[Xen-devel] [PATCH 04/16] xen/front: Propagate changed size of VBDs

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 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", &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);
-- 
1.7.1.1


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