[PATCH 2/3] libxl: factor out libxl__disk_backend_from_xs_be

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

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
---
 tools/libxl/libxl.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index ef48550..01a2d11 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -2258,6 +2258,27 @@ int libxl__device_disk_setdefault(libxl__gc *gc, libxl_device_disk *disk)
     return rc;
 }
 
+static int libxl__disk_backend_from_xs_be(libxl__gc *gc,
+                                          const char *be_path,
+                                          libxl_device_disk *disk)
+{
+    char *type;
+    int rc = ERROR_FAIL;
+
+    type = libxl__xs_read(gc, XBT_NULL,
+                          libxl__sprintf(gc, "%s/type", be_path));
+    if (!type) {
+        LOG(ERROR, "Missing xenstore node %s/type", be_path);
+        goto out;
+    }
+
+    libxl_string_to_backend(CTX, type, &disk->backend);
+
+    rc = 0;
+out:
+    return rc;
+}
+
 int libxl__device_from_disk(libxl__gc *gc, uint32_t domid,
                                    libxl_device_disk *disk,
                                    libxl__device *device)
@@ -2572,14 +2593,8 @@ static int libxl__device_disk_from_xs_be(libxl__gc *gc,
         disk->pdev_path = tmp;
     }
 
-
-    tmp = libxl__xs_read(gc, XBT_NULL,
-                         libxl__sprintf(gc, "%s/type", be_path));
-    if (!tmp) {
-        LOG(ERROR, "Missing xenstore node %s/type", be_path);
-        goto cleanup;
-    }
-    libxl_string_to_backend(ctx, tmp, &(disk->backend));
+    rc = libxl__disk_backend_from_xs_be(gc, be_path, disk);
+    if (rc) goto cleanup;
 
     disk->vdev = xs_read(ctx->xsh, XBT_NULL,
                          libxl__sprintf(gc, "%s/dev", be_path), &len);
-- 
1.9.1