[PATCH] virtio-blk: Call revalidate_disk() upon online disk resize

[Vivek Goyal <vgoyal@redhat.com>]

If a virtio disk is open in guest and a disk resize operation is done,
(virsh blockresize), new size is not visible to tools like "fdisk -l".
This seems to be happening as we update only part->nr_sects and not
bdev->bd_inode size.

Call revalidate_disk() which should take care of it. I tested growing disk
size of already open disk and it works for me.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
 drivers/block/virtio_blk.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/drivers/block/virtio_blk.c
===================================================================
--- linux-2.6.orig/drivers/block/virtio_blk.c	2012-03-27 17:05:07.000000000 -0400
+++ linux-2.6/drivers/block/virtio_blk.c	2012-03-28 15:55:03.943462782 -0400
@@ -351,6 +351,7 @@ static void virtblk_config_changed_work(
 		  cap_str_10, cap_str_2);
 
 	set_capacity(vblk->disk, capacity);
+	revalidate_disk(vblk->disk);
 done:
 	mutex_unlock(&vblk->config_lock);
 }