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fs/timerfd.c
13.6 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * fs/timerfd.c * * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org> * * * Thanks to Thomas Gleixner for code reviews and useful comments. * */ |
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#include <linux/alarmtimer.h> |
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#include <linux/file.h> #include <linux/poll.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/list.h> #include <linux/spinlock.h> #include <linux/time.h> #include <linux/hrtimer.h> #include <linux/anon_inodes.h> #include <linux/timerfd.h> |
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#include <linux/syscalls.h> |
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#include <linux/compat.h> |
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#include <linux/rcupdate.h> |
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#include <linux/time_namespace.h> |
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struct timerfd_ctx { |
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union { struct hrtimer tmr; struct alarm alarm; } t; |
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ktime_t tintv; |
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ktime_t moffs; |
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wait_queue_head_t wqh; |
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u64 ticks; |
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int clockid; |
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short unsigned expired; short unsigned settime_flags; /* to show in fdinfo */ |
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struct rcu_head rcu; struct list_head clist; |
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spinlock_t cancel_lock; |
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bool might_cancel; |
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}; |
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static LIST_HEAD(cancel_list); static DEFINE_SPINLOCK(cancel_lock); |
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static inline bool isalarm(struct timerfd_ctx *ctx) { return ctx->clockid == CLOCK_REALTIME_ALARM || ctx->clockid == CLOCK_BOOTTIME_ALARM; } |
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/* * This gets called when the timer event triggers. We set the "expired" * flag, but we do not re-arm the timer (in case it's necessary, |
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* tintv != 0) until the timer is accessed. |
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*/ |
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static void timerfd_triggered(struct timerfd_ctx *ctx) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&ctx->wqh.lock, flags); |
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ctx->expired = 1; |
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ctx->ticks++; |
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wake_up_locked_poll(&ctx->wqh, EPOLLIN); |
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spin_unlock_irqrestore(&ctx->wqh.lock, flags); |
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} |
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|
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static enum hrtimer_restart timerfd_tmrproc(struct hrtimer *htmr) { struct timerfd_ctx *ctx = container_of(htmr, struct timerfd_ctx, t.tmr); timerfd_triggered(ctx); |
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return HRTIMER_NORESTART; } |
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static enum alarmtimer_restart timerfd_alarmproc(struct alarm *alarm, ktime_t now) { struct timerfd_ctx *ctx = container_of(alarm, struct timerfd_ctx, t.alarm); timerfd_triggered(ctx); return ALARMTIMER_NORESTART; } |
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/* * Called when the clock was set to cancel the timers in the cancel |
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* list. This will wake up processes waiting on these timers. The * wake-up requires ctx->ticks to be non zero, therefore we increment * it before calling wake_up_locked(). |
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*/ void timerfd_clock_was_set(void) |
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{ |
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ktime_t moffs = ktime_mono_to_real(0); |
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struct timerfd_ctx *ctx; unsigned long flags; |
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|
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rcu_read_lock(); list_for_each_entry_rcu(ctx, &cancel_list, clist) { if (!ctx->might_cancel) continue; spin_lock_irqsave(&ctx->wqh.lock, flags); |
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if (ctx->moffs != moffs) { ctx->moffs = KTIME_MAX; |
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ctx->ticks++; |
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wake_up_locked_poll(&ctx->wqh, EPOLLIN); |
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} spin_unlock_irqrestore(&ctx->wqh.lock, flags); } rcu_read_unlock(); |
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} |
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static void __timerfd_remove_cancel(struct timerfd_ctx *ctx) |
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{ |
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if (ctx->might_cancel) { ctx->might_cancel = false; spin_lock(&cancel_lock); list_del_rcu(&ctx->clist); spin_unlock(&cancel_lock); } } |
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|
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static void timerfd_remove_cancel(struct timerfd_ctx *ctx) { spin_lock(&ctx->cancel_lock); __timerfd_remove_cancel(ctx); spin_unlock(&ctx->cancel_lock); } |
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static bool timerfd_canceled(struct timerfd_ctx *ctx) { |
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if (!ctx->might_cancel || ctx->moffs != KTIME_MAX) |
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return false; |
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ctx->moffs = ktime_mono_to_real(0); |
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return true; } |
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|
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static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags) { |
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spin_lock(&ctx->cancel_lock); |
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if ((ctx->clockid == CLOCK_REALTIME || ctx->clockid == CLOCK_REALTIME_ALARM) && (flags & TFD_TIMER_ABSTIME) && (flags & TFD_TIMER_CANCEL_ON_SET)) { |
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if (!ctx->might_cancel) { ctx->might_cancel = true; spin_lock(&cancel_lock); list_add_rcu(&ctx->clist, &cancel_list); spin_unlock(&cancel_lock); } |
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} else { __timerfd_remove_cancel(ctx); |
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} |
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spin_unlock(&ctx->cancel_lock); |
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} |
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|
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static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx) { ktime_t remaining; |
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|
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if (isalarm(ctx)) remaining = alarm_expires_remaining(&ctx->t.alarm); else |
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remaining = hrtimer_expires_remaining_adjusted(&ctx->t.tmr); |
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|
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return remaining < 0 ? 0: remaining; |
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} static int timerfd_setup(struct timerfd_ctx *ctx, int flags, |
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const struct itimerspec64 *ktmr) |
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{ enum hrtimer_mode htmode; ktime_t texp; |
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int clockid = ctx->clockid; |
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htmode = (flags & TFD_TIMER_ABSTIME) ? HRTIMER_MODE_ABS: HRTIMER_MODE_REL; |
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texp = timespec64_to_ktime(ktmr->it_value); |
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ctx->expired = 0; |
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ctx->ticks = 0; |
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ctx->tintv = timespec64_to_ktime(ktmr->it_interval); |
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if (isalarm(ctx)) { alarm_init(&ctx->t.alarm, ctx->clockid == CLOCK_REALTIME_ALARM ? ALARM_REALTIME : ALARM_BOOTTIME, timerfd_alarmproc); } else { hrtimer_init(&ctx->t.tmr, clockid, htmode); hrtimer_set_expires(&ctx->t.tmr, texp); ctx->t.tmr.function = timerfd_tmrproc; } |
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if (texp != 0) { |
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if (flags & TFD_TIMER_ABSTIME) texp = timens_ktime_to_host(clockid, texp); |
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if (isalarm(ctx)) { if (flags & TFD_TIMER_ABSTIME) alarm_start(&ctx->t.alarm, texp); else alarm_start_relative(&ctx->t.alarm, texp); } else { hrtimer_start(&ctx->t.tmr, texp, htmode); } |
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if (timerfd_canceled(ctx)) return -ECANCELED; } |
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ctx->settime_flags = flags & TFD_SETTIME_FLAGS; |
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return 0; |
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} static int timerfd_release(struct inode *inode, struct file *file) { struct timerfd_ctx *ctx = file->private_data; |
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timerfd_remove_cancel(ctx); |
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if (isalarm(ctx)) alarm_cancel(&ctx->t.alarm); else hrtimer_cancel(&ctx->t.tmr); |
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kfree_rcu(ctx, rcu); |
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return 0; } |
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static __poll_t timerfd_poll(struct file *file, poll_table *wait) |
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{ struct timerfd_ctx *ctx = file->private_data; |
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__poll_t events = 0; unsigned long flags; |
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|
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poll_wait(file, &ctx->wqh, wait); |
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|
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spin_lock_irqsave(&ctx->wqh.lock, flags); if (ctx->ticks) events |= EPOLLIN; spin_unlock_irqrestore(&ctx->wqh.lock, flags); |
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|
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return events; |
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} static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct timerfd_ctx *ctx = file->private_data; ssize_t res; |
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u64 ticks = 0; |
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if (count < sizeof(ticks)) return -EINVAL; |
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spin_lock_irq(&ctx->wqh.lock); |
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if (file->f_flags & O_NONBLOCK) res = -EAGAIN; else res = wait_event_interruptible_locked_irq(ctx->wqh, ctx->ticks); |
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|
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/* * If clock has changed, we do not care about the * ticks and we do not rearm the timer. Userspace must * reevaluate anyway. */ if (timerfd_canceled(ctx)) { ctx->ticks = 0; ctx->expired = 0; res = -ECANCELED; } |
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if (ctx->ticks) { ticks = ctx->ticks; |
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|
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if (ctx->expired && ctx->tintv) { |
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/* |
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* If tintv != 0, this is a periodic timer that |
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* needs to be re-armed. We avoid doing it in the timer * callback to avoid DoS attacks specifying a very * short timer period. */ |
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if (isalarm(ctx)) { ticks += alarm_forward_now( &ctx->t.alarm, ctx->tintv) - 1; alarm_restart(&ctx->t.alarm); } else { ticks += hrtimer_forward_now(&ctx->t.tmr, ctx->tintv) - 1; hrtimer_restart(&ctx->t.tmr); } |
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} ctx->expired = 0; ctx->ticks = 0; |
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} |
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spin_unlock_irq(&ctx->wqh.lock); |
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if (ticks) |
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res = put_user(ticks, (u64 __user *) buf) ? -EFAULT: sizeof(ticks); |
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return res; } |
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#ifdef CONFIG_PROC_FS |
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static void timerfd_show(struct seq_file *m, struct file *file) |
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{ struct timerfd_ctx *ctx = file->private_data; |
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struct timespec64 value, interval; |
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spin_lock_irq(&ctx->wqh.lock); |
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value = ktime_to_timespec64(timerfd_get_remaining(ctx)); interval = ktime_to_timespec64(ctx->tintv); |
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spin_unlock_irq(&ctx->wqh.lock); |
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seq_printf(m, "clockid: %d " "ticks: %llu " "settime flags: 0%o " "it_value: (%llu, %llu) " "it_interval: (%llu, %llu) ", ctx->clockid, (unsigned long long)ctx->ticks, ctx->settime_flags, |
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(unsigned long long)value.tv_sec, (unsigned long long)value.tv_nsec, (unsigned long long)interval.tv_sec, (unsigned long long)interval.tv_nsec); |
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} #else #define timerfd_show NULL #endif |
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#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; |
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wake_up_locked_poll(&ctx->wqh, EPOLLIN); |
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} else ret = -ECANCELED; spin_unlock_irq(&ctx->wqh.lock); break; } default: ret = -ENOTTY; break; } return ret; } #else #define timerfd_ioctl NULL #endif |
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static const struct file_operations timerfd_fops = { .release = timerfd_release, |
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.poll = timerfd_poll, |
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.read = timerfd_read, |
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.llseek = noop_llseek, |
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.show_fdinfo = timerfd_show, |
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.unlocked_ioctl = timerfd_ioctl, |
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}; |
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static int timerfd_fget(int fd, struct fd *p) |
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{ |
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struct fd f = fdget(fd); if (!f.file) return -EBADF; if (f.file->f_op != &timerfd_fops) { fdput(f); return -EINVAL; |
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} |
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*p = f; return 0; |
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} |
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SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags) |
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{ |
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int ufd; |
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struct timerfd_ctx *ctx; |
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|
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/* Check the TFD_* constants for consistency. */ BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC); BUILD_BUG_ON(TFD_NONBLOCK != O_NONBLOCK); |
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if ((flags & ~TFD_CREATE_FLAGS) || (clockid != CLOCK_MONOTONIC && |
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clockid != CLOCK_REALTIME && clockid != CLOCK_REALTIME_ALARM && |
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clockid != CLOCK_BOOTTIME && |
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clockid != CLOCK_BOOTTIME_ALARM)) |
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return -EINVAL; |
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|
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if ((clockid == CLOCK_REALTIME_ALARM || clockid == CLOCK_BOOTTIME_ALARM) && !capable(CAP_WAKE_ALARM)) |
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return -EPERM; |
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; init_waitqueue_head(&ctx->wqh); |
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spin_lock_init(&ctx->cancel_lock); |
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ctx->clockid = clockid; |
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if (isalarm(ctx)) alarm_init(&ctx->t.alarm, ctx->clockid == CLOCK_REALTIME_ALARM ? ALARM_REALTIME : ALARM_BOOTTIME, timerfd_alarmproc); else hrtimer_init(&ctx->t.tmr, clockid, HRTIMER_MODE_ABS); |
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ctx->moffs = ktime_mono_to_real(0); |
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|
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ufd = anon_inode_getfd("[timerfd]", &timerfd_fops, ctx, |
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O_RDWR | (flags & TFD_SHARED_FCNTL_FLAGS)); |
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if (ufd < 0) |
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kfree(ctx); |
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return ufd; } |
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static int do_timerfd_settime(int ufd, int flags, |
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const struct itimerspec64 *new, struct itimerspec64 *old) |
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{ |
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struct fd f; |
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struct timerfd_ctx *ctx; |
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int ret; |
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|
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if ((flags & ~TFD_SETTIME_FLAGS) || |
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!itimerspec64_valid(new)) |
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return -EINVAL; |
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ret = timerfd_fget(ufd, &f); if (ret) return ret; ctx = f.file->private_data; |
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|
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if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) { |
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fdput(f); return -EPERM; } |
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timerfd_setup_cancel(ctx, flags); |
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/* * We need to stop the existing timer before reprogramming * it to the new values. */ for (;;) { spin_lock_irq(&ctx->wqh.lock); |
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446 447 448 449 450 451 452 453 |
if (isalarm(ctx)) { if (alarm_try_to_cancel(&ctx->t.alarm) >= 0) break; } else { if (hrtimer_try_to_cancel(&ctx->t.tmr) >= 0) break; } |
18963c01b timerfd use waitq... |
454 |
spin_unlock_irq(&ctx->wqh.lock); |
a125ecc16 timerfd: Prepare ... |
455 456 457 458 459 |
if (isalarm(ctx)) hrtimer_cancel_wait_running(&ctx->t.alarm.timer); else hrtimer_cancel_wait_running(&ctx->t.tmr); |
b215e2839 signal/timer/even... |
460 |
} |
4d672e7ac timerfd: new time... |
461 462 463 464 465 466 |
/* * If the timer is expired and it's periodic, we need to advance it * because the caller may want to know the previous expiration time. * We do not update "ticks" and "expired" since the timer will be * re-programmed again in the following timerfd_setup() call. */ |
2456e8553 ktime: Get rid of... |
467 |
if (ctx->expired && ctx->tintv) { |
11ffa9d60 timerfd: Add alar... |
468 469 470 471 472 |
if (isalarm(ctx)) alarm_forward_now(&ctx->t.alarm, ctx->tintv); else hrtimer_forward_now(&ctx->t.tmr, ctx->tintv); } |
b215e2839 signal/timer/even... |
473 |
|
bff412036 timerfd: Use get_... |
474 475 |
old->it_value = ktime_to_timespec64(timerfd_get_remaining(ctx)); old->it_interval = ktime_to_timespec64(ctx->tintv); |
4d672e7ac timerfd: new time... |
476 477 478 479 |
/* * Re-program the timer to the new value ... */ |
9d94b9e2f switch timerfd co... |
480 |
ret = timerfd_setup(ctx, flags, new); |
4d672e7ac timerfd: new time... |
481 482 |
spin_unlock_irq(&ctx->wqh.lock); |
2903ff019 switch simple cas... |
483 |
fdput(f); |
99ee5315d timerfd: Allow ti... |
484 |
return ret; |
4d672e7ac timerfd: new time... |
485 |
} |
bff412036 timerfd: Use get_... |
486 |
static int do_timerfd_gettime(int ufd, struct itimerspec64 *t) |
4d672e7ac timerfd: new time... |
487 |
{ |
2903ff019 switch simple cas... |
488 |
struct fd f; |
4d672e7ac timerfd: new time... |
489 |
struct timerfd_ctx *ctx; |
2903ff019 switch simple cas... |
490 491 492 493 |
int ret = timerfd_fget(ufd, &f); if (ret) return ret; ctx = f.file->private_data; |
4d672e7ac timerfd: new time... |
494 495 |
spin_lock_irq(&ctx->wqh.lock); |
2456e8553 ktime: Get rid of... |
496 |
if (ctx->expired && ctx->tintv) { |
4d672e7ac timerfd: new time... |
497 |
ctx->expired = 0; |
11ffa9d60 timerfd: Add alar... |
498 499 500 501 502 503 504 505 506 507 508 509 |
if (isalarm(ctx)) { ctx->ticks += alarm_forward_now( &ctx->t.alarm, ctx->tintv) - 1; alarm_restart(&ctx->t.alarm); } else { ctx->ticks += hrtimer_forward_now(&ctx->t.tmr, ctx->tintv) - 1; hrtimer_restart(&ctx->t.tmr); } |
4d672e7ac timerfd: new time... |
510 |
} |
bff412036 timerfd: Use get_... |
511 512 |
t->it_value = ktime_to_timespec64(timerfd_get_remaining(ctx)); t->it_interval = ktime_to_timespec64(ctx->tintv); |
4d672e7ac timerfd: new time... |
513 |
spin_unlock_irq(&ctx->wqh.lock); |
2903ff019 switch simple cas... |
514 |
fdput(f); |
9d94b9e2f switch timerfd co... |
515 516 517 518 |
return 0; } SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags, |
6ff847350 time: Change type... |
519 520 |
const struct __kernel_itimerspec __user *, utmr, struct __kernel_itimerspec __user *, otmr) |
9d94b9e2f switch timerfd co... |
521 |
{ |
bff412036 timerfd: Use get_... |
522 |
struct itimerspec64 new, old; |
9d94b9e2f switch timerfd co... |
523 |
int ret; |
bff412036 timerfd: Use get_... |
524 |
if (get_itimerspec64(&new, utmr)) |
9d94b9e2f switch timerfd co... |
525 526 527 528 |
return -EFAULT; ret = do_timerfd_settime(ufd, flags, &new, &old); if (ret) return ret; |
bff412036 timerfd: Use get_... |
529 |
if (otmr && put_itimerspec64(&old, otmr)) |
9d94b9e2f switch timerfd co... |
530 531 532 533 |
return -EFAULT; return ret; } |
4d672e7ac timerfd: new time... |
534 |
|
6ff847350 time: Change type... |
535 |
SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct __kernel_itimerspec __user *, otmr) |
9d94b9e2f switch timerfd co... |
536 |
{ |
bff412036 timerfd: Use get_... |
537 |
struct itimerspec64 kotmr; |
9d94b9e2f switch timerfd co... |
538 539 540 |
int ret = do_timerfd_gettime(ufd, &kotmr); if (ret) return ret; |
bff412036 timerfd: Use get_... |
541 |
return put_itimerspec64(&kotmr, otmr) ? -EFAULT : 0; |
b215e2839 signal/timer/even... |
542 |
} |
6ff847350 time: Change type... |
543 |
#ifdef CONFIG_COMPAT_32BIT_TIME |
8dabe7245 y2038: syscalls: ... |
544 |
SYSCALL_DEFINE4(timerfd_settime32, int, ufd, int, flags, |
9afc5eee6 y2038: globally r... |
545 546 |
const struct old_itimerspec32 __user *, utmr, struct old_itimerspec32 __user *, otmr) |
9d94b9e2f switch timerfd co... |
547 |
{ |
bff412036 timerfd: Use get_... |
548 |
struct itimerspec64 new, old; |
9d94b9e2f switch timerfd co... |
549 |
int ret; |
9afc5eee6 y2038: globally r... |
550 |
if (get_old_itimerspec32(&new, utmr)) |
9d94b9e2f switch timerfd co... |
551 552 553 554 |
return -EFAULT; ret = do_timerfd_settime(ufd, flags, &new, &old); if (ret) return ret; |
9afc5eee6 y2038: globally r... |
555 |
if (otmr && put_old_itimerspec32(&old, otmr)) |
9d94b9e2f switch timerfd co... |
556 557 558 |
return -EFAULT; return ret; } |
8dabe7245 y2038: syscalls: ... |
559 |
SYSCALL_DEFINE2(timerfd_gettime32, int, ufd, |
9afc5eee6 y2038: globally r... |
560 |
struct old_itimerspec32 __user *, otmr) |
9d94b9e2f switch timerfd co... |
561 |
{ |
bff412036 timerfd: Use get_... |
562 |
struct itimerspec64 kotmr; |
9d94b9e2f switch timerfd co... |
563 564 565 |
int ret = do_timerfd_gettime(ufd, &kotmr); if (ret) return ret; |
9afc5eee6 y2038: globally r... |
566 |
return put_old_itimerspec32(&kotmr, otmr) ? -EFAULT : 0; |
9d94b9e2f switch timerfd co... |
567 568 |
} #endif |