block: Convert throttle_group_get_name() to BlockBackend

Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NAlberto Garcia <berto@igalia.com>
Acked-by: NStefan Hajnoczi <stefanha@redhat.com>

block/block-backend.c

@@ -1525,7 +1525,7 @@ void blk_update_root_state(BlockBackend *blk)
         throttle_group_unref(blk->root_state.throttle_state);
     }
     if (blk->root->bs->throttle_state) {
-        const char *name = throttle_group_get_name(blk->root->bs);
+        const char *name = throttle_group_get_name(blk);
         blk->root_state.throttle_group = g_strdup(name);
         blk->root_state.throttle_state = throttle_group_incref(name);
     } else {

block/io.c

@@ -89,7 +89,7 @@ void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group)
     }
 
     /* this bs is a part of the same group than the one we want */
-    if (!g_strcmp0(throttle_group_get_name(bs), group)) {
+    if (!g_strcmp0(throttle_group_get_name(bs->blk), group)) {
         return;
     }
 

block/qapi.c

@@ -118,7 +118,7 @@ BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
         info->iops_size = cfg.op_size;
 
         info->has_group = true;
-        info->group = g_strdup(throttle_group_get_name(bs));
+        info->group = g_strdup(throttle_group_get_name(bs->blk));
     }
 
     info->write_threshold = bdrv_write_threshold_get(bs);

block/throttle-groups.c

@@ -133,16 +133,16 @@ void throttle_group_unref(ThrottleState *ts)
     qemu_mutex_unlock(&throttle_groups_lock);
 }
 
-/* Get the name from a BlockDriverState's ThrottleGroup. The name (and
- * the pointer) is guaranteed to remain constant during the lifetime
- * of the group.
+/* Get the name from a BlockBackend's ThrottleGroup. The name (and the pointer)
+ * is guaranteed to remain constant during the lifetime of the group.
  *
- * @bs:   a BlockDriverState that is member of a throttling group
+ * @blk:  a BlockBackend that is member of a throttling group
  * @ret:  the name of the group.
  */
-const char *throttle_group_get_name(BlockDriverState *bs)
+const char *throttle_group_get_name(BlockBackend *blk)
 {
-    ThrottleGroup *tg = container_of(bs->throttle_state, ThrottleGroup, ts);
+    ThrottleGroup *tg = container_of(blk_bs(blk)->throttle_state,
+                                     ThrottleGroup, ts);
     return tg->name;
 }
 

include/block/throttle-groups.h

@@ -28,7 +28,7 @@
 #include "qemu/throttle.h"
 #include "block/block_int.h"
 
-const char *throttle_group_get_name(BlockDriverState *bs);
+const char *throttle_group_get_name(BlockBackend *blk);
 
 ThrottleState *throttle_group_incref(const char *name);
 void throttle_group_unref(ThrottleState *ts);

tests/test-throttle.c

@@ -598,8 +598,8 @@ static void test_groups(void)
     g_assert(bdrv2->throttle_state != NULL);
     g_assert(bdrv3->throttle_state != NULL);
 
-    g_assert(!strcmp(throttle_group_get_name(bdrv1), "bar"));
-    g_assert(!strcmp(throttle_group_get_name(bdrv2), "foo"));
+    g_assert(!strcmp(throttle_group_get_name(blk1), "bar"));
+    g_assert(!strcmp(throttle_group_get_name(blk2), "foo"));
     g_assert(bdrv1->throttle_state == bdrv3->throttle_state);
 
     /* Setting the config of a group member affects the whole group */