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https://github.com/edk2-porting/linux-next.git
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89dd8eecfe
The helper subtracts namespace's clock offset from the given time and ensures that the result is within [0, KTIME_MAX]. 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/20191112012724.250792-13-dima@arista.com
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TIMENS_H
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#define _LINUX_TIMENS_H
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#include <linux/sched.h>
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#include <linux/kref.h>
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#include <linux/nsproxy.h>
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#include <linux/ns_common.h>
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#include <linux/err.h>
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struct user_namespace;
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extern struct user_namespace init_user_ns;
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struct timens_offsets {
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struct timespec64 monotonic;
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struct timespec64 boottime;
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};
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struct time_namespace {
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struct kref kref;
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struct user_namespace *user_ns;
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struct ucounts *ucounts;
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struct ns_common ns;
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struct timens_offsets offsets;
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} __randomize_layout;
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extern struct time_namespace init_time_ns;
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#ifdef CONFIG_TIME_NS
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static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
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{
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kref_get(&ns->kref);
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return ns;
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}
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struct time_namespace *copy_time_ns(unsigned long flags,
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struct user_namespace *user_ns,
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struct time_namespace *old_ns);
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void free_time_ns(struct kref *kref);
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int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);
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static inline void put_time_ns(struct time_namespace *ns)
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{
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kref_put(&ns->kref, free_time_ns);
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}
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static inline void timens_add_monotonic(struct timespec64 *ts)
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{
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struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets;
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*ts = timespec64_add(*ts, ns_offsets->monotonic);
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}
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static inline void timens_add_boottime(struct timespec64 *ts)
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{
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struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets;
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*ts = timespec64_add(*ts, ns_offsets->boottime);
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}
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ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
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struct timens_offsets *offsets);
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static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
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{
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struct time_namespace *ns = current->nsproxy->time_ns;
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if (likely(ns == &init_time_ns))
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return tim;
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return do_timens_ktime_to_host(clockid, tim, &ns->offsets);
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}
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#else
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static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
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{
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return NULL;
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}
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static inline void put_time_ns(struct time_namespace *ns)
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{
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}
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static inline
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struct time_namespace *copy_time_ns(unsigned long flags,
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struct user_namespace *user_ns,
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struct time_namespace *old_ns)
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{
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if (flags & CLONE_NEWTIME)
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return ERR_PTR(-EINVAL);
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return old_ns;
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}
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static inline int timens_on_fork(struct nsproxy *nsproxy,
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struct task_struct *tsk)
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{
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return 0;
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}
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static inline void timens_add_monotonic(struct timespec64 *ts) { }
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static inline void timens_add_boottime(struct timespec64 *ts) { }
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static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
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{
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return tim;
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}
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#endif
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#endif /* _LINUX_TIMENS_H */
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