Pidns: make full use of xxx_vnr() calls

Some time ago the xxx_vnr() calls (e.g.  pid_vnr or find_task_by_vpid) were
_all_ converted to operate on the current pid namespace.  After this each call
like xxx_nr_ns(foo, current->nsproxy->pid_ns) is nothing but a xxx_vnr(foo)
one.

Switch all the xxx_nr_ns() callers to use the xxx_vnr() calls where
appropriate.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Reviewed-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 8 insertions, 17 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 2567de3487bd..81345ba4b253 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1174,7 +1174,7 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
 {
         unsigned long state;
         int retval, status, traced;
-        pid_t pid = task_pid_nr_ns(p, current->nsproxy->pid_ns);
+        pid_t pid = task_pid_vnr(p);
 
         if (unlikely(noreap)) {
                 uid_t uid = p->uid;
@@ -1369,7 +1369,7 @@ unlock_sig:
          * possibly take page faults for user memory.
          */
         get_task_struct(p);
-        pid = task_pid_nr_ns(p, current->nsproxy->pid_ns);
+        pid = task_pid_vnr(p);
         why = (p->ptrace & PT_PTRACED) ? CLD_TRAPPED : CLD_STOPPED;
         read_unlock(&tasklist_lock);
 
@@ -1428,7 +1428,7 @@ static int wait_task_continued(struct task_struct *p, int noreap,
                 p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
         spin_unlock_irq(&p->sighand->siglock);
 
-        pid = task_pid_nr_ns(p, current->nsproxy->pid_ns);
+        pid = task_pid_vnr(p);
         uid = p->uid;
         get_task_struct(p);
         read_unlock(&tasklist_lock);
diff --git a/kernel/fork.c b/kernel/fork.c
index ca54d9704644..31a2bad63a08 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1488,13 +1488,7 @@ long do_fork(unsigned long clone_flags,
         if (!IS_ERR(p)) {
                 struct completion vfork;
 
-                /*
-                 * this is enough to call pid_nr_ns here, but this if
-                 * improves optimisation of regular fork()
-                 */
-                nr = (clone_flags & CLONE_NEWPID) ?
-                        task_pid_nr_ns(p, current->nsproxy->pid_ns) :
-                                task_pid_vnr(p);
+                nr = task_pid_vnr(p);
 
                 if (clone_flags & CLONE_PARENT_SETTID)
                         put_user(nr, parent_tidptr);
diff --git a/kernel/sys.c b/kernel/sys.c
index 5a61f8071b8e..a626116af5db 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -991,17 +991,14 @@ asmlinkage long sys_getpgid(pid_t pid)
         else {
                 int retval;
                 struct task_struct *p;
-                struct pid_namespace *ns;
-
-                ns = current->nsproxy->pid_ns;
 
                 read_lock(&tasklist_lock);
-                p = find_task_by_pid_ns(pid, ns);
+                p = find_task_by_vpid(pid);
                 retval = -ESRCH;
                 if (p) {
                         retval = security_task_getpgid(p);
                         if (!retval)
-                                retval = task_pgrp_nr_ns(p, ns);
+                                retval = task_pgrp_vnr(p);
                 }
                 read_unlock(&tasklist_lock);
                 return retval;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9dadc9d88a03..89d963ffbb01 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2488,7 +2488,7 @@ static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp
         pid_t tmp;
         int r;
 
-        tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
+        tmp = pid_vnr(cad_pid);
 
         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
                                lenp, ppos, NULL, NULL);
diff --git a/kernel/timer.c b/kernel/timer.c
index 70b29b59343f..1c4183cd8bdb 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -979,7 +979,7 @@ asmlinkage long sys_getppid(void)
         int pid;
 
         rcu_read_lock();
-        pid = task_tgid_nr_ns(current->real_parent, current->nsproxy->pid_ns);
+        pid = task_tgid_vnr(current->real_parent);
         rcu_read_unlock();
 
         return pid;