linux-kernel - [PATCH] virtio-blk: Call revalidate

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Message-ID: <20120328203200.GE3376@redhat.com>
Date:	Wed, 28 Mar 2012 16:32:00 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org
Cc:	Christoph Hellwig <hch@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jens Axboe <axboe@...nel.dk>, Amit Shah <amit.shah@...hat.com>,
	Moyer Jeff Moyer <jmoyer@...hat.com>
Subject: [PATCH] virtio-blk: Call revalidate_disk() upon online disk resize

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@...hat.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);
 }
--
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