block: Inline bdrv_detach_child()

The only caller is bdrv_root_unref_child(), let's just do the logic
directly in it. It simplifies further conversion of
bdrv_root_unref_child() to transaction actions.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@openvz.org>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20221107163558.618889-2-vsementsov@yandex-team.ru>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 19 insertions, 27 deletions

diff --git a/block.c b/block.c
index a18f052374..c0c1b3df91 100644
--- a/block.c
+++ b/block.c
@@ -3070,30 +3070,6 @@ static BdrvChild *bdrv_attach_child_noperm(BlockDriverState *parent_bs,
                                     tran, errp);
 }
 
-static void bdrv_detach_child(BdrvChild *child)
-{
-    BlockDriverState *old_bs = child->bs;
-
-    GLOBAL_STATE_CODE();
-    bdrv_replace_child_noperm(child, NULL);
-    bdrv_child_free(child);
-
-    if (old_bs) {
-        /*
-         * Update permissions for old node. We're just taking a parent away, so
-         * we're loosening restrictions. Errors of permission update are not
-         * fatal in this case, ignore them.
-         */
-        bdrv_refresh_perms(old_bs, NULL);
-
-        /*
-         * When the parent requiring a non-default AioContext is removed, the
-         * node moves back to the main AioContext
-         */
-        bdrv_try_change_aio_context(old_bs, qemu_get_aio_context(), NULL, NULL);
-    }
-}
-
 /*
  * This function steals the reference to child_bs from the caller.
  * That reference is later dropped by bdrv_root_unref_child().
@@ -3182,12 +3158,28 @@ out:
 /* Callers must ensure that child->frozen is false. */
 void bdrv_root_unref_child(BdrvChild *child)
 {
-    BlockDriverState *child_bs;
+    BlockDriverState *child_bs = child->bs;
 
     GLOBAL_STATE_CODE();
+    bdrv_replace_child_noperm(child, NULL);
+    bdrv_child_free(child);
+
+    if (child_bs) {
+        /*
+         * Update permissions for old node. We're just taking a parent away, so
+         * we're loosening restrictions. Errors of permission update are not
+         * fatal in this case, ignore them.
+         */
+        bdrv_refresh_perms(child_bs, NULL);
+
+        /*
+         * When the parent requiring a non-default AioContext is removed, the
+         * node moves back to the main AioContext
+         */
+        bdrv_try_change_aio_context(child_bs, qemu_get_aio_context(), NULL,
+                                    NULL);
+    }
 
-    child_bs = child->bs;
-    bdrv_detach_child(child);
     bdrv_unref(child_bs);
 }