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()
74 	int rv = -1;  in nsinfo__init()
76 	if (snprintf(oldns, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)  in nsinfo__init()
79 	if (asprintf(&newns, "/proc/%d/ns/mnt", nsi->pid) == -1)  in nsinfo__init()
92 		nsi->need_setns = true;  in nsinfo__init()
93 		nsi->mntns_path = newns;  in nsinfo__init()
100 	if (snprintf(spath, PATH_MAX, "/proc/%d/status", nsi->pid) >= PATH_MAX)  in nsinfo__init()
107 	while (getline(&statln, &linesz, f) != -1) {  in nsinfo__init()
110 			nsi->tgid = (pid_t)strtol(strrchr(statln, '\t'),  in nsinfo__init()
112 			nsi->nstgid = nsi->tgid;  in nsinfo__init()
117 			nsi->nstgid = (pid_t)strtol(nspid, NULL, 10);  in nsinfo__init()
121 			nsi->in_pidns = (statln + sizeof("NStgid:") - 1) != nspid;  in nsinfo__init()
144 		nsi->pid = pid;  in nsinfo__new()
145 		nsi->tgid = pid;  in nsinfo__new()
146 		nsi->nstgid = pid;  in nsinfo__new()
147 		nsi->need_setns = false;  in nsinfo__new()
148 		nsi->in_pidns = false;  in nsinfo__new()
150 		 * at its proc information.  In that case, save the pid but  in nsinfo__new()
153 		if (nsinfo__init(nsi) == -1)  in nsinfo__new()
154 			nsi->need_setns = false;  in nsinfo__new()
156 		refcount_set(&nsi->refcnt, 1);  in nsinfo__new()
171 		nnsi->pid = nsi->pid;  in nsinfo__copy()
172 		nnsi->tgid = nsi->tgid;  in nsinfo__copy()
173 		nnsi->nstgid = nsi->nstgid;  in nsinfo__copy()
174 		nnsi->need_setns = nsi->need_setns;  in nsinfo__copy()
175 		nnsi->in_pidns = nsi->in_pidns;  in nsinfo__copy()
176 		if (nsi->mntns_path) {  in nsinfo__copy()
177 			nnsi->mntns_path = strdup(nsi->mntns_path);  in nsinfo__copy()
178 			if (!nnsi->mntns_path) {  in nsinfo__copy()
183 		refcount_set(&nnsi->refcnt, 1);  in nsinfo__copy()
191 	zfree(&nsi->mntns_path);  in nsinfo__delete()
198 		refcount_inc(&nsi->refcnt);  in nsinfo__get()
204 	if (nsi && refcount_dec_and_test(&nsi->refcnt))  in nsinfo__put()
212 	int oldns = -1;  in nsinfo__mountns_enter()
213 	int newns = -1;  in nsinfo__mountns_enter()
219 	nc->oldns = -1;  in nsinfo__mountns_enter()
220 	nc->newns = -1;  in nsinfo__mountns_enter()
222 	if (!nsi || !nsi->need_setns)  in nsinfo__mountns_enter()
225 	if (snprintf(curpath, PATH_MAX, "/proc/self/ns/mnt") >= PATH_MAX)  in nsinfo__mountns_enter()
236 	newns = open(nsi->mntns_path, O_RDONLY);  in nsinfo__mountns_enter()
243 	nc->oldcwd = oldcwd;  in nsinfo__mountns_enter()
244 	nc->oldns = oldns;  in nsinfo__mountns_enter()
245 	nc->newns = newns;  in nsinfo__mountns_enter()
250 	if (oldns > -1)  in nsinfo__mountns_enter()
252 	if (newns > -1)  in nsinfo__mountns_enter()
258 	if (nc == NULL || nc->oldns == -1 || nc->newns == -1 || !nc->oldcwd)  in nsinfo__mountns_exit()
261 	setns(nc->oldns, CLONE_NEWNS);  in nsinfo__mountns_exit()
263 	if (nc->oldcwd) {  in nsinfo__mountns_exit()
264 		WARN_ON_ONCE(chdir(nc->oldcwd));  in nsinfo__mountns_exit()
265 		zfree(&nc->oldcwd);  in nsinfo__mountns_exit()
268 	if (nc->oldns > -1) {  in nsinfo__mountns_exit()
269 		close(nc->oldns);  in nsinfo__mountns_exit()
270 		nc->oldns = -1;  in nsinfo__mountns_exit()
273 	if (nc->newns > -1) {  in nsinfo__mountns_exit()
274 		close(nc->newns);  in nsinfo__mountns_exit()
275 		nc->newns = -1;  in nsinfo__mountns_exit()