[Xen-devel] [PATCH v2 03/10] libxl: don't remove device frontend path from driver domains

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

A domain different than LIBXL_TOOLSTACK_DOMID should not try to remove
the frontend paths of a device.

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
Changes since RFC:
 * Toolstack domain is in charge of cleaning both the frontend and the
   backend paths, driver domain only removes the first directory of
   the backend path.
 * I have decided to not take IanC Ack on this patch because it has
   changed since RFC.
---
 tools/libxl/libxl_device.c |   20 ++++++++++++++++++--
 1 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 48acc92..d726f0b 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -562,6 +562,10 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device 
*dev)
     const char *tapdisk_params;
     xs_transaction_t t = 0;
     int rc;
+    uint32_t domid;
+
+    rc = libxl__get_domid(gc, &domid);
+    if (rc) goto out;
 
     for (;;) {
         rc = libxl__xs_transaction_start(gc, &t);
@@ -571,8 +575,20 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device 
*dev)
         rc = libxl__xs_read_checked(gc, t, tapdisk_path, &tapdisk_params);
         if (rc) goto out;
 
-        libxl__xs_path_cleanup(gc, t, fe_path);
-        libxl__xs_path_cleanup(gc, t, be_path);
+        if (domid == LIBXL_TOOLSTACK_DOMID) {
+            /*
+             * The toolstack domain is in charge for removing both the
+             * frontend and the backend path
+             */
+            libxl__xs_path_cleanup(gc, t, fe_path);
+            libxl__xs_path_cleanup(gc, t, be_path);
+        } else if (dev->backend_domid == domid) {
+            /*
+             * The driver domain is in charge for removing what it can
+             * from the backend path
+             */
+            libxl__xs_path_cleanup(gc, t, be_path);
+        }
 
         rc = libxl__xs_transaction_commit(gc, &t);
         if (!rc) break;
-- 
1.7.7.5 (Apple Git-26)


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