[PULL 33/39] block: inline bdrv_replace_child()

[Kevin Wolf <kwolf@redhat.com>]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

bdrv_replace_child() has only one caller, the second argument is
unused. Inline it now. This triggers deletion of some more unused
interfaces.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210428151804.439460-34-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c | 101 ++++++++++----------------------------------------------
 1 file changed, 18 insertions(+), 83 deletions(-)

diff --git a/block.c b/block.c
index 38bd2ea32e..2362c934a4 100644
--- a/block.c
+++ b/block.c
@@ -2401,42 +2401,6 @@ static int bdrv_list_refresh_perms(GSList *list, BlockReopenQueue *q,
     return 0;
 }
 
-static void bdrv_node_set_perm(BlockDriverState *bs)
-{
-    BlockDriver *drv = bs->drv;
-    BdrvChild *c;
-
-    if (!drv) {
-        return;
-    }
-
-    bdrv_drv_set_perm_commit(bs);
-
-    /* Drivers that never have children can omit .bdrv_child_perm() */
-    if (!drv->bdrv_child_perm) {
-        assert(QLIST_EMPTY(&bs->children));
-        return;
-    }
-
-    /* Update all children */
-    QLIST_FOREACH(c, &bs->children, next) {
-        bdrv_child_set_perm_commit(c);
-    }
-}
-
-static void bdrv_list_set_perm(GSList *list)
-{
-    for ( ; list; list = list->next) {
-        bdrv_node_set_perm((BlockDriverState *)list->data);
-    }
-}
-
-static void bdrv_set_perm(BlockDriverState *bs)
-{
-    g_autoptr(GSList) list = bdrv_topological_dfs(NULL, NULL, bs);
-    return bdrv_list_set_perm(list);
-}
-
 void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm,
                               uint64_t *shared_perm)
 {
@@ -2776,52 +2740,6 @@ static void bdrv_replace_child_noperm(BdrvChild *child,
     }
 }
 
-/*
- * Updates @child to change its reference to point to @new_bs, including
- * checking and applying the necessary permission updates both to the old node
- * and to @new_bs.
- *
- * NULL is passed as @new_bs for removing the reference before freeing @child.
- *
- * If @new_bs is not NULL, bdrv_check_perm() must be called beforehand, as this
- * function uses bdrv_set_perm() to update the permissions according to the new
- * reference that @new_bs gets.
- *
- * Callers must ensure that child->frozen is false.
- */
-static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs)
-{
-    BlockDriverState *old_bs = child->bs;
-
-    /* Asserts that child->frozen == false */
-    bdrv_replace_child_noperm(child, new_bs);
-
-    /*
-     * Start with the new node's permissions.  If @new_bs is a (direct
-     * or indirect) child of @old_bs, we must complete the permission
-     * update on @new_bs before we loosen the restrictions on @old_bs.
-     * Otherwise, bdrv_check_perm() on @old_bs would re-initiate
-     * updating the permissions of @new_bs, and thus not purely loosen
-     * restrictions.
-     */
-    if (new_bs) {
-        bdrv_set_perm(new_bs);
-    }
-
-    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_set_aio_context(old_bs, qemu_get_aio_context(), NULL);
-    }
-}
-
 static void bdrv_child_free(void *opaque)
 {
     BdrvChild *c = opaque;
@@ -2989,8 +2907,25 @@ static int bdrv_attach_child_noperm(BlockDriverState *parent_bs,
 
 static void bdrv_detach_child(BdrvChild *child)
 {
-    bdrv_replace_child(child, NULL);
+    BlockDriverState *old_bs = child->bs;
+
+    bdrv_replace_child_noperm(child, NULL);
     bdrv_remove_empty_child(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_set_aio_context(old_bs, qemu_get_aio_context(), NULL);
+    }
 }
 
 /*
-- 
2.30.2