[PATCH v2 16/18] libxl: introduce libxl_userdata_unlink

[Wei Liu <wei.liu2@citrix.com>]

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
 tools/libxl/libxl.h     |   10 ++++++++++
 tools/libxl/libxl_dom.c |   25 +++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index d12f166..b124753 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -67,6 +67,13 @@
  * the same $(XEN_VERSION) (e.g. throughout a major release).
  */
 
+/* LIBXL_HAVE_USERDATA_UNLINK
+ *
+ * If it is defined, libxl has a library function called
+ * libxl_userdata_unlink.
+ */
+#define LIBXL_HAVE_USERDATA_UNLINK 1
+
 /* LIBXL_HAVE_CPUPOOL_QUALIFIER_TO_CPUPOOLID
  *
  * If this is defined, libxl has a library function called
@@ -1228,6 +1235,9 @@ int libxl_userdata_retrieve(libxl_ctx *ctx, uint32_t domid,
    * data_r and datalen_r may be 0.
    * On error return, *data_r and *datalen_r are undefined.
    */
+int libxl_userdata_unlink(libxl_ctx *ctx, uint32_t domid,
+                          const char *userdata_userid);
+
 
 int libxl_get_physinfo(libxl_ctx *ctx, libxl_physinfo *physinfo);
 int libxl_set_vcpuaffinity(libxl_ctx *ctx, uint32_t domid, uint32_t vcpuid,
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 3b9eade..f111cf1 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -1975,6 +1975,31 @@ out:
     return rc;
 }
 
+int libxl_userdata_unlink(libxl_ctx *ctx, uint32_t domid,
+                          const char *userdata_userid)
+{
+    GC_INIT(ctx);
+    int rc;
+    libxl__carefd *lock;
+    const char *filename;
+
+    CTX_LOCK;
+    lock = libxl__lock_domain_data(gc, domid);
+    if (!lock) {
+        rc = ERROR_LOCK_FAIL;
+        goto out;
+    }
+
+    filename = libxl__userdata_path(gc, domid, userdata_userid, "d");
+    if (unlink(filename)) rc = ERROR_FAIL;
+
+    libxl__unlock_domain_data(lock);
+out:
+    CTX_UNLOCK;
+    GC_FREE;
+    return rc;
+}
+
 /*
  * Local variables:
  * mode: C
-- 
1.7.10.4