From: Dmitry Safonov <dima@arista.com>
To: linux-kernel@vger.kernel.org
Cc: Andrei Vagin <avagin@openvz.org>,
Dmitry Safonov <dima@arista.com>, Adrian Reber <adrian@lisas.de>,
Andrei Vagin <avagin@gmail.com>,
Andy Lutomirski <luto@kernel.org>,
Andy Tucker <agtucker@google.com>, Arnd Bergmann <arnd@arndb.de>,
Christian Brauner <christian.brauner@ubuntu.com>,
Cyrill Gorcunov <gorcunov@openvz.org>,
Dmitry Safonov <0x7f454c46@gmail.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
Jeff Dike <jdike@addtoit.com>, Oleg Nesterov <oleg@redhat.com>,
Pavel Emelyanov <xemul@virtuozzo.com>,
Shuah Khan <shuah@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
containers@lists.linux-foundation.org, criu@openvz.org,
linux-api@vger.kernel.org, x86@kernel.org
Subject: [PATCH 02/32] timens: Add timens_offsets
Date: Wed, 6 Feb 2019 00:10:36 +0000 [thread overview]
Message-ID: <20190206001107.16488-3-dima@arista.com> (raw)
In-Reply-To: <20190206001107.16488-1-dima@arista.com>
From: Andrei Vagin <avagin@openvz.org>
Introduce offsets for time namespace. They will contain an adjustment
needed to convert clocks to/from host's.
Allocate one page for each time namespace that will be premapped into
userspace among vvar pages.
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
MAINTAINERS | 1 +
include/linux/time_namespace.h | 1 +
include/linux/timens_offsets.h | 8 ++++++++
kernel/time_namespace.c | 14 ++++++++++++--
4 files changed, 22 insertions(+), 2 deletions(-)
create mode 100644 include/linux/timens_offsets.h
diff --git a/MAINTAINERS b/MAINTAINERS
index e03f160012e3..cc9054a74886 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12145,6 +12145,7 @@ S: Maintained
F: fs/timerfd.c
F: include/linux/timer*
F: include/linux/time_namespace.h
+F: include/linux/timens_offsets.h
F: kernel/time_namespace.c
F: kernel/time/*timer*
diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h
index 9507ed7072fe..b6985aa87479 100644
--- a/include/linux/time_namespace.h
+++ b/include/linux/time_namespace.h
@@ -8,6 +8,7 @@
#include <linux/nsproxy.h>
#include <linux/ns_common.h>
#include <linux/err.h>
+#include <linux/timens_offsets.h>
struct user_namespace;
extern struct user_namespace init_user_ns;
diff --git a/include/linux/timens_offsets.h b/include/linux/timens_offsets.h
new file mode 100644
index 000000000000..7d7cb68ea778
--- /dev/null
+++ b/include/linux/timens_offsets.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_TIME_OFFSETS_H
+#define _LINUX_TIME_OFFSETS_H
+
+struct timens_offsets {
+};
+
+#endif
diff --git a/kernel/time_namespace.c b/kernel/time_namespace.c
index 8c600df9771d..4828447721ec 100644
--- a/kernel/time_namespace.c
+++ b/kernel/time_namespace.c
@@ -13,6 +13,7 @@
#include <linux/user_namespace.h>
#include <linux/proc_ns.h>
#include <linux/sched/task.h>
+#include <linux/mm.h>
static struct ucounts *inc_time_namespaces(struct user_namespace *ns)
{
@@ -46,6 +47,7 @@ static struct time_namespace *clone_time_ns(struct user_namespace *user_ns,
{
struct time_namespace *ns;
struct ucounts *ucounts;
+ struct page *page;
int err;
err = -ENOSPC;
@@ -58,15 +60,22 @@ static struct time_namespace *clone_time_ns(struct user_namespace *user_ns,
if (!ns)
goto fail_dec;
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ goto fail_free;
+ ns->offsets = page_address(page);
+ BUILD_BUG_ON(sizeof(*ns->offsets) > PAGE_SIZE);
+
err = ns_alloc_inum(&ns->ns);
if (err)
- goto fail_free;
+ goto fail_page;
ns->ucounts = ucounts;
ns->ns.ops = &timens_operations;
ns->user_ns = get_user_ns(user_ns);
return ns;
-
+fail_page:
+ free_page((unsigned long)ns->offsets);
fail_free:
kfree(ns);
fail_dec:
@@ -94,6 +103,7 @@ void free_time_ns(struct kref *kref)
struct time_namespace *ns;
ns = container_of(kref, struct time_namespace, kref);
+ free_page((unsigned long)ns->offsets);
dec_time_namespaces(ns->ucounts);
put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns);
--
2.20.1
next prev parent reply other threads:[~2019-02-06 0:14 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-06 0:10 [PATCH 00/32] kernel: Introduce Time Namespace Dmitry Safonov
2019-02-06 0:10 ` [PATCH 01/32] ns: " Dmitry Safonov
2019-02-06 0:10 ` Dmitry Safonov [this message]
2019-02-06 0:10 ` [PATCH 03/32] timens: Introduce CLOCK_MONOTONIC offsets Dmitry Safonov
2019-02-07 21:40 ` Thomas Gleixner
2019-02-08 9:02 ` Andrei Vagin
2019-02-08 9:46 ` Thomas Gleixner
2019-02-06 0:10 ` [PATCH 04/32] timens: Introduce CLOCK_BOOTTIME offset Dmitry Safonov
2019-02-06 0:10 ` [PATCH 05/32] timerfd/timens: Take into account ns clock offsets Dmitry Safonov
2019-02-06 8:52 ` Cyrill Gorcunov
2019-02-06 8:55 ` Cyrill Gorcunov
2019-02-07 6:38 ` Andrei Vagin
2019-02-06 0:10 ` [PATCH 06/32] posix-timers/timens: Take into account " Dmitry Safonov
2019-02-06 0:10 ` [PATCH 07/32] timens/kernel: Take into account timens clock offsets in clock_nanosleep Dmitry Safonov
2019-02-08 7:56 ` Thomas Gleixner
2019-02-06 0:10 ` [PATCH 08/32] timens: Shift /proc/uptime Dmitry Safonov
2019-02-06 0:10 ` [PATCH 09/32] x86/vdso2c: Correct err messages on file opening Dmitry Safonov
2019-02-06 0:10 ` [PATCH 10/32] x86/vdso2c: Convert iterator to unsigned Dmitry Safonov
2019-02-06 0:10 ` [PATCH 11/32] x86/vdso/Makefile: Add vobjs32 Dmitry Safonov
2019-02-06 0:10 ` [PATCH 12/32] x86/vdso/timens: Add offsets page in vvar Dmitry Safonov
2019-02-06 0:10 ` [PATCH 13/32] x86/vdso: Build timens .so(s) Dmitry Safonov
2019-02-06 0:10 ` [PATCH 14/32] x86/VDSO: Build VDSO with -ffunction-sections Dmitry Safonov
2019-02-06 0:10 ` [PATCH 15/32] x86/vdso2c: Optionally produce linker script for vdso entries Dmitry Safonov
2019-02-06 0:10 ` [PATCH 16/32] x86/vdso: Generate vdso{,32}-timens.lds Dmitry Safonov
2019-02-07 8:31 ` Rasmus Villemoes
2019-02-07 16:11 ` Dmitry Safonov
2019-02-08 9:57 ` Thomas Gleixner
2019-02-08 15:18 ` Dmitry Safonov
2019-03-27 18:00 ` Andrei Vagin
2019-03-27 18:06 ` [PATCH RFC] x86/asm: Introduce static_retcall(s) Andrei Vagin
2019-03-27 18:06 ` [PATCH RFC] vdso: introduce timens_static_branch Andrei Vagin
2019-02-06 0:10 ` [PATCH 17/32] x86/vdso2c: Sort vdso entries by addresses for linker script Dmitry Safonov
2019-02-06 0:10 ` [PATCH 18/32] x86/vdso.lds: Align !timens (host's) vdso.so entries Dmitry Safonov
2019-02-06 0:10 ` [PATCH 19/32] x86/vdso2c: Align LOCAL symbols between vdso{-timens,}.so Dmitry Safonov
2019-02-06 0:10 ` [PATCH 20/32] x86/vdso: Initialize timens 64-bit vdso Dmitry Safonov
2019-02-06 0:10 ` [PATCH 21/32] x86/vdso: Switch image on setns()/unshare()/clone() Dmitry Safonov
2019-02-06 0:10 ` [PATCH 22/32] timens: Add align for timens_offsets Dmitry Safonov
2019-02-06 0:10 ` [PATCH 23/32] timens/fs/proc: Introduce /proc/pid/timens_offsets Dmitry Safonov
2019-02-06 0:10 ` [PATCH 24/32] selftest/timens: Add Time Namespace test for supported clocks Dmitry Safonov
2019-02-06 0:10 ` [PATCH 25/32] selftest/timens: Add a test for timerfd Dmitry Safonov
2019-02-06 0:11 ` [PATCH 26/32] selftest/timens: Add a test for clock_nanosleep() Dmitry Safonov
2019-02-06 0:11 ` [PATCH 27/32] selftest/timens: Add procfs selftest Dmitry Safonov
2019-02-06 0:11 ` [PATCH 28/32] selftest/timens: Add timer offsets test Dmitry Safonov
2019-02-06 0:11 ` [PATCH 29/32] selftests: Add a simple perf test for clock_gettime() Dmitry Safonov
2019-02-06 0:11 ` [PATCH 30/32] selftest/timens: Check that a right vdso is mapped after fork and exec Dmitry Safonov
2019-02-06 0:11 ` [PATCH 31/32] x86/vdso: Align VDSO functions by CPU L1 cache line Dmitry Safonov
2019-02-06 0:11 ` [PATCH 32/32] x86/vdso: Restrict splitting VVAR VMA Dmitry Safonov
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