[Xen-devel] [PATCH 4/4] xl: use qdisk if blktap2 is not available

[stefano.stabellini@xxxxxxxxxxxxx]

Whenever blktap2 is not available use qdisk as block backend instead.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

diff -r 388c44a63613 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c       Wed Nov 10 14:56:06 2010 +0000
+++ b/tools/libxl/libxl.c       Thu Nov 18 12:45:03 2010 +0000
@@ -1856,7 +1856,10 @@ int libxl_device_disk_add(libxl_ctx *ctx
             flexarray_set(back, boffset++, libxl__sprintf(&gc, "%s:%s",
                           
libxl__device_disk_string_of_phystype(disk->phystype), disk->physpath));
 
-            device.backend_kind = DEVICE_TAP;
+            if (libxl__blktap_enabled(&gc))
+                device.backend_kind = DEVICE_TAP;
+            else
+                device.backend_kind = DEVICE_QDISK;
             break;
 
         default:
diff -r 388c44a63613 tools/libxl/libxl_device.c
--- a/tools/libxl/libxl_device.c        Wed Nov 10 14:56:06 2010 +0000
+++ b/tools/libxl/libxl_device.c        Thu Nov 18 12:45:03 2010 +0000
@@ -33,6 +33,7 @@ static const char *string_of_kinds[] = {
     [DEVICE_VIF2] = "vif2",
     [DEVICE_VBD] = "vbd",
     [DEVICE_TAP] = "tap",
+    [DEVICE_QDISK] = "qdisk",
     [DEVICE_PCI] = "pci",
     [DEVICE_VFB] = "vfb",
     [DEVICE_VKBD] = "vkbd",
diff -r 388c44a63613 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h      Wed Nov 10 14:56:06 2010 +0000
+++ b/tools/libxl/libxl_internal.h      Thu Nov 18 12:45:03 2010 +0000
@@ -82,6 +82,7 @@ typedef enum {
     DEVICE_VIF2,
     DEVICE_VBD,
     DEVICE_TAP,
+    DEVICE_QDISK,
     DEVICE_PCI,
     DEVICE_VFB,
     DEVICE_VKBD,

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