projects/linux·commit faacbfd3

pid namespaces: add support for pid namespaces hierarchy

faacbfd3 · Pavel Emelyanov <[email protected]> · 2007-10-18 23:40:04 -07:00

Each namespace has a parent and is characterized by its "level".  Level is the
number of the namespace generation.  E.g.  init namespace has level 0, after
cloning new one it will have level 1, the next one - 2 and so on and so forth.
 This level is not explicitly limited.

True hierarchy must have some way to find each namespace's children, but it is
not used in the patches, so this ability is not added (yet).

Signed-off-by: Pavel Emelyanov <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Sukadev Bhattiprolu <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Commit
faacbfd3a6808bf87d8f353b42eceeaba2c78a47
Parents
4c3f2ead

Changes

2 files changed · +4 −1

FileStatusAddDelContent
include/linux/pid_namespace.hmodified+2−0View file
kernel/pid.cmodified+2−1View file

include/linux/pid_namespace.h

View file
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index aea13ec..14376eb 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -21,6 +21,8 @@ struct pid_namespace {
int last_pid;
struct task_struct *child_reaper;
struct kmem_cache *pid_cachep;
+ int level;
+ struct pid_namespace *parent;
};
extern struct pid_namespace init_pid_ns;

kernel/pid.c

View file
diff --git a/kernel/pid.c b/kernel/pid.c
index bb07851..c7346fb 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -67,7 +67,8 @@ struct pid_namespace init_pid_ns = {
[ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
},
.last_pid = 0,
- .child_reaper = &init_task
+ .level = 0,
+ .child_reaper = &init_task,
};
int is_global_init(struct task_struct *tsk)