From 25b21cb2f6d69b0475b134e0a3e8e269137270fa Mon Sep 17 00:00:00 2001 From: Kirill Korotaev Date: Mon, 2 Oct 2006 02:18:19 -0700 Subject: [PATCH] IPC namespace core This patch set allows to unshare IPCs and have a private set of IPC objects (sem, shm, msg) inside namespace. Basically, it is another building block of containers functionality. This patch implements core IPC namespace changes: - ipc_namespace structure - new config option CONFIG_IPC_NS - adds CLONE_NEWIPC flag - unshare support [clg@fr.ibm.com: small fix for unshare of ipc namespace] [akpm@osdl.org: build fix] Signed-off-by: Pavel Emelianov Signed-off-by: Kirill Korotaev Signed-off-by: Cedric Le Goater Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/nsproxy.c | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-) (limited to 'kernel/nsproxy.c') diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index 8246813335cc..8d6c852dc51e 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -7,6 +7,10 @@ * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. + * + * Jun 2006 - namespaces support + * OpenVZ, SWsoft Inc. + * Pavel Emelianov */ #include @@ -62,6 +66,8 @@ struct nsproxy *dup_namespaces(struct nsproxy *orig) get_namespace(ns->namespace); if (ns->uts_ns) get_uts_ns(ns->uts_ns); + if (ns->ipc_ns) + get_ipc_ns(ns->ipc_ns); } return ns; @@ -82,7 +88,7 @@ int copy_namespaces(int flags, struct task_struct *tsk) get_nsproxy(old_ns); - if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS))) + if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC))) return 0; new_ns = clone_namespaces(old_ns); @@ -94,24 +100,31 @@ int copy_namespaces(int flags, struct task_struct *tsk) tsk->nsproxy = new_ns; err = copy_namespace(flags, tsk); - if (err) { - tsk->nsproxy = old_ns; - put_nsproxy(new_ns); - goto out; - } + if (err) + goto out_ns; err = copy_utsname(flags, tsk); - if (err) { - if (new_ns->namespace) - put_namespace(new_ns->namespace); - tsk->nsproxy = old_ns; - put_nsproxy(new_ns); - goto out; - } + if (err) + goto out_uts; + + err = copy_ipcs(flags, tsk); + if (err) + goto out_ipc; out: put_nsproxy(old_ns); return err; + +out_ipc: + if (new_ns->uts_ns) + put_uts_ns(new_ns->uts_ns); +out_uts: + if (new_ns->namespace) + put_namespace(new_ns->namespace); +out_ns: + tsk->nsproxy = old_ns; + put_nsproxy(new_ns); + goto out; } void free_nsproxy(struct nsproxy *ns) @@ -120,5 +133,7 @@ void free_nsproxy(struct nsproxy *ns) put_namespace(ns->namespace); if (ns->uts_ns) put_uts_ns(ns->uts_ns); + if (ns->ipc_ns) + put_ipc_ns(ns->ipc_ns); kfree(ns); } -- cgit v1.2.1