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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_NS_COMMON_H
#define _LINUX_NS_COMMON_H
#include <linux/refcount.h>
#include <linux/rbtree.h>
struct proc_ns_operations;
struct cgroup_namespace;
struct ipc_namespace;
struct mnt_namespace;
struct net;
struct pid_namespace;
struct time_namespace;
struct user_namespace;
struct uts_namespace;
extern struct cgroup_namespace init_cgroup_ns;
extern struct ipc_namespace init_ipc_ns;
extern struct mnt_namespace init_mnt_ns;
extern struct net init_net;
extern struct pid_namespace init_pid_ns;
extern struct time_namespace init_time_ns;
extern struct user_namespace init_user_ns;
extern struct uts_namespace init_uts_ns;
struct ns_common {
struct dentry *stashed;
const struct proc_ns_operations *ops;
unsigned int inum;
refcount_t count;
union {
struct {
u64 ns_id;
struct rb_node ns_tree_node;
struct list_head ns_list_node;
};
struct rcu_head ns_rcu;
};
};
int __ns_common_init(struct ns_common *ns, const struct proc_ns_operations *ops, int inum);
#define to_ns_common(__ns) \
_Generic((__ns), \
struct cgroup_namespace *: &(__ns)->ns, \
struct ipc_namespace *: &(__ns)->ns, \
struct mnt_namespace *: &(__ns)->ns, \
struct net *: &(__ns)->ns, \
struct pid_namespace *: &(__ns)->ns, \
struct time_namespace *: &(__ns)->ns, \
struct user_namespace *: &(__ns)->ns, \
struct uts_namespace *: &(__ns)->ns)
#define ns_init_inum(__ns) \
_Generic((__ns), \
struct cgroup_namespace *: CGROUP_NS_INIT_INO, \
struct ipc_namespace *: IPC_NS_INIT_INO, \
struct mnt_namespace *: MNT_NS_INIT_INO, \
struct net *: NET_NS_INIT_INO, \
struct pid_namespace *: PID_NS_INIT_INO, \
struct time_namespace *: TIME_NS_INIT_INO, \
struct user_namespace *: USER_NS_INIT_INO, \
struct uts_namespace *: UTS_NS_INIT_INO)
#define ns_init_ns(__ns) \
_Generic((__ns), \
struct cgroup_namespace *: &init_cgroup_ns, \
struct ipc_namespace *: &init_ipc_ns, \
struct mnt_namespace *: &init_mnt_ns, \
struct net *: &init_net, \
struct pid_namespace *: &init_pid_ns, \
struct time_namespace *: &init_time_ns, \
struct user_namespace *: &init_user_ns, \
struct uts_namespace *: &init_uts_ns)
#define ns_common_init(__ns, __ops) \
__ns_common_init(to_ns_common(__ns), __ops, (((__ns) == ns_init_ns(__ns)) ? ns_init_inum(__ns) : 0))
#define ns_common_init_inum(__ns, __ops, __inum) __ns_common_init(to_ns_common(__ns), __ops, __inum)
#endif
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