nsfs.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/* Copyright (c) 2025 Christian Brauner <brauner@kernel.org> */
 3
 4#ifndef _LINUX_NSFS_H
 5#define _LINUX_NSFS_H
 6
 7#include <linux/ns_common.h>
 8#include <linux/cred.h>
 9#include <linux/pid_namespace.h>
10
11struct path;
12struct task_struct;
13struct proc_ns_operations;
14
15int ns_get_path(struct path *path, struct task_struct *task,
16		const struct proc_ns_operations *ns_ops);
17typedef struct ns_common *ns_get_path_helper_t(void *);
18int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
19		   void *private_data);
20
21bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
22
23int ns_get_name(char *buf, size_t size, struct task_struct *task,
24			const struct proc_ns_operations *ns_ops);
25void nsfs_init(void);
26
27#define __current_namespace_from_type(__ns)				\
28	_Generic((__ns),						\
29		struct cgroup_namespace *: current->nsproxy->cgroup_ns,	\
30		struct ipc_namespace *:    current->nsproxy->ipc_ns,	\
31		struct net *:              current->nsproxy->net_ns,	\
32		struct pid_namespace *:    task_active_pid_ns(current),	\
33		struct mnt_namespace *:    current->nsproxy->mnt_ns,	\
34		struct time_namespace *:   current->nsproxy->time_ns,	\
35		struct user_namespace *:   current_user_ns(),		\
36		struct uts_namespace *:    current->nsproxy->uts_ns)
37
38#define current_in_namespace(__ns) (__current_namespace_from_type(__ns) == __ns)
39
40void nsproxy_ns_active_get(struct nsproxy *ns);
41void nsproxy_ns_active_put(struct nsproxy *ns);
42
43#endif /* _LINUX_NSFS_H */