From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Fri, 30 Mar 2012 14:33:03 +0000 (+0000)
Subject: xen: handle backend deletion from xenstore
X-Git-Tag: qemu-xen-4.3.0-rc1~18^2~26
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=f36648aef45b3bfb83ac081749e66918c1fa9c7a;p=qemu-upstream-4.3-testing.git

xen: handle backend deletion from xenstore

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---

diff --git a/hw/xen_backend.c b/hw/xen_backend.c
index d876cabb1..555da411f 100644
--- a/hw/xen_backend.c
+++ b/hw/xen_backend.c
@@ -589,7 +589,7 @@ static void xenstore_update_be(char *watch, char *type, int dom,
                                struct XenDevOps *ops)
 {
     struct XenDevice *xendev;
-    char path[XEN_BUFSIZE], *dom0;
+    char path[XEN_BUFSIZE], *dom0, *bepath;
     unsigned int len, dev;
 
     dom0 = xs_get_domain_path(xenstore, 0);
@@ -608,15 +608,16 @@ static void xenstore_update_be(char *watch, char *type, int dom,
         return;
     }
 
-    if (0) {
-        /* FIXME: detect devices being deleted from xenstore ... */
-        xen_be_del_xendev(dom, dev);
-    }
-
     xendev = xen_be_get_xendev(type, dom, dev, ops);
     if (xendev != NULL) {
-        xen_be_backend_changed(xendev, path);
-        xen_be_check_state(xendev);
+        bepath = xs_read(xenstore, 0, xendev->be, &len);
+        if (bepath == NULL) {
+            xen_be_del_xendev(dom, dev);
+        } else {
+            free(bepath);
+            xen_be_backend_changed(xendev, path);
+            xen_be_check_state(xendev);
+        }
     }
 }
 
diff --git a/hw/xen_disk.c b/hw/xen_disk.c
index e9bbbf785..8217109c6 100644
--- a/hw/xen_disk.c
+++ b/hw/xen_disk.c
@@ -824,6 +824,10 @@ static int blk_free(struct XenDevice *xendev)
     struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
     struct ioreq *ioreq;
 
+    if (blkdev->bs || blkdev->sring) {
+        blk_disconnect(xendev);
+    }
+
     while (!QLIST_EMPTY(&blkdev->freelist)) {
         ioreq = QLIST_FIRST(&blkdev->freelist);
         QLIST_REMOVE(ioreq, list);