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timens: add timens_commit() helper

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Wrap the calls to timens_set_vvar_page() and vdso_join_timens() in
timens_on_fork() and timens_install() in a new timens_commit() helper.
We'll use this helper in a follow-up patch in nsproxy too.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Andrei Vagin <avagin@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Dmitry Safonov <dima@arista.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20200706154912.3248030-3-christian.brauner@ubuntu.com
This commit is contained in:
Christian Brauner 2020-07-06 17:49:10 +02:00
parent 42815808f1
commit 5cfea9a106
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 9 additions and 6 deletions
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15
kernel/time/namespace.c
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@ -280,6 +280,12 @@ static void timens_put(struct ns_common *ns)
put_time_ns(to_time_ns(ns));
}
static void timens_commit(struct task_struct *tsk, struct time_namespace *ns)
{
timens_set_vvar_page(tsk, ns);
vdso_join_timens(tsk, ns);
}
static int timens_install(struct nsset *nsset, struct ns_common *new)
{
struct nsproxy *nsproxy = nsset->nsproxy;
@ -292,9 +298,8 @@ static int timens_install(struct nsset *nsset, struct ns_common *new)
!ns_capable(nsset->cred->user_ns, CAP_SYS_ADMIN))
return -EPERM;
timens_set_vvar_page(current, ns);
vdso_join_timens(current, ns);
timens_commit(current, ns);
get_time_ns(ns);
put_time_ns(nsproxy->time_ns);
@ -315,14 +320,12 @@ int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk)
if (nsproxy->time_ns == nsproxy->time_ns_for_children)
return 0;
timens_set_vvar_page(tsk, ns);
vdso_join_timens(tsk, ns);
get_time_ns(ns);
put_time_ns(nsproxy->time_ns);
nsproxy->time_ns = ns;
timens_commit(tsk, ns);
return 0;
}