>
> From: Sukadev Bhattiprolu <sukadev@us.ibm.com>
>
> attach_pid() currently takes a pid_t parameter and uses find_pid() to find
> the struct pid associated with the pid_t. With containers, we sometimes
> already have the struct pid and could skip the find_pid() - if we have a
> version of attach_pid() that takes a struct pid parameter.
>
> This patch renames the attach_pid() to find_attach_pid(). My next patch
> defines attach_pid() to take a struct pid.
>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
> Cc: Cedric Le Goater <clg@fr.ibm.com>
> Cc: Dave Hansen <haveblue@us.ibm.com>
> Cc: Serge Hallyn <serue@us.ibm.com>
> Cc:
containers@lists.osdl.org
>
> ---
> fs/exec.c | 2 +-
> include/linux/pid.h | 4 ++--
> kernel/exit.c | 4 ++--
> kernel/fork.c | 6 +++---
> kernel/pid.c | 3 ++-
> kernel/sys.c | 2 +-
> 6 files changed, 11 insertions(+), 10 deletions(-)
>
> Index: lx26-20-rc2-mm1/fs/exec.c
> ===================================================================
> --- lx26-20-rc2-mm1.orig/fs/exec.c 2007-01-10 14:16:17.000000000 -0800
> +++ lx26-20-rc2-mm1/fs/exec.c 2007-01-10 21:42:43.000000000 -0800
> @@ -701,7 +701,7 @@ static int de_thread(struct task_struct
> */
> detach_pid(tsk, PIDTYPE_PID);
> tsk->pid = leader->pid;
> - attach_pid(tsk, PIDTYPE_PID, tsk->pid);
> + find_attach_pid(tsk, PIDTYPE_PID, tsk->pid);
> transfer_pid(leader, tsk, PIDTYPE_PGID);
> transfer_pid(leader, tsk, PIDTYPE_SID);
> list_replace_rcu(&leader->tasks, &tsk->tasks);
> Index: lx26-20-rc2-mm1/include/linux/pid.h
> ===================================================================
> --- lx26-20-rc2-mm1.orig/include/linux/pid.h 2007-01-10 14:16:18.000000000 -0800
> +++ lx26-20-rc2-mm1/include/linux/pid.h 2007-01-11 04:44:06.674046656 -0800
> @@ -72,10 +72,10 @@ extern struct task_struct *FASTCALL(get_
> extern struct pid *get_task_pid(struct task_struct *task, enum pid_type type);
>
> /*
> - * attach_pid() and detach_pid() must be called with the tasklist_lock
> + * find_attach_pid() and detach_pid() must be called with the tasklist_lock
> * write-held.
> */
> -extern int FASTCALL(attach_pid(struct task_struct *task,
> +extern int FASTCALL(find_attach_pid(struct task_struct *task,
> enum pid_type type, int nr));
>
> extern void FASTCALL(detach_pid(struct task_struct *task, enum pid_type));
> Index: lx26-20-rc2-mm1/kernel/exit.c
> ===================================================================
> --- lx26-20-rc2-mm1.orig/kernel/exit.c 2007-01-10 14:16:18.000000000 -0800
> +++ lx26-20-rc2-mm1/kernel/exit.c 2007-01-10 21:43:09.000000000 -0800
> @@ -301,12 +301,12 @@ void __set_special_pids(pid_t session, p
> if (process_session(curr) != session) {
> detach_pid(curr, PIDTYPE_SID);
> set_signal_session(curr->signal, session);
> - attach_pid(curr, PIDTYPE_SID, session);
> + find_attach_pid(curr, PIDTYPE_SID, session);
> }
> if (process_group(curr) != pgrp) {
> detach_pid(curr, PIDTYPE_PGID);
> curr->signal->pgrp = pgrp;
> - attach_pid(curr, PIDTYPE_PGID, pgrp);
> + find_attach_pid(curr, PIDTYPE_PGID, pgrp);
> }
> }
>
> Index: lx26-20-rc2-mm1/kernel/fork.c
> ===================================================================
> --- lx26-20-rc2-mm1.orig/kernel/fork.c 2007-01-10 14:16:18.000000000 -0800
> +++ lx26-20-rc2-mm1/kernel/fork.c 2007-01-11 04:43:33.602074360 -0800
> @@ -1248,13 +1248,13 @@ static struct task_struct *copy_process(
> p->signal->tty = current->signal->tty;
> p->signal->pgrp = process_group(current);
> set_signal_session(p->signal, process_session(current));
> - attach_pid(p, PIDTYPE_PGID, process_group(p));
> - attach_pid(p, PIDTYPE_SID, process_session(p));
> + find_attach_pid(p, PIDTYPE_PGID, process_group(p));
> + find_attach_pid(p, PIDTYPE_SID, process_session(p));
>
> list_add_tail_rcu(&p->tasks, &init_task.tasks);
> __get_cpu_var(process_counts)++;
> }
> - attach_pid(p, PIDTYPE_PID, p->pid);
> + find_attach_pid(p, PIDTYPE_PID, p->pid);
> nr_threads++;
> }
>
> Index: lx26-20-rc2-mm1/kernel/pid.c
> ===================================================================
> --- lx26-20-rc2-mm1.orig/kernel/pid.c 2007-01-10 14:15:49.000000000 -0800
> +++ lx26-20-rc2-mm1/kernel/pid.c 2007-01-11 04:44:06.674046656 -0800
> @@ -247,7 +247,8 @@ struct pid * fastcall find_pid(int nr)
> }
> EXPORT_SYMBOL_GPL(find_pid);
>
> -int fastcall attach_pid(struct task_struct *task, enum pid_type type, int nr)
> +int fastcall find_attach_pid(struct task_struct *task, enum pid_type type,
> + int nr)
> {
> struct pid_link *link;
> struct pid *pid;
> Index: lx26-20-rc2-mm1/kernel/sys.c
> ===================================================================
> --- lx26-20-rc2-mm1.orig/kernel/sys.c 2007-01-10 14:16:18.000000000 -0800
> +++ lx26-20-rc2-mm1/kernel/sys.c 2007-01-10 21:45:01.000000000 -0800
> @@ -1480,7 +1480,7 @@ asmlinkage long sys_setpgid(pid_t pid, p
> if (process_group(p) != pgid) {
> detach_pid(p, PIDTYPE_PGID);
> p->signal->pgrp = pgid;
> - attach_pid(p, PIDTYPE_PGID, pgid);
> + find_attach_pid(p, PIDTYPE_PGID, pgid);
> }
>
> err = 0;
