1 // SPDX-License-Identifier: GPL-2.0-only
33 const char *perf_ns__name(unsigned int id)  in perf_ns__name()  argument
35 	if (id >= ARRAY_SIZE(perf_ns__names))  in perf_ns__name()
37 	return perf_ns__names[id];  in perf_ns__name()
43 	u64 link_info_size = ((event ? event->nr_namespaces : NR_NAMESPACES) *  in namespaces__new()
50 	namespaces->end_time = -1;  in namespaces__new()
53 		memcpy(namespaces->link_info, event->link_info, link_info_size);  in namespaces__new()
73 	int rv = -1;  in nsinfo__init()
75 	if (snprintf(oldns, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)  in nsinfo__init()
78 	if (asprintf(&newns, "/proc/%d/ns/mnt", nsi->pid) == -1)  in nsinfo__init()
91 		nsi->need_setns = true;  in nsinfo__init()
92 		nsi->mntns_path = newns;  in nsinfo__init()
99 	if (snprintf(spath, PATH_MAX, "/proc/%d/status", nsi->pid) >= PATH_MAX)  in nsinfo__init()
106 	while (getline(&statln, &linesz, f) != -1) {  in nsinfo__init()
109 			nsi->tgid = (pid_t)strtol(strrchr(statln, '\t'),  in nsinfo__init()
111 			nsi->nstgid = nsi->tgid;  in nsinfo__init()
115 			nsi->nstgid = (pid_t)strtol(strrchr(statln, '\t'),  in nsinfo__init()
139 		nsi->pid = pid;  in nsinfo__new()
140 		nsi->tgid = pid;  in nsinfo__new()
141 		nsi->nstgid = pid;  in nsinfo__new()
142 		nsi->need_setns = false;  in nsinfo__new()
144 		 * at its proc information.  In that case, save the pid but  in nsinfo__new()
147 		if (nsinfo__init(nsi) == -1)  in nsinfo__new()
148 			nsi->need_setns = false;  in nsinfo__new()
150 		refcount_set(&nsi->refcnt, 1);  in nsinfo__new()
165 		nnsi->pid = nsi->pid;  in nsinfo__copy()
166 		nnsi->tgid = nsi->tgid;  in nsinfo__copy()
167 		nnsi->nstgid = nsi->nstgid;  in nsinfo__copy()
168 		nnsi->need_setns = nsi->need_setns;  in nsinfo__copy()
169 		if (nsi->mntns_path) {  in nsinfo__copy()
170 			nnsi->mntns_path = strdup(nsi->mntns_path);  in nsinfo__copy()
171 			if (!nnsi->mntns_path) {  in nsinfo__copy()
176 		refcount_set(&nnsi->refcnt, 1);  in nsinfo__copy()
184 	zfree(&nsi->mntns_path);  in nsinfo__delete()
191 		refcount_inc(&nsi->refcnt);  in nsinfo__get()
197 	if (nsi && refcount_dec_and_test(&nsi->refcnt))  in nsinfo__put()
205 	int oldns = -1;  in nsinfo__mountns_enter()
206 	int newns = -1;  in nsinfo__mountns_enter()
212 	nc->oldns = -1;  in nsinfo__mountns_enter()
213 	nc->newns = -1;  in nsinfo__mountns_enter()
215 	if (!nsi || !nsi->need_setns)  in nsinfo__mountns_enter()
218 	if (snprintf(curpath, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)  in nsinfo__mountns_enter()
229 	newns = open(nsi->mntns_path, O_RDONLY);  in nsinfo__mountns_enter()
236 	nc->oldcwd = oldcwd;  in nsinfo__mountns_enter()
237 	nc->oldns = oldns;  in nsinfo__mountns_enter()
238 	nc->newns = newns;  in nsinfo__mountns_enter()
243 	if (oldns > -1)  in nsinfo__mountns_enter()
245 	if (newns > -1)  in nsinfo__mountns_enter()
251 	if (nc == NULL || nc->oldns == -1 || nc->newns == -1 || !nc->oldcwd)  in nsinfo__mountns_exit()
254 	setns(nc->oldns, CLONE_NEWNS);  in nsinfo__mountns_exit()
256 	if (nc->oldcwd) {  in nsinfo__mountns_exit()
257 		WARN_ON_ONCE(chdir(nc->oldcwd));  in nsinfo__mountns_exit()
258 		zfree(&nc->oldcwd);  in nsinfo__mountns_exit()
261 	if (nc->oldns > -1) {  in nsinfo__mountns_exit()
262 		close(nc->oldns);  in nsinfo__mountns_exit()
263 		nc->oldns = -1;  in nsinfo__mountns_exit()
266 	if (nc->newns > -1) {  in nsinfo__mountns_exit()
267 		close(nc->newns);  in nsinfo__mountns_exit()
268 		nc->newns = -1;  in nsinfo__mountns_exit()