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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2025 Christian Brauner <brauner@kernel.org> */
#ifndef _LINUX_NSTREE_H
#define _LINUX_NSTREE_H
#include <linux/ns/nstree_types.h>
#include <linux/nsproxy.h>
#include <linux/rbtree.h>
#include <linux/seqlock.h>
#include <linux/rculist.h>
#include <linux/cookie.h>
#include <uapi/linux/nsfs.h>
struct ns_common;
extern struct ns_tree_root cgroup_ns_tree;
extern struct ns_tree_root ipc_ns_tree;
extern struct ns_tree_root mnt_ns_tree;
extern struct ns_tree_root net_ns_tree;
extern struct ns_tree_root pid_ns_tree;
extern struct ns_tree_root time_ns_tree;
extern struct ns_tree_root user_ns_tree;
extern struct ns_tree_root uts_ns_tree;
void ns_tree_node_init(struct ns_tree_node *node);
void ns_tree_root_init(struct ns_tree_root *root);
bool ns_tree_node_empty(const struct ns_tree_node *node);
struct rb_node *ns_tree_node_add(struct ns_tree_node *node,
struct ns_tree_root *root,
int (*cmp)(struct rb_node *, const struct rb_node *));
void ns_tree_node_del(struct ns_tree_node *node, struct ns_tree_root *root);
#define to_ns_tree(__ns) \
_Generic((__ns), \
struct cgroup_namespace *: &(cgroup_ns_tree), \
struct ipc_namespace *: &(ipc_ns_tree), \
struct net *: &(net_ns_tree), \
struct pid_namespace *: &(pid_ns_tree), \
struct mnt_namespace *: &(mnt_ns_tree), \
struct time_namespace *: &(time_ns_tree), \
struct user_namespace *: &(user_ns_tree), \
struct uts_namespace *: &(uts_ns_tree))
#define ns_tree_gen_id(__ns) \
__ns_tree_gen_id(to_ns_common(__ns), \
(((__ns) == ns_init_ns(__ns)) ? ns_init_id(__ns) : 0))
u64 __ns_tree_gen_id(struct ns_common *ns, u64 id);
void __ns_tree_add_raw(struct ns_common *ns, struct ns_tree_root *ns_tree);
void __ns_tree_remove(struct ns_common *ns, struct ns_tree_root *ns_tree);
struct ns_common *ns_tree_lookup_rcu(u64 ns_id, int ns_type);
struct ns_common *__ns_tree_adjoined_rcu(struct ns_common *ns,
struct ns_tree_root *ns_tree,
bool previous);
static inline void __ns_tree_add(struct ns_common *ns, struct ns_tree_root *ns_tree, u64 id)
{
__ns_tree_gen_id(ns, id);
__ns_tree_add_raw(ns, ns_tree);
}
/**
* ns_tree_add_raw - Add a namespace to a namespace
* @ns: Namespace to add
*
* This function adds a namespace to the appropriate namespace tree
* without assigning a id.
*/
#define ns_tree_add_raw(__ns) __ns_tree_add_raw(to_ns_common(__ns), to_ns_tree(__ns))
/**
* ns_tree_add - Add a namespace to a namespace tree
* @ns: Namespace to add
*
* This function assigns a new id to the namespace and adds it to the
* appropriate namespace tree and list.
*/
#define ns_tree_add(__ns) \
__ns_tree_add(to_ns_common(__ns), to_ns_tree(__ns), \
(((__ns) == ns_init_ns(__ns)) ? ns_init_id(__ns) : 0))
/**
* ns_tree_remove - Remove a namespace from a namespace tree
* @ns: Namespace to remove
*
* This function removes a namespace from the appropriate namespace
* tree and list.
*/
#define ns_tree_remove(__ns) __ns_tree_remove(to_ns_common(__ns), to_ns_tree(__ns))
#define ns_tree_adjoined_rcu(__ns, __previous) \
__ns_tree_adjoined_rcu(to_ns_common(__ns), to_ns_tree(__ns), __previous)
#define ns_tree_active(__ns) (!RB_EMPTY_NODE(&to_ns_common(__ns)->ns_tree_node.ns_node))
#endif /* _LINUX_NSTREE_H */
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