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bcachefs: Convert clock code to u64s

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Eliminate possible integer truncation bugs on 32 bit

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-29 18:08:20 -04:00
parent ec8bf491a9
commit 27d033df35
3 changed files with 35 additions and 42 deletions
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65
fs/bcachefs/clock.c
View File

@ -15,18 +15,15 @@ static inline long io_timer_cmp(io_timer_heap *h,
void bch2_io_timer_add(struct io_clock *clock, struct io_timer *timer)
{
size_t i;
spin_lock(&clock->timer_lock);
if (time_after_eq((unsigned long) atomic64_read(&clock->now),
timer->expire)) {
if (time_after_eq64((u64) atomic64_read(&clock->now), timer->expire)) {
spin_unlock(&clock->timer_lock);
timer->fn(timer);
return;
}
for (i = 0; i < clock->timers.used; i++)
for (size_t i = 0; i < clock->timers.used; i++)
if (clock->timers.data[i] == timer)
goto out;
@ -37,11 +34,9 @@ out:
void bch2_io_timer_del(struct io_clock *clock, struct io_timer *timer)
{
size_t i;
spin_lock(&clock->timer_lock);
for (i = 0; i < clock->timers.used; i++)
for (size_t i = 0; i < clock->timers.used; i++)
if (clock->timers.data[i] == timer) {
heap_del(&clock->timers, i, io_timer_cmp, NULL);
break;
@ -75,33 +70,31 @@ static void io_clock_cpu_timeout(struct timer_list *timer)
wake_up_process(wait->task);
}
void bch2_io_clock_schedule_timeout(struct io_clock *clock, unsigned long until)
void bch2_io_clock_schedule_timeout(struct io_clock *clock, u64 until)
{
struct io_clock_wait wait;
struct io_clock_wait wait = {
.io_timer.expire = until,
.io_timer.fn = io_clock_wait_fn,
.io_timer.fn2 = (void *) _RET_IP_,
.task = current,
};
/* XXX: calculate sleep time rigorously */
wait.io_timer.expire = until;
wait.io_timer.fn = io_clock_wait_fn;
wait.task = current;
wait.expired = 0;
bch2_io_timer_add(clock, &wait.io_timer);
schedule();
bch2_io_timer_del(clock, &wait.io_timer);
}
void bch2_kthread_io_clock_wait(struct io_clock *clock,
unsigned long io_until,
unsigned long cpu_timeout)
u64 io_until, unsigned long cpu_timeout)
{
bool kthread = (current->flags & PF_KTHREAD) != 0;
struct io_clock_wait wait;
struct io_clock_wait wait = {
.io_timer.expire = io_until,
.io_timer.fn = io_clock_wait_fn,
.io_timer.fn2 = (void *) _RET_IP_,
.task = current,
};
wait.io_timer.expire = io_until;
wait.io_timer.fn = io_clock_wait_fn;
wait.task = current;
wait.expired = 0;
bch2_io_timer_add(clock, &wait.io_timer);
timer_setup_on_stack(&wait.cpu_timer, io_clock_cpu_timeout, 0);
@ -127,21 +120,20 @@ void bch2_kthread_io_clock_wait(struct io_clock *clock,
bch2_io_timer_del(clock, &wait.io_timer);
}
static struct io_timer *get_expired_timer(struct io_clock *clock,
unsigned long now)
static struct io_timer *get_expired_timer(struct io_clock *clock, u64 now)
{
struct io_timer *ret = NULL;
if (clock->timers.used &&
time_after_eq(now, clock->timers.data[0]->expire))
time_after_eq64(now, clock->timers.data[0]->expire))
heap_pop(&clock->timers, ret, io_timer_cmp, NULL);
return ret;
}
void __bch2_increment_clock(struct io_clock *clock, unsigned sectors)
void __bch2_increment_clock(struct io_clock *clock, u64 sectors)
{
struct io_timer *timer;
unsigned long now = atomic64_add_return(sectors, &clock->now);
u64 now = atomic64_add_return(sectors, &clock->now);
spin_lock(&clock->timer_lock);
while ((timer = get_expired_timer(clock, now)))
@ -151,17 +143,18 @@ void __bch2_increment_clock(struct io_clock *clock, unsigned sectors)
void bch2_io_timers_to_text(struct printbuf *out, struct io_clock *clock)
{
unsigned long now;
unsigned i;
out->atomic++;
spin_lock(&clock->timer_lock);
now = atomic64_read(&clock->now);
u64 now = atomic64_read(&clock->now);
for (i = 0; i < clock->timers.used; i++)
prt_printf(out, "%ps:\t%li\n",
printbuf_tabstop_push(out, 40);
prt_printf(out, "current time:\t%llu\n", now);
for (unsigned i = 0; i < clock->timers.used; i++)
prt_printf(out, "%ps %ps:\t%llu\n",
clock->timers.data[i]->fn,
clock->timers.data[i]->expire - now);
clock->timers.data[i]->fn2,
clock->timers.data[i]->expire);
spin_unlock(&clock->timer_lock);
--out->atomic;
}

9
fs/bcachefs/clock.h
View File

@ -4,12 +4,11 @@
void bch2_io_timer_add(struct io_clock *, struct io_timer *);
void bch2_io_timer_del(struct io_clock *, struct io_timer *);
void bch2_kthread_io_clock_wait(struct io_clock *, unsigned long,
unsigned long);
void bch2_kthread_io_clock_wait(struct io_clock *, u64, unsigned long);
void __bch2_increment_clock(struct io_clock *, unsigned);
void __bch2_increment_clock(struct io_clock *, u64);
static inline void bch2_increment_clock(struct bch_fs *c, unsigned sectors,
static inline void bch2_increment_clock(struct bch_fs *c, u64 sectors,
int rw)
{
struct io_clock *clock = &c->io_clock[rw];
@ -19,7 +18,7 @@ static inline void bch2_increment_clock(struct bch_fs *c, unsigned sectors,
__bch2_increment_clock(clock, this_cpu_xchg(*clock->pcpu_buf, 0));
}
void bch2_io_clock_schedule_timeout(struct io_clock *, unsigned long);
void bch2_io_clock_schedule_timeout(struct io_clock *, u64);
#define bch2_kthread_wait_event_ioclock_timeout(condition, clock, timeout)\
({ \

3
fs/bcachefs/clock_types.h
View File

@ -17,7 +17,8 @@ typedef void (*io_timer_fn)(struct io_timer *);
struct io_timer {
io_timer_fn fn;
unsigned long expire;
void *fn2;
u64 expire;
};
/* Amount to buffer up on a percpu counter */