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, also a preparation for the next patch. Signed-off-by: Oleg Nesterov <[email protected]> Acked-by: "Eric W. Biederman" <[email protected]> Acked-by: Pavel Emelyanov <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
niw · Feb 8, 2008 · 8520d7c · 8520d7c
1 parent e4cc0a9
commit 8520d7c
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Showing 4 changed files with 18 additions and 18 deletions.
diff --git a/include/linux/sched.h b/include/linux/sched.h
@@ -1632,7 +1632,7 @@ extern struct task_struct *find_task_by_vpid(pid_t nr);
 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);

diff --git a/init/main.c b/init/main.c
@@ -833,7 +833,7 @@ static int __init kernel_init(void * unused)
 	 */
 	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(setup_max_cpus);

diff --git a/kernel/exit.c b/kernel/exit.c
@@ -293,26 +293,27 @@ 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);
 }
 
@@ -383,7 +384,11 @@ 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 */
@@ -398,11 +403,6 @@ 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);

diff --git a/kernel/sys.c b/kernel/sys.c
@@ -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;