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authorOleg Nesterov <oleg@tv-sign.ru>2008-12-01 14:18:13 -0800
committerIngo Molnar <mingo@elte.hu>2008-12-12 17:00:07 +0100
commit27af4245b6ce99e08c6a7c38825383bf51119cc9 (patch)
tree07ab6b1da26b4d170ccaa700b2207ec1b1aff0db
parent6c34bc2976b30dc8b56392c020e25bae1f363cab (diff)
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posix-timers: use "struct pid*" instead of "struct task_struct*"
Impact: restructure, clean up code k_itimer holds the ref to the ->it_process until sys_timer_delete(). This allows to pin up to RLIMIT_SIGPENDING dead task_struct's. Change the code to use "struct pid *" instead. The patch doesn't kill ->it_process, it places ->it_pid into the union. ->it_process is still used by do_cpu_nanosleep() as before. It would be trivial to change the nanosleep code as well, but since it uses it_process in a special way I think it is better to keep this field for grep. The patch bloats the kernel by 104 bytes and it also adds the new pointer, ->it_signal, to k_itimer. It is used by lock_timer() to verify that the found timer was not created by another process. It is not clear why do we use the global database (and thus the global idr_lock) for posix timers. We still need the signal_struct->posix_timers which contains all useable timers, perhaps it is better to use some form of per-process array instead. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--include/linux/posix-timers.h6
-rw-r--r--kernel/posix-timers.c43
2 files changed, 28 insertions, 21 deletions
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index a7c721355549..4f71bf4e628c 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -45,7 +45,11 @@ struct k_itimer {
int it_requeue_pending; /* waiting to requeue this timer */
#define REQUEUE_PENDING 1
int it_sigev_notify; /* notify word of sigevent struct */
- struct task_struct *it_process; /* process to send signal to */
+ struct signal_struct *it_signal;
+ union {
+ struct pid *it_pid; /* pid of process to send signal to */
+ struct task_struct *it_process; /* for clock_nanosleep */
+ };
struct sigqueue *sigq; /* signal queue entry. */
union {
struct {
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 5e79c662294b..42a39afd694a 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -116,7 +116,7 @@ static DEFINE_SPINLOCK(idr_lock);
* must supply functions here, even if the function just returns
* ENOSYS. The standard POSIX timer management code assumes the
* following: 1.) The k_itimer struct (sched.h) is used for the
- * timer. 2.) The list, it_lock, it_clock, it_id and it_process
+ * timer. 2.) The list, it_lock, it_clock, it_id and it_pid
* fields are not modified by timer code.
*
* At this time all functions EXCEPT clock_nanosleep can be
@@ -313,7 +313,8 @@ void do_schedule_next_timer(struct siginfo *info)
int posix_timer_event(struct k_itimer *timr, int si_private)
{
- int shared, ret;
+ struct task_struct *task;
+ int shared, ret = -1;
/*
* FIXME: if ->sigq is queued we can race with
* dequeue_signal()->do_schedule_next_timer().
@@ -327,8 +328,13 @@ int posix_timer_event(struct k_itimer *timr, int si_private)
*/
timr->sigq->info.si_sys_private = si_private;
- shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
- ret = send_sigqueue(timr->sigq, timr->it_process, shared);
+ rcu_read_lock();
+ task = pid_task(timr->it_pid, PIDTYPE_PID);
+ if (task) {
+ shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
+ ret = send_sigqueue(timr->sigq, task, shared);
+ }
+ rcu_read_unlock();
/* If we failed to send the signal the timer stops. */
return ret > 0;
}
@@ -405,7 +411,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
return ret;
}
-static struct task_struct * good_sigevent(sigevent_t * event)
+static struct pid *good_sigevent(sigevent_t * event)
{
struct task_struct *rtn = current->group_leader;
@@ -419,7 +425,7 @@ static struct task_struct * good_sigevent(sigevent_t * event)
((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
return NULL;
- return rtn;
+ return task_pid(rtn);
}
void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock)
@@ -471,7 +477,7 @@ sys_timer_create(const clockid_t which_clock,
{
struct k_itimer *new_timer;
int error, new_timer_id;
- struct task_struct *process;
+ struct pid *it_pid;
sigevent_t event;
int it_id_set = IT_ID_NOT_SET;
@@ -525,11 +531,9 @@ sys_timer_create(const clockid_t which_clock,
goto out;
}
rcu_read_lock();
- process = good_sigevent(&event);
- if (process)
- get_task_struct(process);
+ it_pid = get_pid(good_sigevent(&event));
rcu_read_unlock();
- if (!process) {
+ if (!it_pid) {
error = -EINVAL;
goto out;
}
@@ -537,8 +541,7 @@ sys_timer_create(const clockid_t which_clock,
event.sigev_notify = SIGEV_SIGNAL;
event.sigev_signo = SIGALRM;
event.sigev_value.sival_int = new_timer->it_id;
- process = current->group_leader;
- get_task_struct(process);
+ it_pid = get_pid(task_tgid(current));
}
new_timer->it_sigev_notify = event.sigev_notify;
@@ -548,7 +551,8 @@ sys_timer_create(const clockid_t which_clock,
new_timer->sigq->info.si_code = SI_TIMER;
spin_lock_irq(&current->sighand->siglock);
- new_timer->it_process = process;
+ new_timer->it_pid = it_pid;
+ new_timer->it_signal = current->signal;
list_add(&new_timer->list, &current->signal->posix_timers);
spin_unlock_irq(&current->sighand->siglock);
@@ -583,8 +587,7 @@ static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags)
timr = idr_find(&posix_timers_id, (int)timer_id);
if (timr) {
spin_lock(&timr->it_lock);
- if (timr->it_process &&
- same_thread_group(timr->it_process, current)) {
+ if (timr->it_pid && timr->it_signal == current->signal) {
spin_unlock(&idr_lock);
return timr;
}
@@ -831,8 +834,8 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- put_task_struct(timer->it_process);
- timer->it_process = NULL;
+ put_pid(timer->it_pid);
+ timer->it_pid = NULL;
unlock_timer(timer, flags);
release_posix_timer(timer, IT_ID_SET);
@@ -858,8 +861,8 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- put_task_struct(timer->it_process);
- timer->it_process = NULL;
+ put_pid(timer->it_pid);
+ timer->it_pid = NULL;
unlock_timer(timer, flags);
release_posix_timer(timer, IT_ID_SET);