1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  *
4  * Copyright (C) 2017 Hari Bathini, IBM Corporation
5  */
6 
7 #ifndef __PERF_NAMESPACES_H
8 #define __PERF_NAMESPACES_H
9 
10 #include <sys/types.h>
11 #include <sys/stat.h>
12 #include <linux/stddef.h>
13 #include <linux/perf_event.h>
14 #include <linux/refcount.h>
15 #include <linux/types.h>
16 
17 #ifndef HAVE_SETNS_SUPPORT
18 int setns(int fd, int nstype);
19 #endif
20 
21 struct perf_record_namespaces;
22 
23 struct namespaces {
24 	struct list_head list;
25 	u64 end_time;
26 	struct perf_ns_link_info link_info[];
27 };
28 
29 struct namespaces *namespaces__new(struct perf_record_namespaces *event);
30 void namespaces__free(struct namespaces *namespaces);
31 
32 struct nsinfo {
33 	pid_t			pid;
34 	pid_t			tgid;
35 	pid_t			nstgid;
36 	bool			need_setns;
37 	bool			in_pidns;
38 	char			*mntns_path;
39 	refcount_t		refcnt;
40 };
41 
42 struct nscookie {
43 	int			oldns;
44 	int			newns;
45 	char			*oldcwd;
46 };
47 
48 int nsinfo__init(struct nsinfo *nsi);
49 struct nsinfo *nsinfo__new(pid_t pid);
50 struct nsinfo *nsinfo__copy(const struct nsinfo *nsi);
51 
52 struct nsinfo *nsinfo__get(struct nsinfo *nsi);
53 void nsinfo__put(struct nsinfo *nsi);
54 
55 bool nsinfo__need_setns(const struct nsinfo *nsi);
56 void nsinfo__clear_need_setns(struct nsinfo *nsi);
57 pid_t nsinfo__tgid(const struct nsinfo  *nsi);
58 pid_t nsinfo__nstgid(const struct nsinfo  *nsi);
59 pid_t nsinfo__pid(const struct nsinfo  *nsi);
60 pid_t nsinfo__in_pidns(const struct nsinfo  *nsi);
61 
62 void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
63 void nsinfo__mountns_exit(struct nscookie *nc);
64 
65 char *nsinfo__realpath(const char *path, struct nsinfo *nsi);
66 int nsinfo__stat(const char *filename, struct stat *st, struct nsinfo *nsi);
67 
68 bool nsinfo__is_in_root_namespace(void);
69 
__nsinfo__zput(struct nsinfo ** nsip)70 static inline void __nsinfo__zput(struct nsinfo **nsip)
71 {
72 	if (nsip) {
73 		nsinfo__put(*nsip);
74 		*nsip = NULL;
75 	}
76 }
77 
78 #define nsinfo__zput(nsi) __nsinfo__zput(&nsi)
79 
80 const char *perf_ns__name(unsigned int id);
81 
82 #endif  /* __PERF_NAMESPACES_H */
83