Messages in this thread Patch in this message | | | Date | Mon, 26 Nov 2007 17:25:55 +0300 | From | Oleg Nesterov <> | Subject | [PATCH 2/3] teach set_special_pids() to use struct pid |
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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(¤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); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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