diff --git a/Documentation/block/capability.txt b/Documentation/block/capability.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2f1729424ef49a10dbbe7451395054cabca4584a
--- /dev/null
+++ b/Documentation/block/capability.txt
@@ -0,0 +1,15 @@
+Generic Block Device Capability
+===============================================================================
+This file documents the sysfs file block/<disk>/capability
+
+capability is a hex word indicating which capabilities a specific disk
+supports.  For more information on bits not listed here, see
+include/linux/genhd.h
+
+Capability				Value
+-------------------------------------------------------------------------------
+GENHD_FL_MEDIA_CHANGE_NOTIFY		4
+	When this bit is set, the disk supports Asynchronous Notification
+	of media change events.  These events will be broadcast to user
+	space via kernel uevent.
+
diff --git a/block/genhd.c b/block/genhd.c
index 93a2cf654597c25502da7fb128745c11c01581c9..7efa8bb25da931af28e98d4040dc2f5ca2d26535 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -423,7 +423,10 @@ static ssize_t disk_size_read(struct gendisk * disk, char *page)
 {
 	return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk));
 }
-
+static ssize_t disk_capability_read(struct gendisk *disk, char *page)
+{
+	return sprintf(page, "%x\n", disk->flags);
+}
 static ssize_t disk_stats_read(struct gendisk * disk, char *page)
 {
 	preempt_disable();
@@ -466,6 +469,10 @@ static struct disk_attribute disk_attr_size = {
 	.attr = {.name = "size", .mode = S_IRUGO },
 	.show	= disk_size_read
 };
+static struct disk_attribute disk_attr_capability = {
+	.attr = {.name = "capability", .mode = S_IRUGO },
+	.show	= disk_capability_read
+};
 static struct disk_attribute disk_attr_stat = {
 	.attr = {.name = "stat", .mode = S_IRUGO },
 	.show	= disk_stats_read
@@ -506,6 +513,7 @@ static struct attribute * default_attrs[] = {
 	&disk_attr_removable.attr,
 	&disk_attr_size.attr,
 	&disk_attr_stat.attr,
+	&disk_attr_capability.attr,
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 	&disk_attr_fail.attr,
 #endif
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 4c03ee353e78684f64fd230101c7eab150860d79..3fcfed2168a770bf2a96aa11c528c998687e2f98 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -94,6 +94,7 @@ struct hd_struct {
 
 #define GENHD_FL_REMOVABLE			1
 #define GENHD_FL_DRIVERFS			2
+#define GENHD_FL_MEDIA_CHANGE_NOTIFY		4
 #define GENHD_FL_CD				8
 #define GENHD_FL_UP				16
 #define GENHD_FL_SUPPRESS_PARTITION_INFO	32