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[Xen-devel] [PATCH v2] Only call stat() when adding a disk if we expect a device to exist.

We consider calling stat() a helpful error check in the following
circumstances only:
 1. the disk backend type must be PHYsical
 2. the disk backend domain must be the same as the running libxl
 3. there must not be a hotplug script because this would imply that
    the device won't be created until after the hotplug script has

With this fix, it is possible to use qemu's built-in block drivers
such as ceph/rbd, with a xl config disk spec like this:


Signed-off-by: David Scott <dave.scott@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
 tools/libxl/libxl_device.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index eeea9d9..eb60fd5 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -236,7 +236,9 @@ int libxl__device_disk_set_backend(libxl__gc *gc, 
libxl_device_disk *disk) {
             return ERROR_INVAL;
         memset(&a.stab, 0, sizeof(a.stab));
-    } else if (!disk->script) {
+    } else if (disk->backend == LIBXL_DISK_BACKEND_PHY &&
+               disk->backend_domid == LIBXL_TOOLSTACK_DOMID &&
+               !disk->script) {
         if (stat(disk->pdev_path, &a.stab)) {
             LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "Disk vdev=%s "
                              "failed to stat: %s",

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