io_uring/rsrc: remove io_rsrc_node::done

Kill io_rsrc_node::node and check refs instead, it's set when the nodes
refcount hits zero, and it won't change afterwards.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/bbde361f4010f7e8bf196f1ecca27a763b79926f.1681395792.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/rsrc.c

@@ -191,14 +191,12 @@ void io_rsrc_node_ref_zero(struct io_rsrc_node *node)
 {
 	struct io_ring_ctx *ctx = node->rsrc_data->ctx;
 
-	node->done = true;
 	while (!list_empty(&ctx->rsrc_ref_list)) {
 		node = list_first_entry(&ctx->rsrc_ref_list,
 					    struct io_rsrc_node, node);
 		/* recycle ref nodes in order */
-		if (!node->done)
+		if (node->refs)
 			break;
-
 		list_del(&node->node);
 		__io_rsrc_put_work(node);
 	}
@@ -222,7 +220,6 @@ struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx)
 	ref_node->refs = 1;
 	INIT_LIST_HEAD(&ref_node->node);
 	INIT_LIST_HEAD(&ref_node->item_list);
-	ref_node->done = false;
 	ref_node->inline_items = 0;
 	return ref_node;
 }

io_uring/rsrc.h

@@ -48,7 +48,6 @@ struct io_rsrc_node {
 	struct list_head		node;
 	struct llist_node		llist;
 	int				refs;
-	bool				done;
 
 	/*
 	 * Keeps a list of struct io_rsrc_put to be completed. Each entry