Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752343AbZJMEvL (ORCPT ); Tue, 13 Oct 2009 00:51:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751971AbZJMEvK (ORCPT ); Tue, 13 Oct 2009 00:51:10 -0400 Received: from e6.ny.us.ibm.com ([32.97.182.146]:56334 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751838AbZJMEvI (ORCPT ); Tue, 13 Oct 2009 00:51:08 -0400 Date: Mon, 12 Oct 2009 21:51:42 -0700 From: Sukadev Bhattiprolu To: linux-kernel@vger.kernel.org Cc: Oren Laadan , serue@us.ibm.com, "Eric W. Biederman" , Alexey Dobriyan , Pavel Emelyanov , Andrew Morton , torvalds@linux-foundation.org, mikew@google.com, mingo@elte.hu, hpa@zytor.com, Nathan Lynch , arnd@arndb.de, peterz@infradead.org, Louis.Rilling@kerlabs.com, roland@redhat.com, kosaki.motohiro@jp.fujitsu.com, randy.dunlap@oracle.com, linux-api@vger.kernel.org, Containers , sukadev@us.ibm.com Subject: [RFC][v8][PATCH 5/10]: Add target_pids parameter to alloc_pid() Message-ID: <20091013045142.GE28435@us.ibm.com> References: <20091013044925.GA28181@us.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091013044925.GA28181@us.ibm.com> X-Operating-System: Linux 2.0.32 on an i486 User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3026 Lines: 87 Subject: [RFC][v8][PATCH 5/10]: Add target_pids parameter to alloc_pid() This parameter is currently NULL, but will be used in a follow-on patch. Signed-off-by: Sukadev Bhattiprolu Acked-by: Serge Hallyn Reviewed-by: Oren Laadan --- include/linux/pid.h | 2 +- kernel/fork.c | 3 ++- kernel/pid.c | 9 +++++++-- 3 files changed, 10 insertions(+), 4 deletions(-) Index: linux-2.6/include/linux/pid.h =================================================================== --- linux-2.6.orig/include/linux/pid.h 2009-09-10 10:19:20.000000000 -0700 +++ linux-2.6/include/linux/pid.h 2009-09-10 10:29:10.000000000 -0700 @@ -119,7 +119,7 @@ extern struct pid *find_get_pid(int nr); extern struct pid *find_ge_pid(int nr, struct pid_namespace *); int next_pidmap(struct pid_namespace *pid_ns, int last); -extern struct pid *alloc_pid(struct pid_namespace *ns); +extern struct pid *alloc_pid(struct pid_namespace *ns, pid_t *target_pids); extern void free_pid(struct pid *pid); /* Index: linux-2.6/kernel/fork.c =================================================================== --- linux-2.6.orig/kernel/fork.c 2009-09-10 10:19:20.000000000 -0700 +++ linux-2.6/kernel/fork.c 2009-09-10 10:29:10.000000000 -0700 @@ -940,6 +940,7 @@ static struct task_struct *copy_process( int retval; struct task_struct *p; int cgroup_callbacks_done = 0; + pid_t *target_pids = NULL; if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS)) return ERR_PTR(-EINVAL); @@ -1110,7 +1111,7 @@ static struct task_struct *copy_process( goto bad_fork_cleanup_io; if (pid != &init_struct_pid) { - pid = alloc_pid(p->nsproxy->pid_ns); + pid = alloc_pid(p->nsproxy->pid_ns, target_pids); if (IS_ERR(pid)) { retval = PTR_ERR(pid); goto bad_fork_cleanup_io; Index: linux-2.6/kernel/pid.c =================================================================== --- linux-2.6.orig/kernel/pid.c 2009-09-10 10:23:27.000000000 -0700 +++ linux-2.6/kernel/pid.c 2009-09-10 10:29:10.000000000 -0700 @@ -272,13 +272,14 @@ void free_pid(struct pid *pid) call_rcu(&pid->rcu, delayed_put_pid); } -struct pid *alloc_pid(struct pid_namespace *ns) +struct pid *alloc_pid(struct pid_namespace *ns, pid_t *target_pids) { struct pid *pid; enum pid_type type; int i, nr; struct pid_namespace *tmp; struct upid *upid; + int tpid; pid = kmem_cache_alloc(ns->pid_cachep, GFP_KERNEL); if (!pid) { @@ -288,7 +289,11 @@ struct pid *alloc_pid(struct pid_namespa tmp = ns; for (i = ns->level; i >= 0; i--) { - nr = alloc_pidmap(tmp, 0); + tpid = 0; + if (target_pids) + tpid = target_pids[i]; + + nr = alloc_pidmap(tmp, tpid); if (nr < 0) goto out_free; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/