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authorOleg Nesterov <oleg@tv-sign.ru>2008-02-08 04:19:09 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:27 -0800
commit8520d7c7f8611216e3b270becec95bb35b6899d4 (patch)
tree77001e6830bb415590067e9d4be24cd8bdd36219
parente4cc0a9c876d4d4eadaef97a2bff4a199946d202 (diff)
downloadop-kernel-dev-8520d7c7f8611216e3b270becec95bb35b6899d4.zip
op-kernel-dev-8520d7c7f8611216e3b270becec95bb35b6899d4.tar.gz
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>
-rw-r--r--include/linux/sched.h2
-rw-r--r--init/main.c2
-rw-r--r--kernel/exit.c30
-rw-r--r--kernel/sys.c2
4 files changed, 18 insertions, 18 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8a4812c..d1c9b7f 100644
--- 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
index 2a78932..9a5b18c 100644
--- 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
index 42a8713..96716fd 100644
--- 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
index e13bc51..c326d6d 100644
--- 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;
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