[PATCH 2/3] teach set_special_pids() to use struct pid

[Oleg Nesterov <oleg@tv-sign.ru>]

Change set_special_pids() to work with struct pid, not pid_t from global name
space. This again speedups and imho cleanups the code.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- PT/include/linux/sched.h~2_set_special_pids	2007-11-26 15:52:15.000000000 +0300
+++ PT/include/linux/sched.h	2007-11-26 16:47:35.000000000 +0300
@@ -1568,7 +1568,7 @@ extern struct task_struct *find_task_by_
 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
 		struct pid_namespace *ns);
 
-extern void __set_special_pids(pid_t session, pid_t pgrp);
+extern void __set_special_pids(struct pid *pid);
 
 /* per-UID process charging. */
 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
--- PT/kernel/exit.c~2_set_special_pids	2007-11-26 15:52:15.000000000 +0300
+++ PT/kernel/exit.c	2007-11-26 16:47:35.000000000 +0300
@@ -295,26 +295,27 @@ static void reparent_to_kthreadd(void)
 	switch_uid(INIT_USER);
 }
 
-void __set_special_pids(pid_t session, pid_t pgrp)
+void __set_special_pids(struct pid *pid)
 {
 	struct task_struct *curr = current->group_leader;
+	pid_t nr = pid_nr(pid);
 
-	if (task_session_nr(curr) != session) {
+	if (task_session(curr) != pid) {
 		detach_pid(curr, PIDTYPE_SID);
-		set_task_session(curr, session);
-		attach_pid(curr, PIDTYPE_SID, find_pid(session));
+		attach_pid(curr, PIDTYPE_SID, pid);
+		set_task_session(curr, nr);
 	}
-	if (task_pgrp_nr(curr) != pgrp) {
+	if (task_pgrp(curr) != pid) {
 		detach_pid(curr, PIDTYPE_PGID);
-		set_task_pgrp(curr, pgrp);
-		attach_pid(curr, PIDTYPE_PGID, find_pid(pgrp));
+		attach_pid(curr, PIDTYPE_PGID, pid);
+		set_task_pgrp(curr, nr);
 	}
 }
 
-static void set_special_pids(pid_t session, pid_t pgrp)
+static void set_special_pids(struct pid *pid)
 {
 	write_lock_irq(&tasklist_lock);
-	__set_special_pids(session, pgrp);
+	__set_special_pids(pid);
 	write_unlock_irq(&tasklist_lock);
 }
 
@@ -385,7 +386,11 @@ void daemonize(const char *name, ...)
 	 */
 	current->flags |= PF_NOFREEZE;
 
-	set_special_pids(1, 1);
+	if (current->nsproxy != &init_nsproxy) {
+		get_nsproxy(&init_nsproxy);
+		switch_task_namespaces(current, &init_nsproxy);
+	}
+	set_special_pids(find_pid(1));
 	proc_clear_tty(current);
 
 	/* Block and flush all signals */
@@ -400,11 +405,6 @@ void daemonize(const char *name, ...)
 	current->fs = fs;
 	atomic_inc(&fs->count);
 
-	if (current->nsproxy != init_task.nsproxy) {
-		get_nsproxy(init_task.nsproxy);
-		switch_task_namespaces(current, init_task.nsproxy);
-	}
-
 	exit_files(current);
 	current->files = init_task.files;
 	atomic_inc(&current->files->count);
--- PT/kernel/sys.c~2_set_special_pids	2007-11-26 16:10:43.000000000 +0300
+++ PT/kernel/sys.c	2007-11-26 16:48:02.000000000 +0300
@@ -1065,7 +1065,7 @@ asmlinkage long sys_setsid(void)
 		goto out;
 
 	group_leader->signal->leader = 1;
-	__set_special_pids(pid_nr(sid), pid_nr(sid));
+	__set_special_pids(sid);
 
 	spin_lock(&group_leader->sighand->siglock);
 	group_leader->signal->tty = NULL;
--- PT/init/main.c~2_set_special_pids	2007-11-26 15:52:15.000000000 +0300
+++ PT/init/main.c	2007-11-26 16:56:24.000000000 +0300
@@ -829,7 +829,7 @@ static int __init kernel_init(void * unu
 	 */
 	init_pid_ns.child_reaper = current;
 
-	__set_special_pids(1, 1);
+	__set_special_pids(task_pid(current));
 	cad_pid = task_pid(current);
 
 	smp_prepare_cpus(max_cpus);