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[PATCH] IPC namespace core

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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 <xemul@openvz.org>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Kirill Korotaev
2006-10-02 02:18:19 -07:00
committed by Linus Torvalds
parent c0b2fc3165
commit 25b21cb2f6
7 changed files with 95 additions and 17 deletions
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41
kernel/nsproxy.c
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@@ -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 <xemul@openvz.org>
*/
#include <linux/module.h>
@@ -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);
}