[Xen-devel] [PATCH v3 2/9] libxl: Remove redundant setting of phyical-device

[George Dunlap <george.dunlap@xxxxxxxxxx>]

Regardless of whether we're running a custom hotplug script or using
normal phy: or file:, the "block" script will be run, which will set
all the necessary xenstore nodes.

In fact, writing this value here prevents the block script from
accomplishing its only purpose: to detect duplicate physical block
devices used in different virtual devices.  The first thing the block
script does is check to see if this node is written; and if it is, it
silently exits.

Remove this, and let the block script perform its duplicate checking
function.

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
NOTE: It's likely that the duplicate checking for physical devices has
never been run under libxl (at least since this bug was introduced);
this may shake out some issues.

CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Roger Pau Monne <roger.pau@xxxxxxxxxx>
---
 tools/libxl/libxl.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 3471c4c..93f50d3 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -2440,21 +2440,6 @@ static void device_disk_add(libxl__egc *egc, uint32_t 
domid,
                                          libxl__xen_script_dir_path());
                 flexarray_append_pair(back, "script", script);
 
-                /* If the user did not supply a block script then we
-                 * write the physical-device node ourselves.
-                 *
-                 * If the user did supply a script then that script is
-                 * responsible for this since the block device may not
-                 * exist yet.
-                 */
-                if (!disk->script &&
-                    disk->backend_domid == LIBXL_TOOLSTACK_DOMID) {
-                    int major, minor;
-                    if (!libxl__device_physdisk_major_minor(dev, &major, 
&minor))
-                        flexarray_append_pair(back, "physical-device",
-                                              GCSPRINTF("%x:%x", major, 
minor));
-                }
-
                 assert(device->backend_kind == LIBXL__DEVICE_KIND_VBD);
                 break;
 
-- 
2.1.4


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