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 <oleg@tv-sign.ru> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1632,7 +1632,7 @@ extern struct task_struct *find_task_by_vpid(pid_t nr);
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extern struct task_struct *find_task_by_pid_ns(pid_t nr,
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extern struct task_struct *find_task_by_pid_ns(pid_t nr,
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struct pid_namespace *ns);
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struct pid_namespace *ns);
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extern void __set_special_pids(pid_t session, pid_t pgrp);
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extern void __set_special_pids(struct pid *pid);
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/* per-UID process charging. */
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/* per-UID process charging. */
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extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
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extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
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@ -833,7 +833,7 @@ static int __init kernel_init(void * unused)
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*/
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*/
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init_pid_ns.child_reaper = current;
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init_pid_ns.child_reaper = current;
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__set_special_pids(1, 1);
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__set_special_pids(task_pid(current));
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cad_pid = task_pid(current);
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cad_pid = task_pid(current);
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smp_prepare_cpus(setup_max_cpus);
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smp_prepare_cpus(setup_max_cpus);
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@ -293,26 +293,27 @@ static void reparent_to_kthreadd(void)
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switch_uid(INIT_USER);
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switch_uid(INIT_USER);
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}
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}
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void __set_special_pids(pid_t session, pid_t pgrp)
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void __set_special_pids(struct pid *pid)
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{
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{
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struct task_struct *curr = current->group_leader;
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struct task_struct *curr = current->group_leader;
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pid_t nr = pid_nr(pid);
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if (task_session_nr(curr) != session) {
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if (task_session(curr) != pid) {
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detach_pid(curr, PIDTYPE_SID);
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detach_pid(curr, PIDTYPE_SID);
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set_task_session(curr, session);
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attach_pid(curr, PIDTYPE_SID, pid);
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attach_pid(curr, PIDTYPE_SID, find_pid(session));
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set_task_session(curr, nr);
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}
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}
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if (task_pgrp_nr(curr) != pgrp) {
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if (task_pgrp(curr) != pid) {
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detach_pid(curr, PIDTYPE_PGID);
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detach_pid(curr, PIDTYPE_PGID);
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set_task_pgrp(curr, pgrp);
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attach_pid(curr, PIDTYPE_PGID, pid);
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attach_pid(curr, PIDTYPE_PGID, find_pid(pgrp));
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set_task_pgrp(curr, nr);
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}
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}
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}
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}
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static void set_special_pids(pid_t session, pid_t pgrp)
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static void set_special_pids(struct pid *pid)
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{
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{
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write_lock_irq(&tasklist_lock);
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write_lock_irq(&tasklist_lock);
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__set_special_pids(session, pgrp);
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__set_special_pids(pid);
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write_unlock_irq(&tasklist_lock);
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write_unlock_irq(&tasklist_lock);
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}
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}
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@ -383,7 +384,11 @@ void daemonize(const char *name, ...)
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*/
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*/
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current->flags |= PF_NOFREEZE;
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current->flags |= PF_NOFREEZE;
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set_special_pids(1, 1);
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if (current->nsproxy != &init_nsproxy) {
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get_nsproxy(&init_nsproxy);
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switch_task_namespaces(current, &init_nsproxy);
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}
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set_special_pids(find_pid(1));
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proc_clear_tty(current);
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proc_clear_tty(current);
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/* Block and flush all signals */
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/* Block and flush all signals */
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@ -398,11 +403,6 @@ void daemonize(const char *name, ...)
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current->fs = fs;
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current->fs = fs;
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atomic_inc(&fs->count);
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atomic_inc(&fs->count);
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if (current->nsproxy != init_task.nsproxy) {
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get_nsproxy(init_task.nsproxy);
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switch_task_namespaces(current, init_task.nsproxy);
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}
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exit_files(current);
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exit_files(current);
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current->files = init_task.files;
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current->files = init_task.files;
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atomic_inc(¤t->files->count);
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atomic_inc(¤t->files->count);
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@ -1065,7 +1065,7 @@ asmlinkage long sys_setsid(void)
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goto out;
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goto out;
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group_leader->signal->leader = 1;
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group_leader->signal->leader = 1;
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__set_special_pids(pid_nr(sid), pid_nr(sid));
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__set_special_pids(sid);
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spin_lock(&group_leader->sighand->siglock);
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spin_lock(&group_leader->sighand->siglock);
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group_leader->signal->tty = NULL;
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group_leader->signal->tty = NULL;
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