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pid namespaces: make alloc_pid(), free_pid() and put_pid() work with struct upid

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Each struct upid element of struct pid has to be initialized properly, i.e.
its nr mst be allocated from appropriate pidmap and ns set to appropriate
namespace.

When allocating a new pid, we need to know the namespace this pid will live
in, so the additional argument is added to alloc_pid().

On the other hand, the rest of the kernel still uses the pid->nr and
pid->pid_chain fields, so these ones are still initialized, but this will be
removed soon.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Emelyanov 2007-10-18 23:40:05 -07:00 • committed by Linus Torvalds
parent faacbfd3a6
commit 8ef047aaae
3 changed files with 36 additions and 17 deletions
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2
kernel/fork.c
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@ -1041,7 +1041,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
goto bad_fork_cleanup_put_domain;
if (pid != &init_struct_pid) {
pid = alloc_pid();
pid = alloc_pid(task_active_pid_ns(p));
if (!pid)
goto bad_fork_put_binfmt_module;
}