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authorSerge E. Hallyn <serue@us.ibm.com>2007-10-19 02:39:52 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 14:53:37 -0400
commitb460cbc581a53cc088ceba80608021dd49c63c43 (patch)
tree83c28d0adbc15f4157c77b40fa60c40a71cb8673 /include/linux/sched.h
parent3743ca05ff464b8a9e345c08a6c9ce30485f9805 (diff)
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>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index df6049e5e8bf..47cf81d62047 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1237,12 +1237,20 @@ static inline int pid_alive(struct task_struct *p)
1237} 1237}
1238 1238
1239/** 1239/**
1240 * is_init - check if a task structure is init 1240 * is_global_init - check if a task structure is init
1241 * @tsk: Task structure to be checked. 1241 * @tsk: Task structure to be checked.
1242 * 1242 *
1243 * Check if a task structure is the first user space task the kernel created. 1243 * Check if a task structure is the first user space task the kernel created.
1244 *
1245 * TODO: We should inline this function after some cleanups in pid_namespace.h
1246 */
1247extern int is_global_init(struct task_struct *tsk);
1248
1249/*
1250 * is_container_init:
1251 * check whether in the task is init in its own pid namespace.
1244 */ 1252 */
1245static inline int is_init(struct task_struct *tsk) 1253static inline int is_container_init(struct task_struct *tsk)
1246{ 1254{
1247 return tsk->pid == 1; 1255 return tsk->pid == 1;
1248} 1256}