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fs/proc: Introduce /proc/pid/timens_offsets

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API to set time namespace offsets for children processes, i.e.:
echo "$clockid $offset_sec $offset_nsec" > /proc/self/timens_offsets

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/20191112012724.250792-28-dima@arista.com
This commit is contained in:
Andrei Vagin
2019-11-12 01:27:16 +00:00
committed by Thomas Gleixner
parent 70ddf65184
commit 04a8682a71
3 changed files with 205 additions and 0 deletions
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10
include/linux/time_namespace.h
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@@ -52,6 +52,16 @@ static inline void put_time_ns(struct time_namespace *ns)
kref_put(&ns->kref, free_time_ns);
}
void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m);
struct proc_timens_offset {
int clockid;
struct timespec64 val;
};
int proc_timens_set_offset(struct file *file, struct task_struct *p,
struct proc_timens_offset *offsets, int n);
static inline void timens_add_monotonic(struct timespec64 *ts)
{
struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;