[PATCH 04/16] xen/front: Propagate changed size of VBDs
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From: Jeremy Fitzhardinge on 20 Jul 2010 16:50 From: K. Y. Srinivasan <ksrinivasan(a)novell.com> 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(a)novell.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge(a)citrix.com> --- drivers/block/xen-blkfront.c | 19 +++++++++++++++++-- 1 files changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index df2bae5..0b4091b 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -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", §ors); + 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); -- 1.7.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |