ktime_t moffs;
wait_queue_head_t wqh;
u64 ticks;
- int expired;
int clockid;
+ short unsigned expired;
+ short unsigned settime_flags; /* to show in fdinfo */
struct rcu_head rcu;
struct list_head clist;
+ spinlock_t cancel_lock;
bool might_cancel;
};
*/
void timerfd_clock_was_set(void)
{
- ktime_t moffs = ktime_get_monotonic_offset();
+ ktime_t moffs = ktime_mono_to_real((ktime_t){ .tv64 = 0 });
struct timerfd_ctx *ctx;
unsigned long flags;
rcu_read_unlock();
}
-static void timerfd_remove_cancel(struct timerfd_ctx *ctx)
+static void __timerfd_remove_cancel(struct timerfd_ctx *ctx)
{
if (ctx->might_cancel) {
ctx->might_cancel = false;
}
}
+static void timerfd_remove_cancel(struct timerfd_ctx *ctx)
+{
+ spin_lock(&ctx->cancel_lock);
+ __timerfd_remove_cancel(ctx);
+ spin_unlock(&ctx->cancel_lock);
+}
+
static bool timerfd_canceled(struct timerfd_ctx *ctx)
{
if (!ctx->might_cancel || ctx->moffs.tv64 != KTIME_MAX)
return false;
- ctx->moffs = ktime_get_monotonic_offset();
+ ctx->moffs = ktime_mono_to_real((ktime_t){ .tv64 = 0 });
return true;
}
static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags)
{
+ spin_lock(&ctx->cancel_lock);
if ((ctx->clockid == CLOCK_REALTIME ||
ctx->clockid == CLOCK_REALTIME_ALARM) &&
(flags & TFD_TIMER_ABSTIME) && (flags & TFD_TIMER_CANCEL_ON_SET)) {
list_add_rcu(&ctx->clist, &cancel_list);
spin_unlock(&cancel_lock);
}
- } else if (ctx->might_cancel) {
- timerfd_remove_cancel(ctx);
+ } else {
+ __timerfd_remove_cancel(ctx);
}
+ spin_unlock(&ctx->cancel_lock);
}
static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx)
if (isalarm(ctx))
remaining = alarm_expires_remaining(&ctx->t.alarm);
else
- remaining = hrtimer_expires_remaining(&ctx->t.tmr);
+ remaining = hrtimer_expires_remaining_adjusted(&ctx->t.tmr);
return remaining.tv64 < 0 ? ktime_set(0, 0): remaining;
}
if (timerfd_canceled(ctx))
return -ECANCELED;
}
+
+ ctx->settime_flags = flags & TFD_SETTIME_FLAGS;
return 0;
}
return res;
}
+#ifdef CONFIG_PROC_FS
+static void timerfd_show(struct seq_file *m, struct file *file)
+{
+ struct timerfd_ctx *ctx = file->private_data;
+ struct itimerspec t;
+
+ spin_lock_irq(&ctx->wqh.lock);
+ t.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
+ t.it_interval = ktime_to_timespec(ctx->tintv);
+ spin_unlock_irq(&ctx->wqh.lock);
+
+ seq_printf(m,
+ "clockid: %d\n"
+ "ticks: %llu\n"
+ "settime flags: 0%o\n"
+ "it_value: (%llu, %llu)\n"
+ "it_interval: (%llu, %llu)\n",
+ ctx->clockid,
+ (unsigned long long)ctx->ticks,
+ ctx->settime_flags,
+ (unsigned long long)t.it_value.tv_sec,
+ (unsigned long long)t.it_value.tv_nsec,
+ (unsigned long long)t.it_interval.tv_sec,
+ (unsigned long long)t.it_interval.tv_nsec);
+}
+#else
+#define timerfd_show NULL
+#endif
+
+#ifdef CONFIG_CHECKPOINT_RESTORE
+static long timerfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct timerfd_ctx *ctx = file->private_data;
+ int ret = 0;
+
+ switch (cmd) {
+ case TFD_IOC_SET_TICKS: {
+ u64 ticks;
+
+ if (copy_from_user(&ticks, (u64 __user *)arg, sizeof(ticks)))
+ return -EFAULT;
+ if (!ticks)
+ return -EINVAL;
+
+ spin_lock_irq(&ctx->wqh.lock);
+ if (!timerfd_canceled(ctx)) {
+ ctx->ticks = ticks;
+ wake_up_locked(&ctx->wqh);
+ } else
+ ret = -ECANCELED;
+ spin_unlock_irq(&ctx->wqh.lock);
+ break;
+ }
+ default:
+ ret = -ENOTTY;
+ break;
+ }
+
+ return ret;
+}
+#else
+#define timerfd_ioctl NULL
+#endif
+
static const struct file_operations timerfd_fops = {
.release = timerfd_release,
.poll = timerfd_poll,
.read = timerfd_read,
.llseek = noop_llseek,
+ .show_fdinfo = timerfd_show,
+ .unlocked_ioctl = timerfd_ioctl,
};
static int timerfd_fget(int fd, struct fd *p)
return -ENOMEM;
init_waitqueue_head(&ctx->wqh);
+ spin_lock_init(&ctx->cancel_lock);
ctx->clockid = clockid;
if (isalarm(ctx))
else
hrtimer_init(&ctx->t.tmr, clockid, HRTIMER_MODE_ABS);
- ctx->moffs = ktime_get_monotonic_offset();
+ ctx->moffs = ktime_mono_to_real((ktime_t){ .tv64 = 0 });
ufd = anon_inode_getfd("[timerfd]", &timerfd_fops, ctx,
O_RDWR | (flags & TFD_SHARED_FCNTL_FLAGS));