UBI: bugfix: do not forget to increment vol_count

When creating a new volume, do not forget to increment the
vol_count variable.

Also, users are not interested in internal volumes, so do not show
them in the volumes_count sysfs file.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index b967191..8f1f9fe 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -246,7 +246,7 @@
 	else if (attr == &dev_total_eraseblocks)
 		ret = sprintf(buf, "%d\n", ubi->good_peb_count);
 	else if (attr == &dev_volumes_count)
-		ret = sprintf(buf, "%d\n", ubi->vol_count);
+		ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT);
 	else if (attr == &dev_max_ec)
 		ret = sprintf(buf, "%d\n", ubi->max_ec);
 	else if (attr == &dev_reserved_for_bad)
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 42d3dd7..177227e 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -357,6 +357,7 @@
 
 	spin_lock(&ubi->volumes_lock);
 	ubi->volumes[vol_id] = vol;
+	ubi->vol_count += 1;
 	spin_unlock(&ubi->volumes_lock);
 
 	paranoid_check_volumes(ubi);