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xen/front: Propagate changed size of VBDs

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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>
This commit is contained in:
K. Y. Srinivasan 2010-03-11 13:42:26 -08:00 committed by Jens Axboe
parent 5d7ed20e82
commit 1fa73be6be
1 changed files with 17 additions and 2 deletions
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19
drivers/block/xen-blkfront.c
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@ -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);