disk_attr_removable.attr,
         &disk_attr_size.attr,
         &disk_attr_stat.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+        &disk_attr_fail.attr,
+#endif
         NULL,
 };