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posix-clocks: Wire up clock_gettime() with timens offsets

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Adjust monotonic and boottime clocks with per-timens offsets.  As the
result a process inside time namespace will see timers and clocks corrected
to offsets that were set when the namespace was created

Note that applications usually go through vDSO to get time, which is not
yet adjusted. Further changes will complete time namespace virtualisation
with vDSO support.

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-12-dima@arista.com
This commit is contained in:
Andrei Vagin
2019-11-12 01:27:00 +00:00
committed by Thomas Gleixner
parent 198fa445d5
commit 5a590f35ad
3 changed files with 16 additions and 1 deletions
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9
kernel/time/alarmtimer.c
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@@ -26,6 +26,7 @@
#include <linux/freezer.h>
#include <linux/compat.h>
#include <linux/module.h>
#include <linux/time_namespace.h>
#include "posix-timers.h"
@@ -886,6 +887,12 @@ static struct platform_driver alarmtimer_driver = {
}
};
static void get_boottime_timespec(struct timespec64 *tp)
{
ktime_get_boottime_ts64(tp);
timens_add_boottime(tp);
}
/**
* alarmtimer_init - Initialize alarm timer code
*
@@ -906,7 +913,7 @@ static int __init alarmtimer_init(void)
alarm_bases[ALARM_REALTIME].get_timespec = ktime_get_real_ts64,
alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME;
alarm_bases[ALARM_BOOTTIME].get_ktime = &ktime_get_boottime;
alarm_bases[ALARM_BOOTTIME].get_timespec = ktime_get_boottime_ts64;
alarm_bases[ALARM_BOOTTIME].get_timespec = get_boottime_timespec;
for (i = 0; i < ALARM_NUMTYPE; i++) {
timerqueue_init_head(&alarm_bases[i].timerqueue);
spin_lock_init(&alarm_bases[i].lock);