Unverified Commit 31909e33 authored by Michael Weiß's avatar Michael Weiß Committed by Christian Brauner
Browse files

timens: additional helper functions for boottime offset handling 



Provide functions for time_namespace to subtract the boottime offset
from a timespec64 as well as to apply the boottime offset to u64 types in
nanoseconds.

Signed-off-by: default avatarMichael Weiß <michael.weiss@aisec.fraunhofer.de>
Reviewed-by: default avatarAndrei Vagin <avagin@gmail.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarChristian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20201027204258.7869-2-michael.weiss@aisec.fraunhofer.de
parent 3cea11cd

include/linux/time_namespace.h

+22 −0
Original line number Diff line number Diff line
@@ -77,6 +77,20 @@ static inline void timens_add_boottime(struct timespec64 *ts) 
	*ts = timespec64_add(*ts, ns_offsets->boottime);

}



static inline u64 timens_add_boottime_ns(u64 nsec)

{

	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;



	return nsec + timespec64_to_ns(&ns_offsets->boottime);

}



static inline void timens_sub_boottime(struct timespec64 *ts)

{

	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;



	*ts = timespec64_sub(*ts, ns_offsets->boottime);

}



ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,

				struct timens_offsets *offsets);
@@ -130,6 +144,14 @@ static inline int timens_on_fork(struct nsproxy *nsproxy, 


static inline void timens_add_monotonic(struct timespec64 *ts) { }

static inline void timens_add_boottime(struct timespec64 *ts) { }



static inline u64 timens_add_boottime_ns(u64 nsec)

{

	return nsec;

}



static inline void timens_sub_boottime(struct timespec64 *ts) { }



static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)

{

	return tim;