util: mdev: Introduce virMediatedDeviceTypeReadAttrs getter

This should serve as a replacement for the existing udevFillMdevType
which is responsible for fetching the device type's attributes from the
sysfs interface. The problem with the existing solution is that it's
tied to the udev backend.

Signed-off-by: Erik Skultety <eskultet@redhat.com>

src/libvirt_private.syms

@@ -2182,6 +2182,7 @@ virMediatedDeviceModelTypeToString;
 virMediatedDeviceNew;
 virMediatedDeviceSetUsedBy;
 virMediatedDeviceTypeFree;
+virMediatedDeviceTypeReadAttrs;
 
 
 

src/util/virmdev.c

@@ -496,3 +496,37 @@ virMediatedDeviceTypeFree(virMediatedDeviceTypePtr type)
     VIR_FREE(type->device_api);
     VIR_FREE(type);
 }
+
+
+int
+virMediatedDeviceTypeReadAttrs(const char *sysfspath,
+                               virMediatedDeviceTypePtr *type)
+{
+    int ret = -1;
+    virMediatedDeviceTypePtr tmp = NULL;
+
+#define MDEV_GET_SYSFS_ATTR(attr, dst, cb) \
+    do { \
+        if (cb(dst, "%s/%s", sysfspath, attr) < 0) \
+            goto cleanup; \
+    } while (0)
+
+    if (VIR_ALLOC(tmp) < 0)
+        goto cleanup;
+
+    if (VIR_STRDUP(tmp->id, last_component(sysfspath)) < 0)
+        goto cleanup;
+
+    MDEV_GET_SYSFS_ATTR("name", &tmp->name, virFileReadValueString);
+    MDEV_GET_SYSFS_ATTR("device_api", &tmp->device_api, virFileReadValueString);
+    MDEV_GET_SYSFS_ATTR("available_instances", &tmp->available_instances,
+                        virFileReadValueUint);
+
+#undef MDEV_GET_SYSFS_ATTR
+
+    VIR_STEAL_PTR(*type, tmp);
+    ret = 0;
+ cleanup:
+    virMediatedDeviceTypeFree(tmp);
+    return ret;
+}

src/util/virmdev.h

@@ -129,4 +129,9 @@ virMediatedDeviceListMarkDevices(virMediatedDeviceListPtr dst,
 
 void
 virMediatedDeviceTypeFree(virMediatedDeviceTypePtr type);
+
+int
+virMediatedDeviceTypeReadAttrs(const char *sysfspath,
+                               virMediatedDeviceTypePtr *type);
+
 #endif /* __VIR_MDEV_H__ */