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Sukadev Bhattiprolu 2894d650cd pid namespaces: define and use task_active_pid_ns() wrapper 
With multiple pid namespaces, a process is known by some pid_t in every
ancestor pid namespace.  Every time the process forks, the child process also
gets a pid_t in every ancestor pid namespace.

While a process is visible in >=1 pid namespaces, it can see pid_t's in only
one pid namespace.  We call this pid namespace it's "active pid namespace",
and it is always the youngest pid namespace in which the process is known.

This patch defines and uses a wrapper to find the active pid namespace of a
process.  The implementation of the wrapper will be changed in when support
for multiple pid namespaces are added.

Changelog:
	2.6.22-rc4-mm2-pidns1:
	- [Pavel Emelianov, Alexey Dobriyan] Back out the change to use
	  task_active_pid_ns() in child_reaper() since task->nsproxy
	  can be NULL during task exit (so child_reaper() continues to
	  use init_pid_ns).

	  to implement child_reaper() since init_pid_ns.child_reaper to
	  implement child_reaper() since tsk->nsproxy can be NULL during exit.

	2.6.21-rc6-mm1:
	- Rename task_pid_ns() to task_active_pid_ns() to reflect that a
	  process can have multiple pid namespaces.

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: Serge Hallyn <serue@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>
2007-10-19 11:53:37 -07:00
..
irq Compile handle_percpu_irq even for uniprocessor kernels 2007-10-17 08:43:00 -07:00
power Hibernation: Enter platform hibernation state in a consistent way 2007-10-18 14:37:20 -07:00
time x86: C1E late detection fix. Really switch off lapic timer 2007-10-17 20:15:13 +02:00
.gitignore
acct.c whitespace fixes: process accounting 2007-10-18 14:37:24 -07:00
audit.c whitespace fixes: system auditing 2007-10-18 14:37:25 -07:00
audit.h Audit: add TTY input auditing 2007-07-16 09:05:47 -07:00
auditfilter.c whitespace fixes: audit filtering 2007-10-18 14:37:24 -07:00
auditsc.c whitespace fixes: syscall auditing 2007-10-18 14:37:25 -07:00
capability.c whitespace fixes: capability syscalls 2007-10-18 14:37:25 -07:00
cgroup.c Add cgroupstats 2007-10-19 11:53:36 -07:00
cgroup_debug.c Task Control Groups: simple task cgroup debug info subsystem 2007-10-19 11:53:36 -07:00
compat.c Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt 2007-10-18 15:12:41 -07:00
configs.c use simple_read_from_buffer in kernel/ 2007-05-09 12:30:49 -07:00
cpu.c cpu hotplug: cpu: deliver CPU_UP_CANCELED only to NOTIFY_OKed callbacks with CPU_UP_PREPARE 2007-10-18 14:37:21 -07:00
cpu_acct.c Task Control Groups: example CPU accounting subsystem 2007-10-19 11:53:36 -07:00
cpuset.c Task Control Groups: make cpusets a client of cgroups 2007-10-19 11:53:36 -07:00
delayacct.c Add scaled time to taskstats based process accounting 2007-10-18 14:37:28 -07:00
dma.c whitespace fixes: DMA channel allocator 2007-10-18 14:37:24 -07:00
exec_domain.c whitespace fixes: execution domains 2007-10-18 14:37:26 -07:00
exit.c pid namespaces: round up the API 2007-10-19 11:53:37 -07:00
extable.c
fork.c pid namespaces: round up the API 2007-10-19 11:53:37 -07:00
futex.c sparse pointer use of zero as null 2007-10-18 14:37:31 -07:00
futex_compat.c robust futex thread exit race 2007-10-01 07:52:23 -07:00
hrtimer.c hrtimer: Rework hrtimer_nanosleep to make sys_compat_nanosleep easier 2007-10-18 22:54:18 +02:00
itimer.c whitespace fixes: interval timers 2007-10-18 14:37:26 -07:00
kallsyms.c kallsyms: make KSYM_NAME_LEN include space for trailing '\0' 2007-07-17 10:23:03 -07:00
Kconfig.hz [PATCH] HZ: 300Hz support 2006-12-07 08:39:36 -08:00
Kconfig.preempt Move PREEMPT_NOTIFIERS into an always-included Kconfig 2007-10-17 08:42:55 -07:00
kexec.c sparse pointer use of zero as null 2007-10-18 14:37:31 -07:00
kfifo.c is_power_of_2: kernel/kfifo.c 2007-07-16 09:05:50 -07:00
kmod.c Restore call_usermodehelper_pipe() behaviour 2007-09-11 17:21:20 -07:00
kprobes.c kprobes: support kretprobe blacklist 2007-10-16 09:43:10 -07:00
ksysfs.c add-vmcore: cleanup the coding style according to Andrew's comments 2007-10-17 08:42:54 -07:00
kthread.c kthread: silence bogus section mismatch warning 2007-07-31 15:39:42 -07:00
latency.c [PATCH] severing module.h->sched.h 2006-12-04 02:00:22 -05:00
lockdep.c lockdep: syscall exit check 2007-10-11 22:11:12 +02:00
lockdep_internals.h [PATCH] lockdep: more chains 2006-12-07 08:39:43 -08:00
lockdep_proc.c lockdep: Avoid /proc/lockdep & lock_stat infinite output 2007-10-11 22:11:11 +02:00
Makefile cgroups: implement namespace tracking subsystem 2007-10-19 11:53:37 -07:00
module.c whitespace fixes: module loading 2007-10-18 14:37:25 -07:00
mutex-debug.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
mutex-debug.h
mutex.c lockdep: fixup mutex annotations 2007-10-11 22:11:12 +02:00
mutex.h
notifier.c Add kernel/notifier.c 2007-10-19 11:53:34 -07:00
ns_cgroup.c cgroups: implement namespace tracking subsystem 2007-10-19 11:53:37 -07:00
nsproxy.c pid namespaces: define and use task_active_pid_ns() wrapper 2007-10-19 11:53:37 -07:00
panic.c whitespace fixes: panic handling 2007-10-18 14:37:25 -07:00
params.c param_sysfs_builtin memchr argument fix 2007-10-18 14:37:21 -07:00
pid.c pid namespaces: define and use task_active_pid_ns() wrapper 2007-10-19 11:53:37 -07:00
posix-cpu-timers.c sched: make posix-cpu-timers use CFS's accounting information 2007-07-09 18:51:58 +02:00
posix-timers.c hrtimer: Rework hrtimer_nanosleep to make sys_compat_nanosleep easier 2007-10-18 22:54:18 +02:00
printk.c serial: turn serial console suspend a boot rather than compile time option 2007-10-18 14:37:19 -07:00
profile.c make kernel/profile.c:time_hook static 2007-10-17 08:42:55 -07:00
ptrace.c m32r: convert to generic sys_ptrace 2007-10-16 09:43:04 -07:00
rcupdate.c Clean up duplicate includes in kernel/ 2007-10-17 08:42:48 -07:00
rcutorture.c Make rcutorture RNG use temporal entropy 2007-10-17 08:42:53 -07:00
relay.c whitespace fixes: relayfs 2007-10-18 14:37:24 -07:00
resource.c memory unplug: memory hotplug cleanup 2007-10-16 09:43:01 -07:00
rtmutex-debug.c kernel/rtmutex-debug.c: cleanups 2007-10-17 08:42:50 -07:00
rtmutex-debug.h
rtmutex-tester.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
rtmutex.c FUTEX: Tidy up the code 2007-07-16 09:05:49 -07:00
rtmutex.h
rtmutex_common.h FUTEX: Tidy up the code 2007-07-16 09:05:49 -07:00
rwsem.c lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex 2007-07-19 10:04:49 -07:00
sched.c Task Control Groups: example CPU accounting subsystem 2007-10-19 11:53:36 -07:00
sched_debug.c sched: reduce schedstat variable overhead a bit 2007-10-18 21:32:56 +02:00
sched_fair.c sched: fix new task startup crash 2007-10-17 16:55:11 +02:00
sched_idletask.c sched: mark scheduling classes as const 2007-10-15 17:00:12 +02:00
sched_rt.c sched: tidy up SCHED_RR 2007-10-15 17:00:13 +02:00
sched_stats.h sched: reduce schedstat variable overhead a bit 2007-10-18 21:32:56 +02:00
seccomp.c make seccomp zerocost in schedule 2007-07-16 09:05:50 -07:00
signal.c pid namespaces: round up the API 2007-10-19 11:53:37 -07:00
softirq.c [KERNEL]: Unexport raise_softirq_irqoff 2007-10-10 16:49:18 -07:00
softlockup.c softlockup: add a /proc tuning parameter 2007-10-17 08:42:47 -07:00
spinlock.c lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex 2007-07-19 10:04:49 -07:00
srcu.c
stacktrace.c
stop_machine.c Fix stop_machine_run problem with naughty real time process 2007-07-16 09:05:41 -07:00
sys.c pid namespaces: round up the API 2007-10-19 11:53:37 -07:00
sys_ni.c kernel/sys_ni.c: add dummy sys_ni_syscall() prototype 2007-10-17 08:42:55 -07:00
sysctl.c V3 file capabilities: alter behavior of cap_setpcap 2007-10-18 14:37:24 -07:00
sysctl_check.c V3 file capabilities: alter behavior of cap_setpcap 2007-10-18 14:37:24 -07:00
taskstats.c Add cgroupstats 2007-10-19 11:53:36 -07:00
time.c whitespace fixes: time syscalls 2007-10-18 14:37:24 -07:00
timer.c Add scaled time to taskstats based process accounting 2007-10-18 14:37:28 -07:00
tsacct.c Add scaled time to taskstats based process accounting 2007-10-18 14:37:28 -07:00
uid16.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
user.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched 2007-10-17 09:11:18 -07:00
user_namespace.c Fix user namespace exiting OOPs 2007-09-19 11:24:18 -07:00
utsname.c Fix UTS corruption during clone(CLONE_NEWUTS) 2007-09-19 11:24:17 -07:00
utsname_sysctl.c remove CONFIG_UTS_NS and CONFIG_IPC_NS 2007-07-16 09:05:47 -07:00
wait.c Fix occurrences of "the the " 2007-05-09 08:57:56 +02:00
workqueue.c fix bogus hotplug cpu warning 2007-08-27 10:27:48 -07:00