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time: Add timens_offsets to be used for tasks in time namespace

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Introduce offsets for time namespace. They will contain an adjustment
needed to convert clocks to/from host's.

A new namespace is created with the same offsets as the time namespace
of the current process.

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/20191112012724.250792-5-dima@arista.com
This commit is contained in:
Andrei Vagin 2019-11-12 01:26:53 +00:00 committed by Thomas Gleixner
parent 769071ac9f
commit af993f58d6
2 changed files with 24 additions and 0 deletions
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22
include/linux/time_namespace.h
View file

@ -12,11 +12,17 @@
struct user_namespace;
extern struct user_namespace init_user_ns;
struct timens_offsets {
struct timespec64 monotonic;
struct timespec64 boottime;
};
struct time_namespace {
struct kref kref;
struct user_namespace *user_ns;
struct ucounts *ucounts;
struct ns_common ns;
struct timens_offsets offsets;
} __randomize_layout;
extern struct time_namespace init_time_ns;
@ -39,6 +45,20 @@ static inline void put_time_ns(struct time_namespace *ns)
kref_put(&ns->kref, free_time_ns);
}
static inline void timens_add_monotonic(struct timespec64 *ts)
{
struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
*ts = timespec64_add(*ts, ns_offsets->monotonic);
}
static inline void timens_add_boottime(struct timespec64 *ts)
{
struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
*ts = timespec64_add(*ts, ns_offsets->boottime);
}
#else
static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
@ -66,6 +86,8 @@ static inline int timens_on_fork(struct nsproxy *nsproxy,
return 0;
}
static inline void timens_add_monotonic(struct timespec64 *ts) { }
static inline void timens_add_boottime(struct timespec64 *ts) { }
#endif
#endif /* _LINUX_TIMENS_H */

2
kernel/time/namespace.c
View file

@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/err.h>
#include <linux/mm.h>
static struct ucounts *inc_time_namespaces(struct user_namespace *ns)
{
@ -60,6 +61,7 @@ static struct time_namespace *clone_time_ns(struct user_namespace *user_ns,
ns->ucounts = ucounts;
ns->ns.ops = &timens_operations;
ns->user_ns = get_user_ns(user_ns);
ns->offsets = old_ns->offsets;
return ns;
fail_free: