From: Oleg Nesterov <oleg@redhat.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Louis Rilling <louis.rilling@kerlabs.com>,
Pavel Emelyanov <xemul@openvz.org>,
Linux Containers <containers@lists.osdl.org>,
linux-kernel@vger.kernel.org,
Daniel Lezcano <dlezcano@fr.ibm.com>
Subject: [PATCH 1/2] pid_ns: move destroy_pid_namespace() into workqueue context
Date: Sun, 20 Jun 2010 20:06:10 +0200 [thread overview]
Message-ID: <20100620180610.GC17120@redhat.com> (raw)
In-Reply-To: <20100620180530.GB17120@redhat.com>
A separate patch to simplify the review of the next change.
Move destroy_pid_namespace() into workqueue context. This allows us to do
mntput() from free_pid_ns() paths, see the next patch.
Add the new member, "struct work_struct destroy" into struct pid_namespace
and change free_pid_ns() to call destroy_pid_namespace() via schedule_work().
The patch looks a bit complicated because it also moves copy_pid_ns() up.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
include/linux/pid_namespace.h | 1 +
kernel/pid_namespace.c | 25 +++++++++++++++++--------
2 files changed, 18 insertions(+), 8 deletions(-)
--- 35-rc3/include/linux/pid_namespace.h~PNS_5_DESTROY_FROM_WQ 2009-04-06 00:03:41.000000000 +0200
+++ 35-rc3/include/linux/pid_namespace.h 2010-06-20 17:47:05.000000000 +0200
@@ -24,6 +24,7 @@ struct pid_namespace {
struct kmem_cache *pid_cachep;
unsigned int level;
struct pid_namespace *parent;
+ struct work_struct destroy;
#ifdef CONFIG_PROC_FS
struct vfsmount *proc_mnt;
#endif
--- 35-rc3/kernel/pid_namespace.c~PNS_5_DESTROY_FROM_WQ 2010-06-19 19:21:42.000000000 +0200
+++ 35-rc3/kernel/pid_namespace.c 2010-06-20 18:36:00.000000000 +0200
@@ -114,6 +114,16 @@ out:
return ERR_PTR(err);
}
+struct pid_namespace *copy_pid_ns(unsigned long flags,
+ struct pid_namespace *old_ns)
+{
+ if (!(flags & CLONE_NEWPID))
+ return get_pid_ns(old_ns);
+ if (flags & (CLONE_THREAD|CLONE_PARENT))
+ return ERR_PTR(-EINVAL);
+ return create_pid_namespace(old_ns);
+}
+
static void destroy_pid_namespace(struct pid_namespace *ns)
{
int i;
@@ -123,13 +133,11 @@ static void destroy_pid_namespace(struct
kmem_cache_free(pid_ns_cachep, ns);
}
-struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old_ns)
+static void destroy_pid_namespace_work(struct work_struct *work)
{
- if (!(flags & CLONE_NEWPID))
- return get_pid_ns(old_ns);
- if (flags & (CLONE_THREAD|CLONE_PARENT))
- return ERR_PTR(-EINVAL);
- return create_pid_namespace(old_ns);
+ struct pid_namespace *ns =
+ container_of(work, struct pid_namespace, destroy);
+ destroy_pid_namespace(ns);
}
void free_pid_ns(struct kref *kref)
@@ -137,9 +145,10 @@ void free_pid_ns(struct kref *kref)
struct pid_namespace *ns, *parent;
ns = container_of(kref, struct pid_namespace, kref);
-
parent = ns->parent;
- destroy_pid_namespace(ns);
+
+ INIT_WORK(&ns->destroy, destroy_pid_namespace_work);
+ schedule_work(&ns->destroy);
if (parent != NULL)
put_pid_ns(parent);
next prev parent reply other threads:[~2010-06-20 18:08 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-16 16:34 [PATCH] procfs: Do not release pid_ns->proc_mnt too early Louis Rilling
2010-06-17 9:53 ` Pavel Emelyanov
2010-06-17 13:41 ` Eric W. Biederman
2010-06-17 14:20 ` Louis Rilling
2010-06-17 21:36 ` Oleg Nesterov
2010-06-18 8:27 ` Louis Rilling
2010-06-18 16:27 ` Oleg Nesterov
2010-06-21 11:11 ` Louis Rilling
2010-06-21 12:58 ` Eric W. Biederman
2010-06-21 14:15 ` Louis Rilling
2010-06-21 14:26 ` Eric W. Biederman
2010-06-17 21:20 ` Oleg Nesterov
2010-06-18 8:20 ` Louis Rilling
2010-06-18 11:15 ` Oleg Nesterov
2010-06-18 16:08 ` Oleg Nesterov
2010-06-18 17:33 ` Louis Rilling
2010-06-18 17:55 ` Oleg Nesterov
2010-06-18 21:23 ` Oleg Nesterov
2010-06-19 19:08 ` [PATCH 0/4] pid_ns_prepare_proc/unshare cleanups Oleg Nesterov
2010-06-19 19:09 ` [PATCH 1/4] procfs: proc_get_sb: consolidate/cleanup root_inode->pid logic Oleg Nesterov
2010-06-19 19:10 ` [PATCH 2/4] procfs: kill the global proc_mnt variable Oleg Nesterov
2010-06-19 19:10 ` [PATCH 3/4] procfs: move pid_ns_prepare_proc() from copy_process() to create_pid_namespace() Oleg Nesterov
2010-06-19 19:11 ` [PATCH RESEND 4/4] sys_unshare: simplify the not-really-implemented CLONE_THREAD/SIGHAND/VM code Oleg Nesterov
2010-06-20 8:42 ` [PATCH 0/6] Unshare support for the pid namespace Eric W. Biederman
2010-06-20 8:44 ` [PATCH 1/6] pid: Remove the child_reaper special case in init/main.c Eric W. Biederman
2010-06-20 18:29 ` Oleg Nesterov
2010-06-20 20:27 ` Oleg Nesterov
2010-06-20 8:45 ` [PATCH 2/6] pidns: Call pid_ns_prepare_proc from create_pid_namespace Eric W. Biederman
2010-06-20 18:19 ` Oleg Nesterov
2010-06-20 8:45 ` [PATCH 3/6] procfs: kill the global proc_mnt variable Eric W. Biederman
2010-06-20 8:47 ` [PATCH 4/6] pidns: Don't allow new pids after the namespace is dead Eric W. Biederman
2010-06-20 18:44 ` Oleg Nesterov
2010-06-20 8:48 ` [PATCH 5/6] pidns: Use task_active_pid_ns where appropriate Eric W. Biederman
2010-06-20 8:49 ` [PATCH 6/6] pidns: Support unsharing the pid namespace Eric W. Biederman
2010-06-20 20:14 ` Oleg Nesterov
2010-06-20 20:42 ` Oleg Nesterov
2010-06-21 1:53 ` Eric W. Biederman
2010-06-20 18:03 ` [PATCH 0/6] Unshare support for " Oleg Nesterov
2010-06-20 18:05 ` [PATCH 0/2] pid_ns_release_proc() fixes Oleg Nesterov
2010-06-20 18:06 ` Oleg Nesterov [this message]
2010-06-20 18:06 ` [PATCH 2/2] pid_ns: refactor the buggy pid_ns_release_proc() logic Oleg Nesterov
2010-06-20 21:00 ` [PATCH 0/6] Unshare support for the pid namespace Eric W. Biederman
2010-06-20 21:48 ` Oleg Nesterov
2010-06-20 21:56 ` Oleg Nesterov
2011-01-26 15:57 ` Daniel Lezcano
2010-06-23 20:36 ` [PATCH 0/1] pid_ns: move pid_ns_release_proc() from proc_flush_task() to zap_pid_ns_processes() Oleg Nesterov
2010-06-23 20:37 ` [PATCH 1/1] " Oleg Nesterov
2010-06-24 6:36 ` Sukadev Bhattiprolu
2010-06-24 12:59 ` Oleg Nesterov
2010-06-24 7:06 ` Eric W. Biederman
2010-06-24 13:01 ` Oleg Nesterov
2010-06-24 8:37 ` [PATCH] pid_ns: Fix proc_flush_task() accessing freed proc_mnt Louis Rilling
2010-06-24 17:08 ` [RESEND PATCH] " Louis Rilling
2010-06-24 19:18 ` Oleg Nesterov
2010-06-25 10:23 ` Louis Rilling
2010-06-25 12:21 ` Oleg Nesterov
2010-06-25 18:37 ` Sukadev Bhattiprolu
2010-06-25 19:29 ` Oleg Nesterov
2010-06-25 21:26 ` Sukadev Bhattiprolu
2010-06-25 21:27 ` Oleg Nesterov
2010-06-25 22:07 ` Sukadev Bhattiprolu
2010-07-09 4:36 ` [RFC][PATCH 1/2] pidns: Add a flag to indicate a pid namespace is dead Eric W. Biederman
2010-07-09 4:39 ` [RFC][PATCH 2/2] pidns: Remove proc flush races when a pid namespaces are exiting Eric W. Biederman
2010-07-09 12:14 ` Louis Rilling
2010-07-09 13:05 ` Eric W. Biederman
2010-07-09 14:13 ` Louis Rilling
2010-07-09 15:58 ` [PATCH 01/24] pidns: Remove races by stopping the caching of proc_mnt Eric W. Biederman
2010-07-09 22:13 ` Serge E. Hallyn
2010-07-11 14:14 ` Louis Rilling
2010-07-11 14:25 ` Eric W. Biederman
2010-07-12 18:09 ` [PATCH] pidns: Fix wait for zombies to be reaped in zap_pid_ns_processes Eric W. Biederman
2010-07-13 21:42 ` Louis Rilling
2010-07-13 22:34 ` Serge E. Hallyn
2010-07-14 1:47 ` Eric W. Biederman
2010-10-30 7:07 ` Sukadev Bhattiprolu
2010-07-14 20:53 ` Sukadev Bhattiprolu
2010-07-14 21:35 ` Eric W. Biederman
2010-06-21 11:09 ` [PATCH] procfs: Do not release pid_ns->proc_mnt too early Louis Rilling
2010-06-21 11:15 ` Louis Rilling
2010-06-21 14:38 ` Oleg Nesterov
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