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sys_getsid: don't use ->nsproxy directly 

With the new semantics of find_vpid() we don't need to play with ->nsproxy
explicitely, _vxx() do the right things.

Also s/tasklist/rcu/.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-02-08 04:19:15 -08:00 committed by Linus Torvalds
parent 44c4e1b258
commit ac9a8e3f0f
1 changed files with 4 additions and 7 deletions
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11
kernel/sys.c
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@ -1025,19 +1025,16 @@ asmlinkage long sys_getsid(pid_t pid)
else {
int retval;
struct task_struct *p;
struct pid_namespace *ns;
ns = current->nsproxy->pid_ns;
read_lock(&tasklist_lock);
p = find_task_by_pid_ns(pid, ns);
rcu_read_lock();
p = find_task_by_vpid(pid);
retval = -ESRCH;
if (p) {
retval = security_task_getsid(p);
if (!retval)
retval = task_session_nr_ns(p, ns);
retval = task_session_vnr(p);
}
read_unlock(&tasklist_lock);
rcu_read_unlock();
return retval;
}
}