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Message-ID: <20071126142555.GA16528@tv-sign.ru>
Date: Mon, 26 Nov 2007 17:25:55 +0300
From: Oleg Nesterov <oleg@...sign.ru>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
Pavel Emelyanov <xemul@...nvz.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] teach set_special_pids() to use struct pid
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@...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(¤t->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);
-
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