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authorCedric Le Goater <clg@fr.ibm.com>2006-12-08 02:37:59 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 08:28:52 -0800
commit9a575a92db3312a40cdf0b0406d88de88ad9741e (patch)
tree0b789528da13cd31f7fb206f184cfa123cc0ba42 /kernel
parent61a58c6c238cc81f7742b8cc84212cc55fb57747 (diff)
[PATCH] to nsproxy
Add the pid namespace framework to the nsproxy object. The copy of the pid namespace only increases the refcount on the global pid namespace, init_pid_ns, and unshare is not implemented. There is no configuration option to activate or deactivate this feature because this not relevant for the moment. Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Cc: Kirill Korotaev <dev@openvz.org> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/nsproxy.c26
-rw-r--r--kernel/pid.c23
2 files changed, 42 insertions, 7 deletions
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index f223c15c18e9..e2ce748e96af 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -19,6 +19,7 @@
#include <linux/init_task.h>
#include <linux/mnt_namespace.h>
#include <linux/utsname.h>
+#include <linux/pid_namespace.h>
struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
@@ -68,6 +69,8 @@ struct nsproxy *dup_namespaces(struct nsproxy *orig)
get_uts_ns(ns->uts_ns);
if (ns->ipc_ns)
get_ipc_ns(ns->ipc_ns);
+ if (ns->pid_ns)
+ get_pid_ns(ns->pid_ns);
}
return ns;
@@ -111,10 +114,17 @@ int copy_namespaces(int flags, struct task_struct *tsk)
if (err)
goto out_ipc;
+ err = copy_pid_ns(flags, tsk);
+ if (err)
+ goto out_pid;
+
out:
put_nsproxy(old_ns);
return err;
+out_pid:
+ if (new_ns->ipc_ns)
+ put_ipc_ns(new_ns->ipc_ns);
out_ipc:
if (new_ns->uts_ns)
put_uts_ns(new_ns->uts_ns);
@@ -129,11 +139,13 @@ out_ns:
void free_nsproxy(struct nsproxy *ns)
{
- if (ns->mnt_ns)
- put_mnt_ns(ns->mnt_ns);
- if (ns->uts_ns)
- put_uts_ns(ns->uts_ns);
- if (ns->ipc_ns)
- put_ipc_ns(ns->ipc_ns);
- kfree(ns);
+ if (ns->mnt_ns)
+ put_mnt_ns(ns->mnt_ns);
+ if (ns->uts_ns)
+ put_uts_ns(ns->uts_ns);
+ if (ns->ipc_ns)
+ put_ipc_ns(ns->ipc_ns);
+ if (ns->pid_ns)
+ put_pid_ns(ns->pid_ns);
+ kfree(ns);
}
diff --git a/kernel/pid.c b/kernel/pid.c
index 25807e1b98dd..5319b9f2fc5e 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -59,6 +59,9 @@ static inline int mk_pid(struct pid_namespace *pid_ns,
* the scheme scales to up to 4 million PIDs, runtime.
*/
struct pid_namespace init_pid_ns = {
+ .kref = {
+ .refcount = ATOMIC_INIT(2),
+ },
.pidmap = {
[ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
},
@@ -356,6 +359,26 @@ struct pid *find_ge_pid(int nr)
}
EXPORT_SYMBOL_GPL(find_get_pid);
+int copy_pid_ns(int flags, struct task_struct *tsk)
+{
+ struct pid_namespace *old_ns = tsk->nsproxy->pid_ns;
+ int err = 0;
+
+ if (!old_ns)
+ return 0;
+
+ get_pid_ns(old_ns);
+ return err;
+}
+
+void free_pid_ns(struct kref *kref)
+{
+ struct pid_namespace *ns;
+
+ ns = container_of(kref, struct pid_namespace, kref);
+ kfree(ns);
+}
+
/*
* The pid hash table is scaled according to the amount of memory in the
* machine. From a minimum of 16 slots up to 4096 slots at one gigabyte or