[Devel] [PATCH 12/13] Show appropriate pids in proc

[Pavel Emelianov]

This is the proc-related part of the previous patch.
Since tasks are seen from two proc-s the appropriate
(virtual or global) pid must be shown.

Signed-off-by: Pavel Emelianov <xemul at openvz.org>

---

diff --git a/fs/proc/array.c b/fs/proc/array.c
index aef7b7b..f65e4c9 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -75,6 +75,7 @@
 #include <linux/cpuset.h>
 #include <linux/rcupdate.h>
 #include <linux/delayacct.h>
+#include <linux/pid_namespace.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -161,7 +162,9 @@ static inline char * task_state(struct t
 	struct group_info *group_info;
 	int g;
 	struct fdtable *fdt = NULL;
+	struct pid_namespace *ns;
 
+	ns = current->nsproxy->pid_ns;
 	rcu_read_lock();
 	buffer += sprintf(buffer,
 		"State:\t%s\n"
@@ -174,9 +177,12 @@ static inline char * task_state(struct t
 		"Gid:\t%d\t%d\t%d\t%d\n",
 		get_task_state(p),
 		(p->sleep_avg/1024)*100/(1020000000/1024),
-	       	p->tgid, p->pid,
-	       	pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
-		pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
+	       	__task_tgid_nr_ns(p, ns),
+		__task_pid_nr_ns(p, ns),
+	       	pid_alive(p) ? task_ppid_nr_ns(p, ns) : 0,
+		pid_alive(p) && p->ptrace ?
+			__task_tgid_nr_ns(
+				rcu_dereference(p->parent), ns) : 0,
 		p->uid, p->euid, p->suid, p->fsuid,
 		p->gid, p->egid, p->sgid, p->fsgid);
 
@@ -349,6 +355,7 @@ static int do_task_stat(struct task_stru
 	rcu_read_lock();
 	if (lock_task_sighand(task, &flags)) {
 		struct signal_struct *sig = task->signal;
+		struct pid_namespace *ns = current->nsproxy->pid_ns;
 
 		if (sig->tty) {
 			tty_pgrp = pid_nr(sig->tty->pgrp);
@@ -381,9 +388,9 @@ static int do_task_stat(struct task_stru
 			stime = cputime_add(stime, sig->stime);
 		}
 
-		sid = task_session_nr(task);
-		pgid = task_pgrp_nr(task);
-		ppid = rcu_dereference(task->real_parent)->tgid;
+		sid = __task_session_nr_ns(task, ns);
+		pgid = __task_pgrp_nr_ns(task, ns);
+		ppid = task_ppid_nr_ns(task, ns);
 
 		unlock_task_sighand(task, &flags);
 	}
@@ -414,7 +421,7 @@ static int do_task_stat(struct task_stru
 	res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %u %lu \
 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
-		task->pid,
+		task_pid_nr_ns(task),
 		tcomm,
 		state,
 		ppid,
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 8b426e9..e9811ec 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -73,6 +73,7 @@
 #include <linux/poll.h>
 #include <linux/nsproxy.h>
 #include <linux/oom.h>
+#include <linux/pid_namespace.h>
 #include "internal.h"
 
 /* NOTE:
@@ -1755,14 +1756,14 @@ static int proc_self_readlink(struct den
 			      int buflen)
 {
 	char tmp[PROC_NUMBUF];
-	sprintf(tmp, "%d", current->tgid);
+	sprintf(tmp, "%d", task_tgid_vnr(current));
 	return vfs_readlink(dentry,buffer,buflen,tmp);
 }
 
 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
 	char tmp[PROC_NUMBUF];
-	sprintf(tmp, "%d", current->tgid);
+	sprintf(tmp, "%d", task_tgid_vnr(current));
 	return ERR_PTR(vfs_follow_link(nd,tmp));
 }