pid namespaces: helpers to obtain pid numbers

When showing pid to user or getting the pid numerical id for in-kernel use the
value of this id may differ depending on the namespace.

This set of helpers is used to get the global pid nr, the virtual (i.e.  seen
by task in its namespace) nr and the nr as it is seen from the specified
namespace.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/pid.h b/include/linux/pid.h
index 67470ade32123c022b0b4a44d96eccceadc509da..c5fee61bfb4f9c691eeadbf07b48e741b7483d01 100644 (file)
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -114,11 +114,33 @@ extern struct pid *find_ge_pid(int nr);
 extern struct pid *alloc_pid(struct pid_namespace *ns);
 extern void FASTCALL(free_pid(struct pid *pid));
 
+/*
+ * 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;
+ * pid_vnr()   : virtual id, i.e. the id seen from the namespace this pid
+ *               belongs to. this only makes sence when called in the
+ *               context of the task that belongs to the same namespace;
+ * pid_nr_ns() : id seen from the ns specified.
+ *
+ * see also task_xid_nr() etc in include/linux/sched.h
+ */
+
 static inline pid_t pid_nr(struct pid *pid)
 {
        pid_t nr = 0;
        if (pid)
-               nr = pid->nr;
+               nr = pid->numbers[0].nr;
+       return nr;
+}
+
+pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns);
+
+static inline pid_t pid_vnr(struct pid *pid)
+{
+       pid_t nr = 0;
+       if (pid)
+               nr = pid->numbers[pid->level].nr;
        return nr;
 }
 

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 47cf81d6204782693d9f7f36d0de2f3b518c7169..77e8cad3b17a0e979bce4180cb50a598fded76b2 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1188,16 +1188,6 @@ static inline int rt_task(struct task_struct *p)
        return rt_prio(p->prio);
 }
 
-static inline pid_t task_pgrp_nr(struct task_struct *tsk)
-{
-       return tsk->signal->pgrp;
-}
-
-static inline pid_t task_session_nr(struct task_struct *tsk)
-{
-       return tsk->signal->__session;
-}
-
 static inline void set_task_session(struct task_struct *tsk, pid_t session)
 {
        tsk->signal->__session = session;
@@ -1223,6 +1213,104 @@ static inline struct pid *task_session(struct task_struct *task)
        return task->group_leader->pids[PIDTYPE_SID].pid;
 }
 
+struct pid_namespace;
+
+/*
+ * the helpers to get the task's different pids as they are seen
+ * from various namespaces
+ *
+ * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
+ * task_xid_vnr()    : virtual id, i.e. the id seen from the namespace the task
+ *                     belongs to. this only makes sence when called in the
+ *                     context of the task that belongs to the same namespace;
+ * task_xid_nr_ns()  : id seen from the ns specified;
+ *
+ * set_task_vxid()   : assigns a virtual id to a task;
+ *
+ * task_ppid_nr_ns() : the parent's id as seen from the namespace specified.
+ *                     the result depends on the namespace and whether the
+ *                     task in question is the namespace's init. e.g. for the
+ *                     namespace's init this will return 0 when called from
+ *                     the namespace of this init, or appropriate id otherwise.
+ *
+ *
+ * see also pid_nr() etc in include/linux/pid.h
+ */
+
+static inline pid_t task_pid_nr(struct task_struct *tsk)
+{
+       return tsk->pid;
+}
+
+static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
+               struct pid_namespace *ns)
+{
+       return pid_nr_ns(task_pid(tsk), ns);
+}
+
+static inline pid_t task_pid_vnr(struct task_struct *tsk)
+{
+       return pid_vnr(task_pid(tsk));
+}
+
+
+static inline pid_t task_tgid_nr(struct task_struct *tsk)
+{
+       return tsk->tgid;
+}
+
+static inline pid_t task_tgid_nr_ns(struct task_struct *tsk,
+               struct pid_namespace *ns)
+{
+       return pid_nr_ns(task_tgid(tsk), ns);
+}
+
+static inline pid_t task_tgid_vnr(struct task_struct *tsk)
+{
+       return pid_vnr(task_tgid(tsk));
+}
+
+
+static inline pid_t task_pgrp_nr(struct task_struct *tsk)
+{
+       return tsk->signal->pgrp;
+}
+
+static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
+               struct pid_namespace *ns)
+{
+       return pid_nr_ns(task_pgrp(tsk), ns);
+}
+
+static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
+{
+       return pid_vnr(task_pgrp(tsk));
+}
+
+
+static inline pid_t task_session_nr(struct task_struct *tsk)
+{
+       return tsk->signal->__session;
+}
+
+static inline pid_t task_session_nr_ns(struct task_struct *tsk,
+               struct pid_namespace *ns)
+{
+       return pid_nr_ns(task_session(tsk), ns);
+}
+
+static inline pid_t task_session_vnr(struct task_struct *tsk)
+{
+       return pid_vnr(task_session(tsk));
+}
+
+
+static inline pid_t task_ppid_nr_ns(struct task_struct *tsk,
+               struct pid_namespace *ns)
+{
+       return pid_nr_ns(task_pid(rcu_dereference(tsk->real_parent)), ns);
+}
+
 /**
  * pid_alive - check that a task structure is not stale
  * @p: Task structure to be checked.

diff --git a/kernel/pid.c b/kernel/pid.c
index 8132a6ddfa10b18396fe07bf53325b44a7628d7d..6eb14841b7346cbbc4387f5e81ba1689375fdc3d 100644 (file)
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -376,6 +376,19 @@ struct pid *find_get_pid(pid_t nr)
        return pid;
 }
 
+pid_t pid_nr_ns(struct pid *pid, struct pid_namespace *ns)
+{
+       struct upid *upid;
+       pid_t nr = 0;
+
+       if (pid && ns->level <= pid->level) {
+               upid = &pid->numbers[ns->level];
+               if (upid->ns == ns)
+                       nr = upid->nr;
+       }
+       return nr;
+}
+
 /*
  * Used by proc to find the first pid that is greater then or equal to nr.
  *