01b8b07a5d
sem_exit_ns(), msg_exit_ns() and shm_exit_ns() are all called when an ipc_namespace is released to free all ipcs of each type. But in fact, they do the same thing: they loop around all ipcs to free them individually by calling a specific routine. This patch proposes to consolidate this by introducing a common function, free_ipcs(), that do the job. The specific routine to call on each individual ipcs is passed as parameter. For this, these ipc-specific 'free' routines are reworked to take a generic 'struct ipc_perm' as parameter. Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Nadia Derbey <Nadia.Derbey@bull.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/*
|
|
* linux/ipc/namespace.c
|
|
* Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.
|
|
*/
|
|
|
|
#include <linux/ipc.h>
|
|
#include <linux/msg.h>
|
|
#include <linux/ipc_namespace.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "util.h"
|
|
|
|
static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
|
|
{
|
|
struct ipc_namespace *ns;
|
|
|
|
ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
|
|
if (ns == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
sem_init_ns(ns);
|
|
msg_init_ns(ns);
|
|
shm_init_ns(ns);
|
|
|
|
kref_init(&ns->kref);
|
|
return ns;
|
|
}
|
|
|
|
struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
|
|
{
|
|
struct ipc_namespace *new_ns;
|
|
|
|
BUG_ON(!ns);
|
|
get_ipc_ns(ns);
|
|
|
|
if (!(flags & CLONE_NEWIPC))
|
|
return ns;
|
|
|
|
new_ns = clone_ipc_ns(ns);
|
|
|
|
put_ipc_ns(ns);
|
|
return new_ns;
|
|
}
|
|
|
|
/*
|
|
* free_ipcs - free all ipcs of one type
|
|
* @ns: the namespace to remove the ipcs from
|
|
* @ids: the table of ipcs to free
|
|
* @free: the function called to free each individual ipc
|
|
*
|
|
* Called for each kind of ipc when an ipc_namespace exits.
|
|
*/
|
|
void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
|
|
void (*free)(struct ipc_namespace *, struct kern_ipc_perm *))
|
|
{
|
|
struct kern_ipc_perm *perm;
|
|
int next_id;
|
|
int total, in_use;
|
|
|
|
down_write(&ids->rw_mutex);
|
|
|
|
in_use = ids->in_use;
|
|
|
|
for (total = 0, next_id = 0; total < in_use; next_id++) {
|
|
perm = idr_find(&ids->ipcs_idr, next_id);
|
|
if (perm == NULL)
|
|
continue;
|
|
ipc_lock_by_ptr(perm);
|
|
free(ns, perm);
|
|
total++;
|
|
}
|
|
up_write(&ids->rw_mutex);
|
|
}
|
|
|
|
void free_ipc_ns(struct kref *kref)
|
|
{
|
|
struct ipc_namespace *ns;
|
|
|
|
ns = container_of(kref, struct ipc_namespace, kref);
|
|
sem_exit_ns(ns);
|
|
msg_exit_ns(ns);
|
|
shm_exit_ns(ns);
|
|
kfree(ns);
|
|
}
|