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hrtimers: Prepare hrtimer_nanosleep() for time namespaces

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clock_nanosleep() accepts absolute values of expiration time when
TIMER_ABSTIME flag is set. This absolute value is inside the task's
time namespace, and has to be converted to the host's time.

There is timens_ktime_to_host() helper for converting time, but
it accepts ktime argument.

As a preparation, make hrtimer_nanosleep() accept a clock value in ktime
instead of timespec64.

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-17-dima@arista.com
This commit is contained in:
Andrei Vagin 2019-11-12 01:27:05 +00:00 committed by Thomas Gleixner
parent 0b9b9a3b16
commit ea2d1f7fce
5 changed files with 17 additions and 12 deletions
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3
include/linux/hrtimer.h
View File

@ -508,8 +508,7 @@ static inline u64 hrtimer_forward_now(struct hrtimer *timer,
/* Precise sleep: */
extern int nanosleep_copyout(struct restart_block *, struct timespec64 *);
extern long hrtimer_nanosleep(const struct timespec64 *rqtp,
const enum hrtimer_mode mode,
extern long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode,
const clockid_t clockid);
extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta,

12
kernel/time/hrtimer.c
View File

@ -1910,8 +1910,8 @@ static long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
return ret;
}
long hrtimer_nanosleep(const struct timespec64 *rqtp,
const enum hrtimer_mode mode, const clockid_t clockid)
long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode,
const clockid_t clockid)
{
struct restart_block *restart;
struct hrtimer_sleeper t;
@ -1923,7 +1923,7 @@ long hrtimer_nanosleep(const struct timespec64 *rqtp,
slack = 0;
hrtimer_init_sleeper_on_stack(&t, clockid, mode);
hrtimer_set_expires_range_ns(&t.timer, timespec64_to_ktime(*rqtp), slack);
hrtimer_set_expires_range_ns(&t.timer, rqtp, slack);
ret = do_nanosleep(&t, mode);
if (ret != -ERESTART_RESTARTBLOCK)
goto out;
@ -1958,7 +1958,8 @@ SYSCALL_DEFINE2(nanosleep, struct __kernel_timespec __user *, rqtp,
current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
current->restart_block.nanosleep.rmtp = rmtp;
return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
return hrtimer_nanosleep(timespec64_to_ktime(tu), HRTIMER_MODE_REL,
CLOCK_MONOTONIC);
}
#endif
@ -1978,7 +1979,8 @@ SYSCALL_DEFINE2(nanosleep_time32, struct old_timespec32 __user *, rqtp,
current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
current->restart_block.nanosleep.compat_rmtp = rmtp;
return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
return hrtimer_nanosleep(timespec64_to_ktime(tu), HRTIMER_MODE_REL,
CLOCK_MONOTONIC);
}
#endif

4
kernel/time/posix-stubs.c
View File

@ -147,7 +147,7 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
rmtp = NULL;
current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
current->restart_block.nanosleep.rmtp = rmtp;
return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
return hrtimer_nanosleep(timespec64_to_ktime(t), flags & TIMER_ABSTIME ?
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
which_clock);
}
@ -236,7 +236,7 @@ SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags,
rmtp = NULL;
current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
current->restart_block.nanosleep.compat_rmtp = rmtp;
return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
return hrtimer_nanosleep(timespec64_to_ktime(t), flags & TIMER_ABSTIME ?
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
which_clock);
}

4
kernel/time/posix-timers.c
View File

@ -1221,7 +1221,9 @@ SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock,
static int common_nsleep(const clockid_t which_clock, int flags,
const struct timespec64 *rqtp)
{
return hrtimer_nanosleep(rqtp, flags & TIMER_ABSTIME ?
ktime_t texp = timespec64_to_ktime(*rqtp);
return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
which_clock);
}

6
tools/perf/examples/bpf/5sec.c
View File

@ -41,9 +41,11 @@
#include <bpf.h>
int probe(hrtimer_nanosleep, rqtp->tv_sec)(void *ctx, int err, long sec)
#define NSEC_PER_SEC 1000000000L
int probe(hrtimer_nanosleep, rqtp)(void *ctx, int err, long long sec)
{
return sec == 5;
return sec / NSEC_PER_SEC == 5ULL;
}
license(GPL);