xen/front: Propagate changed size of VBDs (1fa73be6) · Commits · 戴 / test

Support dynamic resizing of virtual block devices. This patch supports both file backed block devices as well as physical devices that can be dynamically resized on the host side. Signed-off-by:

K. Y. Srinivasan <ksrinivasan@novell.com> Signed-off-by:

Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

drivers/block/xen-blkfront.c

+17 −2

Original line number	Diff line number	Diff line
		@@ -930,9 +930,24 @@ static void blkfront_connect(struct blkfront_info *info)
		unsigned int binfo;
		int err;

		if ((info->connected == BLKIF_STATE_CONNECTED) \|\|
		(info->connected == BLKIF_STATE_SUSPENDED) )
		switch (info->connected) {
		case BLKIF_STATE_CONNECTED:
		/*
		* Potentially, the back-end may be signalling
		* a capacity change; update the capacity.
		*/
		err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
		"sectors", "%Lu", &sectors);
		if (XENBUS_EXIST_ERR(err))
		return;
		printk(KERN_INFO "Setting capacity to %Lu\n",
		sectors);
		set_capacity(info->gd, sectors);

		/* fall through */
		case BLKIF_STATE_SUSPENDED:
		return;
		}

		dev_dbg(&info->xbdev->dev, "%s:%s.\n",
		__func__, info->xbdev->otherend);

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