2 * linux/ipc/namespace.c
3 * Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.
8 #include <linux/ipc_namespace.h>
9 #include <linux/rcupdate.h>
10 #include <linux/nsproxy.h>
11 #include <linux/slab.h>
15 static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
17 struct ipc_namespace *ns;
19 ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
21 return ERR_PTR(-ENOMEM);
23 atomic_inc(&nr_ipc_ns);
33 struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
35 struct ipc_namespace *new_ns;
40 if (!(flags & CLONE_NEWIPC))
43 new_ns = clone_ipc_ns(ns);
50 * free_ipcs - free all ipcs of one type
51 * @ns: the namespace to remove the ipcs from
52 * @ids: the table of ipcs to free
53 * @free: the function called to free each individual ipc
55 * Called for each kind of ipc when an ipc_namespace exits.
57 void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
58 void (*free)(struct ipc_namespace *, struct kern_ipc_perm *))
60 struct kern_ipc_perm *perm;
64 down_write(&ids->rw_mutex);
68 for (total = 0, next_id = 0; total < in_use; next_id++) {
69 perm = idr_find(&ids->ipcs_idr, next_id);
72 ipc_lock_by_ptr(perm);
76 up_write(&ids->rw_mutex);
79 void free_ipc_ns(struct kref *kref)
81 struct ipc_namespace *ns;
83 ns = container_of(kref, struct ipc_namespace, kref);
88 atomic_dec(&nr_ipc_ns);