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ns proc: Add support for the uts namespace

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Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2010-03-07 18:43:27 -08:00
parent 13b6f57623
commit 34482e89a5
3 changed files with 43 additions and 0 deletions
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3
fs/proc/namespaces.c
View File

@ -19,6 +19,9 @@ static const struct proc_ns_operations *ns_entries[] = {
#ifdef CONFIG_NET_NS #ifdef CONFIG_NET_NS
&netns_operations, &netns_operations,
#endif #endif
#ifdef CONFIG_UTS_NS
&utsns_operations,
#endif
}; };
static const struct file_operations ns_file_operations = { static const struct file_operations ns_file_operations = {

1
include/linux/proc_fs.h
View File

@ -266,6 +266,7 @@ struct proc_ns_operations {
int (*install)(struct nsproxy *nsproxy, void *ns); int (*install)(struct nsproxy *nsproxy, void *ns);
}; };
extern const struct proc_ns_operations netns_operations; extern const struct proc_ns_operations netns_operations;
extern const struct proc_ns_operations utsns_operations;
union proc_op { union proc_op {
int (*proc_get_link)(struct inode *, struct path *); int (*proc_get_link)(struct inode *, struct path *);

39
kernel/utsname.c
View File

@ -15,6 +15,7 @@
#include <linux/err.h> #include <linux/err.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/user_namespace.h> #include <linux/user_namespace.h>
#include <linux/proc_fs.h>
static struct uts_namespace *create_uts_ns(void) static struct uts_namespace *create_uts_ns(void)
{ {
@ -79,3 +80,41 @@ void free_uts_ns(struct kref *kref)
put_user_ns(ns->user_ns); put_user_ns(ns->user_ns);
kfree(ns); kfree(ns);
} }
static void *utsns_get(struct task_struct *task)
{
struct uts_namespace *ns = NULL;
struct nsproxy *nsproxy;
rcu_read_lock();
nsproxy = task_nsproxy(task);
if (nsproxy) {
ns = nsproxy->uts_ns;
get_uts_ns(ns);
}
rcu_read_unlock();
return ns;
}
static void utsns_put(void *ns)
{
put_uts_ns(ns);
}
static int utsns_install(struct nsproxy *nsproxy, void *ns)
{
get_uts_ns(ns);
put_uts_ns(nsproxy->uts_ns);
nsproxy->uts_ns = ns;
return 0;
}
const struct proc_ns_operations utsns_operations = {
.name = "uts",
.type = CLONE_NEWUTS,
.get = utsns_get,
.put = utsns_put,
.install = utsns_install,
};