*/
struct upid {
- /* Try to keep pid_chain in the same cacheline as nr for find_pid */
+ /* Try to keep pid_chain in the same cacheline as nr for find_vpid */
int nr;
struct pid_namespace *ns;
struct hlist_node pid_chain;
* or rcu_read_lock() held.
*
* find_pid_ns() finds the pid in the namespace specified
- * find_pid() find the pid by its global id, i.e. in the init namespace
* find_vpid() finr the pid by its virtual id, i.e. in the current namespace
*
- * see also find_task_by_pid() set in include/linux/sched.h
+ * see also find_task_by_vpid() set in include/linux/sched.h
*/
extern struct pid *find_pid_ns(int nr, struct pid_namespace *ns);
extern struct pid *find_vpid(int nr);
-extern struct pid *find_pid(int nr);
/*
* Lookup a PID in the hash table, and return with it's count elevated.
extern void free_pid(struct pid *pid);
/*
+ * ns_of_pid() returns the pid namespace in which the specified pid was
+ * allocated.
+ *
+ * NOTE:
+ * ns_of_pid() is expected to be called for a process (task) that has
+ * an attached 'struct pid' (see attach_pid(), detach_pid()) i.e @pid
+ * is expected to be non-NULL. If @pid is NULL, caller should handle
+ * the resulting NULL pid-ns.
+ */
+static inline struct pid_namespace *ns_of_pid(struct pid *pid)
+{
+ struct pid_namespace *ns = NULL;
+ if (pid)
+ ns = pid->numbers[pid->level].ns;
+ return ns;
+}
+
+/*
* the helpers to get the pid's id seen from different namespaces
*
* pid_nr() : global id, i.e. the id seen from the init namespace;
#define do_each_pid_task(pid, type, task) \
do { \
struct hlist_node *pos___; \
- if (pid != NULL) \
+ if ((pid) != NULL) \
hlist_for_each_entry_rcu((task), pos___, \
- &pid->tasks[type], pids[type].node) {
+ &(pid)->tasks[type], pids[type].node) {
/*
* Both old and new leaders may be attached to
} \
} while (0)
+#define do_each_pid_thread(pid, type, task) \
+ do_each_pid_task(pid, type, task) { \
+ struct task_struct *tg___ = task; \
+ do {
+
+#define while_each_pid_thread(pid, type, task) \
+ } while_each_thread(tg___, task); \
+ task = tg___; \
+ } while_each_pid_task(pid, type, task)
#endif /* _LINUX_PID_H */