pid namespaces: define is_global_init() and is_container_init()

is_init() is an ambiguous name for the pid==1 check.  Split it into
is_global_init() and is_container_init().

A cgroup init has it's tsk->pid == 1.

A global init also has it's tsk->pid == 1 and it's active pid namespace
is the init_pid_ns.  But rather than check the active pid namespace,
compare the task structure with 'init_pid_ns.child_reaper', which is
initialized during boot to the /sbin/init process and never changes.

Changelog:

	2.6.22-rc4-mm2-pidns1:
	- Use 'init_pid_ns.child_reaper' to determine if a given task is the
	  global init (/sbin/init) process. This would improve performance
	  and remove dependence on the task_pid().

	2.6.21-mm2-pidns2:

	- [Sukadev Bhattiprolu] Changed is_container_init() calls in {powerpc,
	  ppc,avr32}/traps.c for the _exception() call to is_global_init().
	  This way, we kill only the cgroup if the cgroup's init has a
	  bug rather than force a kernel panic.

[akpm@linux-foundation.org: fix comment]
[sukadev@us.ibm.com: Use is_global_init() in arch/m32r/mm/fault.c]
[bunk@stusta.de: kernel/pid.c: remove unused exports]
[sukadev@us.ibm.com: Fix capability.c to work with threaded init]
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Acked-by: Pavel Emelianov <xemul@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Herbert Poetzel <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 3 insertions, 3 deletions

diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
index 9f38b12b4af1..8bab2b2efaff 100644
--- a/arch/x86/lib/usercopy_32.c
+++ b/arch/x86/lib/usercopy_32.c
@@ -748,7 +748,7 @@ survive:
                         retval = get_user_pages(current, current->mm,
                                         (unsigned long )to, 1, 1, 0, &pg, NULL);
 
-                        if (retval == -ENOMEM && is_init(current)) {
+                        if (retval == -ENOMEM && is_global_init(current)) {
                                 up_read(&current->mm->mmap_sem);
                                 congestion_wait(WRITE, HZ/50);
                                 goto survive;
diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c
index 6555c3d14371..4fc5e400cf0a 100644
--- a/arch/x86/mm/fault_32.c
+++ b/arch/x86/mm/fault_32.c
@@ -587,7 +587,7 @@ no_context:
  */
 out_of_memory:
         up_read(&mm->mmap_sem);
-        if (is_init(tsk)) {
+        if (is_global_init(tsk)) {
                 yield();
                 down_read(&mm->mmap_sem);
                 goto survive;
diff --git a/arch/x86/mm/fault_64.c b/arch/x86/mm/fault_64.c
index 5e0e54906c48..5149ac136a5d 100644
--- a/arch/x86/mm/fault_64.c
+++ b/arch/x86/mm/fault_64.c
@@ -554,7 +554,7 @@ no_context:
  */
 out_of_memory:
         up_read(&mm->mmap_sem);
-        if (is_init(current)) {
+        if (is_global_init(current)) {
                 yield();
                 goto again;
         }